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

:root {
    --white: #ffffff;
    --bg: #fafafa;
    --gray-50: #f8f9fa;
    --gray-100: #f1f3f5;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #868e96;
    --gray-600: #495057;
    --gray-700: #343a40;
    --gray-800: #212529;
    --gray-900: #0d0f12;

    --orange: #4a90d9;
    --orange-light: #eef4fb;
    --blue: #4a90d9;
    --blue-light: #eef4fb;
    --green: #2ecc71;
    --green-light: #eafaf1;
    --purple: #8b5cf6;
    --purple-light: #f3effe;
    --pink: #ec4899;
    --pink-light: #fdf2f8;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 16px 50px rgba(0, 0, 0, 0.1);

    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    color: var(--gray-800);
    background: var(--white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
}

.nav-container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--gray-900);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.logo span {
    color: var(--orange);
}

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

.nav-links a {
    text-decoration: none;
    color: var(--gray-600);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a.active {
    color: var(--orange);
    font-weight: 700;
}

.nav-links a:hover {
    color: var(--gray-900);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-menu-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: all 0.3s;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font);
}

.btn-primary {
    background: var(--gray-900);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--gray-700);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--white);
    color: var(--gray-800);
    border: 1.5px solid var(--gray-300);
}

.btn-secondary:hover {
    border-color: var(--gray-400);
    background: var(--gray-50);
    transform: translateY(-1px);
}

.btn-nav {
    padding: 8px 20px;
    background: var(--gray-900);
    color: var(--white);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
}

.btn-nav:hover {
    background: var(--gray-700);
    color: var(--white) !important;
}

.btn-full {
    width: 100%;
}

/* ===== Quote Banner ===== */
.quote-banner {
    padding: 100px 0 40px;
    text-align: center;
    background: var(--bg);
}

.quote-text {
    font-size: 1.2rem;
    font-style: italic;
    font-weight: 500;
    color: var(--gray-700);
    line-height: 1.7;
    max-width: 560px;
    margin: 0 auto 12px;
    letter-spacing: -0.01em;
}

.quote-author {
    display: block;
    font-size: 0.88rem;
    font-style: normal;
    font-weight: 600;
    color: var(--gray-400);
}

/* ===== Hero Section ===== */
.hero {
    padding: 80px 0 80px;
    text-align: center;
    background: var(--white);
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--orange-light);
    color: var(--orange);
    font-size: 0.82rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 24px;
}

.hero h1 {
    font-size: clamp(2.8rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: -0.03em;
    color: var(--gray-900);
    margin-bottom: 24px;
}

.hero h1 .highlight {
    color: var(--orange);
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--gray-500);
    max-width: 580px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 14px;
    justify-content: center;
    margin-bottom: 64px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 64px;
    padding-top: 56px;
    border-top: 1px solid var(--gray-200);
    max-width: 800px;
    margin: 0 auto;
}

.stat-number {
    font-size: 3.2rem;
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -0.03em;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--gray-500);
    margin-top: 6px;
}

/* ===== Section Header (reusable) ===== */
.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--blue-light);
    color: var(--blue);
    font-size: 0.82rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: clamp(1.8rem, 3.5vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--gray-900);
    margin-bottom: 16px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== Study Sections ===== */
/* Executive Summary */
.exec-summary {
    padding: 80px 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-100);
}

.section-intro {
    font-size: 1.1rem;
    color: var(--gray-500);
    max-width: 680px;
    line-height: 1.7;
    margin-top: 12px;
    margin-left: auto;
    margin-right: auto;
}

.exec-ranges {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 48px 0;
}

.range-card {
    background: var(--bg);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
}

.range-card.range-highlight,
.range-card.range-warning {
    background: var(--bg);
    border-color: var(--gray-200);
}

.range-grades {
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--gray-500);
    margin-bottom: 8px;
}

.range-number {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.range-highlight .range-number {
    color: var(--gray-900);
}

.range-label {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-top: 6px;
}

.exec-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 48px;
}

.exec-block h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.exec-block h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.exec-block ul {
    list-style: none;
    padding: 0;
    margin-bottom: 24px;
}

.exec-block ul li {
    padding: 6px 0 6px 20px;
    position: relative;
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.6;
}

.exec-block ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--orange);
}

.exec-note {
    font-size: 0.9rem;
    color: var(--gray-500);
    margin-top: 16px;
    padding: 12px 16px;
    background: var(--bg);
    border-radius: var(--radius);
    border-left: 3px solid var(--orange);
}

