/* ==============================================================================
   SSRDOG 官方知识库与帮助中心专属样式 - ssrdog.help
   Clean Slate Docs & Emerald Teal · Modern Documentation Hub
   ============================================================================== */
:root {
  --bg-main: #061114;
  --bg-surface: #0B1D22;
  --bg-card: #10272E;
  --bg-card-hover: #173640;
  --primary: #0D9488;
  --primary-light: #2DD4BF;
  --primary-glow: rgba(45, 212, 191, 0.4);
  --teal: #14B8A6;
  --cyan: #38BDF8;
  --amber: #F59E0B;
  --green: #10B981;
  --text: #F0FDFA;
  --text-dim: #99F6E4;
  --text-muted: #5EEAD4;
  --border: rgba(45, 212, 191, 0.22);
  --grad-primary: linear-gradient(135deg, #2DD4BF 0%, #0D9488 60%, #115E59 100%);
  --grad-card: linear-gradient(180deg, rgba(16, 39, 46, 0.88) 0%, rgba(11, 29, 34, 0.95) 100%);
  --shadow: 0 12px 36px rgba(0, 0, 0, 0.65), 0 0 25px rgba(13, 148, 136, 0.25);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-main);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.68;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(13, 148, 136, 0.2) 0%, transparent 60%),
    radial-gradient(circle at 90% 40%, rgba(56, 189, 248, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 10% 80%, rgba(45, 212, 191, 0.08) 0%, transparent 50%);
  background-attachment: fixed;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.navbar .container { max-width: 1380px; padding: 0 24px; }

/* Navbar */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(6, 17, 20, 0.94);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}
.navbar-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: nowrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: #FFF; font-weight: 800; font-size: 1.25rem; white-space: nowrap; flex-shrink: 0; }
.brand-name { background: var(--grad-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.brand-tag { background: rgba(45, 212, 191, 0.2); color: var(--primary-light); border: 1px solid var(--border); padding: 2px 7px; border-radius: 4px; font-size: 0.72rem; font-weight: 700; margin-left: 6px; white-space: nowrap; display: inline-block; }
.nav-links { display: flex; align-items: center; gap: 16px; list-style: none; margin: 0; padding: 0; flex-wrap: nowrap; flex-shrink: 1; }
.nav-links li { white-space: nowrap; }
.nav-links a { color: var(--text-dim); text-decoration: none; font-size: 0.92rem; font-weight: 500; transition: color 0.2s; white-space: nowrap; padding: 4px 2px; }
.nav-links a:hover, .nav-links a.active { color: var(--primary-light); }
.nav-actions { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; white-space: nowrap; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 18px; border-radius: 8px; font-weight: 600; font-size: 0.92rem;
  text-decoration: none; transition: all 0.25s ease; cursor: pointer; border: none;
  white-space: nowrap; flex-shrink: 0;
}
.btn-primary {
  background: var(--grad-primary); color: #042F2E;
  box-shadow: 0 4px 15px var(--primary-glow); font-weight: 700;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(45, 212, 191, 0.5);
  color: #042F2E;
}
.btn-outline {
  background: rgba(13, 148, 136, 0.12); color: var(--primary-light);
  border: 1px solid var(--border);
}
.btn-outline:hover { background: rgba(13, 148, 136, 0.25); border-color: var(--primary-light); color: #FFF; }

/* Hero */
.hero { padding: 75px 0 55px; text-align: center; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(13, 148, 136, 0.18); border: 1px solid var(--border);
  padding: 6px 16px; border-radius: 99px; font-size: 0.85rem; color: var(--primary-light);
  margin-bottom: 22px; font-weight: 600;
}
.hero h1 { font-size: 2.85rem; line-height: 1.25; margin-bottom: 20px; font-weight: 800; }
.hero-highlight { background: linear-gradient(135deg, #2DD4BF 0%, #38BDF8 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero-desc { font-size: 1.15rem; color: var(--text-dim); max-width: 820px; margin: 0 auto 32px; }
.hero-actions { display: flex; justify-content: center; gap: 16px; margin-bottom: 40px; flex-wrap: wrap; }

/* Search Bar & Chips */
.search-box {
  max-width: 680px; margin: 0 auto 20px; position: relative;
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px 22px; display: flex; align-items: center; gap: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.search-box input {
  background: none; border: none; outline: none; width: 100%;
  color: #FFF; font-size: 1rem;
}
.search-box input::placeholder { color: #5EEAD4; opacity: 0.7; }
.quick-tags { display: flex; justify-content: center; align-items: center; gap: 8px 12px; flex-wrap: wrap; margin-bottom: 40px; font-size: 0.85rem; color: var(--text-muted); }
.tag-chip {
  background: rgba(45, 212, 191, 0.12); color: var(--primary-light); border: 1px solid var(--border);
  padding: 4px 12px; border-radius: 99px; text-decoration: none; transition: all 0.2s;
}
.tag-chip:hover { background: rgba(45, 212, 191, 0.25); color: #FFF; }

