/* ============================
   SMARTS LAB — DESIGN TOKENS
   ============================ */

:root {
  /* Type Scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);

  /* Spacing */
  --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;
  --space-32: 8rem;

  /* Fonts */
  --font-display: 'Cabinet Grotesk', 'Inter', sans-serif;
  --font-body: 'General Sans', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.25rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

/* ============================
   COLOR SCHEME — Academic/Tech with MSU Green Accent
   ============================ */

:root,
[data-theme="light"] {
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-surface-2: #f3f4f6;
  --color-surface-offset: #eef0f2;
  --color-divider: #e2e5e9;
  --color-border: #d1d5db;
  --color-text: #111827;
  --color-text-muted: #6b7280;
  --color-text-faint: #9ca3af;
  --color-text-inverse: #f9fafb;
  --color-accent: #18453b;
  --color-accent-hover: #0f2d26;
  --color-accent-highlight: rgba(24, 69, 59, 0.08);
  --color-accent-light: #2d8a6e;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
  --hero-bg: linear-gradient(135deg, #18453b 0%, #1e5a4d 40%, #18453b 100%);
}

[data-theme="dark"] {
  --color-bg: #0f1114;
  --color-surface: #1a1d22;
  --color-surface-2: #22262c;
  --color-surface-offset: #171a1e;
  --color-divider: #2a2e35;
  --color-border: #363b44;
  --color-text: #e5e7eb;
  --color-text-muted: #9ca3af;
  --color-text-faint: #6b7280;
  --color-text-inverse: #111827;
  --color-accent: #4ade80;
  --color-accent-hover: #86efac;
  --color-accent-highlight: rgba(74, 222, 128, 0.1);
  --color-accent-light: #86efac;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
  --hero-bg: linear-gradient(135deg, #070a08 0%, #0b140f 40%, #080d0a 100%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0f1114;
    --color-surface: #1a1d22;
    --color-surface-2: #22262c;
    --color-surface-offset: #171a1e;
    --color-divider: #2a2e35;
    --color-border: #363b44;
    --color-text: #e5e7eb;
    --color-text-muted: #9ca3af;
    --color-text-faint: #6b7280;
    --color-text-inverse: #111827;
    --color-accent: #4ade80;
    --color-accent-hover: #86efac;
    --color-accent-highlight: rgba(74, 222, 128, 0.1);
    --color-accent-light: #86efac;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
    --hero-bg: linear-gradient(135deg, #070a08 0%, #0b140f 40%, #080d0a 100%);
  }
}

/* ============================
   BASE RESET
   ============================ */

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.15; }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }

a, button, [role="button"], [role="link"], input, textarea, select {
  transition: color var(--transition-interactive), background var(--transition-interactive),
    border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}

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

::selection {
  background: var(--color-accent-highlight);
  color: var(--color-text);
}

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

button { cursor: pointer; background: none; border: none; }

/* ============================
   LAYOUT UTILITIES
   ============================ */

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

.section-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
  font-weight: 500;
}

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

.section-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 60ch;
  margin-bottom: var(--space-10);
}

/* ============================
   BUTTONS
   ============================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: all var(--transition-interactive);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-text-inverse);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
}

/* ============================
   HEADER
   ============================ */

.header {
  position: sticky;
  top: 0;
  z-index: 220;
  background: oklch(from var(--color-bg) l c h / 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

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

.header-inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-3) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
}
.logo:hover { color: var(--color-accent); }
.logo-mark {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  object-fit: contain;
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  gap: var(--space-1);
}

.nav-link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: color var(--transition-interactive), background var(--transition-interactive);
}
.nav-link:hover {
  color: var(--color-text);
  background: var(--color-accent-highlight);
}

.nav-link.active,
.nav-link[aria-current="page"] {
  color: var(--color-text);
  background: var(--color-accent-highlight);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-accent-highlight);
}

.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  position: relative;
  z-index: 200;
  transition: color var(--transition-interactive);
}
.mobile-menu-btn:hover { color: var(--color-text); }

/* Hamburger bars — CSS-animated, no SVG swap needed */
.hamburger {
  width: 22px;
  height: 16px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.25s ease;
  transform-origin: center;
}

/* Animated X state */
.mobile-menu-btn.active .hamburger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-menu-btn.active .hamburger span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.mobile-menu-btn.active .hamburger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile overlay backdrop */
.mobile-overlay {
  display: none;
}

@media (max-width: 768px) {
  .mobile-menu-btn { display: flex; }

  /* Overlay backdrop */
  .mobile-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: transparent;
    z-index: 140;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s ease;
  }
  .mobile-overlay.visible {
    opacity: 1;
    pointer-events: auto;
  }

