:root {
    /* Teal & Turquoise Palette */
    --primary: #14B8A6;
    --primary-hover: #0d9488;
    --secondary: #0F766E;
    --accent: #2DD4BF;
    --bg-main: #F8FAFC;
    --bg-surface: rgba(255, 255, 255, 0.7);
    --text-main: #0F172A;
    --text-muted: #64748b;
    --border-light: rgba(255, 255, 255, 0.5);
    --shadow-soft: 0 20px 40px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 20px rgba(20, 184, 166, 0.3);

    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 8px;

    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    background-image:
        radial-gradient(at 0% 0%, rgba(45, 212, 191, 0.1) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(15, 118, 110, 0.1) 0px, transparent 50%);
}

.hidden {
    display: none !important;
}

/* Glassmorphism Utilities */
.glass-panel {
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
}

.glass-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--secondary);
}

nav {
    display: flex;
    gap: 0.5rem;
}

nav button {
    background: transparent;
    border: none;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    border-radius: var(--radius-sm);
}

nav button.active,
nav button:hover {
    color: var(--primary);
    background: rgba(20, 184, 166, 0.1);
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
}

.mobile-toggle:hover {
    background: rgba(20, 184, 166, 0.1);
}

h1,
h2,
h3 {
    font-weight: 700;
}

main#app {
    padding-top: 90px;
    min-height: 100vh;
}

.view-section {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

/* HOME VIEW - HERO */
.hero-banner {
    position: relative;
    padding: 6rem 4rem;

    background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 0%, rgba(15, 118, 110, 0.7) 100%), url('../img/hero-bg.png');
    background-size: cover;
    background-position: center;
    color: white;
    text-align: left;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 700px;
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: white;
}

.hero-content h1 span {
    color: var(--accent);
}

.hero-content p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    margin-bottom: 2rem;
}

/* HOME SALES - FEATURES */
.features-section {
    padding-top: 5rem;
    padding-bottom: 4rem;
}

.intro-text {
    text-align: center;
    margin-bottom: 3rem;
}

.intro-text h2 {
    font-size: 2.2rem;
    color: var(--secondary);
    margin-bottom: 0.5rem;
}

.intro-text p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    padding: 2.5rem 2rem;
    text-align: center;
}

.f-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    background: rgba(20, 184, 166, 0.1);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.f-icon svg {
    width: 32px;
    height: 32px;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--secondary);
}
/* TYPOGRAPHY */
h1, h2, h3, h4, h5, h6 {
    color: var(--secondary);
    line-height: 1.3;
}

.section-title {
    font-size: 3rem;
    color: var(--secondary);
    margin-bottom: 1rem;
}

/* HOME SALES - ARTICLE */
.home-article-wrapper {
    background: linear-gradient(180deg, transparent 0%, rgba(20, 184, 166, 0.05) 100%);
    padding: 4rem 0;
    margin-bottom: 2rem;
}

.home-article {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 4rem;
    align-items: center;
    padding: 4rem !important;
}

.home-article h2 {
    font-size: 2.5rem;
    color: var(--secondary);
    margin-bottom: 1.5rem;
}

.home-article p {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.giant-icon {
    width: 200px;
    height: 200px;
    color: var(--primary);
    opacity: 0.2;
    transform: rotate(-15deg);
    transition: var(--transition);
}

.home-article:hover .giant-icon {
    transform: rotate(0deg) scale(1.1);
    opacity: 0.4;
}

.image-content {
    display: flex;
    justify-content: center;
}

/* LIBRARY FILTERS */
.filter-tabs {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1.2rem;
    border-radius: 20px;
    border: 1px solid var(--primary);
    background: transparent;
    color: var(--primary);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
    white-space: nowrap;
}

.filter-btn:hover {
    background: rgba(20, 184, 166, 0.1);
}

.filter-btn.active {
    background: var(--primary);
    color: white;
}

/* SOLIDS GRID */
.solids-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    perspective: 1000px;
}

.solid-card {
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    transform-style: preserve-3d;
    box-shadow: var(--shadow-soft);
    position: relative;
}

.solid-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-glow);
    border-color: var(--primary);
}

.card-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: rgba(45, 212, 191, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

