/* ============================================================
   RACLAB Website — Main Stylesheet (Light Theme)
   Robotics, Automation & Control Research Laboratory
   Konya Technical University
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  /* Light backgrounds */
  --bg-primary:    #ffffff;
  --bg-secondary:  #f5f5f5;
  --bg-card:       rgba(0,0,0,0.03);
  --bg-card-hover: rgba(0,0,0,0.06);

  /* RACLAB Red palette */
  --blue:          #e63329;
  --blue-dim:      rgba(230,51,41,0.10);
  --blue-glow:     rgba(230,51,41,0.30);
  --purple:        #b91c1c;
  --purple-dim:    rgba(185,28,28,0.12);
  --emerald:       #10b981;
  --emerald-dim:   rgba(16,185,129,0.12);
  --amber:         #f59e0b;

  /* Light text */
  --text-primary:   #111111;
  --text-secondary: #4b5563;
  --text-muted:     #9ca3af;

  --border:         rgba(0,0,0,0.09);
  --border-active:  rgba(230,51,41,0.45);

  --font-head: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-height: 72px;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: rgba(230,51,41,0.3); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--blue); }

/* ---------- Utility ---------- */
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.section-label {
  font-family: var(--font-head);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--blue);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: linear-gradient(to right, var(--blue), #ff6b6b);
  border-radius: 2px;
}
.section-title {
  font-family: var(--font-head);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.section-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 620px;
  line-height: 1.7;
}
.section-head { margin-bottom: 56px; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  background: var(--blue);
  color: #ffffff;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  letter-spacing: 0.3px;
}
.btn-primary:hover {
  background: #c41f16;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--blue-glow);
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 26px;
  border: 1.5px solid var(--border-active);
  color: var(--blue);
  font-family: var(--font-head);
  font-weight: 500;
  font-size: 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.btn-outline:hover {
  background: var(--blue-dim);
  transform: translateY(-2px);
}
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--blue);
  font-weight: 500;
  font-size: 14px;
  transition: var(--transition);
}
.btn-ghost:hover { gap: 10px; }
.btn-ghost svg { transition: var(--transition); }

.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  background: var(--blue-dim);
  color: var(--blue);
  border: 1px solid rgba(230,51,41,0.2);
}
.tag.purple { background: var(--purple-dim); color: #7c3aed; border-color: rgba(124,58,237,0.2); }
.tag.emerald { background: var(--emerald-dim); color: #059669; border-color: rgba(16,185,129,0.2); }
.tag.amber { background: rgba(245,158,11,0.1); color: #b45309; border-color: rgba(245,158,11,0.2); }

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============================================================
   NAVBAR
   ============================================================ */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: var(--transition);
}
#navbar.scrolled {
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.5px;
}
.nav-logo-icon {
  height: 38px;
  width: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}
.nav-logo-icon img { height: 38px; width: auto; }
.nav-logo span { color: var(--blue); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  padding: 8px 13px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--blue);
  background: var(--blue-dim);
}

.nav-cta { display: flex; align-items: center; gap: 12px; }
.nav-cta .btn-primary { padding: 9px 20px; font-size: 13px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px 24px;
  z-index: 999;
  flex-direction: column;
  gap: 4px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.mobile-menu a:hover { color: var(--blue); background: var(--blue-dim); }

/* ============================================================
   HERO — Video Background
   ============================================================ */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
#particle-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
}

/* Video background */
.hero-video-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
}
.hero-video-bg video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.hero-video-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(0,0,0,0.72) 0%,
    rgba(0,0,0,0.50) 50%,
    rgba(0,0,0,0.65) 100%
  );
}

/* Fallback static bg */
.hero-bg {
  position: absolute;
  inset: 0;
  background: url('../images/hero_banner.png') center/cover no-repeat;
  z-index: 1;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(0,0,0,0.78) 0%,
    rgba(0,0,0,0.55) 50%,
    rgba(0,0,0,0.72) 100%
  );
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(230,51,41,0.18);
  border: 1px solid rgba(230,51,41,0.35);
  border-radius: 99px;
  font-size: 12px;
  font-weight: 600;
  color: #ff8a85;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 24px;
}
.hero-badge span { width: 6px; height: 6px; border-radius: 50%; background: var(--blue); animation: pulse-dot 2s infinite; box-shadow: 0 0 8px var(--blue); }
@keyframes pulse-dot { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.5;transform:scale(1.4)} }

