/* Go N Chill — Website v4 (Phase 1). Phong cách: biển hiện đại, tươi sáng.
   Thuần CSS, không build step. Tokens ở :root. */

:root {
  /* Palette biển */
  --ocean: #0fb6c6;
  --ocean-deep: #0a7d8c;
  --ocean-ink: #0b3a42;
  --foam: #e9fbf9;
  --foam-2: #d4f4f1;
  --sand: #f8f1e4;
  --sand-deep: #efe3cd;
  --sun: #ffb347;
  --sun-deep: #ff9a3d;
  --coral: #ff6b6b;
  --ink: #0f2b30;
  --muted: #5b7a80;
  --line: #e2eef0;
  --white: #ffffff;

  --grad-ocean: linear-gradient(135deg, #12c2d6 0%, #0a7d8c 100%);
  --grad-sun: linear-gradient(135deg, #ffc05a 0%, #ff8a3d 100%);
  --grad-foam: linear-gradient(180deg, #f3fdfc 0%, #ffffff 100%);

  --shadow-sm: 0 2px 8px rgba(11, 58, 66, .06);
  --shadow: 0 10px 30px rgba(11, 58, 66, .10);
  --shadow-lg: 0 24px 60px rgba(11, 58, 66, .16);

  --r-sm: 10px;
  --r: 16px;
  --r-lg: 24px;
  --r-pill: 999px;

  --font-display: 'Outfit', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --maxw: 1140px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.15; font-weight: 800; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0; }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 44px; }
.eyebrow {
  display: inline-block; font-family: var(--font-display); font-weight: 700;
  text-transform: uppercase; letter-spacing: .14em; font-size: 13px;
  color: var(--ocean-deep); background: var(--foam); padding: 6px 14px;
  border-radius: var(--r-pill); margin-bottom: 14px;
}
.section-title { font-size: clamp(26px, 4vw, 40px); color: var(--ocean-ink); }
.section-sub { color: var(--muted); margin-top: 12px; font-size: 17px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-display); font-weight: 700; font-size: 16px;
  padding: 14px 26px; border-radius: var(--r-pill); border: 0; cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .2s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--grad-sun); color: #4a2600; box-shadow: 0 8px 22px rgba(255,138,61,.35); }
.btn-primary:hover { box-shadow: 0 12px 28px rgba(255,138,61,.45); transform: translateY(-2px); }
.btn-ocean { background: var(--grad-ocean); color: #fff; box-shadow: 0 8px 22px rgba(10,125,140,.32); }
.btn-ocean:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(10,125,140,.42); }
.btn-ghost { background: rgba(255,255,255,.16); color: #fff; border: 1.5px solid rgba(255,255,255,.55); backdrop-filter: blur(4px); }
.btn-ghost:hover { background: rgba(255,255,255,.26); }
.btn-block { width: 100%; }
.btn-lg { padding: 17px 32px; font-size: 17px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.82); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 800; color: var(--ocean-ink); font-size: 19px; }
.brand img { height: 38px; width: auto; }
.nav { display: flex; align-items: center; gap: 26px; }
.nav a { font-weight: 600; color: var(--ocean-ink); font-size: 15px; }
.nav a:hover { color: var(--ocean); }
.nav .btn { padding: 10px 20px; font-size: 15px; }
.nav-links { display: flex; gap: 26px; }

/* Hero */
.hero { position: relative; min-height: 86vh; display: flex; align-items: center; color: #fff; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; background-size: cover; background-position: center; transform: scale(1.04); }
.hero::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(120deg, rgba(8,60,68,.78) 0%, rgba(8,60,68,.35) 55%, rgba(10,125,140,.25) 100%);
}
.hero-inner { position: relative; z-index: 2; max-width: 660px; padding: 40px 0; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.hero-badge { background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.3); padding: 7px 14px; border-radius: var(--r-pill); font-size: 13.5px; font-weight: 600; backdrop-filter: blur(4px); }
.hero h1 { font-size: clamp(34px, 6vw, 60px); letter-spacing: -.01em; }
.hero h1 .accent { color: var(--sun); }
.hero p.lead { font-size: clamp(17px, 2.2vw, 21px); margin: 18px 0 30px; color: rgba(255,255,255,.92); max-width: 560px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-trust { margin-top: 34px; display: flex; gap: 26px; flex-wrap: wrap; }
.hero-trust .stat strong { font-family: var(--font-display); font-size: 26px; display: block; }
.hero-trust .stat span { font-size: 13.5px; color: rgba(255,255,255,.82); }

