/* ============================================================
   时序·TaskNote 官网 —— 沉浸式深色科技风（青色/湖绿主色）
   ============================================================ */

:root {
  /* 主色（青色/湖绿） */
  --primary: #22d3ee;
  --primary-2: #2dd4bf;
  --primary-3: #06b6d4;
  --primary-glow: rgba(34, 211, 238, 0.55);
  --grad: linear-gradient(135deg, #22d3ee, #2dd4bf 45%, #34d399);
  --grad-text: linear-gradient(120deg, #7dd3fc, #2dd4bf 45%, #a7f3d0);

  /* 背景（深色） */
  --bg: #060a12;
  --bg-2: #0a111c;
  --bg-3: #0e1726;
  --card: rgba(255, 255, 255, 0.03);
  --card-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --border-2: rgba(34, 211, 238, 0.35);

  /* 文本 */
  --text: #eaf6ff;
  --text-2: #b7c8dc;
  --text-3: #7d8fa6;

  --radius: 18px;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.7);
  --font: "Noto Sans SC", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* 选区 */
::selection { background: var(--primary-3); color: #fff; }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #1c2b3f; border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-3); }

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* ---------- 背景画布 / 进度条 / 光斑 ---------- */
/* 粒子画布提升为独立合成层，避免每帧重绘迫使下层 DOM 重合成导致抖动 */
#bg-canvas { position: fixed; inset: 0; z-index: -2; transform: translateZ(0); will-change: transform; }
#scroll-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: var(--grad); z-index: 1000; box-shadow: 0 0 12px var(--primary-glow);
}
/* 光斑：用 transform 定位（合成器属性，不触发 layout/重绘），位置由 mousemove 事件驱动 */
#glow-cursor {
  position: fixed; left: 0; top: 0; width: 420px; height: 420px; border-radius: 50%;
  background: radial-gradient(circle, var(--primary-glow), transparent 65%);
  pointer-events: none; z-index: -1; transform: translate(-50%, -50%);
  opacity: 0; transition: opacity .4s; will-change: transform;
}
@media (hover: hover) { #glow-cursor { opacity: .5; } }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 26px; border-radius: 999px; font-weight: 600; font-size: 15px;
  transition: transform .25s, box-shadow .25s, background .25s; position: relative; overflow: hidden;
  white-space: nowrap;
}
.btn::after {
  content: ""; position: absolute; top: 0; left: -150%; width: 100%; height: 100%;
  background: linear-gradient(120deg, transparent, rgba(255,255,255,.4), transparent);
  transition: left .6s;
}
.btn:hover::after { left: 150%; }
.btn-primary { background: var(--grad); color: #04222b; box-shadow: 0 10px 30px -8px var(--primary-glow); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px -8px var(--primary-glow); }
.btn-ghost { border: 1px solid var(--border-2); color: var(--text); background: rgba(34,211,238,.06); }
.btn-ghost:hover { border-color: var(--primary); transform: translateY(-2px); box-shadow: 0 8px 30px -8px var(--primary-glow); }
.btn-sm { padding: 9px 18px; font-size: 13px; }
.btn-lg { padding: 15px 34px; font-size: 16px; }

/* ---------- 导航栏 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 16px 0; transition: all .3s;
}
.nav.scrolled { background: rgba(6,10,18,.72); backdrop-filter: blur(18px); padding: 11px 0; border-bottom: 1px solid var(--border); }
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 700; }
.brand-logo {
  width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
  background: var(--grad); color: #04222b; font-weight: 900; font-size: 18px;
  box-shadow: 0 4px 16px -4px var(--primary-glow);
}
.brand-name { letter-spacing: .5px; }
.brand-name b { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nav-links { display: flex; gap: 34px; }
.nav-links a { color: var(--text-2); font-size: 15px; font-weight: 500; position: relative; transition: color .2s; }
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 2px;
  background: var(--grad); transition: width .3s; border-radius: 2px;
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }
.nav-actions { display: flex; align-items: center; gap: 14px; }
.nav-burger { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-burger span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: all .3s; }
.nav-burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; }
.nav-burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.nav-mobile {
  display: none; flex-direction: column; gap: 6px; padding: 16px 24px;
  background: rgba(6,10,18,.95); backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
}
.nav-mobile a { padding: 12px; border-radius: 10px; color: var(--text-2); font-size: 16px; }
.nav-mobile a:hover { background: var(--card-hover); color: var(--text); }

