/*
 * TO6 技术栈门户 · 视觉样式（深色宏伟）
 * Author: 缘境 (yvsm@zunyunkeji.com)
 */
:root {
  --primary: #22D3EE;
  --primary-deep: #67E8F9;
  --secondary: #38BDF8;
  --accent: #22D3EE;
  --accent-dark: #0891B2;
  --bg: #020617;
  --bg-card: #0B1220;
  --text: #F1F5F9;
  --muted: #94A3B8;
  --border: #1E293B;
  --shadow: 0 18px 50px rgba(0, 0, 0, .45);
  --radius: 18px;
  --font-display: "Orbitron", "Segoe UI", "PingFang SC", sans-serif;
  --font-body: "IBM Plex Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", Consolas, monospace;
  --max: 1200px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(900px 480px at 70% -10%, rgba(34,211,238,.12), transparent 55%),
    radial-gradient(700px 400px at 0% 30%, rgba(14,165,233,.10), transparent 50%),
    linear-gradient(180deg, #020617 0%, #030712 100%);
  line-height: 1.65;
  overflow-x: clip;
}
a { color: var(--primary); text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(100% - 32px, var(--max)); margin-inline: auto; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(2,6,23,.86);
  border-bottom: 1px solid rgba(30,41,59,.95);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 72px;
}
.logo { text-decoration: none; }
.logo-mark {
  font-family: var(--font-display);
  font-weight: 700; font-size: 1.55rem; letter-spacing: .16em;
  color: #F8FAFC;
}
.main-nav { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 18px; }
.main-nav > a {
  color: var(--muted); font-size: .94rem; font-weight: 600; padding: 8px 2px;
  border-bottom: 2px solid transparent;
}
.main-nav > a:hover, .main-nav > a.active {
  color: #F8FAFC; border-bottom-color: var(--primary);
}
.lang-switch { display: inline-flex; gap: 8px; align-items: center; margin-left: 8px; font-size: .88rem; }
.lang-switch a { color: var(--muted); }
.lang-switch a.active { color: var(--primary); font-weight: 700; }
.nav-toggle {
  display: none; border: 1px solid var(--border); background: #0B1220; color: #fff;
  border-radius: 10px; padding: 8px 12px; cursor: pointer;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 12px 22px; border-radius: 999px; border: 0;
  font: inherit; font-weight: 700; cursor: pointer; text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-accent {
  background: linear-gradient(135deg, #22D3EE, #0284C7);
  color: #04101F !important; box-shadow: 0 10px 28px rgba(34,211,238,.22);
}
.btn-ghost, .btn-outline {
  background: transparent; color: #F8FAFC !important;
  border: 1px solid rgba(148,163,184,.45);
}

.portal-hero {
  position: relative; min-height: min(92vh, 820px);
  display: grid; align-items: center;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(720px 360px at 50% 0%, rgba(34,211,238,.18), transparent 55%),
    linear-gradient(165deg, #020617 0%, #0C4A6E 48%, #020617 100%);
}
.portal-hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-glow {
  position: absolute; border-radius: 50%; filter: blur(42px); opacity: .5;
  animation: glowDrift 12s ease-in-out infinite alternate;
}
.hero-glow-a {
  width: 420px; height: 420px; left: 8%; top: 18%;
  background: rgba(34,211,238,.35);
}
.hero-glow-b {
  width: 360px; height: 360px; right: 10%; bottom: 8%;
  background: rgba(14,165,233,.28);
  animation-delay: -4s;
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(34,211,238,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34,211,238,.07) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(circle at 50% 40%, #000 20%, transparent 75%);
  opacity: .55;
}
@keyframes glowDrift {
  from { transform: translate3d(0,0,0) scale(1); }
  to { transform: translate3d(24px,-18px,0) scale(1.08); }
}
.portal-hero-inner {
  position: relative; z-index: 1;
  text-align: center; padding: 96px 0 88px;
  animation: heroIn .9s ease both;
}
@keyframes heroIn {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: none; }
}
.brand-hero {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(3rem, 8.5vw, 5.8rem);
  font-weight: 700; letter-spacing: .18em;
  line-height: 1; color: #F8FAFC;
  text-shadow: 0 0 40px rgba(34,211,238,.25);
}
.portal-hero h1 {
  margin: 0 auto 16px;
  max-width: 18em;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.2vw, 2.35rem);
  font-weight: 600; line-height: 1.3; letter-spacing: .04em;
}
.hero-lead {
  margin: 0 auto 28px;
  max-width: 38em;
  color: rgba(226,232,240,.82);
  font-size: 1.05rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }

.section { padding: 72px 0; }
.section.alt {
  background: linear-gradient(180deg, rgba(11,18,32,.9), rgba(2,6,23,.95));
  border-block: 1px solid rgba(30,41,59,.8);
}
.section-head { margin-bottom: 28px; }
.section-head-center { text-align: center; }
.section-head h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.4vw, 2.05rem);
  font-weight: 700; letter-spacing: .06em;
}
.section-head p { margin: 0 auto; color: var(--muted); max-width: 40em; }

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.matrix-tile {
  position: relative;
  display: block;
  padding: 28px 24px 24px;
  border-radius: 4px;
  background: linear-gradient(160deg, rgba(15,23,42,.95), rgba(11,18,32,.98));
  border: 1px solid #243247;
  box-shadow: var(--shadow);
  color: inherit;
  text-decoration: none;
  overflow: hidden;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
  animation: tileIn .7s ease both;
  animation-delay: calc(var(--i, 0) * .07s);
}
@keyframes tileIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: none; }
}
.matrix-tile::before {
  content: "";
  position: absolute; left: 0; right: 0; top: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: .7;
}
.matrix-tile:hover {
  transform: translateY(-4px);
  border-color: rgba(34,211,238,.55);
  box-shadow: 0 22px 48px rgba(34,211,238,.08);
}
.matrix-code {
  display: block;
  font-family: var(--font-mono);
  font-size: .85rem; letter-spacing: .2em;
  color: var(--primary); font-weight: 600; margin-bottom: 10px;
}
.matrix-tile h3 {
  margin: 0 0 8px;
  font-size: 1.2rem;
  color: #F8FAFC;
}
.matrix-tile p { margin: 0 0 14px; color: var(--muted); font-size: .95rem; }
.matrix-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .72rem; font-weight: 600; color: #67E8F9;
  background: rgba(34,211,238,.1); padding: 5px 10px; border-radius: 4px;
  border: 1px solid rgba(34,211,238,.25);
}

.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: 1.2fr .8fr; gap: 22px; }
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow);
}
.card p { margin: 0 0 14px; color: var(--muted); }
.tag {
  display: inline-block; font-size: .75rem; font-weight: 700; color: #67E8F9;
  background: rgba(34,211,238,.1); padding: 5px 10px; border-radius: 4px; margin-bottom: 12px;
}
.product-card { text-align: center; }
.product-title { margin: 0 0 8px; font-size: 1.15rem; }
.product-title-link { color: inherit; text-decoration: none; }
.product-title-link:hover { color: var(--primary); }
.product-card .list-check {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  margin: 4px auto 0;
  max-width: 100%;
}
.product-card .list-check li {
  display: flex;
  align-items: flex-start;
  gap: .45em;
  padding-left: 0;
  text-align: left;
}
.product-card .list-check li::before {
  position: static;
  flex-shrink: 0;
  line-height: 1.65;
}
.center-link { text-align: center; margin-top: 26px; }

.page-hero { padding: 48px 0 12px; }
.page-hero h1 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  letter-spacing: .04em;
}
.page-hero p { margin: 0; color: var(--muted); max-width: 42em; }

.about-hero {
  padding: 64px 0 40px;
  background:
    radial-gradient(600px 240px at 20% 0%, rgba(34,211,238,.18), transparent 60%),
    linear-gradient(160deg, #020617, #0C4A6E 70%);
  color: #fff;
}
.about-hero-inner { width: min(100% - 32px, var(--max)); margin-inline: auto; }
.about-hero h1 { font-family: var(--font-display); margin: 10px 0; font-size: clamp(1.8rem, 3.2vw, 2.5rem); }
.about-hero p { margin: 0; color: rgba(226,232,240,.82); max-width: 40em; }
.tag-light { background: rgba(255,255,255,.1); color: #E2E8F0; }
.about-grid { display: grid; grid-template-columns: 1.5fr .9fr; gap: 22px; }
.about-points { display: grid; gap: 12px; }
.about-point {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px; padding: 16px 18px;
}
.about-point h3 { margin: 0 0 6px; font-size: 1.05rem; }
.about-point p { margin: 0; color: var(--muted); }
.about-side {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 18px;
  padding: 22px; box-shadow: var(--shadow); position: sticky; top: 92px;
}
.about-side dt { font-size: .8rem; color: var(--muted); margin-top: 12px; }
.about-side dd { margin: 4px 0 0; font-weight: 700; }
.about-side dt:first-child { margin-top: 0; }
.about-side a { color: var(--primary); }
.prose-strong { color: var(--text); }

.case-card { text-align: center; }
.case-card img {
  width: 100%; height: 168px; object-fit: cover; border-radius: 12px; margin-bottom: 14px;
  background: #0B1220; border: 1px solid #334155;
}
.case-title { margin: 0; font-size: 1.05rem; line-height: 1.45; }
.case-title-link { color: inherit; text-decoration: none; }
.case-title-link:hover { color: var(--primary); }

