/* =================================================
   XiKe Sleep · Privacy site
   Design: Refined Nocturnal Serenity
   Palette: ink #0A1929 · linen #F5F2E8 · gold #C9A876 · fog #2A3A52
   ================================================= */

:root {
  --ink:        #0A1929;
  --ink-2:      #0F2235;
  --ink-3:      #18324A;
  --fog:        #2A3A52;
  --linen:      #F5F2E8;
  --linen-mute: #D9D3C2;
  --gold:       #C9A876;
  --gold-mute:  #8A7553;
  --line:       rgba(245, 242, 232, 0.08);
  --line-2:     rgba(245, 242, 232, 0.18);

  --font-display: 'Fraunces', 'Noto Serif SC', Georgia, serif;
  --font-body:    'IBM Plex Sans', 'Noto Serif SC', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  --content-max: 1240px;
  --content-pad: clamp(20px, 5vw, 64px);
}

/* CN switches to serif body */
html[data-lang="zh"] {
  --font-body: 'Noto Serif SC', 'IBM Plex Sans', system-ui, sans-serif;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
img, svg { display: block; max-width: 100%; }
button { cursor: pointer; font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; text-decoration: none; }

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--linen);
  background: var(--ink);
  background-image:
    radial-gradient(ellipse at top, rgba(201, 168, 118, 0.05) 0%, transparent 60%),
    radial-gradient(ellipse at bottom right, rgba(24, 50, 74, 0.6) 0%, transparent 50%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* ============= Grain + Stars ============= */
.grain {
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 100;
  opacity: 0.08;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}

.stars {
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 0;
}
.stars span {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: 2px; height: 2px;
  background: var(--linen);
  border-radius: 50%;
  opacity: 0.55;
  box-shadow: 0 0 6px rgba(245, 242, 232, 0.4);
  animation: twinkle 4.5s var(--d, 0s) infinite ease-in-out;
}
@keyframes twinkle {
  0%, 100% { opacity: 0.15; transform: scale(0.6); }
  50%      { opacity: 0.85; transform: scale(1.05); }
}

/* ============= Top nav ============= */
.topnav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: clamp(20px, 4vw, 48px);
  padding: 22px var(--content-pad);
  background: rgba(10, 25, 41, 0.72);
  backdrop-filter: blur(20px) saturate(120%);
  -webkit-backdrop-filter: blur(20px) saturate(120%);
  border-bottom: 1px solid var(--line);
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--gold);
}
.moon-icon { width: 24px; height: 24px; }
.logo-text {
  font-family: var(--font-display);
  font-weight: 500;
  font-style: italic;
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--linen);
}
.nav-links {
  display: flex;
  gap: clamp(16px, 2.4vw, 36px);
  margin-left: auto;
  font-size: 14px;
  color: var(--linen-mute);
}
.nav-links a {
  position: relative;
  padding: 6px 2px;
  transition: color 0.25s;
}
.nav-links a:hover { color: var(--gold); }
.nav-links a::after {
  content: ""; position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.nav-links a:hover::after { transform: scaleX(1); }

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
  color: var(--linen-mute);
  transition: border-color 0.25s, background 0.25s;
}
.lang-toggle:hover { border-color: var(--gold); background: rgba(201, 168, 118, 0.08); }
.lang-opt { transition: color 0.2s, font-weight 0.2s; }
.lang-opt[data-active] { color: var(--gold); font-weight: 600; }
.lang-sep { color: var(--fog); }

/* ============= Hero ============= */
.hero {
  position: relative;
  padding: clamp(80px, 12vw, 140px) var(--content-pad) clamp(60px, 10vw, 120px);
  max-width: var(--content-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 64px);
  align-items: center;
}
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; }
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--linen-mute);
  width: fit-content;
}
.hero-tag .dot {
  width: 6px; height: 6px;
  background: var(--gold);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--gold);
  animation: pulse 2.5s infinite ease-in-out;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-style: normal;
  font-size: clamp(48px, 8.5vw, 112px);
  line-height: 0.96;
  letter-spacing: -0.025em;
  margin: 22px 0 26px;
  color: var(--linen);
  font-variation-settings: "opsz" 144, "SOFT" 50;
}
.hero-line-1, .hero-line-2 {
  display: block;
}
.hero-line-2 em {
  font-style: italic;
  color: var(--gold);
  font-variation-settings: "opsz" 144, "SOFT" 100;
}