  /* Slide-in panel */
  .nav {
    position: fixed;
    top: 0;
    right: 0;
    width: min(300px, 80vw);
    height: 100vh;
    height: 100dvh;
    background: var(--color-surface-2);
    border-left: 1px solid var(--color-divider);
    z-index: 150;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-20) var(--space-6) var(--space-8);
    box-shadow: -8px 0 40px rgba(0,0,0,0.25);
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    pointer-events: none;
  }
  .nav.open {
    transform: translateX(0);
    pointer-events: auto;
  }

  /* Bigger tap targets on mobile */
  .nav .nav-link {
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--color-text);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    transition: color var(--transition-interactive),
                background var(--transition-interactive);
  }

  /* Active link indicator */
  .nav .nav-link:hover,
  .nav .nav-link:active {
    background: var(--color-accent-highlight);
    color: var(--color-text);
  }

  /* Lock body scroll when menu is open */
  body.menu-open {
    overflow: hidden;
  }
}

/* ============================
   HERO
   ============================ */

.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--hero-bg);
  color: #e5e7eb;
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, black 20%, transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: var(--space-16) var(--space-6);
  max-width: 800px;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: #86efac;
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid rgba(74, 222, 128, 0.2);
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-6);
  color: #ffffff;
  line-height: 1.05;
}

.hero-subtitle {
  font-size: var(--text-base);
  color: #9ca3af;
  max-width: 55ch;
  margin-inline: auto;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-12);
}

.hero .btn-primary {
  background: #4ade80;
  color: #0b1d18;
}
.hero .btn-primary:hover {
  background: #86efac;
  color: #0b1d18;
}
.hero .btn-ghost {
  color: #d1d5db;
  border-color: rgba(255,255,255,0.2);
}
.hero .btn-ghost:hover {
  color: #ffffff;
  border-color: rgba(255,255,255,0.4);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-12);
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255,255,255,0.08);
  transition: transform 0.3s ease;
}

.stat:hover {
  transform: translateY(-2px);
}

.stat-number {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: #ffffff;
}

.stat-label {
  font-size: var(--text-xs);
  color: #6b7280;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  color: #4b5563;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ============================
   FACULTY
   ============================ */

.faculty-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

.faculty-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

.faculty-role {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.faculty-dept {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  line-height: 1.6;
}

.faculty-bio {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.faculty-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.faculty-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-interactive);
}
.faculty-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-highlight);
}

.expertise-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.expertise-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 500;
  padding: var(--space-1) var(--space-3);
  background: var(--color-accent-highlight);
  color: var(--color-accent);
  border-radius: var(--radius-full);
  border: 1px solid transparent;
}

@media (max-width: 768px) {
  .faculty-layout { grid-template-columns: 1fr; gap: var(--space-8); }
}

/* ============================
   RESEARCH
   ============================ */

.research-area {
  margin-bottom: var(--space-16);
}
.research-area:last-child { margin-bottom: 0; }

.research-area-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: center;
  margin-bottom: var(--space-8);
}

.research-area-header--reversed {
  direction: rtl;
}
.research-area-header--reversed > * {
  direction: ltr;
}

.research-area-number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
  display: block;
  margin-bottom: var(--space-2);
}

.research-area-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.research-area-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.research-area-image {
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 16/10;
}

.research-area-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (max-width: 768px) {
  .research-area-header {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  .research-area-header--reversed {
    direction: ltr;
  }
}

/* Project Cards */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-4);
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-interactive);
}

.project-card--immediate {
  opacity: 1 !important;
  transform: none !important;
  transition: all var(--transition-interactive) !important;
}

.research-area--immediate {
  opacity: 1 !important;
  transform: none !important;
  transition: none !important;
}

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

.project-card--featured {
  border-color: var(--color-accent);
  background: var(--color-accent-highlight);
}

.project-card-badge {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-3);
}

.project-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.project-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-3);
}

/* Project card images */
.project-card-img {
  width: 100%;
  height: 220px;
  display: block;
  object-fit: contain;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

.project-card--has-img {
  padding-top: 0;
  overflow: hidden;
}
.project-card--has-img .project-card-img {
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  margin-left: calc(-1 * var(--space-6));
  margin-right: calc(-1 * var(--space-6));
  width: calc(100% + var(--space-6) * 2);
  max-width: none;
  height: 220px;
  object-fit: contain;
  background: var(--color-surface-2, rgba(0,0,0,0.12));
  margin-bottom: var(--space-4);
}
.project-card--has-img .project-card-badge,
.project-card--has-img h4,
.project-card--has-img p,
.project-card--has-img .project-card-links {
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}
.project-card--has-img .project-card-links {
  padding-bottom: var(--space-2);
}