.faq-item {
  border: 1px solid var(--border); border-radius: 14px; background: var(--bg-card);
  margin-bottom: 12px; overflow: hidden;
}
.faq-item button {
  width: 100%; text-align: left; background: transparent; border: 0; cursor: pointer;
  padding: 18px 20px; font: inherit; font-weight: 700; color: var(--text);
  display: flex; justify-content: space-between; gap: 16px;
}
.faq-item .faq-a {
  display: none; padding: 0 20px 18px; color: var(--muted); margin: 0;
  border-top: 1px dashed var(--border); padding-top: 14px;
}
.faq-item.open .faq-a { display: block; }

.form {
  display: grid; gap: 14px; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 18px; padding: 26px; box-shadow: var(--shadow);
}
.form label { display: grid; gap: 6px; font-weight: 600; font-size: .92rem; }
.form input, .form select, .form textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 12px;
  padding: 11px 12px; font: inherit; background: #020617; color: var(--text);
}
.form textarea { min-height: 120px; resize: vertical; }
.form .hp { position: absolute; left: -9999px; height: 0; overflow: hidden; }
.form-msg { font-size: .92rem; }
.form-msg.ok { color: #34D399; }
.form-msg.err { color: #F87171; }

.cta-banner, .portal-cta {
  display: flex; justify-content: space-between; align-items: center; gap: 20px;
  padding: 28px 30px; border-radius: 20px;
  background:
    radial-gradient(500px 200px at 10% 0%, rgba(34,211,238,.18), transparent 55%),
    linear-gradient(120deg, #020617, #0E7490);
  color: #fff;
  border: 1px solid rgba(34,211,238,.2);
}
.cta-banner h2 { margin: 0 0 8px; font-family: var(--font-display); font-size: 1.45rem; letter-spacing: .04em; }
.cta-banner p { margin: 0; color: rgba(226,232,240,.8); }
.cta-banner-actions { display: flex; flex-wrap: wrap; gap: 10px; }

.friend-links {
  margin-top: 20px; padding: 22px 0 0;
  background:
    radial-gradient(600px 240px at 10% 0%, rgba(14,165,233,.12), transparent 60%),
    #020617;
  color: rgba(248,250,252,.82);
}
.friend-links-inner {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px 18px;
  padding-bottom: 18px; border-bottom: 1px solid rgba(255,255,255,.1);
}
.friend-links-title { margin: 0; font-size: .95rem; font-weight: 700; color: #F8FAFC; }
.friend-links-list {
  list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 16px;
}
.friend-links-list a { color: rgba(248,250,252,.78); font-size: .9rem; }
.friend-links-list a:hover { color: #22D3EE; }
.friend-links + .site-footer { margin-top: 0; padding-top: 28px; }

.site-footer {
  margin-top: 20px;
  background:
    radial-gradient(600px 240px at 10% 0%, rgba(14,165,233,.12), transparent 60%),
    #020617;
  color: rgba(248,250,252,.82); padding: 52px 0 26px;
}
.site-footer a { color: #F8FAFC; }
.site-footer h3 { margin: 0 0 14px; color: #F8FAFC; font-size: 1rem; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 28px; }
.footer-list { list-style: none; margin: 0; padding: 0; }
.footer-list li { margin: 8px 0; }
.footer-cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.footer-bottom {
  margin-top: 28px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.1);
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: .9rem;
}
.list-check { margin: 0; padding: 0; list-style: none; color: var(--muted); }
.list-check li { position: relative; padding-left: 1.4em; margin: 10px 0; }
.list-check li::before {
  content: "✓"; position: absolute; left: 0; color: var(--primary); font-weight: 700;
}
.meta { font-size: .9rem; color: var(--muted); margin-top: 10px; }
.narrow { max-width: 720px; }
.prose { color: var(--muted); line-height: 1.8; }

@media (max-width: 991px) {
  .matrix-grid, .grid-3, .footer-grid, .about-grid, .grid-2 { grid-template-columns: 1fr 1fr; }
  .nav-toggle { display: inline-flex; }
  .main-nav {
    display: none; width: 100%; flex-direction: column; align-items: flex-start;
    padding: 8px 0 16px;
  }
  .main-nav.open { display: flex; }
  .header-inner { flex-wrap: wrap; }
  .about-side { position: static; }
  .cta-banner { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 768px) {
  .matrix-grid, .grid-3, .grid-2, .footer-grid, .about-grid { grid-template-columns: 1fr; }
  .portal-hero-inner { padding: 72px 0 64px; }
}