/* ========== CSS Reset & Variables ========== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary: #6C5CE7;
    --primary-light: #a29bfe;
    --primary-dark: #4834d4;
    --accent: #00cec9;
    --accent-light: #81ecec;
    --secondary: #fd79a8;
    --secondary-light: #fab1d0;
    --success: #00b894;
    --warning: #fdcb6e;
    --danger: #e17055;
    --info: #74b9ff;

    /* Dark Theme */
    --bg-primary: #0a0a1a;
    --bg-secondary: #12122a;
    --bg-card: rgba(25, 25, 60, 0.7);
    --bg-card-hover: rgba(35, 35, 80, 0.8);
    --bg-glass: rgba(255, 255, 255, 0.04);
    --bg-glass-strong: rgba(255, 255, 255, 0.08);

    --text-primary: #e8e8f0;
    --text-secondary: #a0a0c0;
    --text-muted: #6a6a90;

    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(108, 92, 231, 0.3);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(108, 92, 231, 0.2);

    --sidebar-width: 280px;
    --topbar-height: 64px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== Base ========== */
html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Background gradient */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse 80% 50% at 20% 20%, rgba(108, 92, 231, 0.12) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(0, 206, 201, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse 50% 50% at 50% 50%, rgba(253, 121, 168, 0.05) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Outfit', 'Inter', sans-serif;
    font-weight: 700;
    line-height: 1.3;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* ========== Sidebar ========== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: var(--transition);
    backdrop-filter: blur(20px);
}

.sidebar-header {
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 28px;
    filter: drop-shadow(0 0 8px rgba(108, 92, 231, 0.5));
}

.logo-text {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 1.2rem;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-close {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 28px;
    cursor: pointer;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    transition: var(--transition);
}

.sidebar-close:hover {
    background: var(--bg-glass-strong);
    color: var(--text-primary);
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    overflow-y: auto;
}

.sidebar-nav li {
    margin-bottom: 4px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.92rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 100%;
    background: var(--primary);
    border-radius: 0 3px 3px 0;
    transform: scaleY(0);
    transition: var(--transition);
}

.nav-link:hover {
    background: var(--bg-glass-strong);
    color: var(--text-primary);
}

.nav-link.active {
    background: linear-gradient(135deg, rgba(108, 92, 231, 0.15), rgba(0, 206, 201, 0.08));
    color: var(--primary-light);
    font-weight: 600;
}

.nav-link.active::before {
    transform: scaleY(1);
}

.nav-icon {
    font-size: 1.2rem;
    width: 28px;
    text-align: center;
    flex-shrink: 0;
}

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.sidebar-sub {
    margin-top: 4px;
    font-size: 0.7rem;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 999;
}

/* ========== Main Content ========== */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

/* ========== Top Bar ========== */
.topbar {
    position: sticky;
    top: 0;
    height: var(--topbar-height);
    background: rgba(10, 10, 26, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 32px;
    z-index: 100;
    gap: 16px;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.menu-toggle:hover {
    background: var(--bg-glass-strong);
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.topbar-title {
    font-size: 1.15rem;
    font-weight: 600;
    flex: 1;
    letter-spacing: -0.02em;
}

.topbar-badges {
    display: flex;
    gap: 8px;
}

.badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.badge-meb {
    background: linear-gradient(135deg, rgba(108, 92, 231, 0.2), rgba(108, 92, 231, 0.1));
    color: var(--primary-light);
    border: 1px solid rgba(108, 92, 231, 0.3);
}

.badge-unicef {
    background: linear-gradient(135deg, rgba(0, 206, 201, 0.2), rgba(0, 206, 201, 0.1));
    color: var(--accent-light);
    border: 1px solid rgba(0, 206, 201, 0.3);
}

/* ========== Content Sections ========== */
.content-section {
    display: none;
    padding: 32px;
    max-width: 1000px;
    margin: 0 auto;
    animation: fadeIn 0.5s ease;
}

.content-section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(16px);
    }

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

/* ========== Hero Section ========== */
.section-hero {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 28px 28px;
    background: linear-gradient(135deg, rgba(108, 92, 231, 0.1), rgba(0, 206, 201, 0.05));
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    margin-bottom: 32px;
    position: relative;
    overflow: hidden;
}