.hero-sub {
  font-size: clamp(17px, 1.4vw, 20px);
  line-height: 1.55;
  color: var(--linen-mute);
  max-width: 560px;
  margin: 0 0 36px;
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: transform 0.2s, background 0.25s, border-color 0.25s, color 0.25s;
}
.btn-primary {
  background: var(--linen);
  color: var(--ink);
}
.btn-primary:hover {
  background: var(--gold);
  transform: translateY(-1px);
}
.btn-ghost {
  border: 1px solid var(--line-2);
  color: var(--linen);
}
.btn-ghost:hover {
  border-color: var(--gold);
  color: var(--gold);
}

/* ============= Moon stage ============= */
.moon-stage {
  position: relative;
  aspect-ratio: 1;
  max-width: 420px;
  margin: 0 auto;
  width: 100%;
}
.moon-orbit {
  position: absolute;
  inset: 12%;
  display: grid;
  place-items: center;
  animation: orbit-rotate 90s linear infinite;
}
@keyframes orbit-rotate {
  to { transform: rotate(360deg); }
}
.moon-glow {
  position: absolute;
  inset: -20%;
  background: radial-gradient(circle, rgba(245, 242, 232, 0.22) 0%, transparent 60%);
  filter: blur(20px);
  z-index: 0;
}
.moon-disc {
  position: relative;
  width: 100%; height: 100%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 32% 30%, #F5F2E8 0%, #E5DFC6 35%, #B8AC8A 80%, #837955 100%);
  box-shadow:
    inset -10px -20px 50px rgba(20, 30, 50, 0.4),
    0 0 60px rgba(245, 242, 232, 0.15);
  z-index: 1;
}
.moon-crater {
  position: absolute;
  top: var(--top);
  left: var(--left);
  width: var(--size);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(60, 50, 30, 0.4), rgba(60, 50, 30, 0));
}
.orbit-ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  color: var(--linen-mute);
  opacity: 0.18;
  animation: orbit-spin 200s linear infinite;
}
@keyframes orbit-spin {
  to { transform: rotate(-360deg); }
}

/* ============= Marquee ============= */
.marquee {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
  padding: 26px 0;
}
.marquee-track {
  display: flex;
  gap: 36px;
  white-space: nowrap;
  animation: scroll 35s linear infinite;
  font-family: var(--font-display);
  font-weight: 300;
  font-style: italic;
  font-size: clamp(22px, 3vw, 38px);
  color: var(--gold);
  font-variation-settings: "opsz" 144, "SOFT" 100;
}
.marquee-track span:nth-child(even) { color: var(--fog); }
@keyframes scroll {
  to { transform: translateX(-50%); }
}

/* ============= Section common ============= */
.section-head {
  max-width: 880px;
  margin: 0 auto clamp(40px, 6vw, 72px);
  padding: 0 var(--content-pad);
  text-align: center;
}
.section-number {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--gold);
  padding: 4px 12px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  margin-bottom: 24px;
}
.section-head h2 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 5vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  color: var(--linen);
  font-variation-settings: "opsz" 144, "SOFT" 40;
}
.section-head h2 em {
  font-style: italic;
  color: var(--gold);
  font-variation-settings: "opsz" 144, "SOFT" 100;
}
.section-sub {
  font-size: 17px;
  color: var(--linen-mute);
  line-height: 1.55;
  margin: 0;
}
.section-sub code {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--gold-mute);
  background: rgba(201, 168, 118, 0.08);
  padding: 2px 8px;
  border-radius: 4px;
}
.section-sub .sep {
  margin: 0 8px;
  color: var(--fog);
}

/* ============= Features ============= */
.features {
  padding: clamp(80px, 10vw, 140px) 0 clamp(60px, 8vw, 100px);
  max-width: var(--content-max);
  margin: 0 auto;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px;
  background: var(--line-2);
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
  margin: 0 var(--content-pad);
}

.feature {
  background: var(--ink);
  padding: clamp(28px, 3.5vw, 44px);
  position: relative;
  transition: background 0.4s;
}
.feature:hover {
  background: var(--ink-2);
}
.feature-icon {
  color: var(--gold);
  width: 44px; height: 44px;
  margin-bottom: 28px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  transition: border-color 0.3s;
}
.feature-icon svg { width: 26px; height: 26px; }
.feature:hover .feature-icon { border-color: var(--gold); }
.feature h3 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 21px;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  color: var(--linen);
}
.feature p {
  font-size: 15px;
  line-height: 1.62;
  color: var(--linen-mute);
  margin: 0;
}

