/* ============================================================
   QB音乐 项目主页 — 样式表 v3.2
   设计方向：暗色工业风 × 音乐律动感 × 沉浸式交互
   ============================================================ */

/* ===== CSS Variables ===== */
:root {
  --bg: #0a0a0f;
  --bg-elevated: #111118;
  --bg-card: #14141e;
  --bg-hover: #1a1a28;
  --border: #1e1e2e;
  --border-hover: #2a2a40;
  --text: #e2e2ea;
  --text-secondary: #8686a0;
  --text-muted: #585870;
  --accent: #ff6b4a;
  --accent-glow: rgba(255, 107, 74, 0.15);
  --accent-light: #ff8a6f;
  --green: #4ade80;
  --blue: #60a5fa;
  --purple: #a78bfa;
  --yellow: #fbbf24;
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 16px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font-display: 'SmileySans', 'Segoe UI Variable Display', 'Segoe UI Semibold', 'HarmonyOS Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'Cascadia Code', 'SF Mono', 'Fira Code', 'Consolas', monospace;
  --font-sans: 'Segoe UI Variable Text', 'Segoe UI', 'HarmonyOS Sans SC', 'MiSans', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

/* ===== Font Imports ===== */
/* 说明：不使用外部字体 CDN（Google Fonts 在国内不可用，会导致部分电脑加载卡顿），
   标题使用本地自托管的开源字体「得意黑 SmileySans」（OFL 协议，可免费商用与嵌入），
   其余回退到系统字体栈，保证任何网络环境下都能正常显示。 */
/* 得意黑 SmileySans（OFL 1.1，允许网页嵌入与商用） */
@font-face {
  font-family: 'SmileySans';
  src: url('../fonts/SmileySans-Oblique.woff2') format('woff2');
  font-weight: 100 900;   /* 声明全字重范围，任意字重请求都命中该文件 */
  font-display: swap;     /* 字体未加载完成时先用系统字体占位，避免文字不可见 */
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 80px;
}
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-secondary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  cursor: default;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ===== Selection ===== */
::selection {
  background: rgba(255, 107, 74, 0.3);
  color: var(--text);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

/* ===== Preloader ===== */
#preloader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 32px;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}
#preloader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.preloader-eq {
  display: flex;
  gap: 4px;
  align-items: flex-end;
  height: 48px;
}
.preloader-eq b {
  width: 5px;
  border-radius: 3px;
  background: var(--accent);
  animation: preEq 0.8s ease-in-out infinite alternate;
}
.preloader-eq b:nth-child(1) { height: 20px; animation-delay: 0s; }
.preloader-eq b:nth-child(2) { height: 36px; animation-delay: 0.12s; }
.preloader-eq b:nth-child(3) { height: 24px; animation-delay: 0.24s; }
.preloader-eq b:nth-child(4) { height: 48px; animation-delay: 0.36s; }
.preloader-eq b:nth-child(5) { height: 28px; animation-delay: 0.48s; }
.preloader-eq b:nth-child(6) { height: 40px; animation-delay: 0.6s; }
.preloader-eq b:nth-child(7) { height: 18px; animation-delay: 0.72s; }
@keyframes preEq {
  0% { transform: scaleY(0.3); opacity: 0.5; }
  100% { transform: scaleY(1); opacity: 1; }
}
.preloader-text {
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.15em;
  animation: prePulse 1.5s ease-in-out infinite;
}
@keyframes prePulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ===== Ambient Background ===== */
.ambient-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.04;
  animation: orbFloat 20s ease-in-out infinite;
}
.ambient-orb:nth-child(1) {
  width: 600px; height: 600px;
  background: var(--accent);
  top: -100px; left: -100px;
  animation-delay: 0s;
}
.ambient-orb:nth-child(2) {
  width: 500px; height: 500px;
  background: var(--blue);
  bottom: -100px; right: -100px;
  animation-delay: -7s;
}
.ambient-orb:nth-child(3) {
  width: 400px; height: 400px;
  background: var(--purple);
  top: 50%; left: 50%;
  animation-delay: -14s;
}
@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(40px, -30px) scale(1.1); }
  50% { transform: translate(-20px, 20px) scale(0.9); }
  75% { transform: translate(30px, 40px) scale(1.05); }
}

/* ===== Noise Texture Overlay ===== */
.noise-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.015;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 256px;
}

/* ===== Grid Line Pattern ===== */
.grid-lines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.03;
  background-image:
    linear-gradient(rgba(255,255,255,0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.1) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ===== Waveform Canvas ===== */
#waveformCanvas {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 200px;
  pointer-events: none;
  z-index: 1;
  opacity: 0.06;
}

