/* ══════════════════════════════════════════════
   润皓科技 RAISEINFO · 全站公共样式 style.css
══════════════════════════════════════════════ */

/* ── 设计系统变量（深色默认） ── */
:root {
  --bg-base:    #060c18;
  --bg-surface: #0d1628;
  --bg-card:    #111d33;
  --bg-raised:  #162040;
  --brand:      #0ea5e9;
  --brand-dim:  #0284c7;
  --brand-glow: rgba(14,165,233,0.35);
  --cyan:       #22d3ee;
  --gold:       #f59e0b;
  --green:      #10b981;
  --red:        #ef4444;
  --text-hi:    #f0f6ff;
  --text-md:    #94a3b8;
  --text-lo:    #4b607c;
  --border:     rgba(14,165,233,0.12);
  --border-hi:  rgba(14,165,233,0.28);
  --line:       rgba(255,255,255,0.06);
  --radius-sm:  2px;
  --font-en:    'Rajdhani', sans-serif;
  --font-cn:    'Noto Sans SC', sans-serif;
  --font-serif: 'Noto Serif SC', serif;
}

/* ── 亮色主题覆盖 ── */
html[data-theme="light"] {
  --bg-base:    #f0f4fa;
  --bg-surface: #e6edf8;
  --bg-card:    #ffffff;
  --bg-raised:  #dce6f4;
  --brand:      #0284c7;
  --brand-dim:  #0369a1;
  --brand-glow: rgba(2,132,199,0.20);
  --cyan:       #0891b2;
  --gold:       #d97706;
  --green:      #059669;
  --red:        #dc2626;
  --text-hi:    #0f172a;
  --text-md:    #475569;
  --text-lo:    #94a3b8;
  --border:     rgba(2,132,199,0.14);
  --border-hi:  rgba(2,132,199,0.32);
  --line:       rgba(0,0,0,0.07);
}

/* ── Reset ── */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  font-family: var(--font-cn);
  background: var(--bg-base);
  color: var(--text-hi);
  overflow-x: hidden;
}

/* ── 全局滚动条 ── */
::-webkit-scrollbar { width:4px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--brand); }

/* ── 全局主题过渡 ── */
body, nav, .card, .section-card, .nav-dropdown,
footer, .footer-bottom { 
  transition: background-color .35s ease, color .35s ease, border-color .35s ease;
}

/* ── 背景辉光 ── */
body::before {
  content:'';
  position:fixed; inset:0;
  background:
    radial-gradient(ellipse 120% 60% at 80% -10%, rgba(14,165,233,0.06) 0%, transparent 55%),
    radial-gradient(ellipse 80% 50% at -10% 70%, rgba(34,211,238,0.04) 0%, transparent 50%);
  pointer-events:none; z-index:0;
}
html[data-theme="light"] body::before {
  background:
    radial-gradient(ellipse 120% 60% at 80% -10%, rgba(2,132,199,0.07) 0%, transparent 55%),
    radial-gradient(ellipse 80% 50% at -10% 70%, rgba(8,145,178,0.05) 0%, transparent 50%);
}

