/* ==========================================================================
   otte · otteai.com
   纯静态官网样式。无外部字体、无第三方依赖（Google Fonts 在中国大陆不可用）。
   色板与 otte 应用内一致：冰蓝 + 暖砂 + 墨蓝灰。
   ========================================================================== */

:root {
  /* 冰蓝 */
  --ice-50: #f5f9fb;
  --ice-100: #eef5f9;
  --ice-200: #dce9f1;
  --ice-300: #c5dae7;
  --ice-400: #a9c7d9;
  /* 暖砂 */
  --sand-50: #fdfaf7;
  --sand-100: #f8f3ed;
  --sand-200: #ece2d8;
  --sand-300: #d9cdc1;
  /* 墨 */
  --ink: #2c2825;
  --ink-2: #48545a;
  --ink-3: #6d7880;
  --ink-4: #93a0a8;
  /* 语义 */
  --blue: #4a6f87;
  --blue-deep: #2f4d60;
  --green: #4c7563;
  --green-soft: #dde9e2;
  --line: #e2e9ee;
  --white: #ffffff;

  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", "Segoe UI", sans-serif;

  --shell: 1160px;
  --radius-s: 12px;
  --radius-m: 18px;
  --radius-l: 26px;
  --radius-xl: 34px;

  --shadow-s: 0 2px 8px rgba(48, 62, 72, 0.06);
  --shadow-m: 0 14px 36px -16px rgba(48, 62, 72, 0.24);
  --shadow-l: 0 36px 80px -28px rgba(40, 52, 62, 0.34);

  --ease: cubic-bezier(0.22, 0.68, 0.28, 1);
  --nav-h: 74px;
}

/* ---------- 重置 ---------- */
*,
*::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;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--sand-50);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; }
h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; }

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

.skip-link {
  position: absolute;
  top: 10px;
  left: 12px;
  z-index: 999;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  font-size: 14px;
  transform: translateY(-160%);
  transition: transform 0.2s var(--ease);
}
.skip-link:focus { transform: none; }

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 44px);
}

/* ---------- 排版 ---------- */
h1, h2, h3 { font-weight: 700; letter-spacing: -0.018em; text-wrap: balance; }
p, li { text-wrap: pretty; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
}
.eyebrow--pill {
  padding: 9px 16px 9px 13px;
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.66);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-s);
  letter-spacing: 0.06em;
}
.eyebrow--light { color: #a8c6d8; }
.eyebrow .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(76, 117, 99, 0.14);
}

.lede {
  max-width: 40em;
  color: var(--ink-2);
  font-size: 17px;
  line-height: 1.9;
}
.lede--light { color: #c3d3dc; }

.fineprint {
  color: var(--ink-3);
  font-size: 13.5px;
  line-height: 1.75;
}
.fineprint a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 54px;
  padding: 0 28px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
    background 0.25s var(--ease);
}
.btn svg { width: 16px; height: 16px; }

.btn--primary {
  border: 1px solid rgba(166, 150, 134, 0.6);
  background: linear-gradient(180deg, #ecdfd4, #d9cabd);
  color: #3d332b;
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.7),
    0 10px 24px -10px rgba(90, 71, 58, 0.5);
}
.btn--primary:hover {
  transform: translateY(-1px);
  background: linear-gradient(180deg, #f1e6dc, #ddcec1);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.8),
    0 16px 30px -12px rgba(90, 71, 58, 0.55);
}
.btn--primary:active {
  transform: translateY(0);
  background: #d9cdc1;
  box-shadow: inset 0 2px 5px rgba(90, 71, 58, 0.22);
}

.btn--ghost {
  border: 1px solid rgba(255, 255, 255, 0.9);
  background: rgba(255, 255, 255, 0.55);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  color: var(--ink-2);
  box-shadow: var(--shadow-s);
}
.btn--ghost:hover { background: rgba(255, 255, 255, 0.85); transform: translateY(-1px); }

.btn--block { width: 100%; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--nav-h);
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease),
    backdrop-filter 0.3s var(--ease);
}
.nav.is-scrolled {
  background: rgba(251, 249, 246, 0.93);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  box-shadow: 0 1px 0 rgba(180, 195, 205, 0.45);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  max-width: var(--shell);
  height: 100%;
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 44px);
}

