/* ============================================
   assets/css/style.css
   SIT19 - Main Stylesheet
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:ital,wght@0,300;0,400;0,500;1,300&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  --bg-dark:      #05050f;
  --bg-card:      #0d0d1f;
  --bg-glass:     rgba(255,255,255,0.04);
  --accent-blue:  #3d7eff;
  --accent-violet:#8b5cf6;
  --accent-cyan:  #06b6d4;
  --text-primary: #f0f0ff;
  --text-muted:   #7a7a9a;
  --border:       rgba(255,255,255,0.08);
  --gradient:     linear-gradient(135deg, var(--accent-blue), var(--accent-violet));
  --gradient-soft:linear-gradient(135deg, rgba(61,126,255,0.15), rgba(139,92,246,0.15));
  --font-display: 'Syne', sans-serif;
  --font-body:    'DM Sans', sans-serif;
  --radius:       16px;
  --radius-sm:    8px;
  --shadow:       0 20px 60px rgba(0,0,0,0.5);
  --transition:   0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- 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-dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ---------- Noise Texture Overlay ---------- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--accent-violet); border-radius: 3px; }

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
}
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  background: rgba(6,182,212,0.1);
  border: 1px solid rgba(6,182,212,0.2);
  border-radius: 100px;
  padding: 6px 16px;
  margin-bottom: 20px;
}
.section-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  margin-bottom: 16px;
}
.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 600px;
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
section { padding: 100px 0; position: relative; z-index: 1; }
.section-header { margin-bottom: 60px; }

/* ============================================
   NAVBAR
   ============================================ */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: padding 0.4s cubic-bezier(0.4,0,0.2,1),
              background 0.4s cubic-bezier(0.4,0,0.2,1),
              border-color 0.4s cubic-bezier(0.4,0,0.2,1),
              box-shadow 0.4s cubic-bezier(0.4,0,0.2,1);
  border-bottom: 1px solid transparent;
}
#navbar.scrolled {
  background: rgba(5,5,15,0.88);
  backdrop-filter: blur(24px) saturate(160%);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
  box-shadow: 0 4px 32px rgba(0,0,0,0.35);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
  z-index: 1001;
}
.logo-badge {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.8rem;
  color: #fff;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  flex-shrink: 0;
}
.nav-logo:hover .logo-badge {
  transform: rotate(-6deg) scale(1.08);
  box-shadow: 0 6px 20px rgba(61,126,255,0.4);
}
.logo-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
}
.logo-sub {
  font-size: 0.65rem;
  color: var(--text-muted);
  display: block;
  font-weight: 400;
}
.nav-links {
  display: flex;
  list-style: none;
  gap: 36px;
  align-items: center;
}
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.3s ease;
  position: relative;
  white-space: nowrap;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--gradient);
  border-radius: 2px;
  transition: width 0.3s cubic-bezier(0.4,0,0.2,1);
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { width: 100%; }
.nav-cta {
  background: var(--gradient);
  color: #fff !important;
  padding: 10px 24px;
  border-radius: 100px;
  font-weight: 600 !important;
  font-size: 0.85rem !important;
  box-shadow: 0 4px 16px rgba(61,126,255,0.3);
  transition: opacity 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease !important;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover {
  opacity: 0.92;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(61,126,255,0.45) !important;
}

/* ---- Hamburger Button ---- */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  border-radius: 10px;
  background: transparent;
  border: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease;
  position: relative;
  z-index: 1001;
  width: 44px; height: 44px;
}
.hamburger:hover {
  background: var(--bg-glass);
  border-color: var(--border);
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  position: absolute;
  left: 50%; transform: translateX(-50%);
  transition: transform 0.35s cubic-bezier(0.4,0,0.2,1),
              opacity   0.25s ease,
              top       0.35s cubic-bezier(0.4,0,0.2,1);
}
.hamburger span:nth-child(1) { top: 13px; }
.hamburger span:nth-child(2) { top: 21px; }
.hamburger span:nth-child(3) { top: 29px; }

/* Hamburger → X saat open */
.hamburger.open span:nth-child(1) {
  top: 21px;
  transform: translateX(-50%) rotate(45deg);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
  transform: translateX(calc(-50% + 8px));
}
.hamburger.open span:nth-child(3) {
  top: 21px;
  transform: translateX(-50%) rotate(-45deg);
}

