/* =========================================================
   Hello Vietnam Adventures — Design System
   ========================================================= */
:root {
  /* Brand */
  --red: #E31D2B;
  --red-deep: #B8141F;
  --yellow: #FFD200;
  --yellow-soft: #FFE770;
  --green: #007A33;
  --green-deep: #005A24;

  /* Neutrals */
  --cream: #F9F7F2;
  --cream-warm: #F2EEE4;
  --ink: #2C3E50;
  --ink-soft: #5A6B7A;
  --line: #E6E1D4;
  --white: #FFFFFF;

  /* Type */
  --font-display: "Fredoka", system-ui, sans-serif;
  --font-body: "Montserrat", system-ui, sans-serif;

  /* Geom */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-xl: 32px;
  --r-pill: 999px;

  --shadow-sm: 0 1px 2px rgba(44,62,80,.06), 0 2px 8px rgba(44,62,80,.04);
  --shadow-md: 0 4px 14px rgba(44,62,80,.08), 0 10px 30px rgba(44,62,80,.06);
  --shadow-lg: 0 14px 40px rgba(44,62,80,.14);

  --container: 1240px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-size: 16px;
  line-height: 1.55;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0;
  text-wrap: balance;
}
h1 { font-size: clamp(2.2rem, 4.4vw, 4rem); line-height: 1.02; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.8rem, 3vw, 2.6rem); line-height: 1.1; }
h3 { font-size: 1.35rem; line-height: 1.2; }
h4 { font-size: 1.05rem; }

p { text-wrap: pretty; margin: 0; }

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
input, textarea, select { font-family: inherit; font-size: inherit; color: inherit; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 28px; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 40;
  background: rgba(249,247,242,0.82);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 600; font-size: 1.15rem;
  letter-spacing: -0.01em;
}
.logo-mark {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--red);
  display: grid; place-items: center;
  color: var(--yellow);
  font-family: var(--font-display); font-weight: 600;
  position: relative;
  box-shadow: inset 0 0 0 3px var(--yellow-soft), var(--shadow-sm);
}
.logo-mark::after {
  content: "★"; font-size: 18px; color: var(--yellow);
}
.nav-links { display: flex; gap: 6px; }
.nav-link {
  padding: 8px 14px; border-radius: var(--r-pill);
  font-weight: 500; font-size: 0.92rem;
  color: var(--ink); transition: background .15s, color .15s;
}
.nav-link:hover { background: var(--cream-warm); }
.nav-link.active { background: var(--ink); color: var(--cream); }
.nav-cta {
  padding: 10px 18px; border-radius: var(--r-pill);
  background: var(--red); color: var(--white);
  font-weight: 600; font-size: 0.9rem;
  box-shadow: 0 4px 12px rgba(227,29,43,.25);
  transition: transform .15s, box-shadow .15s;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(227,29,43,.35); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 24px; border-radius: var(--r-pill);
  font-family: var(--font-display); font-weight: 500; font-size: 1rem;
  transition: transform .15s, box-shadow .2s, background .15s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--red); color: var(--white);
  box-shadow: 0 6px 18px rgba(227,29,43,.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(227,29,43,.4); }
.btn-yellow {
  background: var(--yellow); color: var(--ink);
  box-shadow: 0 6px 18px rgba(255,210,0,.4);
}
.btn-yellow:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(255,210,0,.55); }
.btn-ghost {
  background: transparent; color: var(--ink);
  border: 1.5px solid var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: var(--cream); }
.btn-green {
  background: var(--green); color: var(--white);
  box-shadow: 0 6px 18px rgba(0,122,51,.3);
}
.btn-green:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0,122,51,.4); }

/* ---------- Placeholder imagery ---------- */
.ph {
  position: relative; overflow: hidden;
  background: var(--cream-warm);
  background-size: cover;
  background-position: center;
  border-radius: var(--r-md);
  display: grid; place-items: center;
  color: var(--ink-soft);
}
.ph.has-photo::before { display: none; }
.ph.has-photo .ph-label { display: none; }
.ph::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    repeating-linear-gradient(135deg, transparent 0 14px, rgba(44,62,80,.04) 14px 15px);
}
.ph-label {
  position: relative; z-index: 1;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.72rem;
  color: var(--ink-soft);
  background: rgba(249,247,242,.85);
  padding: 4px 10px; border-radius: var(--r-pill);
  border: 1px solid var(--line);
  text-transform: uppercase; letter-spacing: 0.04em;
}
.ph.red { background-color: #F7D9DC; color: var(--red-deep); }
.ph.red::before { background-image: repeating-linear-gradient(135deg, transparent 0 14px, rgba(227,29,43,.07) 14px 15px); }
.ph.yellow { background-color: #FFF3B0; color: #6B4F00; }
.ph.yellow::before { background-image: repeating-linear-gradient(135deg, transparent 0 14px, rgba(255,210,0,.25) 14px 15px); }
.ph.green { background-color: #CDE5D6; color: var(--green-deep); }
.ph.green::before { background-image: repeating-linear-gradient(135deg, transparent 0 14px, rgba(0,122,51,.1) 14px 15px); }
.ph.ink { background-color: #D7DDE2; color: var(--ink); }
.ph.ink::before { background-image: repeating-linear-gradient(135deg, transparent 0 14px, rgba(44,62,80,.08) 14px 15px); }
/* Belt-and-braces: any .ph carrying a photo always covers + centers. */
.ph.has-photo { background-size: cover !important; background-position: center !important; background-repeat: no-repeat !important; }

