/* ==========================================================================
   Buxiayu 客户端免翻墙高速下载中心 - 3D Studio 艺术级浅灰极简设计
   设计基调：--shade: #f2f0ec, --fg: #0d0c0b, 极致自适应杜绝错版
   ========================================================================== */

:root {
  --fg: #0d0c0b;
  --fg-soft: rgba(13, 12, 11, 0.68);
  --fg-faint: rgba(13, 12, 11, 0.44);
  --shade: #f2f0ec;
  --rule: rgba(13, 12, 11, 0.09);
  --rule-strong: rgba(13, 12, 11, 0.16);

  --pill-bg: #0a0908;
  --pill-fg: #ffffff;
  --pill-hover: #22201d;

  --accent-green: #059669;
  --accent-green-bg: #ecfdf5;
  --accent-green-border: rgba(5, 150, 105, 0.25);

  --accent-blue: #2563eb;
  --accent-blue-bg: #eff6ff;
  --accent-blue-border: rgba(37, 99, 235, 0.25);

  --accent-purple: #7c3aed;
  --accent-purple-bg: #f5f3ff;
  --accent-purple-border: rgba(124, 58, 237, 0.25);

  --card-bg: rgba(255, 255, 255, 0.78);
  --card-hover: rgba(255, 255, 255, 0.95);
  --shadow-card: 0 16px 44px -8px rgba(13, 12, 11, 0.06), 0 1px 2px rgba(13, 12, 11, 0.04);
  --shadow-hover: 0 24px 60px -10px rgba(13, 12, 11, 0.1);

  --radius-card: 16px;
  --radius-btn: 999px;
  --max-width: 1180px;

  --font-sans: "Inter Tight", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  background: var(--shade);
  color: var(--fg);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  border: none;
  background: none;
}

/* ==========================================================================
   全屏 3D 动态背景视频层 & 遮罩与颗粒滤镜
   ========================================================================== */
.stage {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background: var(--shade);
  pointer-events: none;
  transform: translateZ(0);
}

.stage video {
  position: absolute;
  top: 50%;
  left: 50%;
  min-width: 100%;
  min-height: 100%;
  width: auto;
  height: auto;
  transform: translate(-50%, -50%) scale(1.02);
  object-fit: cover;
  filter: contrast(1.02);
  will-change: transform;
}

.veil {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(to bottom,
      rgba(242, 240, 236, 0.68) 0%,
      rgba(242, 240, 236, 0.16) 24%,
      rgba(242, 240, 236, 0.16) 74%,
      rgba(242, 240, 236, 0.72) 100%),
    radial-gradient(100% 80% at 50% 48%, rgba(242, 240, 236, 0) 0%, rgba(242, 240, 236, 0.35) 100%),
    rgba(242, 240, 236, 0.22);
}

.grain {
  position: absolute;
  inset: -50%;
  opacity: 0.14;
  mix-blend-mode: multiply;
  pointer-events: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='140' height='140'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/></filter><rect width='140' height='140' filter='url(%23n)' opacity='.5'/></svg>");
}

/* ==========================================================================
   容器规范
   ========================================================================== */
.container {
  width: min(var(--max-width), calc(100% - 48px));
  margin-left: auto;
  margin-right: auto;
  position: relative;
  z-index: 10;
}

.studio-card {
  background: var(--card-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--rule);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: all 0.22s ease;
}

.studio-card:hover {
  border-color: var(--rule-strong);
  box-shadow: var(--shadow-hover);
}

/* ==========================================================================
   Header 导航栏 (Fixed Chrome)
   ========================================================================== */
.chrome {
  position: sticky;
  top: 0;
  z-index: 50;
  background: linear-gradient(to bottom, rgba(242, 240, 236, 0.95) 0%, rgba(242, 240, 236, 0.8) 75%, rgba(242, 240, 236, 0) 100%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 14px 0;
  border-bottom: 1px solid rgba(13, 12, 11, 0.05);
}

.chrome-inner {
  width: min(var(--max-width), calc(100% - 48px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.mark {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--fg);
  font-size: 15px;
  min-width: 0;
}

.mark-star {
  font-size: 18px;
  opacity: 0.85;
}

.mark-text {
  display: flex;
  flex-direction: column;
}

.mark-text strong {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.mark-text small {
  font-size: 12px;
  color: var(--fg-soft);
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 28px);
}