.exec-section-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 24px;
    padding-top: 8px;
}

.exec-findings {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-bottom: 48px;
}

.finding-item {
    padding: 20px 0;
    border-bottom: 1px solid var(--gray-200);
}

.finding-item:first-child {
    border-top: 1px solid var(--gray-200);
}

.finding-source {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 6px;
}

.finding-year {
    font-weight: 500;
    color: var(--gray-400);
    margin-left: 8px;
}

.finding-item p {
    font-size: 0.92rem;
    color: var(--gray-600);
    line-height: 1.65;
}

.exec-table {
    margin-bottom: 48px;
}

.impact-positive {
    color: #16a34a;
    font-weight: 600;
}

.exec-cost {
    background: var(--bg);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.exec-cost h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 24px;
}

.exec-cost .exec-grid {
    margin-bottom: 16px;
}

.exec-quotes {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 48px;
}

.expert-quote {
    background: var(--bg);
    border-left: 3px solid var(--orange);
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    padding: 28px 32px;
}

.expert-quote p {
    font-size: 1rem;
    font-style: italic;
    color: var(--gray-700);
    line-height: 1.7;
    margin-bottom: 12px;
}

.expert-quote cite {
    font-size: 0.85rem;
    font-style: normal;
    font-weight: 600;
    color: var(--gray-500);
}

/* Reasons List (Why Classes Get Bigger) */
.reasons-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.reason-item {
    display: flex;
    gap: 20px;
    padding: 24px 0;
    border-bottom: 1px solid var(--gray-200);
}

.reason-item:first-child {
    border-top: 1px solid var(--gray-200);
}

.reason-number {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    color: var(--gray-600);
    font-size: 0.85rem;
    font-weight: 700;
    border-radius: 50%;
    margin-top: 2px;
}

.reason-content h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 6px;
}

.reason-content p {
    font-size: 0.92rem;
    color: var(--gray-600);
    line-height: 1.65;
    margin-bottom: 10px;
}

.reason-mitigation {
    font-size: 0.85rem;
    color: var(--gray-500);
    line-height: 1.6;
    padding: 10px 14px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--green);
}

.reason-mitigation strong {
    color: var(--gray-700);
}

.study-section {
    padding: 80px 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-100);
}

.study-section.study-alt {
    background: var(--bg);
}

.study-label {
    display: inline-block;
    padding: 4px 14px;
    background: var(--orange-light);
    color: var(--orange);
    font-size: 0.78rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 16px;
}

.study-title {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--gray-900);
    margin-bottom: 36px;
}

/* Big Numbers Row */
.study-big-numbers {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
    padding: 32px 0;
    margin-bottom: 36px;
    border-top: 1px solid var(--gray-200);
    border-bottom: 1px solid var(--gray-200);
}

.big-number-item {
    flex: 1;
    min-width: 120px;
    text-align: center;
}

.big-number {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.big-number-label {
    font-size: 0.82rem;
    color: var(--gray-500);
    margin-top: 6px;
    font-weight: 500;
}

/* Study Body: Key Points + Data Table side by side */
.study-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
}

.study-body:has(.study-key-points:only-child) {
    grid-template-columns: 1fr;
}

.study-key-points h3,
.study-data-table h3,
.study-summary h3 {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--gray-400);
    margin-bottom: 16px;
}

.study-key-points ul {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.study-key-points li {
    font-size: 0.92rem;
    color: var(--gray-600);
    line-height: 1.6;
    padding-left: 20px;
    position: relative;
}

.study-key-points li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 9px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--orange);
}

.study-key-points li strong {
    color: var(--gray-800);
    font-weight: 600;
}

/* Mini Table */
.mini-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.mini-table thead {
    background: var(--gray-50);
}

.mini-table th {
    padding: 10px 14px;
    text-align: left;
    font-weight: 700;
    color: var(--gray-600);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    border-bottom: 2px solid var(--gray-200);
}

.mini-table td {
    padding: 10px 14px;
    color: var(--gray-600);
    border-bottom: 1px solid var(--gray-100);
    font-variant-numeric: tabular-nums;
}

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

.mini-table tbody tr:hover {
    background: var(--gray-50);
}

/* Study Summary */
.study-summary {
    padding: 24px 28px;
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-100);
    margin-bottom: 24px;
}

.study-summary p {
    font-size: 0.94rem;
    color: var(--gray-600);
    line-height: 1.7;
}