/* Wave divider */
.wave { display: block; width: 100%; height: 60px; margin-top: -1px; }

/* Products */
.bg-foam { background: var(--grad-foam); }
.product-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.product-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  overflow: hidden; box-shadow: var(--shadow-sm); transition: transform .2s ease, box-shadow .2s ease;
  display: flex; flex-direction: column;
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.product-media { position: relative; aspect-ratio: 16/10; background: var(--foam-2); overflow: hidden; flex: none; }
.product-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.product-tag { position: absolute; top: 14px; left: 14px; background: var(--grad-ocean); color: #fff; font-weight: 700; font-size: 12.5px; padding: 6px 13px; border-radius: var(--r-pill); }
.product-body { padding: 24px; display: flex; flex-direction: column; flex: 1; }
.product-body h3 { font-size: 23px; color: var(--ocean-ink); }
.product-price { margin: 8px 0 4px; font-family: var(--font-display); }
.product-price b { font-size: 30px; color: var(--ocean-deep); }
.product-price span { color: var(--muted); font-weight: 600; font-size: 15px; }
.product-desc { color: var(--muted); font-size: 15px; margin: 10px 0 16px; }
.product-includes { list-style: none; margin: 0 0 22px; display: grid; gap: 9px; }
.product-includes li { position: relative; padding-left: 26px; font-size: 14.5px; color: var(--ink); }
.product-includes li::before { content: '✓'; position: absolute; left: 0; top: 0; color: var(--ocean); font-weight: 800; background: var(--foam); width: 19px; height: 19px; border-radius: 50%; display: grid; place-items: center; font-size: 12px; }
.product-foot { margin-top: auto; }
.addon-note { margin-top: 18px; text-align: center; color: var(--muted); font-size: 14.5px; }
.addon-note b { color: var(--ocean-deep); }

/* USP */
.usp-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.usp-card { background: #fff; border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; box-shadow: var(--shadow-sm); }
.usp-card img { aspect-ratio: 4/3; object-fit: cover; width: 100%; }
.usp-card .usp-txt { padding: 18px; }
.usp-card h4 { font-size: 17px; color: var(--ocean-ink); margin-bottom: 6px; }
.usp-card p { font-size: 14px; color: var(--muted); }

/* Reviews */
.bg-ocean-soft { background: linear-gradient(180deg, var(--foam) 0%, #fff 100%); }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.review-card { background: #fff; border: 1px solid var(--line); border-radius: var(--r); padding: 10px; box-shadow: var(--shadow-sm); }
.review-card img { border-radius: var(--r-sm); width: 100%; }

/* Location */
.location-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center; }
.location-media img { width: 100%; aspect-ratio: 4/3; object-fit: cover; border-radius: var(--r-lg); box-shadow: var(--shadow); }
.location-info .cf-map { font-size: 15px; padding: 12px 22px; margin-bottom: 20px; }
.loc-list { list-style: none; display: grid; gap: 12px; margin-bottom: 18px; }
.loc-list li { position: relative; padding-left: 22px; color: var(--ink); font-size: 15px; line-height: 1.55; }
.loc-list li::before { content: '›'; position: absolute; left: 6px; top: -1px; color: var(--ocean); font-weight: 800; font-size: 18px; }
.loc-hotline { font-size: 15px; color: var(--ink); margin-bottom: 8px; }
.loc-note { font-size: 13.5px; color: var(--muted); }
.location-map { margin-top: 30px; border-radius: var(--r-lg); overflow: hidden; box-shadow: var(--shadow); height: 360px; }
.location-map iframe { width: 100%; height: 100%; border: 0; display: block; }
.cf-mapimg { width: 100%; border-radius: var(--r-sm); margin: 12px 0 4px; border: 1px solid var(--foam-2); }
@media (max-width: 760px) { .location-grid { grid-template-columns: 1fr; } .location-map { height: 280px; } }

/* Booking */
.bg-booking { background: var(--grad-ocean); }
.booking-wrap { display: grid; grid-template-columns: 1fr 360px; gap: 28px; align-items: start; }
.booking-card { background: #fff; border-radius: var(--r-lg); box-shadow: var(--shadow-lg); padding: 30px; }
.booking-card h3 { font-size: 22px; color: var(--ocean-ink); margin-bottom: 4px; }
.booking-card .muted { color: var(--muted); font-size: 14.5px; margin-bottom: 22px; }

