/* =========================================================
   RadiLab / 无锡锐雷电子
   Original design system. No external dependencies.
   ========================================================= */

:root {
  --ink: #0a0f1a;
  --ink-2: #0d1524;
  --ink-3: #111b2c;
  --panel: #101a2b;
  --line-dark: rgba(160, 190, 240, 0.13);
  --line-light: #e3e8f0;
  --paper: #f4f6fa;
  --white: #ffffff;
  --text: #0b1220;
  --muted: #5b6577;
  --muted-dark: #9aa9c0;
  --soft-dark: #c9d5e8;
  --blue: #2f6bff;
  --blue-light: #6e9bff;
  --blue-soft: #e8efff;
  --teal: #00b7a1;
  --orange: #ff7a45;
  --radius: 14px;
  --radius-sm: 9px;
  --max: 1200px;
  --header-h: 72px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial,
    sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, "Courier New",
    monospace;
  --shadow-sm: 0 1px 2px rgba(11, 18, 32, 0.05), 0 8px 24px rgba(11, 18, 32, 0.04);
  --shadow-md: 0 18px 50px rgba(11, 18, 32, 0.12);
}

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

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

body {
  margin: 0;
  color: var(--text);
  background: var(--white);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

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

button {
  font: inherit;
  color: inherit;
}

::selection {
  background: var(--blue);
  color: #fff;
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 16px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--blue);
  color: #fff;
  border-radius: 8px;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 12px;
}

.container {
  width: min(100% - 48px, var(--max));
  margin-inline: auto;
}

.section {
  padding: 104px 0;
}

.section--tight {
  padding: 72px 0;
}

.section--paper {
  background: var(--paper);
}

.section--dark {
  background: var(--ink);
  color: var(--soft-dark);
}

.section--dark h2,
.section--dark h3,
.section--dark strong {
  color: #f2f6ff;
}

.section-head {
  max-width: 760px;
  margin-bottom: 52px;
}

.section-head--center {
  margin-inline: auto;
  text-align: center;
}

.section-head--wide {
  max-width: 900px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section--dark .eyebrow {
  color: var(--blue-light);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
}

.section-head--center .eyebrow::before {
  display: none;
}

h1,
h2,
h3,
h4 {
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 650;
}

h2 {
  font-size: clamp(30px, 4vw, 44px);
  text-wrap: balance;
}

h3 {
  font-size: 20px;
  letter-spacing: -0.01em;
}

.lede {
  margin-top: 20px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.75;
}

.section--dark .lede {
  color: var(--muted-dark);
}

.lede--small {
  font-size: 16px;
}

.button-row {
  margin-top: 28px;
}

.mt-24 {
  margin-top: 24px;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.nowrap {
  white-space: nowrap;
}

.grad {
  background: linear-gradient(100deg, #6e9bff 0%, #00c2a8 58%, #8ef0de 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- buttons / tags ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease,
    box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:focus-visible {
  outline: 2px solid var(--blue-light);
  outline-offset: 3px;
}

.btn-primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 10px 26px rgba(47, 107, 255, 0.28);
}

.btn-primary:hover {
  background: #3f78ff;
}

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.2);
  color: #eaf0ff;
  background: rgba(255, 255, 255, 0.03);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.07);
}

.btn-outline {
  border-color: var(--line-light);
  color: var(--text);
  background: #fff;
}

.btn-outline:hover {
  border-color: #c8d2e3;
  box-shadow: var(--shadow-sm);
}

.btn-sm {
  min-height: 40px;
  padding: 0 16px;
  font-size: 13px;
}

.btn .arrow {
  font-family: var(--font-mono);
  transition: transform 0.2s ease;
}

.btn:hover .arrow {
  transform: translateX(3px);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.tag::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
}

.tag--current {
  color: #067a6d;
  background: #e4f8f4;
}

.tag--planned {
  color: #a34a24;
  background: #fff0e8;
}

.tag--dev {
  color: #2456d8;
  background: var(--blue-soft);
}

.tag--dark {
  color: #9db8ff;
  background: rgba(47, 107, 255, 0.14);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid rgba(255, 122, 69, 0.35);
  border-radius: 999px;
  color: #ffb08c;
  background: rgba(255, 122, 69, 0.09);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
}

.badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 69, 0.16);
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(10, 15, 26, 0.82);
  border-bottom: 1px solid rgba(160, 190, 240, 0.1);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.site-header.is-scrolled {
  background: rgba(10, 15, 26, 0.96);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 30px;
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex: 0 0 auto;
}

.brand-mark {
  width: 31px;
  height: 31px;
  flex: 0 0 auto;
  border-radius: 8px;
}

.brand-cn-text {
  color: #f2f6ff;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.07em;
  white-space: nowrap;
}

.brand-divider {
  width: 1px;
  height: 22px;
  background: rgba(255, 255, 255, 0.22);
}

.brand-en {
  color: #f2f6ff;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.24em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav-link {
  position: relative;
  padding: 9px 13px;
  color: #b9c6dc;
  border-radius: 8px;
  font-size: 14px;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}

.nav-link.is-active {
  color: #fff;
}

.nav-link.is-active::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 2px;
  height: 1px;
  background: linear-gradient(90deg, var(--blue-light), var(--teal));
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 50%;
  color: #b9c6dc;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.lang-switch:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  margin: 4px auto;
  background: #dbe5f7;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 92px;
  background: var(--ink);
  color: var(--soft-dark);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(110, 155, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(110, 155, 255, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, #000 0%, #000 55%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 55%, transparent 100%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  top: -20%;
  right: -8%;
  width: 60vw;
  height: 60vw;
  max-width: 820px;
  max-height: 820px;
  background: radial-gradient(circle, rgba(47, 107, 255, 0.18) 0%, transparent 62%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  gap: 64px;
  align-items: center;
}

.hero-copy h1 {
  max-width: 620px;
  margin-top: 4px;
  color: #f4f8ff;
  font-size: clamp(42px, 5.4vw, 70px);
  font-weight: 650;
  line-height: 1.06;
  letter-spacing: -0.035em;
}

.hero-copy .lede {
  max-width: 560px;
  margin-top: 26px;
  color: #a9b8cf;
  font-size: 17.5px;
}

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

.hero-status {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--line-dark);
  color: #8294b0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.hero-status strong {
  color: #e8f0ff;
  font-weight: 600;
}

.hero-status .sep {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #40557a;
}

.hero-visual {
  position: relative;
}

.visual-frame {
  position: relative;
  padding: 18px;
  border: 1px solid rgba(110, 155, 255, 0.18);
  border-radius: 22px;
  background: rgba(13, 21, 36, 0.66);
  box-shadow: 0 40px 100px rgba(0, 0, 0, 0.35);
}

.visual-frame::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px dashed rgba(110, 155, 255, 0.12);
  border-radius: 15px;
  pointer-events: none;
}

.visual-frame > img {
  width: 100%;
  height: auto;
}

.float-card {
  position: absolute;
  z-index: 2;
  min-width: 132px;
  padding: 11px 14px;
  border: 1px solid rgba(110, 155, 255, 0.28);
  border-radius: 11px;
  background: rgba(8, 14, 25, 0.9);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-family: var(--font-mono);
}

.float-card--a {
  top: 9%;
  left: -3%;
}

.float-card--b {
  right: -3%;
  bottom: 11%;
}

.float-card .label {
  color: #7f93b2;
  font-size: 9px;
  letter-spacing: 0.12em;
}

.float-card .value {
  margin-top: 3px;
  color: #eaf1ff;
  font-size: 14px;
  font-weight: 600;
}

.float-card .value em {
  color: var(--teal);
  font-style: normal;
}

.float-card .sub {
  margin-top: 2px;
  color: #8294b0;
  font-size: 9.5px;
}

.caption {
  margin-top: 16px;
  color: #6f82a0;
  font-size: 11.5px;
  text-align: center;
}

/* ---------- cards / grids ---------- */

.grid {
  display: grid;
  gap: 22px;
}

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

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

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

.card {
  position: relative;
  padding: 30px;
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.card--flat {
  box-shadow: none;
}

.card--dark {
  border-color: var(--line-dark);
  background: linear-gradient(160deg, rgba(23, 36, 58, 0.9), rgba(11, 19, 32, 0.96));
  box-shadow: none;
}

