/* ============================================================
   AIoT Research Lab — Design System
   Hacettepe University
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=IBM+Plex+Serif:ital,wght@0,400;0,600;1,400&display=swap');

/* ---- 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);

  /* 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;

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

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

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

  /* Fonts */
  --font-body: 'Inter', system-ui, sans-serif;
  --font-display: 'IBM Plex Serif', Georgia, serif;
}

/* ---- Light Mode (Default) ---- */
:root, [data-theme='light'] {
  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-surface-2: #f0f3f8;
  --color-surface-offset: #e8ecf2;
  --color-border: #d0d6e0;
  --color-divider: #e0e4ec;

  --color-text: #1a2035;
  --color-text-muted: #5a6580;
  --color-text-faint: #a0aabf;
  --color-text-inverse: #ffffff;

  /* Hacettepe deep navy + teal accent */
  --color-primary: #1a3a6b;
  --color-primary-hover: #0f2550;
  --color-primary-active: #081a38;
  --color-primary-highlight: #c8d6f0;

  --color-accent: #0077b6;
  --color-accent-hover: #005f8e;
  --color-accent-light: #e0f0fb;

  --color-success: #2d7a4f;
  --color-warning: #a35c00;
  --color-error: #b5283f;

  --shadow-sm: 0 1px 3px rgba(26,32,53,0.06);
  --shadow-md: 0 4px 12px rgba(26,32,53,0.09);
  --shadow-lg: 0 12px 32px rgba(26,32,53,0.13);
}

/* ---- Dark Mode ---- */
[data-theme='dark'] {
  --color-bg: #111520;
  --color-surface: #171c2e;
  --color-surface-2: #1e2438;
  --color-surface-offset: #1b2032;
  --color-border: #2e3650;
  --color-divider: #252d45;

  --color-text: #d4dae8;
  --color-text-muted: #7a85a0;
  --color-text-faint: #4a5270;
  --color-text-inverse: #111520;

  --color-primary: #5b82d4;
  --color-primary-hover: #7a9fec;
  --color-primary-active: #9ab8f5;
  --color-primary-highlight: #1e2c50;

  --color-accent: #4fafd6;
  --color-accent-hover: #6ec3e8;
  --color-accent-light: #152333;

  --color-success: #4da876;
  --color-warning: #d4852a;
  --color-error: #e05070;

  --shadow-sm: 0 1px 3px 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);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #111520;
    --color-surface: #171c2e;
    --color-surface-2: #1e2438;
    --color-surface-offset: #1b2032;
    --color-border: #2e3650;
    --color-divider: #252d45;
    --color-text: #d4dae8;
    --color-text-muted: #7a85a0;
    --color-text-faint: #4a5270;
    --color-text-inverse: #111520;
    --color-primary: #5b82d4;
    --color-primary-hover: #7a9fec;
    --color-primary-active: #9ab8f5;
    --color-primary-highlight: #1e2c50;
    --color-accent: #4fafd6;
    --color-accent-hover: #6ec3e8;
    --color-accent-light: #152333;
    --shadow-sm: 0 1px 3px 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);
  }
}

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

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

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

img, picture, svg { display: block; max-width: 100%; height: auto; }
ul[role='list'], ol[role='list'] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.2; font-family: var(--font-display); }
p, li { text-wrap: pretty; max-width: 72ch; }
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent-hover); text-decoration: underline; }

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

::selection { background: var(--color-primary-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; transition-duration: 0.01ms !important; }
}

/* ============================================================
   LAYOUT UTILITIES
   ============================================================ */
.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-12));
}
.container--narrow { max-width: var(--content-default); }
.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; }

/* ============================================================
   HEADER & NAVIGATION
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
}

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.logo-wordmark {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.logo-wordmark .university {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 400;
  color: rgba(255,255,255,0.7);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.logo-wordmark .lab-name {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  font-weight: 600;
  color: #ffffff;
  letter-spacing: -0.01em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Desktop Nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.main-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: rgba(255,255,255,0.82);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition);
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
  color: #ffffff;
  background: rgba(255,255,255,0.15);
  text-decoration: none;
}

.main-nav a.active {
  background: rgba(255,255,255,0.2);
}

/* Theme toggle */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.8);
  background: rgba(255,255,255,0.1);
  transition: all var(--transition);
  flex-shrink: 0;
}
.theme-toggle:hover { background: rgba(255,255,255,0.2); color: #fff; }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  width: 36px; height: 36px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: var(--space-2);
  color: white;
  border-radius: var(--radius-md);
  transition: background var(--transition);
}
.nav-toggle:hover { background: rgba(255,255,255,0.15); }
.nav-toggle span {
  display: block;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

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

  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--color-primary);
    padding: var(--space-4);
    gap: var(--space-1);
    box-shadow: var(--shadow-lg);
    z-index: 99;
  }
  .main-nav.open a { padding: var(--space-3) var(--space-4); border-radius: var(--radius-md); }
}

