/* === ROOT THEME === */
:root {
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --accent: #10b981;
  --light-bg: #f8fafc;
  --dark-text: #1e293b;
  --muted-text: #64748b;
  --white: #fff;
  --shadow: 0 8px 32px rgba(0,0,0,0.08);
  --radius: 14px;
  --transition: 0.2s cubic-bezier(.4,0,.2,1);
}

/* === BASE RESET === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: 'Poppins', sans-serif;
  background: var(--light-bg);
  color: var(--dark-text);
  min-height: 100vh;
  line-height: 1.6;
}

/* === NAVBAR === */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.04);
  padding: 1rem 0;
}
.nav-container {
  max-width: 1200px;
  margin: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2rem;
}
.brand a {
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: 1px;
}
.nav-links a {
  margin-left: 2rem;
  color: var(--dark-text);
  font-weight: 500;
  text-decoration: none;
  position: relative;
  transition: color var(--transition);
}
.nav-links a.active,
.nav-links a:hover {
  color: var(--primary-dark);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transition: var(--transition);
}
.nav-links a.active::after,
.nav-links a:hover::after {
  transform: scaleX(1);
}

/* === HERO SECTION === */
.hero {
  background: linear-gradient(90deg, #ede9fe 0%, #f0fdfa 100%);
  padding: 3.5rem 1rem 2.5rem 1rem;
  text-align: center;
}
.hero-content h1 {
  font-size: 2.7rem;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 0.7rem;
}
.hero-content p {
  color: var(--muted-text);
  font-size: 1.15rem;
  margin-bottom: 1.5rem;
}
.hero-cta {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  padding: 0.85rem 2.2rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1.1rem;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: background var(--transition), transform var(--transition);
}
.hero-cta:hover {
  background: var(--primary-dark);
  transform: translateY(-2px) scale(1.03);
}

/* === FILTER BAR === */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  max-width: 1200px;
  margin: 2.2rem auto 1.2rem auto;
  padding: 0 1rem;
}
.pill-filters {
  display: flex;
  gap: 0.7rem;
}
.pill {
  padding: 0.55rem 1.5rem;
  border-radius: 999px;
  border: none;
  background: #ede9fe;
  color: var(--primary-dark);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  outline: none;
}
.pill.active, .pill:focus {
  background: var(--primary);
  color: var(--white);
}
.pill:hover:not(.active) {
  background: #c7d2fe;
}

.search-sort-bar {
  display: flex;
  gap: 1.1rem;
  align-items: center;
}
.search-box {
  position: relative;
}
#searchInput {
  padding: 0.7rem 2.2rem 0.7rem 1.1rem;
  border: 1px solid #d1d5db;
  border-radius: var(--radius);
  font-size: 1rem;
  background: var(--white);
  width: 200px;
  transition: border var(--transition), box-shadow var(--transition);
}
#searchInput:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px #a5b4fc44;
}
.search-icon {
  position: absolute;
  right: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted-text);
  font-size: 1.1rem;
  pointer-events: none;
}
.sort-dropdown {
  position: relative;
}
#sortSelect {
  padding: 0.7rem 2.2rem 0.7rem 1.1rem;
  border: 1px solid #d1d5db;
  border-radius: var(--radius);
  font-size: 1rem;
  background: var(--white);
  appearance: none;
  width: 140px;
  color: var(--primary-dark);
  font-weight: 500;
  transition: border var(--transition), box-shadow var(--transition);
}
#sortSelect:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px #a5b4fc44;
}
.dropdown-icon {
  position: absolute;
  right: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted-text);
  font-size: 1.1rem;
  pointer-events: none;
}

/* === HACKATHON GRID === */
.hackathon-grid {
  display: grid;
  gap: 2.2rem;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  max-width: 1200px;
  margin: auto;
  padding: 2rem 1rem 3rem 1rem;
}

/* === HACKATHON CARD === */
.hackathon-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem 1.5rem 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  min-height: 260px;
  transition: box-shadow var(--transition), transform var(--transition);
  border: 1.5px solid #ede9fe;
}
.hackathon-card:hover {
  box-shadow: 0 16px 40px rgba(79,70,229,0.10);
  transform: translateY(-5px) scale(1.02);
  border-color: var(--primary);
}
.hackathon-card .card-header {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.7rem;
}
.hackathon-card .card-logo {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: #ede9fe;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--primary-dark);
  font-weight: 700;
}
.hackathon-card .card-title {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 0.1rem;
}
.hackathon-card .card-meta {
  font-size: 0.98rem;
  color: var(--muted-text);
  margin-bottom: 0.5rem;
}
.hackathon-card .card-desc {
  color: var(--dark-text);
  font-size: 1.01rem;
  margin-bottom: 1.1rem;
  flex-grow: 1;
}
.hackathon-card .card-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.7rem;
}
.card-btn {
  padding: 0.6rem 1.3rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  background: var(--primary);
  color: var(--white);
  transition: background var(--transition), transform var(--transition);
  text-decoration: none;
  display: inline-block;
}
.card-btn:hover {
  background: var(--primary-dark);
  transform: scale(1.04);
}