/* ===== Floating Music Notes ===== */
#notesContainer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 3;
  overflow: hidden;
}
.floating-note {
  position: absolute;
  font-size: 24px;
  color: var(--accent);
  opacity: 0;
  animation: noteFloat 6s linear forwards;
  user-select: none;
}
.floating-note.alt { color: var(--purple); font-size: 18px; }
.floating-note.alt2 { color: var(--blue); font-size: 20px; }
@keyframes noteFloat {
  0% {
    opacity: 0;
    transform: translateY(0) rotate(0deg) scale(0.5);
  }
  10% { opacity: 0.6; }
  80% { opacity: 0.4; }
  100% {
    opacity: 0;
    transform: translateY(-400px) rotate(30deg) scale(1);
  }
}

/* ===== Layout ===== */
.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
  z-index: 2;
}

/* ===== Scroll Reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-d1 { transition-delay: 0.06s; }
.reveal-d2 { transition-delay: 0.12s; }
.reveal-d3 { transition-delay: 0.18s; }
.reveal-d4 { transition-delay: 0.24s; }
.reveal-d5 { transition-delay: 0.3s; }
.reveal-d6 { transition-delay: 0.36s; }
.reveal-d7 { transition-delay: 0.42s; }
.reveal-d8 { transition-delay: 0.48s; }

/* ===== Top Bar ===== */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s, box-shadow 0.3s;
}
.topbar.scrolled {
  background: rgba(10, 10, 15, 0.95);
  border-bottom-color: rgba(255, 255, 255, 0.06);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.03);
}
.topbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
  letter-spacing: -0.01em;
}
.topbar-logo img {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}
.topbar-links {
  display: flex;
  gap: 32px;
  font-size: 14px;
}
.topbar-links a {
  color: var(--text-muted);
  transition: color 0.2s;
  position: relative;
  font-weight: 500;
}
.topbar-links a:hover { color: var(--text); }
.topbar-links a.active { color: var(--accent-light); }
.topbar-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
}
.topbar-gh {
  font-size: 13px;
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-weight: 500;
  transition: all var(--transition);
}
.topbar-gh:hover {
  border-color: var(--border-hover);
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
}

/* ===== 镜像站提示横幅（仅 Cloudflare Pages 镜像显示） ===== */
.mirror-banner {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 101;               /* 高于 topbar 的 100 */
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 48px;            /* 左右留出关闭按钮与边缘间距 */
  background: linear-gradient(90deg, #ff6b4a, #a78bfa);
  color: #fff;
  font-size: 13px;
}
.mirror-banner[hidden] { display: none; }
/* 横幅出现时，将固定导航整体下移，避免互相遮挡 */
body.has-mirror-banner .topbar { top: 40px; }
.mirror-banner-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 100%;
  min-width: 0;
}
.mirror-badge {
  flex: none;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.22);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.02em;
}
.mirror-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mirror-link {
  flex: none;
  color: #fff;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity 0.2s;
}
.mirror-link:hover { opacity: 0.85; }
.mirror-close {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  color: #fff;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s;
}
.mirror-close:hover { background: rgba(255, 255, 255, 0.32); }
/* 移动端：横幅文字收紧 */
@media (max-width: 560px) {
  .mirror-banner { padding: 0 40px; font-size: 12px; }
  .mirror-text { max-width: 46vw; }
}

/* ===== 语言切换控件 ===== */
.lang-switch {
  position: relative;
  display: flex;
  align-items: center;
  gap: 6px;
  margin-right: 14px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  transition: all var(--transition);
}
.lang-switch:hover {
  border-color: var(--border-hover);
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
}
.lang-icon { width: 15px; height: 15px; flex: none; }
.lang-arrow { width: 11px; height: 11px; flex: none; transition: transform 0.2s; }
.lang-switch.open .lang-arrow { transform: rotate(180deg); }
.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 128px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px;
  display: none;
  flex-direction: column;
  gap: 2px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
  z-index: 200;
}
.lang-switch.open .lang-menu { display: flex; }
.lang-menu button {
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 13px;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.lang-menu button:hover { background: var(--bg-hover); color: var(--text); }
.lang-menu button.active { color: var(--accent-light); }

