/* ==================== CSS RESET & BASE ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    overflow-x: hidden;
    max-width: 100%;
}

:root {
    /* Tokyo Night Palette - Storm/Night Variant */
    --bg-primary: #1a1b26;
    --bg-secondary: #24283b;
    --bg-tertiary: #414868;

    /* Accent Colors (Neon) */
    --accent-primary: #bb9af7;    /* Purple */
    --accent-secondary: #7dcfff;  /* Cyan */
    --accent-gradient: linear-gradient(135deg, #bb9af7, #7dcfff);
    --button-active-gradient: linear-gradient(135deg, #7aa2f7, #7dcfff);

    /* State Colors */
    --color-on: #9ece6a;          /* Success Green */
    --color-off: #f7768e;         /* Error Red */
    --color-wire-on: #7aa2f7;      /* Blue Glow */
    --color-wire-off: #565f89;     /* Muted Steel */

    /* Text Colors */
    --text-primary: #c0caf5;
    --text-secondary: #a9b1d6;
    --text-muted: #565f89;

    /* Glass Effect Refined */
    --glass-bg: rgba(36, 40, 59, 0.7);
    --glass-border: rgba(187, 154, 247, 0.15);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius - Sharper for Tokyo Night */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

body {
    font-family: 'Alexandria', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 30%, rgba(187, 154, 247, 0.1), transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(122, 162, 247, 0.1), transparent 50%),
        #1a1b26;
    z-index: -1;
    animation: backgroundPulse 12s ease-in-out infinite;
}

@keyframes backgroundPulse {

    0%,
    100% {
        opacity: 0.5;
    }

    50% {
        opacity: 0.8;
    }
}

/* ==================== LAYOUT ==================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    width: 100%;
}

/* ==================== HEADER ==================== */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
}

.title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    animation: titleSlideIn 0.8s ease-out;
    filter: drop-shadow(0 0 15px rgba(187, 154, 247, 0.5));
}

@keyframes titleSlideIn {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 300;
    animation: subtitleFadeIn 1s ease-out 0.3s both;
}

@keyframes subtitleFadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.creator-credit {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 300;
    margin-top: var(--spacing-xs);
    animation: subtitleFadeIn 1s ease-out 0.5s both;
}

/* ==================== GLASS CARD ==================== */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    border-color: rgba(187, 154, 247, 0.4);
    box-shadow: 0 0 20px rgba(187, 154, 247, 0.2);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    direction: rtl;
}

.section-title::before {
    content: '';
    width: 4px;
    height: 24px;
    background: var(--accent-gradient);
    border-radius: 2px;
    box-shadow: 0 0 10px var(--accent-primary);
}

/* ==================== MAIN CONTENT ==================== */
.main-content {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: 1fr;
}

/* ==================== TAB NAVIGATION (SLIDER STYLE) ==================== */
.radio-group {
    display: flex;
    gap: 0;
    background: rgba(36, 40, 59, 0.6); /* bg-secondary */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 6px;
    border-radius: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(187, 154, 247, 0.2);
    position: relative;
    width: 100%;
    max-width: 750px;
    height: 56px;
    margin: 0 auto var(--spacing-lg) auto;
}

/* Base slider (Indicator) */
.slider {
    position: absolute;
    top: 6px;
    bottom: 6px;
    background: rgba(187, 154, 247, 0.15);
    border: 1px solid #bb9af7;
    border-radius: 24px;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    box-shadow: 0 0 15px rgba(187, 154, 247, 0.3);
    z-index: 0;
}

.radio-option {
    position: relative;
    z-index: 1;
    flex: 1;
}

.radio-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.radio-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 100%;
    padding: 0 16px;
    color: var(--text-muted); /* #565f89 */
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
    border-radius: 24px;
    position: relative;
    white-space: nowrap;
}

.radio-option input[type="radio"]:checked + .radio-label {
    color: #c0caf5; /* Bright text for active */
    text-shadow: 0 0 8px rgba(192, 202, 245, 0.5);
}

.radio-label:hover {
    color: var(--text-primary); /* #c0caf5 */
}

/* Hover glow effect */
.radio-label::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.05);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.radio-label:hover::before {
    opacity: 1;
}

/* RTL Automatic Slider Adjustment */
.radio-group:has(#tab-gates:checked) .slider {
    right: 6px;
    width: calc(33.333% - 4px);
}

.radio-group:has(#tab-converter:checked) .slider {
    right: calc(33.333% + 2px);
    width: calc(33.333% - 4px);
}

.radio-group:has(#tab-quiz:checked) .slider {
    right: calc(66.666% - 2px);
    width: calc(33.333% - 4px);
}


.tab-icon {
    font-size: 1.2rem;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: grid;
}

/* ==================== CONVERTER PANEL ==================== */
.converter-layout {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    align-items: start;
}

.converter-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.converter-label {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'Alexandria', sans-serif;
    direction: rtl;
}

.base-select {
    width: 100%;
    background: #24283b;
    border: 1px solid #414868;
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.base-select:focus {
    outline: none;
    border-color: #bb9af7;
    box-shadow: 0 0 0 3px rgba(187, 154, 247, 0.2);
}

.base-select:hover {
    border-color: var(--accent-secondary);
}

.swap-container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 2rem;
}

.swap-btn {
    background: #24283b;
    border: 2px solid var(--glass-border);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    color: var(--text-secondary);
    font-size: 1.5rem;
}

.swap-btn:hover {
    background: var(--button-active-gradient);
    border-color: transparent;
    color: white;
    transform: rotate(180deg) scale(1.1);
    box-shadow: 0 4px 16px rgba(122, 162, 247, 0.4);
}

.swap-icon {
    font-weight: bold;
}

.result-display {
    background: var(--bg-primary);
    border: 2px solid var(--accent-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-value {
    font-size: 1.3rem;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
    color: var(--color-on);
    word-break: break-all;
}

.number-input {
    width: 100%;
    background: #24283b;
    border: 1px solid #414868;
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.2rem;
    transition: all var(--transition-normal);
}

.number-input:focus {
    outline: none;
    border-color: #bb9af7;
    box-shadow: 0 0 10px rgba(187, 154, 247, 0.2);
}

.number-input::placeholder {
    color: var(--text-muted);
}

.input-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

.convert-btn {
    background: var(--button-active-gradient);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.2rem;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin: 0 auto;
    font-family: inherit;
    box-shadow: 0 4px 16px hsla(190, 85%, 55%, 0.4);
}

