/* ============================================
   ScienceClaw Landing Page — Academic Theme
   ============================================ */

:root {
    --navy: #0d1b2a;
    --deep-blue: #1b2838;
    --blue: #1e3a5f;
    --teal: #2a9d8f;
    --gold: #e9c46a;
    --light: #f8f9fa;
    --white: #ffffff;
    --gray-100: #f1f3f5;
    --gray-200: #e9ecef;
    --gray-500: #868e96;
    --gray-700: #495057;
    --gray-900: #212529;
    --font-serif: 'Playfair Display', Georgia, serif;
    --font-sans: 'Inter', -apple-system, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    color: var(--gray-900);
    line-height: 1.6;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- Navbar ---- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 20px 0;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(13, 27, 42, 0.95);
    backdrop-filter: blur(12px);
    padding: 12px 0;
    box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
    letter-spacing: 0.5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover { color: var(--white); }

.btn-nav {
    background: rgba(255,255,255,0.15) !important;
    padding: 8px 20px;
    border-radius: 6px;
    border: 1px solid rgba(255,255,255,0.25);
    transition: all 0.2s !important;
}

.btn-nav:hover {
    background: rgba(255,255,255,0.25) !important;
}

/* Mobile hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
    z-index: 101;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--white);
    transition: all 0.3s;
}

/* ---- Hero ---- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(13, 27, 42, 0.92) 0%,
        rgba(27, 40, 56, 0.88) 50%,
        rgba(30, 58, 95, 0.82) 100%
    );
    z-index: 0;
    pointer-events: none;
}

#heroCanvas {
    position: absolute;
    inset: 0;
    z-index: 1;
    width: 100%;
    height: 100%;
    pointer-events: auto;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 120px 0 80px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    border: 1px solid rgba(233, 196, 106, 0.4);
    border-radius: 20px;
    color: var(--gold);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 24px;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 700;
    color: var(--white);
    line-height: 1.1;
    margin-bottom: 16px;
    letter-spacing: -1px;
}

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

.hero-subtitle {
    font-size: 1.4rem;
    color: rgba(255,255,255,0.7);
    font-weight: 300;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.hero-desc {
    max-width: 640px;
    margin: 0 auto 40px;
    font-size: 1.05rem;
    color: rgba(255,255,255,0.6);
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: #238b7e;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(42, 157, 143, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 1px solid rgba(255,255,255,0.3);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
}

.stat { text-align: center; }

.stat-number {
    display: block;
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--white);
}

.stat-label {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.5);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.15);
}

/* ---- Section Headers ---- */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 16px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--gray-500);
    max-width: 560px;
    margin: 0 auto;
}

/* ---- Features ---- */
.features {
    padding: 100px 0;
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    padding: 36px;
    border-radius: 12px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.08);
    border-color: var(--teal);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(42,157,143,0.1), rgba(30,58,95,0.1));
    color: var(--teal);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--navy);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--gray-700);
    line-height: 1.7;
}

/* ---- Evolution Section ---- */
.evolution-section {
    padding: 100px 0;
    background: var(--gray-100);
}

.split-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.split-text h2 {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    color: var(--navy);
    margin-bottom: 20px;
}

.split-text p {
    color: var(--gray-700);
    margin-bottom: 20px;
    line-height: 1.7;
}

.evolution-steps {
    list-style: none;
    counter-reset: step;
    margin: 24px 0;
}

.evolution-steps li {
    counter-increment: step;
    padding: 12px 0 12px 48px;
    position: relative;
    color: var(--gray-700);
    border-left: 2px solid var(--gray-200);
    margin-left: 16px;
}

.evolution-steps li::before {
    content: counter(step);
    position: absolute;
    left: -17px;
    top: 12px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--teal);
    color: white;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

.subtle-text {
    font-style: italic;
    color: var(--gray-500) !important;
    font-size: 0.95rem;
}

.split-image img {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
}

/* ---- Comparison ---- */
.comparison-section {
    padding: 100px 0;
    background: var(--white);
}

.comparison-table {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    min-width: 500px;
}

.comparison-table th,
.comparison-table td {
    padding: 16px 24px;
    text-align: left;
    font-size: 0.95rem;
}

.comparison-table thead {
    background: var(--navy);
    color: var(--white);
}

.comparison-table thead th {
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.comparison-table tbody tr {
    border-bottom: 1px solid var(--gray-200);
    transition: background 0.2s;
}

.comparison-table tbody tr:hover {
    background: var(--gray-100);
}

.comparison-table tbody tr:last-child {
    border-bottom: none;
}

.highlight-col {
    background: rgba(42, 157, 143, 0.06);
    color: var(--navy);
}

thead .highlight-col {
    background: var(--teal) !important;
    color: var(--white) !important;
}

/* ---- How It Works ---- */
.how-it-works {
    padding: 100px 0;
    background: var(--navy);
    color: var(--white);
}

.how-it-works .section-header h2 {
    color: var(--white);
}

.how-it-works .section-header p {
    color: rgba(255,255,255,0.6);
}

.steps-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
}

.step {
    flex: 1;
    max-width: 300px;
    text-align: center;
    padding: 40px 24px;
    border-radius: 12px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--teal);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 700;
    margin: 0 auto 16px;
}