/* ===== Hero Section ===== */
.hero {
  padding: 160px 0 100px;
  display: flex;
  align-items: center;
  gap: 80px;
  position: relative;
}
.hero-left { flex: 1; min-width: 0; }
.hero-left .ver {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--accent-light);
  border: 1px solid rgba(255, 107, 74, 0.2);
  background: rgba(255, 107, 74, 0.06);
  padding: 3px 12px;
  border-radius: 20px;
  margin-bottom: 24px;
  letter-spacing: 0.04em;
  font-weight: 500;
}
.hero-left .ver::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}
.hero-left h1 {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text) 0%, var(--text) 60%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-left h1 em {
  font-style: italic;
  background: linear-gradient(135deg, var(--accent-light), var(--accent), var(--yellow));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-left .subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 440px;
  margin-bottom: 8px;
  line-height: 1.7;
}
.typewriter-wrap {
  display: inline-block;
  min-height: 22px;
  margin-bottom: 32px;
}
.typewriter-wrap .typewriter-text {
  font-size: 14px;
  color: var(--text-muted);
}
.typewriter-wrap .cursor {
  display: inline-block;
  width: 1px;
  height: 15px;
  background: var(--accent);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}
.hero-btns {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.hero-btns a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: all var(--transition);
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(255, 107, 74, 0.25);
  position: relative;
  overflow: hidden;
}
.btn-primary::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
  transform: rotate(45deg) translateX(-100%);
  transition: none;
}
.btn-primary:hover::after {
  animation: btnShine 0.6s ease forwards;
}
@keyframes btnShine {
  to { transform: rotate(45deg) translateX(100%); }
}
.btn-primary:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255, 107, 74, 0.35);
}
.btn-primary:active { transform: translateY(0); }
.btn-secondary {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

/* Hero Right — App Screenshot */
.hero-right {
  flex: 0 0 500px;
  position: relative;
  perspective: 1000px;
}
.hero-right .tilt-wrapper {
  transform-style: preserve-3d;
  transition: transform 0.1s ease-out;
}
.hero-right::before {
  content: '';
  position: absolute;
  inset: -20px;
  background: radial-gradient(ellipse at center, var(--accent-glow), transparent 70%);
  border-radius: 24px;
  z-index: 0;
}
.app-window {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  z-index: 1;
  box-shadow:
    0 30px 80px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.04),
    0 0 120px rgba(255, 107, 74, 0.03);
  transition: box-shadow 0.3s;
}
.hero-right:hover .app-window {
  box-shadow:
    0 35px 90px rgba(0, 0, 0, 0.55),
    0 0 0 1px rgba(255, 255, 255, 0.06),
    0 0 160px rgba(255, 107, 74, 0.06);
}
.window-bar {
  height: 36px;
  background: #0c0c16;
  display: flex;
  align-items: center;
  padding: 0 14px;
  gap: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.window-bar .dot { width: 10px; height: 10px; border-radius: 50%; }
.window-bar .dot:nth-child(1) { background: #ff5f57; }
.window-bar .dot:nth-child(2) { background: #febc2e; }
.window-bar .dot:nth-child(3) { background: #28c840; }
.window-bar .win-title {
  flex: 1;
  text-align: center;
  font-size: 11px;
  color: var(--text-muted);
  margin-right: 36px;
  font-weight: 500;
}
.window-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.win-tabs {
  display: flex;
  gap: 6px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.win-tab {
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 12px;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
  cursor: pointer;
  transition: all var(--transition);
  font-weight: 500;
}
.win-tab.on {
  background: var(--accent);
  color: #fff;
}
.win-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}
.win-row .cov {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  flex-shrink: 0;
}
.win-row .info { flex: 1; min-width: 0; }
.win-row .info .n {
  height: 10px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  margin-bottom: 5px;
}
.win-row .info .a {
  height: 7px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 3px;
  width: 60%;
}
.win-row .dur {
  width: 30px;
  height: 7px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 3px;
}
.win-player {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-sm);
  margin-top: 4px;
}
.win-player .pc {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: var(--accent);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.win-player .pc::after {
  content: '';
  width: 0;
  height: 0;
  border-left: 12px solid #fff;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  margin-left: 3px;
}
.win-player .pi { flex: 1; }
.win-player .pi .pn {
  height: 10px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
  margin-bottom: 5px;
  width: 50%;
}
.win-player .pi .pa {
  height: 7px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 3px;
  width: 35%;
}
/* Equalizer bars */
.win-player .eq {
  display: flex;
  gap: 2px;
  align-items: flex-end;
  height: 20px;
  margin-right: 10px;
}
.win-player .eq b {
  width: 3px;
  background: var(--accent);
  border-radius: 2px;
  animation: eqBounce 0.7s ease-in-out infinite alternate;
}
.win-player .eq b:nth-child(1) { height: 50%; animation-delay: 0s; }
.win-player .eq b:nth-child(2) { height: 100%; animation-delay: 0.15s; }
.win-player .eq b:nth-child(3) { height: 35%; animation-delay: 0.3s; }
.win-player .eq b:nth-child(4) { height: 75%; animation-delay: 0.1s; }
.win-player .eq b:nth-child(5) { height: 45%; animation-delay: 0.25s; }
@keyframes eqBounce {
  from { transform: scaleY(0.3); }
  to { transform: scaleY(1); }
}
.win-ctrl {
  display: flex;
  gap: 8px;
  align-items: center;
}
.win-ctrl i {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
}
.win-ctrl i.play {
  background: var(--accent);
  width: 26px;
  height: 26px;
}
.win-progress {
  height: 3px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 2px;
  margin-top: 4px;
  overflow: hidden;
}
.win-progress b {
  display: block;
  width: 38%;
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  animation: progressPulse 3s ease-in-out infinite;
}
@keyframes progressPulse {
  0%, 100% { width: 38%; }
  50% { width: 45%; }
}