.convert-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(122, 162, 247, 0.6);
}

.convert-btn:active {
    transform: translateY(0);
}

.btn-icon {
    font-size: 1.5rem;
}

/* ==================== STEPS PANEL ==================== */
.steps-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.step-card {
    background: #24283b;
    border-left: 4px solid var(--accent-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
}

.step-card:hover {
    background: var(--bg-secondary);
    transform: translateX(-4px);
}

.step-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-sm);
    font-family: 'JetBrains Mono', monospace;
}

.step-formula {
    font-size: 1.1rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-primary);
    background: var(--bg-primary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    margin: var(--spacing-sm) 0;
    overflow-x: auto;
}

.step-explanation {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    direction: rtl;
}

.step-result {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-on);
    margin-top: var(--spacing-sm);
    font-family: 'JetBrains Mono', monospace;
}

/* Visual Mapping Styles */
.visual-mapping {
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
    text-align: center;
}

.binary-row,
.arrow-row,
.power-row {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin: var(--spacing-xs) 0;
}

.binary-digit {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-primary);
    font-family: 'JetBrains Mono', monospace;
    min-width: 40px;
    display: inline-block;
}

.arrow {
    font-size: 1.5rem;
    color: var(--color-on);
    min-width: 40px;
    display: inline-block;
}

.power-label {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    min-width: 40px;
    display: inline-block;
    background: #24283b;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
}

.decimal-point {
    color: var(--color-on);
    font-size: 2.5rem;
}

/* Division Steps Styles */
.division-steps {
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
}

.division-row {
    font-size: 1.1rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-primary);
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--glass-border);
}

.division-row:last-child {
    border-bottom: none;
}

.remainder {
    color: var(--accent-primary);
    font-weight: 700;
    margin-left: var(--spacing-sm);
}

.step-num {
    color: var(--color-on);
    font-weight: 700;
    margin-right: var(--spacing-xs);
}

.remainder-hint {
    display: block;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
    margin-left: var(--spacing-lg);
    font-style: italic;
}

/* ==================== REFERENCE PANEL ==================== */
.reference-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.reference-card {
    background: #24283b;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
}

.reference-card:hover {
    background: var(--bg-secondary);
    transform: translateY(-4px);
    box-shadow: 0 8px 20px hsla(280, 85%, 65%, 0.3);
}

.reference-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-sm);
    font-family: 'JetBrains Mono', monospace;
}

.formula {
    font-size: 1rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-primary);
    background: var(--bg-primary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    margin: var(--spacing-xs) 0;
    text-align: center;
}

.example {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    line-height: 1.6;
}

/* ==================== MAIN CONTENT ====================

/* ==================== GATE SELECTOR ==================== */
.gate-group {
    margin-bottom: var(--spacing-lg);
}

.gate-group:last-child {
    margin-bottom: 0;
}

.gate-group-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--glass-border);
    font-family: 'Alexandria', 'Inter', sans-serif;
    direction: rtl;
}

.gate-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-sm);
}

.gate-btn {
    background: #24283b;
    border: 1px solid #414868;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: inherit;
    color: var(--text-secondary);
}

.gate-btn:hover {
    background: #2f334d;
    border-color: #7dcfff;
    box-shadow: 0 0 15px rgba(125, 207, 255, 0.3);
}

.gate-btn.active {
    background: rgba(125, 207, 255, 0.1);
    border-color: #7dcfff;
    color: #7dcfff;
    box-shadow: 0 0 20px rgba(125, 207, 255, 0.4);
}

.gate-icon-svg {
    width: 60px;
    height: 40px;
    color: var(--text-secondary);
    transition: all var(--transition-normal);
}

.gate-btn:hover .gate-icon-svg {
    color: var(--accent-primary);
}

.gate-btn.active .gate-icon-svg {
    color: white;
}

.gate-name {
    font-size: 0.9rem;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
}

/* ==================== SIMULATOR PANEL ==================== */
.simulator-content {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    padding: var(--spacing-lg) 0;
}

/* ==================== INPUT CONTROLS ==================== */
.inputs-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.input-control {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: flex-start;
}

.input-label {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

/* ==================== TOGGLE BUTTON ==================== */
.toggle-btn {
    width: 80px;
    height: 40px;
    background: #24283b;
    border: 1px solid #414868;
    border-radius: 20px;
    position: relative;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-btn:hover {
    transform: scale(1.05);
}

.toggle-slider {
    position: absolute;
    top: 4px;
    left: 4px;
    width: 30px;
    height: 30px;
    background: #565f89;
    border-radius: 50%;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.toggle-value {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-weight: 700;
    font-size: 0.9rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-secondary);
    transition: color var(--transition-normal);
    pointer-events: none;
    z-index: 1;
}

.toggle-btn[data-state="1"] {
    background: rgba(158, 206, 106, 0.2);
    border-color: #9ece6a;
    box-shadow: 0 0 15px rgba(158, 206, 106, 0.3);
}

.toggle-btn[data-state="1"] .toggle-slider {
    left: calc(100% - 34px);
    background: #9ece6a;
    box-shadow: 0 0 10px #9ece6a;
}

.toggle-btn[data-state="1"] .toggle-value {
    color: var(--color-on);
    text-shadow: 0 0 6px var(--color-on);
}

/* ==================== WIRES ==================== */
.wire {
    width: 100%;
    height: 6px;
    background: var(--color-wire-off);
    border-radius: 3px;
    position: relative;
    transition: all var(--transition-normal);
}

.wire[data-state="1"] {
    background: var(--color-wire-on);
    box-shadow:
        0 0 10px var(--color-wire-on),
        0 0 20px var(--color-wire-on);
    animation: wirePulse 1.5s ease-in-out infinite;
}

@keyframes wirePulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.wire-a,
.wire-b {
    margin-top: var(--spacing-xs);
}

.wire-output {
    margin-bottom: var(--spacing-xs);
}

/* ==================== GATE DISPLAY ==================== */
.gate-display {
    display: flex;
    justify-content: center;
    align-items: center;
}

.gate-box {
    background: #24283b;
    border: 2px solid #bb9af7;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    min-width: 200px;
    text-align: center;
    box-shadow: 0 0 20px rgba(187, 154, 247, 0.2);
    transition: all var(--transition-normal);
}

.gate-box:hover {
    transform: scale(1.02);
    box-shadow: 0 0 30px rgba(187, 154, 247, 0.4);
}

