/* ============================================
   Cognitive Content — Global Styles
   A scientific publication for the thinking web
   ============================================ */

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

:root {
  --white: #ffffff;
  --snow: #fafbfc;
  --surface: #f5f5f7;
  --border: #d2d2d7;
  --border-light: #e8e8ed;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #86868b;
  --accent: #0066cc;
  --accent-hover: #004499;
  --accent-light: #e8f0fe;
  --success: #248a3d;
  --error: #d70015;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --max-width: 1200px;
  --reading-width: 720px;
  --nav-height: 64px;
  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-height) + 2rem); }

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text);
  letter-spacing: -0.01em;
}

/* ---- Navigation ---- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-inner {
  width: 100%;
  max-width: var(--max-width);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-logo:hover { color: var(--text); }

.nav-logo .logo-mark {
  width: 32px; height: 32px;
  background: var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.85rem;
  font-weight: 700;
  font-family: var(--font-body);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}

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

.nav-links a.active { color: var(--text); }

.nav-auth {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  line-height: 1.4;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}
.btn-ghost:hover { color: var(--text); background: var(--surface); }

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

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn-outline:hover { background: var(--accent); color: var(--white); }

.btn-lg {
  padding: 0.75rem 2rem;
  font-size: 1rem;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text);
}

.mobile-toggle svg { width: 24px; height: 24px; }

/* ---- Hero ---- */
.hero {
  padding: 10rem 2rem 6rem;
  text-align: center;
  background: var(--white);
  position: relative;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 10%; right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

.hero-image-placeholder {
  max-width: 900px;
  margin: 3rem auto 0;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  overflow: hidden;
  background: linear-gradient(135deg, var(--surface) 0%, var(--border-light) 100%);
}

.hero-image-placeholder img {
  width: 100%;
  height: auto;
  display: block;
}

/* ---- Sections ---- */
.section {
  padding: 5rem 2rem;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-header h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  margin-bottom: 1rem;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* ---- Article Cards ---- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.article-card {
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s ease;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  color: inherit;
  border-color: var(--border);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.article-card-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--surface) 0%, var(--border-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  border-bottom: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.article-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-card-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-card-category {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.article-card-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

.article-card-body p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.article-card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-light);
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* ---- About / Features Section ---- */
.about-section {
  background: var(--snow);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-content h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  margin-bottom: 1.25rem;
}

.about-content p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
}

.about-image-placeholder {
  width: 100%;
  height: 400px;
  background: linear-gradient(135deg, var(--surface) 0%, var(--border-light) 100%);
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: 0.875rem;
  font-family: var(--font-mono);
}

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

.pillar {
  padding: 2rem;
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  transition: all 0.3s ease;
}

.pillar:hover {
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.pillar-icon {
  width: 48px; height: 48px;
  background: var(--accent-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  font-size: 1.25rem;
}

.pillar h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

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

/* ---- Network Section ---- */
.network-section {
  text-align: center;
}

.network-nodes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.network-node {
  padding: 1.5rem;
  background: var(--white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  transition: all 0.3s ease;
}

.network-node:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.network-node h4 {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.network-node p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.network-node .node-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

/* ---- Article Page ---- */
.article-hero {
  padding: 8rem 2rem 3rem;
  text-align: center;
  border-bottom: 1px solid var(--border-light);
}

.article-hero-category {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.article-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  max-width: 800px;
  margin: 0 auto 1.5rem;
}

.article-hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  font-size: 0.875rem;
  color: var(--text-tertiary);
  flex-wrap: wrap;
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.article-hero-image {
  max-width: 900px;
  margin: 3rem auto 0;
  height: 400px;
  background: linear-gradient(135deg, var(--surface) 0%, var(--border-light) 100%);
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: 0.875rem;
  font-family: var(--font-mono);
  overflow: hidden;
}

.article-hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---- Article Body ---- */
.article-body {
  max-width: var(--reading-width);
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

.article-body h2 {
  font-size: 1.75rem;
  margin: 2.5rem 0 1rem;
}

.article-body h3 {
  font-size: 1.35rem;
  margin: 2rem 0 0.75rem;
}

.article-body p {
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text);
}

.article-body ul, .article-body ol {
  margin: 1rem 0 1.5rem 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
  line-height: 1.7;
}

.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--snow);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-secondary);
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--surface);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.article-body pre {
  background: var(--text);
  color: #e0e0e0;
  padding: 1.5rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  line-height: 1.6;
}

.article-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.article-inline-image {
  margin: 2rem 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-light);
}

.article-inline-image .image-placeholder {
  height: 300px;
  background: linear-gradient(135deg, var(--surface) 0%, var(--border-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

