/* =========================================================
   词之道 WordPath — 官网样式
   设计令牌与 App 完全同源（frontend/lib/theme/app_tokens.dart）
   ========================================================= */

:root{
  /* 品牌 */
  --brand:#008989;
  --brand-press:#007070;
  --brand-soft:#E0F2F2;
  --brand-ink:#00615F;
  --brand-deep:#004C4B;
  --ai:#6558B9;
  --growth:#C47C27;

  /* 表面 */
  --page:#F6F4EF;
  --card:#FCFBF8;
  --fill:#F0EEE8;
  --fill-2:#E7E5DE;
  --border:#E7E3DA;
  --hair:rgba(47,90,68,.08);

  /* 文字 */
  --ink:#111827;
  --ink-2:#2B3445;
  --body:#5B6475;
  --aux:#586575;

  --r-xs:8px;
  --r-sm:12px;
  --r-md:16px;
  --r-lg:24px;
  --r-xl:32px;

  --shadow-card:0 14px 34px -18px rgba(59,97,81,.28), 0 3px 8px -4px rgba(59,97,81,.06);
  --shadow-hi:0 36px 70px -30px rgba(59,97,81,.34), 0 12px 24px -16px rgba(59,97,81,.14);
  --shadow-phone:0 48px 80px -36px rgba(16,58,52,.42), 0 18px 34px -22px rgba(16,58,52,.24);

  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-spring:cubic-bezier(.34,1.32,.64,1);
  --max:1200px;

  --font-sans:"PingFang SC","HarmonyOS Sans SC","Noto Sans SC","Source Han Sans SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --font-serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Songti SC","Source Han Serif SC","Noto Serif SC",serif;
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:88px;
  /* 装饰圆环（.ring--2 旋转）会把轴对齐包围盒撑大，导致移动端出现横向可拖拽区域。
     用 clip 而不是 hidden：不建立滚动容器，安全保留 .faq__head 的 sticky。 */
  overflow-x:clip;
}

body{
  margin:0;
  font-family:var(--font-sans);
  background:var(--page);
  color:var(--ink);
  line-height:1.7;
  overflow-x:hidden;
  overflow-x:clip;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,p,figure,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
em{font-style:normal}
::selection{background:rgba(0,137,137,.18)}

:focus-visible{
  outline:2px solid var(--brand);
  outline-offset:3px;
  border-radius:6px;
}

.wrap{
  width:100%;
  max-width:var(--max);
  margin:0 auto;
  padding:0 clamp(18px,4vw,28px);
}

.icon{width:22px;height:22px;flex:none}
.icon--sm{width:16px;height:16px}
.sprite{position:absolute;width:0;height:0;overflow:hidden}

/* ---------------- 背景 ---------------- */
.bg-field{
  position:fixed;
  inset:0;
  z-index:-1;
  overflow:hidden;
  background:
    linear-gradient(180deg,#F0F8F5 0%,#F8F5F0 52%,#F6F4EF 100%);
}
.glow{
  position:absolute;
  border-radius:50%;
  filter:blur(60px);
  will-change:transform;
}
.glow--a{
  width:56vw;height:56vw;left:-10vw;top:-12vw;
  background:radial-gradient(circle,rgba(101,200,188,.42),rgba(101,200,188,0) 68%);
  animation:drift-a 26s ease-in-out infinite;
}
.glow--b{
  width:48vw;height:48vw;right:-12vw;top:16vh;
  background:radial-gradient(circle,rgba(126,142,219,.26),rgba(126,142,219,0) 68%);
  animation:drift-b 32s ease-in-out infinite;
}
.glow--c{
  width:52vw;height:52vw;left:18vw;bottom:-22vw;
  background:radial-gradient(circle,rgba(181,216,157,.32),rgba(181,216,157,0) 68%);
  animation:drift-c 30s ease-in-out infinite;
}
.grain{
  position:absolute;inset:0;
  opacity:.035;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.7' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode:multiply;
  pointer-events:none;
}
@keyframes drift-a{
  0%,100%{transform:translate3d(0,0,0) scale(1)}
  50%{transform:translate3d(6vw,4vh,0) scale(1.08)}
}
@keyframes drift-b{
  0%,100%{transform:translate3d(0,0,0) scale(1)}
  50%{transform:translate3d(-5vw,-6vh,0) scale(1.12)}
}
@keyframes drift-c{
  0%,100%{transform:translate3d(0,0,0) scale(1)}
  50%{transform:translate3d(4vw,-3vh,0) scale(1.06)}
}

