/* ============================================
   知思屋 Zhisiwu 官网 · 全站样式（移动优先）
   ============================================ */

:root {
  --bg-deep: #0d0221;
  --bg-mid: #1a0b3b;
  --bg-blue: #0b1b3a;
  --gold: #e8c87a;
  --gold-bright: #f5dfa8;
  --text: #ede8f5;
  --text-muted: #a79fc0;
  --card-bg: rgba(255, 255, 255, 0.045);
  --card-border: rgba(232, 200, 122, 0.18);
  --serif: "Noto Serif SC", "Songti SC", "STSong", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, sans-serif;
}

/* ---------- 中英文切换：按 data-lang 显隐 ---------- */
html[data-lang="zh"] .en { display: none !important; }
html[data-lang="en"] .zh { display: none !important; }

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--text);
  background: linear-gradient(160deg, var(--bg-deep) 0%, var(--bg-mid) 45%, var(--bg-blue) 100%);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* 星空点缀 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(1.5px 1.5px at 12% 18%, rgba(255, 255, 255, 0.9), transparent 100%),
    radial-gradient(1px 1px at 28% 42%, rgba(255, 255, 255, 0.6), transparent 100%),
    radial-gradient(2px 2px at 45% 12%, rgba(245, 223, 168, 0.8), transparent 100%),
    radial-gradient(1px 1px at 62% 32%, rgba(255, 255, 255, 0.55), transparent 100%),
    radial-gradient(1.5px 1.5px at 78% 20%, rgba(255, 255, 255, 0.75), transparent 100%),
    radial-gradient(1px 1px at 88% 48%, rgba(245, 223, 168, 0.6), transparent 100%),
    radial-gradient(1px 1px at 8% 68%, rgba(255, 255, 255, 0.45), transparent 100%),
    radial-gradient(1.5px 1.5px at 55% 75%, rgba(255, 255, 255, 0.5), transparent 100%),
    radial-gradient(1px 1px at 92% 82%, rgba(255, 255, 255, 0.4), transparent 100%);
}

main, header, footer { position: relative; z-index: 1; }

img { display: block; max-width: 100%; }
a { color: var(--gold); text-decoration: none; }
a:hover { color: var(--gold-bright); }

.container { width: min(1080px, 92%); margin: 0 auto; }

h1, h2, h3, .serif { font-family: var(--serif); }

section { padding: 56px 0; }

.section-title {
  text-align: center;
  font-size: 1.6rem;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.section-sub {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 32px;
}

.section-title::after {
  content: "";
  display: block;
  width: 56px;
  height: 2px;
  margin: 12px auto 0;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(13, 2, 33, 0.72);
  border-bottom: 1px solid rgba(232, 200, 122, 0.14);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-family: var(--serif);
  font-size: 1.1rem;
  letter-spacing: 0.12em;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  box-shadow: 0 0 12px rgba(232, 200, 122, 0.35);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links {
  display: none;
  flex-direction: column;
  position: absolute;
  top: 60px;
  left: 0;
  right: 0;
  background: rgba(13, 2, 33, 0.96);
  border-bottom: 1px solid rgba(232, 200, 122, 0.14);
  padding: 8px 0;
}

.nav-links a {
  display: block;
  padding: 12px 24px;
  color: var(--text);
  font-size: 0.95rem;
}

.nav-links a:hover, .nav-links a.active { color: var(--gold); }

.site-header.nav-open .nav-links { display: flex; }

.lang-btn, .nav-toggle {
  background: transparent;
  border: 1px solid rgba(232, 200, 122, 0.45);
  color: var(--gold);
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  font-family: var(--sans);
}

.lang-btn:hover, .nav-toggle:hover { background: rgba(232, 200, 122, 0.14); }

.nav-toggle { display: inline-flex; align-items: center; padding: 5px 12px; }
.nav-toggle svg { width: 18px; height: 18px; }

/* ---------- Hero ---------- */
.hero { padding: 72px 0 56px; text-align: center; }

.hero-icon {
  width: 108px;
  height: 108px;
  border-radius: 26px;
  margin: 0 auto 22px;
  box-shadow: 0 8px 40px rgba(232, 200, 122, 0.3), 0 0 0 1px rgba(232, 200, 122, 0.25);
}