/* ===== Resources Page ===== */
.page-header {
    padding: 140px 0 60px;
    text-align: center;
    background: var(--white);
}

.page-header h1 {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--gray-900);
    margin: 16px 0 16px;
}

.resources-section {
    padding: 80px 0;
    background: var(--white);
}

.resources-section.resources-alt {
    background: var(--bg);
}

.resources-heading {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.resources-intro {
    font-size: 1rem;
    color: var(--gray-500);
    margin-bottom: 40px;
    line-height: 1.7;
}

/* Resource Cards (study list) */
.resource-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.resource-card {
    display: flex;
    gap: 24px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all 0.25s;
}

.resource-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.resource-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.resource-card-content h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.resource-card-content p {
    font-size: 0.92rem;
    color: var(--gray-500);
    line-height: 1.65;
}

/* Study metadata tags */
.study-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.meta-tag {
    display: inline-block;
    padding: 3px 10px;
    background: var(--gray-100);
    color: var(--gray-600);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

/* Effect size display */
.effect-sizes {
    margin-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-100);
}

.effect-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.effect-label {
    font-size: 0.82rem;
    color: var(--gray-500);
    font-weight: 500;
}

.effect-value {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--gray-800);
    font-variant-numeric: tabular-nums;
    text-align: right;
}

/* Data comparison table */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    background: var(--white);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.data-table thead {
    background: var(--gray-50);
}

.data-table th {
    padding: 14px 16px;
    text-align: left;
    font-weight: 700;
    color: var(--gray-700);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-bottom: 2px solid var(--gray-200);
    white-space: nowrap;
}

.data-table td {
    padding: 14px 16px;
    color: var(--gray-600);
    border-bottom: 1px solid var(--gray-100);
    line-height: 1.5;
}

.data-table tbody tr:hover {
    background: var(--gray-50);
}

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

.data-table td strong {
    color: var(--gray-900);
    font-weight: 700;
}

.table-sub {
    font-size: 0.78rem;
    color: var(--gray-400);
}

.row-null {
    background: var(--gray-50);
}

.row-null td {
    color: var(--gray-500);
}

/* Source links */
.source-links {
    margin-top: 24px;
    padding: 24px 28px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
}

.source-links h4 {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--gray-500);
    margin-bottom: 12px;
}

.source-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.source-links li {
    padding-left: 0;
}

.source-links a {
    font-size: 0.88rem;
    color: var(--blue);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    word-break: break-word;
}

.source-links a:hover {
    color: var(--gray-900);
    text-decoration: underline;
}

.resources-alt .source-links {
    background: var(--gray-50);
}

/* Articles Grid */
.resources-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.resource-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 24px 0;
    border-bottom: 1px solid var(--gray-200);
    text-decoration: none;
    transition: all 0.2s;
}

.resource-item:first-child {
    border-top: 1px solid var(--gray-200);
}

.resource-item:hover {
    padding-left: 12px;
}

.resource-item:hover h3 {
    color: var(--primary);
}

.resource-info h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
    transition: color 0.2s;
}

.resource-info p {
    font-size: 0.88rem;
    color: var(--gray-500);
    line-height: 1.55;
}

.resource-arrow {
    font-size: 1.25rem;
    color: var(--gray-400);
    flex-shrink: 0;
    transition: all 0.2s;
}

.resource-item:hover .resource-arrow {
    color: var(--primary);
    transform: translateX(4px);
}

/* Organizations Grid */
.org-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.org-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all 0.25s;
}

.org-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.org-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 10px;
}

.org-card p {
    font-size: 0.88rem;
    color: var(--gray-500);
    line-height: 1.65;
}

/* Resources CTA */
.resources-cta {
    padding: 80px 0;
    background: var(--bg);
}

.cta-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: 56px;
    text-align: center;
}

.cta-card h2 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.cta-card p {
    font-size: 1rem;
    color: var(--gray-500);
    max-width: 500px;
    margin: 0 auto 28px;
    line-height: 1.7;
}

/* ===== Timeline ===== */
.timeline-section {
    padding: 0 0 80px;
    background: var(--white);
}

.timeline {
    position: relative;
    padding: 20px 0;
}

/* Vertical line */
.timeline::before {
    content: '';
    position: absolute;
    left: 80px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gray-200);
}

.timeline-item {
    position: relative;
    display: flex;
    align-items: flex-start;
    gap: 32px;
    padding: 0 0 48px;
    padding-left: 112px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

