/* Berth site — Nordic seaside: deep North Sea slate, fog whites,
   one frost-cyan harbor light. Derived from Nord (the app's built-in
   theme family), tuned for craft: no glows, layered shadows, hairlines
   that fade, a grain of texture. */

:root {
  --bg:      #1F252F;
  --bg-2:    #252D39;
  --panel:   #2A3340;
  --line:    rgba(216, 222, 233, 0.09);
  --line-2:  rgba(216, 222, 233, 0.16);
  --hi:      rgba(255, 255, 255, 0.045);  /* 表面顶部高光 */
  --fg:      #ECEFF4;
  --mut:     #9DA9BB;
  --dim:     #6F7C8F;
  --frost:   #88C0D0;
  --frost-2: #81A1C1;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Segoe UI", sans-serif;
  --mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background:
    radial-gradient(58% 44% at 72% 26%, rgba(136, 192, 208, 0.045), transparent 70%),
    linear-gradient(180deg, #232A35 0%, var(--bg) 46%, #1C222B 100%);
  background-color: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 颗粒:压平色带,给平面一点材质 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 2147483647;
  pointer-events: none;
  opacity: 0.05;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection { background: var(--frost); color: #16222A; }

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

h1 { line-height: 1.18; letter-spacing: -0.018em; }
h2, h3 { line-height: 1.18; letter-spacing: -0.018em; text-wrap: balance; }
:lang(zh-CN) h1, :lang(zh-CN) h2, :lang(zh-CN) h3 { letter-spacing: 0.005em; }

code, kbd { font-family: var(--mono); }

/* ---------- Shared ---------- */

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--frost-2);
  margin-bottom: 16px;
}

section { max-width: 1080px; margin: 0 auto; padding: 116px 24px 0; }

section h2 {
  font-size: clamp(25px, 3vw, 32px);
  font-weight: 700;
  margin-bottom: 44px;
  max-width: 640px;
}

.btn {
  display: inline-block;
  font-size: 15px;
  font-weight: 590;
  letter-spacing: 0.005em;
  padding: 11px 24px;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: linear-gradient(180deg, #95CBDA, var(--frost));
  color: #14202A;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.32), 0 2px 10px -4px rgba(0, 0, 0, 0.6);
}
.btn-primary:hover { background: linear-gradient(180deg, #A2D3E1, #90C7D6); }

.btn-ghost { border-color: var(--line-2); color: var(--fg); }
.btn-ghost:hover { background: rgba(236, 239, 244, 0.045); border-color: rgba(216, 222, 233, 0.26); }

/* ---------- Nav ---------- */

.nav {
  max-width: 1120px;
  margin: 0 auto;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; letter-spacing: -0.01em; }
.nav-links { display: flex; gap: 26px; margin-left: auto; font-size: 13.5px; color: var(--mut); }
.nav-links a { transition: color 0.15s ease; }
.nav-links a:hover { color: var(--fg); }
.nav-lang {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--mut);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 3px 9px;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.nav-lang:hover { color: var(--fg); border-color: var(--line-2); }
.nav-cta { padding: 7px 18px; font-size: 13.5px; }

/* ---------- 夜海(hero 背景) ---------- */

.cove { position: relative; overflow: hidden; }
.cove > .nav, .cove > .hero { position: relative; z-index: 1; }

.sea {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: min(42%, 380px);
  z-index: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent, rgba(14, 19, 27, 0.55));
}
/* 水面微澜:极淡的横向光带,渐隐入深 */
.sea::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    178deg,
    rgba(136, 192, 208, 0.035) 0 1px,
    transparent 1px 14px,
    rgba(129, 161, 193, 0.02) 14px 15px,
    transparent 15px 34px
  );
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 30%, rgba(0, 0, 0, 0.4));
  mask-image: linear-gradient(180deg, transparent, #000 30%, rgba(0, 0, 0, 0.4));
}

/* ---------- Hero ---------- */

.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 76px 24px 150px;
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: 56px;
  align-items: center;
}

/* 窗口放大并向右出血:锚在视口边上,而不是悬在版心里 */
.harbor .app-shot { width: 124%; max-width: none; }

.hero h1 {
  font-size: clamp(40px, 4.9vw, 58px);
  font-weight: 760;
  line-height: 1.08;
  letter-spacing: -0.028em;
  margin-bottom: 24px;
}
:lang(zh-CN) .hero h1 { font-size: clamp(35px, 4.3vw, 50px); line-height: 1.18; letter-spacing: 0; font-weight: 700; }

.cursor {
  display: inline-block;
  width: 0.48em;
  height: 0.92em;
  margin-left: 9px;
  vertical-align: baseline;
  transform: translateY(0.1em);
  background: var(--frost);
  animation: blink 1.2s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-sub { color: var(--mut); font-size: 16.5px; margin-bottom: 36px; max-width: 46ch; }

.hero-actions { display: flex; gap: 12px; margin-bottom: 22px; }

.hero-note { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.02em; color: var(--dim); }

/* ---------- App screenshots ---------- */

.harbor { position: relative; }

.app-shot {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow:
    0 0 0 1px rgba(216, 222, 233, 0.09),
    inset 0 1px 0 rgba(255, 255, 255, 0.06),
    0 2px 6px rgba(0, 0, 0, 0.3),
    0 24px 48px -16px rgba(0, 0, 0, 0.55),
    0 64px 120px -40px rgba(0, 0, 0, 0.5);
}
.harbor .app-shot { position: relative; z-index: 2; }

