/* Vincent Flow — Vietnamese education landing (IA after Wylerin Uni; own brand) */

:root {
  --bg: #f6f6f7;
  --white: #ffffff;
  --ink: #0A2540;
  --muted: #3d5a73;
  --line: #d5e3ee;
  --accent: #0A2540;
  --accent-dark: #061828;
  --accent-soft: #e7f8fb;
  --band: #0A2540;
  --max: 1120px;
  --gutter: clamp(18px, 4vw, 40px);
  --radius: 18px;
  --shadow: 0 10px 28px rgba(28, 28, 28, .08);
  --sans: "Be Vietnam Pro", "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
h1, h2, h3, p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
::selection { background: var(--accent); color: var(--white); }

.page { width: min(var(--max), 100%); margin: 0 auto; padding-inline: var(--gutter); }
.icon { width: 1.05em; height: 1.05em; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--white);
  font-size: .9rem;
  font-weight: 600;
  transition: background .15s ease, transform .15s ease;
}
.btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  color: var(--accent);
}
.btn-ghost:hover { background: var(--accent-soft); color: var(--accent-dark); transform: none; }
.btn-ink { background: var(--ink); border-color: var(--ink); color: var(--white); }
.btn-ink:hover { background: #061828; border-color: #061828; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255,255,255,.92);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(12px);
}
.site-header.scrolled { border-bottom-color: var(--line); }
.nav-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 76px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -.02em;
  white-space: nowrap;
}
.brand img { width: 42px; height: 42px; border-radius: 50%; }
.brand span { color: var(--accent); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
  font-size: .92rem;
  font-weight: 500;
  color: #3f3f3f;
}
.nav-links a:hover { color: var(--accent); }
.nav-cta { margin-left: 8px; }
.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  margin-left: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--white);
}
.menu-button span { display: block; width: 16px; height: 1.6px; margin: 5px auto; background: var(--ink); }

/* Hero */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, .95fr);
  align-items: center;
  gap: clamp(28px, 5vw, 72px);
  padding: clamp(36px, 6vw, 72px) 0 clamp(48px, 7vw, 88px);
}
.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2.15rem, 4.6vw, 3.35rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.03em;
}
.hero-lead { max-width: 34rem; color: var(--muted); font-size: 1.05rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-visual {
  position: relative;
  min-height: 340px;
  padding: 28px 22px 22px;
  border-radius: 28px;
  background: radial-gradient(circle at 78% 18%, #d7f6fb 0, transparent 42%),
              linear-gradient(180deg, #fff 0%, #f4fcfe 100%);
}
.desk {
  width: min(100%, 420px);
  margin: 36px auto 0;
  overflow: visible;
}
.float-icon {
  position: absolute;
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  background: var(--white);
  border: 1px solid #d5e3ee;
  border-radius: 14px;
  box-shadow: var(--shadow);
}
.float-icon svg { width: 30px; height: 30px; stroke: var(--ink); fill: none; }
.fi-1 { top: 18px; right: 28px; }
.fi-2 { top: 108px; left: 8px; }
.fi-3 { bottom: 86px; right: 12px; }
.fi-4 { bottom: 22px; left: 42px; }

/* Stats band */
.band {
  background: var(--band);
  color: var(--white);
  padding: 56px 0 72px;
}
.band h2 { text-align: center; font-size: clamp(1.7rem, 3vw, 2.1rem); font-weight: 700; }
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 32px;
}
.stat {
  padding: 28px 18px;
  background: var(--white);
  color: var(--ink);
  border-radius: 16px;
  text-align: center;
  box-shadow: var(--shadow);
}
.stat strong {
  display: block;
  color: var(--accent);
  font-size: clamp(2rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.1;
}
.stat span { display: block; margin-top: 8px; color: var(--muted); font-size: .92rem; }

/* Roles */
.roles { padding: 64px 0 24px; text-align: center; }
.roles h2 { font-size: 1.55rem; }
.role-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 22px;
}
.role-row span {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg);
  font-size: .88rem;
  font-weight: 600;
}

