/* ============================================================
   视频提取 - 网页版样式
   方向:Apple/小米极简 + Apple 系统蓝
   Signature:卡片浮起质感 / Hero 字距工艺 / 按钮蓝色光晕 / 箭头方向感
   2026-07-27 v2:精致化修正(从「空容器」到「有质感」)

   受保护(不可改名):所有 id、.btn-label、.btn-loading、body[data-state]
   ============================================================ */

:root {
  /* 主色 - Apple 系统蓝 */
  --color-primary: #0071E3;
  --color-primary-hover: #0077ED;
  --color-primary-pressed: #006EDB;
  --color-primary-light: rgba(0,113,227,0.08);
  --color-primary-15: rgba(0,113,227,0.15);

  /* 语义色 - Apple 系统色 */
  --color-accent: #34C759;
  --color-accent-hover: #2DBE4F;
  --color-accent-light: rgba(52,199,89,0.10);
  --color-error: #FF3B30;
  --color-error-light: rgba(255,59,48,0.08);
  --color-warn: #FF9500;
  --color-warn-light: rgba(255,149,0,0.10);

  /* 中性 - Apple 标准灰阶 */
  --color-text: #1D1D1F;
  --color-text-secondary: #6E6E73;
  --color-text-tertiary: #86868B;
  --color-text-disabled: #C7C7CC;
  --color-border: #D2D2D7;
  --color-border-soft: #F2F2F4;
  --color-bg: #FFFFFF;
  --color-bg-soft: #F5F5F7;

  /* 圆角 - Apple 标准 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 22px;
  --radius-pill: 980px;

  /* 阴影 - 三层:中性极浅 / 蓝色光晕 / 卡片浮起 */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.05), 0 8px 24px rgba(0,0,0,0.05);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.06), 0 16px 40px rgba(0,0,0,0.08);
  --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 24px 48px rgba(0,0,0,0.06);
  --shadow-cta: 0 4px 14px rgba(0,113,227,0.28), 0 2px 6px rgba(0,113,227,0.16);
  --shadow-cta-hover: 0 6px 20px rgba(0,113,227,0.36), 0 2px 6px rgba(0,113,227,0.20);

  /* 时长 / 缓动 */
  --duration-fast: 150ms;
  --duration-mid: 250ms;
  --duration-slow: 400ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Cascadia Code", Consolas, monospace;

  /* 箭头 icon(内联 SVG,白) */
  --icon-arrow: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none'><path d='M6 4l4 4-4 4' stroke='%23fff' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/></svg>");
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

[hidden] {
  display: none !important;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  /* v2:浅灰底 — 让白色 container 卡片浮起(Apple 产品页经典做法) */
  background: var(--color-bg-soft);
  font-size: 15px;
  line-height: 1.5;
  letter-spacing: -0.003em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "tnum" on;
  min-height: 100vh;
}

/* ============================================================
   Container — 桌面端:白卡浮起 / 移动端:铺满
   ============================================================ */
.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 36px 28px 28px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 28px;
  background: var(--color-bg);
}

/* 桌面端 ≥560px:卡片化(浮起质感) */
@media (min-width: 560px) {
  body {
    padding: 32px 16px;
  }
  .container {
    min-height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card);
    padding: 48px 36px 36px;
    margin: 0 auto;
  }
}

/* ============================================================
   Header — Hero 字号 + Logo 重构比例
   ============================================================ */
.header {
  text-align: center;
  padding: 8px 0 12px;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 11px;
}

/* Logo SVG:Apple App Store icon 比例 — 32×32 圆角方块 + 居中三角 */
.logo svg {
  display: block;
  width: 32px;
  height: 32px;
  /* 微妙阴影让 logo 立住(蓝色 logo 自带光感,不需要 drop-shadow) */
  filter: none;
}

/* Hero:大字 + 紧字距(Apple 标志性 -0.025em 大字号字距) */
.logo h1 {
  font-size: 30px;
  margin: 0;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.025em;
  line-height: 1.1;
}

