/* =========================================================================
   mmeett.si — 极简 AI 展示页
   ========================================================================= */

/* ---------- 1. Tokens ---------- */
:root {
  --bg: #04050a;
  --bg-soft: #070912;
  --bg-alt: #06070f;

  --text: #e9edf6;
  --text-dim: rgba(233, 237, 246, 0.62);
  --text-mute: rgba(233, 237, 246, 0.42);

  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);
  --surface: rgba(255, 255, 255, 0.028);
  --surface-hover: rgba(255, 255, 255, 0.055);

  --c-1: #7dd3fc;
  --c-2: #818cf8;
  --c-3: #c084fc;
  --grad: linear-gradient(108deg, #7dd3fc 0%, #818cf8 46%, #c084fc 100%);
  --grad-soft: linear-gradient(108deg, rgba(125, 211, 252, 0.16), rgba(192, 132, 252, 0.16));

  --radius: 18px;
  --radius-lg: 26px;
  --container: 1180px;
  --nav-h: 72px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", "Cascadia Mono", Consolas, monospace;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.42;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.35'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }

::selection { background: rgba(129, 140, 248, 0.36); color: #fff; }

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: #05060c; }
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 20px;
  border: 2px solid #05060c;
}
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.22); }

:focus-visible {
  outline: 2px solid var(--c-1);
  outline-offset: 3px;
  border-radius: 6px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 20px;
  z-index: 10000;
  padding: 10px 18px;
  border-radius: 10px;
  background: #fff;
  color: #06070f;
  font-weight: 600;
  transition: top 0.25s var(--ease);
}
.skip-link:focus { top: 16px; }

/* ---------- 3. Utilities ---------- */
.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.i {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform 0.35s var(--ease);
}

.br-lg, .br-sm { display: none; }

/* Reveal on scroll */
.js .reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
  will-change: opacity, transform;
}
.js .reveal.is-in {
  opacity: 1;
  transform: none;
}
.js .reveal[data-delay="1"] { transition-delay: 0.08s; }
.js .reveal[data-delay="2"] { transition-delay: 0.16s; }
.js .reveal[data-delay="3"] { transition-delay: 0.24s; }
.js .reveal[data-delay="4"] { transition-delay: 0.32s; }
.js .reveal[data-delay="5"] { transition-delay: 0.40s; }
.js .reveal[data-delay="6"] { transition-delay: 0.48s; }

/* ---------- 4. Progress bar ---------- */
.progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 900;
  pointer-events: none;
}
.progress span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--grad);
  box-shadow: 0 0 12px rgba(129, 140, 248, 0.8);
}

/* ---------- 5. Nav ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 800;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: background 0.4s var(--ease), backdrop-filter 0.4s var(--ease),
    border-color 0.4s var(--ease), height 0.4s var(--ease);
}

.nav.is-stuck {
  height: 62px;
  background: rgba(4, 5, 10, 0.72);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  border-bottom-color: var(--line);
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 650;
  letter-spacing: -0.015em;
  margin-right: auto;
}

.brand__mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  border: 1px solid var(--line-strong);
  background: linear-gradient(150deg, rgba(125, 211, 252, 0.14), rgba(192, 132, 252, 0.1));
  color: #cfe4ff;
}
.brand__mark svg { width: 19px; height: 19px; }
.brand__mark--sm { width: 28px; height: 28px; border-radius: 8px; }
.brand__mark--sm svg { width: 15px; height: 15px; }

.brand__text { font-size: 1.02rem; }
.brand__text i {
  font-style: normal;
  color: var(--text-mute);
  font-weight: 500;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav__links a {
  position: relative;
  padding: 8px 14px;
  font-size: 0.9rem;
  color: var(--text-dim);
  border-radius: 9px;
  transition: color 0.3s var(--ease), background 0.3s var(--ease);
}
.nav__links a:hover { color: var(--text); background: rgba(255, 255, 255, 0.05); }
.nav__links a.is-active { color: var(--text); }
.nav__links a.is-active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 1px;
  background: var(--grad);
}

