/* ==========================================================================
   Design Tokens
   ========================================================================== */
:root {
  /* Neutrals */
  --color-primary: #2b2b2b;
  --color-primary-light: #444;
  --color-primary-hover: #555;
  --color-text: #2f2f2f;
  --color-text-muted: #555;
  --color-text-light: #6b6b6b;
  --color-bg: #f6f5f3;          /* flat, warm off-white */
  --color-bg-alt: #fbfbfa;
  --color-white: #fff;
  --color-surface: #fff;
  --color-border: #e7e4df;
  --color-border-light: #ddd;
  --color-border-input: #c9c6c0;

  /* Accent (Razorback red) */
  --color-accent: #9D2235;
  --color-accent-light: #b22d42;
  --color-accent-dark: #7c1b2a;
  --color-accent-subtle: rgba(157, 34, 53, 0.08);
  --color-accent-border: rgba(157, 34, 53, 0.22);

  /* Spacing */
  --space-xs: 0.375rem;
  --space-sm: 0.625rem;
  --space-md: 0.75rem;
  --space-base: 1rem;
  --space-lg: 1.125rem;
  --space-xl: 1.25rem;
  --space-2xl: 1.5rem;
  --space-3xl: 1.75rem;
  --space-4xl: 2rem;
  --space-5xl: 2.5rem;
  --space-6xl: 3.5rem;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.875rem;
  --radius-full: 999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(16, 18, 22, 0.05);
  --shadow-card: 0 1px 2px rgba(16, 18, 22, 0.04), 0 8px 24px rgba(16, 18, 22, 0.07);
  --shadow-hover: 0 6px 14px rgba(16, 18, 22, 0.08), 0 16px 36px rgba(16, 18, 22, 0.10);

  /* Typography */
  --font-family: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-family-heading: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --line-height: 1.6;
  --line-height-relaxed: 1.7;
  --line-height-loose: 1.8;

  --font-size-sm: 0.9rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.0625rem;
  --fs-h4: 1.1rem;
  --fs-h3: 1.3rem;
  --fs-h2: 1.7rem;
  --fs-hero: 2.4rem;

  /* Components */
  --card-pad-y: 1.35rem;
  --card-pad-x: 1.5rem;
  --header-h: 3.875rem;

  /* Layout */
  --max-width-content: 1040px;
  --max-width-container: 1200px;
  --max-width-text: 68ch;
  --max-width-form: 600px;
  --max-width-post: 760px;
}

/* ==========================================================================
   Base
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: var(--line-height);
  margin: 0;
  padding: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-family-heading);
  color: var(--color-primary);
  line-height: 1.22;
}

h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); }

p { margin: 0 0 var(--space-base); }

a {
  color: var(--color-accent);
  transition: color 0.2s;
}

a:hover {
  color: var(--color-accent-light);
}

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

main {
  display: block;
}

/* Visible focus ring for keyboard users (global, token-based) */
:where(a, button, input, textarea, select, [tabindex]):focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   Header / Top Bar
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(160%) blur(8px);
  -webkit-backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 0 0 var(--color-accent), 0 4px 14px rgba(16, 18, 22, 0.05);
}

.site-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
  width: 90%;
  max-width: var(--max-width-container);
  min-height: var(--header-h);
  margin: 0 auto;
  padding: 0 var(--space-base);
}

.site-brand {
  font-family: var(--font-family-heading);
  font-weight: 700;
  font-size: 1.18rem;
  letter-spacing: 0.01em;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
}

.site-brand:hover {
  color: var(--color-accent);
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-header nav a {
  position: relative;
  color: var(--color-text-muted);
  padding: 0.45rem 0.7rem;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background-color 0.2s;
}

.site-header nav a::after {
  content: '';
  position: absolute;
  left: 0.7rem;
  right: 0.7rem;
  bottom: 0.15rem;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s ease;
}

