:root {
  --bg-deep: #0b0f14;
  --bg-card: #121920;
  --bg-elevated: #1a222d;
  --border: rgba(120, 190, 200, 0.15);
  --text: #e8eef4;
  --muted: #8fa3b8;
  --accent: #3dd6c6;
  --accent-dim: #2a9d8f;
  --warn: #f4a261;
  --font-sans: "DM Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --radius: 12px;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.wrap {
  width: min(1120px, 92vw);
  margin-inline: auto;
}

header.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px);
  background: rgba(11, 15, 20, 0.85);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
  gap: 1rem;
}

.logo {
  font-weight: 700;
  letter-spacing: -0.03em;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
}
.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #2563eb);
  display: grid;
  place-items: center;
  font-size: 0.75rem;
  font-weight: 800;
  color: #041018;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  align-items: center;
}

nav a {
  color: var(--muted);
  font-size: 0.95rem;
}
nav a:hover {
  color: var(--text);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s;
}
.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  color: #041018;
}
.btn-primary:hover {
  filter: brightness(1.08);
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.hero {
  padding: 4.5rem 0 3.5rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -40% -20% auto;
  height: 70%;
  background: radial-gradient(ellipse at 50% 0%, rgba(61, 214, 198, 0.18), transparent 55%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}
@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.04em;
  margin: 0 0 1rem;
}

.lead {
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 36rem;
  margin: 0 0 1.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.badge {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--muted);
}

.hero-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.5;
  color: #b8c9d9;
}
.hero-panel .comment {
  color: #5c6f82;
}
.hero-panel .key {
  color: var(--accent);
}
.hero-panel .str {
  color: #a5d6ff;
}

section {
  padding: 3.5rem 0;
}

section:nth-child(even) {
  background: linear-gradient(180deg, rgba(26, 34, 45, 0.35), transparent);
}

.section-title {
  font-size: 1.75rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.03em;
}
.section-desc {
  color: var(--muted);
  max-width: 42rem;
  margin: 0 0 2rem;
}

.grid-3 {
  display: grid;
  gap: 1.25rem;
}
@media (min-width: 700px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem;
  height: 100%;
}
.card h3 {
  margin: 0 0 0.6rem;
  font-size: 1.1rem;
}
.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.arch-diagram {
  display: grid;
  gap: 1rem;
}
@media (min-width: 800px) {
  .arch-diagram {
    grid-template-columns: repeat(3, 1fr);
    align-items: stretch;
  }
}

.arch-box {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  background: var(--bg-elevated);
}
.arch-box h4 {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
  color: var(--accent);
}
.arch-box ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.flow {
  display: grid;
  gap: 1rem;
  counter-reset: step;
}
@media (min-width: 750px) {
  .flow {
    grid-template-columns: repeat(5, 1fr);
  }
}

.flow-step {
  position: relative;
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px dashed var(--border);
  background: rgba(18, 25, 32, 0.6);
}
.flow-step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: -10px;
  left: 12px;
  background: var(--bg-deep);
  border: 1px solid var(--accent);
  color: var(--accent);
  width: 26px;
  height: 26px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  display: grid;
  place-items: center;
}
.flow-step strong {
  display: block;
  margin-bottom: 0.35rem;
}
.flow-step span {
  font-size: 0.85rem;
  color: var(--muted);
}

.team-grid {
  display: grid;
  gap: 1.5rem;
}
@media (min-width: 800px) {
  .team-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.team-block {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-card);
}
.team-head {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.team-head h3 {
  margin: 0;
  font-size: 1.15rem;
}
.team-meta {
  font-size: 0.85rem;
  color: var(--warn);
  font-weight: 600;
}
.team-body {
  padding: 1rem 1.25rem 1.25rem;
}
.team-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}
.team-body th,
.team-body td {
  text-align: left;
  padding: 0.45rem 0.35rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.team-body th {
  color: var(--muted);
  font-weight: 500;
  width: 22%;
}
.role-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
}

.lifecycle {
  display: grid;
  gap: 0.75rem;
}
@media (min-width: 720px) {
  .lifecycle {
    grid-template-columns: repeat(3, 1fr);
  }
}
.lifecycle .card small {
  display: block;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.35rem;
  font-size: 0.8rem;
}

.cta {
  text-align: center;
  padding: 4rem 0 5rem;
}
.cta-box {
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  padding: 2.5rem 1.5rem;
  background: linear-gradient(145deg, rgba(61, 214, 198, 0.08), rgba(37, 99, 235, 0.06));
}
.cta h2 {
  margin: 0 0 0.75rem;
  font-size: 1.6rem;
}
.cta p {
  color: var(--muted);
  margin: 0 0 1.25rem;
}

footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.88rem;
}
.footer-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #041018;
}