/* === MODAL === */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0; top: 0; right: 0; bottom: 0;
  background: rgba(30,41,59,0.25);
  justify-content: center;
  align-items: center;
  transition: opacity var(--transition);
}
.modal[style*="display: block"] {
  display: flex;
}
.modal-content {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
  padding: 2.2rem 2rem 1.5rem 2rem;
  max-width: 420px;
  width: 95vw;
  position: relative;
  animation: modalIn 0.25s cubic-bezier(.4,0,.2,1);
}
@keyframes modalIn {
  from { transform: translateY(40px) scale(0.97); opacity: 0; }
  to { transform: none; opacity: 1; }
}
.close-btn {
  position: absolute;
  top: 1.1rem;
  right: 1.1rem;
  background: none;
  border: none;
  font-size: 1.7rem;
  color: var(--muted-text);
  cursor: pointer;
  transition: color var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.close-btn:hover {
  color: var(--primary-dark);
}
.modal-header h2 {
  font-size: 1.35rem;
  color: var(--primary);
  margin-bottom: 0.2rem;
}
#modalMeta {
  color: var(--muted-text);
  font-size: 1rem;
  margin-bottom: 1rem;
}
#modalDescription {
  color: var(--dark-text);
  font-size: 1.05rem;
  margin-bottom: 1rem;
}
#modalInfoList {
  margin-bottom: 1.2rem;
  padding-left: 1.1rem;
}
#modalInfoList li {
  color: var(--muted-text);
  font-size: 0.98rem;
  margin-bottom: 0.4rem;
}
.modal-footer {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
}
.apply-btn {
  background: var(--accent);
  color: var(--white);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius);
  border: none;
  transition: background var(--transition), transform var(--transition);
  display: inline-block;
}
.apply-btn:hover {
  background: #059669;
  transform: scale(1.04);
}

/* === FOOTER === */
.footer {
  background: #ede9fe;
  color: var(--dark-text);
  padding: 2.5rem 1rem 1.2rem 1rem;
  text-align: center;
  margin-top: 3rem;
}
.footer-brand {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.5rem;
}
.footer p {
  color: var(--muted-text);
  margin-bottom: 1.5rem;
}
.footer-grid {
  display: flex;
  justify-content: center;
  gap: 3.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}
.footer-col h4 {
  font-size: 1.08rem;
  color: var(--primary-dark);
  margin-bottom: 0.7rem;
}
.footer-col ul {
  list-style: none;
  padding: 0;
}
.footer-col a {
  color: var(--dark-text);
  text-decoration: none;
  font-size: 1rem;
  transition: color var(--transition);
}
.footer-col a:hover {
  color: var(--primary);
}
.footer-bottom {
  color: #a1a1aa;
  font-size: 0.98rem;
  margin-top: 1.2rem;
}

/* === RESPONSIVE === */
@media (max-width: 900px) {
  .nav-container { padding: 0 1rem; }
  .hackathon-grid { padding: 1.2rem 0.2rem 2rem 0.2rem; }
  .filter-bar { flex-direction: column; align-items: stretch; gap: 1.2rem; }
}
@media (max-width: 700px) {
  .nav-links a { margin-left: 1rem; font-size: 1rem; }
  .footer-grid { gap: 1.5rem; }
  .hackathon-grid { grid-template-columns: 1fr; }
  .filter-bar { padding: 0 0.2rem; }
}
@media (max-width: 600px) {
  .hero-content h1 { font-size: 2rem; }
  .hackathon-card { padding: 1.1rem 0.7rem; }
  .modal-content { padding: 1.2rem 0.7rem; }
  .search-sort-bar { flex-direction: column; gap: 0.7rem; align-items: stretch; }
  #searchInput, #sortSelect { width: 100%; }
}
@media (max-width: 500px) {
  .nav-container { flex-direction: column; gap: 0.7rem; }
  .footer-grid { flex-direction: column; gap: 0.7rem; }
}