.nav a:not(.pill) {
  color: var(--fg);
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: -0.01em;
  opacity: 0.82;
  transition: opacity 0.2s ease;
}

.nav a:not(.pill):hover {
  opacity: 1;
}

/* 经典 Pill 药丸胶囊按钮 */
.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 42px;
  padding: 0 20px;
  border-radius: var(--radius-btn);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}

.pill:hover {
  transform: translateY(-2px);
}

.pill.pill-primary {
  background: var(--pill-bg);
  color: var(--pill-fg);
  box-shadow: 0 8px 20px rgba(10, 9, 8, 0.25);
  border: 1px solid rgba(10, 9, 8, 0.12);
}

.pill.pill-primary:hover {
  background: #000000;
  box-shadow: 0 10px 26px rgba(10, 9, 8, 0.35);
}

.pill.pill-secondary {
  background: rgba(255, 255, 255, 0.85);
  color: var(--fg);
  border: 1px solid var(--rule-strong);
  box-shadow: 0 4px 14px rgba(13, 12, 11, 0.05);
}

.pill.pill-secondary:hover {
  background: #ffffff;
  border-color: rgba(13, 12, 11, 0.3);
}

.nav-pill {
  height: 38px;
  padding: 0 18px;
  background: var(--pill-bg);
  color: #ffffff;
  border: 1px solid rgba(10, 9, 8, 0.12);
}

/* ==========================================================================
   Hero 区域：居中平衡排版，自适应任何屏幕尺寸，绝不错版
   ========================================================================== */
.hero {
  padding: 60px 0 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  z-index: 10;
}

.hero-container {
  width: min(840px, 100%);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 16px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--rule-strong);
  color: var(--fg-soft);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 22px;
  box-shadow: 0 4px 14px rgba(13, 12, 11, 0.04);
}

.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 8px rgba(5, 150, 105, 0.8);
}

.hero-title {
  margin: 0;
  font-size: clamp(34px, 4.8vw, 56px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.03em;
  color: var(--fg);
}

.hero-desc {
  margin: 18px 0 0;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.75;
  color: var(--fg-soft);
  max-width: 640px;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

/* 快速支持平台条 */
.hero-quick-platforms {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  width: 100%;
}

.quick-label {
  font-size: 13px;
  color: var(--fg-faint);
}

.quick-btns {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.quick-platform-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--rule-strong);
  color: var(--fg);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.16s ease;
}

.quick-platform-btn:hover {
  background: #ffffff;
  border-color: rgba(13, 12, 11, 0.35);
  transform: translateY(-1px);
}

/* 3项核心指标水平微卡条 */
.hero-stats-row {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 32px;
  padding: 10px 24px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--rule);
  box-shadow: 0 4px 16px rgba(13, 12, 11, 0.04);
}

.stat-bubble {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.stat-bubble strong {
  font-size: 18px;
  font-weight: 700;
  color: var(--fg);
}

.stat-bubble span {
  font-size: 12.5px;
  color: var(--fg-soft);
}

.stat-bubble.highlight strong {
  color: var(--accent-green);
}

.stat-bubble-divider {
  width: 1px;
  height: 14px;
  background: var(--rule-strong);
}

/* ==========================================================================
   系统选型指南
   ========================================================================== */
.guide-panel {
  margin: 18px auto 26px;
  padding: 26px 32px;
}

.guide-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.guide-icon {
  font-size: 22px;
  color: var(--fg);
}

.guide-header h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--fg);
}

.guide-header p {
  margin: 3px 0 0;
  font-size: 13.5px;
  color: var(--fg-soft);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.guide-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  padding: 18px 20px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--rule);
  cursor: pointer;
  transition: all 0.2s ease;
}

.guide-item:hover {
  background: #ffffff;
  border-color: rgba(13, 12, 11, 0.28);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(13, 12, 11, 0.08);
}

.guide-pill {
  display: inline-flex;
  padding: 3px 9px;
  border-radius: 6px;
  font-size: 11.5px;
  font-weight: 700;
  margin-bottom: 10px;
}

.guide-pill.android {
  background: var(--accent-green-bg);
  color: var(--accent-green);
  border: 1px solid var(--accent-green-border);
}

.guide-pill.ios {
  background: #fdf2f8;
  color: #db2777;
  border: 1px solid rgba(219, 39, 119, 0.25);
}

.guide-pill.windows {
  background: var(--accent-blue-bg);
  color: var(--accent-blue);
  border: 1px solid var(--accent-blue-border);
}