/* 灯光落水:碎成几缕,极淡 */
.reflection {
  position: absolute;
  top: calc(100% + 14px);
  left: 10%;
  right: 10%;
  height: 100px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 34px;
  pointer-events: none;
  filter: blur(2px);
  opacity: 0.6;
}
.reflection i {
  display: block;
  background: linear-gradient(180deg, rgba(136, 192, 208, 0.18), rgba(136, 192, 208, 0.03) 65%, transparent);
  -webkit-mask-image: repeating-linear-gradient(180deg, #000 0 4px, transparent 4px 9px);
  mask-image: repeating-linear-gradient(180deg, #000 0 4px, transparent 4px 9px);
  transform-origin: top;
  animation: shimmer 5s ease-in-out infinite;
}
.reflection i:nth-child(1) { width: 32%; height: 100%; }
.reflection i:nth-child(2) { width: 11%; height: 64%; animation-delay: 1.6s; }
.reflection i:nth-child(3) { width: 6%;  height: 40%; animation-delay: 3s; }
@keyframes shimmer {
  50% { transform: scaleY(0.84) translateX(3px); opacity: 0.7; }
}

/* 夜色顺入正文,避免 cove 边缘出现接缝 */
main { background: linear-gradient(180deg, rgba(14, 19, 27, 0.55), transparent 240px); }

/* ---------- Features ---------- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.card {
  background: linear-gradient(180deg, rgba(37, 45, 57, 0.72), rgba(37, 45, 57, 0.38));
  box-shadow: inset 0 1px 0 var(--hi), inset 0 0 0 1px rgba(216, 222, 233, 0.05);
  border-radius: 14px;
  padding: 26px 24px 24px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: inset 0 1px 0 var(--hi), inset 0 0 0 1px rgba(216, 222, 233, 0.09), 0 12px 32px -16px rgba(0, 0, 0, 0.5);
}
.card h3 { font-size: 16px; font-weight: 650; margin-bottom: 9px; }
.card p { font-size: 13.5px; line-height: 1.7; color: var(--mut); }
.card code {
  font-size: 12px;
  background: rgba(20, 25, 32, 0.6);
  box-shadow: inset 0 0 0 1px var(--line);
  border-radius: 5px;
  padding: 1px 6px;
}

/* ---------- Shortcuts ---------- */

.kbd-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 30px;
  font-size: 14px;
  color: var(--mut);
}
.kbd-strip kbd {
  display: inline-block;
  min-width: 44px;
  text-align: center;
  font-size: 12.5px;
  color: var(--fg);
  background: linear-gradient(180deg, #2E3745, #272F3B);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.07), 0 1.5px 0 rgba(0, 0, 0, 0.5);
  border-radius: 7px;
  padding: 4px 10px;
  margin-right: 9px;
}
.shortcuts-note { margin-top: 26px; font-size: 14px; color: var(--dim); }

/* ---------- Themes ---------- */

.themes-lede {
  font-size: 15px;
  color: var(--mut);
  margin: -30px 0 36px;
  max-width: 56ch;
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.theme-card {
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg-2);
  box-shadow: inset 0 0 0 1px rgba(216, 222, 233, 0.07);
}
.theme-swatch {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--tc-bg);
  color: var(--tc-fg);
  font-family: var(--mono);
  font-size: 12px;
  padding: 22px 16px;
  white-space: nowrap;
  overflow: hidden;
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.12);
}
.ts-prompt { color: var(--tc-ac); }
.ts-dots { display: flex; gap: 5px; margin-left: auto; }
.ts-dots i { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.theme-card figcaption {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 16px 16px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--dim);
}
.theme-card figcaption b { font-size: 13.5px; font-weight: 650; color: var(--fg); }

/* ---------- Security ---------- */

.security-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 36px;
  max-width: 880px;
}
.security-list li {
  position: relative;
  padding: 24px 2px 0;
  background: linear-gradient(90deg, var(--line-2), transparent 85%) top / 100% 1px no-repeat;
}
.security-list li::before {
  content: "";
  position: absolute;
  top: -0.5px;
  left: 0;
  width: 28px;
  height: 2px;
  background: var(--frost);
}
.security-list h3 { font-size: 16px; font-weight: 650; margin-bottom: 10px; }
.security-list p { font-size: 13.5px; line-height: 1.7; color: var(--mut); }

/* ---------- FAQ ---------- */

.faq-list { max-width: 720px; }
.faq-list > div {
  padding: 26px 0;
  background: linear-gradient(90deg, var(--line), transparent 92%) bottom / 100% 1px no-repeat;
}
.faq-list dt { font-weight: 650; font-size: 16px; margin-bottom: 8px; }
.faq-list dd { color: var(--mut); font-size: 14px; line-height: 1.75; }

/* ---------- Footer ---------- */

.footer {
  max-width: 1080px;
  margin: 120px auto 0;
  padding: 42px 24px 60px;
  background: linear-gradient(90deg, transparent, var(--line) 18%, var(--line) 82%, transparent) top / 100% 1px no-repeat;
  display: grid;
  gap: 10px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.footer-links { display: flex; gap: 20px; font-size: 13px; color: var(--mut); }
.footer-links a:hover { color: var(--fg); }
.footer-fine { font-size: 12px; color: var(--dim); }

/* ---------- Focus ---------- */

a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--frost);
  outline-offset: 2px;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding: 44px 24px 130px; gap: 52px; }
  .harbor .app-shot { width: 100%; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .theme-grid { grid-template-columns: 1fr 1fr; }
  .security-list { grid-template-columns: 1fr; gap: 28px; }
  .nav-links { display: none; }
}

@media (max-width: 600px) {
  section { padding-top: 84px; }
  .feature-grid, .theme-grid { grid-template-columns: 1fr; }
  .hero { padding-bottom: 116px; }
  .hero-actions { flex-direction: column; }
  .btn { text-align: center; }
  .reflection { gap: 22px; }
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cursor, .reflection i { animation: none; }
  * { transition: none !important; }
}