.hero-title {
  font-family: var(--font-head);
  font-size: clamp(40px, 7vw, 80px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -2px;
  margin-bottom: 20px;
  color: #ffffff;
}
.hero-title .accent { color: #ff8a85; }
.hero-title .grad {
  background: linear-gradient(135deg, #e63329, #ff6b6b, #ffaaaa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 18px;
  color: rgba(255,255,255,0.80);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 580px;
}
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 56px; }
.hero-buttons .btn-outline {
  border-color: rgba(255,255,255,0.4);
  color: #ffffff;
}
.hero-buttons .btn-outline:hover {
  background: rgba(255,255,255,0.12);
}

.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}
.hero-stat { display: flex; flex-direction: column; }
.hero-stat-num {
  font-family: var(--font-head);
  font-size: 32px;
  font-weight: 700;
  color: #ff8a85;
  line-height: 1;
}
.hero-stat-label {
  font-size: 12px;
  color: rgba(255,255,255,0.55);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.45);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  animation: bounce-scroll 2.5s infinite;
}
.hero-scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, rgba(230,51,41,0.7), transparent);
}
@keyframes bounce-scroll { 0%,100%{transform:translateX(-50%) translateY(0)} 50%{transform:translateX(-50%) translateY(8px)} }

/* ============================================================
   SECTIONS (shared)
   ============================================================ */
section { padding: 100px 0; }
section:nth-child(even) { background: var(--bg-secondary); }

/* ============================================================
   ABOUT
   ============================================================ */
#about .about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-image-wrap { position: relative; }
.about-image-wrap img {
  width: 100%;
  border-radius: var(--radius-lg);
  object-fit: cover;
  height: 420px;
  border: 1px solid var(--border);
  box-shadow: 0 12px 40px rgba(0,0,0,0.10);
}
.about-image-badge {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.10);
}
.about-image-badge .num { font-family: var(--font-head); font-size: 28px; font-weight: 700; color: var(--blue); }
.about-image-badge .lbl { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }

.about-text .section-subtitle { margin-bottom: 28px; }
.about-pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 32px;
}
.about-pillar {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.about-pillar:hover { border-color: var(--border-active); background: var(--blue-dim); }
.about-pillar-icon {
  width: 36px; height: 36px;
  border-radius: 8px;
  background: var(--blue-dim);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; font-size: 16px;
}
.about-pillar-text strong { font-size: 13px; font-weight: 600; display: block; margin-bottom: 2px; }
.about-pillar-text span { font-size: 12px; color: var(--text-muted); }

/* Stats bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 64px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}
.stat-cell {
  background: var(--bg-primary);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
}
.stat-cell:hover { background: var(--blue-dim); }
.stat-cell .num {
  font-family: var(--font-head);
  font-size: 40px;
  font-weight: 700;
  color: var(--blue);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-cell .lbl { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }

/* ============================================================
   RESEARCH
   ============================================================ */
.research-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.research-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  position: relative;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.research-card:hover {
  border-color: var(--border-active);
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.12);
}
.research-card-img {
  height: 200px;
  overflow: hidden;
  position: relative;
}
.research-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.research-card:hover .research-card-img img { transform: scale(1.07); }
.research-card-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 60%);
}
/* fallback gradients */
.research-card-img.grad-uav { background: linear-gradient(135deg, #1a0505 0%, #3a1010 50%, #5a1515 100%); }
.research-card-img.grad-ugv { background: linear-gradient(135deg, #0a0a1a 0%, #1a1040 50%, #250a3a 100%); }
.research-card-img.grad-auv { background: linear-gradient(135deg, #05101a 0%, #0a2840 50%, #0a3044 100%); }
.research-card-img.grad-traffic { background: linear-gradient(135deg, #100510 0%, #250840 50%, #350a3a 100%); }
.research-card-img.grad-hri { background: linear-gradient(135deg, #051005 0%, #0d2814 50%, #0f3820 100%); }
.research-card-img.grad-sensor { background: linear-gradient(135deg, #281005 0%, #3a1810 50%, #441e08 100%); }
.research-card-icon {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%,-50%); font-size: 48px; opacity: 0.8;
}
.research-card-body { padding: 22px; }
.research-card-body h3 {
  font-family: var(--font-head); font-size: 17px; font-weight: 600; margin-bottom: 8px; color: var(--text-primary);
}
.research-card-body p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 16px; }
.research-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }

/* ============================================================
   PROJECTS
   ============================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}
.project-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}
.project-card:hover {
  border-color: var(--border-active);
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.10);
}
.project-card-img {
  height: 180px; position: relative; overflow: hidden;
}
.project-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.project-card:hover .project-card-img img { transform: scale(1.08); }
.project-card-img .overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 50%);
}
.project-card-img.grad-1 { background: linear-gradient(135deg, #1a0505, #3a1515); }
.project-card-img.grad-2 { background: linear-gradient(135deg, #0a0a1a, #200a3a); }
.project-card-img.grad-3 { background: linear-gradient(135deg, #051a05, #102810); }
.project-card-img.grad-4 { background: linear-gradient(135deg, #1a0510, #280a18); }
.project-card-img.grad-5 { background: linear-gradient(135deg, #1a0a05, #280a08); }
.project-card-img.grad-6 { background: linear-gradient(135deg, #1a1605, #281808); }
.project-card-img-icon {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%); font-size: 42px; opacity: 0.85;
}
.project-card-body { padding: 20px; }
.project-card-meta { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.project-card-body h3 { font-family: var(--font-head); font-size: 16px; font-weight: 600; margin-bottom: 8px; line-height: 1.3; }
.project-card-body p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 14px; }
.projects-cta { text-align: center; }

/* ============================================================
   ACHIEVEMENTS / AWARDS
   ============================================================ */
#achievements { background: var(--bg-secondary); }
.achievements-intro {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 64px; align-items: start; margin-bottom: 64px;
}
.awards-list { display: flex; flex-direction: column; gap: 12px; }
.award-item {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.award-item:hover { border-color: var(--border-active); background: var(--blue-dim); }
.award-medal {
  width: 40px; height: 40px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; flex-shrink: 0; background: var(--blue-dim);
}
.award-medal.gold { background: rgba(245,158,11,0.12); }
.award-medal.silver { background: rgba(148,163,184,0.12); }
.award-body strong { font-size: 14px; font-weight: 600; display: block; margin-bottom: 3px; }
.award-body span { font-size: 12px; color: var(--text-muted); }

.competition-cards {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
}
.competition-card {
  padding: 24px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  text-align: center;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.competition-card:hover { border-color: var(--border-active); transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.08); }
.competition-card .icon { font-size: 32px; margin-bottom: 12px; }
.competition-card .count {
  font-family: var(--font-head); font-size: 30px; font-weight: 700;
  color: var(--blue); margin-bottom: 4px;
}
.competition-card .name { font-size: 12px; color: var(--text-muted); }

/* ============================================================
   TEAM
   ============================================================ */
.team-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 20px; margin-bottom: 40px;
}
.team-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden; transition: var(--transition); text-align: center;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}
.team-card:hover {
  border-color: var(--border-active);
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.10);
}
.team-card-avatar {
  height: 160px;
  background: linear-gradient(135deg, #f5f5f5, #e5e5e5);
  display: flex; align-items: center; justify-content: center;
  font-size: 52px; position: relative; overflow: hidden;
}
.team-card-avatar::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.25) 0%, transparent 50%);
}
.team-card-body { padding: 18px 14px 20px; }
.team-card-body h3 { font-family: var(--font-head); font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.team-card-body .role { font-size: 12px; color: var(--blue); margin-bottom: 6px; }
.team-card-body .dept { font-size: 11px; color: var(--text-muted); }
.team-card-links { display: flex; justify-content: center; gap: 10px; margin-top: 12px; }
.team-card-links a {
  width: 30px; height: 30px; border-radius: 8px;
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; color: var(--text-muted); transition: var(--transition);
}
.team-card-links a:hover { border-color: var(--blue); color: var(--blue); background: var(--blue-dim); }

