/* ============================================================
   THẠCH TUYỀN — onsen stone & water minimalism
   ============================================================ */

:root {
  --ink-900: #14181b;
  --ink-700: #262b2e;
  --stone-500: #767d80;
  --stone-300: #b7bbbd;
  --steam-50: #f8f5f0;
  --steam-100: #f1ece3;
  --water-700: #1e3a40;
  --water-600: #24444c;
  --ember-500: #be5e34;
  --ember-600: #a34f2b;

  --radius-lg: 28px;
  --radius-md: 16px;
  --radius-sm: 8px;

  --shadow-soft: 0 20px 60px -24px rgba(20, 24, 27, 0.4);
  --shadow-card: 0 12px 32px -18px rgba(20, 24, 27, 0.28);

  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);

  --font-display: "Fraunces", serif;
  --font-body: "Work Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --container: 1280px;

  --z-base: 0;
  --z-card: 10;
  --z-sticky: 100;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--steam-50);
  color: var(--ink-900);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-wrap: pretty;
}

h1, h2, h3, blockquote {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.12;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; }

a { color: inherit; text-decoration: none; }

ul, ol, dl { margin: 0; padding: 0; list-style: none; }

img { max-width: 100%; display: block; }

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

.icon-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: -5px;
}

.icon-sm { width: 14px; height: 14px; stroke-width: 1.6; vertical-align: -2px; }

/* Fixed grain overlay — see performance-guardrails: fixed pseudo-layer only */
.grain {
  position: fixed;
  inset: 0;
  z-index: 500;
  pointer-events: none;
  opacity: 0.035;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ============ HEADER ============ */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(248, 245, 240, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(20, 24, 27, 0.08);
}

.header-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: 0.01em;
}

.main-nav {
  display: none;
  gap: 32px;
  font-size: 0.92rem;
  color: var(--ink-700);
}

.main-nav a {
  position: relative;
  padding-block: 4px;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--ember-500);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 320ms var(--ease-spring);
}

.main-nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  height: 1.5px;
  background: var(--ink-900);
}

.main-nav.is-open {
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--steam-50);
  padding: 16px 24px 24px;
  border-bottom: 1px solid rgba(20, 24, 27, 0.08);
}

.main-nav.is-open a { padding-block: 10px; }

@media (min-width: 860px) {
  .main-nav { display: flex; position: static; padding: 0; border: none; background: none; flex-direction: row; }
  .nav-toggle { display: none; }
}

/* ============ BUTTONS ============ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: transform 220ms var(--ease-spring), box-shadow 220ms var(--ease-spring);
}

.btn-ember {
  background: var(--ember-500);
  color: var(--steam-50);
  box-shadow: 0 10px 24px -10px rgba(190, 94, 52, 0.55);
}

.btn-ember:hover {
  background: var(--ember-600);
  transform: translateY(-2px);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-small { padding: 10px 20px; font-size: 0.88rem; display: none; }

@media (min-width: 860px) {
  .btn-small { display: inline-flex; }
}

.btn-link {
  font-size: 0.95rem;
  font-weight: 500;
  border-bottom: 1px solid var(--stone-300);
  padding-bottom: 2px;
  transition: border-color 220ms var(--ease-spring), transform 220ms var(--ease-spring);
  display: inline-block;
}

.btn-link:hover {
  border-color: var(--ember-500);
  transform: translateX(4px);
}

/* ============ HERO ============ */

.hero {
  display: grid;
  grid-template-columns: 1fr;
  min-height: 100dvh;
}

@media (min-width: 960px) {
  .hero {
    grid-template-columns: 1.35fr 1fr;
    align-items: stretch;
  }
}

.hero-copy {
  padding: 56px 24px 64px;
  display: flex;
  flex-direction: column;
  gap: 28px;
  justify-content: center;
  max-width: 640px;
}

@media (min-width: 960px) {
  .hero-copy { padding: 0 32px 0 clamp(24px, 6vw, 96px); }
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.1rem);
  color: var(--ink-900);
}

.hero-lede {
  font-size: 1.08rem;
  color: var(--ink-700);
  max-width: 46ch;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
}

.hero-footnote {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--stone-500);
}

.hero-visual {
  position: relative;
  min-height: 340px;
  overflow: hidden;
  background: linear-gradient(165deg, var(--water-700) 0%, var(--water-600) 46%, var(--ink-900) 100%);
}

.hero-photo {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 58%;
  display: block;
}

.stone-layer {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(ellipse at 22% 12%, rgba(241, 236, 227, 0.1), transparent 50%),
    linear-gradient(180deg, rgba(20, 24, 27, 0.05) 0%, rgba(20, 24, 27, 0.6) 100%);
}

.steam-wisp {
  position: absolute;
  z-index: 2;
  bottom: 18%;
  width: 90px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(241, 236, 227, 0.22), transparent 70%);
  filter: blur(18px);
  animation: rise 9s ease-in-out infinite;
  will-change: transform, opacity;
}

.w1 { left: 22%; animation-delay: 0s; }
.w2 { left: 52%; animation-delay: 3s; width: 70px; height: 180px; }
.w3 { left: 74%; animation-delay: 6s; width: 100px; height: 240px; }