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

.solid-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.solid-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ABOUT / FAQ VIEW */
.about-container {
    padding: 4rem;
    max-width: 900px;
    margin: 0 auto;
}

.about-header {
    text-align: center;
    margin-bottom: 3rem;
}

.about-header h2 {
    font-size: 2.5rem;
    color: var(--secondary);
    margin-bottom: 0.5rem;
}

.about-content h3 {
    font-size: 1.5rem;
    color: var(--secondary);
    margin-bottom: 1rem;
}

.about-content p {
    line-height: 1.7;
    color: var(--text-muted);
    margin-bottom: 1rem;
    font-size: 1.05rem;
}

.faq-accordion details {
    margin-bottom: 1rem;
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: 1.25rem 1.5rem;
    transition: var(--transition);
}

.faq-accordion details[open] {
    background: white;
    border-color: var(--primary);
    box-shadow: var(--shadow-soft);
}

.faq-accordion summary {
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-main);
}

.faq-accordion summary::-webkit-details-marker {
    display: none;
}

.faq-accordion details p {
    margin-top: 1rem;
    margin-bottom: 0;
    color: var(--text-muted);
    line-height: 1.6;
}

/* VIEWER VIEW */
.viewer-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

#btn-back {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: none;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

#btn-back:hover {
    color: var(--primary);
    transform: translateX(-5px);
}

.viewer-layout {
    display: grid;
    grid-template-columns: 1fr 350px;
    grid-template-rows: 60vh auto auto;
    gap: 2rem;
    grid-template-areas: "canvas sidebar" "math math" "edu edu";
}

.canvas-wrapper {
    grid-area: canvas;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at center, rgba(255, 255, 255, 1) 0%, rgba(248, 250, 252, 0.8) 100%);
}

.canvas-overlay {
    position: absolute;
    top: 1.5rem;
    left: 1.5rem;
    right: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    pointer-events: none;
    z-index: 10;
}

.canvas-overlay * {
    pointer-events: auto;
}

.viewer-actions {
    display: flex;
    gap: 0.5rem;
}

#webgl-container canvas {
    outline: none;
    cursor: grab;
    width: 100% !important;
    height: 100% !important;
    position: absolute;
    top: 0;
    left: 0;
}

#webgl-container canvas:active {
    cursor: grabbing;
}

.side-panel {
    grid-area: sidebar;
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.sliders-list {
    margin-top: 1.5rem;
    flex: 1;
}

.slider-group {
    margin-bottom: 1.5rem;
}

.slider-group label {
    display: flex;
    justify-content: space-between;
    font-weight: 500;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    color: var(--text-main);
}

.slider-group input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
    cursor: pointer;
}

.slider-value {
    color: var(--primary);
    font-weight: 600;
}

.action-buttons {
    margin-top: auto;
}

.btn-primary {
    width: 100%;
    padding: 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 10px 20px rgba(20, 184, 166, 0.2);
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

.btn-primary:disabled {
    background: #cbd5e1;
    cursor: not-allowed;
    box-shadow: none;
}

.bottom-panel {
    grid-area: math;
    padding: 2rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.result-card {
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.result-card.highlight {
    background: rgba(20, 184, 166, 0.05);
    border: 1px solid var(--accent);
}

.result-card .label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.result-card strong {
    font-size: 2rem;
    color: var(--secondary);
}

.formula-visual {
    font-family: monospace;
    font-size: 0.95rem;
    color: var(--primary);
    background: rgba(255, 255, 255, 0.7);
    padding: 0.5rem 0.8rem;
    border-radius: 6px;
    margin-top: 0.5rem;
    display: block;
}

/* Educational Panel & Article Topic Formatting */
.edu-panel {
    grid-area: edu;
    padding: 3rem;
    background: rgba(255, 255, 255, 0.6);
}

.edu-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--secondary);
    margin-bottom: 2rem;
    border-bottom: 2px solid rgba(20, 184, 166, 0.2);
    padding-bottom: 1rem;
}

.edu-header h3 {
    font-size: 1.5rem;
    margin: 0;
}

.edu-article-content h3,
.edu-article-content h4 {
    font-size: 1.25rem;
    color: var(--secondary);
    margin: 2.5rem 0 1rem;
    font-weight: 700;
}