.brand { display: flex; align-items: center; gap: 11px; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  overflow: hidden;
  background: linear-gradient(160deg, #eef5f9, #e4d8cb);
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-s);
}
.brand__mark img { width: 100%; height: 100%; object-fit: cover; }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__text strong { font-size: 19px; letter-spacing: -0.02em; }
.brand__text small { color: var(--ink-3); font-size: 11px; letter-spacing: 0.06em; }

.nav__links { display: flex; align-items: center; gap: 6px; }
.nav__links > a {
  padding: 9px 13px;
  border-radius: 999px;
  color: var(--ink-2);
  font-size: 14.5px;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}
.nav__links > a:hover { background: rgba(220, 233, 241, 0.6); color: var(--ink); }
.nav__links .nav__cta {
  margin-left: 8px;
  padding: 11px 20px;
  background: var(--ink);
  color: #fff;
  font-weight: 600;
}
.nav__links .nav__cta:hover { background: #3b3631; color: #fff; }

.nav__toggle { display: none; width: 44px; height: 44px; border-radius: 50%; }
.nav__toggle span {
  display: block;
  width: 18px;
  height: 1.6px;
  margin: 4px auto;
  border-radius: 2px;
  background: var(--ink);
  transition: transform 0.25s var(--ease), opacity 0.2s var(--ease);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--nav-h) + 46px);
  padding-bottom: 64px;
  background:
    radial-gradient(90% 70% at 78% 6%, rgba(255, 255, 255, 0.9), transparent 60%),
    linear-gradient(180deg, #eaf2f7 0%, #f2f7fa 38%, #fbf9f6 78%, #fdfaf7 100%);
  isolation: isolate;
}
.hero__ribbon {
  position: absolute;
  top: -8%;
  right: -14%;
  width: min(1180px, 105%);
  opacity: 0.5;
  transform: rotate(-8deg);
  z-index: -1;
  pointer-events: none;
  mix-blend-mode: soft-light;
}
.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  z-index: -1;
  pointer-events: none;
}
.hero__glow--a {
  top: 8%;
  right: 12%;
  width: 420px;
  height: 420px;
  background: rgba(197, 218, 231, 0.55);
}
.hero__glow--b {
  bottom: 4%;
  left: 4%;
  width: 360px;
  height: 360px;
  background: rgba(233, 223, 214, 0.6);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  align-items: center;
  gap: clamp(24px, 4vw, 48px);
}
.hero__copy { padding-bottom: 12px; }
.hero__title {
  max-width: 12em;
  font-size: clamp(38px, 5.4vw, 66px);
  line-height: 1.14;
  letter-spacing: -0.03em;
}
.hero__lede {
  max-width: 26em;
  margin-top: 24px;
  color: var(--ink-2);
  font-size: clamp(16px, 1.35vw, 18px);
  line-height: 1.9;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}
.hero__meta {
  margin-top: 18px;
  color: var(--ink-3);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.hero__stage {
  position: relative;
  min-height: 560px;
}
.hero__stage .device--back {
  position: absolute;
  top: 54px;
  left: -2%;
  width: 47%;
  transform: translate3d(0, var(--py, 0px), 0) rotate(-6.5deg);
}
.hero__stage .device--front {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 2;
  width: 57%;
  transform: translate3d(0, var(--py, 0px), 0) rotate(3deg);
}

.chip {
  position: absolute;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 12px 18px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  backdrop-filter: blur(16px) saturate(160%);
  box-shadow: 0 18px 38px -18px rgba(48, 62, 72, 0.4);
  color: var(--ink-2);
  font-size: 13.5px;
  white-space: nowrap;
}
.chip--a {
  top: 39%;
  left: -6%;
  transform: translate3d(0, var(--py, 0px), 0);
}
.chip--b {
  right: -4%;
  bottom: 12%;
  transform: translate3d(0, var(--py, 0px), 0);
}
.chip__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: none;
}
.chip__dot--blue { background: #6b9cbd; box-shadow: 0 0 0 4px rgba(107, 156, 189, 0.16); }
.chip__dot--green { background: var(--green); box-shadow: 0 0 0 4px rgba(76, 117, 99, 0.16); }

.hero__facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 40px);
  margin-top: clamp(48px, 7vw, 84px);
  padding-top: 30px;
  border-top: 1px solid rgba(180, 199, 210, 0.5);
}
.hero__facts li { display: flex; flex-direction: column; gap: 5px; }
.hero__facts strong { font-size: 17px; font-weight: 700; letter-spacing: -0.01em; }
.hero__facts span { color: var(--ink-3); font-size: 13.5px; line-height: 1.6; }

