/**
 * 恋爱时光轴 & 漫游宇宙 (Love Universe)
 * 文件名: css/base.css
 * 版本: 2.4 — 滚动锁死修复版
 * 
 * 【根因修复记录】
 * 致命Bug: overscroll-behavior:contain + 全局section/main overflow-x:hidden 
 *         叠加导致滚动链在main-container处被完全截断
 * 修复方案: 移除contain、收束overflow约束到html/body层级、恢复标准滚动链
 */

:root {
  --primary-pink: #f43f5e;
  --primary-pink-hover: #e11d48;
  --rose-gold: #fb7185;
  --rose-gold-glow: rgba(251, 113, 133, 0.35);
  
  --sun-gold: #f59e0b;
  --sun-gold-glow: rgba(245, 158, 11, 0.35);
  --warm-amber: #fef3c7;

  --space-dark: #070a14;
  --space-navy: #0b1120;
  --space-card: rgba(20, 20, 38, 0.72);
  
  --glass-border: rgba(255, 255, 255, 0.14);
  --glass-shine: rgba(255, 255, 255, 0.25);
  --glass-shadow: 0 16px 36px -8px rgba(0, 0, 0, 0.6);
  
  --polaroid-paper: #ffffff;
  --polaroid-shadow: 0 12px 28px rgba(0, 0, 0, 0.35), 0 4px 10px rgba(0, 0, 0, 0.2);
  
  --text-pure: #ffffff;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dark: #1f2937;
  
  --stamp-red: #dc2626;
  --stamp-red-glow: rgba(220, 38, 38, 0.4);
  --success-green: #10b981;
  
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ════════════ 全局重置 ════════════ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

/* ════════════ HTML 根元素 — 仅做横向溢出防护，不干预纵向滚动链 ════════════ */
html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background-color: var(--space-dark);
  width: 100%;
  max-width: 100%;
  /* 仅防止横向溢出，不设overscroll-behavior避免截断滚动链 */
  overflow-x: hidden;
  position: relative;
}

/* ════════════ BODY — 页面级滚动容器（标准文档流滚动） ════════════ */
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  background-color: var(--space-dark);
  color: var(--text-main);
  min-height: 100vh;
  min-height: 100dvh;
  width: 100%;
  max-width: 100%;
  /* 横向溢出防护 */
  overflow-x: hidden;
  /* 纵向保持默认auto，允许正常文档流滚动 */
  overflow-y: auto;
  position: relative;
  line-height: 1.6;
  /* 底部安全区域内边距，确保footer可完整滚动到视口 */
  padding-bottom: max(80px, env(safe-area-inset-bottom));
  /* iOS Safari 原生平滑惯性滚动（关键：不设overscroll-behavior避免锁死） */
  -webkit-overflow-scrolling: touch;
  /* 触摸手势仅限制为纵向（不阻止滚动本身） */
  touch-action: pan-y;
}

/* ════════════ 独立硬件加速全视口固定背景层 ════════════ */
.universe-bg-layer {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  height: 100dvh;
  z-index: -10;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  pointer-events: none;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
  will-change: transform, background-image;
  transition: background-image 0.4s ease;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  user-select: none;
  -webkit-user-drag: none;
}

button, input, textarea {
  font-family: inherit;
  outline: none;
  border: none;
  background: none;
}

/* 默认基底色 */
.universe-body {
  background-color: var(--space-dark);
}

/* ════════════ 主内容区 — 不设overscroll-behavior:contain（关键修复） ════════════ */
.main-container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 18px 40px;
  position: relative;
  z-index: 10;
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s var(--ease-spring), transform 0.6s var(--ease-spring);
  /* 仅防横向溢出，不触发布局上下文变更 */
  overflow-x: hidden;
  /* 不设 overflow-y — 让内容自然撑开高度参与文档流滚动 */
  /* 不设 overscroll-behavior:contain — 这是之前导致滚动锁死的元凶 */
  /* 不设 touch-action — 继承body的pan-y即可 */
}

.main-container--hidden {
  opacity: 0;
  transform: translateY(30px);
  pointer-events: none;
  display: none;
}

/* ════════════ Section标题样式 ════════════ */
.section-title {
  text-align: center;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.section-title__icon {
  font-size: 28px;
  filter: drop-shadow(0 0 10px var(--rose-gold-glow));
}

.section-title__text {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, #ffffff 0%, #fde68a 50%, #fb7185 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 20px rgba(251, 113, 133, 0.3);
}

.section-title__desc {
  font-size: 12.5px;
  color: var(--text-muted);
  font-weight: 600;
}

/* ════════════ 自定义滚动条样式 ════════════ */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: rgba(7, 10, 20, 0.8);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--rose-gold), var(--primary-pink));
  border-radius: 6px;
  box-shadow: 0 0 8px var(--rose-gold-glow);
}

/* Firefox 滚动条 */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--rose-gold) rgba(7, 10, 20, 0.8);
}

/* ════════════ 交互元素触摸优化（仅按钮级别，不影响滚动容器） ════════════ */
a, button, [role="button"] {
  touch-action: manipulation;
}