/* ---------- Hero ---------- */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; padding: 130px 0 80px; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; z-index: -1; }
.orb {
  position: absolute; border-radius: 50%; pointer-events: none;
  animation: orbBreath 9s ease-in-out infinite; will-change: opacity;
}
.orb-1 { width: 560px; height: 560px; background: radial-gradient(circle, rgba(6,182,212,.50) 0%, rgba(6,182,212,0) 68%); top: -160px; left: -140px; }
.orb-2 { width: 500px; height: 500px; background: radial-gradient(circle, rgba(45,212,191,.45) 0%, rgba(45,212,191,0) 68%); bottom: -180px; right: -120px; animation-delay: -3s; }
.orb-3 { width: 340px; height: 340px; background: radial-gradient(circle, rgba(37,99,235,.40) 0%, rgba(37,99,235,0) 68%); top: 40%; right: 30%; animation-delay: -6s; }
/* 仅透明度呼吸，不产生位移，避免大光晕逐帧位移导致抖动 */
@keyframes orbBreath { 0%,100% { opacity: .5; } 50% { opacity: .78; } }
.grid-lines {
  position: absolute; inset: 0; opacity: .5;
  background-image: linear-gradient(rgba(34,211,238,.06) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(34,211,238,.06) 1px, transparent 1px);
  background-size: 60px 60px;
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}
.hero-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: grid; grid-template-columns: 1.1fr 1fr; gap: 40px; align-items: center; width: 100%; }
.hero-text { position: relative; z-index: 2; }
.badge {
  display: inline-flex; align-items: center; gap: 8px; padding: 7px 16px; font-size: 13px;
  border-radius: 999px; border: 1px solid var(--border-2); color: var(--primary);
  background: rgba(34,211,238,.08); margin-bottom: 24px; letter-spacing: .5px;
}
.hero-title { font-size: clamp(40px, 6vw, 68px); font-weight: 900; line-height: 1.15; margin-bottom: 22px; }
.hero-title .typing { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.typing-cursor { display: inline-block; width: 4px; height: .9em; background: var(--primary); margin-left: 4px; animation: blink 1s steps(1) infinite; vertical-align: text-bottom; }
@keyframes blink { 50% { opacity: 0; } }
.hero-sub { font-size: clamp(16px, 2vw, 20px); color: var(--text-2); margin-bottom: 32px; font-weight: 300; }
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 30px; }
.hero-meta { display: flex; gap: 20px; flex-wrap: wrap; color: var(--text-3); font-size: 14px; }
.hero-meta span { display: inline-flex; align-items: center; gap: 6px; }