/* ---------------- 顶部进度 / 导航 ---------------- */
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:90;
  background:transparent;pointer-events:none;
}
.scroll-progress i{
  display:block;height:100%;width:100%;
  transform:scaleX(var(--sp,0));
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--brand),#59BFAF 60%,var(--growth));
  opacity:.8;
}

.nav{
  position:fixed;top:0;left:0;right:0;z-index:80;
  transition:background .35s var(--ease),box-shadow .35s var(--ease),border-color .35s;
  border-bottom:1px solid transparent;
}
.nav__inner{
  max-width:var(--max);margin:0 auto;
  padding:0 clamp(18px,4vw,28px);
  height:78px;
  display:flex;align-items:center;justify-content:space-between;gap:clamp(16px,3vw,40px);
  transition:height .35s var(--ease);
}
.nav.is-scrolled{
  background:rgba(250,248,244,.78);
  -webkit-backdrop-filter:blur(18px) saturate(1.3);
  backdrop-filter:blur(18px) saturate(1.3);
  border-bottom-color:var(--hair);
  box-shadow:0 10px 30px -24px rgba(47,90,68,.5);
}
.nav.is-scrolled .nav__inner{height:64px}

.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand img{
  width:36px;height:36px;border-radius:9px;
  box-shadow:0 6px 14px -8px rgba(0,76,75,.6);
}
.brand__text{
  display:flex;flex-direction:column;line-height:1.1;
  font-weight:700;font-size:1.02rem;letter-spacing:.01em;
}
.brand__text em{
  font-family:var(--font-serif);
  font-size:.6rem;font-weight:400;letter-spacing:.18em;
  color:var(--aux);text-transform:uppercase;margin-top:2px;
}

.nav__links{display:flex;align-items:center;gap:clamp(14px,2.2vw,30px)}
.nav__links a{
  position:relative;font-size:.9rem;color:var(--body);
  padding:6px 0;transition:color .25s var(--ease);
}
.nav__links a::after{
  content:"";position:absolute;left:50%;right:50%;bottom:0;height:2px;
  background:var(--brand);border-radius:2px;
  transition:left .3s var(--ease),right .3s var(--ease);
}
.nav__links a:hover{color:var(--ink)}
.nav__links a:hover::after{left:0;right:0}

.nav__actions{display:flex;align-items:center;gap:10px}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:42px;padding:0 20px;border-radius:999px;
  font-size:.9rem;font-weight:600;
  transition:transform .2s var(--ease),background .25s,box-shadow .25s,color .25s;
}
.btn--ghost{
  border:1px solid var(--border);
  background:rgba(252,251,248,.7);
  color:var(--ink-2);
  box-shadow:0 2px 6px rgba(47,90,68,.04);
}
.btn--ghost:hover{
  background:var(--brand);color:#fff;border-color:var(--brand);
  box-shadow:var(--shadow-card);transform:translateY(-1px);
}
.btn--primary{
  background:var(--brand);color:#fff;height:46px;padding:0 26px;
  box-shadow:0 12px 24px -14px rgba(0,137,137,.8);
}
.btn--primary:hover{background:var(--brand-press);transform:translateY(-1px)}

.nav__toggle{
  display:none;width:42px;height:42px;border-radius:12px;
  align-items:center;justify-content:center;
  border:1px solid var(--border);background:rgba(252,251,248,.7);
}