.nav__toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  position: relative;
}
.nav__toggle span {
  position: absolute;
  left: 12px;
  width: 18px;
  height: 1.6px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.4s var(--ease);
}
.nav__toggle span:nth-child(1) { top: 17px; }
.nav__toggle span:nth-child(2) { top: 23px; }
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(3px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { transform: translateY(-3px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 790;
  background: rgba(4, 5, 10, 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--nav-h) + 20px) 32px 40px;
  opacity: 0;
  transition: opacity 0.4s var(--ease);
}
.mobile-menu.is-open { opacity: 1; }
.mobile-menu[hidden] { display: none; }
.mobile-menu nav { display: flex; flex-direction: column; }
.mobile-menu nav a {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 16px 4px;
  font-size: 1.9rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  border-bottom: 1px solid var(--line);
  color: var(--text);
}
.mobile-menu nav a span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-1);
  letter-spacing: 0.08em;
}
.mobile-menu__foot {
  margin-top: 40px;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-mute);
}

/* ---------- 6. Buttons ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.92rem;
  font-weight: 550;
  letter-spacing: 0.005em;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.35s var(--ease), background 0.35s var(--ease),
    border-color 0.35s var(--ease), box-shadow 0.35s var(--ease), color 0.3s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn:hover .i { transform: translateX(3px); }

.btn--primary {
  color: #06070f;
  background: linear-gradient(108deg, #a5e0ff, #b9bcff 48%, #dcb6ff);
  box-shadow: 0 10px 30px -12px rgba(129, 140, 248, 0.7);
  font-weight: 620;
}
.btn--primary:hover { box-shadow: 0 18px 44px -14px rgba(129, 140, 248, 0.85); }

.btn--ghost {
  color: var(--text);
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.035);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.085);
  border-color: rgba(255, 255, 255, 0.28);
}

.btn--lg { padding: 15px 30px; font-size: 1rem; }

/* ---------- 7. Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 72px) 0 120px;
  overflow: hidden;
  isolation: isolate;
}

.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  opacity: 0.85;
}

.hero__grid {
  position: absolute;
  inset: -10%;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 10%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 10%, transparent 78%);
  animation: gridDrift 26s linear infinite;
}

@keyframes gridDrift {
  from { transform: translate3d(0, 0, 0); }
  to { transform: translate3d(68px, 68px, 0); }
}

.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  z-index: 0;
  pointer-events: none;
}
.hero__glow--a {
  width: 46vw; height: 46vw;
  min-width: 340px; min-height: 340px;
  top: -14%; left: -8%;
  background: radial-gradient(circle, rgba(56, 130, 246, 0.32), transparent 66%);
  animation: float1 20s ease-in-out infinite;
}
.hero__glow--b {
  width: 40vw; height: 40vw;
  min-width: 300px; min-height: 300px;
  bottom: -18%; right: -6%;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.28), transparent 66%);
  animation: float2 24s ease-in-out infinite;
}
.hero__glow--c {
  width: 30vw; height: 30vw;
  min-width: 220px; min-height: 220px;
  top: 34%; left: 44%;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.16), transparent 68%);
  animation: float1 28s ease-in-out infinite reverse;
}

@keyframes float1 {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(4%, -5%, 0) scale(1.1); }
}
@keyframes float2 {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(-5%, 4%, 0) scale(1.12); }
}

.hero__inner { position: relative; z-index: 2; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.eyebrow__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-1);
  animation: ping 2.4s var(--ease-out) infinite;
}
@keyframes ping {
  0% { box-shadow: 0 0 0 0 rgba(125, 211, 252, 0.55); }
  70% { box-shadow: 0 0 0 9px rgba(125, 211, 252, 0); }
  100% { box-shadow: 0 0 0 0 rgba(125, 211, 252, 0); }
}

.hero__title {
  margin: 26px 0 0;
  font-size: clamp(2.9rem, 8vw, 6rem);
  line-height: 1.03;
  font-weight: 680;
  letter-spacing: -0.038em;
  max-width: 16ch;
}