.card h3 {
  margin-bottom: 10px;
}

.card p {
  color: var(--muted);
  font-size: 14.5px;
}

.card--dark p {
  color: var(--muted-dark);
}

.card .num {
  display: block;
  margin-bottom: 22px;
  color: #c3d0e6;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.icon-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  margin-bottom: 22px;
  border: 1px solid #dbe5ff;
  border-radius: 12px;
  background: var(--blue-soft);
  color: var(--blue);
}

.icon-chip svg {
  width: 22px;
  height: 22px;
}

.card--dark .icon-chip {
  border-color: rgba(110, 155, 255, 0.25);
  background: rgba(47, 107, 255, 0.12);
  color: var(--blue-light);
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

/* ---------- steps ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0;
  margin-top: 12px;
}

.step {
  position: relative;
  padding: 0 20px 0 0;
}

.step::before {
  content: "";
  position: absolute;
  top: 17px;
  left: 36px;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, #c9d7f2, #e7edf7);
}

.step:last-child::before {
  display: none;
}

.step-index {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  margin-bottom: 18px;
  border: 1px solid #c9d7f2;
  border-radius: 50%;
  background: #fff;
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
}

.step h3 {
  margin-bottom: 6px;
  font-size: 16px;
}

.step p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

/* ---------- application cards ---------- */

.app-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.app-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.app-visual {
  padding: 18px 18px 0;
  background: linear-gradient(180deg, #0b1320, #0e1929);
}

.app-visual img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.app-body {
  padding: 24px 26px 28px;
}

.app-body h3 {
  margin: 12px 0 8px;
}

.app-body p {
  color: var(--muted);
  font-size: 14px;
}

.app-body .meta {
  display: grid;
  gap: 6px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line-light);
  color: var(--muted);
  font-size: 12.5px;
}

.app-body .meta b {
  color: var(--text);
  font-weight: 600;
}

/* ---------- roadmap / timeline ---------- */

.roadmap {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 12px;
}

.roadmap-item {
  position: relative;
  padding: 24px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: rgba(16, 26, 43, 0.7);
}

.roadmap-item.is-current {
  border-color: rgba(47, 107, 255, 0.55);
  background: linear-gradient(160deg, rgba(47, 107, 255, 0.16), rgba(16, 26, 43, 0.8));
}

.roadmap-item .phase {
  color: #7f93b2;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
}

.roadmap-item h3 {
  margin: 10px 0 8px;
  color: #f2f6ff;
  font-size: 17px;
}

.roadmap-item p {
  color: var(--muted-dark);
  font-size: 13px;
}

.roadmap-item .state {
  display: inline-flex;
  margin-top: 16px;
  color: var(--blue-light);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
}

.roadmap-item.is-current .state {
  color: var(--teal);
}

/* light-section variant (about page) */
.section:not(.section--dark) .roadmap-item {
  border-color: var(--line-light);
  background: #fff;
}

.section:not(.section--dark) .roadmap-item.is-current {
  border-color: #b9ccf7;
  background: linear-gradient(160deg, #eef4ff, #f8fbff);
}

.section:not(.section--dark) .roadmap-item .phase {
  color: var(--muted);
}

.section:not(.section--dark) .roadmap-item h3 {
  color: var(--text);
}

.section:not(.section--dark) .roadmap-item p {
  color: var(--muted);
}

.section:not(.section--dark) .roadmap-item .state {
  color: var(--blue);
}

.section:not(.section--dark) .roadmap-item.is-current .state {
  color: #067a6d;
}

/* ---------- product hero ---------- */

.product-hero {
  position: relative;
  overflow: hidden;
  padding: 76px 0 64px;
  background: var(--ink);
  color: var(--soft-dark);
}

.product-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(110, 155, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(110, 155, 255, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, #000, transparent 92%);
  -webkit-mask-image: linear-gradient(to bottom, #000, transparent 92%);
  pointer-events: none;
}

.product-hero .container {
  position: relative;
  z-index: 1;
}

.product-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 54px;
  align-items: center;
}

