/* =========================================================
   华韵光材 Huayun Photochromic — 官网样式
   深色光学科技风格 · 纯静态 · 无外部依赖
   ========================================================= */

:root {
  --bg: #07080f;
  --bg-alt: #0a0b14;
  --surface: #0e1120;
  --surface-2: #111426;
  --border: #1b2036;
  --border-soft: rgba(255, 255, 255, 0.06);

  --text: #ffffff;
  --text-2: #edeffa;
  --muted: #8e96b2;
  --faint: #6c7695;
  --dim: #4c5470;

  --violet: #7c5cff;
  --blue: #4c7dff;
  --cyan: #2fd8e4;
  --green: #3fe08a;
  --amber: #ffb44d;
  --coral: #ff7a5c;

  --grad: linear-gradient(90deg, #7c5cff 0%, #2fd8e4 60%, #ffb44d 100%);
  --grad-btn: linear-gradient(100deg, #7c5cff 0%, #2eb3e6 100%);

  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;

  --maxw: 1280px;
  --pad: 80px;
  --header-h: 76px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-2);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s ease;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
figure {
  margin: 0;
}

ul {
  padding: 0;
  list-style: none;
}

::selection {
  background: rgba(124, 92, 255, 0.4);
  color: #fff;
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: #07080f;
}
::-webkit-scrollbar-thumb {
  background: #232840;
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: #333a5c;
}

/* ---------- 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.section {
  position: relative;
  padding: 104px 0;
}

.section--alt {
  background: var(--bg-alt);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 64px;
  margin-bottom: 46px;
}

.section-head__left {
  max-width: 640px;
}

.section-head__note {
  max-width: 360px;
  font-size: 13px;
  line-height: 1.95;
  color: var(--faint);
  padding-bottom: 6px;
}

.eyebrow {
  display: block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--violet);
  margin-bottom: 14px;
  text-transform: uppercase;
}

.eyebrow--cyan {
  color: var(--cyan);
}
.eyebrow--amber {
  color: var(--amber);
}
.eyebrow--green {
  color: var(--green);
}

h1,
h2,
h3 {
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

h2 {
  font-size: clamp(26px, 2.9vw, 38px);
  line-height: 1.35;
}

.lead {
  font-size: 15px;
  line-height: 1.95;
  color: var(--muted);
}

.lead p + p {
  margin-top: 16px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 52px;
  padding: 0 30px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.25s ease, box-shadow 0.3s ease, background 0.3s ease,
    border-color 0.3s ease, color 0.25s ease;
}

.btn--primary {
  background: var(--grad-btn);
  color: #fff;
  box-shadow: 0 10px 30px -10px rgba(124, 92, 255, 0.75);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 38px -12px rgba(124, 92, 255, 0.95);
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.16);
  color: #d5dbea;
}

.btn--ghost:hover {
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.btn--light {
  background: #fff;
  color: #0a0b14;
}

.btn--light:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px -14px rgba(255, 255, 255, 0.5);
}

.btn--sm {
  height: 42px;
  padding: 0 22px;
  font-size: 14px;
}

/* ---------- 顶部导航 ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(7, 8, 15, 0.6);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.header.is-scrolled {
  background: rgba(7, 8, 15, 0.9);
  border-bottom-color: var(--border-soft);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.logo {
  display: flex;
  align-items: center;
  gap: 11px;
  flex-shrink: 0;
}

.logo__mark {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

.logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.logo__cn {
  font-size: 19px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.02em;
}

.logo__en {
  font-size: 8px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--faint);
  margin-top: 4px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 34px;
}

.nav a {
  position: relative;
  font-size: 14px;
  color: var(--muted);
  padding: 6px 0;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--grad);
  transition: width 0.3s ease;
}

.nav a:hover {
  color: #fff;
}

.nav a:hover::after,
.nav a.is-active::after {
  width: 100%;
}

.nav a.is-active {
  color: #fff;
  font-weight: 500;
}

.header__cta {
  flex-shrink: 0;
}

/* 汉堡按钮 */
.burger {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  cursor: pointer;
  padding: 0;
  position: relative;
}

.burger span {
  position: absolute;
  left: 12px;
  width: 18px;
  height: 1.5px;
  background: #fff;
  transition: transform 0.3s ease, opacity 0.25s ease;
}

.burger span:nth-child(1) {
  top: 16px;
}
.burger span:nth-child(2) {
  top: 21px;
}
.burger span:nth-child(3) {
  top: 26px;
}

.burger.is-open span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}
.burger.is-open span:nth-child(2) {
  opacity: 0;
}
.burger.is-open span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 86px) 0 100px;
  background:
    radial-gradient(900px 620px at 78% 42%, rgba(124, 92, 255, 0.16), transparent 62%),
    radial-gradient(760px 520px at 22% 78%, rgba(47, 216, 228, 0.09), transparent 66%),
    var(--bg);
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  align-items: center;
  gap: 56px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 15px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid var(--border);
  font-size: 12px;
  color: #a9b1cc;
  letter-spacing: 0.02em;
}

