/* ===========================
   ROOT & RESET
=========================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy: #0d1b3e;
  --navy-light: #162246;
  --gold: #c9a84c;
  --gold-light: #f0c96b;
  --accent: #4f7ef7;
  --accent2: #7c3aed;
  --white: #ffffff;
  --off-white: #f8f9fe;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-400: #94a3b8;
  --gray-600: #475569;
  --gray-800: #1e293b;
  --text: #1a2540;
  --text-light: #64748b;
  --radius: 16px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(13,27,62,.08);
  --shadow-lg: 0 16px 48px rgba(13,27,62,.16);
  --transition: .3s cubic-bezier(.4,0,.2,1);
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', system-ui, sans-serif;
}

html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-body); color: var(--text); background: var(--white); line-height: 1.6; }
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; }
input, select, textarea { font-family: inherit; outline: none; border: none; }

.container { width: 90%; max-width: 1200px; margin: 0 auto; }
.section { padding: 100px 0; }
.section-dark { background: var(--navy); }
.section-alt  { background: var(--off-white); }

/* ===========================
   SCROLLBAR
=========================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--gray-100); }
::-webkit-scrollbar-thumb { background: var(--gold); border-radius: 3px; }

/* ===========================
   TYPOGRAPHY
=========================== */
.section-label {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--gold);
  background: rgba(201,168,76,.12);
  padding: .3rem .9rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}
.section-label.light { color: var(--gold-light); background: rgba(201,168,76,.2); }

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.9rem, 3.5vw, 2.8rem);
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 1rem;
}
.section-title.light { color: var(--white); }
.section-title em { color: var(--gold); font-style: italic; }

.section-desc { color: var(--text-light); max-width: 560px; }
.section-desc.light { color: rgba(255,255,255,.7); }

.section-header { text-align: center; margin-bottom: 60px; }
.section-header .section-desc { margin: 0 auto; }

.section-grid.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }

/* ===========================
   BUTTONS
=========================== */
.btn-primary {
  display: inline-block;
  padding: .85rem 2rem;
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  color: var(--navy);
  font-weight: 700;
  font-size: .95rem;
  border-radius: 999px;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(201,168,76,.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(201,168,76,.45); }
.btn-primary.full-width { width: 100%; text-align: center; }

.btn-ghost {
  display: inline-block;
  padding: .85rem 2rem;
  border: 2px solid rgba(255,255,255,.4);
  color: var(--white);
  font-weight: 600;
  border-radius: 999px;
  transition: var(--transition);
}
.btn-ghost:hover { border-color: var(--gold); color: var(--gold); }

.btn-nav {
  padding: .6rem 1.4rem;
  background: var(--gold);
  color: var(--navy);
  font-weight: 700;
  font-size: .85rem;
  border-radius: 999px;
  transition: var(--transition);
}
.btn-nav:hover { background: var(--gold-light); }

/* ===========================
   NAVBAR
=========================== */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.1rem 0;
  transition: var(--transition);
  background: transparent;
}
#navbar.scrolled {
  background: rgba(13,27,62,.95);
  backdrop-filter: blur(16px);
  padding: .7rem 0;
  box-shadow: 0 2px 24px rgba(0,0,0,.3);
}
.nav-inner { display: flex; align-items: center; gap: 2rem; }
.logo { display: flex; align-items: center; gap: .5rem; }
.logo-icon { font-size: 1.6rem; }
.logo-text { font-family: var(--font-heading); font-size: 1.4rem; font-weight: 700; color: var(--white); }
.logo-text em { color: var(--gold); font-style: normal; }
.nav-links { display: flex; gap: .25rem; margin-left: auto; }
.nav-links a {
  color: rgba(255,255,255,.8);
  font-size: .9rem;
  font-weight: 500;
  padding: .4rem .8rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-links a:hover { color: var(--gold); background: rgba(201,168,76,.1); }
.hamburger { display: none; flex-direction: column; gap: 5px; padding: .3rem; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--white); border-radius: 2px; transition: var(--transition); }

/* ===========================
   HERO
=========================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  color: var(--white);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 50%, rgba(79,126,247,.25) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 10% 80%, rgba(124,58,237,.2) 0%, transparent 50%),
    linear-gradient(160deg, #040e26 0%, #0d1b3e 50%, #0f2460 100%);
  z-index: 0;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 60% 15%, rgba(255,255,255,.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 80% 60%, rgba(201,168,76,.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 35% 70%, rgba(255,255,255,.25) 0%, transparent 100%),
    radial-gradient(1px 1px at 90% 25%, rgba(255,255,255,.3) 0%, transparent 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 140px 0 80px;
  max-width: 680px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  background: rgba(201,168,76,.15);
  border: 1px solid rgba(201,168,76,.3);
  color: var(--gold-light);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .4rem 1rem;
  border-radius: 999px;
  margin-bottom: 1.5rem;
}
.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 7vw, 5.5rem);
  line-height: 1.05;
  margin-bottom: 1.25rem;
  font-weight: 700;
}
.hero-title em { color: var(--gold); font-style: italic; }
.hero-subtitle {
  font-size: 1.1rem;
  color: rgba(255,255,255,.75);
  max-width: 520px;
  margin-bottom: 2.5rem;
  line-height: 1.75;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 3.5rem; }

