/* ==========================================================================
   黑洞加速器 - 全局样式
   设计主题：深空黑洞（原创视觉语言，非模仿参考站点）
   ========================================================================== */

:root {
  /* 色板 */
  --bg: #05060d;
  --bg-alt: #090b16;
  --surface: rgba(18, 22, 41, 0.72);
  --surface-solid: #12162a;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #eef0fb;
  --text-dim: #a3aac8;
  --text-faint: #6b7290;
  --accent: #7c5cff;
  --accent-2: #3ee8d8;
  --accent-3: #ff5ca8;
  --warn: #ffb84d;
  --gradient: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  --gradient-soft: linear-gradient(135deg, rgba(124, 92, 255, 0.16), rgba(62, 232, 216, 0.12));
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-glow: 0 0 60px rgba(124, 92, 255, 0.25);
  --container: 1160px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
  position: relative;
}

/* 背景星空纹理（纯CSS，不依赖图片） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background-color: var(--bg);
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,0.55) 0%, transparent 60%),
    radial-gradient(1px 1px at 70% 60%, rgba(255,255,255,0.4) 0%, transparent 60%),
    radial-gradient(1.5px 1.5px at 40% 80%, rgba(255,255,255,0.5) 0%, transparent 60%),
    radial-gradient(1px 1px at 85% 15%, rgba(255,255,255,0.35) 0%, transparent 60%),
    radial-gradient(1.5px 1.5px at 55% 45%, rgba(255,255,255,0.45) 0%, transparent 60%),
    radial-gradient(1px 1px at 10% 65%, rgba(255,255,255,0.3) 0%, transparent 60%),
    radial-gradient(1px 1px at 92% 80%, rgba(255,255,255,0.4) 0%, transparent 60%);
  background-size: 100% 100%;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: radial-gradient(ellipse 60% 40% at 50% 0%, rgba(124, 92, 255, 0.14), transparent 70%);
  pointer-events: none;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 6, 13, 0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.brand img { width: 32px; height: 32px; }

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 0.95rem;
  color: var(--text-dim);
  transition: color .2s ease, background .2s ease;
}

.nav-links a:hover { color: var(--text); background: rgba(255,255,255,0.06); }
.nav-links a[aria-current="page"] {
  color: var(--text);
  background: rgba(124, 92, 255, 0.16);
}

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

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  align-items: center;
  justify-content: center;
}
.nav-toggle svg { width: 20px; height: 20px; }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform .18s ease, box-shadow .18s ease, opacity .18s ease, background .18s ease;
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--gradient);
  color: #05060d;
  box-shadow: 0 8px 24px rgba(124, 92, 255, 0.35);
}
.btn-primary:hover { box-shadow: 0 10px 30px rgba(124, 92, 255, 0.5); }

.btn-ghost {
  background: rgba(255,255,255,0.04);
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover { background: rgba(255,255,255,0.09); }

.btn-block { width: 100%; }
.btn-sm { padding: 9px 18px; font-size: 0.85rem; }
.btn[disabled], .btn.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
}

/* ---------------- Hero ---------------- */
.hero {
  position: relative;
  padding: 88px 0 96px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(62, 232, 216, 0.1);
  border: 1px solid rgba(62, 232, 216, 0.28);
  color: var(--accent-2);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 20px;
}
.eyebrow .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 8px var(--accent-2);
}

.hero h1 {
  font-size: clamp(2.1rem, 4vw, 3.2rem);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 20px;
}
.hero h1 .grad {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p.lead {
  font-size: 1.08rem;
  color: var(--text-dim);
  max-width: 540px;
  margin-bottom: 32px;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 36px; }

.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}
.hero-stats .stat b {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-stats .stat span { color: var(--text-faint); font-size: 0.85rem; }

/* 黑洞视觉 */
.blackhole-stage {
  position: relative;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.blackhole-stage canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.blackhole-core {
  position: relative;
  width: 38%;
  aspect-ratio: 1/1;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, #000 0%, #000 55%, rgba(0,0,0,0) 60%);
  box-shadow:
    0 0 0 2px rgba(124,92,255,0.25),
    0 0 40px 10px rgba(124,92,255,0.35),
    0 0 90px 30px rgba(62,232,216,0.18);
  z-index: 2;
}

