/* ===== Verstro 官网样式 — 纯静态、零外部依赖、PC/移动双端响应式 ===== */

:root {
  /* 深靛蓝深空 */
  --bg-0: #0B1726;
  --bg-1: #0F2032;
  --bg-2: #16293F;
  /* 青色信号 */
  --cyan: #2DD4BF;
  --cyan-bright: #7DF2DE;
  --cyan-deep: #10A696;
  /* 文字 */
  --ink: #EAF1F8;
  --ink-dim: #9FB2C8;
  --ink-faint: #69809B;
  /* 面 / 线 */
  --panel: rgba(255, 255, 255, 0.035);
  --panel-hi: rgba(255, 255, 255, 0.06);
  --line: rgba(125, 242, 222, 0.14);
  --line-soft: rgba(255, 255, 255, 0.08);

  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Segoe UI", system-ui, "Helvetica Neue", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --maxw: 1120px;
  --pad: clamp(20px, 5vw, 56px);
  --radius: 16px;
}

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

html, body {
  margin: 0;
  max-width: 100%;
  overflow-x: hidden;            /* 双重保险：杜绝移动端横向滚动 */
}

body {
  font-family: var(--font-sans);
  background: var(--bg-0);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }

/* ---------- 背景装饰 ---------- */
.backdrop { position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden;
  background:
    radial-gradient(120% 80% at 50% -10%, var(--bg-2) 0%, var(--bg-1) 38%, var(--bg-0) 100%);
}
.grid-dots {
  position: absolute; inset: -2px;
  background-image: radial-gradient(circle, rgba(125, 242, 222, 0.08) 1px, transparent 1.4px);
  background-size: 34px 34px;
  -webkit-mask-image: radial-gradient(120% 70% at 50% 0%, #000 0%, transparent 72%);
          mask-image: radial-gradient(120% 70% at 50% 0%, #000 0%, transparent 72%);
}
.glow { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; }
.glow-a { width: 50vw; height: 50vw; max-width: 620px; max-height: 620px;
  top: -160px; right: -120px; background: radial-gradient(circle, rgba(45,212,191,.34), transparent 68%); }
.glow-b { width: 46vw; height: 46vw; max-width: 540px; max-height: 540px;
  top: 38%; left: -160px; background: radial-gradient(circle, rgba(43,77,114,.55), transparent 70%); }

/* ---------- 容器 ---------- */
main, .site-footer { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad); }
main { padding-bottom: 24px; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  width: 100%;
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
  /* 背景/边框通栏到屏幕边缘；内容左右缘与正文(main)对齐 */
  padding-inline: max(var(--pad), calc((100% - var(--maxw)) / 2 + var(--pad)));
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  background: linear-gradient(var(--bg-0), rgba(11,23,38,.55));
  border-bottom: 1px solid var(--line-soft);
}
.brand { display: inline-flex; align-items: center; gap: 11px; }
.brand-logo { border-radius: 9px; box-shadow: 0 4px 16px rgba(0,0,0,.4); }
.brand-name { font-weight: 800; font-size: 1.18rem; letter-spacing: .02em; }
.nav-links { display: flex; align-items: center; gap: clamp(14px, 3vw, 30px); }
.nav-links > a { color: var(--ink-dim); font-size: .95rem; transition: color .2s; }
.nav-links > a:hover { color: var(--ink); }
.nav-cta {
  color: var(--bg-0) !important; font-weight: 700;
  background: linear-gradient(135deg, var(--cyan-bright), var(--cyan-deep));
  padding: 8px 16px; border-radius: 999px;
  box-shadow: 0 6px 18px rgba(16,166,150,.35);
}

