/* ================================================================
   DR. YUJEN CHANG — Academic Website
   Palette: Deep Navy + Slate + Gold accent
   Fonts: Playfair Display (display) + DM Sans (body)
================================================================ */

:root,
[data-theme='light'] {
  --color-bg: #f5f4f0;
  --color-surface: #ffffff;
  --color-surface-2: #f9f9f7;
  --color-surface-offset: #eeecea;
  --color-divider: #dcdad5;
  --color-border: #d0cec9;

  --color-text: #1a1c2e;
  --color-text-muted: #5a5d72;
  --color-text-faint: #9fa2b4;
  --color-text-inverse: #f5f4f0;

  /* Navy primary */
  --color-primary: #1d3461;
  --color-primary-hover: #152748;
  --color-primary-light: #e8edf5;

  /* Gold accent */
  --color-accent: #c89b3c;
  --color-accent-hover: #a67d28;
  --color-accent-light: #faf3e0;

  --color-navy-deep: #0f1f3d;
  --color-slate: #2d3561;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(26, 28, 46, 0.08);
  --shadow-md: 0 4px 16px rgba(26, 28, 46, 0.10);
  --shadow-lg: 0 12px 40px rgba(26, 28, 46, 0.14);

  --transition: 200ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 680px;
  --content-default: 960px;
  --content-wide: 1200px;

  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.82rem + 0.3vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.125rem);
  --text-2xl: clamp(2rem, 1.4rem + 2vw, 3.25rem);
  --text-hero: clamp(2.5rem, 1rem + 5vw, 5rem);

  --font-display: 'Playfair Display', 'Georgia', serif;
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
}

[data-theme='dark'] {
  --color-bg: #0f1120;
  --color-surface: #161929;
  --color-surface-2: #1d2035;
  --color-surface-offset: #1a1d30;
  --color-divider: #252840;
  --color-border: #2e3150;
  --color-text: #dde0ef;
  --color-text-muted: #8b8fac;
  --color-text-faint: #545870;
  --color-text-inverse: #0f1120;
  --color-primary: #5a7fc7;
  --color-primary-hover: #7a9ad4;
  --color-primary-light: #1e2a45;
  --color-accent: #e8b55a;
  --color-accent-hover: #f0c875;
  --color-accent-light: #2a2218;
  --color-navy-deep: #8aa3d4;
  --color-slate: #a0aec9;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0f1120;
    --color-surface: #161929;
    --color-surface-2: #1d2035;
    --color-surface-offset: #1a1d30;
    --color-divider: #252840;
    --color-border: #2e3150;
    --color-text: #dde0ef;
    --color-text-muted: #8b8fac;
    --color-text-faint: #545870;
    --color-text-inverse: #0f1120;
    --color-primary: #5a7fc7;
    --color-primary-hover: #7a9ad4;
    --color-primary-light: #1e2a45;
    --color-accent: #e8b55a;
    --color-accent-hover: #f0c875;
    --color-accent-light: #2a2218;
    --color-navy-deep: #8aa3d4;
    --color-slate: #a0aec9;
  }
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  text-wrap: balance;
  line-height: 1.2;
  font-family: var(--font-display);
}

p,
li,
figcaption {
  text-wrap: pretty;
}

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

a:hover {
  color: var(--color-primary-hover);
}

button {
  cursor: pointer;
  background: none;
  border: none;
  font: inherit;
  color: inherit;
}

ul[role='list'],
ol[role='list'] {
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

::selection {
  background: rgba(200, 155, 60, 0.2);
  color: var(--color-text);
}

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

/* -------- LAYOUT -------- */
.container {
  width: 100%;
  max-width: 80%;
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.container--narrow {
  max-width: var(--content-narrow);
}

.container--default {
  max-width: var(--content-default);
}

/* -------- HEADER / NAV -------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow var(--transition), transform var(--transition);
}

.site-header--scrolled {
  box-shadow: var(--shadow-md);
}

.site-header--hidden {
  transform: translateY(-100%);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  height: 68px;
  gap: var(--space-6);
}

.nav-logo {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}

.nav-logo__name {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-primary);
}