.hero-visual { display: flex; justify-content: center; perspective: 1200px; }
.product-frame {
  position: relative; width: 100%; max-width: 560px; aspect-ratio: 4/3; border-radius: var(--radius);
  background: var(--bg-3); border: 1px solid var(--border); box-shadow: var(--shadow);
  overflow: hidden; display: grid; place-items: center;
  transition: transform .2s ease-out; will-change: transform;
}
.product-frame img { width: 100%; height: 100%; object-fit: cover; }
.product-frame img.missing { opacity: .08; }
.frame-glow {
  position: absolute; inset: 0; border-radius: var(--radius);
  background: radial-gradient(circle at 30% 20%, rgba(34,211,238,.25), transparent 60%);
  pointer-events: none;
}
.chip {
  position: absolute; display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px;
  background: rgba(10,17,28,.85); backdrop-filter: blur(8px); border: 1px solid var(--border-2);
  border-radius: 12px; font-size: 13px; color: var(--text); box-shadow: 0 8px 24px -8px rgba(0,0,0,.6);
  /* 气泡本身不位移（避免小元素亚像素抖动），仅指示点做呼吸 */
}
.chip .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 8px var(--primary-glow); animation: dotPulse 2s ease-in-out infinite; }
.chip .dot.green { background: #34d399; box-shadow: 0 0 8px rgba(52,211,153,.8); animation-delay: .4s; }
.chip-1 { top: 18px; left: 18px; }
.chip-2 { bottom: 18px; left: 18px; animation-delay: -1s; }
.chip-3 { top: 18px; right: 18px; animation-delay: -1.4s; }
@keyframes dotPulse { 0%,100% { opacity: 1; transform: scale(1); } 50% { opacity: .55; transform: scale(.8); } }

.scroll-hint { position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%); width: 26px; height: 42px; border: 2px solid var(--text-3); border-radius: 20px; display: flex; justify-content: center; padding-top: 8px; }
.scroll-hint span { width: 4px; height: 8px; background: var(--primary); border-radius: 4px; animation: scrollDot 1.6s ease-in-out infinite; }
@keyframes scrollDot { 0% { transform: translateY(0); opacity: 1;} 70% { transform: translateY(14px); opacity: 0;} 100% { opacity: 0;} }

/* ---------- 顶部下载条 ---------- */
.download-strip { padding: 70px 0; background: linear-gradient(180deg, rgba(6,10,18,0), rgba(6,10,18,1)); }
.strip-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.strip-text { text-align: center; margin-bottom: 36px; }
.strip-title { font-size: clamp(28px, 4vw, 44px); font-weight: 900; margin-bottom: 10px; }
.strip-title span { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.strip-sub { color: var(--text-2); }
.strip-cards, .download-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; }

/* 下载卡片（共用） */
.dl-card {
  position: relative; padding: 26px 20px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--border); text-align: center;
  transition: transform .3s, border-color .3s, box-shadow .3s, background .3s; overflow: hidden;
  display: flex; flex-direction: column;
}
.dl-card:hover { transform: translateY(-6px); border-color: var(--border-2); background: var(--card-hover); box-shadow: 0 20px 50px -20px var(--primary-glow); }
.dl-card .dl-icon {
  width: 62px; height: 62px; margin: 0 auto 14px; border-radius: 16px; display: grid; place-items: center;
  background: rgba(34,211,238,.1); border: 1px solid var(--border-2); font-size: 30px;
  transition: transform .3s;
}
.dl-card:hover .dl-icon { transform: scale(1.08); }
.dl-card h4 { font-size: 19px; margin-bottom: 6px; font-weight: 700; }
.dl-card .dl-note { color: var(--text-3); font-size: 13px; margin-bottom: 16px; }
.dl-card .dl-size { color: var(--primary); font-size: 13px; font-weight: 600; margin-bottom: 16px; display: block; }
.dl-card .dl-btn {
  display: inline-flex; align-items: center; gap: 7px; width: 100%; justify-content: center;
  padding: 11px; border-radius: 12px; background: var(--grad); color: #04222b; font-weight: 700; font-size: 15px;
  transition: transform .2s, box-shadow .2s; position: relative; overflow: hidden;
  margin-top: auto;
}
.dl-card .dl-btn:hover { transform: translateY(-2px); box-shadow: 0 10px 24px -6px var(--primary-glow); }