.site-header nav a:hover {
  color: var(--color-primary);
}

.site-header nav a:hover::after {
  transform: scaleX(1);
}

.site-header nav a.active {
  color: var(--color-accent);
}

.site-header nav a.active::after {
  transform: scaleX(1);
}

/* Hamburger toggle (mobile only) */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
  width: 2.75rem;
  height: 2.5rem;
}

.nav-toggle:hover {
  background: var(--color-bg-alt);
}

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 1.375rem;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.15s ease, background-color 0.15s ease;
}

.nav-toggle-bars {
  position: relative;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: '';
  position: absolute;
  left: 0;
}

.nav-toggle-bars::before { top: -0.4375rem; }
.nav-toggle-bars::after  { top: 0.4375rem; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ==========================================================================
   Layout
   ========================================================================== */
.container {
  width: 90%;
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: var(--space-base);
}

section {
  padding: var(--space-5xl) 0;
}

/* Shared interior page-title with static accent underline */
.page-title {
  font-size: var(--fs-h2);
  margin: 0 0 var(--space-base);
  padding-bottom: var(--space-sm);
  position: relative;
}

.page-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 2.5rem;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
}

/* Shared section intro paragraph */
.lede,
.home-lede,
.about-lede,
.research-lede,
.services-lede,
.portfolio-lede,
.teaching-lede,
.blog-lede,
.report-lede {
  max-width: var(--max-width-text);
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-text);
}

/* ==========================================================================
   Skip Link
   ========================================================================== */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: 200;
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-sm) var(--space-base);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  position: fixed;
  top: 0;
  left: var(--space-base);
  width: auto;
  height: auto;
  overflow: visible;
  color: #fff;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-block;
  margin-top: var(--space-md);
  padding: 0.55rem 1.05rem;
  border: 1.5px solid var(--color-accent);
  border-radius: var(--radius-md);
  background: transparent;
  text-decoration: none;
  cursor: pointer;
  color: var(--color-accent);
  font-weight: 600;
  font-size: var(--font-size-base);
  line-height: 1.3;
  transition: background-color 0.2s, color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.btn:hover {
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(157, 34, 53, 0.24);
  transform: translateY(-1px);
}

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

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

form button.btn,
form button {
  padding: 0.6rem 1.05rem;
  border: 1.5px solid var(--color-accent);
  border-radius: var(--radius-md);
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

form button.btn:hover,
form button:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  box-shadow: 0 4px 12px rgba(157, 34, 53, 0.24);
  transform: translateY(-1px);
}

/* ==========================================================================
   Cards (one family across the whole site)
   ========================================================================== */
.card,
.paper-card,
.project-card,
.post-card,
.course-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--card-pad-y) var(--card-pad-x);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.25s, border-color 0.25s, transform 0.25s;
}

.card:hover,
.paper-card:hover,
.project-card:hover,
.post-card:hover,
.course-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-accent-border);
}

.card h2,
.card h3 {
  margin-top: 0;
  margin-bottom: var(--space-sm);
  font-size: var(--fs-h3);
}

.card ul {
  margin: 0;
  padding-left: var(--space-lg);
}

.card li {
  margin-bottom: 0.3rem;
}

/* Accent-left treatment for editorial cards */
.paper-card,
.project-card,
.course-card {
  border-left: 3px solid var(--color-border);
}

.paper-card:hover,
.project-card:hover,
.course-card:hover {
  border-left-color: var(--color-accent);
}

/* ==========================================================================
   Forms
   ========================================================================== */
form {
  display: flex;
  flex-direction: column;
  max-width: var(--max-width-form);
  margin: 0 auto;
}

.form-card label {
  display: block;
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
  font-weight: 600;
}

.form-card input,
.form-card textarea {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border-input);
  border-radius: var(--radius-md);
  font: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-card input:focus,
.form-card textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