.hero-stats {
  display: flex;
  gap: 0;
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  backdrop-filter: blur(8px);
  max-width: 520px;
  flex-wrap: wrap;
}
.stat { text-align: center; flex: 1; min-width: 80px; }
.stat-num {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--gold-light);
  display: inline;
}
.stat > span:last-of-type { color: var(--gold-light); font-size: 1.3rem; }
.stat p { font-size: .72rem; color: rgba(255,255,255,.6); margin-top: .25rem; text-transform: uppercase; letter-spacing: .05em; }
.stat-divider { width: 1px; background: rgba(255,255,255,.15); margin: .5rem 1rem; }

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
  color: rgba(255,255,255,.45);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  z-index: 2;
  animation: bounce 2s ease-in-out infinite;
}
.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(255,255,255,.4), transparent);
}
@keyframes bounce { 0%,100%{transform:translateX(-50%) translateY(0)} 50%{transform:translateX(-50%) translateY(8px)} }

/* ===========================
   ABOUT
=========================== */
.about-visual {
  position: relative;
  display: grid;
  gap: 1rem;
}
.about-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
}
.card-main { border-top: 4px solid var(--gold); }
.card-secondary { border-top: 4px solid var(--accent); margin-left: 2rem; }
.card-icon { font-size: 2.5rem; margin-bottom: .75rem; }
.about-card h3 { font-family: var(--font-heading); font-size: 1.3rem; margin-bottom: .5rem; color: var(--navy); }
.about-card p { color: var(--text-light); font-size: .9rem; }
.floating-badge {
  position: absolute;
  background: var(--navy);
  color: var(--gold);
  font-size: .75rem;
  font-weight: 700;
  padding: .4rem .9rem;
  border-radius: 999px;
  border: 2px solid var(--gold);
  white-space: nowrap;
}
.badge-1 { top: -14px; right: 16px; }
.badge-2 { bottom: -14px; left: 50px; }

.about-desc { color: var(--text-light); margin-bottom: 1.75rem; }
.about-features { display: flex; flex-direction: column; gap: 1.25rem; margin-bottom: 2rem; }
.feature-item { display: flex; gap: 1rem; align-items: flex-start; }
.feature-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
  flex-shrink: 0;
  margin-top: .45rem;
}
.feature-item strong { display: block; color: var(--navy); margin-bottom: .2rem; font-size: .95rem; }
.feature-item p { color: var(--text-light); font-size: .88rem; margin: 0; }

/* ===========================
   KURIKULUM / TABS
=========================== */
.semester-tabs { display: flex; gap: .5rem; justify-content: center; flex-wrap: wrap; margin-bottom: 2.5rem; }
.tab-btn {
  padding: .6rem 1.5rem;
  border-radius: 999px;
  font-size: .9rem;
  font-weight: 600;
  color: rgba(255,255,255,.6);
  border: 1px solid rgba(255,255,255,.15);
  transition: var(--transition);
}
.tab-btn.active, .tab-btn:hover {
  background: var(--gold);
  color: var(--navy);
  border-color: var(--gold);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px,1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}
.course-card {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: var(--transition);
  animation: fadeUp .4s ease forwards;
}
.course-card:hover { background: rgba(255,255,255,.1); transform: translateY(-4px); }
.course-sks {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--gold);
  background: rgba(201,168,76,.15);
  padding: .2rem .7rem;
  border-radius: 999px;
  margin-bottom: .75rem;
}
.course-card h4 { color: var(--white); font-size: 1rem; margin-bottom: .4rem; }
.course-card p { color: rgba(255,255,255,.55); font-size: .83rem; }

.sks-total {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  background: rgba(201,168,76,.1);
  border: 1px solid rgba(201,168,76,.25);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
}
.sks-info { text-align: center; }
.sks-info span { display: block; color: rgba(255,255,255,.55); font-size: .8rem; }
.sks-info strong { color: var(--gold-light); font-size: 1.05rem; }