/* ===== Hero Particle Canvas ===== */
#heroParticles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* ===== Section Common ===== */
.section {
  padding: 100px 0;
  position: relative;
  z-index: 2;
}
.section-label {
  font-size: 11px;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 12px;
  font-weight: 600;
}
.section h2 {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.section .section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 56px;
  max-width: 560px;
  line-height: 1.7;
}

/* Dividers */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 0;
  position: relative;
  z-index: 2;
}

/* ===== Features Grid ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}
.feature-card {
  padding: 36px 32px;
  background: var(--bg-card);
  transition: background 0.3s, transform 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
  perspective: 800px;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
/* Glowing border animation */
.feature-card::after {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--accent), var(--purple), var(--blue), var(--accent));
  background-size: 300% 300%;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.5s;
  animation: borderGlow 3s linear infinite;
}
@keyframes borderGlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
.feature-card:hover {
  background: var(--bg-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
  z-index: 1;
}
.feature-card:hover::before { opacity: 1; }
.feature-card:hover::after { opacity: 1; }
.feature-card .fc-icon {
  font-size: 28px;
  margin-bottom: 16px;
  display: block;
  filter: grayscale(0.3);
  transition: transform 0.3s, filter 0.3s;
}
.feature-card:hover .fc-icon {
  transform: scale(1.15);
  filter: grayscale(0);
}
.feature-card .fc-num {
  font-size: 11px;
  color: var(--accent-light);
  margin-bottom: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
}
.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.3;
}
.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===== Stats ===== */
.stats-row {
  display: flex;
  gap: 80px;
  margin-top: 56px;
  padding-top: 56px;
  border-top: 1px solid var(--border);
}
.stat-item { text-align: center; }
.stat-num {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 8px;
  font-weight: 500;
}

/* ===== Tech Tags ===== */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 56px;
}
.tech-tag {
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-weight: 500;
  transition: all var(--transition);
  cursor: default;
}
.tech-tag:hover {
  color: var(--text);
  border-color: var(--accent);
  background: var(--bg-hover);
  transform: translateY(-1px);
  box-shadow: 0 0 16px rgba(255, 107, 74, 0.1);
}

/* ===== Code Block ===== */
.code-block {
  background: #06060d;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 13px;
  position: relative;
}
.code-block .cb-header {
  height: 38px;
  background: #0a0a14;
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.code-block .cb-header span { width: 10px; height: 10px; border-radius: 50%; }
.code-block .cb-header span:nth-child(1) { background: #ff5f57; }
.code-block .cb-header span:nth-child(2) { background: #febc2e; }
.code-block .cb-header span:nth-child(3) { background: #28c840; }
.code-block .cb-header .cbt {
  flex: 1;
  text-align: center;
  font-size: 11px;
  color: var(--text-muted);
  margin-right: 34px;
  font-weight: 500;
}
.code-block .cb-body {
  padding: 24px 28px;
  line-height: 2;
  color: var(--text-secondary);
}
.code-block .cb-body .prompt { color: var(--accent-light); }
.code-block .cb-body .cmd { color: var(--text); }
.code-block .cb-body .out { color: var(--green); }
.code-block .cb-body .comment { color: var(--text-muted); }
.copy-btn {
  position: absolute;
  top: 10px;
  right: 16px;
  padding: 5px 12px;
  font-size: 11px;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: var(--font-sans);
  transition: all var(--transition);
  z-index: 5;
}
.copy-btn:hover { color: var(--text); border-color: var(--border-hover); }
.copy-btn.copied { color: var(--green); border-color: var(--green); }