.badge i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 10px var(--green);
  flex-shrink: 0;
}

.hero h1 {
  margin: 26px 0 0;
  font-size: clamp(46px, 6.2vw, 82px);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.hero h1 .line {
  display: block;
}

.hero h1 .spectrum {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__sub {
  margin-top: 26px;
  max-width: 560px;
  font-size: 15px;
  line-height: 2;
  color: var(--muted);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 52px;
  margin-top: 48px;
  padding-top: 34px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.stat__num {
  font-size: 26px;
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.stat__label {
  margin-top: 4px;
  font-size: 12px;
  color: var(--faint);
}

/* 光谱视觉 */
.spectrum-visual {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 560px;
  margin-left: auto;
}

.spectrum-visual svg {
  width: 100%;
  height: 100%;
  display: block;
}

.spectrum-visual__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.05);
  animation: spin 60s linear infinite;
}

.spectrum-visual__ring::after {
  content: "";
  position: absolute;
  top: -3px;
  left: 50%;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  transform: translateX(-50%);
}

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

/* ---------- 卡片通用 ---------- */
.grid {
  display: grid;
  gap: 20px;
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  position: relative;
  padding: 28px;
  border-radius: var(--r-md);
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: transform 0.35s ease, border-color 0.35s ease, background 0.35s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: #2b3252;
  background: var(--surface-2);
}

.card__bar {
  width: 46px;
  height: 3px;
  border-radius: 2px;
  background: var(--grad);
  margin-bottom: 20px;
}

.card__index {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--dim);
  margin-bottom: 14px;
}

.card__title {
  font-size: 21px;
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.01em;
}

.card__desc {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.9;
  color: var(--muted);
}

.card__tags {
  margin-top: 16px;
  font-size: 12px;
  color: var(--faint);
  letter-spacing: 0.02em;
}

.card__spec {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  display: grid;
  gap: 9px;
}

.card__spec div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 12.5px;
}

.card__spec span {
  color: var(--faint);
}

.card__spec b {
  margin: 0;
  color: #d8ddf0;
  font-weight: 500;
  white-space: nowrap;
}

/* ---------- 关于（三理由） ---------- */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
  gap: 88px;
  align-items: start;
}

.reason {
  padding: 26px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.reason:first-child {
  border-top: none;
  padding-top: 0;
}

.reason__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.reason__idx {
  font-size: 12px;
  font-weight: 500;
  color: var(--dim);
  letter-spacing: 0.08em;
}

.reason__title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-2);
}

.reason__desc {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.9;
  color: #7c86a6;
}

/* ---------- 应用（bento） ---------- */
.bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 20px;
}

.bento__item {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 30px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: var(--surface);
  overflow: hidden;
  transition: transform 0.35s ease, border-color 0.35s ease;
}

.bento__item--md .bento__desc {
  margin-top: auto;
  padding-top: 22px;
}

.bento__item--sm .bento__desc {
  margin-top: auto;
  padding-top: 20px;
}

.bento__item:hover {
  transform: translateY(-4px);
  border-color: #2b3252;
}

.bento__item::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow, rgba(124, 92, 255, 0.28)) 0%, transparent 70%);
  pointer-events: none;
}

.bento__en {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--c, var(--violet));
}

.bento__title {
  margin-top: 14px;
  font-size: clamp(20px, 2vw, 24px);
  font-weight: 600;
  color: #fff;
  line-height: 1.42;
  letter-spacing: -0.01em;
}

.bento__desc {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.95;
  color: #9aa2bd;
  position: relative;
  z-index: 1;
}

.bento__item--lg {
  grid-column: span 6;
  min-height: 340px;
  display: flex;
  flex-direction: column;
}

.bento__item--md {
  grid-column: span 3;
  min-height: 340px;
}

.bento__item--sm {
  grid-column: span 4;
  min-height: 260px;
}

.bento__item--lg .bento__title {
  font-size: clamp(26px, 2.9vw, 34px);
  margin-top: 16px;
}

.bento__item--lg .bento__desc {
  margin-top: auto;
  padding-top: 24px;
  font-size: 14px;
  color: #c0c6dc;
  max-width: 92%;
}

/* ---------- 参数表 ---------- */
.spec-table {
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 6px 26px;
}

.spec-table__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 17px 0;
}

.spec-table__row + .spec-table__row {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.spec-table__key {
  font-size: 13px;
  color: #9aa2bd;
}

.spec-table__val {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.tech-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.94fr);
  gap: 80px;
  align-items: start;
}

.cap {
  padding: 24px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.cap:first-child {
  border-top: none;
  padding-top: 0;
}