.section-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(108, 92, 231, 0.1), transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-content {
    flex: 1;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--bg-glass-strong);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 16px;
    letter-spacing: 0.05em;
}

.hero-title {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 8px;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-light), var(--accent), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 480px;
}

.hero-visual {
    flex-shrink: 0;
    z-index: 1;
}

.hero-visual canvas {
    border-radius: var(--radius-lg);
    filter: drop-shadow(0 0 20px rgba(108, 92, 231, 0.15));
}

/* ========== Info Grid ========== */
.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 32px;
}

.info-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.info-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-glow);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.info-card-icon {
    font-size: 2rem;
    margin-bottom: 12px;
    filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.1));
}

.info-card h3 {
    font-size: 1.15rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.info-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.info-card ul {
    padding-left: 0;
}

.info-card ul li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.88rem;
}

.info-card ul li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary-light);
    font-weight: 700;
}

.warning-card {
    border-color: rgba(253, 203, 110, 0.2);
}

.warning-box {
    margin-top: 12px;
    padding: 16px;
    background: rgba(253, 203, 110, 0.08);
    border: 1px solid rgba(253, 203, 110, 0.2);
    border-radius: var(--radius-md);
    color: var(--warning);
    font-size: 0.85rem;
    line-height: 1.6;
}

.safety-card {
    border-color: rgba(225, 112, 85, 0.2);
}

/* ========== Apps Overview ========== */
.apps-overview {
    margin-bottom: 32px;
}

.section-subtitle {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    position: relative;
    padding-left: 16px;
}

.section-subtitle::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 4px;
    background: linear-gradient(180deg, var(--primary), var(--accent));
    border-radius: 2px;
}

.apps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.app-preview-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.app-preview-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transition: var(--transition);
}

.app-preview-card:hover::before {
    transform: scaleX(1);
}

.app-preview-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-glow);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.app-number {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 50%;
    font-weight: 800;
    font-size: 1.2rem;
    margin-bottom: 16px;
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

.app-preview-card h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.app-preview-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.5;
}

.app-duration {
    font-size: 0.78rem;
    color: var(--accent);
    font-weight: 600;
}

/* ========== Section Header ========== */
.section-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.section-number {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: var(--radius-md);
    font-weight: 800;
    font-size: 1.5rem;
    box-shadow: 0 4px 20px rgba(108, 92, 231, 0.3);
    flex-shrink: 0;
}

.section-number.deep {
    background: linear-gradient(135deg, var(--secondary), var(--primary));
    font-size: 1.8rem;
}

.section-header h2 {
    font-size: 1.6rem;
    letter-spacing: -0.02em;
}

.section-meta {
    display: flex;
    gap: 16px;
    margin-top: 6px;
}

.meta-item {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ========== Skills Bar ========== */
.skills-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

.skill-tag {
    padding: 6px 16px;
    background: var(--bg-glass-strong);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.skill-tag:hover {
    border-color: var(--primary-light);
    color: var(--primary-light);
    background: rgba(108, 92, 231, 0.1);
}

/* ========== Content Card ========== */
.content-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-bottom: 20px;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.content-card:hover {
    border-color: rgba(255, 255, 255, 0.12);
}

.content-card h3 {
    font-size: 1.15rem;
    margin-bottom: 14px;
    color: var(--text-primary);
}

.content-card p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.7;
}

.highlight-card {
    border-color: rgba(108, 92, 231, 0.2);
    background: linear-gradient(135deg, rgba(108, 92, 231, 0.06), rgba(0, 206, 201, 0.03));
}

.interactive-card {
    border-color: rgba(0, 206, 201, 0.2);
    background: linear-gradient(135deg, rgba(0, 206, 201, 0.04), rgba(108, 92, 231, 0.02));
}

.assessment-card {
    border-color: rgba(253, 121, 168, 0.2);
    background: linear-gradient(135deg, rgba(253, 121, 168, 0.04), rgba(108, 92, 231, 0.02));
}

/* ========== Hanging Demo ========== */
.hanging-demo-card {
    border-color: rgba(253, 203, 110, 0.25);
    background: linear-gradient(135deg, rgba(253, 203, 110, 0.05), rgba(108, 92, 231, 0.03));
}

