/* ==========================================
 * 全局变量与社交感现代重置
 * ========================================== */
:root {
  --bg-color: #0b0c10;
  --surface-dark: rgba(255, 255, 255, 0.03);
  --surface-glass: rgba(255, 255, 255, 0.06);
  --border-glass: rgba(255, 255, 255, 0.08);
  --text-main: #f0f0f5;
  --text-muted: #9ba1b0;
  --brand-primary: #ff4b72;
  --brand-secondary: #8b5cf6;
  --gradient-main: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  --font-base: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
  --gutter: clamp(20px, 5vw, 60px);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; padding: 0;
  background-color: var(--bg-color); color: var(--text-main);
  font-family: var(--font-base); line-height: 1.7;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
h1, h2, h3, h4, p { margin: 0; }

/* ==========================================
 * 动态背景光晕特效
 * ========================================== */
.ambient-background {
  position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
  z-index: -1; overflow: hidden; pointer-events: none;
}
.glow-orb {
  position: absolute; border-radius: 50%; filter: blur(120px); opacity: 0.4;
  animation: float 20s infinite alternate ease-in-out;
}
.orb-1 { width: 400px; height: 400px; background: var(--brand-primary); top: -100px; left: -100px; }
.orb-2 { width: 500px; height: 500px; background: var(--brand-secondary); bottom: -200px; right: -150px; animation-delay: -5s; }
@keyframes float { 0% { transform: translate(0, 0) scale(1); } 100% { transform: translate(100px, 150px) scale(1.2); } }

/* ==========================================
 * 通用组件 (毛玻璃、渐变文字、按钮)
 * ========================================== */
.text-gradient { background: var(--gradient-main); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.glass-panel, .glass-card {
  background: var(--surface-glass); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass); border-radius: 20px;
}
.btn-primary, .btn-secondary {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 28px; border-radius: 30px; font-weight: 600; font-size: 15px; cursor: pointer;
}
.btn-primary { background: var(--gradient-main); color: #fff; box-shadow: 0 8px 20px rgba(255, 75, 114, 0.3); }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 25px rgba(255, 75, 114, 0.4); }
.btn-secondary { background: var(--surface-dark); border: 1px solid var(--border-glass); color: var(--text-main); }
.btn-secondary:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.2); }

/* ==========================================
 * 滚动显现动画 (配合 JS)
 * ========================================== */
.reveal { opacity: 0; transform: translateY(40px); transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94); }
.reveal.reveal-visible { opacity: 1; transform: translateY(0); }

/* ==========================================
 * 顶部导航
 * ========================================== */
.social-header {
  position: fixed; top: 0; width: 100%; z-index: 100;
  background: rgba(11, 12, 16, 0.7); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border-glass);
}
.header-container { display: flex; justify-content: space-between; align-items: center; padding: 15px var(--gutter); max-width: 1400px; margin: 0 auto; }
.brand-logo { display: flex; align-items: center; gap: 12px; font-size: 18px; font-weight: 700; }
.brand-logo img { width: 36px; height: 36px; border-radius: 10px; }
.desktop-nav { display: flex; gap: 30px; }
.desktop-nav a { font-size: 14px; color: var(--text-muted); font-weight: 500; }
.desktop-nav a:hover { color: #fff; }
.nav-download-btn { font-size: 13px; font-weight: 600; padding: 6px 16px; background: rgba(255,255,255,0.1); border-radius: 20px; }
.nav-download-btn:hover { background: #fff; color: #000; }

/* ==========================================
 * 布局基建
 * ========================================== */
main { max-width: 1200px; margin: 0 auto; padding: 100px var(--gutter) 60px; }
.section-container { margin-bottom: 120px; }
.section-header { margin-bottom: 40px; text-align: center; }
.section-num { display: inline-block; font-size: 14px; font-weight: 700; color: var(--brand-primary); margin-bottom: 10px; letter-spacing: 2px; }
.section-header h2 { font-size: clamp(28px, 4vw, 36px); line-height: 1.4; margin-bottom: 15px; }
.section-desc { color: var(--text-muted); font-size: 15px; max-width: 700px; margin: 0 auto; line-height: 1.8; }

