:root {
  --bg: #0b0f1c;
  --bg-soft: #11162b;
  --text: #e8ecf6;
  --muted: #9aa6c4;
  --accent: #7c5cff;
  --accent-2: #2dd4bf;
  --card: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.08);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(11, 15, 28, 0.7);
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 800;
  font-size: 20px;
  letter-spacing: 0.5px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.brand__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 12px var(--accent);
}

.nav__links a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 26px;
  font-size: 15px;
  transition: color 0.2s;
}

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

/* ---------- Hero ---------- */
.hero {
  position: relative;
  max-width: 1080px;
  margin: 0 auto;
  padding: 120px 24px 90px;
  text-align: center;
  overflow: hidden;
}

.hero__blob {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124, 92, 255, 0.35), transparent 60%);
  filter: blur(40px);
  z-index: 0;
  animation: float 8s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-24px); }
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__title {
  font-size: clamp(38px, 7vw, 72px);
  font-weight: 900;
  line-height: 1.12;
}

.gradient {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__sub {
  max-width: 560px;
  margin: 22px auto 34px;
  font-size: 18px;
  color: var(--muted);
}

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

/* ---------- Buttons ---------- */
.btn {
  padding: 12px 26px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
  border: none;
}

.btn--primary {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #fff;
  box-shadow: 0 10px 30px rgba(124, 92, 255, 0.4);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(124, 92, 255, 0.55);
}

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

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--text);
}

/* ---------- Sections ---------- */
.section-title {
  text-align: center;
  font-size: 32px;
  margin-bottom: 40px;
}

.features {
  max-width: 1080px;
  margin: 0 auto;
  padding: 60px 24px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 30px;
  transition: transform 0.25s, border-color 0.25s;
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
}

.card__icon {
  font-size: 34px;
  margin-bottom: 14px;
}

.card h3 {
  font-size: 19px;
  margin-bottom: 8px;
}

.card p {
  color: var(--muted);
  font-size: 15px;
}

/* ---------- 共同开发者 ---------- */
.devs {
  max-width: 1080px;
  margin: 0 auto;
  padding: 60px 24px;
  text-align: center;
}

.devs__intro {
  color: var(--muted);
  max-width: 520px;
  margin: 0 auto 40px;
}

.devs__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 22px;
  max-width: 640px;
  margin: 0 auto;
}

.dev {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 34px 20px;
  transition: transform 0.25s, border-color 0.25s;
}

.dev:hover {
  transform: translateY(-6px);
  border-color: var(--accent-2);
}

.dev__avatar {
  width: 76px;
  height: 76px;
  margin: 0 auto 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 10px 26px rgba(124, 92, 255, 0.45);
}

.dev h3 {
  font-size: 20px;
  margin-bottom: 6px;
}

.dev__role {
  color: var(--muted);
  font-size: 14px;
}

/* ---------- CTA ---------- */
.cta {
  max-width: 1080px;
  margin: 0 auto;
  padding: 70px 24px;
  text-align: center;
}

.cta h2 {
  font-size: 32px;
  margin-bottom: 12px;
}

.cta p {
  color: var(--muted);
  margin-bottom: 26px;
}

.cta__count {
  display: block;
  margin-top: 20px;
  font-size: 15px;
  color: var(--accent-2);
  min-height: 1.4em;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}