.hero__lead {
  margin-top: 28px;
  max-width: 620px;
  font-size: clamp(1rem, 1.35vw, 1.12rem);
  color: var(--text-dim);
  line-height: 1.8;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 40px;
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  margin-top: clamp(56px, 8vw, 92px);
  padding-top: 30px;
  border-top: 1px solid var(--line);
  max-width: 880px;
}
.hero__stats li { display: flex; flex-direction: column; gap: 4px; }
.hero__stats strong {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  font-weight: 620;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__stats span {
  font-size: 0.8rem;
  color: var(--text-mute);
  letter-spacing: 0.02em;
}

.hero__scroll {
  position: absolute;
  left: 50%;
  bottom: 34px;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.26em;
  color: var(--text-mute);
  transition: color 0.3s var(--ease);
}
.hero__scroll:hover { color: var(--text); }
.hero__scroll-line {
  width: 1px;
  height: 46px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(to bottom, transparent, rgba(255, 255, 255, 0.4), transparent);
}
.hero__scroll-line::after {
  content: "";
  position: absolute;
  left: 0;
  width: 1px;
  height: 46px;
  background: linear-gradient(to bottom, transparent, var(--c-1));
  animation: scrollLine 2.4s var(--ease) infinite;
}
@keyframes scrollLine {
  0% { top: -46px; }
  60%, 100% { top: 46px; }
}

/* ---------- 8. Marquee ---------- */
.marquee {
  position: relative;
  padding: 26px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
  overflow: hidden;
  mask-image: linear-gradient(to right, transparent, #000 12%, #000 88%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, #000 12%, #000 88%, transparent);
}
.marquee__track {
  display: flex;
  width: max-content;
  animation: marquee 42s linear infinite;
}
.marquee__row {
  display: flex;
  align-items: center;
  gap: 34px;
  padding-right: 34px;
}
.marquee__row span {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(233, 237, 246, 0.5);
  white-space: nowrap;
}
.marquee__row i {
  font-style: normal;
  font-size: 0.5rem;
  color: rgba(129, 140, 248, 0.75);
}
@keyframes marquee {
  from { transform: translate3d(0, 0, 0); }
  to { transform: translate3d(-50%, 0, 0); }
}

/* ---------- 9. Sections ---------- */
.section {
  position: relative;
  padding: clamp(96px, 12vw, 158px) 0;
}
.section--alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section__head { max-width: 820px; margin-bottom: clamp(48px, 6vw, 72px); }

.section__title {
  margin-top: 20px;
  font-size: clamp(2rem, 4.4vw, 3.3rem);
  line-height: 1.14;
  font-weight: 660;
  letter-spacing: -0.032em;
}

.section__lead {
  margin-top: 20px;
  max-width: 560px;
  color: var(--text-dim);
  font-size: 1.02rem;
}

/* ---------- 10. Capability cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
}

.card {
  position: relative;
  padding: 30px 26px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow: hidden;
  transition: transform 0.5s var(--ease), border-color 0.5s var(--ease),
    background 0.5s var(--ease);
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.5s var(--ease);
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 0%),
    rgba(129, 140, 248, 0.14), transparent 62%);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-5px);
  border-color: var(--line-strong);
  background: var(--surface-hover);
}
.card:hover::before { opacity: 1; }

.card__icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  border: 1px solid var(--line-strong);
  background: var(--grad-soft);
  color: #cfe0ff;
  margin-bottom: 22px;
  transition: transform 0.5s var(--ease);
}
.card:hover .card__icon { transform: translateY(-2px) scale(1.05); }
.card__icon svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card__title {
  font-size: 1.16rem;
  font-weight: 620;
  letter-spacing: -0.018em;
}
.card__text {
  margin-top: 10px;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 22px;
}
.card__tags li {
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-mute);
}