/* ===== Changelog Timeline ===== */
.changelog-timeline {
  position: relative;
  padding-left: 32px;
  border-left: 1px solid var(--border);
}
.changelog-item {
  position: relative;
  padding-bottom: 40px;
}
.changelog-item:last-child { padding-bottom: 0; }
.changelog-item::before {
  content: '';
  position: absolute;
  left: -38px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 2px solid var(--border);
  transition: all 0.3s;
}
.changelog-item:hover::before {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 12px rgba(255, 107, 74, 0.4);
}
.changelog-item .cl-ver {
  font-size: 12px;
  color: var(--accent-light);
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.changelog-item .cl-ver .cl-date {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 400;
  letter-spacing: 0;
}
.changelog-item .cl-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.3;
}
.changelog-item .cl-changes {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.changelog-item .cl-changes li {
  font-size: 14px;
  color: var(--text-secondary);
  padding-left: 16px;
  position: relative;
  line-height: 1.6;
}
.changelog-item .cl-changes li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.5;
}
.changelog-item .cl-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-right: 6px;
  vertical-align: middle;
}
.cl-tag.feat { background: rgba(74, 222, 128, 0.15); color: var(--green); }
.cl-tag.fix { background: rgba(251, 191, 36, 0.15); color: var(--yellow); }
.cl-tag.perf { background: rgba(96, 165, 250, 0.15); color: var(--blue); }
.cl-tag.refactor { background: rgba(167, 139, 250, 0.15); color: var(--purple); }

/* ===== FAQ Section ===== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}
.faq-item {
  background: var(--bg-card);
  overflow: hidden;
}
.faq-question {
  width: 100%;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  text-align: left;
  transition: background 0.2s;
  gap: 16px;
}
.faq-question:hover { background: rgba(255, 255, 255, 0.02); }
.faq-question .faq-arrow {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  transition: transform 0.3s;
  color: var(--text-muted);
}
.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.faq-answer-inner {
  padding: 0 28px 24px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.faq-item.open .faq-answer { max-height: 200px; }

/* ===== Download Section ===== */
.download-center { text-align: center; }
.download-box {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 52px 64px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
  position: relative;
  overflow: hidden;
}
.download-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, var(--accent-glow), transparent 80%);
  opacity: 0;
  transition: opacity 0.4s;
}
.download-box:hover {
  border-color: var(--border-hover);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  transform: translateY(-2px);
}
.download-box:hover::before { opacity: 1; }
.download-box > * { position: relative; z-index: 1; }
.download-box .ver {
  font-size: 13px;
  color: var(--accent-light);
  font-weight: 700;
  letter-spacing: 0.04em;
}
.download-box h3 {
  font-size: 24px;
  color: var(--text);
  font-weight: 700;
}
.download-box .meta {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  gap: 24px;
}
.dl-btn {
  padding: 16px 48px;
  font-size: 16px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 6px 24px rgba(255, 107, 74, 0.3);
}
.dl-btn:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(255, 107, 74, 0.4);
}
.dl-btn:active { transform: translateY(0); }
.dl-btn .icon-dl {
  width: 18px;
  height: 18px;
}
.download-box .hint {
  font-size: 12px;
  color: var(--text-muted);
}
.download-box .hint a {
  color: var(--accent-light);
  font-weight: 500;
}
.download-box .direct-hint {
  margin-top: 14px;
  padding: 12px 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-muted);
  text-align: left;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.download-box .direct-hint code {
  font-family: Consolas, "Courier New", monospace;
  font-size: 11px;
  word-break: break-all;
  color: var(--accent-light);
  background: var(--bg-code, rgba(127,127,127,0.12));
  padding: 2px 6px;
  border-radius: 5px;
}
.download-box .direct-hint .direct-note {
  display: inline-block;
  margin-top: 4px;
  color: var(--text-muted);
  opacity: 0.85;
}

/* ===== 下载按钮加载态 ===== */
.dl-btn.loading {
  pointer-events: none;
  opacity: 0.85;
  cursor: wait;
}
.dl-btn .spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: dlSpin 0.7s linear infinite;
}
@keyframes dlSpin {
  to { transform: rotate(360deg); }
}

/* ===== 下载备用页面（弹层） ===== */
.dl-fallback {
  position: fixed;
  inset: 0;
  z-index: 9990;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(6, 6, 10, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.dl-fallback.show {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.dl-fallback-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px 28px;
  text-align: center;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
  animation: dlPop 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
}
@keyframes dlPop {
  from { transform: translateY(16px) scale(0.96); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}
.dl-fallback-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  background: var(--accent-glow);
  border-radius: 50%;
}
.dl-fallback-icon svg {
  width: 30px;
  height: 30px;
}
.dl-fallback-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--text);
  margin-bottom: 10px;
}
.dl-fallback-card p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.7;
}
.dl-fallback-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  box-shadow: 0 6px 24px rgba(255, 107, 74, 0.3);
  transition: all var(--transition);
}
.dl-fallback-btn:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(255, 107, 74, 0.4);
}
.dl-fallback-close {
  display: block;
  margin: 20px auto 0;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--text-muted);
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.dl-fallback-close:hover {
  color: var(--text);
  border-color: var(--border-hover);
}