.field { margin-bottom: 20px; }
.field > label { display: block; font-weight: 700; font-family: var(--font-display); font-size: 14.5px; color: var(--ocean-ink); margin-bottom: 9px; }
.field .hint { font-weight: 500; color: var(--muted); font-size: 12.5px; }
.input, select.input {
  width: 100%; padding: 13px 15px; border: 1.5px solid var(--line); border-radius: var(--r-sm);
  font-family: var(--font-body); font-size: 15.5px; color: var(--ink); background: #fff; transition: border-color .15s ease, box-shadow .15s ease;
}
.input:focus { outline: none; border-color: var(--ocean); box-shadow: 0 0 0 3px rgba(15,182,198,.15); }

/* choice chips (service + slot) */
.choices { display: grid; gap: 12px; }
.service-choices { grid-template-columns: 1fr 1fr; }
.choice {
  border: 1.5px solid var(--line); border-radius: var(--r-sm); padding: 14px 16px; cursor: pointer;
  display: flex; flex-direction: column; gap: 3px; transition: all .15s ease; background: #fff; position: relative;
}
.choice:hover { border-color: var(--foam-2); background: var(--foam); }
.choice.selected { border-color: var(--ocean); background: var(--foam); box-shadow: 0 0 0 3px rgba(15,182,198,.12); }
.choice .c-title { font-family: var(--font-display); font-weight: 700; font-size: 15.5px; color: var(--ocean-ink); }
.choice .c-meta { font-size: 13px; color: var(--muted); }
.choice.disabled { opacity: .5; cursor: not-allowed; }
.slot-choices { grid-template-columns: 1fr 1fr 1fr; }
.choice .c-remain { font-size: 12px; font-weight: 700; }
.c-remain.ok { color: var(--ocean-deep); }
.c-remain.full { color: var(--coral); }

/* stepper */
.stepper { display: inline-flex; align-items: center; border: 1.5px solid var(--line); border-radius: var(--r-pill); overflow: hidden; }
.stepper button { width: 44px; height: 44px; border: 0; background: var(--foam); color: var(--ocean-deep); font-size: 22px; cursor: pointer; font-weight: 700; }
.stepper button:hover { background: var(--foam-2); }
.stepper input { width: 56px; text-align: center; border: 0; font-size: 17px; font-weight: 700; font-family: var(--font-display); color: var(--ink); }
.stepper input:focus { outline: none; }

/* guide toggle */
.toggle-row { display: flex; align-items: center; gap: 14px; padding: 16px; border: 1.5px solid var(--line); border-radius: var(--r-sm); background: var(--sand); }
.toggle-row .t-txt { flex: 1; }
.toggle-row .t-txt strong { display: block; font-family: var(--font-display); color: var(--ocean-ink); }
.toggle-row .t-txt span { font-size: 13px; color: var(--muted); }
.switch { position: relative; width: 52px; height: 30px; flex: none; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch .slider { position: absolute; inset: 0; background: #cdd9db; border-radius: var(--r-pill); transition: .2s; cursor: pointer; }
.switch .slider::before { content: ''; position: absolute; width: 24px; height: 24px; left: 3px; top: 3px; background: #fff; border-radius: 50%; transition: .2s; box-shadow: var(--shadow-sm); }
.switch input:checked + .slider { background: var(--ocean); }
.switch input:checked + .slider::before { transform: translateX(22px); }

/* Summary sidebar */
.summary { position: sticky; top: 90px; background: #fff; border-radius: var(--r-lg); box-shadow: var(--shadow-lg); padding: 26px; }
.summary h4 { font-size: 18px; color: var(--ocean-ink); margin-bottom: 16px; }
.sum-lines { border-top: 1px dashed var(--line); border-bottom: 1px dashed var(--line); padding: 14px 0; margin-bottom: 14px; min-height: 54px; }
.sum-line { display: flex; justify-content: space-between; font-size: 14.5px; margin: 7px 0; color: var(--ink); }
.sum-line .l { color: var(--muted); }
.sum-line.discount { color: #0a8f4d; font-weight: 600; }
.sum-line.discount .l { color: #0a8f4d; }
.sum-empty { color: var(--muted); font-size: 14px; text-align: center; padding: 6px 0; }
.field .hint.promo-ok { color: #0a8f4d; }
.field .hint.promo-error { color: #d64545; }
.sum-total { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 6px; }
.sum-total .t-label { font-family: var(--font-display); font-weight: 700; color: var(--ocean-ink); }
.sum-total .t-amount { font-family: var(--font-display); font-weight: 800; font-size: 28px; color: var(--ocean-deep); }
.sum-note { font-size: 12.5px; color: var(--muted); margin: 10px 0 18px; }