/* ---- Mobile Overlay (backdrop) ---- */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 998;
  opacity: 0;
  transition: opacity 0.35s ease;
}
.mobile-overlay.open {
  display: block;
  opacity: 1;
}

/* ============================================
   HERO
   ============================================ */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -20%, rgba(61,126,255,0.15) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(139,92,246,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 40% 40% at 10% 80%, rgba(6,182,212,0.08) 0%, transparent 60%);
  pointer-events: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 8px 20px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  backdrop-filter: blur(10px);
}
.hero-tag span { color: var(--accent-cyan); }
.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
}
.hero-desc {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 40px;
  max-width: 500px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 8px 30px rgba(61,126,255,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(61,126,255,0.5); }
.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
}
.btn-outline:hover { border-color: var(--accent-blue); background: rgba(61,126,255,0.05); }

.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 48px;
}
.stat { text-align: left; }
.stat-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 0.8rem; color: var(--text-muted); }

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-orb {
  width: 420px; height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61,126,255,0.2) 0%, rgba(139,92,246,0.15) 40%, transparent 70%);
  position: relative;
  animation: float 6s ease-in-out infinite;
}
.hero-orb::before {
  content: '';
  position: absolute;
  inset: 20px;
  border-radius: 50%;
  border: 1px solid rgba(61,126,255,0.2);
  animation: spin 20s linear infinite;
}
.hero-orb::after {
  content: '';
  position: absolute;
  inset: 60px;
  border-radius: 50%;
  border: 1px dashed rgba(139,92,246,0.15);
  animation: spin 30s linear infinite reverse;
}
.orb-center {
  position: absolute;
  inset: 0;
  display: flex; align-items: center; justify-content: center;
}
.orb-logo {
  width: 120px; height: 120px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.8rem;
  color: #fff;
}
.floating-card {
  position: absolute;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.8rem;
  backdrop-filter: blur(10px);
  display: flex; align-items: center; gap: 8px;
  box-shadow: var(--shadow);
}
.floating-card.card-1 { top: 20%; right: -10%; animation: float 4s ease-in-out infinite; }
.floating-card.card-2 { bottom: 25%; left: -8%; animation: float 5s ease-in-out infinite 1s; }
.floating-card.card-3 { top: 60%; right: 5%; animation: float 4.5s ease-in-out infinite 0.5s; }
.floating-card.card-4 { top: 20%; left: 5%; animation: float 4.5s ease-in-out infinite 0.5s; }

@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

/* ============================================
   ABOUT
   ============================================ */
#about { background: var(--gradient-soft); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}
.badge {
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.visi-misi { display: flex; flex-direction: column; gap: 24px; }
.vm-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}
.vm-card:hover { border-color: var(--accent-blue); transform: translateY(-4px); }
.vm-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient);
  opacity: 0;
  transition: var(--transition);
}
.vm-card:hover::before { opacity: 1; }
.vm-icon {
  width: 44px; height: 44px;
  background: var(--gradient);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 16px;
}
.vm-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.vm-card ul { padding-left: 18px; color: var(--text-muted); font-size: 0.9rem; }
.vm-card ul li { margin-bottom: 6px; }

/* ============================================
   DIVISIONS
   ============================================ */
.divisions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.division-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
  cursor: default;
  position: relative;
  overflow: hidden;
}
.division-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-soft);
  opacity: 0;
  transition: var(--transition);
}
.division-card:hover { border-color: var(--accent-violet); transform: translateY(-6px); box-shadow: 0 20px 50px rgba(0,0,0,0.3); }
.division-card:hover::after { opacity: 1; }
.div-icon {
  width: 60px; height: 60px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
  position: relative; z-index: 1;
}
.div-icon.blue { background: rgba(61,126,255,0.15); }
.div-icon.violet { background: rgba(139,92,246,0.15); }
.div-icon.cyan { background: rgba(6,182,212,0.15); }
.div-icon.green { background: rgba(16,185,129,0.15); }
.division-card h3 { font-size: 1.15rem; margin-bottom: 10px; position: relative; z-index: 1; }
.division-card p { color: var(--text-muted); font-size: 0.9rem; position: relative; z-index: 1; }