/* 移动菜单 */
.mobile-menu{
  position:fixed;inset:0;z-index:75;
  background:rgba(246,244,239,.96);
  -webkit-backdrop-filter:blur(20px);
  backdrop-filter:blur(20px);
  padding:96px clamp(20px,6vw,32px) 40px;
  display:flex;flex-direction:column;gap:28px;
  opacity:0;visibility:hidden;transform:translateY(-8px);
  transition:opacity .32s var(--ease),transform .32s var(--ease),visibility .32s;
}
.mobile-menu.is-open{opacity:1;visibility:visible;transform:none}
.mobile-menu nav{display:flex;flex-direction:column}
.mobile-menu nav a{
  display:flex;align-items:baseline;gap:14px;
  padding:16px 0;border-bottom:1px solid var(--border);
  font-size:1.35rem;font-weight:600;
}
.mobile-menu nav a span{
  font-family:var(--font-serif);font-size:.75rem;color:var(--brand);
  letter-spacing:.1em;
}
.mobile-menu__stores{display:flex;gap:10px;flex-wrap:wrap}
.mobile-menu__stores .store-btn{flex:1;min-width:150px}

/* ---------------- Hero ---------------- */
.hero{
  position:relative;
  padding:clamp(112px,13vw,150px) 0 56px;
  min-height:100svh;
  display:flex;flex-direction:column;justify-content:center;
}
.hero__inner{
  width:100%;max-width:var(--max);margin:0 auto;
  padding:0 clamp(18px,4vw,28px);
  display:grid;
  grid-template-columns:1.02fr .98fr;
  align-items:center;
  gap:clamp(24px,4vw,56px);
}

.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.76rem;letter-spacing:.12em;color:var(--brand-ink);
  background:rgba(224,242,242,.7);
  border:1px solid rgba(0,137,137,.12);
  padding:6px 13px;border-radius:999px;
  margin-bottom:22px;
}
.eyebrow .dot{
  width:6px;height:6px;border-radius:50%;background:var(--brand);
  box-shadow:0 0 0 0 rgba(0,137,137,.5);
  animation:pulse-dot 2.4s ease-out infinite;
}
@keyframes pulse-dot{
  0%{box-shadow:0 0 0 0 rgba(0,137,137,.45)}
  70%{box-shadow:0 0 0 8px rgba(0,137,137,0)}
  100%{box-shadow:0 0 0 0 rgba(0,137,137,0)}
}
.eyebrow--light{
  color:#BFE7DE;background:rgba(255,255,255,.08);
  border-color:rgba(255,255,255,.16);
}
.eyebrow--light .dot{background:#7FD8C6}

.hero__title{
  font-size:clamp(2.55rem,5.4vw,4.5rem);
  line-height:1.12;
  font-weight:700;
  letter-spacing:-.02em;
  margin-bottom:24px;
}
.mark{position:relative;color:var(--brand);display:inline-block}
.mark__line{
  position:absolute;left:-1%;bottom:-.1em;width:102%;height:.26em;
  color:var(--brand);opacity:.55;overflow:visible;
}
.mark__line path{
  stroke-dasharray:260;stroke-dashoffset:260;
  animation:draw 1.4s .7s var(--ease) forwards;
}
@keyframes draw{to{stroke-dashoffset:0}}

.hero__lede{
  font-size:clamp(1rem,1.15vw,1.09rem);
  color:var(--body);
  max-width:33em;
  margin-bottom:34px;
}