/* ---------- 11. Bento tiles ---------- */
.bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.tile {
  position: relative;
  padding: 30px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.012));
  overflow: hidden;
  transition: transform 0.5s var(--ease), border-color 0.5s var(--ease);
}
.tile--wide { grid-column: span 2; }

.tile::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(125, 211, 252, 0.6), transparent);
  opacity: 0;
  transition: opacity 0.5s var(--ease);
}
.tile:hover { transform: translateY(-4px); border-color: var(--line-strong); }
.tile:hover::after { opacity: 1; }

.tile__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--c-1);
  margin-bottom: 42px;
}
.tile h3 {
  font-size: 1.14rem;
  font-weight: 620;
  letter-spacing: -0.018em;
}
.tile p {
  margin-top: 10px;
  font-size: 0.91rem;
  line-height: 1.75;
  color: var(--text-dim);
  max-width: 46ch;
}

/* ---------- 12. About ---------- */
.about {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: clamp(40px, 6vw, 88px);
  align-items: start;
}

.about__left p {
  margin-top: 22px;
  color: var(--text-dim);
  font-size: 1rem;
  max-width: 56ch;
}
.about__left .section__title { margin-top: 18px; }

.about__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 34px;
}
.about__chips span {
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.03);
  font-size: 0.84rem;
  color: var(--text-dim);
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.about__chips span:hover {
  color: var(--text);
  border-color: rgba(125, 211, 252, 0.5);
  background: rgba(125, 211, 252, 0.08);
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.012));
  padding: 8px 24px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.panel__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.panel__row:last-child { border-bottom: 0; }
.panel__key {
  flex: none;
  font-size: 0.83rem;
  color: var(--text-mute);
  letter-spacing: 0.04em;
}
.panel__val {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text);
  text-align: right;
}
.panel__val--ok { display: inline-flex; align-items: center; gap: 8px; }
.panel__val--ok i {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 10px rgba(74, 222, 128, 0.9);
}

/* ---------- 13. Contact ---------- */
.section--contact {
  position: relative;
  overflow: hidden;
  text-align: center;
}
.contact__glow {
  position: absolute;
  left: 50%;
  top: 12%;
  width: min(900px, 110vw);
  height: 480px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, rgba(129, 140, 248, 0.22), transparent 68%);
  filter: blur(70px);
  pointer-events: none;
}
.contact {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.contact__title {
  margin-top: 22px;
  font-size: clamp(2.1rem, 5.2vw, 3.9rem);
  line-height: 1.12;
  font-weight: 660;
  letter-spacing: -0.035em;
}
.contact__lead {
  margin-top: 22px;
  max-width: 520px;
  color: var(--text-dim);
}
.contact__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 40px;
}

/* ---------- 14. Footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 44px 0;
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  letter-spacing: -0.015em;
}
.footer__note, .footer__copy {
  font-size: 0.82rem;
  color: var(--text-mute);
}

/* ---------- 15. To top & toast ---------- */
.to-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 700;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: rgba(10, 12, 22, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--text);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease),
    visibility 0.4s, background 0.3s var(--ease);
}
.to-top.is-on { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: rgba(255, 255, 255, 0.1); }
.to-top svg {
  width: 17px; height: 17px;
  fill: none; stroke: currentColor; stroke-width: 1.6;
  stroke-linecap: round; stroke-linejoin: round;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  z-index: 950;
  transform: translate(-50%, 18px);
  padding: 11px 20px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(12, 14, 24, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-size: 0.85rem;
  color: var(--text);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease), visibility 0.35s;
}
.toast.is-on { opacity: 1; visibility: visible; transform: translate(-50%, 0); }

/* ---------- 16. Responsive ---------- */
@media (max-width: 1024px) {
  .bento { grid-template-columns: repeat(2, 1fr); }
  .tile--wide { grid-column: span 2; }
  .about { grid-template-columns: 1fr; }
}