@keyframes rise {
  0%   { transform: translateY(0) scale(1); opacity: 0; }
  15%  { opacity: 0.7; }
  75%  { opacity: 0.25; }
  100% { transform: translateY(-160px) scale(1.3); opacity: 0; }
}

.readout-card {
  position: absolute;
  z-index: 3;
  left: 50%;
  bottom: 40px;
  transform: translateX(-50%);
  background: rgba(20, 24, 27, 0.55);
  border: 1px solid rgba(241, 236, 227, 0.18);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  backdrop-filter: blur(10px);
}

.readout-value {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  color: var(--steam-100);
}

.readout-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--stone-300);
  letter-spacing: 0.03em;
}

@media (min-width: 960px) {
  .hero-visual { min-height: 100%; }
}

/* ============ PHILOSOPHY ============ */

.philosophy {
  padding: 96px 0;
  background: var(--steam-50);
}

.philosophy-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
  display: grid;
  gap: 48px;
}

@media (min-width: 900px) {
  .philosophy-inner {
    grid-template-columns: 1fr 0.9fr;
    gap: 80px;
    align-items: start;
  }
}

.pull-quote {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  color: var(--water-700);
}

.philosophy-body p {
  font-size: 1.05rem;
  color: var(--ink-700);
  max-width: 52ch;
}

.fact-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid rgba(20, 24, 27, 0.1);
}

.fact dt {
  font-size: 0.78rem;
  color: var(--stone-500);
  margin-bottom: 8px;
}

.fact dd {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  color: var(--ember-600);
  margin: 0;
}

/* ============ RITUAL ============ */

.ritual {
  padding: 96px 0 80px;
  background: var(--water-700);
  color: var(--steam-100);
}

.section-head {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
  margin-bottom: 56px;
  max-width: 640px;
}

.ritual .section-head { max-width: var(--container); padding-inline: 24px; }

.section-head h2 {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  margin-bottom: 14px;
}

.section-head p {
  color: var(--stone-300);
  font-size: 1rem;
  max-width: 48ch;
}

.ritual .section-head p { color: rgba(241, 236, 227, 0.65); }

.ritual-list {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
  position: relative;
}

.ritual-list::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: rgba(241, 236, 227, 0.18);
}

@media (min-width: 640px) {
  .ritual-list::before { left: 44px; }
}

.ritual-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  padding: 28px 0;
  border-bottom: 1px solid rgba(241, 236, 227, 0.1);
  align-items: baseline;
  position: relative;
}

.ritual-step:last-child { border-bottom: none; }

.step-marker {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ember-500);
}

.step-marker .icon { width: 20px; height: 20px; }

.step-index {
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

@media (min-width: 640px) {
  .step-marker { gap: 14px; }
  .step-index { font-size: 1.05rem; }
}

.step-body h3 {
  font-size: 1.4rem;
  margin-bottom: 6px;
  color: var(--steam-100);
}

.step-body p {
  color: rgba(241, 236, 227, 0.6);
  font-size: 0.95rem;
  max-width: 42ch;
}

.step-readout {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--stone-300);
  letter-spacing: 0.02em;
  margin-top: 4px;
}

@media (min-width: 720px) {
  .ritual-step {
    grid-template-columns: auto 1fr auto;
    align-items: center;
  }
  .step-readout {
    grid-column: 3;
    text-align: right;
    margin-top: 0;
  }
}

.ritual-note {
  max-width: var(--container);
  margin-inline: auto;
  padding: 32px 24px 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: rgba(241, 236, 227, 0.45);
}

/* ============ SERVICES ============ */

.services {
  padding: 96px 0;
  background: var(--steam-50);
}

.services .section-head { padding-inline: 24px; margin-inline: auto; max-width: var(--container); }

.service-grid {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 780px) {
  .service-grid {
    grid-template-columns: repeat(3, 1fr);
    grid-auto-rows: minmax(180px, auto);
  }
  .service-card--wide { grid-column: span 2; }
}

.service-card {
  background: var(--steam-100);
  border-radius: var(--radius-md);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  justify-content: space-between;
  border: 1px solid rgba(20, 24, 27, 0.06);
  transition: transform 260ms var(--ease-spring), box-shadow 260ms var(--ease-spring);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.service-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(20, 24, 27, 0.12);
  border-radius: var(--radius-sm);
  color: var(--ember-600);
}

.service-card h3 {
  font-size: 1.25rem;
  color: var(--ink-900);
}

.service-card p {
  color: var(--ink-700);
  font-size: 0.95rem;
  max-width: 44ch;
}

.service-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--water-700);
  padding-top: 8px;
  border-top: 1px dashed rgba(20, 24, 27, 0.15);
}

/* ============ TESTIMONIALS ============ */

.testimonials {
  padding: 88px 0 40px;
  background: var(--steam-50);
  max-width: var(--container);
  margin-inline: auto;
}

.testimonial-track {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-inline: 24px;
  padding-bottom: 4px;
}