/* ============================================================
   HERO / BANNER
   ============================================================ */
.page-hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, #0f2a52 50%, #0a1e3d 100%);
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  position: relative;
  overflow: hidden;
}

.page-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") repeat;
}

.page-hero .container { position: relative; }

.hero-content { max-width: 680px; }

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
  margin-bottom: var(--space-4);
}

.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: #ffffff;
  line-height: 1.1;
  margin-bottom: var(--space-5);
}

.hero-subtitle {
  font-size: var(--text-base);
  color: rgba(255,255,255,0.72);
  line-height: 1.7;
  max-width: 60ch;
}

.hero-stats {
  display: flex;
  gap: var(--space-8);
  margin-top: var(--space-8);
  flex-wrap: wrap;
}

.hero-stat .value {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: #ffffff;
  line-height: 1;
}

.hero-stat .label {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.55);
  margin-top: var(--space-1);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ============================================================
   MAIN LAYOUT WITH SIDEBAR
   ============================================================ */
.page-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--space-8);
  padding-block: clamp(var(--space-8), 5vw, var(--space-16));
  align-items: start;
}

@media (max-width: 900px) {
  .page-layout { grid-template-columns: 1fr; }
}

/* Sidebar */
.sidebar {
  position: sticky;
  top: calc(64px + var(--space-4));
}

.sidebar-nav {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  list-style: none;
}

.sidebar-nav li + li { border-top: 1px solid var(--color-divider); }

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

.sidebar-nav a:hover,
.sidebar-nav a.active {
  color: var(--color-accent);
  background: var(--color-accent-light);
  text-decoration: none;
}

/* ============================================================
   SECTION HEADINGS
   ============================================================ */
.section-heading {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.section-heading h2 {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
}

.section-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-divider);
}

/* ============================================================
   HOME PAGE — ABOUT
   ============================================================ */
.about-section { padding-block: clamp(var(--space-12), 8vw, var(--space-20)); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

@media (max-width: 760px) {
  .about-grid { grid-template-columns: 1fr; gap: var(--space-8); }
}

.about-text h2 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.about-text p {
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-4);
}

.about-image {
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--color-surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

/* Research areas grid */
.research-areas {
  padding-block: clamp(var(--space-10), 6vw, var(--space-16));
  background: var(--color-surface-2);
}

.areas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.area-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.area-icon {
  width: 40px; height: 40px;
  background: var(--color-accent-light);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.area-card h3 {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.area-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Quick stats bar */
.stats-bar {
  background: var(--color-primary);
  padding-block: clamp(var(--space-8), 4vw, var(--space-12));
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  text-align: center;
}

@media (max-width: 600px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }

.stat-item .stat-number {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: #ffffff;
  line-height: 1;
}

.stat-item .stat-label {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.6);
  margin-top: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ============================================================
   PEOPLE PAGE
   ============================================================ */
.people-section { margin-bottom: var(--space-12); scroll-margin-top: 100px; }

.director-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: grid;
  grid-template-columns: 280px 1fr;
}

@media (max-width: 700px) {
  .director-card { grid-template-columns: 1fr; }
}

.director-photo {
  aspect-ratio: 3/4;
  overflow: hidden;
  background: var(--color-surface-2);
}

.director-photo img { width: 100%; height: 100%; object-fit: cover; }

.director-info {
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.director-name {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.director-title {
  font-size: var(--text-base);
  color: var(--color-accent);
  margin-bottom: var(--space-5);
}

.director-bio { color: var(--color-text-muted); margin-bottom: var(--space-5); line-height: 1.7; }

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 500;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  background: var(--color-surface-2);
  text-decoration: none;
  transition: all var(--transition);
}

.contact-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
  text-decoration: none;
}

/* People grid (collaborators + researchers) */
.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-5);
}

.person-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.person-photo {
  aspect-ratio: 1;
  overflow: hidden;
  background: var(--color-surface-2);
}

.person-photo img { width: 100%; height: 100%; object-fit: cover; object-position: top center; }
#students .people-grid { grid-template-columns: repeat(4, 1fr); }

.person-info { padding: var(--space-4); }

.person-name {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

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

.person-affiliation {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
  line-height: 1.4;
}

.person-links { display: flex; gap: 4px; flex-wrap: wrap; }

.person-link {
  font-size: 11px;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: all var(--transition);
}
.person-link:hover { border-color: var(--color-accent); color: var(--color-accent); text-decoration: none; }

/* ============================================================
   PUBLICATIONS PAGE
   ============================================================ */
.pub-controls {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
  align-items: center;
}

.pub-search {
  flex: 1;
  min-width: 200px;
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-sm);
  transition: border-color var(--transition);
}

.pub-search:focus { border-color: var(--color-accent); outline: none; }

.pub-filter {
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: border-color var(--transition);
}