/* ---------- 通用按钮 ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 26px; border-radius: 999px; font-weight: 700; font-size: 1rem;
  border: 1px solid transparent; transition: transform .2s, box-shadow .2s, background .2s, border-color .2s; }
.btn-primary { color: var(--bg-0);
  background: linear-gradient(135deg, var(--cyan-bright), var(--cyan-deep));
  box-shadow: 0 10px 30px rgba(16,166,150,.4); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 38px rgba(16,166,150,.5); }
.btn-ghost { color: var(--ink); border-color: var(--line); background: var(--panel); }
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan-bright); }

/* ---------- HERO ---------- */
.hero { padding: clamp(56px, 11vw, 120px) 0 clamp(40px, 8vw, 72px); max-width: 820px; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: .82rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--cyan-bright); margin: 0 0 22px;
  padding: 6px 14px; border: 1px solid var(--line); border-radius: 999px; background: var(--panel); }
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan);
  box-shadow: 0 0 0 0 rgba(45,212,191,.6); animation: pulse 2.4s ease-out infinite; }
.hero-title { font-size: clamp(2.5rem, 7.5vw, 4.6rem); line-height: 1.05; font-weight: 800;
  letter-spacing: -.01em; margin: 0 0 22px; }
.hero-title .accent { background: linear-gradient(120deg, var(--cyan-bright), var(--cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { font-size: clamp(1.02rem, 2.4vw, 1.22rem); color: var(--ink-dim); max-width: 600px; margin: 0 0 32px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 30px; }
.chips { list-style: none; display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 0; }
.chips li { font-family: var(--font-mono); font-size: .8rem; color: var(--ink-dim);
  padding: 6px 13px; border: 1px solid var(--line-soft); border-radius: 8px; background: var(--panel); }
.chips li::before { content: "// "; color: var(--cyan-deep); }

/* ---------- 区块标题 ---------- */
.section-head { max-width: 640px; margin: 0 0 clamp(28px, 5vw, 48px); }
.section-kicker { font-family: var(--font-mono); font-size: .82rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--cyan); margin: 0 0 10px; }
.section-title { font-size: clamp(1.8rem, 4.5vw, 2.7rem); font-weight: 800; line-height: 1.15; margin: 0; letter-spacing: -.01em; }
.section-desc { color: var(--ink-dim); margin: 16px 0 0; font-size: 1.02rem; }
.section-desc a { color: var(--cyan-bright); border-bottom: 1px solid var(--line); }
.section-desc a:hover { border-color: var(--cyan); }

/* ---------- FEATURES ---------- */
.features { padding: clamp(40px, 8vw, 80px) 0; }
.feature-grid { display: grid; gap: 18px; grid-template-columns: 1fr; }
.card { position: relative; padding: 28px 26px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--line-soft); overflow: hidden;
  transition: transform .25s, border-color .25s, background .25s; }
.card::after { content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: radial-gradient(120% 80% at 0% 0%, rgba(45,212,191,.08), transparent 55%); opacity: 0; transition: opacity .25s; }
.card:hover { transform: translateY(-4px); border-color: var(--line); background: var(--panel-hi); }
.card:hover::after { opacity: 1; }
.card-idx { font-family: var(--font-mono); font-size: .85rem; color: var(--cyan-deep); letter-spacing: .05em; }
.card h3 { font-size: 1.22rem; font-weight: 700; margin: 10px 0 10px; }
.card p { color: var(--ink-dim); margin: 0; font-size: .98rem; }