/* ══════════════════════════════
   NAV
══════════════════════════════ */
nav {
  position:fixed; top:0; left:0; right:0; z-index:1000;
  display:flex; align-items:center; justify-content:space-between;
  padding:0 52px; height:68px;
  background: rgba(6,12,24,0.88);
  backdrop-filter: blur(20px);
  border-bottom:1px solid var(--border);
}
html[data-theme="light"] nav {
  background: rgba(240,244,250,0.92);
  border-bottom: 1px solid rgba(2,132,199,0.15);
}
nav::before {
  content:'';
  position:absolute; top:0; left:0; right:0; height:1px;
  background: linear-gradient(90deg, transparent, var(--brand), var(--cyan), transparent);
  opacity:0.6;
}
.nav-logo {
  display:flex; align-items:center; gap:14px;
  text-decoration:none;
}
.logo-emblem {
  position:relative;
  width:40px; height:40px;
  background: linear-gradient(135deg, var(--brand), var(--cyan));
  clip-path: polygon(0 0, 85% 0, 100% 15%, 100% 100%, 15% 100%, 0 85%);
  display:flex; align-items:center; justify-content:center;
}
.logo-emblem::after {
  content:'';
  position:absolute; inset:2px;
  background: var(--bg-surface);
  clip-path: polygon(0 0, 83% 0, 100% 17%, 100% 100%, 17% 100%, 0 83%);
}
.logo-emblem span {
  position:relative; z-index:1;
  font-family: var(--font-serif);
  font-size:16px; font-weight:700;
  color: var(--brand);
}
.logo-wordmark { display:flex; flex-direction:column; }
.logo-cn {
  font-size:16px; font-weight:700;
  color: var(--text-hi); letter-spacing:2px;
  font-family: var(--font-cn);
}
.logo-en {
  font-size:10px; font-weight:600;
  color: var(--brand); letter-spacing:4px;
  font-family: var(--font-en); margin-top:1px;
}
.nav-links {
  display:flex; gap:2px; list-style:none; align-items:center;
}
.nav-links > li { position:relative; }
.nav-links > li > a,
.nav-links > li > span {
  display:flex; align-items:center; gap:5px;
  padding:8px 16px;
  font-size:13px; font-weight:500;
  color: var(--text-md); letter-spacing:0.5px;
  text-decoration:none; cursor:pointer;
  transition:color 0.2s, background 0.2s;
  white-space:nowrap;
}
.nav-links > li > a:hover,
.nav-links > li > span:hover,
.nav-links > li:hover > span,
.nav-links > li > a.active {
  color: var(--brand);
  background: rgba(14,165,233,0.07);
}
.has-dropdown > span::after {
  content:'▾'; font-size:9px; opacity:0.4; transition:transform 0.2s;
}
.has-dropdown:hover > span::after { transform:rotate(180deg); opacity:1; }
.nav-dropdown {
  position:absolute; top:100%; left:0;
  min-width:260px;
  background: var(--bg-card);
  border:1px solid var(--border-hi);
  box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 0 1px rgba(14,165,233,0.05);
  opacity:0; pointer-events:none;
  transform:translateY(0);
  /* 用 padding-top 做透明桥接，消除 li 与下拉框之间的空隙 */
  padding-top: 8px;
  /* 消失时加 100ms 延迟，避免鼠标轻微偏移导致菜单闪失 */
  transition: opacity 0.18s ease 0.1s, visibility 0.18s ease 0.1s;
  visibility: hidden;
  z-index:200;
}
.has-dropdown:hover .nav-dropdown {
  opacity:1; pointer-events:auto; visibility:visible;
  transition-delay: 0s;
}
/* 透明"安全桥"：在 li 下方与 dropdown 之间填充可悬停区域 */
.has-dropdown::after {
  content: '';
  position: absolute;
  top: 100%; left: 0;
  width: 100%; height: 10px;
  background: transparent;
}
.nav-dropdown-header {
  padding:6px 16px 7px;
  font-size:9px; font-weight:700;
  letter-spacing:3px; text-transform:uppercase;
  color: var(--text-lo); border-bottom:1px solid var(--line);
  font-family: var(--font-en);
}
.nav-dropdown a {
  display:flex; align-items:center; gap:14px;
  padding:13px 16px;
  text-decoration:none; font-size:13px;
  color: var(--text-md); border-bottom:1px solid var(--line);
  transition:background 0.15s, color 0.15s;
}
.nav-dropdown a:last-child { border-bottom:none; }
.nav-dropdown a:hover { background:rgba(14,165,233,0.06); color:var(--brand); }
.dd-icon {
  width:30px; height:30px;
  background: var(--bg-raised); border:1px solid var(--border);
  display:flex; align-items:center; justify-content:center;
  font-size:14px; flex-shrink:0;
}
.dd-new {
  margin-left:auto; font-size:9px; font-weight:700;
  letter-spacing:1px; color:var(--bg-base);
  background: var(--brand); padding:2px 7px;
  font-family: var(--font-en);
}
.dd-text strong { display:block; font-size:13px; font-weight:600; color:var(--text-hi); margin-bottom:1px; }
.dd-text small  { font-size:11px; color:var(--text-lo); }
.nav-cta {
  display:flex; align-items:center; gap:8px;
  padding:9px 22px;
  background: var(--brand); color: var(--bg-base);
  font-size:13px; font-weight:700; letter-spacing:0.5px;
  text-decoration:none;
  clip-path: polygon(0 0, 100% 0, 100% 65%, 90% 100%, 0 100%);
  transition:all 0.2s;
}
.nav-cta:hover {
  background: var(--cyan);
  box-shadow: 0 0 20px var(--brand-glow);
}