.guide-pill.macos {
  background: var(--accent-purple-bg);
  color: var(--accent-purple);
  border: 1px solid var(--accent-purple-border);
}

.guide-title {
  color: var(--fg);
  font-size: 15px;
  font-weight: 700;
}

.guide-desc {
  color: var(--fg-soft);
  font-size: 12.5px;
  margin-top: 4px;
  line-height: 1.45;
}

/* ==========================================================================
   核心免翻墙下载专区（支持 5 色主题平滑联动变色）
   ========================================================================== */
.download-section-box {
  padding: 38px 40px;
  margin-bottom: 36px;
  position: relative;
  overflow: hidden;

  --theme-primary: #0d0c0b;
  --theme-gradient: linear-gradient(90deg, #0d0c0b, #475569);
  --theme-bg-tint: rgba(255, 255, 255, 0.88);
  --theme-border: var(--rule);
  --theme-soft: rgba(13, 12, 11, 0.05);
  --theme-card-border: var(--rule);
  --theme-shadow: 0 16px 44px -8px rgba(13, 12, 11, 0.06);
  --theme-btn-bg: #0a0908;
  --theme-btn-hover: #000000;
  --theme-btn-glow: rgba(10, 9, 8, 0.25);
  --theme-tag-bg: rgba(13, 12, 11, 0.06);
  --theme-tag-color: var(--fg);
  --theme-item-bg: rgba(242, 240, 236, 0.55);

  background: var(--theme-bg-tint);
  border-color: var(--theme-border);
  box-shadow: var(--theme-shadow);
  transition: background 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.download-section-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--theme-gradient);
  transition: background 0.35s ease;
}

/* 1. Android 安卓主题：清爽翡翠绿 */
#downloads[data-theme="android"] {
  --theme-primary: #059669;
  --theme-gradient: linear-gradient(90deg, #059669, #10b981 60%, #34d399);
  --theme-bg-tint: linear-gradient(180deg, rgba(236, 253, 245, 0.94) 0%, rgba(255, 255, 255, 0.97) 450px);
  --theme-border: rgba(5, 150, 105, 0.28);
  --theme-soft: rgba(5, 150, 105, 0.08);
  --theme-card-border: rgba(5, 150, 105, 0.22);
  --theme-shadow: 0 20px 50px -10px rgba(5, 150, 105, 0.14);
  --theme-btn-bg: linear-gradient(135deg, #059669, #10b981);
  --theme-btn-hover: linear-gradient(135deg, #047857, #059669);
  --theme-btn-glow: rgba(5, 150, 105, 0.35);
  --theme-tag-bg: #ecfdf5;
  --theme-tag-color: #059669;
  --theme-item-bg: rgba(236, 253, 245, 0.55);
}

/* 2. iPhone / iPad 主题：高阶时尚洋红/玫瑰粉 */
#downloads[data-theme="ios"] {
  --theme-primary: #db2777;
  --theme-gradient: linear-gradient(90deg, #db2777, #f43f5e 60%, #fb7185);
  --theme-bg-tint: linear-gradient(180deg, rgba(253, 242, 248, 0.94) 0%, rgba(255, 255, 255, 0.97) 450px);
  --theme-border: rgba(219, 39, 119, 0.28);
  --theme-soft: rgba(219, 39, 119, 0.08);
  --theme-card-border: rgba(219, 39, 119, 0.22);
  --theme-shadow: 0 20px 50px -10px rgba(219, 39, 119, 0.14);
  --theme-btn-bg: linear-gradient(135deg, #db2777, #f43f5e);
  --theme-btn-hover: linear-gradient(135deg, #be185d, #e11d48);
  --theme-btn-glow: rgba(219, 39, 119, 0.35);
  --theme-tag-bg: #fdf2f8;
  --theme-tag-color: #db2777;
  --theme-item-bg: rgba(253, 242, 248, 0.55);
}