/* The dot on the line */
.timeline-marker {
    position: absolute;
    left: 72px;
    top: 6px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--white);
    border: 3px solid var(--gray-300);
    z-index: 2;
}

.timeline-marker.marker-major {
    border-color: var(--orange);
    background: var(--orange-light);
    box-shadow: 0 0 0 4px rgba(74, 144, 217, 0.15);
}

/* Year label */
.timeline-date {
    position: absolute;
    left: 0;
    top: 2px;
    width: 56px;
    font-size: 1rem;
    font-weight: 800;
    color: var(--gray-900);
    text-align: right;
    letter-spacing: -0.02em;
}

/* Content card */
.timeline-content {
    background: var(--bg);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    flex: 1;
    transition: all 0.25s;
}

a.timeline-link {
    text-decoration: none;
    color: inherit;
    display: block;
    cursor: pointer;
}

.timeline-content:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--gray-300);
}

.timeline-content h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.timeline-content p {
    font-size: 0.92rem;
    color: var(--gray-600);
    line-height: 1.7;
}

/* Tags */
.timeline-tag {
    display: inline-block;
    padding: 3px 10px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
    margin-bottom: 10px;
}

.tag-academic {
    background: var(--blue-light);
    color: var(--blue);
}

.tag-experiment {
    background: var(--green-light);
    color: #16a34a;
}

.tag-policy {
    background: var(--purple-light);
    color: var(--purple);
}

.tag-counterpoint {
    background: var(--pink-light);
    color: var(--pink);
}

.tag-socioemotional {
    background: #fff7ed;
    color: #ea580c;
}

/* Summary block at bottom */
.timeline-summary {
    text-align: center;
    margin-top: 64px;
    padding: 48px 40px;
    background: var(--bg);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
}

.timeline-summary h2 {
    font-size: clamp(1.4rem, 3vw, 1.8rem);
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.timeline-summary p {
    font-size: 1rem;
    color: var(--gray-500);
    line-height: 1.7;
    max-width: 640px;
    margin: 0 auto;
}

/* ===== Footer ===== */
.footer {
    background: var(--gray-900);
    padding: 48px 0 32px;
    color: var(--gray-400);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo {
    color: var(--white);
}

.footer-brand p {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-top: 8px;
    max-width: 300px;
}

.footer-links {
    display: flex;
    gap: 28px;
}

.footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

.footer-bottom {
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--gray-500);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--white);
        border-bottom: 1px solid var(--gray-200);
        padding: 20px 24px;
        gap: 16px;
        box-shadow: var(--shadow-md);
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding: 60px 0;
    }

    .hero h1 {
        font-size: 2.4rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
        align-items: center;
    }

    .exec-summary {
        padding: 60px 0;
    }

    .exec-ranges {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .range-card {
        padding: 24px;
        display: flex;
        align-items: center;
        gap: 16px;
        text-align: left;
    }

    .range-grades {
        margin-bottom: 0;
        min-width: 70px;
    }

    .range-number {
        font-size: 2rem;
        min-width: 90px;
    }

    .range-label {
        margin-top: 0;
    }

    .exec-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .exec-quotes {
        grid-template-columns: 1fr;
    }

    .study-section {
        padding: 60px 0;
    }

    .study-body {
        grid-template-columns: 1fr;
    }

    .study-big-numbers {
        gap: 20px;
    }

    .big-number-item {
        min-width: 100px;
    }

    .data-table {
        font-size: 0.8rem;
    }

    .data-table th,
    .data-table td {
        padding: 10px 12px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 24px;
    }

    /* Timeline responsive */
    .timeline::before {
        left: 20px;
    }

    .timeline-marker {
        left: 12px;
        width: 16px;
        height: 16px;
    }

    .timeline-date {
        position: relative;
        left: auto;
        top: auto;
        width: auto;
        text-align: left;
        margin-bottom: 8px;
        font-size: 0.9rem;
    }

    .timeline-item {
        padding-left: 52px;
        flex-direction: column;
        gap: 0;
        padding-bottom: 36px;
    }

    .timeline-content {
        padding: 20px;
    }

    .timeline-summary {
        padding: 32px 24px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .study-big-numbers {
        flex-direction: column;
        align-items: center;
    }

    .study-summary {
        padding: 20px;
    }

    .source-links {
        padding: 20px;
    }

    .cta-card {
        padding: 36px 24px;
    }
}