.project-link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
}
.project-link:hover {
  text-decoration: underline;
}

/* ============================
   PUBLICATIONS
   ============================ */

.publications-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.pub-item {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  gap: var(--space-4);
  align-items: baseline;
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-divider);
  transition: background var(--transition-interactive);
}
.pub-item:first-child { border-top: 1px solid var(--color-divider); }

.pub-year {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 500;
}

.pub-title {
  font-size: var(--text-sm);
  font-weight: 600;
  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-1);
}

.pub-venue {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
  font-weight: 500;
}

.pub-link {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  text-decoration: none;
  white-space: nowrap;
  transition: all var(--transition-interactive);
}
.pub-link:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-highlight);
}

.pub-more {
  margin-top: var(--space-8);
  text-align: center;
}

@media (max-width: 640px) {
  .pub-item {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }
  .pub-year { font-size: var(--text-xs); }
}

/* ============================
   TEAM
   ============================ */

/* Team page hero with group photo background — moved after .page-hero for specificity */

.team-group {
  margin-bottom: var(--space-10);
}
.team-group:last-child { margin-bottom: 0; }

.team-group-title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-divider);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-3);
}

.team-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-5) var(--space-4);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  transition: all var(--transition-interactive);
}
.team-card:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.team-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-accent-highlight);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.team-card h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.team-link {
  font-size: var(--text-xs);
  color: var(--color-accent);
  text-decoration: none;
}
.team-link:hover { text-decoration: underline; }

.team-degree {
  font-size: var(--text-xs);
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-1);
}

.team-past-role {
  font-size: var(--text-xs);
  color: var(--color-muted);
  margin-bottom: var(--space-1);
  font-style: italic;
}

.past-member {
  opacity: 0.85;
}
.past-member:hover {
  opacity: 1;
}

/* ============================
   DATASETS
   ============================ */

.dataset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}

.dataset-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: all var(--transition-interactive);
}
.dataset-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--color-text);
}

/* Dataset card with image */
.dataset-card--has-img {
  padding: 0;
  overflow: hidden;
}
.dataset-card-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
}
.dataset-card--has-img h4,
.dataset-card--has-img p,
.dataset-card--has-img .dataset-source {
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}
.dataset-card--has-img h4 {
  padding-top: var(--space-4);
}
.dataset-card--has-img .dataset-source {
  padding-bottom: var(--space-6);
}

.dataset-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-accent-highlight);
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.dataset-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.dataset-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: var(--space-3);
  flex-grow: 1;
}

.dataset-source {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
  font-weight: 500;
}

/* ============================
   TEACHING
   ============================ */

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  gap: var(--space-4);
}

.course-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.course-code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-accent-highlight);
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
}

.course-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.course-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

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

/* ============================
   POSITIONS
   ============================ */

.positions-banner {
  background: var(--color-accent-highlight);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.positions-text p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.7;
}

.positions-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

@media (max-width: 768px) {
  .positions-banner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ============================
   CONTACT
   ============================ */

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

.contact-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  margin-top: var(--space-6);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.6;
}
.contact-item svg { flex-shrink: 0; margin-top: 2px; color: var(--color-accent); }
.contact-item a {
  color: var(--color-text);
  text-decoration: none;
}
.contact-item a:hover { color: var(--color-accent); }

.contact-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-self: center;
}

.contact-link-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition-interactive);
}
.contact-link-card:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-highlight);
  color: var(--color-text);
  transform: translateX(4px);
}
.contact-link-card svg { color: var(--color-text-faint); }

@media (max-width: 768px) {
  .contact-layout { grid-template-columns: 1fr; gap: var(--space-8); }
}

/* ============================
   FOOTER
   ============================ */

.footer {
  background: var(--color-surface-offset);
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
  text-align: center;
}

.footer-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
}

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

.footer-links {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
.footer-links a:hover { color: var(--color-accent); }

.footer-legal {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  max-width: 60ch;
}

/* ============================
   SCROLL ANIMATIONS
   ============================ */

.fade-in { opacity: 1; }

@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 80%;
  }
}

@keyframes reveal-fade {
  to { opacity: 1; }
}

/* ============================
   PAGE HERO (subpages)
   ============================ */