/* ==========================================
 * Hero 首屏
 * ========================================== */
.hero-section { display: grid; grid-template-columns: 1.2fr 1fr; gap: 60px; align-items: center; min-height: 80vh; }
.hero-badge { display: inline-block; padding: 6px 16px; background: var(--surface-dark); border: 1px solid var(--border-glass); border-radius: 30px; font-size: 12px; color: var(--brand-secondary); margin-bottom: 20px; }
.hero-title { font-size: clamp(36px, 5vw, 56px); font-weight: 800; line-height: 1.2; margin-bottom: 24px; }
.hero-subtitle { font-size: 16px; color: var(--text-muted); margin-bottom: 40px; line-height: 1.9; }
.hero-actions { display: flex; gap: 20px; align-items: center; flex-wrap: wrap; margin-bottom: 20px; }
.hero-note { font-size: 12px; color: rgba(255,255,255,0.3); }

/* 艺术情绪卡片 */
.art-card { padding: 40px; display: flex; flex-direction: column; justify-content: space-between; height: 100%; min-height: 480px; position: relative; overflow: hidden; }
.art-card::before { content:''; position:absolute; top:0; right:0; width:200px; height:200px; background:var(--brand-primary); filter:blur(100px); opacity:0.2; }
.art-tag { font-size: 10px; letter-spacing: 3px; color: var(--text-muted); }
.art-title { font-size: clamp(60px, 8vw, 100px); font-weight: 900; background: var(--gradient-main); -webkit-background-clip: text; color: transparent; margin: auto 0; text-align: center; }
.art-badge { align-self: center; background: rgba(255,255,255,0.1); padding: 4px 16px; border-radius: 20px; font-size: 12px; margin-bottom: 40px; }
.art-footer p { font-size: 20px; font-weight: 500; margin-bottom: 8px; }
.art-footer span { font-size: 10px; color: var(--text-muted); letter-spacing: 1px; }

/* 价值宣言横幅 */
.core-values-bar { display: flex; justify-content: space-around; flex-wrap: wrap; gap: 20px; padding: 30px; background: rgba(0,0,0,0.4); border-top: 1px solid var(--border-glass); border-bottom: 1px solid var(--border-glass); margin-bottom: 100px; }
.value-item { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.value-item strong { font-size: 18px; color: var(--brand-secondary); letter-spacing: 1px; }
.value-item span { font-size: 13px; color: var(--text-muted); }

/* ==========================================
 * 模块细节排版
 * ========================================== */
.text-content { padding: 50px; font-size: 16px; color: #d1d5db; display: flex; flex-direction: column; gap: 25px; }

.grid-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 25px; }
.item-card { padding: 35px; transition: transform 0.3s ease, background 0.3s ease; }
.item-card:hover { transform: translateY(-5px); background: rgba(255,255,255,0.08); }
.item-card h3 { font-size: 18px; margin-bottom: 15px; display: flex; gap: 10px; align-items: center; }
.item-card p { font-size: 14px; color: var(--text-muted); }

.culture-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.culture-item { border-left: 2px solid var(--border-glass); padding-left: 25px; padding-bottom: 20px; }
.culture-kicker { font-size: 11px; color: var(--brand-primary); letter-spacing: 2px; margin-bottom: 10px; font-weight: 600; }
.culture-item h3 { font-size: 20px; margin-bottom: 15px; }
.culture-item p { font-size: 14px; color: var(--text-muted); margin-bottom: 15px; }

.vision-list { padding: 40px; }
.vision-row { display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 25px 0; border-bottom: 1px solid var(--border-glass); align-items: center; }
.vision-row:last-child { border-bottom: none; padding-bottom: 0; }
.vision-row h4 { font-size: 20px; font-weight: 700; }
.vision-row p { font-size: 15px; color: var(--text-muted); }