@media (min-width: 861px) {
  .br-lg { display: inline; }
}

@media (max-width: 860px) {
  .container { padding: 0 22px; }
  .nav__links, .nav__cta { display: none; }
  .nav__toggle { display: block; }
  .hero { min-height: auto; padding: calc(var(--nav-h) + 64px) 0 96px; }
  .hero__title { max-width: 100%; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .hero__scroll { display: none; }
  .br-sm { display: inline; }
  .footer__inner { flex-direction: column; align-items: flex-start; gap: 14px; }
}

@media (max-width: 680px) {
  .bento { grid-template-columns: 1fr; }
  .tile--wide { grid-column: span 1; }
  .tile__num { margin-bottom: 26px; }
  .hero__actions .btn { width: 100%; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .contact__actions { flex-direction: column; align-items: stretch; width: 100%; }
  .panel { padding: 4px 18px; }
  .panel__row { flex-direction: column; align-items: flex-start; gap: 6px; }
  .panel__val { text-align: left; }
  .to-top { right: 16px; bottom: 16px; }
}

/* ---------- 17. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .js .reveal { opacity: 1; transform: none; }
  .hero__canvas { display: none; }
}

@media print {
  .nav, .to-top, .progress, .marquee, .hero__canvas, .hero__glow, .hero__grid {
    display: none !important;
  }
  body { background: #fff; color: #000; }
}

/* =========================================================================
   18. 域名出售页组件
   ========================================================================= */

/* ---------- 语言切换 ---------- */
.lang {
  flex: none;
  height: 34px;
  min-width: 52px;
  padding: 0 13px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-dim);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease),
    background 0.3s var(--ease), transform 0.3s var(--ease);
}
.lang:hover {
  color: var(--text);
  border-color: rgba(125, 211, 252, 0.5);
  background: rgba(125, 211, 252, 0.09);
  transform: translateY(-1px);
}

/* ---------- 首屏域名 ---------- */
.sale__domain {
  margin: 24px 0 0;
  font-size: clamp(3.1rem, 11.5vw, 8.2rem);
  line-height: 0.98;
  font-weight: 700;
  letter-spacing: -0.048em;
  word-break: break-word;
}

.sale__tagline {
  margin-top: 24px;
  font-size: clamp(1.02rem, 1.7vw, 1.32rem);
  font-weight: 520;
  letter-spacing: -0.012em;
  color: var(--text);
}

.about__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

/* ---------- 交易流程 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.step {
  position: relative;
  padding: 30px 26px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  transition: transform 0.5s var(--ease), border-color 0.5s var(--ease),
    background 0.5s var(--ease);
}
.step:hover {
  transform: translateY(-5px);
  border-color: var(--line-strong);
  background: var(--surface-hover);
}

.step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--c-1);
  margin-bottom: 40px;
}
.step h3 {
  font-size: 1.1rem;
  font-weight: 620;
  letter-spacing: -0.018em;
}
.step p {
  margin-top: 10px;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text-dim);
}

/* 步骤之间的连线箭头 */
.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 54px;
  right: -13px;
  width: 8px;
  height: 8px;
  border-top: 1px solid var(--line-strong);
  border-right: 1px solid var(--line-strong);
  transform: rotate(45deg);
  z-index: 2;
}

/* ---------- FAQ ---------- */
.faq {
  border-top: 1px solid var(--line);
}
.faq__item {
  border-bottom: 1px solid var(--line);
}
.faq__item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 25px 4px;
  font-size: clamp(1rem, 1.6vw, 1.16rem);
  font-weight: 550;
  letter-spacing: -0.015em;
  cursor: pointer;
  list-style: none;
  transition: color 0.3s var(--ease);
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
  content: "";
  flex: none;
  width: 10px;
  height: 10px;
  border-right: 1.5px solid var(--text-mute);
  border-bottom: 1.5px solid var(--text-mute);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 0.4s var(--ease), border-color 0.3s var(--ease);
}
.faq__item summary:hover { color: #fff; }
.faq__item[open] summary::after {
  transform: rotate(225deg) translate(-2px, -2px);
  border-color: var(--c-1);
}
.faq__item p {
  padding: 0 64px 28px 4px;
  max-width: 82ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-dim);
  animation: faqIn 0.42s var(--ease);
}
@keyframes faqIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 报价表单 ---------- */
.offer {
  width: 100%;
  max-width: 780px;
  margin-top: 46px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.014));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  text-align: left;
}