.nav-logo__title {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  align-items: right;
  gap: var(--space-1);
  list-style: none;
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
}

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

.nav-links a.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
}

.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: right;
  justify-content: right;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: color var(--transition), background var(--transition);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.nav-hamburger {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
}

/* Mobile nav */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--color-surface);
  padding: var(--space-20) var(--space-8) var(--space-8);
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav a {
  font-size: var(--text-lg);
  font-family: var(--font-display);
  color: var(--color-text);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border-bottom: 1px solid var(--color-divider);
  text-decoration: none;
  transition: background var(--transition);
}

.mobile-nav a:hover {
  background: var(--color-surface-offset);
}

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

  .nav-hamburger {
    display: flex;
  }
}

/* -------- HERO -------- */
.hero {
  background: var(--color-primary);
  background-image:
    linear-gradient(135deg, var(--color-navy-deep) 0%, var(--color-primary) 50%, var(--color-slate) 100%);
  color: var(--color-text-inverse);
  padding-block: clamp(var(--space-20), 12vw, var(--space-24));
  position: relative;
  overflow: hidden;
}

[data-theme='dark'] .hero {
  background-image: linear-gradient(135deg, #060a14 0%, #1a2545 50%, #1e2560 100%);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-12);
  align-items: center;
  position: relative;
}

.hero-content {
  max-width: 700px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.hero-eyebrow::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-accent);
  flex-shrink: 0;
}

.hero-name {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 700;
  color: #ffffff;
  line-height: 1.05;
  margin-bottom: var(--space-4);
}

.hero-title {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.75);
  font-weight: 400;
  margin-bottom: var(--space-6);
  line-height: 1.5;
}

.hero-tagline {
  font-size: var(--text-base);
  color: rgba(255, 255, 255, 0.6);
  max-width: 60ch;
  line-height: 1.7;
  margin-bottom: var(--space-10);
  font-style: italic;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.hero-stats {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  align-items: flex-end;
  padding: var(--space-8);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(8px);
  min-width: 160px;
}

.hero-stat {
  text-align: center;
}

.hero-stat__num {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}

.hero-stat__label {
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.55);
  letter-spacing: 0.04em;
  margin-top: var(--space-1);
}

.hero-stat__divider {
  width: 1px;
  height: 24px;
  background: rgba(255, 255, 255, 0.15);
}

@media (max-width: 640px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    flex-direction: row;
    align-items: center;
    min-width: unset;
    width: 100%;
    justify-content: space-around;
  }

  .hero-stat__divider {
    width: 24px;
    height: 1px;
  }
}

/* -------- BUTTONS -------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
  border: 2px solid transparent;
  line-height: 1.4;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--color-accent);
  color: #1a1c2e;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  box-shadow: 0 4px 16px rgba(200, 155, 60, 0.35);
}

.btn--outline {
  background: transparent;
  color: rgba(255, 255, 255, 0.85);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn--outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
  color: #fff;
}

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--ghost:hover {
  background: var(--color-primary-light);
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

/* -------- SECTION STRUCTURE -------- */
section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.section-label::before {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-accent);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  line-height: 1.2;
}

.section-subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 60ch;
  line-height: 1.7;
  margin-bottom: var(--space-12);
}

.section-header {
  margin-bottom: var(--space-12);
}

/* -------- ABOUT -------- */
.about-section {
  background: var(--color-surface);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: clamp(var(--space-10), 6vw, var(--space-20));
  align-items: start;
}

.about-text p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
  font-size: var(--text-base);
  line-height: 1.75;
  max-width: 70ch;
}

.about-text p:last-child {
  margin-bottom: 0;
}

.about-sidebar {}

.profile-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
}

.profile-avatar {
  width: 90px;
  height: 90px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: white;
}

.profile-card__name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.profile-card__role {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
  line-height: 1.5;
}

.profile-card__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.profile-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.profile-link:hover {
  color: var(--color-primary);
}

.profile-link svg {
  flex-shrink: 0;
  opacity: 0.6;
}

.interests-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-8);
}

.interests-card h3 {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.interest-tag {
  display: inline-block;
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-3);
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  margin: var(--space-1);
  font-weight: 500;
}