/* 主题切换开关 */
.theme-toggle {
  display:flex; align-items:center; gap:7px;
  background:none; border:none; cursor:pointer; padding:4px;
}
.theme-toggle-track {
  position:relative; display:inline-block;
  width:40px; height:22px;
  background: var(--bg-raised); border:1.5px solid var(--border-hi);
  border-radius:11px; transition: background .3s, border-color .3s;
}
.theme-toggle-thumb {
  position:absolute; top:2px; left:2px;
  width:14px; height:14px; border-radius:50%;
  background: var(--brand); box-shadow: 0 0 6px var(--brand-glow);
  transition: transform .3s, background .3s;
}
html[data-theme="light"] .theme-toggle-track { background: #bfdbfe; border-color: rgba(2,132,199,0.35); }
html[data-theme="light"] .theme-toggle-thumb { transform: translateX(18px); }
.theme-toggle-icon { font-size:15px; line-height:1; user-select:none; }

/* ══════════════════════════════
   PAGE HERO（内页通用）
══════════════════════════════ */
.page-hero {
  padding: 140px 52px 80px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  position: relative; overflow: hidden;
}
.page-hero::before {
  content:'';
  position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(14,165,233,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,165,233,0.04) 1px, transparent 1px);
  background-size:72px 72px;
}
html[data-theme="light"] .page-hero::before {
  background-image:
    linear-gradient(rgba(2,132,199,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(2,132,199,0.06) 1px, transparent 1px);
}
.page-hero::after {
  content:'';
  position:absolute; top:-20%; right:-10%;
  width:600px; height:600px;
  background: radial-gradient(circle, rgba(14,165,233,0.07) 0%, transparent 60%);
  pointer-events:none;
}
.page-hero-inner { position:relative; z-index:2; max-width:720px; }
.page-eyebrow {
  display:inline-flex; align-items:center; gap:10px;
  font-size:11px; font-weight:600; letter-spacing:4px;
  text-transform:uppercase; color:var(--brand);
  font-family: var(--font-en); margin-bottom:20px;
}
.page-eyebrow::before {
  content:''; display:block; width:36px; height:1px;
  background: linear-gradient(90deg, var(--brand), var(--cyan));
}
.page-eyebrow::after {
  content:''; display:block; width:6px; height:6px;
  background:var(--cyan); clip-path:polygon(50% 0%,100% 50%,50% 100%,0% 50%);
}
.page-title {
  font-family: var(--font-serif);
  font-size: clamp(32px, 4vw, 58px);
  font-weight:700; line-height:1.2; color:var(--text-hi);
  margin-bottom:18px;
}
.page-title em {
  font-style:normal;
  background: linear-gradient(135deg, var(--brand), var(--cyan));
  -webkit-background-clip:text; -webkit-text-fill-color:transparent;
  background-clip:text;
}
.page-desc {
  font-size: clamp(14px, 1.5vw, 17px);
  font-weight:300; color:var(--text-md);
  line-height:1.8; max-width:580px;
}