.page-hero {
  padding: var(--space-32) 0 var(--space-16);
  background: var(--hero-bg);
  color: var(--color-text-inverse);
  text-align: center;
}
[data-theme="dark"] .page-hero { color: var(--color-text); }
.page-hero .section-label {
  color: #86efac;
  margin-bottom: var(--space-3);
}
.page-hero-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  color: #ffffff;
  letter-spacing: -0.02em;
}
[data-theme="dark"] .page-hero-title { color: #ffffff; }
.page-hero-subtitle {
  font-size: var(--text-lg);
  color: rgba(255,255,255,0.85);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}
[data-theme="dark"] .page-hero-subtitle { color: var(--color-text-muted); }

/* Team page hero — group photo background */
.page-hero.team-hero-bg {
  position: relative;
  background: url('assets/group-photo.jpg') center center / cover no-repeat;
  min-height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-hero.team-hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(24, 69, 59, 0.65);
  z-index: 0;
}
.page-hero.team-hero-bg .container {
  position: relative;
  z-index: 1;
}
[data-theme="dark"] .page-hero.team-hero-bg::before {
  background: rgba(10, 10, 10, 0.75);
}

/* ============================
   PUBLICATION FILTERS
   ============================ */

.pub-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
  justify-content: center;
}
.pub-filter-btn {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-interactive);
}
.pub-filter-btn:hover,
.pub-filter-btn.active,
.pub-filter-btn[aria-pressed="true"] {
  background: var(--color-accent);
  color: var(--color-text-inverse);
  border-color: var(--color-accent);
}
[data-theme="dark"] .pub-filter-btn.active,
[data-theme="dark"] .pub-filter-btn[aria-pressed="true"] { color: var(--color-text-inverse); }
.pub-item[data-year] {
  overflow: hidden;
  max-height: 240px;
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity 0.3s ease,
    transform 0.3s ease,
    max-height 0.3s ease,
    padding-top 0.3s ease,
    padding-bottom 0.3s ease,
    border-color 0.3s ease;
}
.pub-item.hidden {
  max-height: 0;
  opacity: 0;
  transform: translateY(-8px);
  padding-top: 0;
  padding-bottom: 0;
  border-color: transparent;
  pointer-events: none;
}

/* ============================
   TEAM PAGE FACULTY CARD
   ============================ */

.faculty-feature {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-10);
  align-items: start;
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
}
.faculty-feature-photo {
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-2);
}
.faculty-feature-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
@media (max-width: 768px) {
  .faculty-feature {
    grid-template-columns: 1fr;
    gap: var(--space-6);
    padding: var(--space-6);
  }
  .faculty-feature-photo {
    max-width: 240px;
    margin-inline: auto;
  }
}

/* ============================
   ALUMNI / COLLAPSIBLE
   ============================ */
/* Lab Gallery */
.lab-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-4);
}
.lab-gallery-item {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
}
.lab-gallery-item img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
}
.lab-gallery-item figcaption {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

.alumni-details {
  margin-top: var(--space-6);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  padding: var(--space-4) var(--space-6);
}
.alumni-details summary {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  color: var(--color-text);
  padding: var(--space-2) 0;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.alumni-details summary::-webkit-details-marker { display: none; }
.alumni-details summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  color: var(--color-accent);
  transition: transform 0.2s ease;
}
.alumni-details[open] summary::after {
  content: "−";
}
.alumni-list {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.9;
}

/* ============================
   HOMEPAGE PREVIEW CARDS (research at a glance)
   ============================ */
.preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}
.preview-card {
  display: block;
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  text-decoration: none;
  color: var(--color-text);
  transition: all var(--transition-interactive);
  position: relative;
  overflow: hidden;
}
.preview-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  color: var(--color-text);
}
.preview-card-number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
  margin-bottom: var(--space-2);
  display: block;
}
.preview-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-3);
}
.preview-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}
.preview-card-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
}
/* Preview card with image */
.preview-card--has-img {
  padding: 0;
  display: flex;
  flex-direction: column;
}
.preview-card-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}
.preview-card-body {
  padding: var(--space-6) var(--space-8) var(--space-8);
}
@media (max-width: 768px) {
  .preview-grid { grid-template-columns: 1fr; }
  .preview-card-body {
    padding: var(--space-4) var(--space-5) var(--space-6);
  }
}

/* ============================
   PROJECT LINKS MULTI (research page)
   ============================ */
.project-card-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}
.project-card-links .project-link {
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
}
.project-card-links .project-link:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-highlight);
  text-decoration: none;
}

/* ── Research Demo Videos ── */
.demo-video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}
.demo-video-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.demo-video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.15);
}
.demo-video-card video {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display: block;
}
.demo-video-info {
  padding: 1.25rem;
}
.demo-video-info h4 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
}
.demo-video-info p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}