/* 3. Windows 主题：经典科技天蓝 */
#downloads[data-theme="windows"] {
  --theme-primary: #2563eb;
  --theme-gradient: linear-gradient(90deg, #2563eb, #0284c7 60%, #38bdf8);
  --theme-bg-tint: linear-gradient(180deg, rgba(239, 246, 255, 0.94) 0%, rgba(255, 255, 255, 0.97) 450px);
  --theme-border: rgba(37, 99, 235, 0.28);
  --theme-soft: rgba(37, 99, 235, 0.08);
  --theme-card-border: rgba(37, 99, 235, 0.22);
  --theme-shadow: 0 20px 50px -10px rgba(37, 99, 235, 0.14);
  --theme-btn-bg: linear-gradient(135deg, #2563eb, #0284c7);
  --theme-btn-hover: linear-gradient(135deg, #1d4ed8, #0369a1);
  --theme-btn-glow: rgba(37, 99, 235, 0.35);
  --theme-tag-bg: #eff6ff;
  --theme-tag-color: #2563eb;
  --theme-item-bg: rgba(239, 246, 255, 0.55);
}

/* 4. macOS 主题：梦幻极光紫 */
#downloads[data-theme="macos"] {
  --theme-primary: #7c3aed;
  --theme-gradient: linear-gradient(90deg, #7c3aed, #9333ea 60%, #c084fc);
  --theme-bg-tint: linear-gradient(180deg, rgba(245, 243, 255, 0.94) 0%, rgba(255, 255, 255, 0.97) 450px);
  --theme-border: rgba(124, 58, 237, 0.28);
  --theme-soft: rgba(124, 58, 237, 0.08);
  --theme-card-border: rgba(124, 58, 237, 0.22);
  --theme-shadow: 0 20px 50px -10px rgba(124, 58, 237, 0.14);
  --theme-btn-bg: linear-gradient(135deg, #7c3aed, #9333ea);
  --theme-btn-hover: linear-gradient(135deg, #6d28d9, #7e22ce);
  --theme-btn-glow: rgba(124, 58, 237, 0.35);
  --theme-tag-bg: #f5f3ff;
  --theme-tag-color: #7c3aed;
  --theme-item-bg: rgba(245, 243, 255, 0.55);
}

.section-kicker {
  margin-bottom: 8px;
  color: var(--fg-faint);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 1.8px;
}

.section-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
}

.section-header-row h2 {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-header-row p {
  margin: 6px 0 0;
  color: var(--fg-soft);
  font-size: 14.5px;
}

.secure-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--theme-tag-bg);
  border: 1px solid var(--theme-border);
  color: var(--theme-primary);
  font-size: 12.5px;
  font-weight: 600;
  white-space: nowrap;
  transition: all 0.3s ease;
}

.secure-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--theme-primary);
  transition: background 0.3s ease;
}

/* 筛选 Tabs 栏（已删除 Linux 和 其他） */
.filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  padding: 10px 14px;
  margin-bottom: 26px;
  background: rgba(13, 12, 11, 0.035);
  border: 1px solid var(--rule);
  border-radius: 12px;
}

.filter-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 40px;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.7);
  color: var(--fg-soft);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

/* ==========================================================================
   5 个标签选项卡专属色彩定义（各具专属辨识度）
   ========================================================================== */
.tab-btn[data-platform="all"] {
  border-color: rgba(13, 12, 11, 0.16);
  color: var(--fg);
}
.tab-btn[data-platform="all"]:hover {
  background: #ffffff;
  border-color: rgba(13, 12, 11, 0.35);
}
.tab-btn[data-platform="all"].active {
  background: #0d0c0b;
  color: #ffffff;
  border-color: #0d0c0b;
  box-shadow: 0 4px 16px rgba(13, 12, 11, 0.3);
}

.tab-btn[data-platform="android"] {
  border-color: rgba(5, 150, 105, 0.28);
  color: #047857;
  background: rgba(236, 253, 245, 0.65);
}
.tab-btn[data-platform="android"]:hover {
  background: #d1fae5;
  border-color: rgba(5, 150, 105, 0.5);
}
.tab-btn[data-platform="android"].active {
  background: linear-gradient(135deg, #059669, #10b981);
  color: #ffffff;
  border-color: #059669;
  box-shadow: 0 4px 16px rgba(5, 150, 105, 0.35);
}
.tab-btn[data-platform="android"] .tab-count {
  background: rgba(5, 150, 105, 0.15);
  color: #047857;
}
.tab-btn[data-platform="android"].active .tab-count {
  background: rgba(0, 0, 0, 0.2);
  color: #ffffff;
}