.hanging-tabs {
    display: flex;
    gap: 8px;
    margin: 18px 0 20px;
    flex-wrap: wrap;
}

.hanging-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.88rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
    flex: 1;
    justify-content: center;
}

.hanging-tab:hover {
    background: var(--bg-glass-strong);
    border-color: rgba(253, 203, 110, 0.3);
    color: var(--text-primary);
}

.hanging-tab.active {
    background: linear-gradient(135deg, rgba(253, 203, 110, 0.15), rgba(108, 92, 231, 0.1));
    border-color: rgba(253, 203, 110, 0.5);
    color: #fdcb6e;
    box-shadow: 0 0 16px rgba(253, 203, 110, 0.12);
}

.tab-icon {
    font-size: 1.1rem;
}

.hanging-canvas-wrapper {
    position: relative;
}

.hanging-panel {
    display: none;
    animation: fadeIn 0.4s ease;
}

.hanging-panel.active {
    display: block;
}

.hanging-info {
    text-align: center;
    padding: 10px 16px;
    margin: 8px 0 4px;
    background: var(--bg-glass);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hanging-step-label {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--accent);
    letter-spacing: 0.01em;
}

/* ========== Steps List ========== */
.steps-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.step-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 16px;
    background: var(--bg-glass);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.step-item:hover {
    background: var(--bg-glass-strong);
    border-color: rgba(108, 92, 231, 0.15);
}

.step-num {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(108, 92, 231, 0.3);
}

.step-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ========== Expandable ========== */
.expandable {
    margin-top: 16px;
}

.expand-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-glass-strong);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 10px 20px;
    color: var(--primary-light);
    font-weight: 600;
    font-size: 0.88rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
    width: 100%;
    justify-content: center;
}

.expand-btn:hover {
    background: rgba(108, 92, 231, 0.15);
    border-color: var(--primary-light);
}

.expand-icon {
    font-size: 0.7rem;
    transition: transform 0.3s ease;
}

.expandable.open .expand-icon {
    transform: rotate(180deg);
}

.expand-content {
    display: none;
    margin-top: 16px;
    padding: 20px;
    background: var(--bg-glass);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    animation: slideDown 0.3s ease;
}

.expandable.open .expand-content {
    display: block;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }

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

.expand-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 8px;
}

.question-highlight {
    color: var(--accent) !important;
    font-weight: 600;
    font-style: italic;
}

.mt-1 {
    margin-top: 12px;
}

/* ========== Canvas ========== */
.canvas-container {
    display: flex;
    justify-content: center;
    margin: 20px 0;
    padding: 16px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.canvas-container canvas {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    cursor: pointer;
}

.canvas-controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 16px;
}

.interactive-desc {
    color: var(--text-secondary) !important;
    font-size: 0.88rem !important;
    text-align: center;
    font-style: italic;
}

/* ========== Buttons ========== */
.btn {
    padding: 10px 24px;
    border-radius: var(--radius-md);
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 0.85rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.02em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(108, 92, 231, 0.4);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent), #0abab5);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 206, 201, 0.3);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 206, 201, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary), #e84393);
    color: white;
    box-shadow: 0 4px 15px rgba(253, 121, 168, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(253, 121, 168, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background: var(--bg-glass-strong);
    color: var(--text-primary);
    border-color: var(--text-muted);
}

/* ========== Ratio / Measurement Display ========== */
.ratio-display,
.measurement-display {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
    margin: 16px 0;
}

.ratio-item,
.measure-item {
    background: var(--bg-glass-strong);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px 22px;
    text-align: center;
    min-width: 140px;
    transition: var(--transition);
}

.ratio-item:hover,
.measure-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-glow);
}

.ratio-label,
.measure-label {
    display: block;
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ratio-value,
.measure-value {
    display: block;
    font-size: 1.3rem;
    font-weight: 800;
    font-family: 'Outfit', sans-serif;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.measure-item.equals {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: auto;
    padding: 14px 10px;
    background: none;
    border: none;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent);
}

/* ========== Quiz / Assessment ========== */
.question-box {
    padding: 4px;
}

.question-box h4 {
    font-size: 1.05rem;
    color: var(--secondary-light);
    margin-bottom: 16px;
}

.question-content {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    margin-bottom: 20px;
}

.question-text {
    flex: 1;
}

.question-text p {
    margin-bottom: 8px;
}

.question-figure {
    flex-shrink: 0;
}

.question-figure canvas {
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
}

.answer-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 16px;
}

.answer-btn {
    padding: 12px 20px;
    background: var(--bg-glass-strong);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.answer-btn:hover {
    background: rgba(108, 92, 231, 0.1);
    border-color: var(--primary-light);
}

.answer-btn.correct {
    background: rgba(0, 184, 148, 0.15);
    border-color: var(--success);
    color: var(--success);
}

.answer-btn.wrong {
    background: rgba(225, 112, 85, 0.15);
    border-color: var(--danger);
    color: var(--danger);
}

.answer-btn:disabled {
    pointer-events: none;
    opacity: 0.7;
}

.input-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 600;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
}

.quiz-input {
    flex: 1;
    max-width: 200px;
    padding: 10px 16px;
    background: var(--bg-glass-strong);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    outline: none;
}

.quiz-input:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15);
}

.answer-feedback {
    padding: 10px 16px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9rem;
    display: none;
    animation: fadeIn 0.3s ease;
}

.answer-feedback.show {
    display: block;
}

.answer-feedback.correct {
    background: rgba(0, 184, 148, 0.1);
    border: 1px solid rgba(0, 184, 148, 0.3);
    color: var(--success);
}

.answer-feedback.wrong {
    background: rgba(225, 112, 85, 0.1);
    border: 1px solid rgba(225, 112, 85, 0.3);
    color: var(--danger);
}

/* ========== Discovery Box ========== */
.discovery-box {
    text-align: center;
    padding: 32px;
    margin-top: 20px;
    background: linear-gradient(135deg, rgba(108, 92, 231, 0.1), rgba(0, 206, 201, 0.08));
    border: 1px solid rgba(108, 92, 231, 0.3);
    border-radius: var(--radius-lg);
    animation: pulseGlow 2s ease-in-out infinite;
}

@keyframes pulseGlow {

    0%,
    100% {
        box-shadow: 0 0 20px rgba(108, 92, 231, 0.1);
    }

    50% {
        box-shadow: 0 0 40px rgba(108, 92, 231, 0.2);
    }
}

.discovery-icon {
    font-size: 3rem;
    margin-bottom: 12px;
    animation: bounce 1s ease-in-out infinite;
}

@keyframes bounce {

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

    50% {
        transform: translateY(-8px);
    }
}

.discovery-box h4 {
    font-size: 1.3rem;
    color: var(--primary-light);
    margin-bottom: 12px;
}

.discovery-box p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ========== Footer ========== */
.main-footer {
    padding: 32px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    margin-top: 48px;
}

.footer-content p {
    color: var(--text-muted);
    font-size: 0.82rem;
}

.footer-sub {
    margin-top: 4px;
    font-size: 0.75rem;
    color: var(--text-muted);
    opacity: 0.6;
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-close {
        display: block;
    }

    .sidebar-overlay.active {
        display: block;
    }

    .main-content {
        margin-left: 0;
    }

    .menu-toggle {
        display: flex;
    }

    .section-hero {
        flex-direction: column;
        text-align: center;
        padding: 32px 24px;
    }

    .hero-desc {
        max-width: 100%;
    }

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

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

@media (max-width: 768px) {
    .content-section {
        padding: 20px 16px;
    }

    .topbar {
        padding: 0 16px;
    }

    .topbar-title {
        font-size: 0.95rem;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .question-content {
        flex-direction: column;
    }

    .question-figure {
        align-self: center;
    }

    .answer-options {
        grid-template-columns: 1fr;
    }

    .ratio-display,
    .measurement-display {
        flex-direction: column;
        align-items: center;
    }

    .canvas-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .section-header h2 {
        font-size: 1.3rem;
    }

    .step-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }

    .section-number {
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
    }

    .topbar-badges {
        display: none;
    }
}

/* ========== Scrollbar ========== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-dark);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* ========== Selection ========== */
::selection {
    background: rgba(108, 92, 231, 0.3);
    color: white;
}