.gate-svg {
    width: 180px;
    height: 120px;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-sm);
    filter: drop-shadow(0 4px 12px rgba(187, 154, 247, 0.3));
    transition: all var(--transition-normal);
}

.gate-box:hover .gate-svg {
    filter: drop-shadow(0 6px 16px rgba(187, 154, 247, 0.5));
}

.gate-name-display {
    font-size: 1.2rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.gate-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
    direction: rtl;
    text-align: center;
}

/* ==================== OUTPUT SECTION ==================== */
.output-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: flex-end;
}

.output-display {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: flex-end;
}

.output-label {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

.output-value {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: #1a1b26;
    border: 2px solid var(--color-off);
    transition: all var(--transition-normal);
}

.output-value[data-state="1"] {
    border-color: var(--color-on);
    background: rgba(158, 206, 106, 0.1);
    box-shadow: 0 0 25px var(--color-on);
}

.value-text {
    font-size: 2.5rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    color: var(--color-off);
    transition: all var(--transition-normal);
}

.output-value[data-state="1"] .value-text {
    color: var(--color-on);
    text-shadow: 0 0 10px var(--color-on);
}

/* ==================== TRUTH TABLE ==================== */
.table-container {
    overflow-x: auto;
}

.truth-table {
    width: 100%;
    border-collapse: collapse;
    font-family: 'JetBrains Mono', monospace;
}

.truth-table th,
.truth-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: center;
    border: 1px solid var(--glass-border);
}

.truth-table th {
    background: var(--accent-gradient);
    color: white;
    font-weight: 600;
    font-size: 1.1rem;
}

.truth-table tbody tr {
    background: #24283b;
    transition: all var(--transition-fast);
}

.truth-table tbody tr:hover {
    background: var(--bg-secondary);
}

.truth-table tbody tr.active-row {
    background: rgba(187, 154, 247, 0.2);
    border: 2px solid var(--accent-primary);
}

.truth-table td {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* ==================== FOOTER ==================== */
.footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.95rem;
}

.footer p {
    margin-bottom: var(--spacing-sm);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: #24283b;
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-normal);
    font-family: 'JetBrains Mono', monospace;
}

.social-link:hover {
    background: var(--button-active-gradient);
    border-color: transparent;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(122, 162, 247, 0.4);
}

.social-icon {
    width: 20px;
    height: 20px;
}

/* ==================== RESPONSIVE DESIGN ==================== */

/* Ultra-wide screens (1920px+) */
@media (min-width: 1920px) {
    .container {
        max-width: 1600px;
    }

    .title {
        font-size: 4.5rem;
    }

    .subtitle {
        font-size: 1.4rem;
    }
}

/* Large tablets and small desktops (1024px - 1440px) */
@media (max-width: 1440px) and (min-width: 1024px) {
    .container {
        max-width: 1200px;
    }
}

/* Tablets (768px - 1024px) */
@media (max-width: 1024px) {
    .container {
        padding: var(--spacing-md);
    }

    .simulator-content {
        grid-template-columns: minmax(0, 1fr);
        gap: var(--spacing-xl);
        text-align: center;
    }

    .inputs-section {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }

    .input-control {
        align-items: center;
        min-width: 120px;
    }

    .output-section {
        align-items: center;
    }

    /* Hide wires on mobile to save space */
    .wire-a,
    .wire-b,
    .wire-output {
        display: none !important;
    }

    .gate-svg {
        width: clamp(100px, 20vw, 150px);
        height: auto;
    }
}

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-sm);
    }

    .header {
        margin-bottom: var(--spacing-lg);
        padding: var(--spacing-md) 0;
    }

    .title {
        font-size: clamp(1.8rem, 8vw, 2.8rem);
    }

    .subtitle {
        font-size: 1rem;
        padding: 0 var(--spacing-sm);
    }

    .section-title {
        font-size: 1.25rem;
    }

    .tab-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 1rem;
    }

    .tab-icon {
        font-size: 1.2rem;
    }

    .converter-layout {
        grid-template-columns: 1fr;
    }

    .swap-container {
        padding-top: 0;
        order: 3;
    }

    .swap-btn {
        transform: rotate(90deg);
    }

    .swap-btn:hover {
        transform: rotate(270deg) scale(1.1);
    }

    .reference-grid {
        grid-template-columns: 1fr;
    }

    .gate-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xs);
    }

    .gate-btn {
        padding: var(--spacing-sm);
    }

    .gate-icon-svg {
        width: 50px;
        height: 35px;
    }

    .gate-name {
        font-size: 0.8rem;
    }

    .gate-box {
        min-width: 150px;
        padding: var(--spacing-md);
    }

    .gate-svg {
        width: 130px;
        height: 90px;
    }

    .gate-name-display {
        font-size: 1rem;
    }

    .gate-description {
        font-size: 0.8rem;
    }
}

@media (max-width: 640px) {
    .container {
        padding: var(--spacing-sm);
    }

    .gate-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .inputs-section {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }

    .input-control {
        align-items: center;
        width: 100%;
    }

    .output-display {
        align-items: center;
    }

    .glass-card {
        padding: var(--spacing-md);
    }

    .truth-table th,
    .truth-table td {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.9rem;
    }

    .truth-table th {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-xs);
    }

    .header {
        margin-bottom: var(--spacing-sm);
    }

    .title {
        font-size: clamp(1.5rem, 9vw, 2.2rem);
        margin-bottom: 0.2rem;
    }

    .subtitle {
        font-size: 0.85rem;
        line-height: 1.4;
    }

    .glass-card {
        padding: var(--spacing-sm);
        border-radius: var(--radius-md);
    }

    .section-title {
        font-size: 1.1rem;
        gap: 0.5rem;
    }

    .section-title::before {
        width: 3px;
        height: 18px;
    }

    /* Tab Navigation Mobile */
    .radio-group {
        height: 170px; /* 3 tabs * 50px + 20px padding/gaps */
        flex-direction: column;
        border-radius: 20px;
        padding: 6px;
        max-width: 100%;
        margin-bottom: var(--spacing-md);
    }

    
    .radio-label {
        height: 100%;
        border-radius: 14px;
    }
    
    /* On mobile columns, slider adjusts vertically */
    .slider {
        border-radius: 14px;
        left: 6px !important;
        right: 6px !important;
        width: auto !important;
        height: calc(33.333% - 4px);
    }

    .radio-group:has(#tab-gates:checked) .slider {
        top: 6px;
    }

    .radio-group:has(#tab-converter:checked) .slider {
        top: calc(33.333% + 2px);
    }