/* ===== Star Badge ===== */
.star-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
  transition: all var(--transition);
}
.star-badge:hover {
  border-color: var(--yellow);
  color: var(--yellow);
}
.star-badge svg { width: 14px; height: 14px; }

/* Ripple */
.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  transform: scale(0);
  animation: ripple 0.6s ease-out;
  pointer-events: none;
}
@keyframes ripple {
  to { transform: scale(4); opacity: 0; }
}

/* ===== Footer ===== */
.footer {
  padding: 48px 0;
  text-align: center;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
  position: relative;
  z-index: 2;
}
.footer a { color: var(--text-secondary); transition: color 0.2s; }
.footer a:hover { color: var(--accent-light); }
.footer .footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 12px;
}
.footer .footer-copy { font-size: 12px; }

/* ===== Back to Top ===== */
.back-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 100;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 18px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover {
  background: var(--bg-hover);
  border-color: var(--border-hover);
  color: var(--text);
  transform: translateY(-2px);
}

/* ===== Scroll Progress Bar ===== */
.scroll-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--purple), var(--blue), var(--accent));
  background-size: 200% 100%;
  z-index: 1000;
  transition: width 0.1s linear;
  animation: progressShimmer 2s linear infinite;
}
@keyframes progressShimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ===== Mobile Menu Button ===== */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 200;
  position: relative;
}
.mobile-menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.mobile-menu-btn.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.mobile-menu-btn.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Mobile Menu Overlay ===== */
.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  z-index: 150;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}
.mobile-menu-overlay.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.mobile-menu-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 280px;
  height: 100vh;
  background: var(--bg-elevated);
  border-left: 1px solid var(--border);
  z-index: 151;
  display: flex;
  flex-direction: column;
  padding: 80px 32px 40px;
  gap: 8px;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.mobile-menu-overlay.active .mobile-menu-panel {
  transform: translateX(0);
}
.mobile-menu-panel a {
  display: block;
  padding: 14px 18px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  letter-spacing: 0.01em;
}
.mobile-menu-panel a:hover,
.mobile-menu-panel a.active {
  color: var(--accent-light);
  background: rgba(255, 107, 74, 0.06);
}
.mobile-menu-panel a.gh-link {
  margin-top: auto;
  border: 1px solid var(--border);
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
}
.mobile-menu-panel a.gh-link:hover {
  border-color: var(--border-hover);
  color: var(--text);
}

/* ===== Custom Cursor ===== */
.cursor-dot {
  position: fixed;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: width 0.2s, height 0.2s, background 0.2s;
  mix-blend-mode: difference;
}
.cursor-ring {
  position: fixed;
  width: 32px;
  height: 32px;
  border: 1.5px solid rgba(255, 107, 74, 0.5);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9998;
  transform: translate(-50%, -50%);
  transition: width 0.3s, height 0.3s, border-color 0.3s, opacity 0.3s;
}
.cursor-ring.hover {
  width: 48px;
  height: 48px;
  border-color: var(--accent-light);
  background: rgba(255, 107, 74, 0.08);
}

/* ===== Section Navigation Dots ===== */
.section-dots {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
}
.section-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  border: 1px solid transparent;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  position: relative;
  text-decoration: none;
}
.section-dot::after {
  content: attr(data-label);
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.3s;
  font-weight: 500;
  letter-spacing: 0.04em;
}
.section-dot:hover {
  background: var(--accent);
  border-color: var(--accent);
  transform: scale(1.3);
}
.section-dot:hover::after {
  opacity: 1;
}
.section-dot.active {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 12px rgba(255, 107, 74, 0.5);
  transform: scale(1.2);
}

/* ===== Enhanced Hero Gradient Animation ===== */
.hero-left h1 {
  background: linear-gradient(135deg, var(--text) 0%, var(--accent-light) 40%, var(--purple) 70%, var(--text) 100%);
  background-size: 300% 300%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: heroGradient 8s ease-in-out infinite;
}
@keyframes heroGradient {
  0%, 100% { background-position: 0% 50%; }
  25% { background-position: 100% 0%; }
  50% { background-position: 100% 100%; }
  75% { background-position: 0% 100%; }
}

/* ===== Enhanced Download Button Pulse ===== */
.dl-btn {
  animation: dlPulse 2.5s ease-in-out infinite;
}
@keyframes dlPulse {
  0%, 100% { box-shadow: 0 6px 24px rgba(255, 107, 74, 0.3); }
  50% { box-shadow: 0 6px 36px rgba(255, 107, 74, 0.5), 0 0 60px rgba(255, 107, 74, 0.1); }
}

