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

* {
  box-sizing: border-box;
}

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

.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; /* smaller height for mobile */
}

.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;
}

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

/* Hero */
.hero {
  position: relative;
  height: 90vh;
  background: url("images/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 1s ease-in-out;
}

/* Highlighted SPARK Title */
.hero-content::before {
  content: "SPARK 1.0";
  position: absolute;
  top: -60px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 80px;
  font-weight: 800;
  color: rgba(250, 204, 21, 0.12);
  letter-spacing: 4px;
  white-space: nowrap;
  z-index: -1;
}

.hero-content h1 {
  margin: 0 0 16px;
  font-size: 44px;
  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;
  line-height: 1.6;
  color: #f3f4f6;
}

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

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

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
}

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

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

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

.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);
}

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

/* Teaser */
.teaser {
  margin: 30px auto;
  max-width: 900px;
  text-align: center;
  color: var(--muted);
}

/* 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);
}

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

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

.card-actions {
  margin-top: 12px;
  display: flex;
  gap: 8px;
}

/* Sections */
.container section {
  margin-top: 26px;
}

/* About */
.about-hero {
  display: flex;
  gap: 26px;
  align-items: flex-start;
}

.about-hero .left {
  flex: 2;
}

.about-hero .right {
  flex: 1;
}

.ecell {
  max-width: 160px;
  display: block;
  margin-left: auto;
  border-radius: 8px;
}

/* Contacts */
.contacts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 12px;
}

.contact-card {
  background: var(--card);
  padding: 14px;
  border-radius: 10px;
  border: 1px solid #e5e7eb;
}

/* Footer */
.site-footer {
  background: var(--primary);
  color: #fff;
  padding: 16px 0;
  text-align: center;
  font-size: 14px;
  margin-top: 40px;
  border-top: 2px solid var(--accent);
}

.site-footer p {
  margin: 0;
}

/* Logos */
.college-logo img,
.ecell-logo img {
  max-height: 52px;
  vertical-align: middle;
}

.logos {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Responsive */
@media (max-width: 800px) {
  .hero {
    height: auto;
    padding: 60px 20px;
  }
  .hero-content::before {
    font-size: 46px;
    top: -40px;
  }
  .hero-content h1 {
    font-size: 28px;
  }
  .hero-content p {
    font-size: 16px;
  }
  .highlights {
    flex-direction: column;
  }
  .about-hero {
    flex-direction: column;
  }
}

/* Compact Navbar on Mobile */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: center;
  }
  .nav {
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 4px;
  }
  .nav a {
    margin: 2px 4px;
    padding: 5px 8px;
    font-size: 14px;
  }
  .site-header {
    padding: 6px 0;
  }
}