/* ============================================================
   无雅出品 · 三角洲雷达 官网样式
   极客暗色 + 雷达科技感
   ============================================================ */

:root {
  /* 主色系 */
  --bg-0: #05080d;
  --bg-1: #0a0f18;
  --bg-2: #0e1622;
  --panel: rgba(16, 26, 40, 0.72);
  --line: rgba(0, 255, 200, 0.16);
  --line-strong: rgba(0, 255, 200, 0.38);

  /* 霓虹色 */
  --cyan: #00ffc8;
  --blue: #00e5ff;
  --amber: #ffb300;
  --red: #ff4d5e;

  --text-0: #eaf6f2;
  --text-1: #9fb8b0;
  --text-2: #5f7a72;

  --font-mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Code", Consolas, "Courier New", monospace;
  --font-sans: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background:
    radial-gradient(1200px 800px at 70% -10%, rgba(0, 229, 255, 0.06), transparent 60%),
    radial-gradient(1000px 700px at 10% 110%, rgba(0, 255, 200, 0.05), transparent 55%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1));
  color: var(--text-0);
  font-family: var(--font-sans);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* 全局网格背景 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 255, 200, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 200, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 20%, black 20%, transparent 75%);
  z-index: 0;
}

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

::selection { background: rgba(0, 255, 200, 0.28); }

/* 顶部导航 */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 5vw;
  backdrop-filter: blur(14px);
  background: rgba(5, 8, 13, 0.7);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-0);
}
.brand:hover { text-decoration: none; }
.brand .logo {
  width: 30px; height: 30px;
  border-radius: 8px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(0,255,200,0.18), rgba(0,229,255,0.12));
  border: 1px solid var(--line-strong);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 15px;
  box-shadow: 0 0 18px rgba(0,255,200,0.25);
}
.brand small { color: var(--text-2); font-weight: 400; font-size: 12px; }

.nav-links { display: flex; gap: 26px; align-items: center; }
.nav-links a {
  color: var(--text-1);
  font-size: 14px;
  position: relative;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--cyan); text-decoration: none; }
.nav-links a.active { color: var(--cyan); }
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}

.nav-cta {
  padding: 8px 18px;
  border-radius: 8px;
  border: 1px solid var(--cyan);
  color: var(--bg-0) !important;
  background: var(--cyan);
  font-weight: 700;
  box-shadow: 0 0 20px rgba(0,255,200,0.3);
  transition: all 0.2s;
}
.nav-cta:hover { background: #33ffd6; box-shadow: 0 0 30px rgba(0,255,200,0.5); }

/* 页面容器 */
.page { position: relative; z-index: 1; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 5vw; }

/* 英雄区 */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding: 9vh 5vw 7vh;
  min-height: 82vh;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--cyan);
  text-transform: uppercase;
}
.eyebrow .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
  animation: pulse 2s infinite;
}
@keyframes pulse { 50% { opacity: 0.4; } }

.hero h1 {
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: -1px;
  margin: 20px 0 8px;
}
.hero h1 .glow {
  background: linear-gradient(90deg, var(--cyan), var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: none;
  filter: drop-shadow(0 0 24px rgba(0,255,200,0.35));
}
.hero .subtitle {
  font-size: 20px;
  color: var(--text-1);
  margin-bottom: 22px;
}
.hero .desc { color: var(--text-1); max-width: 540px; }

.cta-row { display: flex; gap: 16px; margin-top: 34px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 14px 28px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 15px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-primary {
  background: var(--cyan);
  color: var(--bg-0);
  box-shadow: 0 0 30px rgba(0,255,200,0.35);
}
.btn-primary:hover { background: #33ffd6; transform: translateY(-2px); box-shadow: 0 8px 40px rgba(0,255,200,0.5); text-decoration: none; }
.btn-ghost {
  background: transparent;
  color: var(--text-0);
  border-color: var(--line-strong);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); transform: translateY(-2px); text-decoration: none; }

/* 雷达动画容器 */
.radar-stage {
  position: relative;
  aspect-ratio: 1;
  max-width: 520px;
  margin: 0 auto;
  width: 100%;
}
.radar-stage canvas { width: 100%; height: 100%; display: block; }

/* 徽章行 */
.hero-meta {
  display: flex;
  gap: 36px;
  margin-top: 40px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-2);
}
.hero-meta b { color: var(--cyan); font-weight: 600; }

/* 通用 section */
.section { padding: 90px 0; }
.section-head { margin-bottom: 48px; }
.section-head h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  letter-spacing: -0.5px;
}
.section-head p { color: var(--text-1); margin-top: 10px; max-width: 640px; }
.section-head .tag {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: 2px;
}

/* 特性网格 */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px 26px;
  position: relative;
  overflow: hidden;
  transition: all 0.25s;
  backdrop-filter: blur(6px);
}
.card:hover {
  border-color: var(--line-strong);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.4), 0 0 0 1px var(--line-strong) inset;
}
.card .icon {
  font-family: var(--font-mono);
  font-size: 26px;
  color: var(--cyan);
  margin-bottom: 16px;
  display: block;
}
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { color: var(--text-1); font-size: 14.5px; }
.card .idx {
  position: absolute;
  top: 20px; right: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-2);
}