/* ══════════════════════════════
   SECTION 通用
══════════════════════════════ */
section { padding:100px 52px; position:relative; }
.section-header {
  display:flex; align-items:flex-end;
  justify-content:space-between; margin-bottom:60px;
}
.section-label {
  display:flex; align-items:center; gap:10px;
  font-size:10px; font-weight:700; letter-spacing:4px;
  text-transform:uppercase; color:var(--brand);
  margin-bottom:14px; font-family:var(--font-en);
}
.section-label::before {
  content:''; display:block; width:28px; height:1px;
  background: linear-gradient(90deg, var(--brand), var(--cyan));
}
.section-label::after {
  content:''; display:block; width:5px; height:5px;
  background:var(--brand); clip-path:polygon(50% 0%,100% 50%,50% 100%,0% 50%);
}
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(26px, 3vw, 42px);
  font-weight:700; line-height:1.25; color:var(--text-hi);
}

/* ══════════════════════════════
   STATS BAR
══════════════════════════════ */
.stats-bar {
  background: var(--bg-surface);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
  padding:0 52px;
  display:grid; grid-template-columns:repeat(4,1fr);
}
.stat-item {
  padding:32px 0; border-right:1px solid var(--line); padding-left:32px;
}
.stat-item:first-child { padding-left:0; }
.stat-item:last-child { border-right:none; }
.stat-num {
  font-family: var(--font-en);
  font-size:48px; font-weight:700;
  color:var(--text-hi); line-height:1; display:block;
}
.stat-num span { color:var(--brand); }
.stat-label { font-size:12px; color:var(--text-lo); margin-top:6px; letter-spacing:0.5px; }

/* ══════════════════════════════
   BUTTONS
══════════════════════════════ */
.btn-primary {
  display:inline-flex; align-items:center; gap:8px;
  padding:14px 32px;
  background: linear-gradient(135deg, var(--brand), var(--brand-dim));
  color: white; font-size:14px; font-weight:700;
  letter-spacing:0.5px; text-decoration:none;
  clip-path: polygon(0 0,100% 0,100% 72%,94% 100%,0 100%);
  transition:all 0.25s;
  box-shadow: 0 4px 20px rgba(14,165,233,0.25);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--cyan), var(--brand));
  box-shadow: 0 8px 30px rgba(14,165,233,0.4);
  transform:translateY(-2px);
}
.btn-outline {
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 28px; border:1px solid var(--border-hi);
  color: var(--brand); font-size:14px; font-weight:600;
  letter-spacing:0.5px; text-decoration:none;
  transition:all 0.25s;
}
.btn-outline:hover {
  background: rgba(14,165,233,0.08);
  border-color: var(--brand);
  box-shadow: 0 0 16px rgba(14,165,233,0.15);
}

/* ══════════════════════════════
   FOOTER
══════════════════════════════ */
footer {
  background: var(--bg-base);
  border-top:1px solid var(--border);
  padding:52px 52px 0;
  display:grid; grid-template-columns:1fr 1fr 1fr 1fr; gap:40px;
}
footer::before {
  content:''; grid-column:1/-1; height:1px;
  background: linear-gradient(90deg, transparent, var(--brand), var(--cyan), transparent);
  opacity:0.3;
}
.foot-brand p { font-size:12px; color:var(--text-lo); line-height:1.8; margin-top:16px; }
.foot-col h4 {
  font-size:10px; font-weight:700; letter-spacing:3px;
  text-transform:uppercase; color:var(--text-lo);
  margin-bottom:18px; font-family:var(--font-en);
}
.foot-col ul { list-style:none; display:flex; flex-direction:column; gap:9px; }
.foot-col ul a { text-decoration:none; font-size:13px; color:var(--text-md); transition:color 0.2s; }
.foot-col ul a:hover { color:var(--brand); }
.footer-bottom {
  background: var(--bg-base); border-top:1px solid var(--line);
  padding:20px 52px;
  display:flex; justify-content:space-between; align-items:center;
  margin-top:48px;
}
html[data-theme="light"] .footer-bottom { background: rgba(2,132,199,0.06); border-top: 1px solid rgba(2,132,199,0.12); }
.footer-bottom p { font-size:12px; color:var(--text-lo); }
.foot-sites { display:flex; gap:24px; }
.foot-sites a {
  font-size:11px; color:var(--text-lo);
  text-decoration:none; font-family:var(--font-en);
  letter-spacing:1px; transition:color 0.2s;
}
.foot-sites a:hover { color:var(--brand); }