/* Courses */
.courses { padding: 40px 0 80px; background: linear-gradient(#fff, #e7f8fb 40%, #fff); }
.courses h2 { text-align: center; font-size: clamp(1.7rem, 3vw, 2.1rem); margin-bottom: 28px; }
.course-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}
.course-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--white);
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.course-cover {
  position: relative;
  min-height: 168px;
  padding: 22px 22px 18px;
  color: var(--white);
  background: #0A2540;
  overflow: hidden;
}
.course-cover::after {
  content: "";
  position: absolute;
  inset: auto -20px -40px auto;
  width: 160px;
  height: 160px;
  border: 18px solid rgba(255,255,255,.08);
  border-radius: 40px;
  transform: rotate(18deg);
  pointer-events: none;
}
.course-cover.cover-main {
  background:
    radial-gradient(circle at 86% 12%, rgba(255,255,255,.18), transparent 38%),
    linear-gradient(145deg, #061828 0%, #0A2540 55%, #2EC4E0 140%);
}
.course-cover.cover-a { background: linear-gradient(135deg, #0A2540, #2EC4E0); }
.course-cover.cover-b { background: linear-gradient(135deg, #061828, #0A2540); }
.course-cover.cover-c { background: linear-gradient(135deg, #0A2540, #16324f); }
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.16);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.course-cover h3 { margin-top: 14px; font-size: 1.28rem; font-weight: 800; line-height: 1.3; }
.cover-meta { margin-top: 12px; font-size: .82rem; opacity: .88; }
.course-body { display: flex; flex-direction: column; gap: 16px; padding: 22px; flex: 1; }
.course-body p { color: var(--muted); font-size: .95rem; }
.meta-list { display: grid; gap: 8px; padding-top: 8px; border-top: 1px solid var(--line); font-size: .9rem; }
.meta-list li { display: flex; justify-content: space-between; gap: 12px; }
.meta-list span { color: var(--muted); }
.course-body .btn { align-self: flex-end; margin-top: auto; }

.featured { grid-column: 1 / -1; display: grid; grid-template-columns: 1.15fr .85fr; }
.featured .course-cover { min-height: 100%; }
.featured .course-body { padding: 28px; }

/* Outline peek */
.outline-peek { padding: 8px 0 72px; }
.outline-peek h2 { font-size: 1.7rem; margin-bottom: 8px; }
.outline-peek .lede { color: var(--muted); margin-bottom: 22px; }
.session-table { border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.session-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
}
.session-row:last-child { border-bottom: 0; }
.session-row b { color: var(--accent); font-size: .82rem; }
.session-row strong { display: block; font-size: 1rem; }
.session-row p { color: var(--muted); font-size: .9rem; }
.outline-peek .more { display: inline-block; margin-top: 18px; color: var(--accent); font-weight: 700; }

/* Trainer */
.trainer { padding: 24px 0 80px; }
.trainer h2 { text-align: center; font-size: 1.7rem; margin-bottom: 24px; }
.trainer-card {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 28px;
  max-width: 760px;
  margin: 0 auto;
  padding: 22px;
  background: var(--bg);
  border-radius: 20px;
}
.trainer-mark {
  display: grid;
  place-items: center;
  background: var(--white);
  border-radius: 16px;
}
.trainer-mark img { width: 140px; height: 140px; }
.trainer-card h3 { font-size: 1.35rem; }
.trainer-card ul { margin-top: 12px; display: grid; gap: 8px; color: var(--muted); }
.trainer-card li { padding-left: 14px; position: relative; }
.trainer-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

/* Proof */
.proof { padding: 56px 0; background: var(--bg); }
.proof h2 { text-align: center; font-size: 1.7rem; }
.proof-note { max-width: 40rem; margin: 10px auto 28px; text-align: center; color: var(--muted); }
.proof-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.proof-grid article {
  padding: 22px;
  background: var(--white);
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.proof-grid h3 { font-size: 1.05rem; margin-bottom: 8px; }
.proof-grid p { color: var(--muted); font-size: .92rem; }