.blackhole-ring {
  position: absolute;
  inset: -30%;
  border-radius: 50%;
  background: conic-gradient(from 0deg, transparent 0deg, rgba(124,92,255,0.55) 90deg, rgba(62,232,216,0.7) 180deg, transparent 270deg, transparent 360deg);
  filter: blur(2px);
  animation: spin 9s linear infinite;
  mask: radial-gradient(circle, transparent 34%, black 36%, black 55%, transparent 58%);
  -webkit-mask: radial-gradient(circle, transparent 34%, black 36%, black 55%, transparent 58%);
  z-index: 1;
}
.blackhole-ring.ring-2 {
  inset: -12%;
  animation-duration: 6s;
  animation-direction: reverse;
  opacity: 0.7;
  mask: radial-gradient(circle, transparent 40%, black 42%, black 50%, transparent 53%);
  -webkit-mask: radial-gradient(circle, transparent 40%, black 42%, black 50%, transparent 53%);
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ---------------- Section 通用 ---------------- */
.section { padding: 88px 0; position: relative; }
.section-alt { background: linear-gradient(180deg, transparent, rgba(255,255,255,0.02) 15%, rgba(255,255,255,0.02) 85%, transparent); }

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}
.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 14px;
}
.section-head p { color: var(--text-dim); }

.tag-pill {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 999px;
  background: rgba(124,92,255,0.12);
  border: 1px solid rgba(124,92,255,0.3);
  color: var(--accent-2);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 14px;
}

/* ---------------- 卡片网格 ---------------- */
.grid {
  display: grid;
  gap: 24px;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: 0 16px 40px rgba(0,0,0,0.35);
}

.feature-card .icon {
  width: 46px; height: 46px;
  border-radius: 12px;
  background: var(--gradient-soft);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.feature-card .icon svg { width: 24px; height: 24px; }
.feature-card h3 { font-size: 1.05rem; margin-bottom: 8px; font-weight: 700; }
.feature-card p { color: var(--text-dim); font-size: 0.92rem; }

/* ---------------- 价格卡片 ---------------- */
.pricing-toggle {
  display: flex;
  justify-content: center;
  gap: 4px;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px;
  width: fit-content;
  margin: 0 auto 48px;
}
.pricing-toggle button {
  border: none;
  background: transparent;
  color: var(--text-dim);
  padding: 10px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9rem;
}
.pricing-toggle button.active {
  background: var(--gradient);
  color: #05060d;
}

.price-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
}
.price-card.featured {
  border-color: rgba(124,92,255,0.5);
  box-shadow: var(--shadow-glow);
}
.price-card .badge-best {
  position: absolute;
  top: -14px; left: 50%;
  transform: translateX(-50%);
  background: var(--gradient);
  color: #05060d;
  padding: 5px 16px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 800;
}
.price-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; }
.price-card .desc { color: var(--text-faint); font-size: 0.85rem; margin-bottom: 20px; }
.price-card .price {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 4px;
}
.price-card .price b { font-size: 2.2rem; font-weight: 800; }
.price-card .price span { color: var(--text-faint); font-size: 0.9rem; }
.price-card .price-note { color: var(--text-faint); font-size: 0.8rem; margin-bottom: 24px; }
.price-card ul { display: flex; flex-direction: column; gap: 12px; margin-bottom: 28px; flex: 1; }
.price-card li { display: flex; gap: 10px; align-items: flex-start; font-size: 0.9rem; color: var(--text-dim); }
.price-card li svg { width: 18px; height: 18px; flex-shrink: 0; color: var(--accent-2); margin-top: 2px; }

.compare-table-wrap { overflow-x: auto; margin-top: 64px; }
table.compare {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  background: var(--surface);
  border-radius: var(--radius-md);
  overflow: hidden;
}
table.compare th, table.compare td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
table.compare thead th {
  color: var(--text-faint);
  font-weight: 700;
  background: rgba(255,255,255,0.03);
}
table.compare tbody tr:last-child td { border-bottom: none; }
table.compare td:first-child { color: var(--text-dim); }

/* ---------------- FAQ 手风琴 ---------------- */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-weight: 600;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item .chev { transition: transform .2s ease; flex-shrink: 0; color: var(--accent-2); }
.faq-item[open] .chev { transform: rotate(180deg); }
.faq-item .faq-a {
  padding: 0 24px 22px;
  color: var(--text-dim);
  font-size: 0.94rem;
}