/* ---------- 询价面板 ---------- */
.cta-panel {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 64px;
  align-items: center;
  padding: 60px;
  border-radius: var(--r-lg);
  border: 1px solid #29254a;
  overflow: hidden;
  background:
    radial-gradient(700px 420px at 12% 0%, rgba(124, 92, 255, 0.26), transparent 66%),
    radial-gradient(600px 400px at 92% 100%, rgba(47, 216, 228, 0.14), transparent 68%),
    linear-gradient(135deg, #101227 0%, #0d0f1e 100%);
}

.cta-panel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.contact-list {
  display: grid;
  gap: 0;
}

.contact-list__item {
  padding: 22px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.contact-list__item:first-child {
  border-top: none;
  padding-top: 0;
}

.contact-list__label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: #8b92ae;
}

.contact-list__value {
  display: block;
  margin-top: 7px;
  font-size: 17px;
  font-weight: 500;
  color: #fff;
  word-break: break-all;
}

.contact-list__value:hover {
  color: var(--cyan);
}

/* ---------- 页脚 ---------- */
.footer {
  background: #05060c;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 72px 0 34px;
}

.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 0.8fr));
  gap: 60px;
  padding-bottom: 44px;
}

.footer__tagline {
  margin-top: 18px;
  max-width: 300px;
  font-size: 12.5px;
  line-height: 1.95;
  color: var(--faint);
}

.footer__col h4 {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--dim);
  margin-bottom: 16px;
}

.footer__col li + li {
  margin-top: 12px;
}

.footer__col a {
  font-size: 13px;
  color: var(--muted);
  word-break: break-all;
}

.footer__col a:hover {
  color: #fff;
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 12px;
  color: var(--dim);
}

.footer__bottom a {
  color: var(--dim);
}

.footer__bottom a:hover {
  color: var(--muted);
}

/* ---------- 内页头 ---------- */
.page-hero {
  position: relative;
  padding: calc(var(--header-h) + 96px) 0 72px;
  overflow: hidden;
  background:
    radial-gradient(760px 460px at 82% 18%, rgba(124, 92, 255, 0.16), transparent 64%),
    radial-gradient(620px 420px at 8% 88%, rgba(47, 216, 228, 0.08), transparent 66%),
    var(--bg);
}

.page-hero__crumb {
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.06em;
  margin-bottom: 22px;
}

.page-hero__crumb a:hover {
  color: var(--muted);
}

.page-hero h1 {
  font-size: clamp(32px, 4.4vw, 56px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  max-width: 880px;
}

.page-hero__desc {
  margin-top: 24px;
  max-width: 680px;
  font-size: 15px;
  line-height: 2;
  color: var(--muted);
}

.page-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  margin-top: 44px;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  max-width: 880px;
}

/* ---------- 应用详情列表 ---------- */
.app-row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr) minmax(0, 1.25fr);
  gap: 40px;
  padding: 44px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  align-items: start;
}

.app-row:first-child {
  border-top: none;
}

.app-row__no {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--c, var(--violet));
  padding-top: 4px;
}

.app-row__title {
  font-size: clamp(22px, 2.2vw, 28px);
  font-weight: 600;
  color: #fff;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.app-row__sub {
  margin-top: 10px;
  font-size: 13px;
  color: var(--faint);
  letter-spacing: 0.02em;
}

.app-row__body {
  font-size: 14px;
  line-height: 2;
  color: var(--muted);
}

.app-row__body strong {
  color: #d8ddf0;
  font-weight: 500;
}

.app-row__points {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.app-row__points li {
  position: relative;
  padding-left: 18px;
  font-size: 13px;
  color: #9aa2bd;
}

.app-row__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--c, var(--violet));
  transform: rotate(45deg);
}

/* ---------- 数值条 ---------- */
.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: rgba(255, 255, 255, 0.07);
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--border);
}

.metric {
  padding: 32px 28px;
  background: var(--bg-alt);
}

.metric__num {
  font-size: 32px;
  font-weight: 600;
  color: #fff;
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.metric__num span + span {
  font-size: 14px;
  font-weight: 500;
  color: var(--faint);
  margin-left: 4px;
  letter-spacing: 0;
}

.metric__label {
  margin-top: 8px;
  font-size: 12.5px;
  color: var(--faint);
  line-height: 1.7;
}

/* ---------- 时间线 ---------- */
.timeline {
  display: grid;
  gap: 0;
  counter-reset: tl;
}

.tl-item {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 40px;
  padding: 30px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.tl-item:first-child {
  border-top: none;
}

.tl-year {
  font-size: 15px;
  font-weight: 600;
  color: var(--violet);
  letter-spacing: 0.02em;
}

.tl-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-2);
}

.tl-desc {
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.95;
  color: var(--muted);
}