/* Posts */
.posts { padding: 72px 0; }
.posts h2 { text-align: center; font-size: 1.7rem; margin-bottom: 24px; }
.post-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.post-card {
  display: flex;
  flex-direction: column;
  min-height: 220px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
}
.post-card time { color: var(--accent); font-size: .78rem; font-weight: 700; }
.post-card h3 { margin: 10px 0 8px; font-size: 1.05rem; }
.post-card p { color: var(--muted); font-size: .9rem; }
.post-card .more { margin-top: auto; padding-top: 16px; color: var(--accent); font-weight: 700; }

/* Contact */
.contact {
  padding: 64px 0;
  background: var(--band);
  color: var(--white);
  text-align: center;
}
.contact h2 { font-size: 1.7rem; }
.contact-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px 28px;
  margin-top: 22px;
  font-weight: 600;
}
.contact-row a:hover { text-decoration: underline; }
.contact .btn { margin-top: 24px; background: var(--white); color: var(--accent); border-color: var(--white); }
.contact .btn:hover { background: var(--accent-soft); }

/* Footer */
footer { padding: 36px 0 28px; background: #0A2540; color: #e7f8fb; }
.footer-main { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.footer-main p { max-width: 28rem; color: #9ec4d4; font-size: .9rem; }
.footer-main a { color: #e7f8fb; }
.footer-cols { display: flex; gap: 48px; }
.footer-cols p { margin-bottom: 8px; color: #fff; font-weight: 700; }
.footer-cols a { display: block; color: #9ec4d4; font-size: .9rem; margin-top: 6px; }
.footer-cols a:hover { color: #fff; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid #16324f;
  color: #9ec4d4;
  font-size: .8rem;
}

/* Inner pages */
.page-hero { padding: 48px 0 12px; }
.page-hero h1 { font-size: clamp(1.9rem, 4vw, 2.6rem); font-weight: 800; letter-spacing: -.03em; }
.page-hero p { max-width: 40rem; margin-top: 12px; color: var(--muted); }
.syllabus { padding: 12px 0 64px; display: grid; gap: 14px; }
.syllabus article {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--white);
}
.syllabus header { display: flex; gap: 14px; align-items: baseline; }
.syllabus header b { color: var(--accent); font-size: .82rem; }
.syllabus h2 { font-size: 1.15rem; }
.syllabus p { margin-top: 8px; color: var(--muted); }
.pricing { padding: 8px 0 64px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.price-card {
  padding: 28px 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--white);
}
.price-card.featured { border-color: var(--accent); box-shadow: var(--shadow); }
.price-card h3 { font-size: 1.1rem; }
.price-card .amount { margin: 12px 0 4px; font-size: 1.7rem; font-weight: 800; color: var(--accent); }
.price-card .regular { color: var(--muted); font-size: .9rem; }
.price-card ul { margin: 16px 0 22px; display: grid; gap: 8px; }
.price-card li { padding-left: 18px; position: relative; color: var(--muted); font-size: .92rem; }
.price-card li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
.signup { display: grid; gap: 14px; max-width: 32rem; padding-bottom: 64px; }
.signup label { display: grid; gap: 6px; font-weight: 600; }
.signup input, .signup textarea, .signup select { font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; }
.note { margin: 0 0 48px; color: var(--muted); font-size: .92rem; }
.faq { padding: 0 0 72px; }
.faq h2 { margin-bottom: 16px; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq details p { padding: 0 0 16px; color: var(--muted); }

.will-reveal { transform: translateY(10px); transition: transform .4s ease; }
.will-reveal.in, .reveal.in { transform: none; }

@media (max-width: 900px) {
  .hero, .featured, .trainer-card, .pricing { grid-template-columns: 1fr; }
  .stats, .course-grid, .proof-grid, .post-grid { grid-template-columns: 1fr; }
  .featured .course-cover { min-height: 180px; }
  .nav-cta { display: none; }
  .menu-button { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 76px;
    left: var(--gutter);
    right: var(--gutter);
    margin-left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 16px; }
}

@media (max-width: 640px) {
  .stats { grid-template-columns: 1fr; }
  .float-icon { width: 52px; height: 52px; }
  .hero-visual { min-height: 280px; }
}