    .radio-group:has(#tab-quiz:checked) .slider {
        top: calc(66.666% - 2px);
    }

    /* Converter Mobile - Full width inputs */
    .converter-layout {
        grid-template-columns: minmax(0, 1fr);
        gap: var(--spacing-sm);
    }

    .base-select, 
    .number-input {
        font-size: 1rem;
        padding: 0.8rem;
        min-height: 48px;
    }

    .swap-container {
        padding: 0.5rem 0;
        order: 1; /* Keep swap in middle if possible, but simplest is below */
    }

    .swap-btn {
        width: 44px;
        height: 44px;
    }

    .result-value {
        font-size: 1.1rem;
    }

    .convert-btn {
        width: 100%;
        height: 52px;
        font-size: 1.1rem;
        margin-top: 0.5rem;
    }

    /* Simulator Elements */
    .simulator-content {
        gap: var(--spacing-md);
        padding: var(--spacing-sm) 0;
    }

    .inputs-section {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 1rem;
    }

    .input-control {
        flex: 1;
        min-width: 140px;
    }

    .gate-box {
        min-width: unset;
        width: 100%;
        padding: 1.5rem 1rem;
    }

    .gate-svg {
        width: 120px;
        height: 80px;
    }

    .output-value {
        width: 100%;
        max-width: 120px;
        height: 60px;
    }

    .value-text {
        font-size: 2rem;
    }

    /* Table Responsiveness - More Compact */
    .truth-table-panel.glass-card {
        padding: 0.8rem 0.5rem;
    }

    .truth-table {
        display: table; /* Revert to table for better alignment */
        width: 100%;
        border-spacing: 0;
    }

    .truth-table th,
    .truth-table td {
        padding: 0.5rem 0.4rem;
        font-size: 0.85rem;
    }

    .table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        margin: 0 -0.5rem; /* Negative margin to peek out of card slightly */
        padding: 0 0.5rem;
    }
}

/* Very small devices (iPhone SE) */
@media (max-width: 320px) {
    .title { font-size: 1.4rem; }
    .gate-grid { grid-template-columns: 1fr; }
    .inputs-section { flex-direction: column; }
    .input-control { width: 100%; }
}

/* Extra-small screens (under 360px) */
@media (max-width: 360px) {
    .title {
        font-size: clamp(1.3rem, 12vw, 2rem);
    }

    .subtitle {
        font-size: 0.8rem;
    }

    .tab-btn {
        padding: 0.4rem 0.5rem;
        font-size: 0.8rem;
    }

    .tab-icon {
        font-size: 1rem;
    }

    .tab-label {
        font-size: 0.75rem;
    }

    .gate-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.3rem;
    }

    .gate-btn {
        padding: 0.5rem;
    }

    .gate-icon-svg {
        width: 40px;
        height: 25px;
    }

    .gate-name {
        font-size: 0.7rem;
    }

    .number-input {
        font-size: 1rem;
        padding: 0.6rem;
    }

    .convert-btn {
        font-size: 1rem;
        padding: var(--spacing-xs) var(--spacing-md);
    }

    .binary-digit {
        font-size: 1.3rem;
        min-width: 25px;
    }

    .arrow {
        font-size: 1rem;
        min-width: 25px;
    }

    .power-label {
        font-size: 0.75rem;
        min-width: 25px;
    }

    .section-title {
        font-size: 1rem;
    }

    .footer {
        font-size: 0.8rem;
    }

    .social-link {
        font-size: 0.8rem;
        padding: 0.3rem 0.5rem;
    }
}

/* ==================== ANIMATIONS ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.glass-card {
    animation: fadeIn 0.6s ease-out both;
}

.gate-selector-panel {
    animation-delay: 0.1s;
}

.simulator-panel {
    animation-delay: 0.2s;
}

.truth-table-panel {
    animation-delay: 0.3s;
}

/* ==================== STRATEGY MAP (MOBILE RESPONSIVE) ==================== */
.strategy-container {
    background: rgba(245, 158, 11, 0.1);
    border: 2px solid #fbbf24;
    border-radius: 16px;
    padding: 2rem;
    position: relative;
    text-align: center;
}

.strategy-label {
    position: absolute;
    top: -14px;
    right: 50%;
    transform: translateX(50%);
    background: #fbbf24;
    color: #000;
    padding: 4px 16px;
    border-radius: 8px;
    font-weight: bold;
    font-size: 0.9rem;
    white-space: nowrap;
}

.strategy-description {
    color: #cbd5e1;
    margin-bottom: 2rem;
    font-size: 1rem;
}

.strategy-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.strategy-step {
    flex: 1;
    min-width: 120px;
}

.step-header {
    color: #fff;
    margin-bottom: 15px;
    font-size: 1.1rem;
    font-weight: bold;
}

.step-card {
    background: #1e293b;
    color: #94a3b8;
    padding: 12px;
    border-radius: 12px;
    border: 1px dashed #475569;
    position: relative;
    font-weight: 500;
}

.step-action {
    position: absolute;
    bottom: -25px;
    left: 0;
    right: 0;
    font-size: 0.8rem;
    font-weight: bold;
}

.step-card.start .step-action {
    color: #4ade80;
}

.step-card.end .step-action {
    color: #f87171;
}

.strategy-arrow {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 60px;
}

.arrow-icon {
    font-size: 2rem;
    color: #4ade80;
}

.arrow-red {
    color: #f87171;
}

.strategy-bridge {
    flex: 1;
    min-width: 140px;
    background: #fbbf24;
    color: #000;
    padding: 1.5rem 1rem;
    border-radius: 16px;
    font-weight: bold;
    box-shadow: 0 4px 20px rgba(251, 191, 36, 0.4);
    transform: scale(1.1);
    z-index: 10;
}

.bridge-title {
    font-size: 1.4rem;
    margin-bottom: 4px;
}

.bridge-subtitle {
    font-size: 0.8rem;
    opacity: 0.8;
}

.strategy-summary {
    margin-top: 3rem;
    background: rgba(15, 23, 42, 0.5);
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    text-align: right;
    direction: rtl;
}

.summary-title {
    color: #fbbf24;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.summary-text {
    color: #94a3b8;
    font-size: 0.9rem;
    line-height: 1.6;
}

/* MOBILE RESPONSIVENESS */
@media (max-width: 768px) {
    .strategy-container {
        padding: 1.5rem 1rem;
    }