/* 副标题:小字 + 灰色 + 微松字距(保证可读性) */
.subtitle {
  margin: 10px auto 0;
  color: var(--color-text-secondary);
  font-size: 13px;
  letter-spacing: 0.01em;
  font-weight: 400;
}

/* ============================================================
   Input 区 — focus 光晕 + 主 CTA 蓝色阴影 + 箭头
   ============================================================ */
.input-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
}

.url-input {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-size: 15px;
  line-height: 1.5;
  resize: none;
  outline: none;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: inherit;
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
}

.url-input::placeholder {
  color: var(--color-text-tertiary);
  font-weight: 400;
}

.url-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-light);
}

/* ============================================================
   主 CTA — Apple 蓝 + 蓝色光晕阴影 + 右箭头方向感
   ============================================================ */
.btn-primary {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: var(--color-primary);
  color: #fff;
  font-size: 16px;
  font-weight: 500;
  /* 右侧 padding 多给 24px 让箭头有位置 */
  padding: 15px 56px 15px 20px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--duration-fast), transform var(--duration-fast), box-shadow var(--duration-fast);
  /* v2 新增:蓝色光晕阴影 — 立刻有「可点击」质感 */
  box-shadow: var(--shadow-cta);
  overflow: hidden;
  font-family: inherit;
  letter-spacing: -0.01em;
  margin-top: 4px;
}

/* 右箭头:绝对定位 + SVG 内联,不破坏 .btn-label 结构 */
.btn-primary::after {
  content: "";
  position: absolute;
  right: 20px;
  top: 50%;
  width: 16px;
  height: 16px;
  background-image: var(--icon-arrow);
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  transform: translateY(-50%);
  transition: transform var(--duration-fast);
  pointer-events: none;
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-cta-hover);
}

/* hover 时箭头微右移 2px(方向感反馈) */
.btn-primary:hover:not(:disabled)::after {
  transform: translateY(-50%) translateX(2px);
}

.btn-primary:active:not(:disabled) {
  transform: scale(0.985);
  background: var(--color-primary-pressed);
  box-shadow: 0 2px 8px rgba(0,113,227,0.20);
}

.btn-primary:disabled {
  background: var(--color-bg-soft);
  color: var(--color-text-disabled);
  cursor: not-allowed;
  box-shadow: none;
}

.btn-primary:disabled::after {
  /* disabled 态隐藏箭头(避免无方向感的死按钮带箭头很怪) */
  opacity: 0;
}

/* 辅助按钮 — Apple 文字按钮(无边框,hover 时浅蓝背景胶囊) */
.input-actions {
  display: flex;
  gap: 4px;
  justify-content: center;
  margin-top: 2px;
}

.btn-text {
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  font-size: 13px;
  font-weight: 400;
  cursor: pointer;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  transition: all var(--duration-fast);
  font-family: inherit;
}

.btn-text:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.error-msg {
  margin: 4px 0 0;
  padding: 10px 14px;
  background: var(--color-error-light);
  color: var(--color-error);
  border-left: 3px solid var(--color-error);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  text-align: left;
}

/* ============================================================
   Result — 结果卡片(去掉入场扫光,保留 fade-in)
   ============================================================ */
.result-section {
  animation: fade-in var(--duration-slow) var(--ease-out);
}

.result-card {
  position: relative;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow: hidden;
}

.result-cover-wrap {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
}

.result-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.result-cover-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.5);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.result-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: relative;
  z-index: 1;
  padding: 0 4px;
}

.result-title {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.result-author {
  margin: 0;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 500;
}

.result-size {
  margin: 0;
  color: var(--color-text-tertiary);
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0;
}

.result-video {
  width: 100%;
  max-height: 400px;
  border-radius: var(--radius-md);
  background: #000;
  position: relative;
  z-index: 1;
}