.hero h1 {
  font-size: 2.4rem;
  letter-spacing: 0.22em;
  margin-bottom: 10px;
  background: linear-gradient(180deg, #fff, var(--gold-bright));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero .slogan {
  font-family: var(--serif);
  color: var(--gold);
  font-size: 1.05rem;
  letter-spacing: 0.24em;
  margin-bottom: 20px;
}

.hero .intro {
  max-width: 560px;
  margin: 0 auto 36px;
  color: var(--text-muted);
  font-size: 0.98rem;
}

/* ---------- 下载按钮 ---------- */
.badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 190px;
  padding: 10px 22px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(232, 200, 122, 0.4);
  color: var(--text);
  transition: transform 0.2s, background 0.2s, box-shadow 0.2s;
}

.badge:hover {
  transform: translateY(-2px);
  background: rgba(232, 200, 122, 0.12);
  box-shadow: 0 8px 24px rgba(232, 200, 122, 0.22);
  color: var(--text);
}

.badge svg { width: 30px; height: 30px; flex: none; }

.badge-text { display: flex; flex-direction: column; text-align: left; line-height: 1.25; }
.badge-text small { font-size: 0.68rem; color: var(--text-muted); letter-spacing: 0.04em; }
.badge-text strong { font-size: 1.05rem; font-weight: 600; }

/* ---------- 特色卡片 ---------- */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 26px 22px;
  text-align: center;
  transition: transform 0.25s, border-color 0.25s;
}

.feature-card:hover { transform: translateY(-4px); border-color: rgba(232, 200, 122, 0.45); }

.feature-glyph {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 1.5rem;
  color: var(--bg-deep);
  background: linear-gradient(135deg, var(--gold-bright), var(--gold));
  box-shadow: 0 4px 18px rgba(232, 200, 122, 0.35);
}

.feature-card h3 { font-size: 1.08rem; margin-bottom: 8px; letter-spacing: 0.06em; }
.feature-card p { color: var(--text-muted); font-size: 0.88rem; }

/* ---------- 截图 ---------- */
.shots-row {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 8px 4px 20px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.shot {
  flex: 0 0 auto;
  width: 216px;
  scroll-snap-align: center;
}

.shot img {
  width: 100%;
  border-radius: 22px;
  border: 1px solid rgba(232, 200, 122, 0.28);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
}

/* ---------- 法律页面正文 ---------- */
.legal-body { max-width: 760px; margin: 0 auto; padding-bottom: 24px; }

.legal-body .update-date {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 32px;
}

.legal-body h2 { font-size: 1.35rem; letter-spacing: 0.08em; margin: 4px 0 6px; }

.legal-body h3 {
  font-size: 1.02rem;
  color: var(--gold);
  margin: 28px 0 10px;
  letter-spacing: 0.04em;
}

.legal-body p, .legal-body li {
  color: #cfc8e0;
  font-size: 0.92rem;
  margin-bottom: 8px;
}

.legal-body ul { padding-left: 1.3em; }

.legal-body .placeholder {
  color: var(--gold-bright);
  border-bottom: 1px dashed rgba(232, 200, 122, 0.5);
}

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid rgba(232, 200, 122, 0.14);
  padding: 32px 0 40px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-links { margin-bottom: 10px; }
.footer-links a { margin: 0 10px; color: var(--text-muted); }
.footer-links a:hover { color: var(--gold); }

/* ---------- 桌面端 ---------- */
@media (min-width: 768px) {
  section { padding: 72px 0; }

  .nav-toggle { display: none; }

  .nav-links {
    display: flex;
    flex-direction: row;
    position: static;
    background: none;
    border: none;
    padding: 0;
    gap: 6px;
  }

  .nav-links a { padding: 6px 14px; }

  .hero { padding: 96px 0 64px; }
  .hero h1 { font-size: 3rem; }

  .features-grid { grid-template-columns: repeat(2, 1fr); }

  .shots-row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 18px;
    overflow: visible;
    padding: 8px 0 0;
  }

  .shot { width: auto; }
}

@media (min-width: 1024px) {
  .features-grid { grid-template-columns: repeat(4, 1fr); }
}