.product-hero h1 {
  margin-top: 12px;
  color: #f4f8ff;
  font-size: clamp(40px, 5vw, 64px);
  letter-spacing: -0.04em;
}

.product-hero .product-sub {
  margin-top: 6px;
  color: var(--blue-light);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
}

.product-hero .lede {
  max-width: 540px;
  color: #a9b8cf;
}

.quick-facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin-top: 40px;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.quick-fact {
  padding: 20px 18px;
  border-right: 1px solid var(--line-dark);
}

.quick-fact:last-child {
  border-right: 0;
}

.quick-fact .k {
  color: #7f93b2;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
}

.quick-fact .v {
  margin-top: 4px;
  color: #eef4ff;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
}

.quick-fact .n {
  margin-top: 2px;
  color: #6f82a0;
  font-size: 10.5px;
}

/* ---------- principle ---------- */

.principle {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.principle-item {
  position: relative;
  padding: 28px;
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  background: #fff;
}

.principle-item .k {
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.principle-item h3 {
  margin: 12px 0 8px;
}

.principle-item p {
  color: var(--muted);
  font-size: 14px;
}

.principle-note {
  margin-top: 18px;
  padding: 16px 20px;
  border-left: 2px solid var(--blue);
  background: var(--blue-soft);
  color: #33518c;
  font-size: 13.5px;
}

/* ---------- split sections ---------- */

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 56px;
  align-items: center;
}

.split--reverse {
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
}

.split-copy h2 {
  margin-bottom: 18px;
}

.split-copy p {
  color: var(--muted);
  font-size: 15.5px;
}

.split-copy p + p {
  margin-top: 14px;
}

.check-list {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.check-list li {
  position: relative;
  padding-left: 26px;
  color: var(--text);
  font-size: 14.5px;
}

.check-list li::before {
  content: "";
  position: absolute;
  top: 0.55em;
  left: 0;
  width: 10px;
  height: 10px;
  border: 2px solid var(--teal);
  border-radius: 50%;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 26px;
}

.stat {
  padding: 16px;
  border: 1px solid var(--line-light);
  border-radius: var(--radius-sm);
  background: #fff;
}

.stat .v {
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 650;
}

.stat .k {
  margin-top: 2px;
  color: var(--muted);
  font-size: 11px;
}

/* ---------- UI mock ---------- */

.ui-mock {
  overflow: hidden;
  border: 1px solid #223553;
  border-radius: 14px;
  background: #0d1624;
  box-shadow: 0 30px 80px rgba(11, 18, 32, 0.28);
  font-family: var(--font-mono);
}

.ui-titlebar {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 38px;
  padding: 0 14px;
  border-bottom: 1px solid #1e304b;
  background: #101c2d;
  color: #9fb1cc;
  font-size: 10.5px;
}

.ui-dots {
  display: inline-flex;
  gap: 5px;
}

.ui-dots i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #355070;
}

.ui-dots i:first-child {
  background: #ff7a45;
}

.ui-dots i:nth-child(2) {
  background: #ffd166;
}

.ui-dots i:nth-child(3) {
  background: #00c2a8;
}

.ui-titlebar .ui-device {
  margin-left: auto;
  color: #6e9bff;
}

.ui-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid #1e304b;
  background: #0f1a2b;
}

.ui-modes {
  display: flex;
  gap: 4px;
}

.ui-tab {
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: 5px;
  background: transparent;
  color: #7f93b2;
  font-size: 10px;
  cursor: default;
}

.ui-tab.is-active {
  border-color: #2f6bff;
  background: rgba(47, 107, 255, 0.18);
  color: #cfe0ff;
}

.ui-tab[disabled] {
  color: #4b5f7e;
}

.ui-actions {
  display: flex;
  gap: 5px;
  margin-left: auto;
}

.ui-actions span {
  padding: 5px 8px;
  border: 1px solid #243b5c;
  border-radius: 4px;
  color: #8fa3c4;
  font-size: 9px;
}

.ui-actions span.hot {
  border-color: #2f6bff;
  color: #cfe0ff;
}

.ui-body {
  display: grid;
  grid-template-columns: 168px minmax(0, 1fr) 138px;
  min-height: 320px;
}