/* ---------- 手机外壳 ---------- */
.device {
  position: relative;
  margin: 0;
  padding: 9px;
  border-radius: 50px;
  background: linear-gradient(148deg, #554b44 0%, #2a2522 38%, #171312 58%, #3b342f 100%);
  box-shadow: var(--shadow-l), inset 0 0 0 1px rgba(255, 255, 255, 0.16);
  transform: translate3d(0, var(--py, 0px), 0);
}
.device img {
  display: block;
  width: 100%;
  border-radius: 41px;
  background: var(--ice-200);
}
.device::after {
  content: "";
  position: absolute;
  top: 16px;
  left: 50%;
  width: 24%;
  height: 20px;
  border-radius: 999px;
  background: #0b0a09;
  transform: translateX(-50%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.07);
}
.device::before {
  content: "";
  position: absolute;
  inset: 9px;
  z-index: 2;
  border-radius: 41px;
  background: linear-gradient(150deg, rgba(255, 255, 255, 0.16), transparent 26%);
  pointer-events: none;
}

/* ---------- 通用 section ---------- */
.section { position: relative; padding: clamp(72px, 9vw, 124px) 0; }
.section--today { background: var(--sand-50); }
.section--chat {
  background: linear-gradient(180deg, #f7f3ee 0%, #f2f7fa 46%, #f5f9fb 100%);
}
.section--memory { background: var(--sand-50); }
.section--roles {
  background: linear-gradient(180deg, #fdfaf7, #f8f3ed);
  padding-block: clamp(56px, 7vw, 96px);
}
.section__head { max-width: 720px; margin-bottom: clamp(36px, 5vw, 56px); }
.section__head--center { margin-inline: auto; text-align: center; }
.section__head h2 {
  font-size: clamp(28px, 3.6vw, 44px);
  line-height: 1.24;
  letter-spacing: -0.025em;
}
.section__head .lede { margin-top: 20px; }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
  align-items: center;
  gap: clamp(36px, 6vw, 84px);
}
.split--reverse .split__copy { order: 2; }
.split--reverse .split__stage { order: 1; }
.split__copy h2 {
  font-size: clamp(27px, 3.35vw, 41px);
  line-height: 1.26;
  letter-spacing: -0.025em;
}
.split__copy .lede { margin-top: 22px; }
.split__stage { position: relative; display: flex; justify-content: center; }
.split__stage::before {
  content: "";
  position: absolute;
  inset: 8% 4% 2%;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(197, 218, 231, 0.55), transparent 78%);
  filter: blur(24px);
  z-index: -1;
}
.split__stage .device { width: min(300px, 76%); }

/* ---------- 时间轴 ---------- */
.timeline {
  display: flex;
  flex-direction: column;
  margin-top: 34px;
  border-top: 1px solid var(--line);
}
.timeline li {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.timeline__time {
  color: var(--blue);
  font-size: 14px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  padding-top: 2px;
}
.timeline h3 { font-size: 16.5px; margin-bottom: 4px; }
.timeline p { color: var(--ink-3); font-size: 14.5px; line-height: 1.7; }
.timeline + .fineprint { margin-top: 18px; }

/* ---------- 能力标签 ---------- */
.pills { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.pills li {
  padding: 8px 15px;
  border: 1px solid rgba(255, 255, 255, 0.95);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  box-shadow: var(--shadow-s);
  color: var(--ink-2);
  font-size: 13.5px;
}

.quote {
  margin-top: 32px;
  padding: 4px 0 4px 22px;
  border-left: 2px solid var(--sand-300);
}
.quote p { font-size: clamp(19px, 1.6vw, 22px); font-weight: 700; letter-spacing: -0.02em; }
.quote footer { margin-top: 8px; color: var(--ink-3); font-size: 14px; line-height: 1.7; }

/* ---------- Bento ---------- */
.bento {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 26px);
}
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: clamp(26px, 3vw, 36px);
  padding-bottom: 0;
  overflow: hidden;
  border: 1px solid rgba(210, 224, 232, 0.8);
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, #fffdfb, #fbf8f5);
  box-shadow: var(--shadow-m);
}
.card--wide {
  grid-column: 1 / -1;
  flex-direction: row;
  align-items: center;
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(26px, 3vw, 36px);
}
.card__text { flex: 1 1 auto; min-width: 0; }
.card__kicker {
  display: inline-block;
  margin-bottom: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--ice-100);
  color: var(--blue);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
}
.card h3 {
  font-size: clamp(20px, 2vw, 25px);
  line-height: 1.35;
  letter-spacing: -0.02em;
}
.card p { margin-top: 12px; color: var(--ink-3); font-size: 15px; line-height: 1.8; }