/* ---------------- 下载平台卡片 ---------------- */
.platform-card {
  text-align: center;
  padding: 36px 24px;
}
.platform-card .icon {
  width: 56px; height: 56px;
  margin: 0 auto 18px;
  border-radius: 16px;
  background: var(--gradient-soft);
  display: flex; align-items: center; justify-content: center;
}
.platform-card .icon svg { width: 30px; height: 30px; }
.platform-card h3 { margin-bottom: 8px; }
.platform-card .status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--warn);
  background: rgba(255,184,77,0.12);
  border: 1px solid rgba(255,184,77,0.3);
  padding: 4px 12px;
  border-radius: 999px;
  margin: 12px 0 20px;
}

.notify-form {
  display: flex;
  gap: 10px;
  max-width: 420px;
  margin: 0 auto;
  flex-wrap: wrap;
}
.notify-form input {
  flex: 1;
  min-width: 200px;
  padding: 13px 18px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: rgba(255,255,255,0.04);
  color: var(--text);
  font-size: 0.92rem;
}
.notify-form input:focus { outline: 2px solid var(--accent); }
.form-note { text-align: center; color: var(--text-faint); font-size: 0.82rem; margin-top: 14px; }
.form-note.success { color: var(--accent-2); display: none; }
.form-note.success.show { display: block; }

/* ---------------- 步骤 / 教程 ---------------- */
.steps { display: flex; flex-direction: column; gap: 64px; }
.step-row {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
  align-items: center;
}
.step-row.reverse { direction: rtl; }
.step-row.reverse > * { direction: ltr; }
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--gradient);
  color: #05060d;
  font-weight: 800;
  margin-bottom: 18px;
}
.step-row h3 { font-size: 1.3rem; margin-bottom: 12px; font-weight: 700; }
.step-row p { color: var(--text-dim); }
.step-visual {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

/* ---------------- Coverage / 服务器覆盖 ---------------- */
.coverage-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 18px;
}
.coverage-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
}
.coverage-item .num { font-size: 1.4rem; font-weight: 800; color: var(--accent-2); }
.coverage-item .region { color: var(--text-dim); font-size: 0.85rem; margin-top: 4px; }

/* ---------------- CTA 区块 ---------------- */
.cta-banner {
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  background: var(--gradient-soft);
  border: 1px solid rgba(124,92,255,0.3);
  text-align: center;
}
.cta-banner h2 { font-size: 1.8rem; margin-bottom: 12px; font-weight: 800; }
.cta-banner p { color: var(--text-dim); margin-bottom: 28px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------------- Footer ---------------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
  background: var(--bg-alt);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}
.footer-brand p { color: var(--text-faint); font-size: 0.88rem; margin-top: 14px; max-width: 280px; }
.footer-col h4 { font-size: 0.92rem; margin-bottom: 16px; color: var(--text); }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { color: var(--text-faint); font-size: 0.88rem; }
.footer-col a:hover { color: var(--accent-2); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--text-faint);
  font-size: 0.8rem;
}
.social-links { display: flex; gap: 12px; }
.social-links a {
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
}
.social-links svg { width: 16px; height: 16px; color: var(--text-dim); }

/* ---------------- 关于页 ---------------- */
.about-block { max-width: 760px; margin: 0 auto 48px; }
.about-block h2 { font-size: 1.4rem; margin-bottom: 14px; font-weight: 700; }
.about-block p { color: var(--text-dim); margin-bottom: 14px; }
.about-block p:last-child { margin-bottom: 0; }

.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 20px; }

/* ---------------- 面包屑 ---------------- */
.breadcrumb {
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--text-faint);
  font-size: 0.85rem;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-faint); }
.breadcrumb a:hover { color: var(--accent-2); }
.page-hero { padding: 48px 0 16px; }
.page-hero h1 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); font-weight: 800; margin-bottom: 14px; }
.page-hero p { color: var(--text-dim); max-width: 640px; }

/* 动画：滚动淡入 */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; }
  .blackhole-stage { max-width: 360px; margin: 0 auto; }
  .grid-3, .grid-4, .grid-5 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .step-row, .step-row.reverse { grid-template-columns: 1fr; direction: ltr; }
  .value-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-bar.menu-open .nav-links {
    display: flex;
    position: absolute;
    top: 72px; left: 0; right: 0;
    flex-direction: column;
    background: rgba(5,6,13,0.98);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px 20px;
    gap: 4px;
  }
  .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .cta-banner { padding: 40px 24px; }
}