/* 即将上线：禁用态 + 悬停提示 */
.dl-card .dl-btn.dl-coming {
  background: var(--bg-3); color: var(--text-3); cursor: not-allowed; box-shadow: none;
  border: 1px dashed var(--border-2);
}
.dl-card .dl-btn.dl-coming:hover { transform: none; box-shadow: none; }
.dl-card .dl-btn.dl-coming:disabled { opacity: 1; }
.dl-coming { position: relative; }
.dl-tip {
  position: absolute; bottom: calc(100% + 10px); left: 50%; transform: translateX(-50%) translateY(4px);
  background: var(--text); color: var(--bg); padding: 7px 12px; border-radius: 9px; font-size: 12px;
  font-weight: 600; white-space: nowrap; opacity: 0; pointer-events: none;
  transition: opacity .25s, transform .25s; z-index: 20;
}
.dl-tip::after {
  content: ""; position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
  border: 6px solid transparent; border-top-color: var(--text);
}
.dl-card .dl-btn.dl-coming:hover .dl-tip,
.dl-card .dl-btn.dl-coming:focus .dl-tip { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 通用 Section ---------- */
.section { padding: 110px 0; max-width: 1200px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 60px; }
.kicker { display: inline-block; font-size: 12px; letter-spacing: 3px; color: var(--primary); margin-bottom: 14px; font-weight: 600; }
.section-title { font-size: clamp(30px, 4.5vw, 46px); font-weight: 900; margin-bottom: 16px; line-height: 1.2; }
.section-sub { color: var(--text-2); font-size: 17px; }

/* ---------- 数据统计 ---------- */
.stats { padding: 60px 24px; }
.stats-grid { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat {
  text-align: center; padding: 34px 16px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--border);
}
.stat b { font-size: clamp(30px, 4vw, 46px); font-weight: 900; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; display: block; margin-bottom: 8px; }
.stat span { color: var(--text-3); font-size: 14px; }

/* ---------- 特性卡片 ---------- */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature-card {
  padding: 34px 26px; border-radius: var(--radius); background: var(--card);
  border: 1px solid var(--border); transition: transform .3s, border-color .3s, box-shadow .3s, background .3s;
  transform-style: preserve-3d; position: relative;
}
.feature-card:hover { border-color: var(--border-2); background: var(--card-hover); box-shadow: 0 24px 60px -24px var(--primary-glow); }
/* 特性卡片顶部截图缩略图（未放图时显示渐变占位） */
.fc-thumb {
  position: relative; height: 150px; border-radius: 12px; margin-bottom: 20px; overflow: hidden;
  background: linear-gradient(135deg, rgba(34,211,238,.14), rgba(139,92,246,.1));
  border: 1px solid var(--border);
}
.fc-thumb::before {
  content: "待上传截图"; position: absolute; inset: 0; display: grid; place-items: center;
  font-size: 13px; color: var(--text-3); letter-spacing: .12em;
}
.fc-thumb img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.feature-card:hover .fc-thumb img { transform: scale(1.06); }
.fc-thumb img.missing { display: none; }
.fc-icon {
  width: 58px; height: 58px; border-radius: 14px; display: grid; place-items: center;
  font-size: 27px; margin-bottom: 20px; background: rgba(34,211,238,.1); border: 1px solid var(--border-2);
}
.feature-card h3 { font-size: 20px; margin-bottom: 12px; font-weight: 700; }
.feature-card p { color: var(--text-2); font-size: 15px; font-weight: 300; }

/* ---------- 四象限 ---------- */
.quadrant-section { padding-bottom: 140px; }
.quadrant { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; max-width: 720px; margin: 0 auto; }
.quad { min-height: 170px; border-radius: var(--radius); padding: 28px; position: relative; overflow: hidden; border: 1px solid var(--border); transition: transform .3s, box-shadow .3s; }
.quad:hover { transform: translateY(-4px); box-shadow: 0 20px 50px -20px var(--primary-glow); }
.quad h4 { font-size: 19px; margin-bottom: 8px; font-weight: 700; }
.quad span { color: var(--text-2); font-size: 14px; }
.quad::before { content: ""; position: absolute; top: -40%; right: -30%; width: 120px; height: 120px; border-radius: 50%; filter: blur(40px); opacity: .5; }
.q1 { background: rgba(34,211,238,.1); border-color: rgba(34,211,238,.35); } .q1::before { background: #06b6d4; }
.q2 { background: rgba(52,211,153,.08); border-color: rgba(52,211,153,.3); } .q2::before { background: #34d399; }
.q3 { background: rgba(251,191,36,.08); border-color: rgba(251,191,36,.3); } .q3::before { background: #fbbf24; }
.q4 { background: rgba(244,114,182,.08); border-color: rgba(244,114,182,.3); } .q4::before { background: #f472b6; }