.tab-btn[data-platform="ios"] {
  border-color: rgba(219, 39, 119, 0.28);
  color: #be185d;
  background: rgba(253, 242, 248, 0.7);
}
.tab-btn[data-platform="ios"]:hover {
  background: #fce7f3;
  border-color: rgba(219, 39, 119, 0.5);
}
.tab-btn[data-platform="ios"].active {
  background: linear-gradient(135deg, #db2777, #f43f5e);
  color: #ffffff;
  border-color: #db2777;
  box-shadow: 0 4px 16px rgba(219, 39, 119, 0.35);
}
.tab-btn[data-platform="ios"] .tab-count {
  background: rgba(219, 39, 119, 0.15);
  color: #be185d;
}
.tab-btn[data-platform="ios"].active .tab-count {
  background: rgba(0, 0, 0, 0.2);
  color: #ffffff;
}

.tab-btn[data-platform="windows"] {
  border-color: rgba(37, 99, 235, 0.28);
  color: #1d4ed8;
  background: rgba(239, 246, 255, 0.7);
}
.tab-btn[data-platform="windows"]:hover {
  background: #dbeafe;
  border-color: rgba(37, 99, 235, 0.5);
}
.tab-btn[data-platform="windows"].active {
  background: linear-gradient(135deg, #2563eb, #0284c7);
  color: #ffffff;
  border-color: #2563eb;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
}
.tab-btn[data-platform="windows"] .tab-count {
  background: rgba(37, 99, 235, 0.15);
  color: #1d4ed8;
}
.tab-btn[data-platform="windows"].active .tab-count {
  background: rgba(0, 0, 0, 0.2);
  color: #ffffff;
}

.tab-btn[data-platform="macos"] {
  border-color: rgba(124, 58, 237, 0.28);
  color: #6d28d9;
  background: rgba(245, 243, 255, 0.7);
}
.tab-btn[data-platform="macos"]:hover {
  background: #ede9fe;
  border-color: rgba(124, 58, 237, 0.5);
}
.tab-btn[data-platform="macos"].active {
  background: linear-gradient(135deg, #7c3aed, #9333ea);
  color: #ffffff;
  border-color: #7c3aed;
  box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
}
.tab-btn[data-platform="macos"] .tab-count {
  background: rgba(124, 58, 237, 0.15);
  color: #6d28d9;
}
.tab-btn[data-platform="macos"].active .tab-count {
  background: rgba(0, 0, 0, 0.2);
  color: #ffffff;
}

.tab-btn .tab-count {
  display: inline-grid;
  place-items: center;
  min-width: 19px;
  height: 19px;
  padding: 0 5px;
  border-radius: 999px;
  background: rgba(13, 12, 11, 0.08);
  color: var(--fg-soft);
  font-size: 11px;
  font-family: var(--font-mono);
}

.tab-btn.active .tab-count {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

.filter-status-text {
  font-size: 13px;
  color: var(--fg-soft);
}

.filter-status-text strong {
  color: var(--theme-primary);
  transition: color 0.3s ease;
}

/* ==========================================================================
   软件网格卡片 & 布局重构
   ========================================================================== */
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.project-card {
  background: var(--theme-card-bg, rgba(255, 255, 255, 0.88));
  border: 1px solid var(--theme-card-border, var(--rule));
  border-radius: 14px;
  padding: 26px 28px;
  box-shadow: 0 10px 30px rgba(13, 12, 11, 0.04);
  transition: all 0.25s ease;
}

.project-card:hover {
  border-color: var(--theme-border, var(--rule-strong));
  box-shadow: 0 16px 40px var(--theme-soft, rgba(13, 12, 11, 0.08));
}

.project-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.project-main-meta {
  flex: 1;
  min-width: 0;
}

.project-title-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 8px;
}

.project-name {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.version-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(13, 12, 11, 0.06);
  color: var(--fg-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
}

.platform-chips {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.platform-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 700;
}

.platform-chip.android {
  background: var(--accent-green-bg);
  color: var(--accent-green);
  border: 1px solid var(--accent-green-border);
}

.platform-chip.windows {
  background: var(--accent-blue-bg);
  color: var(--accent-blue);
  border: 1px solid var(--accent-blue-border);
}

.platform-chip.macos {
  background: var(--accent-purple-bg);
  color: var(--accent-purple);
  border: 1px solid var(--accent-purple-border);
}

.platform-chip.ios {
  background: rgba(13, 12, 11, 0.08);
  color: var(--fg);
  border: 1px solid var(--rule-strong);
}

.client-tag-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  background: rgba(13, 12, 11, 0.05);
  color: var(--fg-soft);
  border: 1px solid var(--rule);
}