.form-card textarea {
  resize: vertical;
}

.form-subtext {
  color: var(--color-text-muted);
  margin-top: 0;
}

/* ==========================================================================
   Tables (base)
   ========================================================================== */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-md);
}

th,
td {
  border: 1px solid var(--color-border-light);
  padding: var(--space-sm);
  text-align: left;
}

thead th {
  background: var(--color-accent-subtle);
  font-family: var(--font-family-heading);
  text-transform: uppercase;
  font-size: var(--font-size-sm);
  letter-spacing: 0.03em;
}

tbody tr:nth-child(even) {
  background: var(--color-bg-alt);
}

/* ==========================================================================
   Home
   ========================================================================== */
.home {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.home-hero {
  display: grid;
  grid-template-columns: 14rem minmax(0, 1fr);
  gap: var(--space-5xl);
  align-items: center;
  margin-top: var(--space-md);
}

.home-photo-wrap {
  margin: 0;
}

.home-photo {
  display: block;
  width: 14rem;
  aspect-ratio: 4 / 5;
  height: auto;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--radius-lg);
  box-shadow: 0 0 0 1px var(--color-border), var(--shadow-card);
}

.home-content {
  min-width: 0;
}

.home-eyebrow {
  margin: 0 0 var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.home-title {
  margin: 0 0 var(--space-md);
  font-size: var(--fs-hero);
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.home-lede {
  margin-top: 0;
}

.home-actions {
  margin-top: var(--space-xl);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.home-actions .btn {
  margin-top: 0;
}

.home-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-base);
  margin: var(--space-2xl) 0 0;
  max-width: var(--max-width-text);
}

.home-stats .stat {
  padding: var(--space-base) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.stat-value {
  font-family: var(--font-family-heading);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.1;
}

.stat-label {
  margin: var(--space-xs) 0 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.4;
}

.stat-source {
  display: block;
  font-size: 0.82rem;
  color: var(--color-text-light);
  margin-top: 0.2rem;
}

/* ==========================================================================
   About
   ========================================================================== */
.about {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.about-grid {
  display: grid;
  grid-template-columns: 17rem 1fr;
  gap: var(--space-5xl);
  align-items: start;
}

.about-photo-wrap {
  margin: 0;
  position: sticky;
  top: calc(var(--header-h) + var(--space-base));
}

.about-photo {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: 0 0 0 1px var(--color-border), var(--shadow-card);
}

.about-content {
  min-width: 0;
}

.about-content .page-title {
  margin-top: 0;
}

.about-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-base);
  margin-top: var(--space-xl);
}

.quick-facts {
  margin-top: var(--space-xl);
  padding: var(--space-base) var(--space-lg);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-lg);
  background: var(--color-bg-alt);
  display: grid;
  gap: var(--space-xs);
  max-width: var(--max-width-text);
}

.about-cta {
  margin-top: var(--space-xl);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-base);
}

.about-cta .btn {
  margin-top: 0;
}

/* ==========================================================================
   Research
   ========================================================================== */
.research {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.research h3,
.section-heading {
  margin-top: var(--space-5xl);
  margin-bottom: var(--space-base);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
}

.paper-list {
  display: grid;
  gap: var(--space-base);
}

.paper-card h3 {
  margin-top: 0;
  margin-bottom: var(--space-sm);
  font-size: var(--fs-h4);
}

.paper-authors {
  color: var(--color-text-muted);
  margin: 0 0 0.3rem;
}

.paper-venue {
  font-style: italic;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-sm);
}

.paper-venue strong {
  font-style: normal;
}

.paper-tag {
  display: inline-block;
  font-style: normal;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  border: 1px solid var(--color-accent-border);
  border-radius: var(--radius-full);
  padding: 0.1rem 0.6rem;
  margin-left: 0.4rem;
  vertical-align: middle;
}

.paper-abstract {
  line-height: var(--line-height-relaxed);
  margin: 0 0 var(--space-base);
}

.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.paper-links .btn {
  margin-top: 0;
}

.wip-list {
  padding-left: var(--space-xl);
  line-height: var(--line-height-relaxed);
}

.wip-list li {
  margin-bottom: var(--space-sm);
}

.wip-list .wip-meta {
  color: var(--color-text-light);
}

/* CV-style publications list (terse citations) */
.pub-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-md);
  max-width: var(--max-width-text);
}