.ui-side,
.ui-info {
  padding: 14px 12px;
  background: #0c1524;
}

.ui-side {
  border-right: 1px solid #1e304b;
}

.ui-info {
  border-left: 1px solid #1e304b;
}

.ui-group + .ui-group {
  margin-top: 16px;
}

.ui-group h4 {
  margin-bottom: 7px;
  color: #8fa3c4;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.ui-field {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-top: 5px;
  color: #7f93b2;
  font-size: 9px;
}

.ui-field b {
  padding: 3px 6px;
  border: 1px solid #243b5c;
  border-radius: 3px;
  color: #c7d6ee;
  background: #101d31;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.ui-chart {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  background: #fff;
}

.ui-chart img {
  width: 100%;
  height: auto;
  border-radius: 6px;
}

.ui-readout {
  margin-top: 6px;
  padding: 8px;
  border: 1px solid #243b5c;
  border-radius: 5px;
  background: #101d31;
}

.ui-readout .k {
  color: #6f82a0;
  font-size: 8px;
}

.ui-readout .v {
  margin-top: 2px;
  color: #e8f0ff;
  font-size: 12px;
}

.ui-readout .v.blue {
  color: #6e9bff;
}

.ui-readout .v.orange {
  color: #ff9a6e;
}

.ui-status {
  display: flex;
  justify-content: space-between;
  padding: 7px 14px;
  border-top: 1px solid #1e304b;
  background: #0f1a2b;
  color: #6f82a0;
  font-size: 9px;
}

.ui-status .ok {
  color: #00c2a8;
}

.ui-caption {
  margin-top: 14px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

/* ---------- specification table ---------- */

.shot-frame {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-md);
}

.shot-frame img {
  display: block;
  width: 100%;
  height: auto;
}

.diagram-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.diagram-hint {
  display: none;
  margin: 0;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line-light);
  background: #fbfcfe;
  color: var(--muted);
  font-size: 12px;
}

#impedance-roadmap {
  scroll-margin-top: 92px;
}

.shot-frame figcaption {
  padding: 14px 18px;
  border-top: 1px solid var(--line-light);
  background: #fbfcfe;
  color: var(--muted);
  font-size: 12.5px;
}

.shot-frame figcaption a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.table-hint {
  display: none;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 12px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  background: #fff;
  -webkit-overflow-scrolling: touch;
}

.spec-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  text-align: left;
}

.spec-table th,
.spec-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--line-light);
  vertical-align: top;
  font-size: 13.5px;
}

.spec-table th {
  background: #f8fafd;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.spec-table td:first-child {
  color: var(--text);
  font-weight: 600;
  white-space: nowrap;
}

.spec-table td {
  color: var(--muted);
}

.spec-table tr:last-child td {
  border-bottom: 0;
}

.spec-table .current {
  color: #086b60;
}

.spec-table .planned {
  color: #a34a24;
}

.spec-note {
  margin-top: 14px;
  color: var(--muted);
  font-size: 12px;
}

/* ---------- CTA ---------- */

.cta-band {
  position: relative;
  overflow: hidden;
  padding: 72px 0;
  background: linear-gradient(120deg, #0c1830 0%, #10264c 55%, #0b2e33 100%);
  color: #e8f0ff;
}

.cta-band::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 520px;
  height: 520px;
  border: 1px solid rgba(110, 155, 255, 0.2);
  border-radius: 50%;
  box-shadow: 0 0 0 60px rgba(110, 155, 255, 0.04),
    0 0 0 120px rgba(110, 155, 255, 0.03);
  pointer-events: none;
}

.cta-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.cta-inner h2 {
  max-width: 760px;
  font-size: clamp(28px, 3.4vw, 40px);
  text-wrap: balance;
}

.cta-inner p {
  max-width: 620px;
  margin-top: 10px;
  color: #a9b8cf;
  font-size: 15px;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  flex: 0 0 auto;
}

/* ---------- footer ---------- */

.site-footer {
  padding: 64px 0 28px;
  background: #080d16;
  color: #8294b0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, minmax(0, 0.7fr));
  gap: 36px;
  padding-bottom: 44px;
  border-bottom: 1px solid rgba(160, 190, 240, 0.1);
}