/* ==========================================================================
   iOS 专属全局统一提示横幅（全页只出现一次）
   ========================================================================== */
.ios-global-notice {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 18px 22px;
  margin-bottom: 20px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--theme-tag-bg, #fdf2f8) 0%, rgba(255, 255, 255, 0.96) 100%);
  border: 1px solid var(--theme-border, var(--rule-strong));
  box-shadow: 0 4px 18px var(--theme-soft, rgba(13, 12, 11, 0.04));
  transition: all 0.3s ease;
}

.ios-notice-badge-icon {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: var(--theme-btn-bg, var(--pill-bg));
  color: #ffffff;
  flex: 0 0 auto;
  transition: background 0.3s ease;
}

.ios-notice-details {
  flex: 1;
  min-width: 0;
}

.ios-notice-main-line {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.ios-notice-main-line strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--fg);
}

.ios-guide-tag {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(13, 12, 11, 0.08);
  color: var(--fg);
  font-size: 11.5px;
  font-weight: 600;
}

.ios-notice-sub-line {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--fg-soft);
  line-height: 1.6;
}

.tip-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 7px;
  border-radius: 4px;
  background: #fef3c7;
  color: #b45309;
  font-size: 11.5px;
  font-weight: 700;
  border: 1px solid rgba(180, 83, 9, 0.25);
  margin-right: 6px;
}

/* ==========================================================================
   iOS 客户端单体卡片（轻量清爽，不重复长段说明，只保留便捷搜索复制）
   ========================================================================== */
.ios-client-card {
  padding: 20px 24px;
}

.ios-client-card .tutorial-banner-wrap {
  margin: 16px 0 0;
}

.ios-client-row {
  display: flex;
  align-items: center;
  gap: 20px;
}

.ios-client-index {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--fg-faint);
  flex: 0 0 28px;
  text-align: center;
}

.ios-client-main {
  flex: 1;
  min-width: 0;
}

.ios-client-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
  flex: 0 0 auto;
}

.ios-store-hint {
  font-size: 11.5px;
  color: var(--fg-faint);
  font-weight: 500;
}

.ios-search-btn {
  height: 38px;
  padding: 0 18px;
  font-size: 13px;
  background: var(--theme-btn-bg, var(--pill-bg));
  color: #ffffff;
  border: 1px solid rgba(10, 9, 8, 0.12);
  box-shadow: 0 4px 12px var(--theme-btn-glow, rgba(10, 9, 8, 0.18));
  transition: all 0.2s ease;
}

.ios-search-btn:hover {
  background: var(--theme-btn-hover, #000000);
}

.project-tagline {
  color: var(--fg);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}

.project-desc {
  margin: 0;
  color: var(--fg-soft);
  font-size: 13.5px;
  line-height: 1.6;
}

/* ==========================================================================
   教程区块：独占通栏拉长填充满，整体颜色与上方系统选项卡一致
   ========================================================================== */
.tutorial-banner-wrap {
  margin: 16px 0 20px;
}

.tutorial-banner {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 14px 20px;
  border-radius: 12px;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.tutorial-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
  transition: 0.6s ease;
  pointer-events: none;
}

.tutorial-banner:hover::before {
  left: 100%;
}

.tutorial-banner:hover {
  transform: translateY(-2px);
}

/* 1. Android 安卓教程长条（整体翡翠绿） */
.tutorial-banner.tutorial-theme-android {
  background: linear-gradient(135deg, #059669 0%, #10b981 100%);
  box-shadow: 0 8px 24px rgba(5, 150, 105, 0.28);
}
.tutorial-banner.tutorial-theme-android:hover {
  background: linear-gradient(135deg, #047857 0%, #059669 100%);
  box-shadow: 0 10px 30px rgba(5, 150, 105, 0.42);
}
.tutorial-banner.tutorial-theme-android .tutorial-action {
  color: #047857;
}

/* 2. iPhone / iPad 教程长条（整体洋红玫瑰） */
.tutorial-banner.tutorial-theme-ios {
  background: linear-gradient(135deg, #db2777 0%, #f43f5e 100%);
  box-shadow: 0 8px 24px rgba(219, 39, 119, 0.28);
}
.tutorial-banner.tutorial-theme-ios:hover {
  background: linear-gradient(135deg, #be185d 0%, #e11d48 100%);
  box-shadow: 0 10px 30px rgba(219, 39, 119, 0.42);
}
.tutorial-banner.tutorial-theme-ios .tutorial-action {
  color: #be185d;
}