/* 保存按钮 — 同主 CTA:蓝色光晕 + 箭头 */
.btn-save {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: var(--color-primary);
  color: #fff;
  font-size: 16px;
  font-weight: 500;
  padding: 15px 56px 15px 20px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--duration-fast), transform var(--duration-fast), box-shadow var(--duration-fast);
  box-shadow: var(--shadow-cta);
  overflow: hidden;
  font-family: inherit;
  letter-spacing: -0.01em;
  z-index: 1;
  margin-top: 4px;
}

.btn-save::after {
  content: "";
  position: absolute;
  right: 20px;
  top: 50%;
  width: 16px;
  height: 16px;
  background-image: var(--icon-arrow);
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  transform: translateY(-50%);
  transition: transform var(--duration-fast);
  pointer-events: none;
}

.btn-save:hover:not(:disabled) {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-cta-hover);
}

.btn-save:hover:not(:disabled)::after {
  transform: translateY(-50%) translateX(2px);
}

.btn-save:active:not(:disabled) {
  transform: scale(0.985);
  background: var(--color-primary-pressed);
  box-shadow: 0 2px 8px rgba(0,113,227,0.20);
}

.btn-save:disabled {
  background: var(--color-bg-soft);
  color: var(--color-text-disabled);
  cursor: not-allowed;
  box-shadow: none;
}

.btn-save:disabled::after {
  opacity: 0;
}

.disclaimer {
  margin: 0;
  text-align: center;
  font-size: 12px;
  color: var(--color-text-tertiary);
  padding: 4px 0;
  position: relative;
  z-index: 1;
  line-height: 1.5;
}

/* ============================================================
   广告位
   ============================================================ */
.ad-slot {
  min-height: 60px;
  background: var(--color-bg-soft);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-tertiary);
  font-size: 12px;
  border: 1px dashed var(--color-border);
  letter-spacing: 0.02em;
}

.ad-slot:empty::before {
  content: "广告位";
}

/* ============================================================
   Footer — hairline 分割 + 居中链接
   ============================================================ */
.footer {
  text-align: center;
  padding: 16px 0 4px;
  font-size: 12px;
  color: var(--color-text-tertiary);
  letter-spacing: 0;
  margin-top: auto;
  border-top: 1px solid var(--color-border-soft);
}

.footer a {
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  transition: all var(--duration-fast);
}

.footer a:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.footer .sep {
  margin: 0 2px;
  color: var(--color-border);
}

/* ============================================================
   微信内嵌提示 — Apple 风弹窗
   ============================================================ */
.wechat-tip {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
  animation: fade-in var(--duration-mid) var(--ease-out);
}

.wechat-tip-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px 24px 20px;
  max-width: 320px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.wechat-tip-card h3 {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.wechat-tip-card p {
  margin: 0 0 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

.wechat-tip-card .btn-text {
  display: inline-flex;
  align-items: center;
  padding: 10px 28px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-cta);
}

.wechat-tip-card .btn-text:hover {
  background: var(--color-primary-hover);
  color: #fff;
}

/* ============================================================
   Animations
   ============================================================ */
@keyframes fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .result-section,
  .wechat-tip {
    animation: none;
  }
}

/* ============================================================
   State-based UI — body[data-state] 是 app.js 维护的状态机
   ============================================================ */
body[data-state="loading"] .url-input {
  background: var(--color-bg-soft);
  border-color: var(--color-border);
}

body[data-state="error"] .url-input {
  border-color: var(--color-error);
  box-shadow: 0 0 0 4px var(--color-error-light);
}

/* ============================================================
   加载动画(预留)
   ============================================================ */
.loading-dots::after {
  content: "···";
  display: inline-block;
  animation: dots 1.4s infinite;
  width: 1.5em;
  text-align: left;
}

@keyframes dots {
  0%, 20% { content: "·"; }
  40% { content: "··"; }
  60%, 100% { content: "···"; }
}