:root {
  --bg: #0f172a;
  --bg-alt: #111827;
  --surface: #111827;
  --surface-alt: #020617;
  --border-subtle: rgba(148, 163, 184, 0.35);
  --text-main: #e5e7eb;
  --text-muted: #9ca3af;
  --accent: #f97316; /* 暖橙色，避免蓝紫 */
  --accent-soft: #facc15;
  --radius-lg: 18px;
  --radius-md: 14px;
  --radius-pill: 999px;
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.6);
  --shadow-subtle: 0 10px 30px rgba(15, 23, 42, 0.9);
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #0b1120 0, #020617 55%, #000 100%);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(16px);
  background: linear-gradient(
      to bottom,
      rgba(15, 23, 42, 0.96),
      rgba(15, 23, 42, 0.85),
      transparent
    );
  border-bottom: 1px solid rgba(148, 163, 184, 0.35);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: #020617;
  border: 1px solid rgba(248, 250, 252, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  color: var(--accent-soft);
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.5), var(--shadow-subtle);
}

.logo-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logo-title {
  font-size: 15px;
  font-weight: 600;
}

.logo-subtitle {
  font-size: 11px;
  color: var(--text-muted);
}

.nav {
  display: flex;
  gap: 18px;
  font-size: 13px;
}

.nav a {
  position: relative;
  padding: 4px 2px;
  color: var(--text-muted);
  transition: color 0.18s ease;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background-color: var(--accent);
  transition: width 0.18s ease;
}

.nav a:hover {
  color: var(--text-main);
}

.nav a:hover::after {
  width: 100%;
}

/* Hero */
.hero {
  padding: 54px 0 40px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 40px;
  align-items: center;
}

.hero-copy {
  max-width: 520px;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.45);
  color: var(--accent-soft);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-kicker::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background-color: var(--accent);
  box-shadow: 0 0 8px rgba(248, 113, 22, 0.7);
}

.hero h1 {
  margin: 16px 0 10px;
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.hero-lead {
  margin: 0 0 22px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 13px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease,
    transform 0.1s ease, box-shadow 0.18s ease;
}

.btn-primary {
  background-color: var(--accent);
  color: #0b0f19;
  box-shadow: 0 15px 35px rgba(248, 113, 22, 0.4);
}

.btn-primary:hover {
  background-color: #ea580c;
  transform: translateY(-1px);
  box-shadow: 0 18px 45px rgba(248, 113, 22, 0.55);
}

.btn-ghost {
  background: rgba(15, 23, 42, 0.9);
  border-color: rgba(148, 163, 184, 0.6);
  color: var(--text-main);
}

.btn-ghost:hover {
  border-color: rgba(248, 250, 252, 0.8);
  background: rgba(15, 23, 42, 0.95);
}

.hero-meta {
  font-size: 12px;
  color: var(--text-muted);
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.device-mock {
  width: 100%;
  max-width: 380px;
  padding: 18px 18px 22px;
  border-radius: 32px;
  background: radial-gradient(circle at top, #0f172a 0, #020617 52%, #000 100%);
  border: 1px solid rgba(148, 163, 184, 0.4);
  box-shadow: var(--shadow-soft);
}

.device-screen {
  position: relative;
  border-radius: 22px;
  background: #020617;
  border: 1px solid rgba(148, 163, 184, 0.6);
  padding: 22px 20px 26px;
  overflow: hidden;
}

.screen-layer {
  position: relative;
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  padding: 10px 12px;
  font-size: 13px;
  color: var(--text-main);
  backdrop-filter: blur(10px);
  background: rgba(15, 23, 42, 0.9);
}

.screen-main {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.screen-main span {
  font-size: 11px;
  color: var(--accent-soft);
}

.screen-side {
  position: absolute;
  right: 14px;
  top: 26px;
  padding: 8px 12px;
  font-size: 11px;
}

.screen-bottom {
  position: absolute;
  left: 14px;
  bottom: 24px;
  padding: 8px 12px;
  font-size: 11px;
}

.device-caption {
  margin-top: 14px;
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
}

/* Sections */
.section {
  padding: 40px 0;
}

.section-alt {
  background: radial-gradient(circle at top, #020617 0, #020617 55%, #000 100%);
}

.section-header {
  max-width: 620px;
  margin: 0 auto 24px;
  text-align: center;
}

.section-header h2 {
  margin: 0 0 8px;
  font-size: 22px;
}

.section-header p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
}

.grid {
  display: grid;
  gap: 18px;
}

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

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

.card {
  padding: 16px 18px 18px;
  border-radius: var(--radius-md);
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-subtle);
}

.card-em {
  border-color: rgba(248, 113, 22, 0.6);
  box-shadow: 0 20px 50px rgba(248, 113, 22, 0.35);
}

.card h3 {
  margin: 0 0 10px;
  font-size: 16px;
}

.card p {
  margin: 0 0 10px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.7;
}

.card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.7;
}

.bullet-small {
  margin-top: 6px;
}

.bullet-small li {
  margin-bottom: 2px;
}

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

.ip-card {
  padding: 16px 18px 18px;
  border-radius: var(--radius-md);
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-subtle);
}

.ip-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 11px;
  color: var(--accent-soft);
  background: rgba(30, 64, 175, 0.1);
  border: 1px solid rgba(248, 250, 252, 0.08);
  margin-bottom: 8px;
}

.ip-card h3 {
  margin: 0 0 6px;
  font-size: 15px;
}

.ip-card p {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Ecosystem visual */
.ecosystem-visual {
  max-width: 960px;
  margin: 0 auto 22px;
  text-align: center;
}

.ecosystem-visual img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
  background-color: #020617;
}

.ecosystem-visual figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

/* Team visual */
.team-visual {
  max-width: 960px;
  margin: 0 auto 24px;
  text-align: center;
}

.team-visual img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
  background-color: #f9fafb;
}

.team-visual figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

/* Users visual */
.users-visual {
  max-width: 1040px;
  margin: 0 auto 8px;
  text-align: center;
}

.users-visual img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
  background-color: #f9fafb;
}

.users-visual figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

/* Info list & stages */
.info-list {
  margin: 0;
}

.info-list div {
  margin-bottom: 8px;
}

.info-list dt {
  font-size: 12px;
  color: var(--text-muted);
}

.info-list dd {
  margin: 2px 0 0;
  font-size: 13px;
}

.stage-list {
  margin: 0;
  padding-left: 18px;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
}

.company-grid {
  margin-top: 6px;
}

/* Footer */
.site-footer {
  padding: 18px 0 26px;
  border-top: 1px solid rgba(148, 163, 184, 0.45);
  background: #020617;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}

.footer-sub {
  margin-top: 4px;
  font-size: 11px;
}

.footer-record {
  margin-top: 6px;
  font-size: 11px;
}

.footer-record a {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(148, 163, 184, 0.45);
  transition: color 0.18s ease, text-decoration-color 0.18s ease;
}

.footer-record a:hover {
  color: var(--text-main);
  text-decoration-color: rgba(248, 113, 22, 0.85);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    padding-top: 40px;
  }

  .hero-visual {
    order: -1;
  }

  .nav {
    display: none;
  }

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

  .section {
    padding: 32px 0;
  }
}

@media (max-width: 600px) {
  .header-inner {
    padding-inline: 14px;
  }

  .hero h1 {
    font-size: 26px;
  }

  .hero-lead {
    font-size: 13px;
  }

  .card,
  .ip-card {
    padding: 14px 14px 16px;
  }

  .device-mock {
    padding: 16px 14px 18px;
  }
}