/* 3. Windows 教程长条（整体科技天蓝） */
.tutorial-banner.tutorial-theme-windows {
  background: linear-gradient(135deg, #2563eb 0%, #0284c7 100%);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.28);
}
.tutorial-banner.tutorial-theme-windows:hover {
  background: linear-gradient(135deg, #1d4ed8 0%, #0369a1 100%);
  box-shadow: 0 10px 30px rgba(37, 99, 235, 0.42);
}
.tutorial-banner.tutorial-theme-windows .tutorial-action {
  color: #1d4ed8;
}

/* 4. macOS 教程长条（整体极光紫罗兰） */
.tutorial-banner.tutorial-theme-macos {
  background: linear-gradient(135deg, #7c3aed 0%, #9333ea 100%);
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.28);
}
.tutorial-banner.tutorial-theme-macos:hover {
  background: linear-gradient(135deg, #6d28d9 0%, #7e22ce 100%);
  box-shadow: 0 10px 30px rgba(124, 58, 237, 0.42);
}
.tutorial-banner.tutorial-theme-macos .tutorial-action {
  color: #6d28d9;
}

/* 教程卡片通用内部构件（适应高饱和彩色背景） */
.tutorial-badge-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
  color: #ffffff;
  flex: 0 0 auto;
}

.tutorial-body {
  flex: 1;
  min-width: 0;
}

.tutorial-main-title {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.tutorial-main-title strong {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
}

.tutorial-tag {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.24);
  color: #ffffff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.tutorial-sub {
  margin: 4px 0 0;
  color: rgba(255, 255, 255, 0.92);
  font-size: 12.5px;
  line-height: 1.4;
}

.tutorial-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 999px;
  background: #ffffff;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  flex: 0 0 auto;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
  transition: all 0.2s ease;
}

.tutorial-banner:hover .tutorial-action {
  background: #0d0c0b;
  color: #ffffff;
}

/* ==========================================================================
   下载列表清单设计
   ========================================================================== */
.download-section {
  border-top: 1px solid var(--rule);
  padding-top: 16px;
}

.download-section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.download-section-title span {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--fg-faint);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.download-section-title small {
  font-size: 12px;
  color: var(--fg-soft);
}

.download-list {
  display: grid;
  gap: 10px;
}

.download-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  padding: 13px 18px;
  border-radius: 10px;
  background: var(--theme-item-bg, rgba(242, 240, 236, 0.55));
  border: 1px solid var(--theme-card-border, var(--rule));
  transition: all 0.2s ease;
}

.download-item:hover {
  background: #ffffff;
  border-color: var(--theme-border, var(--rule-strong));
  transform: translateX(2px);
  box-shadow: 0 6px 18px var(--theme-soft, rgba(13, 12, 11, 0.05));
}

.download-item.is-recommended {
  border-left: 3px solid var(--theme-primary, var(--accent-green));
}

.file-main {
  flex: 1;
  min-width: 260px;
}

.file-header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.file-platform-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
}

.file-platform-badge.android {
  background: var(--accent-green-bg);
  color: var(--accent-green);
}

.file-platform-badge.windows {
  background: var(--accent-blue-bg);
  color: var(--accent-blue);
}

.file-platform-badge.macos {
  background: var(--accent-purple-bg);
  color: var(--accent-purple);
}

.file-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--fg);
  word-break: break-word;
}

.pill-recommended {
  display: inline-flex;
  align-items: center;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--accent-green-bg);
  border: 1px solid var(--accent-green-border);
  color: var(--accent-green);
  font-size: 11px;
  font-weight: 700;
}

.file-meta-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 5px;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(13, 12, 11, 0.05);
  color: var(--fg-soft);
  font-family: var(--font-mono);
  font-size: 11px;
}

.meta-note {
  font-size: 12px;
  color: var(--fg-soft);
}

.download-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.primary-download {
  min-height: 38px;
  padding: 8px 16px;
  border-radius: var(--radius-btn);
  background: var(--theme-btn-bg, var(--pill-bg));
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid rgba(10, 9, 8, 0.15);
  box-shadow: 0 4px 12px var(--theme-btn-glow, rgba(10, 9, 8, 0.2));
  transition: all 0.2s ease;
}

.primary-download:hover {
  background: var(--theme-btn-hover, #000000);
  box-shadow: 0 6px 16px var(--theme-btn-glow, rgba(10, 9, 8, 0.3));
}