.edu-article-content h3:first-child,
.edu-article-content h4:first-child {
    margin-top: 0;
}

.edu-article-content p {
    line-height: 1.8;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.edu-article-content ul {
    margin: 0 0 2rem 0;
    padding-left: 0;
    list-style: none;
}

.edu-article-content li {
    line-height: 1.7;
    color: var(--text-muted);
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
    font-size: 1.05rem;
}

.edu-article-content li::before {
    content: "•";
    color: var(--primary);
    font-weight: bold;
    font-size: 1.5rem;
    position: absolute;
    left: 0;
    top: -4px;
}

.edu-article-content strong {
    color: var(--secondary);
    font-weight: 600;
}

.edu-article-content code {
    background: rgba(20, 184, 166, 0.1);
    color: var(--primary);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.95em;
    font-weight: bold;
}

/* Inline SVG Net Styles */
.net-svg {
    width: 100%;
    max-width: 400px;
    height: auto;
    display: block;
    margin: 0 auto;
}

.net-svg rect,
.net-svg polygon,
.net-svg circle,
.net-svg path,
.net-svg polyline {
    fill: rgba(20, 184, 166, 0.1);
    stroke: var(--primary);
    stroke-width: 1.5;
    transition: all 0.3s ease;
}

.net-svg:hover rect,
.net-svg:hover polygon,
.net-svg:hover circle,
.net-svg:hover path,
.net-svg:hover polyline {
    fill: rgba(20, 184, 166, 0.2);
    stroke-width: 2;
}

/* Rich topic boxes */
.article-topic {
    background: rgba(255, 255, 255, 0.8);
    border-left: 4px solid var(--primary);
    padding: 1.5rem;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
}

.article-topic h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.15rem;
    color: var(--secondary);
    margin-bottom: 1rem;
}

.article-topic p {
    margin-bottom: 0.5rem;
}

.article-topic p:last-child {
    margin-bottom: 0;
}

.article-topic ul {
    padding-left: 1.5rem;
    color: var(--text-muted);
}

.article-topic li {
    margin-bottom: 0.5rem;
}

/* FOOTER */
.app-footer {
    background: var(--text-main);
    color: rgba(255, 255, 255, 0.7);
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    padding-top: 4rem;
    padding-bottom: 4rem;
}

.footer-col h4 {
    color: white;
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.footer-col a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin-bottom: 0.8rem;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--accent);
}

.footer-col.brand p {
    margin-top: 1rem;
    line-height: 1.6;
    font-size: 0.95rem;
}

.social-icons {
    display: flex;
    gap: 1rem;
}

.social-icons a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white; /* Explicitly set color for lucide icons */
}

.social-icons a svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
}

.social-icons a:hover {
    background: var(--primary);
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
}

/* Modals & Net SVGs */
.net-svg {
    width: 100%;
    max-width: 350px;
    height: auto;
    margin: 0 auto;
    display: block;
    filter: drop-shadow(0 10px 15px rgba(20, 184, 166, 0.2));
}

.net-svg path,
.net-svg polygon,
.net-svg circle,
.net-svg rect,
.net-svg line,
.net-svg polyline {
    fill: rgba(20, 184, 166, 0.1);
    stroke: var(--primary);
    stroke-width: 1.5;
    stroke-linejoin: round;
    transition: all 0.5s ease;
}

.net-svg:hover path,
.net-svg:hover polygon,
.net-svg:hover circle,
.net-svg:hover rect,
.net-svg:hover line,
.net-svg:hover polyline {
    fill: rgba(20, 184, 166, 0.3);
}

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    width: 90%;
    max-width: 800px;
    height: 80vh;
    padding: 2rem;
    position: relative;
    display: flex;
    flex-direction: column;
}

.close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
}

.icon-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.icon-btn.small {
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.85rem;
}

.icon-btn.small:hover {
    background: var(--primary);
    color: white;
}

/* Quiz Styles */
.quiz-opt-btn { width: 100%; text-align: left; padding: 1.25rem; margin-bottom: 0.5rem; border: 2px solid var(--border-light); background: white; border-radius: var(--radius-sm); font-size: 1.1rem; color: var(--text-main); font-weight: 500; cursor: pointer; transition: var(--transition); box-shadow: var(--shadow-soft); }
.quiz-opt-btn:hover:not(:disabled) { border-color: var(--primary); transform: translateX(5px); }
.quiz-opt-btn:disabled { opacity: 0.8; }