/* ===========================
   KEUNGGULAN
=========================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.adv-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 2rem;
  border: 1px solid var(--gray-200);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.adv-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.adv-icon { font-size: 2.5rem; margin-bottom: 1rem; }
.adv-card h3 { font-size: 1.1rem; color: var(--navy); margin-bottom: .6rem; }
.adv-card p { color: var(--text-light); font-size: .88rem; }
.adv-featured {
  background: linear-gradient(135deg, var(--navy), var(--navy-light));
  border-color: transparent;
  color: var(--white);
}
.adv-featured h3 { color: var(--gold); }
.adv-featured p { color: rgba(255,255,255,.7); }
.adv-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 70% 30%, rgba(79,126,247,.25), transparent 60%);
  pointer-events: none;
}

/* ===========================
   AKTIVITAS PERKULIAHAN
=========================== */
.aktivitas-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; margin-top: 2rem; }
.aktivitas-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  box-shadow: var(--shadow);
  border-top: 4px solid var(--accent);
  text-align: center;
  transition: transform .25s, box-shadow .25s;
}
.aktivitas-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.aktv-num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: var(--white);
  font-size: 1.2rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
}
.aktivitas-card h4 { color: var(--navy); font-size: 1rem; font-weight: 700; margin-bottom: .5rem; }
.aktivitas-card p { color: var(--text-light); font-size: .875rem; line-height: 1.65; }
.aktv-seminar { border-top-color: var(--accent2); }
.aktv-seminar .aktv-num { background: linear-gradient(135deg, var(--accent2), #a855f7); }
.aktv-featured { border-top-color: var(--gold); }
.aktv-featured .aktv-num { background: linear-gradient(135deg, var(--gold), var(--gold-light)); color: var(--navy); }

/* ===========================
   DOSEN
=========================== */
.lecturers-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.lecturer-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}
.lecturer-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.lect-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--white);
  margin: 0 auto 1rem;
}
.lecturer-card h3 { font-size: .95rem; color: var(--navy); margin-bottom: .35rem; line-height: 1.4; }
.lect-role { font-size: .78rem; color: var(--gold); font-weight: 600; margin-bottom: .4rem; }
.lect-expertise { font-size: .8rem; color: var(--text-light); margin-bottom: 1rem; }
.lect-tags { display: flex; gap: .35rem; flex-wrap: wrap; justify-content: center; }
.lect-tags span {
  font-size: .7rem;
  background: var(--gray-100);
  color: var(--text-light);
  padding: .2rem .6rem;
  border-radius: 999px;
}

/* ===========================
   TESTIMONI
=========================== */
.testimonials-wrapper { position: relative; overflow: hidden; }
.testimonials-track { display: flex; gap: 1.5rem; transition: transform .5s cubic-bezier(.4,0,.2,1); }
.testi-card {
  min-width: calc(33.333% - 1rem);
  background: var(--white);
  border-radius: var(--radius);
  padding: 2rem;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
  flex-shrink: 0;
}
.testi-quote { font-family: var(--font-heading); font-size: 5rem; line-height: .5; color: var(--gold); opacity: .4; margin-bottom: .5rem; }
.testi-card p { color: var(--text-light); font-size: .92rem; line-height: 1.7; margin-bottom: 1.5rem; }
.testi-author { display: flex; align-items: center; gap: 1rem; }
.testi-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .8rem;
  font-weight: 700;
  color: var(--white);
  flex-shrink: 0;
}
.testi-author strong { display: block; color: var(--navy); font-size: .9rem; }
.testi-author span { font-size: .78rem; color: var(--text-light); }

.testi-controls { display: flex; align-items: center; justify-content: center; gap: 1rem; margin-top: 2rem; }
.testi-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 2px solid var(--gray-200);
  font-size: 1.1rem;
  color: var(--navy);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.testi-btn:hover { border-color: var(--gold); color: var(--gold); }
.testi-dots { display: flex; gap: .4rem; }
.testi-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gray-200);
  cursor: pointer;
  transition: var(--transition);
  border: none;
}
.testi-dot.active { background: var(--gold); width: 24px; border-radius: 4px; }

/* ===========================
   PENDAFTARAN
=========================== */
.reg-timeline { margin: 2rem 0; display: flex; flex-direction: column; gap: 0; }
.reg-step {
  display: flex;
  gap: 1.25rem;
  padding-bottom: 1.75rem;
  position: relative;
}
.reg-step::before {
  content: '';
  position: absolute;
  left: 17px;
  top: 36px;
  width: 2px;
  height: calc(100% - 16px);
  background: rgba(201,168,76,.3);
}
.reg-step:last-child::before { display: none; }
.step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gold);
  color: var(--navy);
  font-weight: 800;
  font-size: .9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.reg-step h4 { color: var(--white); font-size: .95rem; margin-bottom: .25rem; }
.reg-step p { color: rgba(255,255,255,.6); font-size: .85rem; }
.step-date {
  display: inline-block;
  font-size: .75rem;
  color: var(--gold);
  font-weight: 600;
  margin-top: .25rem;
}