/* ---------- 多视图 ---------- */
.views-section { padding-top: 40px; }
.views-wrap { max-width: 980px; margin: 0 auto; }
.views-tabs { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 30px; }
.vt {
  padding: 10px 26px; border-radius: 999px; font-size: 15px; font-weight: 600; color: var(--text-2);
  border: 1px solid var(--border); background: var(--card); transition: all .3s;
}
.vt:hover { color: var(--text); border-color: var(--border-2); }
.vt.active { background: var(--grad); color: #04222b; border-color: transparent; box-shadow: 0 8px 24px -8px var(--primary-glow); }
.views-stage { position: relative; perspective: 1200px; }
.view-frame {
  border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg-3);
  aspect-ratio: 16/9; overflow: hidden; box-shadow: var(--shadow); position: relative;
  transition: transform .2s ease-out; will-change: transform;
}
.view-frame img { width: 100%; height: 100%; object-fit: cover; transition: opacity .35s, transform .35s; }
.view-frame img.missing { opacity: .08; }
.view-frame img.switching { opacity: 0; transform: scale(.96); }
.view-caption { position: absolute; bottom: 0; left: 0; right: 0; padding: 40px 24px 18px; background: linear-gradient(transparent, rgba(6,10,18,.9)); color: var(--text); font-size: 15px; }

/* ---------- 主题 ---------- */
.themes-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.theme-card {
  border-radius: 14px; padding: 10px; border: 2px solid var(--border); cursor: pointer;
  transition: transform .3s, border-color .3s, box-shadow .3s; background: var(--bg-3);
}
.theme-card:hover { transform: translateY(-5px); box-shadow: 0 18px 44px -20px var(--primary-glow); }
.theme-card.active { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(34,211,238,.2); }
.theme-preview {
  height: 92px; border-radius: 9px; margin-bottom: 10px; position: relative; overflow: hidden;
  display: grid; place-items: center; font-size: 22px;
}
/* 主题预览截图（未放图时保留渐变 + emoji 占位） */
.theme-preview .theme-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.theme-preview .theme-img.missing { display: none; }
.theme-preview span { position: relative; z-index: 1; }
.theme-card h4 { text-align: center; font-size: 14px; color: var(--text-2); font-weight: 500; }

/* ---------- 笔记互通 ---------- */
.notes-section { padding-top: 40px; }
.notes-showcase { display: grid; grid-template-columns: 1.6fr 1fr; gap: 26px; align-items: stretch; }
.ns-main { border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg-3); overflow: hidden; min-height: 380px; display: grid; place-items: center; box-shadow: var(--shadow); }
.ns-main img { width: 100%; height: 100%; object-fit: cover; }
.ns-main img.missing { opacity: .08; }
.ns-list { display: flex; flex-direction: column; gap: 16px; }
.ns-item {
  display: flex; gap: 16px; align-items: flex-start; padding: 20px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--border); transition: all .3s;
}
.ns-item:hover { border-color: var(--border-2); background: var(--card-hover); transform: translateX(4px); }
.ns-ico { font-size: 26px; width: 52px; height: 52px; flex: none; border-radius: 13px; display: grid; place-items: center; background: rgba(34,211,238,.1); border: 1px solid var(--border-2); }
.ns-item h4 { font-size: 17px; margin-bottom: 4px; font-weight: 700; }
.ns-item p { color: var(--text-3); font-size: 14px; }