.ticks { display: flex; flex-direction: column; gap: 9px; margin-top: 18px; }
.ticks li {
  position: relative;
  padding-left: 24px;
  color: var(--ink-2);
  font-size: 14.5px;
}
.ticks li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.55em;
  width: 10px;
  height: 6px;
  border-left: 1.6px solid var(--green);
  border-bottom: 1.6px solid var(--green);
  transform: rotate(-45deg);
}

.card__shot { flex: none; margin: 0; }
.card--wide .card__shot { width: min(280px, 34%); align-self: flex-end; }
.card--wide .card__shot img {
  display: block;
  width: 100%;
  max-height: 360px;
  object-fit: cover;
  object-position: top;
  border-radius: var(--radius-m) var(--radius-m) 0 0;
  border: 6px solid #2b2724;
  border-bottom: 0;
  box-shadow: 0 -12px 40px -20px rgba(44, 40, 37, 0.5);
}
.card__shot--bottom { margin: auto -6px -2px; }
.card__shot--bottom img {
  display: block;
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  object-position: top;
  border-radius: var(--radius-m) var(--radius-m) 0 0;
  border: 6px solid #2b2724;
  border-bottom: 0;
  box-shadow: 0 -14px 44px -22px rgba(44, 40, 37, 0.45);
}

/* ---------- 角色 ---------- */
.roles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 30px);
  margin-top: clamp(12px, 2vw, 24px);
}
.roles li {
  padding: 26px 24px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-l);
  background: rgba(255, 255, 255, 0.62);
  box-shadow: var(--shadow-s);
}
.roles__icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 16px;
  border-radius: 14px;
  background: linear-gradient(160deg, #eef5f9, #f3ece5);
  color: var(--blue-deep);
}
.roles__icon svg { width: 23px; height: 23px; }
.roles h3 { font-size: 17px; margin-bottom: 7px; }
.roles p { color: var(--ink-3); font-size: 14px; line-height: 1.75; }

/* ---------- 隐私 ---------- */
.section--privacy {
  background:
    radial-gradient(80% 60% at 15% 0%, rgba(74, 111, 135, 0.35), transparent 62%),
    radial-gradient(70% 60% at 92% 88%, rgba(76, 117, 99, 0.22), transparent 60%),
    #22303a;
  color: #f2f7fa;
}
.section--privacy::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image: url("assets/brand/ribbon.webp");
  background-size: 900px;
  background-position: 78% 40%;
  background-repeat: no-repeat;
  mix-blend-mode: soft-light;
  pointer-events: none;
}
.privacy {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: clamp(36px, 6vw, 76px);
  align-items: start;
}
.privacy h2 {
  font-size: clamp(28px, 3.5vw, 42px);
  line-height: 1.28;
  letter-spacing: -0.025em;
  color: #f7fafc;
}
.privacy .lede { margin-top: 20px; }
.privacy__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-l);
  background: rgba(255, 255, 255, 0.12);
}
.privacy__list li {
  padding: 26px 24px 28px;
  background: rgba(34, 48, 58, 0.72);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}
.privacy__list h3 {
  margin-bottom: 9px;
  color: #ffffff;
  font-size: 16.5px;
  letter-spacing: -0.01em;
}
.privacy__list p { color: #b9cbd6; font-size: 14px; line-height: 1.78; }

/* ---------- 预约 ---------- */
.section--waitlist {
  background:
    radial-gradient(70% 60% at 82% 12%, rgba(233, 223, 214, 0.85), transparent 62%),
    linear-gradient(180deg, #f4f8fa 0%, #fbf8f5 55%, #fdfaf7 100%);
}
.waitlist {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}
.waitlist h2 {
  font-size: clamp(30px, 3.8vw, 46px);
  line-height: 1.24;
  letter-spacing: -0.028em;
}
.waitlist h2 + .lede { margin-top: 22px; }
.waitlist .fineprint { margin-top: 22px; }