.pub-list li {
  line-height: var(--line-height-relaxed);
  padding-left: var(--space-base);
  border-left: 2px solid var(--color-border);
}

.pub-venue {
  font-style: italic;
  color: var(--color-text-muted);
}

.pub-links {
  font-size: var(--font-size-sm);
  font-weight: 600;
  white-space: nowrap;
}

.pub-note {
  margin-top: var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  max-width: var(--max-width-text);
}

/* ==========================================================================
   Services
   ========================================================================== */
.services {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.services-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.85fr;
  gap: var(--space-2xl);
  align-items: start;
  margin-top: var(--space-xl);
}

.services-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-base);
  margin-top: var(--space-base);
}

.service-list {
  margin: 0;
  padding-left: var(--space-lg);
}

.service-list li {
  margin-bottom: var(--space-md);
}

.social-proof {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.social-proof p {
  margin: 0 0 var(--space-sm);
}

.client-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-xl);
  list-style: none;
  margin: 0;
  padding: 0;
}

.client-list li {
  color: var(--color-text-muted);
  position: relative;
  padding-left: var(--space-base);
}

.client-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-accent);
}

.contact-info {
  margin-top: var(--space-base);
}

/* ==========================================================================
   CV
   ========================================================================== */
.cv,
.report {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.doc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin: var(--space-base) 0;
}

.doc-actions .btn {
  margin-top: 0;
}

.cv-frame {
  margin-top: var(--space-base);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 82vh;
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.cv-frame iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.cv-fallback {
  margin-top: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ==========================================================================
   Reports (portfolio detail pages)
   ========================================================================== */
.report-meta {
  color: var(--color-text-muted);
  max-width: var(--max-width-text);
}

.report-facts {
  margin-top: var(--space-base);
}

.back-link {
  display: inline-block;
  margin-bottom: var(--space-base);
  font-weight: 600;
  font-size: var(--font-size-sm);
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}

.report-footer {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.report-footer .btn {
  margin-top: 0;
}

/* ==========================================================================
   Teaching
   ========================================================================== */
.teaching {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.course-list {
  display: grid;
  gap: var(--space-base);
  margin-top: var(--space-base);
}

.course-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-base);
  align-items: start;
}

.course-card h2 {
  margin: 0 0 var(--space-xs);
  font-size: var(--fs-h4);
}

.course-meta {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem var(--space-md);
}

.course-meta .course-role {
  font-weight: 600;
  color: var(--color-text);
}

.course-card p:last-child {
  margin-bottom: 0;
}

.course-eval {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.rating-pill {
  align-self: center;
  white-space: nowrap;
  font-family: var(--font-family-heading);
  font-weight: 700;
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  border: 1px solid var(--color-accent-border);
  border-radius: var(--radius-full);
  padding: 0.3rem 0.75rem;
  font-size: var(--font-size-sm);
}

.rating-pill .rating-label {
  display: block;
  font-family: var(--font-family);
  font-weight: 600;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-light);
}

.teaching-note {
  margin-top: var(--space-xl);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ==========================================================================
   Portfolio
   ========================================================================== */
.portfolio {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-base);
  margin-top: var(--space-base);
}

.project-card {
  display: flex;
  flex-direction: column;
}

.project-card h2 {
  margin-top: 0;
  margin-bottom: 0.2rem;
  font-size: var(--fs-h4);
}

.project-org {
  margin: 0 0 var(--space-sm);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-style: italic;
}

.project-tags {
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.project-tags li {
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-full);
  padding: 0.2rem var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  transition: background-color 0.2s, color 0.2s, border-color 0.2s;
}

.project-tags li:hover {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  border-color: var(--color-accent-border);
}

.project-links {
  margin-top: auto;
  padding-top: var(--space-base);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.project-links .btn {
  margin-top: 0;
}

/* ==========================================================================
   Blog
   ========================================================================== */
.blog {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.post-list {
  display: grid;
  gap: var(--space-xl);
  margin-top: var(--space-xl);
}