    .strategy-flow {
        flex-direction: column;
        gap: 2.5rem;
        /* More gap for vertical layout */
    }

    .strategy-step,
    .strategy-bridge {
        width: 100%;
        /* Full width on mobile */
        min-width: auto;
        transform: none !important;
        /* Reset scale for bridge */
    }

    .strategy-arrow {
        transform: rotate(90deg);
        /* Point Down */
        margin: -10px 0;
        /* Tighten spacing around arrows */
    }

    .step-action {
        bottom: -22px;
    }

    .strategy-summary {
        text-align: center;
        direction: rtl;
    }
}

/* ==================== QUIZ STYLES ==================== */

/* Quiz Header */
.quiz-header {
    text-align: center;
}

.quiz-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    direction: rtl;
}

.quiz-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: #24283b;
    border-radius: var(--radius-md);
    min-width: 120px;
    border: 2px solid var(--glass-border);
    transition: all var(--transition-normal);
}

.stat-item:hover {
    transform: translateY(-4px);
    border-color: var(--accent-primary);
    box-shadow: 0 8px 20px hsla(280, 85%, 65%, 0.3);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-family: 'Alexandria', sans-serif;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-primary);
    font-family: 'JetBrains Mono', monospace;
}

.stat-total {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

/* Quiz Question Panel */
.quiz-question-panel {
    position: relative;
}

/* Unified Quiz Question Display */
.question-content-centered {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.gate-display-quiz {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-xl);
    /* Connected look */
    padding: var(--spacing-xl);
    background: #24283b;
    border-radius: var(--radius-xl);
    border: 2px solid var(--glass-border);
    position: relative;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.gate-svg-quiz {
    width: 200px;
    height: 150px;
    filter: drop-shadow(0 0 10px hsla(280, 85%, 65%, 0.3));
}

.gate-name-quiz {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
}

@media (max-width: 768px) {
    .gate-display-quiz {
        flex-direction: row;
        padding: var(--spacing-md);
        gap: var(--spacing-md);
        justify-content: center;
    }
}

.gate-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    z-index: 2;
}

.required-output-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    z-index: 2;
    padding-left: var(--spacing-md);
    border-left: 2px dashed var(--glass-border);
    /* Subtle separation or remove if wanting pure wire */
    margin-left: 0;
}

/* Override previous if distinct separation isn't wanted, but wire does the job */
.required-output-container {
    border: none;
    padding-left: 0;
}

.output-label-quiz {
    font-size: 1rem;
    color: var(--text-secondary);
    font-family: 'Alexandria', sans-serif;
    margin-bottom: var(--spacing-xs);
}

.required-output h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    font-family: 'Alexandria', sans-serif;
    direction: rtl;
}

.output-display-quiz {
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #24283b;
    border: 4px solid var(--color-on);
    border-radius: 50%;
    box-shadow:
        0 0 20px var(--color-on),
        0 0 40px hsla(140, 70%, 55%, 0.3),
        inset 0 0 20px hsla(140, 70%, 55%, 0.2);
    animation: outputPulse 2s ease-in-out infinite;
}

@keyframes outputPulse {

    0%,
    100% {
        transform: scale(1);
        box-shadow:
            0 0 20px var(--color-on),
            0 0 40px hsla(140, 70%, 55%, 0.3),
            inset 0 0 20px hsla(140, 70%, 55%, 0.2);
    }

    50% {
        transform: scale(1.05);
        box-shadow:
            0 0 30px var(--color-on),
            0 0 60px hsla(140, 70%, 55%, 0.5),
            inset 0 0 30px hsla(140, 70%, 55%, 0.3);
    }
}

.output-value-large {
    font-size: 4rem;
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    color: var(--color-on);
    text-shadow: 0 0 20px var(--color-on);
}

/* Quiz Interactive Area */
.quiz-interactive-area {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: #24283b;
    border-radius: var(--radius-md);
    border: 2px solid var(--glass-border);
}

.inputs-drag-area {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.input-drop-zone {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.drop-zone-label {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

.drop-zone-box {
    min-height: 100px;
    background: var(--bg-primary);
    border: 3px dashed var(--glass-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    position: relative;
}

.drop-zone-box.drag-over {
    border-color: var(--accent-primary);
    background: hsla(280, 85%, 65%, 0.1);
    border-style: solid;
    transform: scale(1.02);
    box-shadow: 0 0 20px hsla(280, 85%, 65%, 0.3);
}

.drop-placeholder {
    font-size: 1rem;
    color: var(--text-muted);
    font-family: 'Alexandria', sans-serif;
}

.drop-zone-box[data-value="0"] .drop-placeholder,
.drop-zone-box[data-value="1"] .drop-placeholder {
    display: none;
}

/* Draggable Switches */
.draggable-switches {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.draggable-switches h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    font-family: 'Alexandria', sans-serif;
    direction: rtl;
    text-align: center;
}

.switches-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.draggable-switch {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.draggable-switch:hover {
    transform: translateY(-4px) scale(1.05);
    border-color: var(--accent-secondary);
    box-shadow: 0 8px 20px hsla(200, 90%, 55%, 0.3);
}

.draggable-switch:active {
    cursor: pointer;
    transform: scale(0.95);
}

.draggable-switch.dragging {
    opacity: 0.5;
    transform: scale(0.9);
}

.draggable-switch.used {
    opacity: 0.3;
    pointer-events: none;
    filter: grayscale(1);
}

.switch-visual {
    width: 80px;
    height: 40px;
    background: #24283b;
    border-radius: 20px;
    position: relative;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.switch-visual.off {
    border: 2px solid var(--color-off);
}

.switch-visual.on {
    border: 2px solid var(--color-on);
}

.switch-toggle {
    position: absolute;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    top: 4px;
    transition: all var(--transition-normal);
}

.switch-visual.off .switch-toggle {
    left: 6px;
    background: var(--color-off);
}

.switch-visual.on .switch-toggle {
    right: 6px;
    background: var(--color-on);
    box-shadow: 0 0 10px var(--color-on);
}

.switch-label {
    font-size: 1rem;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-secondary);
}

/* Selected State for Switch */
.draggable-switch.selected {
    border-color: var(--accent-primary);
    background: hsla(280, 85%, 65%, 0.1);
    box-shadow: 0 0 15px hsla(280, 85%, 65%, 0.4);
    transform: scale(1.05);
}

