/* ============ Landing page ============ */
.land-top {
  position: sticky; top: 0; z-index: 50;
  background: rgba(15, 118, 110, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.land-top-inner {
  max-width: 1180px; margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; gap: 20px;
}
.brand { display: flex; align-items: center; gap: 9px; color: #fff; font-weight: 800; font-size: 20px; text-decoration: none; }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid; place-items: center; width: 32px; height: 32px;
  background: #fff; color: var(--primary-dark); border-radius: 9px; font-size: 22px; font-weight: 800;
}
.land-nav { margin-left: auto; display: flex; align-items: center; gap: 18px; }
.land-nav a { color: #fff; font-weight: 600; font-size: 14px; text-decoration: none; opacity: .92; }
.land-nav a:hover { opacity: 1; text-decoration: none; }
.land-nav .btn { opacity: 1; }
.btn-outline-light { background: transparent; border: 1.5px solid rgba(255,255,255,.7); color: #fff; }
.btn-outline-light:hover { background: rgba(255,255,255,.15); }
.land-menu-btn {
  margin-left: auto; display: none; background: rgba(255,255,255,.18); border: none; color: #fff;
  width: 42px; height: 42px; border-radius: 10px;
}
.land-drawer {
  position: fixed; top: 0; right: 0; bottom: 0; width: 260px; max-width: 80vw; background: #fff;
  z-index: 70; transform: translateX(100%); transition: transform .28s; display: flex; flex-direction: column;
}
.land-drawer.open { transform: translateX(0); }
.land-drawer-head { display: flex; align-items: center; justify-content: space-between; padding: 16px; background: var(--primary-dark); color: #fff; }
.land-drawer nav { padding: 16px; display: flex; flex-direction: column; gap: 6px; }
.land-drawer nav a { padding: 12px 14px; border-radius: 10px; color: var(--neutral-700); font-weight: 600; text-decoration: none; }
.land-drawer nav a:hover { background: var(--primary-50); text-decoration: none; }
.land-drawer nav .btn { margin-top: 8px; }

/* hero */
.hero {
  position: relative; min-height: 86vh; display: grid; place-items: center; padding: 60px 20px;
  background:
    linear-gradient(135deg, rgba(13,148,136,.85), rgba(8,145,178,.78)),
    url('https://images.pexels.com/photos/6129870/pexels-photo-6129870.jpeg?auto=compress&cs=tinysrgb&w=1600') center/cover no-repeat;
  color: #fff; text-align: center;
}
.hero-overlay { position: absolute; inset: 0; background: rgba(15,23,42,.18); }
.hero-content { position: relative; max-width: 760px; }
.hero-badge {
  display: inline-block; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.3);
  padding: 6px 16px; border-radius: 999px; font-size: 13px; font-weight: 600; margin-bottom: 18px;
}
.hero h1 { font-size: clamp(28px, 5vw, 48px); font-weight: 800; line-height: 1.15; margin-bottom: 16px; letter-spacing: -.5px; }
.hero p { font-size: clamp(15px, 2vw, 18px); opacity: .95; max-width: 620px; margin: 0 auto 26px; line-height: 1.6; }
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 30px; justify-content: center; margin-top: 40px; flex-wrap: wrap; }
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 28px; font-weight: 800; }
.hero-stats span { font-size: 13px; opacity: .85; }

/* sections */
.section { padding: 70px 20px; }
.section-alt { background: #fff; }
.section-inner { max-width: 1100px; margin: 0 auto; }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: clamp(24px, 4vw, 34px); font-weight: 800; color: var(--neutral-900); }
.section-head p { color: var(--neutral-500); margin-top: 8px; font-size: 16px; }

/* features */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; }
.feature-card {
  background: #fff; border-radius: var(--radius-lg); padding: 26px 22px; border: 1px solid var(--neutral-200);
  box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-ic {
  width: 54px; height: 54px; border-radius: 14px; background: var(--primary-50);
  display: grid; place-items: center; font-size: 26px; margin-bottom: 14px;
}
.feature-card h3 { font-size: 18px; font-weight: 700; color: var(--neutral-900); margin-bottom: 6px; }
.feature-card p { color: var(--neutral-600); font-size: 14.5px; line-height: 1.6; }

/* courses */
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.course-card {
  background: linear-gradient(160deg, #fff, var(--neutral-50)); border-radius: var(--radius-lg);
  padding: 24px 20px; border: 1px solid var(--neutral-200); position: relative; overflow: hidden;
  transition: transform .2s, box-shadow .2s;
}
.course-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.course-ic { font-size: 38px; margin-bottom: 12px; }
.course-badge {
  position: absolute; top: 14px; right: 14px; background: var(--warning); color: #fff;
  font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 999px;
}
.course-card h3 { font-size: 17px; font-weight: 700; color: var(--neutral-900); margin-bottom: 4px; }
.course-card p { color: var(--neutral-600); font-size: 14px; }

/* about */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.about-title { font-size: clamp(24px, 4vw, 32px); font-weight: 800; color: var(--neutral-900); margin-bottom: 12px; }
.about-text { color: var(--neutral-600); font-size: 16px; line-height: 1.7; margin-bottom: 18px; }
.about-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.about-list li { display: flex; gap: 12px; align-items: flex-start; color: var(--neutral-700); font-size: 15px; }
.about-list span { color: var(--success); font-weight: 800; }
.about-img {
  height: 360px; border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(13,148,136,.35), rgba(8,145,178,.3)),
    url('https://images.pexels.com/photos/5722160/pexels-photo-5722160.jpeg?auto=compress&cs=tinysrgb&w=900') center/cover no-repeat;
  box-shadow: var(--shadow-lg);
}

/* footer */
.land-foot { background: var(--neutral-900); color: #fff; padding: 50px 20px 24px; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 30px; }
.foot-grid div { display: flex; flex-direction: column; gap: 8px; }
.foot-grid strong { margin-bottom: 4px; font-size: 14px; }
.foot-grid a { color: var(--neutral-400); font-size: 14px; text-decoration: none; }
.foot-grid a:hover { color: #fff; text-decoration: none; }
.foot-bottom { border-top: 1px solid var(--neutral-800); margin-top: 30px; padding-top: 20px; text-align: center; color: var(--neutral-500); font-size: 13px; }

/* responsive */
@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 700px) {
  .land-nav { display: none; }
  .land-menu-btn { display: grid; place-items: center; }
  .hero { min-height: 78vh; }
  .hero-stats { gap: 20px; }
  .section { padding: 50px 16px; }
}
@media (max-width: 480px) {
  .foot-grid { grid-template-columns: 1fr; }
  .hero-cta .btn { width: 100%; }
}