/* ===== 3.1 Spotlight Effect ===== */
.spotlight {
  position: fixed;
  pointer-events: none;
  z-index: 4;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 74, 0.04) 0%, rgba(167, 139, 250, 0.02) 40%, transparent 70%);
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 0.4s ease;
  will-change: left, top;
}
.spotlight.active { opacity: 1; }

/* ===== 3.1 Magnetic Effect ===== */
.magnetic {
  transition: transform 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ===== 3.1 Glassmorphism Enhancement ===== */
.topbar {
  background: rgba(10, 10, 15, 0.7);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.topbar.scrolled {
  background: rgba(10, 10, 15, 0.88);
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

.download-box {
  background: rgba(20, 20, 30, 0.6);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

/* ===== 3.1 Feature Card SVG Icons ===== */
.feature-card .fc-icon {
  font-size: 0;
  display: block;
  width: 40px;
  height: 40px;
  margin-bottom: 16px;
  filter: none;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), color 0.3s;
  color: var(--text-muted);
}
.feature-card .fc-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}
.feature-card:hover .fc-icon {
  transform: scale(1.12);
  color: var(--accent);
}

/* ===== 3.1 Text Reveal on Scroll ===== */
.text-reveal {
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent) var(--reveal-progress, 0%), var(--text-muted) var(--reveal-progress, 0%));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: --reveal-progress 0.3s ease-out;
}

/* ===== 3.1 Keyboard Hint ===== */
.kbd-hint {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 80;
  font-size: 11px;
  color: var(--text-muted);
  opacity: 0.5;
  transition: opacity 0.3s;
  pointer-events: none;
  letter-spacing: 0.04em;
}
.kbd-hint kbd {
  display: inline-block;
  padding: 2px 7px;
  font-size: 10px;
  font-family: var(--font-mono);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--accent-light);
  margin: 0 3px;
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}
.kbd-hint.fade-out {
  opacity: 0;
}

/* ===== 3.1 Music Rain Easter Egg ===== */
.music-rain-note {
  position: fixed;
  pointer-events: none;
  z-index: 500;
  font-size: 32px;
  animation: musicRainFall linear forwards;
  user-select: none;
}
@keyframes musicRainFall {
  0% {
    opacity: 1;
    transform: translateY(-60px) rotate(0deg) scale(0.5);
  }
  10% { opacity: 1; transform: translateY(10vh) rotate(90deg) scale(1); }
  90% { opacity: 0.8; }
  100% {
    opacity: 0;
    transform: translateY(105vh) rotate(360deg) scale(1.2);
  }
}

/* ===== 3.1 Enhanced Feature Card Hover ===== */
.feature-card {
  --mx: 0.5;
  --my: 0.5;
  transform-style: preserve-3d;
  background:
    radial-gradient(circle at calc(var(--mx) * 100%) calc(var(--my) * 100%),
      rgba(255, 107, 74, 0.06), transparent 50%),
    var(--bg-card);
}
.feature-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4), 0 0 30px rgba(255, 107, 74, 0.05);
  background:
    radial-gradient(circle at calc(var(--mx) * 100%) calc(var(--my) * 100%),
      rgba(255, 107, 74, 0.12), transparent 50%),
    var(--bg-hover);
}

/* ===== 3.1 Section Title Glow ===== */
.section h2 {
  position: relative;
}
.section h2::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.section h2.reveal.visible::after {
  width: 60px;
}

/* ===== 3.1 Back to Top Enhancement ===== */
.back-top {
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(20, 20, 30, 0.6);
}

/* ===== Screenshot Panel Switching ===== */
.win-panel { display: none; }
.win-panel.active { display: block; }

/* ===== v3.2 Mouse Trail Canvas ===== */
.mouse-trail-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 6;
  mix-blend-mode: screen;
}

/* ===== v3.2 Download Pulse Ring ===== */
.dl-pulse-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border: 2px solid rgba(255, 107, 74, 0.5);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  animation: dlPulseExpand 2s ease-out forwards;
  pointer-events: none;
}
@keyframes dlPulseExpand {
  0% {
    width: 0;
    height: 0;
    opacity: 0.7;
    border-width: 3px;
  }
  60% {
    opacity: 0.3;
  }
  100% {
    width: 320px;
    height: 100px;
    opacity: 0;
    border-width: 1px;
  }
}