/* Target Animation for Drop Zones when Selection is Active */
.quiz-interactive-area.selection-active .drop-zone-box {
    animation: targetPulse 1.5s infinite;
    cursor: pointer;
    border-color: var(--accent-primary) !important;
    background: hsla(280, 85%, 65%, 0.05);
}

.quiz-interactive-area.selection-active .drop-zone-box:hover {
    background: hsla(280, 85%, 65%, 0.15);
    box-shadow: 0 0 20px hsla(280, 85%, 65%, 0.4);
}

@keyframes targetPulse {
    0% {
        border-color: var(--glass-border);
        box-shadow: 0 0 0 transparent;
    }

    50% {
        border-color: var(--accent-primary);
        box-shadow: 0 0 15px hsla(280, 85%, 65%, 0.3);
    }

    100% {
        border-color: var(--glass-border);
        box-shadow: 0 0 0 transparent;
    }
}

/* Dropped Switch in Zone */
.dropped-switch {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    animation: dropIn 0.3s ease-out;
}

@keyframes dropIn {
    from {
        opacity: 0;
        transform: scale(0.5) rotate(10deg);
    }

    to {
        opacity: 1;
        transform: scale(1) rotate(0deg);
    }
}

/* Submit Button */
.submit-answer-btn {
    background: var(--button-active-gradient);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.3rem;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin: 0 auto;
    font-family: 'Alexandria', sans-serif;
    box-shadow: 0 4px 16px hsla(190, 85%, 55%, 0.4);
    min-width: 250px;
}

.submit-answer-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px hsla(190, 85%, 55%, 0.6);
}

.submit-answer-btn:active:not(:disabled) {
    transform: translateY(0);
}

.submit-answer-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Feedback Section */
/* Feedback Modal Overlay */
.feedback-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-lg);
    animation: fadeIn 0.3s ease-out;
}

.feedback-modal {
    width: 100%;
    max-width: 500px;
    background: #24283b;
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    animation: popupScale 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    text-align: center;
}

@keyframes popupScale {
    from {
        transform: scale(0.8);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.feedback-content {
    margin-bottom: var(--spacing-lg);
}

.feedback-correct {
    padding: var(--spacing-lg);
    background: hsla(140, 70%, 55%, 0.1);
    border: 2px solid var(--color-on);
    border-radius: var(--radius-md);
    text-align: center;
}

.feedback-correct .feedback-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
}

.feedback-correct .feedback-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-on);
    margin-bottom: var(--spacing-sm);
    font-family: 'Alexandria', sans-serif;
}

.feedback-correct .feedback-message {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-family: 'Alexandria', sans-serif;
    direction: rtl;
}

.feedback-wrong {
    padding: var(--spacing-lg);
    background: hsla(0, 70%, 55%, 0.1);
    border: 2px solid hsl(0, 70%, 55%);
    border-radius: var(--radius-md);
}

.feedback-wrong .feedback-icon {
    font-size: 4rem;
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.feedback-wrong .feedback-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: hsl(0, 70%, 55%);
    margin-bottom: var(--spacing-sm);
    font-family: 'Alexandria', sans-serif;
    text-align: center;
}

.feedback-wrong .feedback-message {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-family: 'Alexandria', sans-serif;
    direction: rtl;
    text-align: center;
}

.correct-answer-display {
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
}

.correct-answer-display h4 {
    font-size: 1.2rem;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-sm);
    font-family: 'Alexandria', sans-serif;
    direction: rtl;
    text-align: center;
}

.correct-inputs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.correct-input-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.correct-input-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

.correct-input-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-on);
    font-family: 'JetBrains Mono', monospace;
}

/* Next Question Button */
.next-question-btn {
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.2rem;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin: 0 auto;
    font-family: 'Alexandria', sans-serif;
    box-shadow: 0 4px 16px hsla(280, 85%, 65%, 0.4);
}

.next-question-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px hsla(280, 85%, 65%, 0.6);
}

.next-question-btn:active {
    transform: translateY(0);
}

/* Quiz Results */
.quiz-results {
    text-align: center;
}

.results-summary {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
    flex-wrap: wrap;
}

.result-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: #24283b;
    border-radius: var(--radius-md);
    min-width: 150px;
    border: 2px solid var(--glass-border);
    transition: all var(--transition-normal);
}

.result-stat:hover {
    transform: translateY(-4px) scale(1.05);
    border-color: var(--accent-primary);
    box-shadow: 0 8px 20px hsla(280, 85%, 65%, 0.3);
}

.result-icon {
    font-size: 3rem;
}

.result-label {
    font-size: 1rem;
    color: var(--text-muted);
    font-family: 'Alexandria', sans-serif;
}

.result-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    font-family: 'JetBrains Mono', monospace;
}

.performance-message {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: #24283b;
    border-radius: var(--radius-md);
    font-family: 'Alexandria', sans-serif;
    direction: rtl;
}

.restart-quiz-btn {
    background: var(--button-active-gradient);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.3rem;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin: 0 auto;
    font-family: 'Alexandria', sans-serif;
    box-shadow: 0 4px 16px hsla(190, 85%, 55%, 0.4);
}

.restart-quiz-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px hsla(190, 85%, 55%, 0.6);
}

.restart-quiz-btn:active {
    transform: translateY(0);
}

/* Responsive Design for Quiz */
@media (max-width: 768px) {
    .question-content {
        grid-template-columns: 1fr;
    }

    .quiz-interactive-area {
        grid-template-columns: 1fr;
    }

    .quiz-stats {
        gap: var(--spacing-md);
    }

    .stat-item {
        min-width: 100px;
    }

    .switches-container {
        grid-template-columns: 1fr 1fr;
    }

    .results-summary {
        gap: var(--spacing-md);
    }
}

/* Shake Animation for Errors */
@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    20% {
        transform: translateX(-10px);
    }

    40% {
        transform: translateX(10px);
    }

    60% {
        transform: translateX(-5px);
    }

    80% {
        transform: translateX(5px);
    }
}

.shake {
    animation: shake 0.5s cubic-bezier(.36, .07, .19, .97) both;
    border-color: #ef4444 !important;
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.4) !important;
}

/* Steps Table for Conversion */
.steps-table-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
    overflow-x: auto;
}

.steps-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
}

.steps-table th {
    background: var(--bg-secondary);
    padding: var(--spacing-sm);
    text-align: center;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--glass-border);
    font-family: 'Alexandria', sans-serif;
}

.steps-table td {
    padding: var(--spacing-sm);
    text-align: center;
    border-bottom: 1px solid var(--glass-border);
    direction: ltr;
    /* Numbers look better LTR */
}