.store-row{display:flex;gap:12px;flex-wrap:wrap}
.store-btn{
  position:relative;
  display:inline-flex;align-items:center;gap:11px;
  padding:11px 18px 11px 16px;
  border-radius:16px;
  background:var(--ink);
  color:#fff;
  box-shadow:0 14px 28px -18px rgba(17,24,39,.9), 0 2px 6px rgba(17,24,39,.12);
  transition:transform .24s var(--ease),box-shadow .24s var(--ease),background .24s;
  min-width:184px;
}
.store-btn:hover{
  transform:translateY(-2px);
  box-shadow:0 20px 34px -18px rgba(17,24,39,.75);
}
.store-btn:active{transform:translateY(0) scale(.985)}
.store-btn__logo{width:26px;height:26px;opacity:.95}
.store-btn__text{display:flex;flex-direction:column;line-height:1.15;text-align:left}
.store-btn__text em{font-size:.6rem;letter-spacing:.06em;opacity:.66;font-style:normal}
.store-btn__text strong{font-size:1.02rem;font-weight:600;letter-spacing:.01em}
.store-btn__badge{
  margin-left:auto;font-size:.56rem;letter-spacing:.09em;
  padding:2px 6px;border-radius:5px;
  background:rgba(255,255,255,.14);color:rgba(255,255,255,.8);
}
.store-btn--alt{
  background:var(--brand-soft);
  color:var(--brand-ink);
  border:1px solid rgba(0,137,137,.16);
  box-shadow:0 12px 24px -18px rgba(0,97,95,.7);
}
.store-btn--alt .store-btn__badge{background:rgba(0,137,137,.12);color:var(--brand-ink)}
.store-btn--alt .store-btn__text em{opacity:.7}
.store-btn--alt:hover{background:#D5EDED}
.store-btn--sm{min-width:0;padding:9px 14px;border-radius:13px}
.store-btn--sm .store-btn__logo{width:20px;height:20px}
.store-btn--sm .store-btn__text strong{font-size:.9rem}
.store-btn--sm .store-btn__text em{font-size:.55rem}

.hero__meta{
  display:flex;flex-wrap:wrap;gap:8px 22px;
  margin-top:26px;font-size:.82rem;color:var(--aux);
}
.hero__meta li{display:flex;align-items:center;gap:6px}
.hero__meta .icon{color:var(--brand);width:14px;height:14px}

/* Hero 视觉舞台 */
.hero__visual{
  position:relative;
  min-height:clamp(520px,58vw,660px);
  display:flex;align-items:center;justify-content:center;
  perspective:1400px;
}
.halo{
  position:absolute;width:min(520px,86%);aspect-ratio:1;
  border-radius:50%;
  background:radial-gradient(circle at 50% 45%,rgba(0,137,137,.20),rgba(0,137,137,.06) 48%,transparent 70%);
  filter:blur(6px);
  animation:halo-breathe 9s ease-in-out infinite;
}
@keyframes halo-breathe{
  0%,100%{transform:scale(1);opacity:.9}
  50%{transform:scale(1.06);opacity:1}
}
.ring{
  position:absolute;border-radius:50%;
  border:1px dashed rgba(0,137,137,.22);
}
.ring--1{width:min(470px,80%);aspect-ratio:1;animation:spin 70s linear infinite}
.ring--2{width:min(600px,96%);aspect-ratio:1;border-style:solid;border-color:rgba(0,137,137,.09);animation:spin 110s linear infinite reverse}
@keyframes spin{to{transform:rotate(360deg)}}

.phone{
  position:relative;
  container-type:inline-size;
  width:clamp(238px,23vw,302px);
  filter:drop-shadow(0 24px 40px rgba(13,50,46,.18));
}
.phone--hero{
  transform:rotateY(-9deg) rotateX(2deg) rotateZ(-.6deg);
  transform-style:preserve-3d;
  animation:hero-phone-in 1.2s .15s var(--ease) both;
  z-index:2;
}
@keyframes hero-phone-in{
  from{opacity:0;transform:rotateY(-20deg) rotateX(6deg) translateY(28px) scale(.96)}
  to{opacity:1;transform:rotateY(-9deg) rotateX(2deg) rotateZ(-.6deg) translateY(0) scale(1)}
}
.phone__frame{
  position:relative;
  aspect-ratio:9/19.4;
  border-radius:clamp(34px,10.4cqw,44px);
  padding:clamp(7px,2.4cqw,10px);
  background:linear-gradient(160deg,#26302f,#0e1414 45%,#1b2423);
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,.14),
    inset 0 0 0 3px rgba(0,0,0,.55),
    var(--shadow-phone);
  overflow:hidden;
}
.phone__island{
  position:absolute;top:clamp(9px,3.1cqw,13px);left:50%;transform:translateX(-50%);
  width:30%;height:clamp(17px,5.6cqw,23px);
  background:#080d0d;border-radius:999px;z-index:5;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.06);
}
.phone__screen{
  position:relative;
  width:100%;height:100%;
  border-radius:clamp(28px,8.6cqw,37px);
  overflow:hidden;
  background:linear-gradient(180deg,#E4F2EF 0%,#F6F4EF 42%,#FCFBF8 100%);
  font-size:4.15cqw;
  line-height:1.45;
  display:flex;flex-direction:column;
}
.sb{
  display:flex;align-items:center;justify-content:space-between;
  padding:.72em 1.5em .1em 1.6em;
  font-size:.8em;font-weight:600;color:var(--ink);
  letter-spacing:.01em;
}
.sb__icons{display:flex;align-items:center;gap:.22em}
.sb__i{width:1.05em;height:.75em;color:var(--ink)}
.sb__i--w{width:1.05em}
.sb__i--b{width:1.5em;height:.72em}