.copy-btn {
  min-height: 38px;
  padding: 8px 14px;
  border-radius: var(--radius-btn);
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--rule-strong);
  color: var(--fg-soft);
  font-size: 13px;
  font-weight: 600;
}

.copy-btn:hover {
  background: #ffffff;
  color: var(--fg);
  border-color: rgba(13, 12, 11, 0.3);
}

/* 空状态 */
.empty-state {
  padding: 44px 20px;
  text-align: center;
  border: 1px dashed var(--rule-strong);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.5);
}

.empty-icon {
  font-size: 32px;
  margin-bottom: 10px;
}

.empty-state h3 {
  margin: 0;
  color: var(--fg);
  font-size: 17px;
}

.empty-state p {
  margin: 6px 0 18px;
  color: var(--fg-soft);
  font-size: 13.5px;
}

/* ==========================================================================
   更新日志与说明模块
   ========================================================================== */
.content-card {
  padding: 32px 36px;
  margin-bottom: 28px;
}

.content-head {
  margin-bottom: 20px;
}

.content-head h2 {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
}

.content-head p {
  margin: 5px 0 0;
  color: var(--fg-soft);
  font-size: 13.5px;
}

.update-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.update-card {
  padding: 18px;
  border-radius: 12px;
  background: rgba(242, 240, 236, 0.6);
  border: 1px solid var(--rule);
}

.update-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}

.update-card-header h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
}

.update-version {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--fg-soft);
  font-weight: 600;
}

.update-ul {
  margin: 0;
  padding-left: 18px;
  color: var(--fg-soft);
  font-size: 12.5px;
  line-height: 1.65;
}

.update-empty {
  margin: 0;
  color: var(--fg-faint);
  font-size: 12.5px;
}

.qa-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.qa-item {
  padding: 16px 18px;
  border-radius: 12px;
  background: rgba(242, 240, 236, 0.6);
  border: 1px solid var(--rule);
}

.qa-q {
  display: block;
  font-size: 13.5px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--fg);
}

.qa-item p {
  margin: 0;
  color: var(--fg-soft);
  font-size: 12.5px;
  line-height: 1.55;
}

.studio-notice {
  padding: 14px 18px;
  border-radius: 10px;
  background: rgba(13, 12, 11, 0.04);
  border: 1px solid var(--rule);
  color: var(--fg-soft);
  font-size: 13px;
  line-height: 1.6;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  padding: 36px 0 48px;
  border-top: 1px solid var(--rule);
  margin-top: 48px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand strong {
  display: block;
  color: var(--fg);
  font-size: 14.5px;
  font-weight: 700;
}

.footer-brand p {
  margin: 3px 0 0;
  color: var(--fg-soft);
  font-size: 12.5px;
}

.footer-copy {
  color: var(--fg-faint);
  font-size: 12.5px;
}

/* ==========================================================================
   Toast 提示
   ========================================================================== */
.copy-toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%) translateY(20px);
  opacity: 0;
  pointer-events: none;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--pill-bg);
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
  box-shadow: 0 14px 32px rgba(10, 9, 8, 0.28);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 100;
}

.copy-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ==========================================================================
   响应式断点适配（杜绝错版）
   ========================================================================== */
@media (max-width: 1024px) {
  .guide-grid,
  .update-grid,
  .qa-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .container,
  .chrome-inner {
    width: calc(100% - 32px);
  }

  .nav a:not(.pill) {
    display: none;
  }

  .hero {
    padding: 40px 0 24px;
  }

  .hero-title {
    font-size: 30px;
  }

  .download-section-box,
  .guide-panel,
  .content-card {
    padding: 22px 20px;
  }

  .section-header-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-header-row h2 {
    font-size: 22px;
  }

  .filter-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .filter-tabs {
    width: 100%;
  }

  .tutorial-banner {
    flex-direction: column;
    align-items: flex-start;
  }

  .tutorial-action {
    width: 100%;
    justify-content: center;
  }

  .download-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .download-actions {
    width: 100%;
  }

  .download-actions .btn,
  .download-actions .pill {
    flex: 1;
    text-align: center;
  }

  .ios-global-notice {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 18px;
  }

  .ios-client-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .ios-client-index {
    display: none;
  }

  .ios-client-actions {
    width: 100%;
    align-items: flex-start;
  }

  .ios-search-btn {
    width: 100%;
  }

  .mark-text small {
    display: none;
  }
}