/* ===========================
   INFINITE TECHFEST’25 THEME
   Science & Humanities Dept.
   =========================== */

:root {
  --bg: #ffffff;
  --card: #f9fafb;
  --muted: #6b7280;
  --accent: #facc15; /* gold */
  --primary: #1e3a8a; /* professional navy blue */
  --glass: rgba(0, 0, 0, 0.02);
  --container: 1100px;
  --transition: all 0.3s ease-in-out;
}

/* General Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: linear-gradient(180deg, #ffffff 0%, #f3f4f6 100%);
  color: #111827;
  font-family: "Inter", "Segoe UI", Arial, Helvetica, sans-serif;
  line-height: 1.6;
}

/* Layout Container */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 20px;
}

/* ---------------- HEADER ---------------- */
.site-header {
  position: sticky;
  top: 0;
  background: var(--primary);
  color: #fff;
  border-bottom: 2px solid var(--accent);
  z-index: 10;
  padding: 10px 0;
  min-height: 54px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 16px;
  flex-wrap: wrap;
}

.brand {
  font-size: 1.4rem;
  font-weight: bold;
  color: #fff;
  text-decoration: none;
}

.brand span {
  color: var(--accent);
  margin-left: 6px;
  font-weight: 600;
}

.nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.nav a {
  color: #fff;
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 15px;
  transition: var(--transition);
}

.nav a.active,
.nav a:hover {
  background: var(--accent);
  color: #111827;
  font-weight: 600;
}

/* ---------------- HERO ---------------- */
.hero {
  position: relative;
  height: 85vh;
  background: url("../assets/infinite_banner.png") center/cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  overflow: hidden;
  border-radius: 0 0 12px 12px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.65), rgba(0, 0, 0, 0.4));
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 850px;
  padding: 20px;
  animation: fadeUp 1.2s ease-in-out;
}

.hero-content h1 {
  margin: 0 0 16px;
  font-size: 48px;
  font-weight: 700;
  color: var(--accent);
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.6);
}

.hero-content p {
  margin: 0 0 28px;
  font-size: 18px;
  color: #f3f4f6;
}

.hero-ctas {
  display: flex;
  justify-content: center;
  gap: 16px;
}

/* ---------------- BUTTONS ---------------- */
.btn {
  display: inline-block;
  padding: 12px 20px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn.primary {
  background: var(--primary);
  color: var(--accent);
  box-shadow: 0 10px 30px rgba(17, 24, 39, 0.2);
}

.btn.primary:hover {
  background: var(--accent);
  color: #111827;
}

.btn.ghost {
  border: 1px solid #d1d5db;
  color: var(--accent);
  background: transparent;
}

.btn.ghost:hover {
  background: var(--accent);
  color: #111827;
}

/* ---------------- HIGHLIGHTS ---------------- */
.highlights {
  display: flex;
  gap: 18px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.card {
  flex: 1;
  background: var(--card);
  padding: 18px;
  border-radius: 12px;
  border: 1px solid #e5e7eb;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.05);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.card h3 {
  margin: 0 0 8px;
  color: var(--accent);
}

/* ---------------- EVENTS GRID ---------------- */
.events-grid .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.event-card {
  background: var(--card);
  padding: 18px;
  border-radius: 12px;
  border: 1px solid #e5e7eb;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  transition: var(--transition);
}

.event-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
}

.event-card h3 {
  margin: 0 0 6px;
  color: var(--accent);
}

.event-card .date {
  color: var(--muted);
  margin-bottom: 10px;
}

/* ---------------- CONTACT ---------------- */
.contacts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.contact-card {
  background: var(--card);
  padding: 14px;
  border-radius: 10px;
  border: 1px solid #e5e7eb;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.04);
}

/* ---------------- FOOTER ---------------- */
.site-footer {
  background: var(--primary);
  color: #fff;
  padding: 18px 0;
  text-align: center;
  font-size: 14px;
  margin-top: 40px;
  border-top: 2px solid var(--accent);
}

.site-footer p {
  margin: 0;
}

/* ---------------- ANIMATIONS ---------------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------------- RESPONSIVE ---------------- */
@media (max-width: 800px) {
  .hero {
    height: auto;
    padding: 80px 20px;
  }

  .hero-content h1 {
    font-size: 32px;
  }

  .hero-content p {
    font-size: 16px;
  }

  .highlights {
    flex-direction: column;
  }

  .header-inner {
    flex-direction: column;
  }

  .nav {
    justify-content: center;
    flex-wrap: wrap;
  }

  .nav a {
    font-size: 14px;
  }
}