.screen{
  flex:1;display:flex;flex-direction:column;
  padding:0 1.25em;
  gap:.78em;
  min-height:0;
}
.screen--home > *,
.screen--books > *,
.screen--growth > *{flex:none}

/* Hero 首页 */
.screen--home{padding-bottom:.8em}
.home__top{display:flex;align-items:flex-start;justify-content:space-between;padding-top:.5em}
.hi{font-size:1.42em;font-weight:700;letter-spacing:-.01em;line-height:1.3}
.hi__sub{font-size:.86em;color:var(--aux);margin-top:.1em}
.avatar{
  width:2.4em;height:2.4em;border-radius:50%;
  background:linear-gradient(140deg,#BFE7DE,#7FC7B9);
  display:grid;place-items:center;
  font-size:1em;font-weight:600;color:#0B4A44;
  box-shadow:0 0 0 .12em rgba(255,255,255,.7);
}

.mcard{
  background:var(--card);
  border-radius:.9em;
  padding:.95em;
  box-shadow:0 .5em 1.4em -.7em rgba(59,97,81,.3), 0 0 0 1px rgba(47,90,68,.04);
}
.today{padding-bottom:.7em}
.today__top{display:flex;align-items:center;gap:.9em}
.ring-progress{position:relative;width:5.1em;height:5.1em;flex:none}
.ring-progress svg{width:100%;height:100%;transform:rotate(-90deg)}
.rp__track{fill:none;stroke:#EDF3EF;stroke-width:4.2}
.rp__bar{
  fill:none;stroke:var(--brand);stroke-width:4.2;stroke-linecap:round;
  stroke-dasharray:113;
  stroke-dashoffset:113;
  transition:stroke-dashoffset 1.6s var(--ease);
}
.rp__label{
  position:absolute;inset:0;display:flex;align-items:baseline;justify-content:center;
  gap:.05em;font-size:.82em;font-weight:700;letter-spacing:-.02em;
}
.rp__label span{font-size:.52em;color:var(--aux);font-weight:500;letter-spacing:0}
.today__nums{min-width:0}
.today__nums .k{font-size:.8em;color:var(--aux)}
.today__nums .v{font-size:1.5em;font-weight:700;line-height:1.2;letter-spacing:-.01em}
.today__nums .v small{font-size:.5em;font-weight:500;color:var(--aux);margin-left:.2em}
.today__nums .k--sm{margin-top:.15em;font-size:.72em;color:#7C8798}
.today__stats{
  display:grid;grid-template-columns:repeat(3,1fr);
  margin-top:.85em;padding-top:.7em;
  border-top:1px solid var(--hair);
  text-align:center;
}
.today__stats b{display:block;font-size:1.02em;font-weight:700;letter-spacing:-.01em}
.today__stats .hot{color:var(--growth)}
.today__stats span{font-size:.7em;color:var(--aux)}