.article-inline-image figcaption {
  padding: 0.75rem 1rem;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  text-align: center;
  background: var(--snow);
  border-top: 1px solid var(--border-light);
}

/* ---- Author Bio ---- */
.author-bio {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.5rem;
  background: var(--snow);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  margin: 3rem 0;
}

.author-avatar {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--surface) 0%, var(--border) 100%);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: 0.6rem;
  font-family: var(--font-mono);
  overflow: hidden;
}

.author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.author-info h4 {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.author-info p {
  font-size: 0.85rem !important;
  color: var(--text-secondary);
  margin-bottom: 0 !important;
  line-height: 1.5 !important;
}

/* ---- Article Footer (Copyright + PDF) ---- */
.article-footer {
  margin: 0 0 2rem;
  padding: 1.5rem;
  background: var(--snow);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
}

.article-copyright {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.article-copyright strong {
  color: var(--text-secondary);
}

.article-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-download:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-download svg {
  width: 16px;
  height: 16px;
}

/* ---- Comments ---- */
.comments-section {
  max-width: var(--reading-width);
  margin: 0 auto;
  padding: 0 2rem 4rem;
  border-top: 1px solid var(--border-light);
  padding-top: 3rem;
}

.comments-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.comments-header h3 {
  font-size: 1.35rem;
}

.comments-count {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

.comment-form {
  margin-bottom: 2.5rem;
}

.comment-form textarea {
  width: 100%;
  min-height: 100px;
  padding: 1rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.6;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  resize: vertical;
  transition: border-color var(--transition);
  background: var(--white);
  color: var(--text);
}

.comment-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.comment-form-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 0.75rem;
}

.comment-login-prompt {
  padding: 1.5rem;
  text-align: center;
  background: var(--snow);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  margin-bottom: 2rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.comment-login-prompt a {
  font-weight: 500;
}

.comments-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.comment {
  padding: 1.25rem;
  background: var(--snow);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
}

.comment-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.comment-author-avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
}

.comment-author-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.comment-author-date {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.comment-body {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text);
}

.no-comments {
  text-align: center;
  padding: 2rem;
  color: var(--text-tertiary);
  font-size: 0.95rem;
}

/* ---- Modals ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--white);
  border-radius: var(--radius);
  padding: 2.5rem;
  width: 90%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.modal-overlay.active .modal {
  transform: translateY(0);
}

.modal h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.modal p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.modal-close {
  position: absolute;
  top: 1rem; right: 1rem;
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--text-tertiary);
  padding: 0.25rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
  color: var(--text);
}

.form-group input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
  background: var(--white);
  color: var(--text);
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
}

.form-error {
  font-size: 0.8rem;
  color: var(--error);
  margin-top: 0.75rem;
  display: none;
}

.form-error.visible {
  display: block;
}

.modal-footer {
  margin-top: 1.25rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.modal-footer a { font-weight: 500; cursor: pointer; }

.modal .btn { width: 100%; margin-top: 0.5rem; }

/* ---- Footer ---- */
.footer {
  background: var(--text);
  color: rgba(255,255,255,0.7);
  padding: 4rem 2rem 2rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
}

.footer-brand h3 {
  font-size: 1.25rem;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.6;
  max-width: 280px;
}

.footer-col h4 {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.5);
  margin-bottom: 1rem;
}

.footer-col ul { list-style: none; }

.footer-col li { margin-bottom: 0.5rem; }

.footer-col a {
  color: rgba(255,255,255,0.7);
  font-size: 0.875rem;
  transition: color var(--transition);
}

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

.footer-bottom {
  max-width: var(--max-width);
  margin: 3rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
}

/* ---- Utilities ---- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---- Toast Notifications ---- */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 0.85rem 1.25rem;
  background: var(--text);
  color: var(--white);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  box-shadow: var(--shadow-lg);
  z-index: 3000;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s ease;
}

.toast.visible {
  transform: translateY(0);
  opacity: 1;
}

.toast.error { background: var(--error); }
.toast.success { background: var(--success); }

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .network-nodes { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-auth .btn-ghost { display: none; }
  .mobile-toggle { display: flex; }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--white);
    padding: 1rem 2rem 1.5rem;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
  }

  .hero { padding: 7rem 1.5rem 3rem; }
  .articles-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .pillars { grid-template-columns: 1fr; }
  .network-nodes { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 1.5rem; }
  .footer-bottom { flex-direction: column; gap: 0.5rem; text-align: center; }
  .article-meta { gap: 1rem; }
  .section { padding: 3rem 1.5rem; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 2rem; }
  .modal { padding: 1.75rem; }
}