/* states */
.msg { padding: 12px 15px; border-radius: var(--r-sm); font-size: 14px; margin-bottom: 16px; display: none; }
.msg.error { background: #fff0f0; color: #c0392b; border: 1px solid #ffd5d5; display: block; }
.msg.ok { background: var(--foam); color: var(--ocean-deep); border: 1px solid var(--foam-2); display: block; }
.is-loading { opacity: .6; pointer-events: none; }
.spinner { display: inline-block; width: 16px; height: 16px; border: 2.5px solid rgba(255,255,255,.5); border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Confirmation */
.confirm { text-align: center; padding: 20px 6px; }
.confirm .check { width: 72px; height: 72px; border-radius: 50%; background: var(--grad-ocean); color: #fff; display: grid; place-items: center; font-size: 38px; margin: 0 auto 18px; }
.confirm h3 { font-size: 24px; color: var(--ocean-ink); }
.confirm .code { display: inline-block; margin: 14px 0; font-family: var(--font-display); font-weight: 800; font-size: 22px; letter-spacing: .04em; color: var(--ocean-deep); background: var(--foam); padding: 10px 20px; border-radius: var(--r-sm); }
.confirm > p { color: var(--muted); }
.confirm-lead { max-width: 580px; margin: 0 auto !important; }
.confirm-details { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; text-align: left; margin: 26px 0 18px; align-items: start; }
.cf-card { background: var(--foam); border: 1px solid var(--foam-2); border-radius: var(--r); padding: 18px 20px; }
.cf-card h5 { font-family: var(--font-display); font-size: 15px; color: var(--ocean-ink); margin-bottom: 12px; }
.cf-row { display: flex; justify-content: space-between; gap: 12px; font-size: 14px; padding: 7px 0; border-bottom: 1px dashed var(--foam-2); }
.cf-row:last-child { border-bottom: 0; }
.cf-row span { color: var(--muted); }
.cf-row b { color: var(--ink); text-align: right; }
.cf-addr { font-size: 14px; color: var(--ink); margin-bottom: 12px; }
.cf-map { display: inline-flex; align-items: center; gap: 6px; background: var(--grad-ocean); color: #fff; font-weight: 700; font-size: 13.5px; padding: 9px 15px; border-radius: var(--r-pill); margin-bottom: 14px; }
.cf-map:hover { color: #fff; opacity: .92; }
.cf-list { list-style: none; display: grid; gap: 9px; }
.cf-list li { position: relative; padding-left: 17px; font-size: 13.5px; color: var(--ink); line-height: 1.5; }
.cf-list li::before { content: '•'; position: absolute; left: 3px; color: var(--ocean); font-weight: 800; }
.cf-hotline { margin-top: 12px; font-size: 13.5px; color: var(--ink); }
.confirm .confirm-foot { color: var(--ocean-deep); font-weight: 600; margin-top: 4px; }
@media (max-width: 760px) { .confirm-details { grid-template-columns: 1fr; } }

/* Footer */
.site-footer { background: var(--ocean-ink); color: #cfe9ec; padding: 56px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 36px; margin-bottom: 36px; }
.site-footer h5 { font-family: var(--font-display); color: #fff; font-size: 16px; margin-bottom: 14px; }
.site-footer a { color: #cfe9ec; }
.site-footer a:hover { color: #fff; }
.site-footer .f-brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 800; font-size: 20px; color: #fff; margin-bottom: 12px; }
.site-footer .f-brand img { height: 40px; }
.site-footer p { font-size: 14px; max-width: 320px; }
.site-footer ul { list-style: none; display: grid; gap: 9px; font-size: 14.5px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding-top: 20px; font-size: 13px; color: #9fc4c9; text-align: center; }

/* Responsive */
@media (max-width: 900px) {
  .booking-wrap { grid-template-columns: 1fr; }
  .summary { position: static; }
  .usp-grid { grid-template-columns: repeat(2, 1fr); }
  .review-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}
@media (max-width: 620px) {
  .section { padding: 52px 0; }
  .product-grid { grid-template-columns: 1fr; }
  .service-choices { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { min-height: 78vh; }
}