.offer__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.field__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-mute);
}
.field__input {
  width: 100%;
  padding: 12px 15px;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  font: inherit;
  font-size: 0.95rem;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease),
    box-shadow 0.3s var(--ease);
}
.field__input::placeholder { color: rgba(233, 237, 246, 0.3); }
.field__input:focus {
  outline: none;
  border-color: rgba(125, 211, 252, 0.6);
  background: rgba(125, 211, 252, 0.06);
  box-shadow: 0 0 0 4px rgba(125, 211, 252, 0.1);
}
.field__input--area {
  resize: vertical;
  min-height: 96px;
  line-height: 1.7;
}

.offer__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}
.offer__hint {
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--text-mute);
}

/* ---------- 联系方式（邮箱 + 微信） ---------- */
.contact__links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-top: 40px;
  width: 100%;
}

.contact__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  max-width: 440px;
  padding: 13px 13px 13px 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  transition: border-color 0.35s var(--ease), background 0.35s var(--ease);
}
.contact__link:hover {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.055);
}

.contact__link-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
}

/* 联系方式高亮：更大的字号 + 主题渐变色 + 外发光 */
.contact__link-value {
  font-family: var(--font-mono);
  font-size: 1.22rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 16px rgba(125, 211, 252, 0.4));
  transition: filter 0.3s var(--ease);
}
a.contact__link-value {
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), filter 0.3s var(--ease);
}
a.contact__link-value:hover {
  border-color: rgba(125, 211, 252, 0.75);
  filter: drop-shadow(0 0 24px rgba(125, 211, 252, 0.75));
}

.copy-mini {
  flex: none;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-dim);
  cursor: pointer;
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease),
    background 0.3s var(--ease), transform 0.3s var(--ease);
}
.copy-mini:hover {
  color: #fff;
  border-color: rgba(125, 211, 252, 0.55);
  background: rgba(125, 211, 252, 0.12);
  transform: translateY(-1px);
}
.copy-mini svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* 详情面板里的联系方式行 */
.panel__val--stack {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 7px;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.015em;
}
.panel__val--stack > a,
.panel__val--stack > span {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 14px rgba(125, 211, 252, 0.35));
  transition: filter 0.3s var(--ease), border-color 0.3s var(--ease);
}
.panel__val--stack > a {
  border-bottom: 1px solid transparent;
}
.panel__val--stack > a:hover {
  border-color: rgba(125, 211, 252, 0.7);
  filter: drop-shadow(0 0 22px rgba(125, 211, 252, 0.7));
}

/* FAQ 里内联的微信号 */
.inline-mono {
  font-family: var(--font-mono);
  font-size: 1.04em;
  font-weight: 600;
  letter-spacing: -0.01em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.mobile-menu nav a em { font-style: normal; }

/* ---------- 新组件响应式 ---------- */
@media (max-width: 1024px) {
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step:not(:last-child)::after { display: none; }
}

@media (max-width: 680px) {
  .steps { grid-template-columns: 1fr; }
  .step__num { margin-bottom: 26px; }
  .offer { padding: 22px; }
  .offer__grid { grid-template-columns: 1fr; }
  .offer__actions .btn { width: 100%; }
  .about__actions .btn { width: 100%; }
  .faq__item p { padding: 0 26px 26px 4px; }
  .faq__item summary { gap: 16px; }
  .sale__domain { letter-spacing: -0.035em; }
  .contact__links { width: 100%; }
  .contact__link {
    width: 100%;
    max-width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
    row-gap: 4px;
  }
  .contact__link-label { flex: 1 0 100%; }
  .contact__link-value { font-size: 1.08rem; overflow-wrap: anywhere; }
  .panel__val--stack { align-items: flex-start; font-size: 0.95rem; }
}