/* ==========================================
 * 下载中心
 * ========================================== */
.download-wrapper { display: grid; grid-template-columns: 1fr auto; gap: 50px; padding: 50px; align-items: center; background: linear-gradient(135deg, rgba(255,75,114,0.1), rgba(139,92,246,0.1)); border: 1px solid rgba(255,75,114,0.2); }
.download-info p { font-size: 15px; color: var(--text-muted); margin-top: 15px; max-width: 400px; }
.download-actions { display: flex; gap: 20px; flex-direction: column; }
.dl-box { display: flex; align-items: center; gap: 15px; background: rgba(0,0,0,0.3); padding: 15px; border-radius: 16px; border: 1px solid var(--border-glass); }
.dl-qr img { width: 80px; height: 80px; border-radius: 10px; background: #fff; padding: 4px; display: block; }
.dl-btn { flex: 1; padding: 15px 25px; border-radius: 12px; transition: filter 0.3s; min-width: 180px; }
.dl-btn:hover { filter: brightness(1.1); }
.android-btn { background: #fff; color: #111; }
.ios-btn { background: var(--surface-dark); border: 1px solid var(--border-glass); color: #fff; }
.dl-btn strong { display: block; font-size: 16px; margin-bottom: 4px; }
.dl-btn span { font-size: 11px; opacity: 0.7; }

/* ==========================================
 * 常见问题 FAQ (高质感交互)
 * ========================================== */
.faq-accordion { padding: 10px 40px; }
details { border-bottom: 1px solid var(--border-glass); padding: 25px 0; }
details:last-child { border-bottom: none; }
summary { display: flex; align-items: center; gap: 15px; font-size: 16px; font-weight: 600; cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary span { color: var(--brand-secondary); font-size: 13px; font-weight: 800; }
.faq-content { padding: 20px 0 0 45px; font-size: 14.5px; color: var(--text-muted); animation: slideDown 0.3s ease; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

/* ==========================================
 * 页脚
 * ========================================== */
.bottom-slogan { text-align: center; margin: 100px 0 60px; }
.bottom-slogan h3 { font-size: 24px; margin-bottom: 20px; font-weight: 500; }
.back-link { color: var(--brand-primary); font-size: 14px; text-decoration: underline; text-underline-offset: 4px; }

.social-footer { background: #07080a; padding: 60px var(--gutter) 30px; border-top: 1px solid var(--border-glass); }
.footer-content { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 40px; margin-bottom: 50px; }
.footer-brand h2 { font-size: 20px; margin-bottom: 15px; }
.footer-brand p { font-size: 13px; color: var(--text-muted); max-width: 350px; }
.footer-notice p { font-size: 12px; color: var(--brand-secondary); line-height: 2; text-align: right; }
.footer-copyright { max-width: 1200px; margin: 0 auto; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.05); display: flex; justify-content: space-between; font-size: 12px; color: #555c6b; }

/* ==========================================
 * 移动端响应式
 * ========================================== */
@media (max-width: 992px) {
  .hero-section { grid-template-columns: 1fr; text-align: center; gap: 40px; padding-top: 40px; }
  .hero-actions { justify-content: center; }
  .art-card { min-height: 380px; }
  .culture-layout { grid-template-columns: 1fr; }
  .culture-item { border-left: none; border-top: 2px solid var(--border-glass); padding-left: 0; padding-top: 25px; }
  .culture-item:first-child { border-top: none; padding-top: 0; }
  .download-wrapper { grid-template-columns: 1fr; text-align: center; padding: 40px 25px; }
  .download-info p { margin: 15px auto 0; }
}

@media (max-width: 768px) {
  .desktop-nav { display: none; }
  .hero-title { font-size: 32px; }
  .core-values-bar { flex-direction: column; gap: 30px; }
  .text-content { padding: 30px 20px; }
  .grid-cards { grid-template-columns: 1fr; }
  .vision-row { grid-template-columns: 1fr; gap: 10px; padding: 20px 0; text-align: center; }
  .faq-accordion { padding: 10px 20px; }
  .faq-content { padding-left: 0; padding-top: 15px; }
  .footer-content { flex-direction: column; }
  .footer-notice p { text-align: left; }
}