.form {
  padding: clamp(26px, 3.4vw, 38px);
  border: 1px solid rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.72);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  backdrop-filter: blur(20px) saturate(150%);
  box-shadow: var(--shadow-l);
}
.field { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.field label { font-size: 13.5px; font-weight: 600; color: var(--ink-2); }
.field__optional {
  margin-left: 8px;
  color: var(--ink-4);
  font-weight: 400;
  font-size: 12px;
}
.field input,
.field textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid #dbe4ea;
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.92);
  font-size: 15px;
  color: var(--ink);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.field input { min-height: 52px; }
.field textarea { resize: vertical; min-height: 92px; line-height: 1.65; }
.field input::placeholder,
.field textarea::placeholder { color: #a7b3ba; }
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: #a8c4d4;
  box-shadow: 0 0 0 4px rgba(168, 196, 212, 0.28);
}
.field input:user-invalid { border-color: #c98b7e; }
.field__hint { color: var(--ink-4); font-size: 12px; }

.honeypot {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.btn__spinner {
  display: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid rgba(60, 50, 42, 0.25);
  border-top-color: #3d332b;
  animation: spin 0.7s linear infinite;
}
.is-loading .btn__spinner { display: block; }
.is-loading .btn__label { opacity: 0.6; }

@keyframes spin { to { transform: rotate(360deg); } }

.form__legal { margin-top: 14px; color: var(--ink-4); font-size: 12px; line-height: 1.7; }
.form__legal a { color: var(--blue); text-decoration: underline; text-underline-offset: 2px; }
.form__status {
  display: none;
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 12px;
  font-size: 13.5px;
  line-height: 1.65;
}
.form__status.is-visible { display: block; }
.form__status.is-success { background: var(--green-soft); color: #2f5445; }
.form__status.is-error { background: #f7e7e2; color: #8a4b3c; }
.form__status.is-info { background: var(--ice-100); color: var(--blue-deep); }
.form__status a { text-decoration: underline; text-underline-offset: 2px; }

/* ---------- FAQ ---------- */
.section--faq { background: #fdfaf7; }
.faq {
  display: grid;
  grid-template-columns: minmax(0, 0.6fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}
.faq .section__head { margin-bottom: 0; position: sticky; top: calc(var(--nav-h) + 24px); }
.faq__list { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0;
  font-size: 16.5px;
  font-weight: 600;
  letter-spacing: -0.01em;
  cursor: pointer;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  flex: none;
  width: 11px;
  height: 11px;
  border-right: 1.6px solid var(--ink-3);
  border-bottom: 1.6px solid var(--ink-3);
  transform: translateY(-3px) rotate(45deg);
  transition: transform 0.25s var(--ease);
}
.faq details[open] summary::after { transform: translateY(2px) rotate(-135deg); }
.faq details p {
  max-width: 62ch;
  padding: 0 0 24px;
  color: var(--ink-3);
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 页脚 ---------- */
.footer {
  padding: clamp(48px, 6vw, 72px) 0 32px;
  background: #f4eee8;
  border-top: 1px solid rgba(210, 196, 183, 0.6);
}
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 36px;
}
.footer__brand { display: flex; align-items: center; gap: 14px; }
.footer__brand strong { font-size: 17px; }
.footer__brand p { margin-top: 3px; color: var(--ink-3); font-size: 13.5px; }
.footer__links { display: flex; gap: clamp(36px, 6vw, 80px); }
.footer__links h4 {
  margin-bottom: 12px;
  color: var(--ink-5, var(--ink-3));
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
}
.footer__links a {
  display: block;
  margin-bottom: 9px;
  color: var(--ink-2);
  font-size: 14px;
}
.footer__links a:hover { color: var(--blue); }
.footer__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  margin-top: clamp(32px, 4vw, 52px);
  padding-top: 22px;
  border-top: 1px solid rgba(210, 196, 183, 0.6);
  color: var(--ink-4);
  font-size: 12.5px;
}