.req-box {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.req-box h4 { color: var(--gold); margin-bottom: 1rem; font-size: .95rem; }
.req-box ul { display: flex; flex-direction: column; gap: .6rem; }
.req-box li {
  color: rgba(255,255,255,.75);
  font-size: .88rem;
  padding-left: 1.25rem;
  position: relative;
}
.req-box li::before { content: '✓'; position: absolute; left: 0; color: var(--gold); font-size: .75rem; }

.form-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
}
.form-card h3 { font-family: var(--font-heading); font-size: 1.5rem; color: var(--navy); margin-bottom: .5rem; }
.form-card > p { color: var(--text-light); font-size: .9rem; margin-bottom: 1.75rem; }
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-size: .85rem; font-weight: 600; color: var(--gray-800); margin-bottom: .45rem; }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: .75rem 1rem;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: .9rem;
  color: var(--text);
  background: var(--off-white);
  transition: var(--transition);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--gold); background: var(--white); box-shadow: 0 0 0 3px rgba(201,168,76,.15); }
.form-group textarea { resize: vertical; }

/* ===========================
   CONTACT BAR
=========================== */
.contact-bar { background: var(--navy-light); border-top: 1px solid rgba(255,255,255,.08); }
.contact-bar-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  padding: 3rem 0;
}
.contact-item { display: flex; gap: 1rem; align-items: flex-start; }
.contact-icon { font-size: 1.5rem; flex-shrink: 0; margin-top: .1rem; }
.contact-item strong { display: block; color: var(--gold); font-size: .85rem; margin-bottom: .25rem; }
.contact-item p { color: rgba(255,255,255,.65); font-size: .85rem; }

/* ===========================
   FOOTER
=========================== */
.footer { background: var(--navy); border-top: 1px solid rgba(255,255,255,.08); padding: 5rem 0 0; }
.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  padding-bottom: 4rem;
}
.footer-brand .logo-text { color: var(--white); }
.footer-brand p { color: rgba(255,255,255,.55); font-size: .88rem; margin-top: 1rem; line-height: 1.7; max-width: 280px; }
.social-links { display: flex; gap: .75rem; margin-top: 1.25rem; }
.social-links a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
}
.social-links a:hover { background: var(--gold); transform: translateY(-2px); }
.footer-links h4, .footer-cta h4 { color: var(--white); font-size: .9rem; margin-bottom: 1.25rem; }
.footer-links ul { display: flex; flex-direction: column; gap: .6rem; }
.footer-links a { color: rgba(255,255,255,.55); font-size: .88rem; transition: var(--transition); }
.footer-links a:hover { color: var(--gold); }
.footer-cta p { color: rgba(255,255,255,.55); font-size: .88rem; margin-bottom: 1.25rem; line-height: 1.6; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 1.5rem 0;
  text-align: center;
}
.footer-bottom p { color: rgba(255,255,255,.35); font-size: .82rem; }

/* ===========================
   BACK TO TOP
=========================== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gold);
  color: var(--navy);
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(201,168,76,.4);
  z-index: 900;
  opacity: 0;
  transform: translateY(16px);
  transition: var(--transition);
  pointer-events: none;
}
.back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover { transform: translateY(-3px); }

/* ===========================
   ANIMATIONS
=========================== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
.reveal { opacity: 0; transform: translateY(32px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width: 1024px) {
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .aktivitas-grid { grid-template-columns: repeat(2, 1fr); }
  .lecturers-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-bar-inner { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .testi-card { min-width: calc(50% - .75rem); }
}

@media (max-width: 768px) {
  .section { padding: 70px 0; }
  .section-grid.two-col { grid-template-columns: 1fr; gap: 40px; }
  .nav-links, .btn-nav { display: none; }
  .hamburger { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--navy);
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    z-index: 999;
  }
  .nav-links.open a { font-size: 1.3rem; }
  .advantages-grid { grid-template-columns: 1fr; }
  .lecturers-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-bar-inner { grid-template-columns: 1fr; gap: 1.5rem; }
  .footer-inner { grid-template-columns: 1fr; }
  .testi-card { min-width: 100%; }
  .hero-stats { flex-direction: column; gap: 1rem; }
  .stat-divider { width: 40px; height: 1px; margin: 0 auto; }
  .card-secondary { margin-left: 0; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 2.8rem; }
  .aktivitas-grid { grid-template-columns: 1fr; }
  .lecturers-grid { grid-template-columns: 1fr; }
  .semester-tabs { gap: .35rem; }
  .tab-btn { padding: .5rem 1rem; font-size: .82rem; }
}