/* Print PDF Cheat Sheet */
.print-only { display: none; }
@media print {
    body * { visibility: hidden !important; }
    #print-container, #print-container * { visibility: visible !important; }
    #print-container { position: absolute; left: 0; top: 0; width: 100%; display: block !important; background: white; color: black; padding: 0; }
    .print-sheet-title { font-size: 24pt; font-weight: bold; text-align: center; margin-bottom: 1cm; color: black; border-bottom: 2pt solid black; padding-bottom: 10pt; }
    .print-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1cm; }
    .print-item { page-break-inside: avoid; border: 1pt solid #ccc; padding: 15pt; border-radius: 8pt; }
    .print-item h4 { font-size: 14pt; margin-bottom: 10pt; border-bottom: 1pt solid #eee; padding-bottom: 5pt;}
    .print-item ul { margin-left: 20pt; }
    .print-item li { margin-bottom: 5pt; font-size: 11pt; }
}

/* Responsive */
@media (max-width: 1024px) {
    .viewer-layout {
        grid-template-columns: 1fr;
        grid-template-rows: 50vh auto auto auto;
        grid-template-areas: "canvas" "sidebar" "math" "edu";
    }
}

@media (max-width: 768px) {
    .section-title {
        font-size: 2rem !important;
    }

    .glass-header {
        padding: 0 1rem;
    }

    .view-section {
        padding: 1rem 0.5rem;
    }

    .filter-tabs {
        justify-content: flex-start;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 0.8rem;
        scrollbar-width: none; /* Firefox */
    }
    
    .filter-tabs::-webkit-scrollbar {
        display: none; /* Chrome, Safari and Opera */
    }

    .solids-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 1rem;
    }

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

    .hero-banner {
        padding: 3rem 1rem;
        text-align: center;
    }

    .hero-content h1 {
        font-size: 2.2rem;
    }

    .hero-content {
        margin: 0 auto;
    }

    .solid-card {
        padding: 1.5rem 1rem;
    }

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

    .home-article {
        grid-template-columns: 1fr;
        padding: 2rem !important;
        gap: 2rem;
        text-align: center;
    }

    .home-article h2 {
        font-size: 2rem;
    }

    .giant-icon {
        width: 120px;
        height: 120px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .social-icons {
        justify-content: center;
    }

    .footer-col.brand .logo {
        justify-content: center;
    }

    .viewer-layout {
        gap: 1rem;
        grid-template-rows: 40vh auto auto auto;
    }

    .canvas-overlay {
        top: 0.5rem;
        left: 0.5rem;
        right: 0.5rem;
        flex-direction: row;
        align-items: center;
        flex-wrap: nowrap;
        gap: 0.5rem;
    }

    #solid-title {
        font-size: 1.15rem;
        line-height: 1.1;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        flex: 1;
    }

    .viewer-actions {
        width: auto;
        justify-content: flex-end;
        gap: 0.3rem;
        flex-shrink: 0;
    }

    .viewer-actions .icon-btn.small {
        padding: 0.4rem 0.6rem;
        font-size: 0.8rem;
    }

    .viewer-actions .icon-btn.small svg, 
    .viewer-actions .icon-btn.small i {
        width: 16px !important;
        height: 16px !important;
    }

    .side-panel {
        padding: 1.5rem 1rem;
    }

    .bottom-panel {
        padding: 1.5rem 1rem;
    }

    .result-card {
        padding: 1rem;
    }

    .mobile-toggle {
        display: block;
    }

    #main-nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(30px);
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--border-light);
        display: none;
        box-shadow: 0 15px 30px rgba(0,0,0,0.1);
    }

    #main-nav.mobile-active {
        display: flex;
    }

    #main-nav button {
        width: 100%;
        text-align: left;
        padding: 1rem;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

    #main-nav button:last-child {
        border-bottom: none;
    }

    .about-container {
        padding: 1.5rem 1rem;
    }

    .edu-panel {
        padding: 1.5rem 1rem;
    }
}