/* ============================================================
   快贴落地页 V3 · style.css
   设计令牌复用快贴桌面版 tokens.css
   浅色暖白背景 + 真实便利贴拟态 + GSAP 动效
   ============================================================ */

/* ===== 设计令牌 ===== */
:root {
  /* 快贴色系 — 直接复用 tokens.css */
  --kt-yellow: #FFF9C4;
  --kt-orange: #FFE0B2;
  --kt-pink: #F8BBD0;
  --kt-green: #C8E6C9;
  --kt-blue: #BBDEFB;
  --kt-purple: #E1BEE7;
  --kt-ink: #5D4037;
  --kt-pencil: #BCAAA4;

  /* 三层阴影 — 复用 tokens.css */
  --kt-shadow-contact: 0 1px 2px rgba(93,64,55,0.28);
  --kt-shadow-cast: 0 3px 8px rgba(93,64,55,0.18);
  --kt-shadow-ambient: 0 8px 24px rgba(93,64,55,0.08);
  --kt-shadow-note: var(--kt-shadow-contact), var(--kt-shadow-cast), var(--kt-shadow-ambient);
  --kt-shadow-note-hover: 0 2px 4px rgba(93,64,55,0.32), 0 6px 16px rgba(93,64,55,0.22), 0 16px 48px rgba(93,64,55,0.12);

  /* 弹性缓动 — 复用 tokens.css */
  --kt-ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* 页面基础色 */
  --bg: #FAF8F5;
  --bg-warm: #F5F0EA;
  --bg-card: #FFFFFF;
  --fg: #3E2723;
  --fg-muted: #795548;
  --fg-light: #A1887F;
  --accent: #E65100;
  --accent-2: #BF360C;
  --accent-glow: rgba(230, 81, 0, 0.08);
  --border: #E0D6CC;
  --border-hover: #BCAAA4;

  /* 字体 */
  --serif: 'Noto Serif SC', serif;
  --sans: 'DM Sans', sans-serif;

  /* 圆角 */
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: auto; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--serif);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: white; }

/* ===== 布局 ===== */
.container { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }
.section { padding: 7rem 0; }

/* ===== 导航 ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.8rem 2.5rem;
  background: rgba(250, 248, 245, 0.88);
  backdrop-filter: blur(20px) saturate(1.2);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}
.nav.scrolled { box-shadow: 0 2px 20px rgba(93,64,55,0.06); }
.nav-logo {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.2rem 0;
}
.nav-logo-pin {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, #FF5252, #C62828);
  box-shadow: 0 1px 3px rgba(198,40,40,0.4);
}
.logo-text { display: flex; flex-direction: column; }
.logo-name {
  font-family: var(--serif);
  font-size: 1.1rem; font-weight: 700;
  color: var(--fg); line-height: 1.2;
}
.logo-sub {
  font-family: var(--sans);
  font-size: 0.6rem; font-weight: 400;
  color: var(--fg-muted); letter-spacing: 0.04em;
  line-height: 1.2;
}
.nav-links { display: flex; gap: 2rem; }
.nav-link {
  font-family: var(--sans);
  font-size: 0.82rem; font-weight: 500;
  color: var(--fg-muted);
  transition: color 0.3s;
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute; bottom: -4px; left: 0; right: 0;
  height: 2px; background: var(--accent);
  transform: scaleX(0); transition: transform 0.3s;
}
.nav-link:hover { color: var(--fg); }
.nav-link:hover::after { transform: scaleX(1); }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--sans);
  font-size: 0.85rem; font-weight: 600;
  padding: 0.55rem 1.2rem;
  border-radius: var(--radius-sm);
  cursor: pointer; border: none;
  transition: background 0.3s, color 0.3s, transform 0.3s;
  will-change: transform;
}
.btn-primary {
  background: var(--accent); color: white;
  box-shadow: 0 2px 8px rgba(230,81,0,0.25);
}
.btn-primary:hover {
  background: var(--accent-2); color: white;
  box-shadow: 0 4px 16px rgba(230,81,0,0.3);
}
.btn-ghost {
  background: transparent; color: var(--fg-muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--fg-muted); color: var(--fg);
}
.btn-lg { padding: 0.85rem 1.8rem; font-size: 0.95rem; }
.nav-cta { font-size: 0.78rem; padding: 0.4rem 1rem; }

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  background: var(--bg);
}
.hero-desk {
  position: relative;
  width: 100%; min-height: 100vh;
  /* 桌面纹理 */
  background:
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 120px,
      rgba(93,64,55,0.015) 120px,
      rgba(93,64,55,0.015) 121px
    ),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 120px,
      rgba(93,64,55,0.015) 120px,
      rgba(93,64,55,0.015) 121px
    ),
    radial-gradient(ellipse 80% 60% at 20% 50%, rgba(230,81,0,0.03), transparent),
    radial-gradient(ellipse 60% 80% at 80% 30%, rgba(191,54,12,0.02), transparent);
}

/* 桌面散落便利贴 */
.desk-note {
  position: absolute;
  left: var(--nx); top: var(--ny);
  width: 160px;
  padding: 1rem 1.1rem 0.8rem;
  border-radius: 2px;
  font-size: 0.82rem;
  line-height: 1.5;
  box-shadow: var(--kt-shadow-note);
  transform: rotate(var(--nr));
  transform-origin: center center;
  cursor: grab;
  z-index: 2;
  transition: box-shadow 0.3s;
  /* 纸纹 */
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 24px,
    rgba(93,64,55,0.02) 24px,
    rgba(93,64,55,0.02) 25px
  );
}
.desk-note:hover {
  box-shadow: var(--kt-shadow-note-hover);
  z-index: 10;
}
.desk-note:active { cursor: grabbing; }

.dn-yellow { background-color: var(--kt-yellow); color: var(--kt-ink); }
.dn-orange { background-color: var(--kt-orange); color: var(--kt-ink); }
.dn-pink { background-color: var(--kt-pink); color: var(--kt-ink); }
.dn-green { background-color: var(--kt-green); color: var(--kt-ink); }
.dn-blue { background-color: var(--kt-blue); color: var(--kt-ink); }
.dn-purple { background-color: var(--kt-purple); color: var(--kt-ink); }

.dn-text { font-weight: 500; margin-bottom: 0.3rem; }
.dn-text.dn-done { text-decoration: line-through; opacity: 0.5; }
.dn-text.dn-urgent { font-weight: 700; }
.dn-time {
  font-family: var(--sans);
  font-size: 0.65rem;
  opacity: 0.5;
  text-align: right;
}

/* 胶带 */
.dn-tape {
  position: absolute;
  top: -6px; left: 50%;
  transform: translateX(-50%) rotate(-2deg);
  width: 50px; height: 16px;
  background: rgba(255,255,255,0.45);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 1px;
  z-index: 3;
}

/* 图钉 */
.dn-pin {
  position: absolute;
  top: -4px; left: 50%;
  transform: translateX(-50%);
  width: 14px; height: 14px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, #FF5252, #C62828);
  box-shadow: 0 1px 3px rgba(198,40,40,0.4);
  z-index: 3;
}

/* 中央文字 */
.hero-center {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  z-index: 20;
  width: 90%;
  max-width: 600px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--sans);
  font-size: 0.78rem; font-weight: 500;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 0.4rem 1rem;
  border-radius: 20px;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(230,81,0,0.12);
}
.badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse-dot 2s ease infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

.hero-title {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 0;
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--fg);
  will-change: transform;
}
.ht-char {
  display: inline-block;
  will-change: transform, opacity;
  line-height: 1;
}
.ht-line { width: 100%; height: 0; flex-basis: 100%; }
.ht-char.ht-accent {
  color: var(--accent);
  font-style: italic;
  font-weight: 500;
}

.hero-desc {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: var(--fg-muted);
  margin-top: 1.5rem;
  line-height: 1.8;
}
.hero-cta {
  display: flex; gap: 1rem;
  justify-content: center;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}

.hero-hint {
  position: absolute;
  bottom: 2.5rem; left: 50%;
  transform: translateX(-50%);
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--fg-light);
  opacity: 0.6;
  z-index: 20;
  animation: hint-bounce 2s ease infinite;
}
.hint-icon { display: flex; }
@keyframes hint-bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-5px); }
}

/* ===== 通用段落标题 ===== */
.section-head { margin-bottom: 3.5rem; }
.num-badge {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.7rem; font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 0.8rem;
  opacity: 0.8;
}
.section-title {
  display: flex; flex-wrap: wrap; gap: 0.02em;
  font-size: clamp(2.2rem, 4.5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--fg);
  will-change: transform;
}
.st-char {
  display: inline-block;
  will-change: transform, opacity;
}
.st-char.st-accent {
  color: var(--accent);
  font-style: italic;
  font-weight: 500;
}
.section-desc {
  font-size: clamp(1rem, 1.3vw, 1.1rem);
  color: var(--fg-muted);
  margin-top: 1rem;
  max-width: 560px;
  line-height: 1.7;
}

/* ===== 01 真实贴纸感 ===== */
.real-section { background: var(--bg); }

.real-showcase {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 3rem;
}

/* 展示便利贴 — 大号 */
.showcase-note {
  position: relative;
  padding: 2rem 1.8rem 1.5rem;
  border-radius: 2px;
  font-size: 0.92rem;
  line-height: 1.6;
  box-shadow: var(--kt-shadow-note);
  cursor: grab;
  transition: box-shadow 0.3s, transform 0.3s;
  transform-origin: center center;
  /* 纸纹 */
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 28px,
    rgba(93,64,55,0.018) 28px,
    rgba(93,64,55,0.018) 29px
  );
}
.showcase-note:hover {
  box-shadow: var(--kt-shadow-note-hover);
  z-index: 5;
}

.showcase-yellow { background-color: var(--kt-yellow); color: var(--kt-ink); }
.showcase-orange { background-color: var(--kt-orange); color: var(--kt-ink); }
.showcase-pink { background-color: var(--kt-pink); color: var(--kt-ink); }
.showcase-green { background-color: var(--kt-green); color: var(--kt-ink); }
.showcase-blue { background-color: var(--kt-blue); color: var(--kt-ink); }
.showcase-purple { background-color: var(--kt-purple); color: var(--kt-ink); }

/* 胶带 */
.sn-tape {
  position: absolute;
  top: -8px; left: 50%;
  transform: translateX(-50%) rotate(-1deg);
  width: 60px; height: 18px;
  background: rgba(255,255,255,0.4);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 1px;
  z-index: 3;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--sans);
  font-size: 0.55rem; font-weight: 600;
  color: rgba(93,64,55,0.35);
  letter-spacing: 0.05em;
}
.sn-tape-blue { background: rgba(66,165,245,0.25); border-color: rgba(66,165,245,0.15); }
.sn-tape-green { background: rgba(102,187,106,0.25); border-color: rgba(102,187,106,0.15); }
.sn-tape-purple { background: rgba(149,117,205,0.25); border-color: rgba(149,117,205,0.15); }

/* 图钉 */
.sn-pin {
  position: absolute;
  top: -5px; left: 50%;
  transform: translateX(-50%);
  width: 16px; height: 16px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, #FF5252, #C62828);
  box-shadow: 0 1px 4px rgba(198,40,40,0.4);
  z-index: 3;
}

.sn-body { position: relative; z-index: 2; }
.sn-text { font-weight: 500; margin-bottom: 0.6rem; }
.sn-text.sn-done { text-decoration: line-through; opacity: 0.5; }
.sn-text.sn-urgent { font-weight: 700; }
.sn-footer {
  display: flex; align-items: center; justify-content: space-between;
  font-family: var(--sans);
  font-size: 0.65rem;
  opacity: 0.5;
}
.sn-tag {
  background: rgba(93,64,55,0.1);
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  font-weight: 500;
}

/* 微卷边 */
.sn-curl {
  position: absolute;
  bottom: 0; right: 0;
  width: 24px; height: 24px;
  background: linear-gradient(135deg, transparent 50%, rgba(0,0,0,0.04) 50%);
  border-radius: 0 0 0 0;
  z-index: 1;
}
.showcase-yellow .sn-curl { background: linear-gradient(135deg, transparent 50%, rgba(93,64,55,0.06) 50%); }
.showcase-note:hover .sn-curl {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, transparent 40%, rgba(0,0,0,0.06) 40%);
}

/* 细节说明 */
.real-details {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.detail-item {
  display: flex; gap: 0.8rem;
  align-items: flex-start;
}
.detail-icon {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
  color: var(--accent);
  flex-shrink: 0;
}
.detail-item h4 {
  font-size: 0.9rem; font-weight: 600;
  margin-bottom: 0.2rem;
  color: var(--fg);
}
.detail-item p {
  font-size: 0.78rem;
  color: var(--fg-muted);
  line-height: 1.5;
}

/* ===== 02 撕贴 ===== */
.tear-section {
  background: var(--bg-warm);
}

.tear-playground {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  padding: 3rem 2rem;
  background: var(--bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  min-height: 300px;
}
.tear-instruction {
  position: absolute;
  top: 1rem; left: 1.5rem;
  display: flex; align-items: center; gap: 0.4rem;
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--fg-light);
}

/* 可撕便利贴 */
.tear-note {
  position: relative;
  width: 180px;
  padding: 1.5rem 1.3rem 1.2rem;
  border-radius: 2px;
  font-size: 0.88rem;
  line-height: 1.5;
  box-shadow: var(--kt-shadow-note);
  cursor: default;
  transition: box-shadow 0.3s;
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 24px,
    rgba(93,64,55,0.02) 24px,
    rgba(93,64,55,0.02) 25px
  );
}
.tear-yellow { background-color: var(--kt-yellow); color: var(--kt-ink); }
.tear-orange { background-color: var(--kt-orange); color: var(--kt-ink); }
.tear-pink { background-color: var(--kt-pink); color: var(--kt-ink); }
.tear-green { background-color: var(--kt-green); color: var(--kt-ink); }
.tear-blue { background-color: var(--kt-blue); color: var(--kt-ink); }

.tn-body { position: relative; z-index: 2; }
.tn-text { font-weight: 500; margin-bottom: 0.3rem; }
.tn-text.tn-done { text-decoration: line-through; opacity: 0.5; }
.tn-text.tn-urgent { font-weight: 700; }
.tn-meta {
  font-family: var(--sans);
  font-size: 0.65rem;
  opacity: 0.5;
}

/* 撕角手柄 */
.tear-handle {
  position: absolute;
  bottom: 4px; right: 4px;
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  cursor: nwse-resize;
  z-index: 5;
  opacity: 0.3;
  transition: opacity 0.3s;
  color: var(--kt-ink);
}
.tear-note:hover .tear-handle { opacity: 0.7; }

/* 撕卷效果 */
.tear-curl {
  position: absolute;
  bottom: 0; right: 0;
  width: 0; height: 0;
  background: linear-gradient(135deg, transparent 50%, rgba(0,0,0,0.06) 50%);
  z-index: 3;
  border-radius: 0;
  pointer-events: none;
  opacity: 0;
}

.tear-remark {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.9rem;
  color: var(--fg-muted);
  font-style: italic;
}

/* ===== 03 脑暴模式 ===== */
.brainstorm-section { background: var(--bg); }

.brainstorm-desk {
  position: relative;
  background: #2C3E50;
  border-radius: var(--radius-lg);
  overflow: hidden;
  /* 木纹纹理 */
  background-image:
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 80px,
      rgba(0,0,0,0.03) 80px,
      rgba(0,0,0,0.03) 81px
    ),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 200px,
      rgba(0,0,0,0.02) 200px,
      rgba(0,0,0,0.02) 201px
    );
  background-color: #2C3E50;
  min-height: 400px;
}

.brain-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.8rem 1.5rem;
  background: rgba(0,0,0,0.15);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.brain-hint {
  display: flex; align-items: center; gap: 0.4rem;
  font-family: var(--sans);
  font-size: 0.72rem;
  color: rgba(255,255,255,0.5);
}
.brain-gather-btn {
  display: flex; align-items: center; gap: 0.4rem;
  font-family: var(--sans);
  font-size: 0.72rem; font-weight: 500;
  color: rgba(255,255,255,0.7);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px;
  padding: 0.35rem 0.8rem;
  cursor: pointer;
  transition: background 0.3s, color 0.3s;
}
.brain-gather-btn:hover {
  background: rgba(255,255,255,0.15);
  color: white;
}

.brain-canvas {
  position: relative;
  width: 100%;
  min-height: 350px;
}

/* 脑暴便利贴 */
.brain-note {
  position: absolute;
  left: var(--bn-x); top: var(--bn-y);
  width: 140px;
  padding: 0.8rem 0.9rem 0.6rem;
  border-radius: 2px;
  font-size: 0.78rem;
  line-height: 1.4;
  box-shadow: 0 2px 6px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  transform: rotate(var(--bn-r));
  cursor: grab;
  z-index: 2;
  color: var(--kt-ink);
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 20px,
    rgba(93,64,55,0.02) 20px,
    rgba(93,64,55,0.02) 21px
  );
}
.brain-note:active { cursor: grabbing; }
.brain-note p { font-weight: 500; }

.bn-yellow { background-color: var(--kt-yellow); }
.bn-orange { background-color: var(--kt-orange); }
.bn-pink { background-color: var(--kt-pink); }
.bn-green { background-color: var(--kt-green); }
.bn-blue { background-color: var(--kt-blue); }
.bn-purple { background-color: var(--kt-purple); }

.brainstorm-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}
.bf-item {
  text-align: center;
}
.bf-num {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.7rem; font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
  opacity: 0.6;
}
.bf-item h4 {
  font-size: 1.05rem; font-weight: 600;
  margin-bottom: 0.3rem;
  color: var(--fg);
}
.bf-item p {
  font-size: 0.85rem;
  color: var(--fg-muted);
  line-height: 1.5;
}

/* ===== 04 离线优先 & 多端同步 ===== */
.sync-section { background: var(--bg-warm); }

.sync-viz {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 3rem;
  padding: 3rem 1rem;
  background: var(--bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.sync-device {
  display: flex; flex-direction: column;
  align-items: center; gap: 0.5rem;
  padding: 1.5rem 2rem;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--kt-shadow-contact);
  position: relative;
  min-width: 120px;
}
.sd-label {
  font-family: var(--sans);
  font-size: 0.85rem; font-weight: 600;
  color: var(--fg);
}
.sd-detail {
  font-family: var(--sans);
  font-size: 0.65rem;
  color: var(--fg-light);
  text-align: center;
}
.sd-pulse {
  position: absolute;
  top: 8px; right: 8px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #4CAF50;
  animation: pulse-dot 2s ease infinite;
}

.sync-connector {
  display: flex; flex-direction: column;
  align-items: center; gap: 0.3rem;
  padding: 0 1rem;
  min-width: 100px;
}
.conn-line {
  width: 60px; height: 2px;
  background: linear-gradient(90deg, var(--border), var(--accent), var(--border));
  border-radius: 1px;
  position: relative;
}
.conn-line::after {
  content: '';
  position: absolute;
  top: -2px; left: 0;
  width: 8px; height: 6px;
  background: var(--accent);
  border-radius: 3px;
  animation: sync-flow 2s ease infinite;
}
@keyframes sync-flow {
  0% { left: 0; opacity: 0; }
  20% { opacity: 1; }
  80% { opacity: 1; }
  100% { left: calc(100% - 8px); opacity: 0; }
}
.conn-label {
  font-family: var(--sans);
  font-size: 0.6rem;
  color: var(--fg-light);
  text-align: center;
  line-height: 1.4;
}

.sync-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.sf-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 1.8rem 1.5rem;
  border: 1px solid var(--border);
  box-shadow: var(--kt-shadow-contact);
  transition: border-color 0.3s, box-shadow 0.3s;
}
.sf-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--kt-shadow-note);
}
.sf-icon {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}
.sf-offline { background: #FFF3E0; color: #E65100; }
.sf-smart { background: #E8F5E9; color: #2E7D32; }
.sf-arch { background: #E3F2FD; color: #1565C0; }
.sf-card h4 {
  font-size: 1rem; font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--fg);
}
.sf-card p {
  font-size: 0.82rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* ===== 05 对比 ===== */
.compare-section { background: var(--bg); }

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1.5rem;
}
.compare-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  border: 1px solid var(--border);
  box-shadow: var(--kt-shadow-contact);
  position: relative;
  overflow: hidden;
}
.compare-us {
  border-color: var(--accent);
  border-width: 2px;
  background: linear-gradient(135deg, var(--accent-glow), var(--bg-card));
}
.cc-badge {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.75rem; font-weight: 700;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 0.3rem 0.8rem;
  border-radius: 4px;
  margin-bottom: 1.2rem;
  letter-spacing: 0.05em;
}
.cc-badge-muted {
  color: var(--fg-light);
  background: rgba(0,0,0,0.04);
}
.cc-list {
  list-style: none;
  display: flex; flex-direction: column;
  gap: 0.7rem;
}
.cc-list li {
  font-size: 0.85rem;
  color: var(--fg-muted);
  display: flex; align-items: flex-start;
  gap: 0.5rem;
  line-height: 1.5;
}
.cc-check {
  color: var(--accent); font-weight: 700;
  flex-shrink: 0;
}
.cc-check.muted { color: var(--fg-light); }
.cc-cross {
  color: var(--fg-light); flex-shrink: 0;
}

/* ===== 06 下载 ===== */
.download-section {
  position: relative;
  overflow: hidden;
  background: var(--bg-warm);
  padding: 5rem 0;
}
.download-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 80%, rgba(230,81,0,0.05), transparent);
  pointer-events: none;
}
.download-inner {
  position: relative; z-index: 2;
  text-align: center;
  padding: 3rem 0;
}
.download-title {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 0.02em;
  font-size: clamp(2.2rem, 4.5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--fg);
  will-change: transform;
}
.dl-char {
  display: inline-block;
  will-change: transform, opacity;
}
.dl-char.dl-accent {
  color: var(--accent);
  font-style: italic;
  font-weight: 500;
}
.download-desc {
  font-size: clamp(1rem, 1.3vw, 1.1rem);
  color: var(--fg-muted);
  margin-top: 1rem;
}
.download-buttons {
  display: flex; gap: 1.2rem;
  justify-content: center;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}
.dl-btn {
  display: inline-flex; align-items: center; gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 2rem;
  box-shadow: var(--kt-shadow-contact);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
  will-change: transform;
}
.dl-btn:hover {
  border-color: var(--border-hover);
  box-shadow: var(--kt-shadow-note);
  transform: translateY(-2px);
}
.dl-btn-icon {
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
}
.dl-btn-info {
  display: flex; flex-direction: column; gap: 0.1rem;
  text-align: left;
}
.dl-btn-label {
  font-size: 1rem; font-weight: 600;
  color: var(--fg);
}
.dl-btn-hint {
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--fg-muted);
}
.dl-btn-arrow {
  color: var(--accent);
  transition: transform 0.3s;
}
.dl-btn:hover .dl-btn-arrow {
  transform: translateX(3px);
}
.download-note {
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--fg-light);
  margin-top: 1.5rem;
  opacity: 0.6;
}

/* ===== Footer ===== */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.footer-content {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 1rem;
}
.footer-brand {
  display: flex; align-items: baseline; gap: 0.8rem;
}
.footer-logo {
  font-family: var(--serif);
  font-size: 1.1rem; font-weight: 700;
  color: var(--fg);
}
.footer-slogan {
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--fg-muted);
}
.footer-links { display: flex; gap: 2rem; }
.footer-link {
  font-family: var(--sans);
  font-size: 0.8rem;
  color: var(--fg-muted);
  transition: color 0.3s;
}
.footer-link:hover { color: var(--fg); }
.footer-copy {
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--fg-light);
  opacity: 0.5;
}

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .real-showcase { grid-template-columns: repeat(2, 1fr); }
  .real-details { grid-template-columns: repeat(2, 1fr); }
  .sync-viz { flex-wrap: wrap; gap: 1rem; }
  .sync-connector { min-width: auto; padding: 0.5rem; }
  .conn-line { width: 40px; }
  .compare-grid { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }
  .brainstorm-features { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 700px) {
  .nav { padding: 0.6rem 1.25rem; }
  .nav-links { display: none; }
  .nav-cta { font-size: 0.72rem; padding: 0.35rem 0.8rem; }
  .hero { min-height: auto; }
  .hero-desk { min-height: 80vh; }
  .desk-note { width: 120px; font-size: 0.72rem; padding: 0.7rem 0.8rem 0.5rem; }
  .hero-title { font-size: clamp(2.2rem, 10vw, 3.5rem); }
  .section { padding: 4rem 0; }
  .real-showcase { grid-template-columns: 1fr; max-width: 300px; margin: 0 auto 2rem; }
  .real-details { grid-template-columns: 1fr; }
  .tear-playground { padding: 2rem 1rem; }
  .tear-note { width: 150px; }
  .brainstorm-desk { min-height: 300px; }
  .brain-note { width: 110px; font-size: 0.7rem; }
  .sync-viz { flex-direction: column; }
  .sync-connector { flex-direction: row; }
  .conn-line { width: 30px; height: 2px; }
  .sync-features { grid-template-columns: 1fr; }
  .brainstorm-features { grid-template-columns: 1fr; }
  .download-buttons { flex-direction: column; align-items: center; }
  .dl-btn { width: 100%; max-width: 300px; justify-content: center; }
  .footer-content { flex-direction: column; text-align: center; }
  .hero-hint { display: none; }
}