/* ===== v3.2 Title Scan Line ===== */
.section h2::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 40%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.06), transparent);
  transform: skewX(-20deg);
  pointer-events: none;
  z-index: 1;
}
.section h2.reveal.visible::before {
  animation: titleScan 1.5s ease-out forwards;
}
@keyframes titleScan {
  0% { left: -100%; }
  60% { left: 120%; }
  100% { left: 120%; }
}

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .hero {
    flex-direction: column;
    gap: 48px;
    padding: 130px 0 60px;
  }
  .hero-right { flex: 0 0 auto; width: 100%; }
  .hero-left h1 { font-size: 40px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .topbar-links { display: none; }
  .mobile-menu-btn { display: flex; }
  .cursor-dot, .cursor-ring { display: none; }
  .section-dots { display: none; }
  .spotlight { display: none; }
  .mouse-trail-canvas { display: none; }
  .kbd-hint { display: none; }
  .stats-row { flex-wrap: wrap; gap: 40px; justify-content: center; }
  .section { padding: 70px 0; }
  .section h2 { font-size: 30px; }
  .changelog-timeline { padding-left: 24px; }
  .changelog-item::before { left: -30px; width: 10px; height: 10px; }
  .download-box { padding: 40px 36px; }
}

@media (max-width: 600px) {
  .hero-left h1 { font-size: 32px; }
  .hero { padding: 120px 0 48px; }
  .features-grid { grid-template-columns: 1fr; }
  .download-box { padding: 36px 28px; }
  .wrap { padding: 0 20px; }
  .stats-row { gap: 32px; }
  .stat-num { font-size: 36px; }
  .section h2 { font-size: 26px; }
  .section { padding: 56px 0; }
  .hero-btns { flex-direction: column; }
  .hero-btns a { width: 100%; justify-content: center; }
  .changelog-timeline { padding-left: 20px; }
  .changelog-item::before { left: -26px; width: 8px; height: 8px; }
  .changelog-item .cl-title { font-size: 15px; }
}

/* ===== 下载弹层：多下载源 + 公益寻人 ===== */
.dl-fallback-card { max-width: 520px; }
.dl-fallback-sub {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.dl-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}
.dl-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  transition: all var(--transition);
  text-align: left;
}
.dl-link.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 20px rgba(255, 107, 74, 0.3);
}
.dl-link.primary:hover {
  background: var(--accent-light);
  transform: translateY(-1px);
  box-shadow: 0 10px 26px rgba(255, 107, 74, 0.4);
}
.dl-link.backup {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
}
.dl-link.backup:hover {
  background: var(--bg-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}
.dl-link-tag {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 999px;
  flex-shrink: 0;
  font-weight: 700;
  letter-spacing: 0.05em;
}
.dl-link.primary .dl-link-tag { background: rgba(255, 255, 255, 0.22); }
.dl-link.backup .dl-link-tag { background: var(--border); color: var(--text-secondary); }
.dl-link-text { flex: 1; }

/* 公益寻人区 */
.dl-charity {
  border-top: 1px solid var(--border);
  padding-top: 16px;
  margin-bottom: 8px;
}
.dl-charity-head {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 12px;
}
.dl-charity-tag {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-light);
  border: 1px solid rgba(255, 107, 74, 0.25);
  background: rgba(255, 107, 74, 0.07);
  padding: 2px 8px;
  border-radius: 999px;
}
.dl-charity-list {
  max-height: 300px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-right: 4px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.dl-charity-list::-webkit-scrollbar { width: 6px; }
.dl-charity-list::-webkit-scrollbar-track { background: transparent; }
.dl-charity-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.dl-charity-list::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }
.dl-charity-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  display: flex;
  gap: 12px;
  align-items: center;
  text-align: left;
  flex-shrink: 0;
}
.dl-cc-photo {
  width: 60px;
  height: 60px;
  border-radius: 8px;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--bg-elevated);
}
.dl-cc-photo img { width: 100%; height: 100%; object-fit: cover; }
.dl-cc-info { flex: 1; min-width: 0; }
.dl-cc-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 2px;
}
.dl-cc-meta {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.dl-cc-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.dl-cc-url {
  margin-left: auto;
  flex-shrink: 0;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-light);
  border: 1px solid rgba(255, 107, 74, 0.3);
  padding: 6px 12px;
  border-radius: 999px;
  transition: all var(--transition);
}
.dl-cc-url:hover { background: rgba(255, 107, 74, 0.1); }
.dl-charity-loading {
  color: var(--text-muted);
  font-size: 12px;
  width: 100%;
  text-align: center;
}

@media (max-width: 600px) {
  .dl-fallback-card { padding: 32px 20px 24px; }
  .dl-charity-card { flex-wrap: wrap; }
  .dl-cc-url { margin-left: 0; width: 100%; text-align: center; }
}