/* ===================== Tokens ===================== */
:root {
  --blue: #2563EB;
  --blue-400: #60A5FA;
  --blue-600: #1D4ED8;
  --blue-700: #1E40AF;
  --cyan: #06B6D4;
  --ink: #0F172A;
  --ink-2: #1E293B;
  --muted: #64748B;
  --line: #E2E8F0;
  --bg: #FFFFFF;
  --surface: #F8FAFC;
  --surface-2: #F1F5F9;
  --dark: #070C18;
  --dark-2: #0B1220;
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1120px;
  --shadow: 0 10px 30px rgba(15, 23, 42, .08);
  --shadow-hover: 0 18px 50px rgba(37, 99, 235, .18);
  --glow: 0 0 0 1px rgba(37, 99, 235, .12), 0 8px 30px rgba(37, 99, 235, .14);
  --font: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}

/* ===================== Base ===================== */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ===================== Buttons ===================== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 13px 26px; border-radius: 999px;
  font-weight: 600; font-size: 15px; cursor: pointer; border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
}
.btn--primary {
  background: linear-gradient(135deg, var(--blue), var(--blue-600));
  color: #fff; box-shadow: 0 8px 24px rgba(37,99,235,.35);
}
.btn--primary:hover { background: linear-gradient(135deg, var(--blue-600), var(--blue-700)); transform: translateY(-2px); box-shadow: 0 12px 30px rgba(37,99,235,.45); }
.btn--ghost { background: rgba(255,255,255,.10); color: #fff; border-color: rgba(255,255,255,.5); }
.btn--ghost:hover { background: rgba(255,255,255,.22); border-color: rgba(255,255,255,.75); }
.btn--full { width: 100%; }

/* ===================== Nav ===================== */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid rgba(226,232,240,.85);
}
.nav__inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; gap: 18px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.brand__logo { width: 34px; height: 34px; border-radius: 8px; }
.brand__name { font-size: 17px; letter-spacing: .2px; }
.nav__links { margin-left: auto; display: flex; gap: 26px; }
.nav__links a { font-size: 15px; color: var(--ink-2); font-weight: 500; position: relative; padding: 4px 0; }
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: var(--blue); transition: width .2s ease;
}
.nav__links a:hover { color: var(--blue); }
.nav__links a:hover::after { width: 100%; }
.nav__right { display: flex; align-items: center; gap: 12px; }
.nav__burger { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 6px; }
.nav__burger span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: .2s; }

/* ===================== Hero ===================== */
.hero {
  position: relative; min-height: 92vh; display: flex; align-items: center;
  background: url("../assets/henggang-aerial.png") center/cover no-repeat;
  color: #fff; overflow: hidden;
}
.hero__overlay {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(7,12,24,.50), rgba(7,12,24,.88)),
    linear-gradient(135deg, rgba(37,99,235,.32), rgba(6,182,212,.10));
}
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(96,165,250,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(96,165,250,.08) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: linear-gradient(180deg, transparent 0%, rgba(0,0,0,.45) 25%, rgba(0,0,0,.2) 100%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, rgba(0,0,0,.45) 25%, rgba(0,0,0,.2) 100%);
  pointer-events: none;
}
.hero__grid::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 70% 30%, rgba(37,99,235,.18), transparent 45%);
}
.hero__content { position: relative; max-width: var(--maxw); margin: 0 auto; padding: 110px 24px; width: 100%; }
.hero__eyebrow { text-transform: uppercase; letter-spacing: 3.5px; font-size: 13px; color: var(--blue-400); font-weight: 700; }
.hero__title { font-size: clamp(44px, 7.5vw, 84px); font-weight: 700; line-height: 1.05; margin: 14px 0 18px; letter-spacing: -1px; }
.hero__sub { font-size: clamp(17px, 2.4vw, 22px); max-width: 640px; color: #D6E2F5; }
.hero__stats { display: flex; flex-wrap: wrap; gap: 40px; margin: 44px 0 36px; }
.stat__num { font-size: 36px; font-weight: 700; color: #fff; }
.stat__plus { font-size: 20px; color: var(--blue-400); }
.stat__label { font-size: 13px; color: #A9B9D9; margin-top: 2px; text-transform: uppercase; letter-spacing: 1px; }
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }

/* ===================== Sections ===================== */
.section { padding: 96px 0; position: relative; }
.section--alt { background: var(--surface); }
.section--dark { background: var(--dark); color: #E6ECF8; }
.section__eyebrow { text-transform: uppercase; letter-spacing: 2.5px; font-size: 12px; color: var(--blue); font-weight: 700; }
.section__title { font-size: clamp(28px, 4.2vw, 42px); font-weight: 700; margin: 10px 0 28px; line-height: 1.2; letter-spacing: -.5px; }
.section__title--light { color: #fff; }
.prose p { color: var(--ink-2); margin-bottom: 16px; max-width: 820px; }
.prose--center { text-align: center; }
.prose--center p { margin: 0 auto 8px; }
.section--dark .prose p { color: #C7D2E6; }