/* ============================================================
   NEWS
   ============================================================ */
.news-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 24px; margin-bottom: 40px;
}
.news-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden; transition: var(--transition);
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}
.news-card:hover { border-color: var(--border-active); transform: translateY(-4px); box-shadow: 0 12px 36px rgba(0,0,0,0.10); }
.news-card-img { height: 220px; overflow: hidden; position: relative; }
.news-card.featured .news-card-img { height: 280px; }
.news-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.news-card:hover .news-card-img img { transform: scale(1.06); }
.news-card-img .overlay { position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,0.75) 0%, transparent 60%); }
.news-card-img.grad-n1 { background: linear-gradient(135deg, #1a0505, #3a1010); }
.news-card-img.grad-n2 { background: linear-gradient(135deg, #0a0a1a, #1a0d3a); }
.news-card-img.grad-n3 { background: linear-gradient(135deg, #051a0a, #0a2818); }
.news-card-img-icon { position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); font-size: 40px; opacity: 0.7; }
.news-card-body { padding: 20px; }
.news-card-meta { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.news-card-date { font-size: 11px; color: var(--text-muted); }
.news-card-body h3 { font-family: var(--font-head); font-size: 16px; font-weight: 600; line-height: 1.4; margin-bottom: 8px; }
.news-card.featured .news-card-body h3 { font-size: 20px; }
.news-card-body p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 14px; }

/* ============================================================
   PUBLICATIONS
   ============================================================ */
.publications-list { display: flex; flex-direction: column; gap: 16px; margin-bottom: 40px; }
.pub-card {
  display: flex; gap: 20px; align-items: flex-start;
  padding: 24px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.pub-card:hover { border-color: var(--border-active); background: var(--blue-dim); }
.pub-num {
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--blue-dim);
  border: 1px solid rgba(230,51,41,0.2);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-head); font-weight: 700; font-size: 14px;
  color: var(--blue); flex-shrink: 0;
}
.pub-content { flex: 1; }
.pub-content h3 { font-size: 15px; font-weight: 600; line-height: 1.4; margin-bottom: 6px; }
.pub-content .authors { font-size: 13px; color: var(--text-secondary); margin-bottom: 6px; }
.pub-content .journal { font-size: 12px; color: var(--blue); font-style: italic; margin-bottom: 8px; }
.pub-meta { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.pub-badge {
  padding: 2px 8px; border-radius: 99px;
  font-size: 10px; font-weight: 700; letter-spacing: 0.5px; text-transform: uppercase;
  background: rgba(16,185,129,0.10); color: #059669;
  border: 1px solid rgba(16,185,129,0.2);
}
.pub-year { font-size: 12px; color: var(--text-muted); }

/* ============================================================
   SPONSORS — Scrolling Logo Strip
   ============================================================ */
#sponsors { background: var(--bg-secondary); overflow: hidden; }

/* Infinite scroll track */
.sponsors-track-wrap {
  position: relative;
  overflow: hidden;
  margin-bottom: 48px;
  padding: 8px 0;
}
.sponsors-track-wrap::before,
.sponsors-track-wrap::after {
  content: '';
  position: absolute;
  top: 0; bottom: 0;
  width: 120px;
  z-index: 2;
  pointer-events: none;
}
.sponsors-track-wrap::before {
  left: 0;
  background: linear-gradient(to right, var(--bg-secondary), transparent);
}
.sponsors-track-wrap::after {
  right: 0;
  background: linear-gradient(to left, var(--bg-secondary), transparent);
}
.sponsors-track {
  display: flex;
  align-items: center;
  gap: 48px;
  width: max-content;
  animation: scroll-logos 28s linear infinite;
}
.sponsors-track:hover { animation-play-state: paused; }
@keyframes scroll-logos {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
.sp-logo-item {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 140px;
  height: 72px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.sp-logo-item:hover {
  border-color: var(--border-active);
  box-shadow: 0 4px 16px rgba(230,51,41,0.12);
  transform: scale(1.05);
}
.sp-logo-item img {
  max-width: 100%; max-height: 48px;
  object-fit: contain; filter: grayscale(0.2);
  transition: var(--transition);
}
.sp-logo-item:hover img { filter: grayscale(0); }

/* Text-only logo fallback */
.sp-logo-text {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.3;
}