.steps-table tr:last-child td {
    border-bottom: none;
}

.highlight-integer {
    color: var(--color-on);
    font-weight: 700;
    background: hsla(140, 70%, 55%, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid hsla(140, 70%, 55%, 0.3);
}

.read-arrow-vertical {
    font-size: 2rem;
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    height: 100%;
    padding: 0 var(--spacing-sm);
    border-left: 2px dashed var(--glass-border);
}

/* ==================== MOBILE RESPONSIVE OPTIMIZATIONS ==================== */

@media (max-width: 768px) {
    .steps-table-container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .steps-table {
        font-size: 0.85rem;
    }

    .steps-table th,
    .steps-table td {
        padding: var(--spacing-xs);
        font-size: 0.8rem;
    }

    .read-arrow-vertical {
        font-size: 1.5rem;
        border-left: none;
        border-top: 2px dashed var(--glass-border);
        padding: var(--spacing-xs) 0;
        width: 100%;
        justify-content: center;
    }

    .gate-svg-quiz {
        width: 150px;
        height: 112px;
    }

    .switches-container {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 1.8rem;
    }

    .tab-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.85rem;
    }

    .steps-table {
        font-size: 0.75rem;
    }

    .steps-table th,
    .steps-table td {
        padding: 4px;
        font-size: 0.7rem;
    }

    .gate-svg-quiz {
        width: 120px;
        height: 90px;
    }

    .switches-container {
        grid-template-columns: 1fr;
    }

    .quiz-actions {
        flex-direction: column;
    }

    .quiz-actions button {
        width: 100%;
    }
}

@media (hover: none) and (pointer: coarse) {

    .tab-btn,
    .gate-btn,
    button {
        min-height: 44px;
    }

    .draggable-switch {
        min-height: 60px;
    }

    .draggable-switch,
    .drop-zone-box {
        -webkit-user-select: none;
        user-select: none;
    }
}

/* ==================== QUIZ MOBILE OPTIMIZATIONS ==================== */

@media (max-width: 768px) {

    /* Compact quiz layout */
    .quiz-question-panel {
        padding: var(--spacing-sm);
    }

    .question-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }

    .gate-display-quiz {
        padding: var(--spacing-md);
    }

    .gate-svg-quiz {
        width: 100px;
        height: 75px;
    }

    .gate-name-quiz {
        font-size: 1rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .output-label-quiz {
        font-size: 0.85rem;
    }

    /* Compact output display */
    .output-display-quiz {
        width: 60px;
        height: 60px;
        border-width: 2px;
    }

    .output-value-large {
        font-size: 2rem;
    }

    .required-output h3 {
        font-size: 1rem;
    }

    /* Compact interactive area */
    .quiz-interactive-area {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }

    .inputs-drag-area {
        gap: var(--spacing-md);
    }

    .drop-zone-box {
        min-height: 70px;
        padding: var(--spacing-sm);
    }

    .drop-zone-label {
        font-size: 0.95rem;
    }

    /* Compact switches */
    .draggable-switches h3 {
        font-size: 1rem;
        margin-bottom: var(--spacing-xs);
    }

    .switches-container {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-sm);
    }

    .draggable-switch {
        padding: var(--spacing-sm);
    }

    .switch-visual {
        width: 60px;
        height: 30px;
    }

    .switch-toggle {
        width: 22px;
        height: 22px;
        top: 2px;
    }

    .switch-visual.off .switch-toggle {
        left: 4px;
    }

    .switch-visual.on .switch-toggle {
        right: 4px;
    }

    .switch-label {
        font-size: 0.85rem;
    }

    /* Compact stats */
    .quiz-stats {
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-md);
    }

    .stat-item {
        padding: var(--spacing-sm);
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .stat-label {
        font-size: 0.8rem;
    }

    /* Compact feedback */
    /* Compact feedback modal */
    .feedback-modal {
        padding: var(--spacing-md);
        width: 90%;
        max-width: 350px;
    }

    .feedback-icon {
        font-size: 2rem;
    }

    .feedback-title {
        font-size: 1.2rem;
    }

    .feedback-message {
        font-size: 0.9rem;
    }

    /* Compact actions */
    .quiz-actions {
        gap: var(--spacing-sm);
        margin-top: var(--spacing-md);
    }

    .quiz-actions button {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {

    /* Ultra compact for small phones */
    .quiz-stats {
        flex-direction: row;
        justify-content: space-around;
    }

    .stat-item {
        min-width: 70px;
        padding: var(--spacing-xs);
    }

    .stat-value {
        font-size: 1.3rem;
    }

    .stat-label {
        font-size: 0.7rem;
    }

    .gate-svg-quiz {
        width: 100px;
        height: 75px;
    }

    .output-display-quiz {
        width: 70px;
        height: 70px;
    }

    .output-value-large {
        font-size: 2rem;
    }

    .drop-zone-box {
        min-height: 60px;
    }

    .switches-container {
        grid-template-columns: 1fr 1fr;
    }

    .switch-visual {
        width: 50px;
        height: 25px;
    }

    .switch-toggle {
        width: 18px;
        height: 18px;
    }
}

/* Optimize for very small screens */
@media (max-width: 360px) {
    .quiz-question-panel {
        padding: var(--spacing-xs);
    }

    .question-content,
    .quiz-interactive-area {
        gap: var(--spacing-sm);
        padding: var(--spacing-sm);
    }

    .gate-svg-quiz {
        width: 80px;
        height: 60px;
    }

    .switches-container {
        grid-template-columns: 1fr;
    }
}


/* ==================== UIVERSE VAULT TOGGLE ==================== */
.ux-vault-toggle {
    --color-slate-base: #24283b;
    --color-slate-dark: #1a1b26;
    --color-slate-light: #414868;
    --color-amber: #f7768e;
    --color-emerald: #9ece6a;
    --color-text-dim: #565f89;
    --track-w: 140px;
    --track-h: 60px;
    --thumb-size: 50px;
    display: inline-block;
    position: relative;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.ux-vault-toggle__input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.ux-vault-toggle__wrapper {
    width: var(--track-w);
    height: var(--track-h);
    position: relative;
    border-radius: 40px;
    background: var(--color-slate-base);
    box-shadow: 0 0 0 2px var(--color-slate-dark), 0 8px 24px rgba(0, 0, 0, 0.6);
    isolation: isolate;
}