.pub-filter:focus { border-color: var(--color-accent); outline: none; }

.metrics-bar {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
}

.metric-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-3) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  min-width: 100px;
}

.metric-chip .value {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1;
}

.metric-chip .label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
  text-align: center;
}

.pub-year-group { margin-bottom: var(--space-10); scroll-margin-top: 100px; }

.pub-year-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.pub-year-badge {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
}

.pub-year-header .line {
  flex: 1;
  height: 1px;
  background: var(--color-divider);
}

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

.pub-list { display: flex; flex-direction: column; gap: var(--space-3); }

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

.pub-item:hover { box-shadow: var(--shadow-sm); }

.pub-number {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 600;
  min-width: 28px;
  padding-top: 3px;
  text-align: right;
  flex-shrink: 0;
}

.pub-body { flex: 1; }

.pub-title {
  font-family: var(--font-body);
  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-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
  font-style: italic;
}

.pub-venue {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.pub-venue-name { color: var(--color-accent); font-weight: 500; }

.pub-citations {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-success);
  background: color-mix(in srgb, var(--color-success) 10%, transparent);
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
}

/* Hidden class for filtering */
.pub-item.hidden { display: none; }

/* ============================================================
   RESEARCH / PROJECTS PAGE
   ============================================================ */
.projects-section { margin-bottom: var(--space-12); scroll-margin-top: 100px; }

.sponsor-logos {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-8);
}

.sponsor-logos img {
  height: 40px;
  width: auto;
  object-fit: contain;
  filter: grayscale(0.2);
  opacity: 0.85;
  transition: opacity var(--transition);
}

.sponsor-logos img:hover { opacity: 1; filter: none; }

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

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  transition: box-shadow var(--transition);
}

.project-card:hover { box-shadow: var(--shadow-sm); }

.project-header {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  flex-wrap: wrap;
  align-items: flex-start;
}

.project-title {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  flex: 1;
  line-height: 1.4;
}

.project-tag {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  white-space: nowrap;
  flex-shrink: 0;
}

.tag-tubitak { background: #e8f0ff; color: #1a3a8f; }
.tag-aselsan { background: #fff3e0; color: #8f4500; }
.tag-ministry { background: #e8f5e9; color: #1a6b2d; }
.tag-industry { background: #f3e8ff; color: #5c1a8f; }

[data-theme='dark'] .tag-tubitak { background: #1a2a50; color: #7aa0ff; }
[data-theme='dark'] .tag-aselsan { background: #3d2200; color: #ffa040; }
[data-theme='dark'] .tag-ministry { background: #1a3320; color: #50c87a; }
[data-theme='dark'] .tag-industry { background: #2d1a45; color: #c080ff; }

.project-meta {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.project-meta span { display: flex; align-items: center; gap: var(--space-1); }

.project-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ============================================================
   TEACHING PAGE
   ============================================================ */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
}

.course-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.course-code {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 3px var(--space-2);
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: var(--space-3);
}

.course-name {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}

/* ============================================================
   CONTACT PAGE
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
}

@media (max-width: 700px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-info-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
}

.contact-info-card h2 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-6);
  color: var(--color-text);
}

.contact-detail {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-divider);
}

.contact-detail:last-of-type { border-bottom: none; }

.contact-icon {
  width: 40px; height: 40px;
  background: var(--color-accent-light);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-accent);
  flex-shrink: 0;
}

.contact-detail h3 {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.contact-detail p, .contact-detail a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

.map-container {
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
  height: 100%;
  min-height: 400px;
}

.map-container iframe {
  width: 100%;
  height: 100%;
  min-height: 400px;
  display: block;
  border: none;
  filter: none;
}

[data-theme='dark'] .map-container iframe {
  filter: invert(90%) hue-rotate(180deg) brightness(0.85);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.75);
  padding-block: clamp(var(--space-10), 5vw, var(--space-16));
  margin-top: var(--space-24);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-8);
}

@media (max-width: 700px) {
  .footer-grid { grid-template-columns: 1fr; }
}

.footer-brand .lab-name-footer {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: #fff;
  margin-bottom: var(--space-3);
}

.footer-brand p {
  font-size: var(--text-sm);
  line-height: 1.7;
  max-width: 38ch;
}

.footer-col h4 {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: var(--space-4);
}

.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }

.footer-col a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.65);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-col a:hover { color: #fff; text-decoration: none; }

.footer-bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.4);
}

/* ============================================================
   BADGES / CHIPS
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
}
.badge-blue { background: var(--color-primary-highlight); color: var(--color-primary); }

/* ============================================================
   PAGE CONTENT WRAPPER
   ============================================================ */
.page-content { padding-block: clamp(var(--space-8), 5vw, var(--space-16)); }

.content-section {
  margin-bottom: var(--space-16);
  scroll-margin-top: 100px;
}

/* No sidebar variant */
.page-content-full { padding-block: clamp(var(--space-8), 5vw, var(--space-16)); }