/* ---------- 表单 ---------- */
.form {
  display: grid;
  gap: 18px;
}

.form__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.field {
  display: grid;
  gap: 9px;
}

.field label {
  font-size: 12.5px;
  color: var(--faint);
  letter-spacing: 0.02em;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 14px 16px;
  font-family: inherit;
  font-size: 14px;
  color: var(--text-2);
  background: #0b0d1a;
  border: 1px solid var(--border);
  border-radius: 10px;
  outline: none;
  transition: border-color 0.25s ease, background 0.25s ease;
  -webkit-appearance: none;
  appearance: none;
}

.field textarea {
  min-height: 130px;
  resize: vertical;
  line-height: 1.8;
}

.field select {
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236c7695' stroke-width='1.4' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: rgba(124, 92, 255, 0.6);
  background: #0d1020;
}

.field input::placeholder,
.field textarea::placeholder {
  color: #3f4664;
}

.form__note {
  font-size: 12px;
  color: var(--dim);
  line-height: 1.9;
}

/* ---------- 入场动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

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

/* ---------- 分页器 / 下一页 ---------- */
.next-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 34px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.next-link__label {
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.14em;
}

.next-link__title {
  margin-top: 8px;
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 600;
  color: #fff;
}

.next-link svg {
  flex-shrink: 0;
  color: var(--muted);
  transition: transform 0.3s ease, color 0.3s ease;
}

.next-link:hover svg {
  transform: translateX(6px);
  color: #fff;
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1180px) {
  :root {
    --pad: 48px;
  }

  .about-grid,
  .tech-grid {
    gap: 56px;
  }

  .bento__item--lg {
    grid-column: span 12;
    min-height: auto;
  }

  .bento__item--md {
    grid-column: span 6;
    min-height: 280px;
  }

  .bento__item--sm {
    grid-column: span 4;
  }

  .footer__top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 40px;
  }
}

@media (max-width: 960px) {
  :root {
    --pad: 32px;
    --header-h: 68px;
  }

  .section {
    padding: 76px 0;
  }

  .hero {
    padding: calc(var(--header-h) + 56px) 0 72px;
  }

  .hero__grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 48px;
  }

  .spectrum-visual {
    order: -1;
    max-width: 360px;
    margin: 0 auto;
  }

  .hero__stats {
    gap: 36px;
    margin-top: 36px;
    padding-top: 28px;
  }

  .nav {
    display: none;
  }

  .header__cta {
    display: none;
  }

  .burger {
    display: block;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

  .section-head__note {
    max-width: 100%;
  }

  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .bento__item--md {
    grid-column: span 6;
  }

  .bento__item--sm {
    grid-column: span 12;
    min-height: 200px;
  }

  .about-grid,
  .tech-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 48px;
  }

  .cta-panel {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
    padding: 40px 32px;
  }

  .app-row {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 20px 24px;
  }

  .app-row__body {
    grid-column: 2 / -1;
  }

  .metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tl-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .footer__top {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
  }
}

@media (max-width: 640px) {
  :root {
    --pad: 20px;
  }

  body {
    font-size: 14px;
  }

  .section {
    padding: 60px 0;
  }

  .grid--3,
  .grid--4,
  .grid--2 {
    grid-template-columns: minmax(0, 1fr);
  }

  .bento__item--md {
    grid-column: span 12;
    min-height: 220px;
  }

  .hero h1 {
    font-size: clamp(38px, 11vw, 52px);
  }

  .hero__actions .btn {
    width: 100%;
  }

  .hero__stats {
    gap: 24px 32px;
  }

  .stat__num {
    font-size: 22px;
  }

  .card {
    padding: 22px;
  }

  .cta-panel {
    padding: 32px 22px;
  }

  .cta-panel__actions .btn {
    width: 100%;
  }

  .spec-table {
    padding: 4px 18px;
  }

  .metrics {
    grid-template-columns: minmax(0, 1fr);
  }

  .metric {
    padding: 24px 22px;
  }

  .form__row {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer {
    padding: 56px 0 28px;
  }

  .page-hero {
    padding: calc(var(--header-h) + 52px) 0 52px;
  }
}

/* ---------- 移动端抽屉菜单 ---------- */
.drawer {
  position: fixed;
  inset: var(--header-h) 0 0 0;
  z-index: 99;
  background: rgba(7, 8, 15, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 32px var(--pad);
  display: none;
  flex-direction: column;
  gap: 4px;
  overflow-y: auto;
}

.drawer.is-open {
  display: flex;
}

.drawer a {
  padding: 16px 0;
  font-size: 17px;
  color: var(--muted);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.drawer a.is-active {
  color: #fff;
  font-weight: 500;
}

.drawer .btn {
  margin-top: 28px;
  width: 100%;
}

body.is-locked {
  overflow: hidden;
}