.step h3 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    margin-bottom: 16px;
}

.code-block {
    background: rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 8px;
    padding: 12px 16px;
    overflow-x: auto;
}

.code-block code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.8rem;
    color: var(--teal);
    white-space: nowrap;
}

.step-arrow {
    color: rgba(255,255,255,0.3);
    flex-shrink: 0;
}

/* ---- Disciplines ---- */
.disciplines {
    padding: 100px 0;
    background: var(--gray-100);
}

.disciplines-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 40px;
}

.discipline-group {
    padding: 32px;
    background: var(--white);
    border-radius: 12px;
    border: 1px solid var(--gray-200);
}

.discipline-group h4 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: var(--navy);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--teal);
}

.discipline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.discipline-tags span {
    padding: 6px 14px;
    background: var(--gray-100);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--gray-700);
    transition: all 0.2s;
}

.discipline-tags span:hover {
    background: var(--teal);
    color: white;
}

.databases-note {
    text-align: center;
    padding: 24px;
    background: var(--white);
    border-radius: 12px;
    border: 1px solid var(--gray-200);
}

.databases-note p {
    color: var(--gray-700);
    font-size: 0.95rem;
}

/* ---- Footer ---- */
.footer {
    padding: 60px 0 30px;
    background: var(--navy);
    color: rgba(255,255,255,0.7);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 40px;
}

.footer-brand h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--white);
    margin-bottom: 8px;
}

.footer-brand p {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.5);
}

.footer-links {
    display: flex;
    gap: 60px;
}

.footer-col h4 {
    color: var(--white);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 10px;
    transition: color 0.2s;
}

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

.footer-bottom {
    grid-column: 1 / -1;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 24px;
    margin-top: 24px;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

/* ---- Fade-in Animation ---- */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   RESPONSIVE — Tablet
   ============================================ */
@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .disciplines-grid { grid-template-columns: repeat(2, 1fr); }
    .split-content { gap: 40px; }
}

/* ============================================
   RESPONSIVE — Mobile
   ============================================ */
@media (max-width: 768px) {
    /* Navbar mobile */
    .nav-toggle { display: flex; }
    .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(13, 27, 42, 0.98);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 24px;
        z-index: 99;
    }
    .nav-links.open { display: flex; }
    .nav-links a { font-size: 1.2rem; }

    /* Hero mobile */
    .hero { min-height: 100vh; }
    .hero-content { padding: 80px 0 50px; }
    .hero h1 { font-size: 2.8rem; }
    .hero-subtitle { font-size: 1rem; letter-spacing: 1px; }
    .hero-desc { font-size: 0.95rem; margin-bottom: 30px; }
    .hero-buttons { flex-direction: column; align-items: center; gap: 12px; }
    .btn { width: auto; min-width: 220px; justify-content: center; padding: 12px 24px; }
    .hero-stats { flex-wrap: wrap; gap: 16px; }
    .stat-divider { display: none; }
    .stat { min-width: 40%; }
    .stat-number { font-size: 1.6rem; }
    .stat-label { font-size: 0.7rem; }

    /* Section headers */
    .section-header { margin-bottom: 40px; }
    .section-header h2 { font-size: 1.8rem; }
    .section-header p { font-size: 0.95rem; }

    /* Features */
    .features { padding: 60px 0; }
    .features-grid { grid-template-columns: 1fr; gap: 20px; }
    .feature-card { padding: 28px; }
    .feature-card h3 { font-size: 1.15rem; }
    .feature-card p { font-size: 0.9rem; }

    /* Evolution */
    .evolution-section { padding: 60px 0; }
    .split-content { grid-template-columns: 1fr; gap: 30px; }
    .split-text h2 { font-size: 1.8rem; }

    /* Comparison */
    .comparison-section { padding: 60px 0; }
    .comparison-table th,
    .comparison-table td { padding: 12px 14px; font-size: 0.85rem; }

    /* How It Works */
    .how-it-works { padding: 60px 0; }
    .steps-grid { flex-direction: column; gap: 16px; }
    .step { max-width: 100%; padding: 28px 20px; }
    .step-arrow { transform: rotate(90deg); }
    .code-block code { font-size: 0.7rem; }

    /* Disciplines */
    .disciplines { padding: 60px 0; }
    .disciplines-grid { grid-template-columns: 1fr; gap: 20px; }
    .discipline-group { padding: 24px; }
    .discipline-tags span { font-size: 0.8rem; padding: 5px 12px; }

    /* Footer */
    .footer { padding: 40px 0 20px; }
    .footer-content { grid-template-columns: 1fr; gap: 30px; }
    .footer-links { flex-direction: column; gap: 24px; }
}

/* ============================================
   RESPONSIVE — Small phones
   ============================================ */
@media (max-width: 400px) {
    .container { padding: 0 16px; }
    .hero h1 { font-size: 2.2rem; }
    .hero-badge { font-size: 0.7rem; padding: 4px 12px; }
    .stat { min-width: 45%; }
    .stat-number { font-size: 1.4rem; }
    .feature-card { padding: 20px; }
    .section-header h2 { font-size: 1.5rem; }
}