.post-card h2 {
  margin-top: 0;
  margin-bottom: 0.4rem;
  font-size: var(--fs-h3);
}

.post-card h2 a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

.post-card h2 a:hover {
  color: var(--color-accent);
}

.post-meta {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  margin: 0 0 var(--space-md);
}

.post-excerpt {
  margin: 0 0 var(--space-base);
  line-height: var(--line-height);
}

.post-card .btn {
  margin-top: 0;
}

/* ==========================================================================
   Blog Post
   ========================================================================== */
.blog-post {
  max-width: var(--max-width-post);
  margin: 0 auto;
}

.post-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-base);
  border-bottom: 1px solid var(--color-border);
}

.post-header h1,
.post-header h2 {
  margin: 0 0 0.4rem;
}

.post-content {
  line-height: var(--line-height-loose);
}

.post-content h2 {
  margin-top: var(--space-4xl);
  margin-bottom: var(--space-md);
}

.post-content ul,
.post-content ol {
  margin: var(--space-base) 0;
  padding-left: var(--space-2xl);
}

.post-content li {
  margin-bottom: 0.5rem;
}

.post-footer {
  margin-top: var(--space-5xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.reading-time {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  margin-top: var(--space-6xl);
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
}

.site-footer-inner {
  width: 90%;
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-base);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.footer-copy {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 600;
}

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

/* ==========================================================================
   Back-to-Top
   ========================================================================== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 99;
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-full);
  border: none;
  background: var(--color-accent);
  color: #fff;
  font-size: 1.25rem;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 0.3s, transform 0.3s, background-color 0.2s;
  box-shadow: 0 6px 16px rgba(157, 34, 53, 0.32);
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
}

/* ==========================================================================
   Scroll Reveal (JS-gated so content is always visible without/before JS)
   ========================================================================== */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.js [data-reveal].visible {
  opacity: 1;
  transform: translateY(0);
}

.js [data-reveal]:nth-child(2) { transition-delay: 0.06s; }
.js [data-reveal]:nth-child(3) { transition-delay: 0.12s; }
.js [data-reveal]:nth-child(4) { transition-delay: 0.18s; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .home-hero {
    grid-template-columns: 12rem minmax(0, 1fr);
    gap: var(--space-4xl);
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-header nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-card);
    padding: var(--space-xs) 0;
  }

  .site-header nav.is-open {
    display: flex;
  }

  .site-header nav a {
    padding: var(--space-md) var(--space-xl);
    border-radius: 0;
    border-left: 3px solid transparent;
  }

  .site-header nav a::after {
    display: none;
  }

  .site-header nav a.active {
    border-left-color: var(--color-accent);
    background: var(--color-accent-subtle);
  }

  .container {
    width: 94%;
    padding: var(--space-sm);
  }

  .home-hero {
    grid-template-columns: 1fr;
    justify-items: start;
    gap: var(--space-2xl);
    margin-top: var(--space-sm);
  }

  .home-photo {
    width: 10rem;
  }

  .home-title {
    font-size: 2rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .about-photo-wrap {
    position: static;
    max-width: 15rem;
  }

  .about-cards {
    grid-template-columns: 1fr;
  }

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

  .services-cards {
    grid-template-columns: 1fr;
  }

  .cv-frame {
    height: 70vh;
  }
}

@media (max-width: 600px) {
  .project-grid {
    grid-template-columns: 1fr;
  }

  .home-stats {
    grid-template-columns: 1fr;
  }

  .course-card {
    grid-template-columns: 1fr;
  }

  .rating-pill {
    justify-self: start;
  }

  .cv-frame {
    height: 60vh;
  }

  .footer-links {
    gap: var(--space-base);
  }
}

/* ==========================================================================
   Reduced Motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .site-header nav a::after,
  .nav-toggle-bars,
  .nav-toggle-bars::before,
  .nav-toggle-bars::after,
  .btn,
  .card,
  .paper-card,
  .project-card,
  .post-card,
  .course-card,
  .back-to-top {
    transition: none;
  }
}