/* ============================================================
   彩虹群发 - 全局公共样式
   所有页面引入此文件，修改一处即全站生效。
   ============================================================ */

/* ===== Reset & Variables ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #0088cc;
  --primary-light: #0077b6;
  --primary-dark: #006da8;
  --accent: #7c4dff;
  --accent-light: #9c7cff;
  --green: #00a844;
  --green-dim: rgba(0,168,68,0.1);
  --orange: #ff9100;
  --red: #e53935;
  --bg: #ffffff;
  --bg-card: #f7f8fa;
  --bg-card-hover: #eef0f4;
  --surface: #f0f1f3;
  --text: #1a1a2e;
  --text-muted: #555566;
  --text-dim: #888899;
  --border: #e2e4e9;
  --border-light: #d5d7dc;
  --gradient-1: linear-gradient(135deg, #0088cc, #7c4dff);
  --gradient-2: linear-gradient(135deg, #0088cc, #00a844);
  --radius: 16px;
  --radius-sm: 10px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary-light); text-decoration: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.gradient-text { background: var(--gradient-1); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

/* ===== Navbar (公共头部) ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 16px 0; transition: all .3s;
}
.navbar.scrolled {
  background: rgba(255,255,255,.92); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border); padding: 12px 0;
}
.navbar.navbar-fixed {
  background: rgba(255,255,255,.92); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border); padding: 14px 0;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; }

.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; font-size: 1.45rem; color: var(--text); }
.logo-icon {
  width: 36px; height: 36px; background: var(--gradient-1); border-radius: 10px;
  display: flex; align-items: center; justify-content: center; color: #fff; font-size: 1.1rem;
}

.nav-links { display: flex; align-items: center; gap: 32px; list-style: none; }
.nav-links a { color: var(--text-muted); text-decoration: none; font-size: .9rem; font-weight: 500; transition: color .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }

.nav-actions { display: flex; align-items: center; gap: 12px; }

.hamburger { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 5px; padding: 4px; }
.hamburger span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: all .3s; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 24px; border-radius: 10px; font-size: .9rem; font-weight: 600;
  text-decoration: none; cursor: pointer; border: none; transition: all .25s; font-family: inherit;
}
.btn-primary { background: var(--gradient-1); color: #fff; box-shadow: 0 4px 24px rgba(0,136,204,.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0,136,204,.45); }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-outline:hover { border-color: var(--primary-light); background: rgba(0,136,204,.06); }
.btn-ghost { background: transparent; color: var(--text-muted); border: none; }
.btn-ghost:hover { color: var(--text); }
.btn-lg { padding: 14px 32px; font-size: 1rem; border-radius: 12px; }
.btn-green { background: linear-gradient(135deg, #00a844, #00c853); color: #fff; font-weight: 700; }
.btn-green:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,200,83,.35); }

/* ===== Sections ===== */
.section { padding: 100px 0; }
.section-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .8rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .08em; color: var(--primary-light); margin-bottom: 16px;
}
.section-label-icon { width: 20px; height: 20px; background: rgba(0,136,204,.15); border-radius: 6px; display: flex; align-items: center; justify-content: center; font-size: .7rem; }
.section-title { font-size: clamp(1.8rem,4vw,2.8rem); font-weight: 800; line-height: 1.15; margin-bottom: 16px; letter-spacing: -.02em; }
.section-desc { font-size: 1.05rem; color: var(--text-muted); max-width: 600px; line-height: 1.7; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-header .section-desc { margin: 0 auto; }

/* ===== Footer (公共底部) ===== */
.footer { border-top: 1px solid var(--border); padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand p { font-size: .88rem; color: var(--text-muted); margin-top: 16px; line-height: 1.6; max-width: 280px; }
.footer-col h4 { font-size: .82rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--text); margin-bottom: 20px; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.footer-col a { font-size: .88rem; color: var(--text-dim); text-decoration: none; transition: color .2s; }
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 32px; border-top: 1px solid var(--border); font-size: .8rem; color: var(--text-dim);
}
.footer-socials { display: flex; gap: 12px; }
.footer-socials a {
  width: 36px; height: 36px; border-radius: 8px; background: var(--surface);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-dim); text-decoration: none; font-size: .85rem; transition: all .2s;
}
.footer-socials a:hover { background: var(--primary); color: #fff; }

/* ===== Animations ===== */
.reveal { opacity: 0; transform: translateY(30px); transition: all .7s cubic-bezier(.16,1,.3,1); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== Legal Pages (terms / privacy) ===== */
.page-wrapper { max-width: 800px; margin: 0 auto; padding: 120px 24px 80px; }
.page-title { font-size: 2rem; font-weight: 800; margin-bottom: 8px; }
.page-meta { color: var(--text-dim); font-size: .88rem; margin-bottom: 48px; }
.legal-section { margin-bottom: 36px; }
.legal-section h2 { font-size: 1.15rem; font-weight: 700; margin-bottom: 12px; color: var(--text); }
.legal-section p, .legal-section li { font-size: .92rem; color: var(--text-muted); line-height: 1.8; }
.legal-section ul { padding-left: 20px; margin: 8px 0; }
.legal-section li { margin-bottom: 6px; }
.highlight-box {
  background: rgba(0,200,83,.06); border: 1px solid rgba(0,200,83,.2); border-radius: var(--radius-sm);
  padding: 16px 20px; margin: 16px 0;
}
.highlight-box p { color: var(--text); }
.footer-mini { text-align: center; padding: 32px 24px; border-top: 1px solid var(--border); color: var(--text-dim); font-size: .82rem; margin-top: 48px; }

/* ===== Responsive (公共) ===== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0;
    background: rgba(255,255,255,.97); backdrop-filter: blur(20px);
    padding: 24px; gap: 16px; border-bottom: 1px solid var(--border);
  }
  .section { padding: 60px 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
}