/* ---------- 效率工具 ---------- */
.tools-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.tool { text-align: center; padding: 30px 18px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--border); transition: all .3s; }
.tool:hover { border-color: var(--border-2); transform: translateY(-5px); box-shadow: 0 18px 44px -20px var(--primary-glow); }
.t-ico { font-size: 34px; display: block; margin-bottom: 14px; }
.tool h4 { font-size: 17px; margin-bottom: 8px; font-weight: 700; }
.tool p { color: var(--text-3); font-size: 13px; }

/* ---------- 下载区 ---------- */
.download-section { padding-top: 40px; padding-bottom: 140px; }
.download-head { text-align: center; max-width: 680px; margin: 0 auto 44px; }
.download-version { display: inline-block; margin-top: 16px; padding: 7px 16px; border-radius: 999px; border: 1px solid var(--border-2); color: var(--primary); font-size: 13px; background: rgba(34,211,238,.07); }
.strip-cards, .download-grid { grid-template-columns: repeat(6, 1fr); }
.dl-btn .dl-arrow { transition: transform .3s; }
.dl-card:hover .dl-btn .dl-arrow { transform: translateX(4px); }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--border); background: var(--bg-2); padding: 60px 24px 40px; }
.footer-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 30px; align-items: start; }
.footer-brand p { color: var(--text-3); font-size: 14px; margin-top: 12px; }
.footer-links { display: flex; flex-direction: column; gap: 14px; }
.fl-item { display: flex; flex-direction: column; gap: 3px; }
.fl-item a { color: var(--text-2); font-size: 15px; font-weight: 600; transition: color .2s; }
.fl-item a:hover { color: var(--primary); }
.fl-item span { color: var(--text-3); font-size: 12px; }
.footer-meta { text-align: right; color: var(--text-3); font-size: 13px; line-height: 2; }
.footer-icp a { color: var(--text-3); text-decoration: none; transition: color .2s; }
.footer-icp a:hover { color: var(--primary); }

/* ---------- 滚动进场动画 ---------- */
.reveal { opacity: 0; transform: translateY(36px); transition: opacity .8s cubic-bezier(.2,.7,.2,1), transform .8s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal:nth-child(2) { transition-delay: .1s; }
.reveal:nth-child(3) { transition-delay: .2s; }
.reveal:nth-child(4) { transition-delay: .3s; }

/* 占位图（未放置图片时显示渐变+图标） */
img.missing { background: radial-gradient(circle at 30% 30%, rgba(34,211,238,.25), transparent 60%), linear-gradient(135deg, #0e1726, #0a111c); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .themes-grid { grid-template-columns: repeat(3, 1fr); }
  .tools-grid { grid-template-columns: repeat(2, 1fr); }
  .strip-cards, .download-grid { grid-template-columns: repeat(3, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .notes-showcase { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-burger { display: flex; }
  .nav-mobile.open { display: flex; }
  .nav-actions .btn-primary { display: none; }
  .hero-inner { grid-template-columns: 1fr; padding-top: 20px; }
  .hero { padding-top: 110px; }
  .hero-visual { order: -1; }
  .hero-meta { justify-content: flex-start; }
  .features-grid { grid-template-columns: 1fr; }
  .quadrant { grid-template-columns: 1fr; }
  .themes-grid { grid-template-columns: repeat(2, 1fr); }
  .strip-cards, .download-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr; text-align: center; }
  .footer-meta { text-align: center; }
  .footer-links { flex-direction: row; justify-content: center; flex-wrap: wrap; }
}

@media (max-width: 480px) {
  .strip-cards, .download-grid { grid-template-columns: 1fr; }
  .themes-grid { grid-template-columns: 1fr 1fr; }
  .hero-cta .btn { flex: 1; }
}

/* 无障碍：减少动效 —— 直接关闭动画（而非压成 0.001s 的无限循环，否则会高频闪烁） */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}