.testimonial-track::-webkit-scrollbar { display: none; }

.testimonial-track .testimonial {
  flex: 0 0 86%;
  scroll-snap-align: center;
}

.testimonial-progress {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 32px;
}

.testimonial-progress-seg {
  width: 26px;
  height: 2px;
  border-radius: 1px;
  background: rgba(20, 24, 27, 0.15);
  transition: background 260ms var(--ease-spring), width 260ms var(--ease-spring);
}

.testimonial-progress-seg.is-active {
  background: var(--ember-500);
  width: 36px;
}

@media (min-width: 860px) {
  .testimonials { padding-bottom: 96px; padding-inline: 24px; }
  .testimonial-track {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    overflow: visible;
    padding-inline: 0;
  }
  .testimonial-track .testimonial { flex: none; scroll-snap-align: none; }
  .testimonial--b { margin-top: 64px; }
  .testimonial-progress { display: none; }
}

.testimonial p {
  font-family: var(--font-display);
  font-size: 1.3rem;
  line-height: 1.4;
  color: var(--ink-900);
  margin-bottom: 20px;
}

.testimonial cite {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--stone-500);
}

/* ============ LOCATION ============ */

.location {
  background: var(--water-600);
  color: var(--steam-100);
  padding: 88px 0;
}

.location-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
  display: grid;
  gap: 40px;
}

@media (min-width: 860px) {
  .location-inner { grid-template-columns: 1fr 1fr; align-items: center; }
}

.location-info h2 { font-size: clamp(1.8rem, 3.5vw, 2.4rem); margin-bottom: 20px; }

.location-address {
  font-size: 1.1rem;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ember-500);
}

.location-address .icon { color: var(--ember-500); }

.hours-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.hours-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: rgba(241, 236, 227, 0.6);
  margin-bottom: 4px;
}

.hours-heading .icon { width: 16px; height: 16px; }

.hours-list > div:not(.hours-heading) {
  display: flex;
  justify-content: space-between;
  max-width: 320px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  border-bottom: 1px dashed rgba(241, 236, 227, 0.2);
  padding-bottom: 8px;
}

.hours-list dt { color: rgba(241, 236, 227, 0.6); }

.location-contact {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--ember-500);
  display: flex;
  align-items: center;
  gap: 8px;
}

.location-contact .icon { width: 18px; height: 18px; }

.location-map {
  position: relative;
  display: block;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(241, 236, 227, 0.15);
}

.location-map img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 420ms var(--ease-spring);
}

.location-map:hover img { transform: scale(1.04); }

.map-cta {
  position: absolute;
  left: 16px;
  bottom: 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(20, 24, 27, 0.65);
  border: 1px solid rgba(241, 236, 227, 0.18);
  color: var(--steam-100);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  backdrop-filter: blur(8px);
  transition: transform 260ms var(--ease-spring), background 260ms var(--ease-spring), border-color 260ms var(--ease-spring);
}

.map-cta .icon { width: 14px; height: 14px; }

.location-map:hover .map-cta {
  transform: translateY(-2px);
  background: var(--ember-500);
  border-color: transparent;
}

/* ============ BOOKING ============ */

.booking {
  padding: 96px 0;
  background: var(--steam-50);
}

.booking-inner {
  max-width: 620px;
  margin-inline: auto;
  padding-inline: 24px;
  text-align: left;
}

.booking-inner h2 {
  font-size: clamp(2rem, 4vw, 2.6rem);
  margin-bottom: 16px;
}

.booking-inner > p {
  color: var(--ink-700);
  margin-bottom: 40px;
  max-width: 48ch;
}

.booking-form {
  display: grid;
  gap: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field label {
  font-size: 0.82rem;
  color: var(--stone-500);
}

.field input {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(20, 24, 27, 0.15);
  background: var(--steam-100);
  color: var(--ink-900);
  transition: border-color 220ms var(--ease-spring);
}

.field input:focus {
  outline: none;
  border-color: var(--ember-500);
}

.booking-form .btn { justify-self: start; margin-top: 8px; }

.booking-confirm {
  margin-top: 20px;
  font-size: 0.92rem;
  color: var(--water-700);
  min-height: 1.4em;
}

/* ============ FOOTER ============ */

.site-footer {
  background: var(--ink-900);
  color: var(--stone-300);
  padding: 48px 0;
}

.footer-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.wordmark--footer { color: var(--steam-100); }

.footer-nav {
  display: flex;
  gap: 24px;
  font-size: 0.88rem;
}

.footer-nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 220ms var(--ease-spring), transform 220ms var(--ease-spring);
}

.footer-nav a:hover { color: var(--ember-500); transform: translateY(-1px); }

.footer-note {
  width: 100%;
  font-size: 0.76rem;
  color: var(--stone-500);
  margin-top: 12px;
}

@media (min-width: 700px) {
  .footer-note { width: auto; margin-top: 0; }
}

/* ============ SCROLL REVEAL ============ */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 700ms var(--ease-spring), transform 700ms var(--ease-spring);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .steam-wisp { animation: none; opacity: 0.15; }
  html { scroll-behavior: auto; }
}