/* -------- EDUCATION / POSITIONS -------- */
.edu-section {
  background: var(--color-bg);
}

.two-col-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.timeline-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--space-4);
  align-items: start;
}

.timeline-dot {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  border: 2px solid var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.timeline-dot svg {
  color: var(--color-primary);
}

.timeline-body {}

.timeline-year {
  font-size: var(--text-xs);
  color: var(--color-accent);
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 2px;
}

.timeline-degree {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 2px;
}

.timeline-inst {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.timeline-loc {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* -------- RESEARCH -------- */
.research-section {
  background: var(--color-surface);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.research-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.research-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition);
}

.research-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  border-color: var(--color-primary);
}

.research-card:hover::before {
  opacity: 1;
}

.research-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
}

.research-icon svg {
  color: var(--color-primary);
}

.research-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.research-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* -------- PUBLICATIONS -------- */
.publications-section {
  background: var(--color-bg);
}

.pubs-filter {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-10);
}

.filter-btn {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  background: var(--color-surface);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition);
}

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

.pub-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.pub-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-8);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-4);
  align-items: start;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.pub-item:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.pub-year {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-2);
}

.pub-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
  line-height: 1.4;
}

.pub-authors {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.pub-authors strong {
  color: var(--color-primary);
}

.pub-journal {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-style: italic;
}

.pub-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
  padding: var(--space-2) var(--space-3);
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
  flex-shrink: 0;
  align-self: start;
}

.pub-link:hover {
  background: var(--color-primary);
  color: white;
}

.pub-metrics {
  display: flex;
  gap: var(--space-8);
  margin-top: var(--space-10);
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.pub-metric {
  text-align: center;
}

.pub-metric__num {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}

.pub-metric__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* -------- TEACHING -------- */
.teaching-section {
  background: var(--color-surface);
}

.teaching-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-5);
}

.course-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-7);
  transition: box-shadow var(--transition), transform var(--transition);
}

.course-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.course-badge {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.course-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.course-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* -------- PROJECTS -------- */
.projects-section {
  padding: var(--space-24) 0;
  background: var(--color-bg-alt);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
  margin-top: var(--space-12);
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-decoration: none;
  color: inherit;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  position: relative;
}

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

.project-card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-light, rgba(29, 52, 97, 0.08));
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition);
}

[data-theme="dark"] .project-card__icon {
  background: rgba(200, 155, 60, 0.12);
  color: var(--color-accent);
}

.project-card:hover .project-card__icon {
  background: rgba(200, 155, 60, 0.15);
  color: var(--color-accent);
}

.project-card__body {
  flex: 1;
}

.project-card__tag {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.project-card__title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  line-height: 1.3;
}

.project-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

.project-card__arrow {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  color: var(--color-text-muted);
  opacity: 0;
  transition: opacity var(--transition), color var(--transition);
}

.project-card:hover .project-card__arrow {
  opacity: 1;
  color: var(--color-accent);
}

@media (max-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

/* -------- SERVICE -------- */
.service-section {
  background: var(--color-bg);
}

.service-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: 720px;
}

.service-item {
  display: flex;
  gap: var(--space-4);
  align-items: start;
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.service-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  flex-shrink: 0;
  margin-top: 6px;
}

.service-item h4 {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 2px;
}

.service-item p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* -------- FOOTER -------- */
.site-footer {
  background: var(--color-navy-deep);
  color: rgba(255, 255, 255, 0.5);
  padding-block: var(--space-10);
  font-size: var(--text-xs);
}

[data-theme='dark'] .site-footer {
  background: #060a14;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: rgba(255, 255, 255, 0.7);
}

.footer-links {
  display: flex;
  gap: var(--space-5);
  list-style: none;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.4);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: rgba(255, 255, 255, 0.8);
}

/* -------- RESPONSIVE -------- */
@media (max-width: 900px) {

  .about-grid,
  .two-col-grid {
    grid-template-columns: 1fr;
  }

  .about-sidebar {
    order: -1;
  }
}

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

  .pub-metrics {
    flex-wrap: wrap;
    gap: var(--space-6);
  }

  .hero-stats {
    display: none;
  }
}