/* ========================================
   QuickQ v4 — 翡翠绿+青色 极速科技风 全局样式
   Emerald + Cyan Design System
   ======================================== */

:root {
  --bg: #050807;
  --bg2: #0a0f0d;
  --bg3: #0e1613;
  --border: #17241f;
  --border2: #223630;
  --text: #e6ece9;
  --text2: #94a39d;
  --text3: #5e6e68;
  --primary: #10B981;
  --cyan: #22D3EE;
  --lime: #A3E635;
  --green: #22c55e;
  --amber: #f59e0b;
  --red: #ef4444;
  --gradient: linear-gradient(135deg, #10B981, #22D3EE);
  --grad-glow: rgba(16,185,129,.35);
  --primary-subtle: rgba(16,185,129,.08);
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow: 0 4px 16px rgba(0,0,0,.35);
  --shadow-lg: 0 16px 48px rgba(0,0,0,.5);
  --max-w: 1280px;
  --transition: .3s cubic-bezier(.4,0,.2,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ---- 背景网格线 ---- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(16,185,129,.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16,185,129,.02) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  z-index: 0;
}

/* ---- 渐变光斑 ---- */
.orbs { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: .14;
  animation: orbFloat 20s ease-in-out infinite;
}
.orb-1 { width: 600px; height: 600px; background: var(--primary); top: -200px; right: -150px; animation-delay: 0s; }
.orb-2 { width: 500px; height: 500px; background: var(--cyan); bottom: -150px; left: -100px; animation-delay: -7s; }
.orb-3 { width: 400px; height: 400px; background: var(--lime); top: 50%; left: 50%; transform: translate(-50%,-50%); opacity: .07; animation-delay: -14s; }

@keyframes orbFloat {
  0%, 100% { transform: translate(0,0) scale(1); }
  25% { transform: translate(40px,-30px) scale(1.08); }
  50% { transform: translate(-20px,20px) scale(.94); }
  75% { transform: translate(-30px,-15px) scale(1.04); }
}

/* ---- 导航栏 ---- */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0 24px;
  height: 64px;
  transition: background var(--transition), box-shadow var(--transition);
}
.header.scrolled {
  background: rgba(10,15,13,.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 24px rgba(0,0,0,.3);
}
.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--text);
  font-weight: 700; font-size: 20px;
  letter-spacing: -.02em;
}
.logo-icon { width: 36px; height: 36px; flex-shrink: 0; }
.logo-icon svg { display: block; width: 100%; height: 100%; }

.nav { display: flex; align-items: center; gap: 8px; }
.nav-link {
  text-decoration: none; color: var(--text2);
  font-size: 14px; font-weight: 500;
  padding: 8px 14px; border-radius: var(--radius-full);
  transition: all var(--transition);
}
.nav-link:hover { color: var(--text); background: rgba(255,255,255,.06); }
.nav-link.active { color: var(--primary); background: var(--primary-subtle); }

.btn-header {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--gradient);
  color: #fff; text-decoration: none;
  font-size: 13px; font-weight: 600;
  padding: 8px 18px; border-radius: var(--radius-full);
  transition: all var(--transition);
  margin-left: 8px;
}
.btn-header:hover { box-shadow: 0 4px 20px var(--grad-glow); transform: translateY(-1px); }

/* 汉堡菜单 */
.menu-btn {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 6px;
  z-index: 101;
}
.menu-btn span {
  display: block; width: 24px; height: 2px;
  background: var(--text); border-radius: 2px;
  transition: all var(--transition);
}
.menu-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-btn.open span:nth-child(2) { opacity: 0; }
.menu-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
  .nav {
    position: fixed; top: 0; right: -100%;
    width: 280px; height: 100vh;
    flex-direction: column;
    background: rgba(10,15,13,.98);
    backdrop-filter: blur(20px);
    padding: 100px 24px 24px;
    gap: 4px;
    transition: right var(--transition);
  }
  .nav.open { right: 0; }
  .menu-btn { display: flex; }
  .nav-link, .btn-header { width: 100%; text-align: center; justify-content: center; }
  .btn-header { margin-left: 0; }
}

/* ---- 按钮系统 ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px; border-radius: var(--radius);
  font-size: 15px; font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  letter-spacing: -.01em;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 20px var(--grad-glow);
}
.btn-primary:hover { box-shadow: 0 6px 30px var(--grad-glow); transform: translateY(-2px); }
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border2);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-subtle); }
.btn-lg { padding: 18px 36px; font-size: 17px; border-radius: var(--radius-lg); }

/* ---- 通用区块 ---- */
section { position: relative; z-index: 1; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-badge {
  display: inline-block;
  font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .1em;
  color: var(--primary);
  background: var(--primary-subtle);
  padding: 6px 16px; border-radius: var(--radius-full);
  margin-bottom: 20px;
  border: 1px solid rgba(16,185,129,.2);
}
.section-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}
.section-desc {
  font-size: 17px; color: var(--text2);
  max-width: 560px; margin: 0 auto;
  line-height: 1.7;
}
.gradient-text { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

/* ---- 滚动揭示动画（默认可见，JS 标记首屏以下内容为 is-hidden） ---- */
.reveal { opacity: 1; transform: translateY(0); }
.reveal.is-hidden {
  opacity: 0; transform: translateY(30px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: .1s; }
.reveal-delay-2 { transition-delay: .2s; }
.reveal-delay-3 { transition-delay: .3s; }
.reveal-delay-4 { transition-delay: .4s; }
.reveal-delay-5 { transition-delay: .5s; }

/* ---- 页脚 ---- */
.footer {
  position: relative; z-index: 1;
  border-top: 1px solid var(--border);
  padding: 64px 24px 32px;
}
.footer-grid {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}
.footer-brand { max-width: 320px; }
.footer-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-weight: 700; font-size: 18px; margin-bottom: 16px; }
.footer-desc { color: var(--text2); font-size: 14px; line-height: 1.7; }
.footer-col h5 { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--text); margin-bottom: 16px; }
.footer-col a { display: block; color: var(--text2); font-size: 14px; text-decoration: none; padding: 4px 0; transition: color var(--transition); }
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
  max-width: var(--max-w); margin: 48px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 13px; color: var(--text3);
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { max-width: 100%; grid-column: 1 / -1; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}

/* ---- 回到顶部 ---- */
.scroll-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 90;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--bg3); color: var(--text);
  border: 1px solid var(--border2);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: translateY(20px);
  transition: all var(--transition);
  pointer-events: none;
}
.scroll-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.scroll-top:hover { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(16,185,129,.25); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(16,185,129,.4); }