/* ============================================
   PROJECTS
   ============================================ */
#projects { background: var(--gradient-soft); }
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}
.project-card:hover { transform: translateY(-6px); box-shadow: 0 20px 50px rgba(0,0,0,0.3); border-color: var(--accent-blue); }
.project-img {
  width: 100%; height: 180px;
  background: var(--gradient);
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}
.project-img img { width: 100%; height: 100%; object-fit: cover; }
.project-body { padding: 24px; }
.project-tag {
  display: inline-block;
  background: rgba(61,126,255,0.15);
  color: var(--accent-blue);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}
.project-body h3 { font-size: 1.05rem; margin-bottom: 8px; }
.project-body p { color: var(--text-muted); font-size: 0.875rem; line-height: 1.6; }

/* ============================================
   DOCUMENTATION
   ============================================ */
.docs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}
.doc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}
.doc-card:hover { transform: translateY(-4px); border-color: var(--accent-violet); }
.doc-media {
  width: 100%; height: 220px;
  background: linear-gradient(135deg, #0d0d2e, #1a1a3e);
  position: relative;
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.doc-media img { width: 100%; height: 100%; object-fit: cover; }
.doc-media video { width: 100%; height: 100%; object-fit: cover; }
.doc-media-placeholder { font-size: 3rem; opacity: 0.3; }
.doc-body { padding: 20px; }
.doc-title { font-size: 1rem; font-weight: 600; margin-bottom: 8px; }
.doc-desc { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 16px; }
.doc-meta {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 16px;
}
.doc-date { font-size: 0.78rem; color: var(--text-muted); }
.doc-actions { display: flex; gap: 12px; align-items: center; }
.like-btn {
  display: flex; align-items: center; gap: 6px;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 6px 14px;
  font-size: 0.8rem;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition);
}
.like-btn:hover, .like-btn.liked { color: #ef4444; border-color: rgba(239,68,68,0.3); background: rgba(239,68,68,0.05); }
.comment-toggle {
  display: flex; align-items: center; gap: 6px;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 6px 14px;
  font-size: 0.8rem;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition);
}
.comment-toggle:hover { color: var(--accent-blue); border-color: rgba(61,126,255,0.3); }
.comment-section { margin-top: 16px; border-top: 1px solid var(--border); padding-top: 16px; display: none; }
.comment-section.open { display: block; }
.comment-list { max-height: 200px; overflow-y: auto; margin-bottom: 12px; }
.comment-item {
  padding: 10px;
  background: var(--bg-glass);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  font-size: 0.82rem;
}
.comment-item strong { color: var(--accent-cyan); }
.comment-form { display: flex; flex-direction: column; gap: 8px; }
.comment-form input,
.comment-form textarea {
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.85rem;
  color: var(--text-primary);
  font-family: var(--font-body);
  transition: var(--transition);
}
.comment-form input:focus,
.comment-form textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  background: rgba(61,126,255,0.05);
}
.comment-form textarea { resize: none; height: 70px; }
.comment-submit {
  background: var(--gradient);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.comment-submit:hover { opacity: 0.9; }

/* ============================================
   REGISTRATION FORM
   ============================================ */
#register { background: var(--gradient-soft); }
.register-wrap {
  max-width: 700px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 48px;
}
.register-closed {
  text-align: center;
  padding: 48px;
}
.register-closed .icon { font-size: 3rem; margin-bottom: 16px; }
.register-closed h3 { font-size: 1.4rem; margin-bottom: 10px; }
.register-closed p { color: var(--text-muted); }
.form-group { margin-bottom: 20px; }
.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-muted);
}
.form-control {
  width: 100%;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 18px;
  font-size: 0.95rem;
  color: var(--text-primary);
  font-family: var(--font-body);
  transition: var(--transition);
}
.form-control:focus {
  outline: none;
  border-color: var(--accent-blue);
  background: rgba(61,126,255,0.04);
  box-shadow: 0 0 0 3px rgba(61,126,255,0.1);
}
.form-control::placeholder { color: var(--text-muted); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
select.form-control option { background: #1a1a2e; }
textarea.form-control { resize: vertical; min-height: 120px; }
.form-msg {
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 20px;
  display: none;
}
.form-msg.success { background: rgba(16,185,129,0.1); border: 1px solid rgba(16,185,129,0.3); color: #10b981; }
.form-msg.error { background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.3); color: #ef4444; }