/* ---------- 入场动画 ---------- */
/* 只有 JS 可用时才隐藏待入场元素：万一脚本被拦，内容也不会消失 */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
.js [data-reveal].is-visible { opacity: 1; transform: none; }
[data-reveal-delay="1"] { --reveal-delay: 90ms; }
[data-reveal-delay="2"] { --reveal-delay: 180ms; }
[data-reveal-delay="3"] { --reveal-delay: 270ms; }
[data-reveal-delay="4"] { --reveal-delay: 360ms; }
[data-reveal-delay="5"] { --reveal-delay: 450ms; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero__grid { grid-template-columns: 1fr; gap: 20px; }
  .hero__copy { max-width: 620px; }
  .hero__title { max-width: 14em; }
  .hero__stage {
    display: flex;
    justify-content: center;
    height: auto;
    min-height: 0;
    padding: 16px 0 24px;
  }
  .hero__stage .device--back { display: none; }
  .hero__stage .device--front {
    position: relative;
    top: auto;
    right: auto;
    width: min(360px, 58%);
    transform: translate3d(0, var(--py, 0px), 0) rotate(2.5deg);
  }
  .chip--a { left: auto; right: 4%; top: 5%; }
  .chip--b { right: auto; left: 3%; bottom: 8%; }
  .hero__facts { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 28px; }

  .split { grid-template-columns: 1fr; gap: 44px; }
  .split--reverse .split__copy { order: 1; }
  .split--reverse .split__stage { order: 2; }
  .split__copy { max-width: 640px; }
  .split__stage .device { width: min(300px, 68%); }

  .privacy { grid-template-columns: 1fr; gap: 40px; }
  .privacy__copy { max-width: 620px; }

  .waitlist { grid-template-columns: 1fr; }
  .waitlist__copy { max-width: 600px; }

  .faq { grid-template-columns: 1fr; }
  .faq .section__head { position: static; }
}

@media (max-width: 860px) {
  .roles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bento { grid-template-columns: 1fr; }
  .card--wide { flex-direction: column; align-items: stretch; }
  .card--wide .card__shot { width: min(260px, 62%); align-self: center; }
}

@media (max-width: 720px) {
  :root { --nav-h: 64px; }

  .nav.is-scrolled { background: rgba(251, 249, 246, 0.92); }
  .nav__toggle { display: block; }
  .nav__links {
    position: absolute;
    top: calc(var(--nav-h) + 4px);
    left: clamp(16px, 5vw, 24px);
    right: clamp(16px, 5vw, 24px);
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px;
    border: 1px solid rgba(255, 255, 255, 0.9);
    border-radius: 22px;
    background: rgba(251, 249, 246, 0.94);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    backdrop-filter: blur(20px) saturate(160%);
    box-shadow: var(--shadow-m);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.22s var(--ease), transform 0.22s var(--ease),
      visibility 0.22s;
  }
  .nav__links > a { font-size: 15px; padding: 13px 14px; }
  .nav__links .nav__cta { margin-left: 0; margin-top: 6px; text-align: center; }
  .nav.is-open .nav__links { opacity: 1; visibility: visible; transform: none; }
  .nav.is-open .nav__toggle span:first-child { transform: translateY(2.8px) rotate(45deg); }
  .nav.is-open .nav__toggle span:last-child { transform: translateY(-2.8px) rotate(-45deg); }

  .hero { padding-top: calc(var(--nav-h) + 26px); }
  .hero__title { max-width: none; }
  .hero__actions .btn { flex: 1 1 auto; }
  .hero__stage {
    display: flex;
    justify-content: center;
    height: auto;
    padding: 18px 0 8px;
  }
  .hero__stage .device--back { display: none; }
  .hero__stage .device--front {
    position: relative;
    top: auto;
    right: auto;
    width: min(260px, 72%);
    transform: translate3d(0, var(--py, 0px), 0) rotate(2deg);
  }
  .chip--a { left: auto; right: -2%; top: 4%; font-size: 12.5px; padding: 10px 14px; }
  .chip--b { right: auto; left: -2%; bottom: 9%; font-size: 12.5px; padding: 10px 14px; }

  .privacy__list { grid-template-columns: 1fr; }
  .roles { grid-template-columns: 1fr; }
  .roles li { padding: 22px; }

  .timeline li { grid-template-columns: 64px minmax(0, 1fr); gap: 12px; }
  .quote { padding-left: 18px; }
  .footer__inner { flex-direction: column; }
  .footer__links { gap: 40px; }
}

@media (max-width: 460px) {
  .hero__facts { grid-template-columns: 1fr; }
  .hero__facts li { flex-direction: row; align-items: baseline; gap: 10px; }
  .hero__facts span { font-size: 13px; }
  .form { padding: 22px 18px; }
  .btn { min-height: 50px; padding: 0 22px; font-size: 15px; }
}

/* ---------- 减少动态效果 ---------- */
@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 [data-reveal] { opacity: 1; transform: none; }
  .device,
  .chip { transform: none !important; }
}