/* Section & Cards */
.section { padding: 60px 0; }
.section-header { text-align: center; margin-bottom: 44px; }
.section-header h2 { font-size: 2.1rem; font-weight: 700; margin-bottom: 12px; color: #FFF; }
.section-header p { font-size: 1.05rem; color: var(--text-dim); max-width: 700px; margin: 0 auto; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

.card {
  background: var(--grad-card); border: 1px solid var(--border);
  border-radius: 14px; padding: 28px; transition: all 0.3s ease;
}
.card:hover { transform: translateY(-4px); border-color: var(--primary-light); box-shadow: var(--shadow); }
.card-icon {
  width: 50px; height: 50px; border-radius: 12px;
  background: rgba(13, 148, 136, 0.18); color: var(--primary-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; margin-bottom: 18px; border: 1px solid var(--border);
}
.card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 12px; color: #FFF; }
.card p { font-size: 0.95rem; color: var(--text-dim); line-height: 1.6; }

/* Interactive FAQ Accordion */
.faq-box { display: flex; flex-direction: column; gap: 14px; max-width: 900px; margin: 0 auto; }
.faq-item {
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: 10px; overflow: hidden; transition: all 0.2s;
}
.faq-item summary {
  padding: 18px 22px; font-weight: 700; font-size: 1.05rem; cursor: pointer;
  color: #FFF; list-style: none; display: flex; align-items: center; justify-content: space-between;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 1.4rem; color: var(--primary-light); }
.faq-item[open] summary::after { content: "−"; color: var(--cyan); }
.faq-item p { padding: 0 22px 20px; color: var(--text-dim); font-size: 0.95rem; line-height: 1.7; }

/* Quick Jump Dock */
.quick-jump-dock {
  position: fixed; right: 24px; bottom: 28px; z-index: 999;
  display: flex; flex-direction: column; gap: 10px;
  transform: translateY(20px); opacity: 0; pointer-events: none;
  transition: all 0.3s ease;
}
.quick-jump-dock.visible { transform: translateY(0); opacity: 1; pointer-events: auto; }
.dock-btn {
  background: var(--bg-surface); border: 1px solid var(--border);
  color: var(--text); padding: 10px 16px; border-radius: 99px;
  text-decoration: none; font-size: 0.85rem; font-weight: 600;
  display: flex; align-items: center; gap: 6px; box-shadow: 0 4px 16px rgba(0,0,0,0.4);
  transition: all 0.2s;
}
.dock-btn:hover { background: var(--bg-card-hover); border-color: var(--primary-light); color: #FFF; }
.dock-btn.primary { background: var(--grad-primary); border: none; color: #042F2E; font-weight: 700; }

/* Ecosystem & Friendly Links */
.footer-friendly-links {
  background: rgba(13, 148, 136, 0.05);
  border: 1px solid var(--border); border-radius: 12px;
  padding: 20px 24px; margin-bottom: 30px;
}
.links-title { font-size: 0.9rem; font-weight: 700; color: var(--primary-light); margin-bottom: 12px; }
.links-flex { display: flex; flex-wrap: wrap; gap: 10px 16px; }
.friendly-link {
  font-size: 0.85rem; color: var(--text-dim); text-decoration: none;
  background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.08);
  padding: 5px 12px; border-radius: 6px; transition: all 0.2s;
}
.friendly-link:hover, .friendly-link.current {
  background: rgba(13, 148, 136, 0.25); border-color: var(--primary-light); color: #FFF; }

/* Footer */
.footer {
  border-top: 1px solid var(--border); background: #030B0D;
  padding: 60px 0 30px; font-size: 0.9rem; color: #14B8A6;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-about h3 { font-size: 1.15rem; color: #FFF; margin-bottom: 12px; }
.footer-col h4 { font-size: 1rem; color: #FFF; margin-bottom: 16px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: var(--text-dim); text-decoration: none; transition: color 0.2s; }
.footer-col a:hover { color: var(--primary-light); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); padding-top: 24px; text-align: center; color: var(--text-muted); }

@media (max-width: 900px) {
  .hero h1 { font-size: 2.1rem; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .nav-links { display: none; }
}