.footer-lockup {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.footer-lockup .brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
}

.footer-brand p {
  max-width: 320px;
  margin-top: 16px;
  color: #6f82a0;
  font-size: 13px;
}

.footer-col h4 {
  margin-bottom: 14px;
  color: #dbe5f7;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.footer-col li + li {
  margin-top: 9px;
}

.footer-col a,
.footer-col span {
  color: #8294b0;
  font-size: 13px;
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 24px;
  color: #5e7395;
  font-size: 11.5px;
}

.footer-bottom a {
  color: #6f82a0;
}

.footer-bottom a:hover {
  color: #fff;
}

/* ---------- contact ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 24px;
  align-items: start;
}

.contact-card {
  padding: 32px;
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.contact-card--dark {
  border-color: var(--line-dark);
  background: var(--ink-2);
  color: var(--soft-dark);
  box-shadow: none;
}

.contact-list {
  display: grid;
  gap: 18px;
  margin-top: 22px;
}

.contact-item .k {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
}

.contact-item .v {
  margin-top: 4px;
  color: var(--text);
  font-size: 15px;
}

.contact-card--dark .contact-item .k {
  color: #7f93b2;
}

.contact-card--dark .contact-item .v {
  color: #eef4ff;
}

.contact-card--dark h2,
.contact-card--dark h3 {
  color: #f2f6ff;
}

.contact-card--dark .lede {
  color: var(--muted-dark);
}

.contact-card--dark .check-list li {
  color: #e8f0ff;
}

.contact-card--dark .check-list li::before {
  border-color: var(--teal);
}

.contact-card--dark .contact-links a {
  border-color: var(--line-dark);
  background: rgba(255, 255, 255, 0.03);
  color: #e8f0ff;
}

.contact-card--dark .contact-links a:hover {
  border-color: rgba(110, 155, 255, 0.4);
}

.placeholder {
  display: inline-block;
  padding: 1px 7px;
  border-bottom: 1px dashed currentColor;
  color: #a34a24;
  background: #fff3ec;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.92em;
}

.contact-card--dark .placeholder {
  color: #ffb08c;
  background: rgba(255, 122, 69, 0.1);
}

.contact-note {
  margin-top: 22px;
  padding: 14px 16px;
  border-left: 2px solid var(--orange);
  background: #fff7f2;
  color: #8a4a2a;
  font-size: 12.5px;
}

.contact-card--dark .contact-note {
  background: rgba(255, 122, 69, 0.07);
  color: #ffb08c;
}

.contact-links {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.contact-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line-light);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--text);
  font-size: 14px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.contact-links a:hover {
  border-color: #c8d2e3;
  transform: translateY(-1px);
}

/* ---------- about ---------- */

.about-hero {
  padding: 72px 0 60px;
  background: var(--ink);
  color: var(--soft-dark);
}

.about-hero h1 {
  max-width: 880px;
  color: #f4f8ff;
  font-size: clamp(34px, 4.4vw, 56px);
  letter-spacing: -0.035em;
}

.about-hero .lede {
  max-width: 720px;
  color: #a9b8cf;
}

.values {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.values .value {
  padding: 26px;
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  background: #fff;
}

.values .value .k {
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.values .value h3 {
  margin: 10px 0 8px;
  font-size: 17px;
}

.values .value p {
  color: var(--muted);
  font-size: 13.5px;
}

.stage-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.stage-copy {
  padding: 34px;
}

.stage-copy h3 {
  color: #f2f6ff;
}

.stage-copy p {
  margin-top: 12px;
  color: var(--muted-dark);
  font-size: 14px;
}

.stage-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 22px;
  background: radial-gradient(circle at 60% 40%, rgba(47, 107, 255, 0.16), transparent 65%);
}

.stage-visual img {
  width: 100%;
  max-width: 430px;
  border-radius: 10px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

/* ---------- 404 ---------- */

.error-page {
  display: flex;
  align-items: center;
  min-height: 62vh;
  padding: 80px 0;
}

.error-code {
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: clamp(72px, 14vw, 150px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.06em;
}

.error-page h1 {
  margin-top: 18px;
  font-size: clamp(28px, 4vw, 40px);
}

.error-page p {
  max-width: 560px;
  margin-top: 14px;
  color: var(--muted);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- reveal ---------- */