/* ===================== Park cards ===================== */
.park-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; margin-top: 12px; }
.park-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px; box-shadow: var(--shadow); transition: transform .25s ease, box-shadow .25s ease;
  position: relative; overflow: hidden;
}
.park-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--cyan)); opacity: .85;
}
.park-card:hover { transform: translateY(-6px); box-shadow: var(--glow); }
.tag {
  display: inline-block; font-size: 12px; font-weight: 600; color: var(--blue);
  background: #EAF1FF; border-radius: 999px; padding: 5px 12px; margin-bottom: 14px;
}
.park-card__name { font-size: 24px; font-weight: 700; margin-bottom: 8px; }
.park-card__desc { color: var(--muted); margin-bottom: 20px; }
.park-card__metrics {
  list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 14px;
  padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); margin-bottom: 18px;
}
.park-card__metrics li { display: flex; flex-direction: column; }
.park-card__metrics strong { font-size: 22px; color: var(--ink); font-weight: 700; }
.park-card__metrics .unit { font-size: 14px; color: var(--muted); font-weight: 600; }
.park-card__metrics span:last-child { font-size: 12.5px; color: var(--muted); }
.park-card__body p { font-size: 14.5px; color: var(--ink-2); margin-bottom: 12px; }

/* ===================== Offer grid ===================== */
.offer-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 30px 0 26px; }
.offer {
  border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 20px 18px;
  background: #fff; font-weight: 500; transition: border-color .2s ease, background .2s ease, transform .2s ease;
  position: relative;
}
.offer:hover { border-color: var(--blue); background: #F5F8FF; transform: translateY(-3px); }
.offer::before {
  content: ""; position: absolute; left: 0; top: 16px; bottom: 16px; width: 3px;
  background: linear-gradient(180deg, var(--blue), var(--cyan)); border-radius: 0 2px 2px 0; opacity: 0; transition: opacity .2s ease;
}
.offer:hover::before { opacity: 1; }
.price-note { text-align: center; color: var(--ink-2); background: var(--surface-2); border-radius: var(--radius-sm); padding: 16px 20px; }
.center-cta { text-align: center; margin-top: 24px; }

/* ===================== Investment ===================== */
.invest-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.invest-col { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.invest-col__title { font-size: 20px; font-weight: 700; margin-bottom: 16px; color: var(--blue-700); }
.invest-list { list-style: none; display: flex; flex-direction: column; gap: 14px; }
.invest-list li { padding-left: 18px; position: relative; color: var(--ink-2); font-size: 14.5px; }
.invest-list li::before { content: ""; position: absolute; left: 0; top: 9px; width: 7px; height: 7px; border-radius: 50%; background: var(--blue); }

/* ===================== Advantages ===================== */
.adv-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.adv {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 18px; background: #fff;
  transition: transform .25s ease, box-shadow .25s ease; position: relative; overflow: hidden;
}
.adv:hover { transform: translateY(-5px); box-shadow: var(--glow); }
.adv::after {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--cyan)); opacity: .7;
}
.adv__no { font-size: 13px; font-weight: 700; color: var(--blue); letter-spacing: 1px; }
.adv h4 { font-size: 17px; margin: 10px 0 8px; }
.adv p { font-size: 13.5px; color: var(--muted); }

/* ===================== Contact ===================== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact-list { list-style: none; margin-top: 22px; display: flex; flex-direction: column; gap: 16px; }
.contact-list li { display: flex; gap: 14px; align-items: baseline; }
.contact-list__k { min-width: 76px; font-weight: 600; color: #9DB8FF; font-size: 13px; text-transform: uppercase; letter-spacing: 1px; }
.contact-list__v { color: #EAF1FF; font-size: 15px; }
.booking-form { background: #fff; border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); display: grid; gap: 14px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 13px; font-weight: 600; color: var(--ink-2); }
.field input, .field select, .field textarea {
  font-family: inherit; font-size: 14.5px; padding: 11px 13px; border: 1px solid var(--line);
  border-radius: var(--radius-sm); background: var(--surface); color: var(--ink); transition: border-color .15s ease, box-shadow .15s ease;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--blue); background: #fff; box-shadow: 0 0 0 3px rgba(37,99,235,.10); }
.field textarea { resize: vertical; }
.form-status { font-size: 14px; font-weight: 600; padding: 10px 12px; border-radius: var(--radius-sm); }
.form-status.ok { background: #E7F6EC; color: #157347; }
.form-status.err { background: #FDECEC; color: #C0392B; }

/* ===================== Footer ===================== */
.footer { background: var(--dark-2); color: #9DB8FF; padding: 26px 0; font-size: 13.5px; }
.footer__inner { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.footer__domain { font-weight: 700; color: #fff; letter-spacing: .5px; }

/* ===================== Responsive ===================== */
@media (max-width: 900px) {
  .park-grid, .invest-grid, .contact-grid { grid-template-columns: 1fr; }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .offer-grid { grid-template-columns: repeat(2, 1fr); }
  .nav__links {
    position: absolute; top: 100%; right: 0; left: 0;
    flex-direction: column; gap: 0; background: #fff; border-bottom: 1px solid var(--line);
    padding: 8px 24px 16px; display: none;
  }
  .nav__links.open { display: flex; }
  .nav__links a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav__burger { display: flex; }
}
@media (max-width: 540px) {
  .adv-grid, .offer-grid { grid-template-columns: 1fr; }
  .hero__stats { gap: 22px; }
  .section { padding: 64px 0; }
}