/* ---------- Badges ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: var(--r-pill);
  font-size: 0.75rem; font-weight: 600;
  letter-spacing: 0.02em;
}
.badge-red { background: #FDE4E6; color: var(--red-deep); }
.badge-yellow { background: #FFF3B0; color: #8a6d00; }
.badge-green { background: #D5EADC; color: var(--green-deep); }
.badge-ink { background: var(--cream-warm); color: var(--ink); }

/* ---------- Section ---------- */
.section { padding: 96px 0; }
.section-tight { padding: 64px 0; }
.eyebrow {
  display: inline-block;
  font-size: 0.8rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--red);
  margin-bottom: 12px;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--ink); color: var(--cream);
  padding: 64px 0 28px;
  margin-top: 0;
}
.footer a { color: var(--cream); opacity: 0.75; }
.footer a:hover { opacity: 1; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px;
  margin-bottom: 48px;
}
.footer h4 { color: var(--yellow); font-family: var(--font-display); margin-bottom: 16px; font-size: 0.95rem; letter-spacing: 0.06em; text-transform: uppercase; }
.footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; font-size: 0.92rem; }
.footer-bottom {
  border-top: 1px solid rgba(249,247,242,.12);
  padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.82rem; opacity: 0.6;
}
.socials { display: flex; gap: 10px; }
.social-ico {
  width: 38px; height: 38px; border-radius: 50%;
  border: 1px solid rgba(249,247,242,.25);
  display: grid; place-items: center;
  transition: background .15s, color .15s;
}
.social-ico:hover { background: var(--yellow); color: var(--ink); border-color: var(--yellow); }

/* ---------- Forms ---------- */
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 0.82rem; font-weight: 600; color: var(--ink); }
.field .hint { font-size: 0.75rem; color: var(--ink-soft); }
.input, .textarea, .select {
  width: 100%;
  padding: 13px 16px;
  background: var(--white);
  border: 1.5px solid var(--line);
  border-radius: var(--r-md);
  font-size: 0.95rem;
  transition: border-color .15s, box-shadow .15s;
  outline: none;
}
.input:focus, .textarea:focus, .select:focus {
  border-color: var(--red);
  box-shadow: 0 0 0 4px rgba(227,29,43,.1);
}
.textarea { min-height: 110px; resize: vertical; font-family: inherit; }
.lead-input::placeholder { color: var(--ink-soft); opacity: 1; }

/* ---------- Card ---------- */
.card {
  background: var(--white);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform .18s, box-shadow .18s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

/* Scrollbar polish */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--ink-soft); }

/* Utilities */
.grid { display: grid; }
.flex { display: flex; }
.hidden { display: none !important; }

/* Tweaks Panel */
.tweaks-panel {
  position: fixed; right: 20px; bottom: 20px; z-index: 100;
  width: 290px;
  background: var(--white);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--line);
  font-family: var(--font-body);
  overflow: hidden;
}
.tweaks-head {
  padding: 14px 18px;
  background: var(--ink); color: var(--cream);
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-display); font-weight: 500;
}
.tweaks-body { padding: 16px 18px; display: flex; flex-direction: column; gap: 14px; }
.tweak-row { display: flex; flex-direction: column; gap: 6px; }
.tweak-row label { font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--ink-soft); }
.tweak-swatches { display: flex; gap: 8px; }
.tweak-sw {
  width: 32px; height: 32px; border-radius: 50%;
  border: 2px solid var(--line);
  cursor: pointer;
  transition: transform .15s, border-color .15s;
}
.tweak-sw.active { border-color: var(--ink); transform: scale(1.1); }

/* Page transitions */
.page-enter { animation: fadeUp .35s ease; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Theme variants (tweakable) */
body[data-accent="red"]   { --accent: var(--red); }
body[data-accent="green"] { --accent: var(--green); }
body[data-accent="yellow"] { --accent: var(--yellow); }

/* Responsive */
@media (max-width: 860px) {
  .nav-links { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .section { padding: 64px 0; }
}