/* 特性列表行 */
.spec-list { list-style: none; }
.spec-list li {
  display: flex;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  align-items: flex-start;
}
.spec-list li:last-child { border-bottom: none; }
.spec-list .k {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 14px;
  min-width: 120px;
}
.spec-list .v { color: var(--text-1); font-size: 14.5px; }

/* 下载页 */
.download-hero { padding: 70px 0 40px; text-align: center; }
.download-hero h1 { font-size: clamp(34px, 5vw, 54px); font-weight: 800; }
.download-hero p { color: var(--text-1); margin-top: 12px; }

.version-card {
  max-width: 720px;
  margin: 40px auto;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: 18px;
  padding: 36px;
  position: relative;
}
.version-card .ver { font-family: var(--font-mono); color: var(--cyan); font-size: 15px; }
.version-card h2 { font-size: 26px; margin: 8px 0 4px; }
.version-card .meta { color: var(--text-2); font-size: 13px; margin-bottom: 24px; }

.dl-btn {
  display: block;
  width: 100%;
  text-align: center;
  padding: 18px;
  border-radius: 12px;
  background: linear-gradient(90deg, var(--cyan), var(--blue));
  color: var(--bg-0);
  font-weight: 800;
  font-size: 17px;
  transition: all 0.2s;
}
.dl-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 36px rgba(0,229,255,0.4); text-decoration: none; }

.dl-alt {
  margin-top: 16px;
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-2);
}
.dl-alt a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px dotted rgba(0,229,255,0.4);
  transition: color 0.15s;
}
.dl-alt a:hover { color: #fff; }

.parts-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.part {
  padding: 7px 11px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--text-1);
  font-family: var(--font-mono);
  font-size: 12px;
  text-decoration: none;
  transition: all 0.15s;
}
.part:hover { border-color: var(--cyan); color: var(--cyan); text-decoration: none; }
.part-hint {
  margin-top: 20px;
  margin-bottom: 0;
  color: var(--text-2);
  font-size: 12px;
  word-break: break-all;
}
.part-hint code {
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
}

.dl-tip {
  margin-top: 16px;
  margin-bottom: 0;
  color: var(--text-2);
  font-size: 12.5px;
  text-align: center;
  word-break: break-all;
}
.dl-tip code { color: var(--cyan); font-family: var(--font-mono); font-size: 11px; }
.manual-dl { margin-top: 18px; text-align: left; }
.manual-dl summary {
  cursor: pointer;
  color: var(--text-1);
  font-size: 13px;
  margin-bottom: 12px;
  user-select: none;
}
.manual-dl .parts-grid { margin-top: 6px; }
.mini-btn {
  display: inline-block;
  margin-top: 14px;
  padding: 8px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--cyan);
  font-size: 13px;
  text-decoration: none;
}
.mini-btn:hover { border-color: var(--cyan); text-decoration: none; }

/* 需求表格 */
.req-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}
.req-item { background: rgba(0,0,0,0.3); border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.req-item .k { font-family: var(--font-mono); font-size: 12px; color: var(--text-2); text-transform: uppercase; letter-spacing: 1px; }
.req-item .v { margin-top: 8px; font-size: 15px; color: var(--text-0); }

/* 更新日志 */
.changelog { max-width: 720px; margin: 0 auto; }
.changelog .item { display: flex; gap: 20px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.changelog .date { font-family: var(--font-mono); color: var(--cyan); min-width: 110px; font-size: 13px; }
.changelog h4 { font-size: 16px; margin-bottom: 6px; }
.changelog p { color: var(--text-1); font-size: 14px; }

/* 指南页 */
.guide-body { max-width: 760px; }
.step {
  display: flex;
  gap: 22px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}
.step .n {
  font-family: var(--font-mono);
  font-size: 26px;
  color: var(--cyan);
  font-weight: 700;
  min-width: 52px;
  text-shadow: 0 0 16px rgba(0,255,200,0.5);
}
.step h3 { font-size: 19px; margin-bottom: 8px; }
.step p { color: var(--text-1); }
.step code {
  font-family: var(--font-mono);
  background: rgba(0,255,200,0.08);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px 8px;
  font-size: 13px;
  color: var(--cyan);
}

.faq { max-width: 760px; }
.faq .q { padding: 22px 0; border-bottom: 1px solid var(--line); }
.faq .q h4 { font-size: 16px; margin-bottom: 8px; color: var(--text-0); }
.faq .q p { color: var(--text-1); font-size: 14.5px; }

/* 页脚 */
.footer {
  border-top: 1px solid var(--line);
  padding: 40px 5vw;
  margin-top: 60px;
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--text-2);
}
.footer .brand-mark { color: var(--text-0); font-weight: 700; }

/* 响应式 */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 5vh; }
  .radar-stage { order: -1; max-width: 320px; }
  .features { grid-template-columns: 1fr; }
  .req-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 16px; }
  .nav-links a:not(.nav-cta) { display: none; }
}