.ux-vault-toggle__filter {
    position: absolute;
    pointer-events: none;
}

.ux-vault-toggle__track {
    position: absolute;
    inset: 2px;
    border-radius: 38px;
    background: var(--color-slate-dark);
    box-shadow: inset 0 8px 16px rgba(0, 0, 0, 0.9), inset 0 3px 6px rgba(0, 0, 0, 0.7), inset 0 -2px 4px rgba(255, 255, 255, 0.03);
    overflow: hidden;
    display: flex;
    align-items: center;
}

.ux-vault-toggle__texture {
    position: absolute;
    inset: 0;
    background: var(--color-slate-dark);
    filter: url(#ux-metal-noise);
    opacity: 0.6;
    mix-blend-mode: overlay;
    pointer-events: none;
}

.ux-vault-toggle__circuit {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    will-change: opacity;
}

.ux-circuit-path {
    fill: none;
    stroke-width: 2;
    stroke-dasharray: 100;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.6s cubic-bezier(0.65, 0, 0.35, 1), opacity 0.4s ease;
}

.ux-circuit--off {
    stroke: var(--color-amber);
    stroke-dashoffset: 0;
    opacity: 0.8;
    visibility: visible;
}

.ux-circuit--on {
    stroke: var(--color-emerald);
    stroke-dashoffset: 105;
    opacity: 0;
    visibility: hidden;
}

.ux-vault-toggle__status {
    position: absolute;
    font-family: system-ui, -apple-system, sans-serif;
    font-weight: 800;
    font-size: 14px;
    letter-spacing: 2px;
    display: flex;
    z-index: 2;
}

.ux-vault-toggle__status span {
    display: inline-block;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.4s ease, color 0.4s ease;
    transition-delay: calc(var(--i) * 0.05s);
}

.ux-vault-toggle__status--off {
    right: 24px;
    color: var(--color-amber);
    text-shadow: 0 0 8px rgba(247, 118, 142, 0.4);
}

.ux-vault-toggle__status--on {
    left: 24px;
    color: var(--color-emerald);
    text-shadow: 0 0 8px rgba(158, 206, 106, 0.4);
}

.ux-vault-toggle__status--on span {
    opacity: 0;
    transform: translateY(15px) scale(0.8);
    color: var(--color-text-dim);
}

.ux-vault-toggle__thumb {
    position: absolute;
    top: 5px;
    left: 5px;
    width: var(--thumb-size);
    height: var(--thumb-size);
    border-radius: 50%;
    background: linear-gradient(145deg, var(--color-slate-light), var(--color-slate-base));
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.6), 0 4px 8px rgba(0, 0, 0, 0.5), inset 0 2px 4px rgba(255, 255, 255, 0.15), inset 0 -3px 6px rgba(0, 0, 0, 0.5);
    z-index: 3;
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.ux-vault-toggle__thumb-ring {
    position: absolute;
    inset: 2px;
    border-radius: 50%;
    background: linear-gradient(to bottom, #3a3f46, #1a1d21);
    box-shadow: inset 0 2px 3px rgba(0, 0, 0, 0.8);
    z-index: 1;
}

.ux-vault-toggle__thumb-core {
    position: absolute;
    inset: 8px;
    border-radius: 50%;
    background: var(--color-slate-dark);
    border: 2px solid var(--color-amber);
    box-shadow: inset 0 0 10px rgba(247, 118, 142, 0.3), 0 0 15px rgba(247, 118, 142, 0.4);
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.6s ease, box-shadow 0.6s ease;
}

.ux-thumb-value {
    font-family: 'Alexandria', sans-serif;
    font-size: 20px;
    font-weight: 800;
    color: var(--color-amber);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.ux-thumb-value::before {
    content: "0";
}

.ux-vault-toggle__thumb-glare {
    position: absolute;
    top: 2px;
    left: 10%;
    width: 80%;
    height: 40%;
    border-radius: 50%;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.15), transparent);
    z-index: 4;
    pointer-events: none;
}

.ux-vault-toggle__input:checked ~ .ux-vault-toggle__wrapper .ux-vault-toggle__thumb {
    transform: translateX(80px);
}

.ux-vault-toggle__input:checked ~ .ux-vault-toggle__wrapper .ux-vault-toggle__thumb-core {
    border-color: var(--color-emerald);
    box-shadow: inset 0 0 12px rgba(158, 206, 106, 0.4), 0 0 20px rgba(158, 206, 106, 0.5);
}

.ux-vault-toggle__input:checked ~ .ux-vault-toggle__wrapper .ux-thumb-value {
    color: var(--color-emerald);
    transform: rotate(360deg);
}

.ux-vault-toggle__input:checked ~ .ux-vault-toggle__wrapper .ux-thumb-value::before {
    content: "1";
}

.ux-vault-toggle__input:checked ~ .ux-vault-toggle__wrapper .ux-circuit--off {
    stroke-dashoffset: -105;
    opacity: 0;
    visibility: hidden;
}

.ux-vault-toggle__input:checked ~ .ux-vault-toggle__wrapper .ux-circuit--on {
    stroke-dashoffset: 0;
    opacity: 0.8;
    visibility: visible;
}

.ux-vault-toggle__input:checked ~ .ux-vault-toggle__wrapper .ux-vault-toggle__status--off span {
    opacity: 0;
    transform: translateY(-15px) scale(0.8);
    color: var(--color-text-dim);
}

.ux-vault-toggle__input:checked ~ .ux-vault-toggle__wrapper .ux-vault-toggle__status--on span {
    opacity: 1;
    transform: translateY(0) scale(1);
    color: var(--color-emerald);
}

.ux-vault-toggle:hover .ux-vault-toggle__thumb-core {
    box-shadow: inset 0 0 15px rgba(247, 118, 142, 0.5), 0 0 25px rgba(247, 118, 142, 0.6);
}

.ux-vault-toggle__input:checked:hover ~ .ux-vault-toggle__wrapper .ux-vault-toggle__thumb-core {
    box-shadow: inset 0 0 15px rgba(158, 206, 106, 0.6), 0 0 25px rgba(158, 206, 106, 0.7);
}

.ux-vault-toggle:active .ux-vault-toggle__thumb {
    transform: scale(0.95);
}

.ux-vault-toggle__input:checked:active ~ .ux-vault-toggle__wrapper .ux-vault-toggle__thumb {
    transform: translateX(80px) scale(0.95);
}

/* ==================== ACCESSIBILITY UTILITIES ==================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ==================== END OF TOKYO NIGHT STYLES ==================== */