/* ---------- DOWNLOAD ---------- */
.download { padding: clamp(40px, 8vw, 80px) 0; }
.platform-grid { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; grid-template-columns: 1fr; }
.platform { display: flex; flex-direction: column; align-items: center; text-align: center;
  gap: 12px; padding: 26px 18px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--line-soft); position: relative; }
.platform-ic { width: 42px; height: 42px; color: var(--ink-dim); flex: none; }
.platform-meta { display: flex; flex-direction: column; gap: 2px; }
.platform-name { font-weight: 700; font-size: 1.08rem; color: var(--ink); }
.platform-sub { font-family: var(--font-mono); font-size: .76rem; color: var(--ink-faint); }
.badge { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .04em;
  color: var(--cyan-bright); padding: 4px 10px; border: 1px solid var(--line); border-radius: 999px;
  background: rgba(45,212,191,.06); }
.dl-btn { width: 100%; max-width: 200px; margin-top: 4px; padding: 11px 16px; border-radius: 10px;
  font-family: var(--font-sans); font-size: .95rem; font-weight: 600;
  color: var(--ink-faint); background: rgba(255,255,255,.04);
  border: 1px solid var(--line-soft); cursor: not-allowed; }
/* 置灰态：整卡降饱和，明确"未就绪" */
.platform[data-state="soon"] { opacity: .82; }
.platform[data-state="soon"] .platform-ic { color: var(--ink-faint); opacity: .65; }
/* 就绪态：可下载 */
.platform[data-state="ready"] { opacity: 1; border-color: var(--line); }
.platform[data-state="ready"] .platform-ic { color: var(--cyan-bright); }
.badge-ready { color: var(--bg-0) !important; background: linear-gradient(135deg, var(--cyan-bright), var(--cyan-deep)); border-color: transparent !important; }
.dl-ready { color: var(--bg-0) !important; background: linear-gradient(135deg, var(--cyan-bright), var(--cyan-deep)) !important; border-color: transparent !important; cursor: pointer !important; font-weight: 700; box-shadow: 0 6px 18px rgba(16,166,150,.34); transition: transform .2s, box-shadow .2s; }
.dl-ready:hover { transform: translateY(-1px); box-shadow: 0 10px 26px rgba(16,166,150,.52); }
.dl-alt { font-family: var(--font-mono); font-size: .74rem; color: var(--ink-faint); margin-top: 2px; line-height: 1.7; }
.dl-alt a { color: var(--cyan); font-weight: 600; border-bottom: 1px solid var(--cyan-deep); padding-bottom: 1px; }
.dl-alt a:hover { color: var(--cyan-bright); border-color: var(--cyan-bright); }
.download-note { margin: 26px 0 0; font-size: .88rem; color: var(--ink-faint); font-family: var(--font-mono); }

/* ---------- 页脚 ---------- */
.site-footer { padding: 40px var(--pad) 56px; margin-top: 32px;
  border-top: 1px solid var(--line-soft);
  display: flex; flex-wrap: wrap; align-items: center; gap: 18px 32px; }
.footer-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .02em; }
.footer-brand img { border-radius: 8px; }
.footer-contact { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-left: auto; }
.footer-contact a { color: var(--ink-dim); font-size: .92rem; transition: color .2s; }
.footer-contact a:hover { color: var(--cyan-bright); }
.footer-copy { width: 100%; margin: 4px 0 0; color: var(--ink-faint); font-size: .85rem; }

/* ---------- 入场动效（staggered） ---------- */
@keyframes fade-up { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(45,212,191,.55); } 70%,100% { box-shadow: 0 0 0 9px rgba(45,212,191,0); } }
.hero > * { animation: fade-up .7s both; }
.hero .eyebrow { animation-delay: .05s; }
.hero-title { animation-delay: .14s; }
.hero-sub { animation-delay: .24s; }
.hero-actions { animation-delay: .34s; }
.chips { animation-delay: .44s; }

/* ---------- 响应式：平板 ---------- */
@media (min-width: 560px) {
  .platform-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 720px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .platform-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- 响应式：桌面 ---------- */
@media (min-width: 1000px) {
  .feature-grid { grid-template-columns: repeat(4, 1fr); }
  .platform-grid { grid-template-columns: repeat(5, 1fr); }
}

/* ---------- 小屏导航精简 ---------- */
@media (max-width: 479px) {
  .nav-links a:not(.nav-cta) { display: none; }   /* 只保留 CTA，避免拥挤 */
  .site-footer { flex-direction: column; align-items: flex-start; }
  .footer-contact { margin-left: 0; }
}

/* ---------- 可访问性：尊重减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* 键盘焦点可见 */
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }