/* =========================================================
   弦外小猫 KittyEcho — 落地页（可爱·简约·年轻）
   ========================================================= */
:root {
  --ink: #1b1b1f;
  --ink-soft: #22222a;
  --muted: #6b6e76;
  --cat: #1b1b1f;
  --yellow: #fde047;
  --yellow-soft: #fef3c7;
  --slate: #5b6472;

  --bg: #fbfaf7;
  --bg-alt: #f6f4ef;
  --card: #ffffff;
  --border: #e9e6df;
  --shadow: 0 16px 38px -24px rgba(27, 27, 31, 0.28);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui,
    -apple-system, "Segoe UI", Roboto, sans-serif;

  --radius: 16px;
  --radius-lg: 22px;
  --radius-pill: 999px;
  --maxw: 1080px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--ink);
  line-height: 1.6;
  background:
    radial-gradient(1100px 560px at 100% -6%, var(--bg-alt) 0%, transparent 52%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
b { font-weight: 700; }

/* =========================================================
   通用
   ========================================================= */
.nav, main, .footer { position: relative; z-index: 1; }
section { padding-inline: 24px; }
.section-head { text-align: center; max-width: 620px; margin: 0 auto 40px; }
.section-head h2 { font-size: clamp(2rem, 1.2rem + 3.2vw, 3rem); font-weight: 800; letter-spacing: -0.02em; }
.section-head p { margin-top: 10px; color: var(--muted); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: transform var(--ease) 0.2s, box-shadow var(--ease) 0.2s, background 0.2s;
  white-space: nowrap;
}
.btn--sm { height: 44px; padding-inline: 18px; font-size: 0.9rem; }
.btn--lg { height: 54px; padding-inline: 28px; font-size: 1.05rem; }
.btn--primary {
  color: #fff;
  background: var(--ink);
  box-shadow: 0 12px 24px -14px rgba(27, 27, 31, 0.55);
}
.btn--ghost {
  color: var(--ink);
  background: #fff;
  border: 1.5px solid var(--border);
}
@media (hover: hover) {
  .btn--primary:hover { transform: translateY(-2px); box-shadow: 0 18px 30px -14px rgba(27, 27, 31, 0.6); }
  .btn--ghost:hover { transform: translateY(-2px); border-color: var(--ink); }
}
.btn:active { transform: translateY(0) scale(0.98); }

/* =========================================================
   导航
   ========================================================= */
.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: inline-flex; align-items: center; gap: 9px; min-height: 44px; }
.brand__logo { border-radius: 9px; }
.brand__name { font-weight: 800; font-size: 1.15rem; }
.brand__en { color: var(--muted); font-weight: 600; font-size: 0.85rem; }

/* =========================================================
   英雄区
   ========================================================= */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-top: clamp(20px, 4vw, 56px);
  padding-bottom: clamp(40px, 6vw, 80px);
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 40px;
}
.badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: #fff;
  border: 1.5px solid var(--border);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 30px;
}
.hero__title {
  font-size: clamp(2.3rem, 1.2rem + 4.6vw, 4rem);
  font-weight: 800;
  line-height: 1.5;
  letter-spacing: -0.03em;
}
.hero__title .hl {
  position: relative;
  color: var(--ink);
  box-shadow: inset 0 -0.32em 0 var(--yellow);
}
/* 两行标题错开排列（编辑感） */
.hero__title .hero__line { display: block; }
.hero__title .hero__line--shift { margin-left: 0.97em; }
.hero__slogan {
  margin-top: 34px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.hero__slogan-en {
  font-size: 0.9rem;
  font-style: italic;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.hero__lead {
  margin-top: 24px;
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 460px;
}
.hero__cta { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
.hero__note { margin-top: 16px; font-size: 0.85rem; color: var(--muted); }

/* 猫咪舞台 */
.stage-card {
  position: relative;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 90% at 50% 14%, #ffffff 0%, var(--bg-alt) 100%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 28px;
  min-height: 320px; /* 容纳 1.5× 放大的小猫 */
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-end;
  overflow: hidden;
}
.cat-stage {
  position: relative;
  width: 100%;
  height: 70px; /* 1.5× 小猫 + 头顶 FX 空间（压缩多余空白，整体减高） */
}

/* 头顶文案容器 — 透明无底的纵向布局，白卡下沉到各子元素上。
   未润色时润色卡随 visibility 隐藏 → 预留区透明、不露白板。 */
.cat-script {
  align-self: stretch;
  width: 100%;
  margin: 0 0 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: left;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}
/* 原文卡 / 润色卡 — 各自一张独立白卡（白底/边框/圆角/阴影/内边距） */
.cat-script .cat-original,
.cat-script .cat-polish {
  text-align: left;
  padding: 12px 16px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
/* 润色结果卡：始终占位（预留最长「高情商」文案空间），
   切换显隐只改 visibility → 隐藏时连同白底一起隐藏，卡片高度恒定不跳。 */
.cat-script .cat-polish {
  color: var(--ink);
  font-weight: 600;
  min-height: 7.2em; /* 容纳最长（高情商 4 行）文案，切换时高度不变、不跳 */
}
.cat-script .cat-polish.cat-polish--hidden { visibility: hidden; }

/* 单选组一行：模块内水平居中，略微下移 */
.cat-modes-row {
  margin-top: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
/* 润色风格单选组 */
.cat-modes {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.cat-mode {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 0 16px;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
  user-select: none;
}
.cat-mode input { accent-color: var(--ink); cursor: pointer; }
.cat-mode:has(input:checked) {
  border-color: var(--ink);
  color: var(--ink);
  background: linear-gradient(135deg, #ffffff, var(--yellow-soft));
}
@media (hover: hover) {
  .cat-mode:hover { border-color: var(--ink); }
}

/* 平台引导提示 */
.cat-hint {
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 14px;
  text-align: center;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.01em;
  user-select: none;
  white-space: nowrap;
}
/* 文字两端各一段渐变线（向外淡出），文字处留空、线不穿过文字 */
.cat-hint::before,
.cat-hint::after {
  content: "";
  flex: 1;
  height: 1px;
}
.cat-hint::before { background: linear-gradient(90deg, transparent, rgba(27,27,31,0.14)); }
.cat-hint::after  { background: linear-gradient(90deg, rgba(27,27,31,0.14), transparent); }

/* 喇叭开关（浮在卡片右上角，叠加于文案气泡之上，圆角按钮，炭黑描边 + 猫咪黄点缀） */
.cat-mute {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 5;
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  padding: 0;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  color: var(--ink);
  transition: transform var(--ease) 0.2s, border-color 0.2s, box-shadow 0.2s, background 0.2s;
}
@media (hover: hover) {
  .cat-mute:hover { transform: translateY(-2px); border-color: var(--ink); }
}
.cat-mute:active { transform: scale(0.94); }
.cat-mute:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(253, 224, 71, 0.5); }
.cat-mute svg { display: block; }
.cat-mute--on {
  border-color: var(--ink);
  background: linear-gradient(135deg, #ffffff, var(--yellow-soft));
}
.stage-ground {
  display: none; /* 移除会横穿提示文字的独立灰线；分隔线改由 .cat-hint 两端渐变线呈现 */
}

/* =========================================================
   功能区
   ========================================================= */
.features { max-width: var(--maxw); margin: 0 auto; padding-block: clamp(40px, 6vw, 80px); }
.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.feat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: transform var(--ease) 0.25s, border-color 0.25s;
}
@media (hover: hover) {
  .feat:hover { transform: translateY(-3px); border-color: var(--ink); }
}
.feat__emoji {
  width: 46px; height: 46px;
  display: grid; place-items: center;
  background: var(--bg-alt);
  border-radius: 12px;
  margin-bottom: 14px;
}
.feat__emoji svg { width: 26px; height: 26px; display: block; }
.feat h3 { font-size: 1.08rem; font-weight: 800; }
.feat p { margin-top: 8px; color: var(--muted); font-size: 0.93rem; }

/* =========================================================
   下载区
   ========================================================= */
.download { max-width: var(--maxw); margin: 0 auto; padding-block: clamp(20px, 4vw, 56px) clamp(56px, 8vw, 100px); }
.download__box {
  text-align: center;
  border-radius: var(--radius-lg);
  padding: clamp(34px, 5vw, 60px) 24px;
  background:
    radial-gradient(120% 120% at 50% 0%, #ffffff 0%, var(--bg-alt) 100%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.download__box h2 { font-size: clamp(1.6rem, 1rem + 2.5vw, 2.4rem); font-weight: 800; }
.download__hint { margin-top: 10px; color: var(--muted); }
.download__hint b { color: var(--ink); box-shadow: inset 0 -0.3em 0 var(--yellow); }
.download__grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  max-width: 880px;
  margin: 28px auto 0;
}
.dl-btn {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px 12px 14px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform var(--ease) 0.22s, border-color 0.22s, box-shadow 0.22s;
}
.dl-btn__icon { width: 26px; height: 26px; color: var(--cat); transition: transform var(--ease) 0.22s; }
@media (hover: hover) {
  .dl-btn:hover { transform: translateY(-4px); border-color: var(--ink); }
  .dl-btn:hover .dl-btn__icon { transform: translateY(-2px) scale(1.1); }
}
.dl-btn:active { transform: scale(0.97); border-color: var(--ink); }
.dl-btn__label { font-weight: 800; font-size: 0.98rem; }
.dl-btn__sub { font-size: 0.72rem; color: var(--muted); }

.dl-btn--recommended {
  border-color: var(--ink);
  background: linear-gradient(135deg, #ffffff, var(--yellow-soft));
  box-shadow: 0 0 0 3px rgba(253, 224, 71, 0.45), 0 20px 40px -24px rgba(27, 27, 31, 0.4);
}
.dl-btn--recommended::after {
  content: "推荐";
  position: absolute;
  top: -11px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 11px;
  font-weight: 800;
  color: var(--ink);
  background: var(--yellow);
  padding: 2px 11px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}
.download__free { margin-top: 22px; font-size: 0.85rem; color: var(--muted); }

/* =========================================================
   页脚
   ========================================================= */
.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 24px 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.85rem;
}

/* =========================================================
   小猫全效果动画（移植自 WordTaker CatSkinFx）
   ========================================================= */
.cs-runner { position: absolute; bottom: 6px; left: 0; transform-origin: left bottom; will-change: transform; pointer-events: none; }
.cs-sleeper { position: absolute; bottom: 6px; transform-origin: left bottom; will-change: transform; pointer-events: none; }
.cs-leg { transform-box: fill-box; transform-origin: 50% 0; }
.cs-la { animation: cs-legA .3s ease-in-out infinite; }
.cs-lb { animation: cs-legB .3s ease-in-out infinite; }
.cs-tail { transform-box: fill-box; transform-origin: 88% 88%; animation: cs-wag .5s ease-in-out infinite; }
@keyframes cs-legA { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-2.4px); } }
@keyframes cs-legB { 0%,100% { transform: translateY(-2.4px); } 50% { transform: translateY(0); } }
@keyframes cs-wag { 0%,100% { transform: rotate(0); } 50% { transform: rotate(-15deg); } }

/* ===== 头顶斜上方效果 (catfx)：音符 / 灯泡 / 闪光 / 汗滴 ===== */
.cs-fx { position: absolute; bottom: 30px; left: 0; pointer-events: none; will-change: transform; }
.cs-fxnt { position: absolute; left: 0; top: 0; line-height: 1; will-change: transform, opacity; animation: csfxRiseRand var(--dur, 1.3s) ease-out forwards; }
@keyframes csfxRiseRand { 0% { transform: translate(0,2px) scale(.55) rotate(0); opacity: 0; } 25% { opacity: 1; } 100% { transform: translate(var(--dx,0px), var(--dy,-14px)) scale(1) rotate(var(--rot,0deg)); opacity: 0; } }
.cs-fxbulb, .cs-fxstar, .cs-fxsweat { position: absolute; left: 0; display: block; }
.cs-fx-bob { animation: csfxBob 1s ease-in-out infinite; }
@keyframes csfxBob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-3px); } }
.cs-fx-tw { animation: csfxTw 1.1s ease-in-out infinite; transform-origin: center; }
@keyframes csfxTw { 0%,100% { transform: scale(.8) rotate(0); } 50% { transform: scale(1.15) rotate(45deg); } }

/* ===== 睡眠 Zzz：三个升序 Z，贴卧睡头顶 ===== */
.cs-fxzz { position: absolute; font-weight: 700; color: var(--slate); text-shadow: 0 1px 0 rgba(255,255,255,.6); line-height: 1; pointer-events: none; will-change: transform, opacity; animation: csfxZz 3s ease-in-out infinite; }
.cs-fxzz-s { font-size: 8px; }
.cs-fxzz-m { font-size: 10px; }
.cs-fxzz-l { font-size: 12px; }
@keyframes csfxZz { 0% { transform: translate(0,1px) scale(.85); opacity: 0; } 25% { opacity: 1; } 100% { transform: translate(calc(var(--zdir,-1) * 3px), -5px) scale(1); opacity: 0; } }

/* =========================================================
   响应式
   ========================================================= */
/* 平板 / 中屏：并排堆叠为单列、网格降列 */
@media (max-width: 1024px) {
  .hero { grid-template-columns: 1fr; text-align: center; gap: 28px; }
  .hero__lead { margin-inline: auto; }
  .hero__cta { justify-content: center; }
  .features__grid { grid-template-columns: 1fr 1fr; }
  .download__grid { grid-template-columns: repeat(3, 1fr); max-width: 560px; }
}
/* 手机：单列、收窄间距、防溢出 */
@media (max-width: 480px) {
  section { padding-inline: 16px; }
  .nav { padding: 14px 16px; }
  .features__grid { grid-template-columns: 1fr; }
  .download__grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stage-card { min-height: 260px; padding: 22px; }
  .cat-stage { height: 130px; }
  .hero__lead, .hero__title, .download__hint { overflow-wrap: anywhere; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}