/* ============ 基础 ============ */
:root {
  --bg: #0b0f17;
  --bg-soft: #0e1420;
  --surface: #101826;
  --surface-2: #151f30;
  --border: rgba(148, 163, 184, 0.14);
  --border-strong: rgba(148, 163, 184, 0.26);
  --text: #e6eaf2;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --cyan: #22d3ee;
  --violet: #818cf8;
  --orange: #fb923c;
  --emerald: #34d399;

  --gradient: linear-gradient(100deg, var(--cyan), var(--violet));
  --radius: 14px;
  --container: 1120px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; }

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

.container {
  width: min(var(--container), 92vw);
  margin: 0 auto;
}

/* ============ 导航 ============ */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(11, 15, 23, 0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.logo-icon { width: 22px; height: 22px; color: var(--cyan); }

.accent {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-links {
  display: flex;
  gap: 28px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.nav-links a { transition: color 0.2s ease; }
.nav-links a:hover { color: var(--text); }

.nav-actions { display: flex; align-items: center; gap: 12px; }

.lang-toggle {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 4px 10px;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.lang-toggle:hover { color: var(--text); border-color: var(--cyan); }

.nav-cta {
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 10px;
  background: var(--gradient);
  color: #0b0f17;
  transition: filter 0.2s ease, transform 0.2s ease;
}

.nav-cta:hover { filter: brightness(1.1); transform: translateY(-1px); }

/* ============ Hero ============ */
.hero {
  position: relative;
  padding: 160px 0 90px;
  overflow: hidden;
}

.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(110px);
  opacity: 0.16;
  pointer-events: none;
}

.bg-glow-a { width: 560px; height: 560px; background: var(--cyan); top: -180px; left: -120px; }
.bg-glow-b { width: 520px; height: 520px; background: var(--violet); top: -60px; right: -160px; }

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
  pointer-events: none;
}

.hero-inner { position: relative; text-align: center; }

.hero-title {
  margin: 0 0 20px;
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-subtitle {
  max-width: 640px;
  margin: 0 auto 36px;
  color: var(--text-muted);
  font-size: 1.1rem;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 26px;
  border-radius: 12px;
  transition: transform 0.2s ease, filter 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background: var(--gradient);
  color: #0b0f17;
}

.btn-primary:hover { transform: translateY(-2px); filter: brightness(1.08); }

.btn-ghost {
  border: 1px solid var(--border-strong);
  color: var(--text);
}

.btn-ghost:hover { transform: translateY(-2px); border-color: var(--cyan); }

/* 终端窗口 */
.terminal {
  max-width: 640px;
  margin: 56px auto 0;
  text-align: left;
  background: rgba(10, 14, 22, 0.92);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.5), 0 0 60px rgba(34, 211, 238, 0.07);
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  background: rgba(21, 31, 48, 0.8);
  border-bottom: 1px solid var(--border);
}

.tl { width: 11px; height: 11px; border-radius: 50%; }
.tl.red { background: #ff5f57; }
.tl.yellow { background: #febc2e; }
.tl.green { background: #28c840; }

.terminal-title {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

.terminal-body {
  margin: 0;
  padding: 20px 22px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.9;
  overflow-x: auto;
  color: var(--text);
}

.t-prompt { color: var(--emerald); }
.t-ok { color: var(--emerald); }
.t-dim { color: var(--text-dim); }
.t-cursor {
  display: inline-block;
  width: 8px;
  height: 15px;
  margin-left: 2px;
  vertical-align: -2px;
  background: var(--cyan);
  animation: blink 1.1s steps(1) infinite;
}

@keyframes blink { 50% { opacity: 0; } }

/* ============ 通用 Section ============ */
.section { padding: 96px 0; }

.section-head { text-align: center; max-width: 660px; margin: 0 auto 56px; }

.section-kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.section-title {
  margin: 0 0 16px;
  font-size: clamp(1.7rem, 3.6vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.section-subtitle { margin: 0; color: var(--text-muted); }

/* ============ 产品卡片 ============ */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.product-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 26px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--card-accent, var(--gradient));
  opacity: 0;
  transition: opacity 0.25s ease;
}

.product-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.35);
}

.product-card:hover::before { opacity: 1; }

.accent-cyan { --icon-color: var(--cyan); --card-accent: linear-gradient(90deg, #22d3ee, #67e8f9); }
.accent-blue { --icon-color: #60a5fa; --card-accent: linear-gradient(90deg, #3B82F6, #60a5fa); }
.accent-violet { --icon-color: var(--violet); --card-accent: linear-gradient(90deg, #7C3AED, #a78bfa); }
.accent-orange { --icon-color: var(--orange); --card-accent: linear-gradient(90deg, #F97316, #fdba74); }
.accent-red { --icon-color: #f87171; --card-accent: linear-gradient(90deg, #EF4444, #fca5a5); }
.accent-emerald { --icon-color: var(--emerald); --card-accent: linear-gradient(90deg, #10B981, #6ee7b7); }

.product-logo {
  width: 52px;
  height: 52px;
  margin-bottom: 18px;
  border-radius: 12px;
}

.product-head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.product-name { margin: 0; font-size: 1.2rem; font-weight: 700; letter-spacing: -0.01em; }

.product-tagline { margin: 0 0 16px; color: var(--text-muted); font-size: 0.94rem; }

.product-features {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-grow: 1;
}

.product-features li { display: flex; gap: 8px; align-items: baseline; }
.product-features li::before {
  content: "✓";
  color: var(--icon-color, var(--cyan));
  font-size: 0.8rem;
  flex-shrink: 0;
}

.product-tags { display: flex; gap: 8px; align-items: center; }

.product-site {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--icon-color, var(--cyan));
  transition: filter 0.2s ease;
}

.product-site:hover { filter: brightness(1.3); }

.chip {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 11px;
}

/* ============ 关于 ============ */
.brand { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.value-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.value-card:hover { transform: translateY(-4px); border-color: var(--border-strong); }

.value-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  background: color-mix(in srgb, var(--icon-color) 14%, transparent);
  color: var(--icon-color);
}

.value-icon svg { width: 21px; height: 21px; }
.value-card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.value-card p { margin: 0; color: var(--text-muted); font-size: 0.9rem; }

/* ============ CTA ============ */
.cta-band { padding: 110px 0; }

.cta-inner { text-align: center; }

.cta-inner h2 {
  margin: 0 0 12px;
  font-size: clamp(1.7rem, 3.6vw, 2.3rem);
  font-weight: 700;
}

.cta-inner p { margin: 0 0 28px; color: var(--text-muted); }

/* ============ 页脚 ============ */
.footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 40px;
  background: var(--bg-soft);
}

.footer-inner { text-align: center; }

.footer-tagline { margin: 10px 0 20px; color: var(--text-dim); font-size: 0.9rem; }

.footer-links {
  display: flex;
  justify-content: center;
  gap: 26px;
  flex-wrap: wrap;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 22px;
}

.footer-links a:hover { color: var(--text); }

.footer-copy { margin: 0; color: var(--text-dim); font-size: 0.82rem; }

.footer-copy .domain { color: var(--text-muted); }
.footer-copy .domain:hover { color: var(--cyan); }

/* ============ 入场动画 ============ */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

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

/* ============ 响应式 ============ */
@media (max-width: 960px) {
  .product-grid, .value-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 700px) {
  .nav-links { display: none; }
  .product-grid, .value-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 130px; }
  .section { padding: 72px 0; }
}

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