.reveal {
  opacity: 1;
  transform: none;
}

.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.reveal-delay-1 {
  transition-delay: 0.08s;
}

.reveal-delay-2 {
  transition-delay: 0.16s;
}

.reveal-delay-3 {
  transition-delay: 0.24s;
}

/* ---------- responsive ---------- */

@media (max-width: 1080px) {
  .hero-grid,
  .product-hero-grid {
    gap: 40px;
  }

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

  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px 0;
  }

  .step:nth-child(3)::before {
    display: none;
  }

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

  .footer-grid {
    grid-template-columns: 1.3fr repeat(3, minmax(0, 0.8fr));
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 64px;
  }

  .section {
    padding: 76px 0;
  }

  .hero {
    padding: 64px 0 70px;
  }

  .hero-grid,
  .product-hero-grid,
  .split,
  .split--reverse,
  .contact-grid,
  .stage-card {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-visual {
    order: 2;
    margin-top: 10px;
  }

  .float-card--a {
    left: 2%;
  }

  .float-card--b {
    right: 2%;
  }

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

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

  .quick-fact:nth-child(2) {
    border-right: 0;
  }

  .quick-fact:nth-child(1),
  .quick-fact:nth-child(2) {
    border-bottom: 1px solid var(--line-dark);
  }

  .ui-body {
    grid-template-columns: 150px minmax(0, 1fr);
  }

  .ui-info {
    display: none;
  }

  .cta-inner {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }

  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 14px 24px 22px;
    border-bottom: 1px solid rgba(160, 190, 240, 0.12);
    background: rgba(8, 13, 22, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }

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

  .nav-link {
    padding: 12px 10px;
    font-size: 15px;
  }

  .nav-link.is-active::after {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .header-actions .btn {
    display: none;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 36px, var(--max));
  }

  .section {
    padding: 64px 0;
  }

  .brand-divider,
  .brand-en {
    display: none;
  }

  .brand-mark {
    width: 28px;
    height: 28px;
  }

  .brand-cn-text {
    font-size: 14px;
  }

  .hero-copy h1,
  .product-hero h1 {
    font-size: clamp(34px, 10vw, 48px);
  }

  .lede {
    font-size: 16px;
  }

  .hero-status {
    gap: 8px 12px;
  }

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

  .steps {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .step {
    padding-right: 0;
  }

  .step::before {
    display: none;
  }

  .quick-facts {
    grid-template-columns: 1fr;
  }

  .quick-fact {
    border-right: 0;
    border-bottom: 1px solid var(--line-dark);
  }

  .quick-fact:last-child {
    border-bottom: 0;
  }

  .ui-body {
    grid-template-columns: 1fr;
  }

  .ui-side {
    display: none;
  }

  .ui-chart {
    padding: 8px;
  }

  .ui-modes .ui-tab:nth-child(3) {
    display: none;
  }

  .stage-copy {
    padding: 26px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .table-hint {
    display: block;
  }

  .stat-row {
    gap: 10px;
  }

  .stat {
    padding: 12px;
  }

  .stat .v {
    font-size: 16px;
    white-space: nowrap;
  }

  .hero-status .sep {
    display: none;
  }

  .diagram-scroll img {
    min-width: 720px;
    max-width: none;
  }

  .diagram-hint {
    display: block;
  }

  .hero-status {
    gap: 8px 16px;
  }

  .float-card {
    min-width: 112px;
    padding: 8px 10px;
  }

  .float-card--a {
    top: 4%;
    left: 2%;
  }

  .float-card--b {
    right: 2%;
    bottom: 5%;
  }
}

@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;
  }

  .reveal,
  .js .reveal {
    opacity: 1;
    transform: none;
  }
}

/* print */
@media print {
  .site-header,
  .hero-visual,
  .cta-band,
  .site-footer {
    display: none;
  }

  body {
    color: #000;
    background: #fff;
  }

  .section,
  .hero {
    padding: 20px 0;
  }

  .card,
  .app-card,
  .principle-item {
    box-shadow: none;
    border-color: #ccc;
    break-inside: avoid;
  }
}