/* ============= Promise ============= */
.promise {
  padding: clamp(80px, 10vw, 140px) var(--content-pad);
  max-width: var(--content-max);
  margin: 0 auto;
}
.promise-inner {
  text-align: center;
  max-width: 920px;
  margin: 0 auto;
}
.promise-inner h2 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(40px, 6.5vw, 78px);
  line-height: 1;
  letter-spacing: -0.025em;
  margin: 20px 0 50px;
  color: var(--linen);
  font-variation-settings: "opsz" 144, "SOFT" 40;
}
.promise-card {
  position: relative;
  padding: clamp(40px, 5vw, 72px) clamp(28px, 4vw, 56px);
  background:
    linear-gradient(160deg, rgba(245, 242, 232, 0.03) 0%, rgba(201, 168, 118, 0.04) 100%),
    var(--ink-2);
  border: 1px solid var(--line-2);
  border-radius: 4px;
  text-align: left;
  overflow: hidden;
}
.promise-card::before {
  content: ""; position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.promise-quote {
  display: flex;
  gap: 18px;
  margin-bottom: 44px;
}
.quote-mark {
  font-family: var(--font-display);
  font-size: 80px;
  line-height: 0.5;
  color: var(--gold);
  margin-top: 18px;
  font-variation-settings: "opsz" 144, "SOFT" 100;
}
.quote-body {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--linen);
  margin: 0;
  font-variation-settings: "opsz" 144, "SOFT" 60;
}

.promise-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line-2);
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
  margin: 0 -clamp(28px, 4vw, 56px) 32px;
}
@media (max-width: 640px) {
  .promise-grid { grid-template-columns: repeat(2, 1fr); }
}
.promise-cell {
  text-align: center;
  padding: clamp(24px, 3vw, 36px) 16px;
  background: var(--ink-2);
}
.promise-num {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(56px, 7vw, 88px);
  line-height: 1;
  color: var(--gold);
  font-variation-settings: "opsz" 144, "SOFT" 30;
}
.promise-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--linen-mute);
  margin-top: 6px;
}

.promise-footnote {
  font-size: 14px;
  color: var(--linen-mute);
  line-height: 1.55;
  font-style: italic;
  margin: 0;
  text-align: center;
}

/* ============= Policy ============= */
.policy {
  padding: clamp(80px, 10vw, 140px) 0 clamp(80px, 10vw, 140px);
  max-width: var(--content-max);
  margin: 0 auto;
}

.policy-list {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 var(--content-pad);
  list-style: none;
  counter-reset: policy;
}
.policy-list li {
  position: relative;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}
.policy-list li:last-child { border-bottom: 0; }
.policy-list h3 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 21px;
  line-height: 1.3;
  letter-spacing: -0.005em;
  margin: 0 0 12px;
  color: var(--linen);
}
.policy-list p {
  font-size: 15px;
  line-height: 1.68;
  color: var(--linen-mute);
  margin: 0;
}
.policy-list p a {
  color: var(--gold);
  border-bottom: 1px dashed var(--gold-mute);
  padding-bottom: 1px;
  transition: border-color 0.2s;
}
.policy-list p a:hover { border-color: var(--gold); }

/* ============= Footer ============= */
.site-foot {
  background: var(--ink-2);
  border-top: 1px solid var(--line);
  padding: clamp(60px, 8vw, 100px) var(--content-pad) 30px;
}
.foot-grid {
  max-width: var(--content-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: clamp(24px, 3vw, 48px);
  padding-bottom: 50px;
  border-bottom: 1px solid var(--line);
}
@media (max-width: 760px) {
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 460px) {
  .foot-grid { grid-template-columns: 1fr; }
}

.foot-block h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 16px;
  font-weight: 500;
}
.foot-block a {
  display: block;
  font-size: 15px;
  color: var(--linen);
  margin-bottom: 8px;
  transition: color 0.25s;
}
.foot-block a:hover { color: var(--gold); }

.foot-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 18px;
  color: var(--linen);
}
.moon-icon-small { width: 18px; height: 18px; color: var(--gold); }
.foot-tag {
  font-size: 14px;
  color: var(--linen-mute);
  line-height: 1.55;
  margin: 0;
  font-style: italic;
  max-width: 320px;
}

.foot-bar {
  max-width: var(--content-max);
  margin: 0 auto;
  padding-top: 26px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--linen-mute);
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}
.foot-bar .sep { color: var(--fog); }

/* ============= Reveal animations ============= */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .stars span, .moon-orbit, .orbit-ring, .marquee-track { animation: none; }
}

/* ============= Mobile niceties ============= */
@media (max-width: 700px) {
  .nav-links { display: none; }
  .hero { padding-top: 60px; }
  .hero-title { font-size: clamp(44px, 14vw, 80px); }
  .moon-stage { max-width: 280px; }
}