/* Sponsor detail cards */
.sponsors-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}
.sponsor-card {
  padding: 28px 24px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
  display: flex; flex-direction: column; gap: 14px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.sponsor-card:hover { border-color: var(--border-active); transform: translateY(-4px); box-shadow: 0 12px 36px rgba(230,51,41,0.08); }
.sponsor-logo-area {
  width: 56px; height: 56px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 800; font-family: var(--font-head); color: white;
}
.sponsor-logo-area.blue   { background: linear-gradient(135deg, #1d4ed8, #3b82f6); }
.sponsor-logo-area.green  { background: linear-gradient(135deg, #047857, #10b981); }
.sponsor-logo-area.purple { background: linear-gradient(135deg, #5b21b6, #7c3aed); }
.sponsor-logo-area.red    { background: linear-gradient(135deg, #991b1b, #e63329); }
.sponsor-logo-area.orange { background: linear-gradient(135deg, #92400e, #f59e0b); }
.sponsor-logo-area.teal   { background: linear-gradient(135deg, #0f766e, #14b8a6); }
.sponsor-card h3 { font-family: var(--font-head); font-size: 16px; font-weight: 600; }
.sponsor-card p  { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }
.sponsor-card .project-count { font-size: 12px; color: var(--blue); font-weight: 500; }

/* ============================================================
   CONTACT
   ============================================================ */
.contact-wrap {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 64px; align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 28px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: var(--blue-dim);
  border: 1px solid rgba(230,51,41,0.2);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; flex-shrink: 0;
}
.contact-item h4 { font-size: 13px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 4px; }
.contact-item p, .contact-item a { font-size: 15px; color: var(--text-primary); }
.contact-item a:hover { color: var(--blue); }

.contact-social { display: flex; gap: 12px; margin-top: 8px; }
.social-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 500; color: var(--text-secondary);
  transition: var(--transition);
}
.social-btn:hover { border-color: var(--blue); color: var(--blue); background: var(--blue-dim); }

.contact-form-wrap {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}
.contact-form-wrap h3 { font-family: var(--font-head); font-size: 22px; font-weight: 600; margin-bottom: 24px; }
.form-group { margin-bottom: 16px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-group label {
  display: block; font-size: 12px; font-weight: 600;
  color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px;
}
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 14px;
  background: var(--bg-secondary);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body); font-size: 14px;
  transition: var(--transition); outline: none; resize: none;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--blue);
  background: var(--bg-primary);
  box-shadow: 0 0 0 3px rgba(230,51,41,0.08);
}
.form-group select option { background: var(--bg-primary); }
.form-group textarea { height: 120px; }
.contact-form-wrap .btn-primary { width: 100%; justify-content: center; padding: 14px; font-size: 15px; }

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  background: #111111;
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 56px 0 32px;
}
footer * { color: inherit; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-brand p { font-size: 13px; color: #9ca3af; line-height: 1.7; max-width: 280px; margin-top: 12px; }
.footer-col h4 {
  font-family: var(--font-head); font-size: 13px; font-weight: 600;
  color: #f5f5f5; margin-bottom: 16px;
  text-transform: uppercase; letter-spacing: 0.5px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul a { font-size: 13px; color: #9ca3af; transition: var(--transition); }
.footer-col ul a:hover { color: var(--blue); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.footer-bottom p { font-size: 12px; color: #6b7280; }
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a { font-size: 12px; color: #6b7280; transition: var(--transition); }
.footer-bottom-links a:hover { color: var(--blue); }

/* Footer logo */
.footer-logo-img {
  height: 40px; width: auto;
  /* logo has white text: needs to show on dark footer */
  filter: brightness(1.1);
}

/* ============================================================
   GLOW DIVIDER
   ============================================================ */
.glow-divider {
  width: 100%; height: 2px;
  background: linear-gradient(to right, transparent, var(--blue), #ff6b6b, transparent);
  opacity: 0.5;
}

/* ============================================================
   BACK TO TOP
   ============================================================ */
#back-to-top {
  position: fixed; bottom: 28px; right: 28px;
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--blue); color: #ffffff;
  font-size: 20px;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: translateY(12px);
  transition: var(--transition); z-index: 500;
  cursor: pointer; border: none;
  box-shadow: 0 4px 20px var(--blue-glow);
}
#back-to-top.visible { opacity: 1; transform: translateY(0); }
#back-to-top:hover { background: #c41f16; transform: translateY(-2px); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1100px) {
  .research-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .competition-cards { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 860px) {
  #about .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-pillars { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .achievements-intro { grid-template-columns: 1fr; gap: 32px; }
  .news-grid { grid-template-columns: 1fr; }
  .contact-wrap { grid-template-columns: 1fr; gap: 40px; }
  .sponsors-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
}
@media (max-width: 600px) {
  section { padding: 64px 0; }
  .research-grid, .projects-grid, .team-grid, .competition-cards, .sponsors-grid { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 20px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
}