/* ============================================
   CONTACT
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.contact-info h2 { font-size: 2.2rem; margin-bottom: 16px; }
.contact-info p { color: var(--text-muted); margin-bottom: 36px; }
.contact-items { display: flex; flex-direction: column; gap: 16px; }
.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.contact-item:hover { border-color: var(--accent-blue); }
.contact-item-icon {
  width: 44px; height: 44px;
  background: var(--gradient-soft);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-item-text small { font-size: 0.75rem; color: var(--text-muted); }
.contact-item-text span { display: block; font-size: 0.9rem; }
.social-links { display: flex; gap: 12px; margin-top: 24px; }
.social-btn {
  width: 44px; height: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  transition: var(--transition);
  text-decoration: none;
}
.social-btn:hover { background: var(--gradient); border-color: transparent; transform: translateY(-2px); }

/* ============================================
   FOOTER
   ============================================ */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  text-align: center;
}
footer p { color: var(--text-muted); font-size: 0.85rem; }
footer span { color: var(--accent-violet); }

/* ============================================
   SCROLL REVEAL ANIMATION
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   TOAST NOTIFICATION
   ============================================ */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  font-size: 0.9rem;
  z-index: 9999;
  transform: translateX(120%);
  transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
  box-shadow: var(--shadow);
  max-width: 300px;
}
.toast.show { transform: translateX(0); }
.toast.toast-success { border-left: 3px solid #10b981; }
.toast.toast-error { border-left: 3px solid #ef4444; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 992px) {
  .hero-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .form-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  section { padding: 70px 0; }

  /* Tampilkan hamburger, sembunyikan desktop nav */
  .hamburger { display: flex; }
  .nav-links {
    /* Reset dari display:flex desktop */
    display: flex;
    flex-direction: column;
    list-style: none;
    gap: 0;

    /* Posisi: drawer dari kanan */
    position: fixed;
    top: 0; right: 0; bottom: 0;
    width: min(320px, 85vw);
    background: rgba(10,10,28,0.97);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-left: 1px solid var(--border);
    z-index: 999;
    padding: 100px 32px 40px;

    /* Animasi slide-in dari kanan */
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.4,0,0.2,1);

    /* Shadow depth */
    box-shadow: -20px 0 60px rgba(0,0,0,0.5);
  }

  /* State terbuka */
  .nav-links.open {
    transform: translateX(0);
  }

  /* Setiap item link */
  .nav-links li {
    opacity: 0;
    transform: translateX(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
  }
  .nav-links.open li {
    opacity: 1;
    transform: translateX(0);
  }
  /* Stagger delay tiap item */
  .nav-links.open li:nth-child(1) { transition-delay: 0.08s; }
  .nav-links.open li:nth-child(2) { transition-delay: 0.13s; }
  .nav-links.open li:nth-child(3) { transition-delay: 0.18s; }
  .nav-links.open li:nth-child(4) { transition-delay: 0.23s; }
  .nav-links.open li:nth-child(5) { transition-delay: 0.28s; }
  .nav-links.open li:nth-child(6) { transition-delay: 0.33s; }

  .nav-links a {
    display: flex;
    align-items: center;
    padding: 16px 0;
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    transition: color 0.25s ease, padding-left 0.25s ease;
    gap: 10px;
  }
  .nav-links a:hover {
    color: var(--text-primary);
    padding-left: 8px;
  }
  .nav-links a::after { display: none; }
  .nav-links li:last-child a { border-bottom: none; }

  /* CTA button di dalam drawer */
  .nav-links .nav-cta {
    display: flex;
    justify-content: center;
    margin-top: 24px;
    padding: 14px 24px !important;
    border-radius: var(--radius-sm) !important;
    font-size: 0.95rem !important;
    width: 100%;
    text-align: center;
    border-bottom: none !important;
  }
  .nav-links .nav-cta:hover {
    padding-left: 24px !important;
  }

  /* Drawer brand kecil di bagian bawah */
  .nav-links::after {
    content: 'SIT19 © ' attr(data-year);
    display: block;
    margin-top: auto;
    padding-top: 32px;
    font-size: 0.72rem;
    color: var(--text-muted);
    opacity: 0.5;
    letter-spacing: 0.08em;
  }

  /* Saat navbar scrolled di mobile: padding lebih rapat */
  #navbar.scrolled { padding: 8px 0; }

  .register-wrap { padding: 28px 20px; }
  .hero-stats { gap: 20px; }
}

@media (max-width: 480px) {
  .hero-title { font-size: clamp(2rem, 10vw, 2.8rem); }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .hero-stats { flex-wrap: wrap; gap: 16px 28px; }
  .stat-num { font-size: 1.6rem; }
  .logo-sub { display: none; }
}

@media (max-width: 360px) {
  .container { padding: 0 16px; }
}