/* ══════════════════════════════
   BACK TO TOP
══════════════════════════════ */
#backToTop {
  position: fixed; right: 32px; bottom: 40px; z-index: 999;
  width: 48px; height: 48px; border-radius: 50%;
  border: 1.5px solid var(--border-hi);
  background: var(--bg-raised); color: var(--brand); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 18px var(--brand-glow), 0 4px 20px rgba(0,0,0,0.5);
  opacity: 0; transform: translateY(16px);
  transition: opacity .3s, transform .3s, box-shadow .3s, background .2s;
  pointer-events: none;
}
#backToTop.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
#backToTop:hover {
  background: var(--brand-dim); color: #fff;
  box-shadow: 0 0 28px rgba(14,165,233,0.6), 0 6px 24px rgba(0,0,0,0.5);
}
#backToTop svg { width: 20px; height: 20px; }
#backToTop::before {
  content: ''; position: absolute; inset: -5px; border-radius: 50%;
  border: 1px solid rgba(14,165,233,0.2);
  animation: bttPulse 2.4s ease-in-out infinite;
}
@keyframes bttPulse {
  0%,100% { opacity: .6; transform: scale(1); }
  50%      { opacity: 0;  transform: scale(1.35); }
}

/* ══════════════════════════════
   ANIMATIONS
══════════════════════════════ */
.fade-up {
  opacity:0; transform:translateY(28px);
  transition:opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible { opacity:1; transform:translateY(0); }
.fade-up:nth-child(2) { transition-delay:0.08s; }
.fade-up:nth-child(3) { transition-delay:0.16s; }
.fade-up:nth-child(4) { transition-delay:0.24s; }
.fade-up:nth-child(5) { transition-delay:0.32s; }
.fade-up:nth-child(6) { transition-delay:0.40s; }

/* ══════════════════════════════
   PAGE BREADCRUMB
══════════════════════════════ */
.breadcrumb {
  display:flex; align-items:center; gap:8px;
  font-size:12px; color:var(--text-lo);
  font-family:var(--font-en); letter-spacing:0.5px;
  margin-bottom:24px;
}
.breadcrumb a { color:var(--text-lo); text-decoration:none; transition:color 0.2s; }
.breadcrumb a:hover { color:var(--brand); }
.breadcrumb span { color:var(--text-lo); opacity:0.4; }
.breadcrumb .current { color:var(--brand); }

/* ══════════════════════════════
   CARD 通用
══════════════════════════════ */
.card {
  background: var(--bg-card);
  border:1px solid var(--border);
  padding:32px;
  transition:all 0.3s;
}
.card:hover {
  border-color: var(--border-hi);
  box-shadow: 0 12px 40px rgba(0,0,0,0.25);
  transform:translateY(-4px);
}
.card-top-line::before {
  content:''; display:block; width:100%; height:2px;
  background: linear-gradient(90deg, var(--brand), var(--cyan));
  margin-bottom:24px;
}

/* ══════════════════════════════
   RESPONSIVE
══════════════════════════════ */
@media (max-width:1200px) {
  nav, section, .stats-bar, .page-hero { padding-left:32px; padding-right:32px; }
  .footer-bottom { padding:20px 32px; }
  footer { padding:40px 32px 0; }
}
@media (max-width:900px) {
  nav { padding:0 20px; }
  section, .page-hero { padding:64px 20px; }
  .stats-bar { grid-template-columns:1fr 1fr; padding:0 20px; }
  footer { grid-template-columns:1fr 1fr; padding:40px 20px 0; }
  .footer-bottom { padding:20px; flex-direction:column; gap:12px; text-align:center; }
  .section-header { flex-direction:column; align-items:flex-start; gap:16px; }
}
@media (max-width:600px) {
  .nav-links { display:none; }
  .stats-bar { grid-template-columns:1fr; }
  footer { grid-template-columns:1fr; }
}