.bookcard .bookcard__row{display:flex;align-items:center;gap:.65em}
.bookcard__art{
  width:2.6em;height:2.6em;border-radius:.7em;overflow:hidden;flex:none;
  background:#EAF4EF;display:grid;place-items:center;
}
.bookcard__art img{width:100%;height:100%;object-fit:cover}
.bookcard__text{min-width:0;flex:1}
.bookcard__text .k{font-size:.72em;color:var(--aux)}
.bookcard__text .v{font-size:.95em;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pill{
  font-size:.68em;padding:.28em .7em;border-radius:999px;
  background:var(--fill);color:var(--body);flex:none;font-weight:500;
}
.pill--brand{background:var(--brand-soft);color:var(--brand-ink)}
.bar{
  height:.38em;border-radius:999px;background:var(--fill);
  margin-top:.65em;overflow:hidden;
}
.bar i{
  display:block;height:100%;width:var(--p,40%);border-radius:inherit;
  background:linear-gradient(90deg,#2FB09A,var(--brand));
  transform-origin:0 50%;
  animation:bar-in 1.4s .5s var(--ease) both;
}
@keyframes bar-in{from{transform:scaleX(0)}to{transform:scaleX(1)}}
.bar--thin{height:.3em;margin-top:.55em}
.bookcard__foot{
  display:flex;justify-content:space-between;
  font-size:.66em;color:var(--aux);margin-top:.4em;
}

.quick{display:grid;grid-template-columns:repeat(4,1fr);gap:.4em;text-align:center}
.quick__item{display:flex;flex-direction:column;align-items:center;gap:.4em;font-size:.72em;color:var(--ink-2)}
.qi{
  width:2.55em;height:2.55em;border-radius:.8em;
  display:grid;place-items:center;
}
.qi .icon{width:1.25em;height:1.25em}
.qi--brand{background:var(--brand-soft);color:var(--brand-ink)}
.qi--mint{background:#E2F6EE;color:#00705A}
.qi--ai{background:#EFEDFA;color:var(--ai)}
.qi--gold{background:#FBF0DF;color:var(--growth)}

.sec-title{font-size:.82em;font-weight:600;color:var(--ink);margin-top:.15em}
.strip{
  display:flex;align-items:center;gap:.6em;
  background:var(--card);border-radius:.75em;padding:.55em .7em;
  box-shadow:0 .35em 1em -.7em rgba(59,97,81,.28), 0 0 0 1px rgba(47,90,68,.04);
}
.strip__art{width:1.9em;height:1.9em;border-radius:.5em;overflow:hidden;flex:none}
.strip__art img{width:100%;height:100%;object-fit:cover}
.strip b{display:block;font-size:.8em;font-weight:600;line-height:1.3}
.strip i{display:block;font-size:.66em;color:var(--aux);font-style:normal}
.strip__chev{width:1em;height:1em;color:#A9B3C0;margin-left:auto;transform:rotate(-90deg)}

.tabbar{
  margin-top:auto;
  display:flex;justify-content:space-around;align-items:center;
  padding:.55em 0 .1em;
  border-top:1px solid var(--hair);
}
.tabbar__item{display:flex;flex-direction:column;align-items:center;gap:.15em;font-size:.62em;color:#9AA5B4}
.tabbar__item .icon{width:1.45em;height:1.45em}
.tabbar__item.is-on{color:var(--brand)}

/* 浮动卡片 */
.float{
  position:absolute;
  display:flex;align-items:center;gap:10px;
  background:rgba(252,251,248,.9);
  -webkit-backdrop-filter:blur(14px) saturate(1.2);
  backdrop-filter:blur(14px) saturate(1.2);
  border:1px solid rgba(255,255,255,.85);
  border-radius:16px;
  padding:11px 15px;
  box-shadow:0 22px 40px -26px rgba(47,90,68,.55), 0 2px 8px rgba(47,90,68,.05);
  z-index:3;
  translate:var(--px,0) var(--py,0);
  will-change:translate;
}
.float__k{font-size:.66rem;color:var(--aux);letter-spacing:.02em;line-height:1.4}
.float__v{font-size:.82rem;font-weight:600;color:var(--ink);line-height:1.4}
.float__ico{
  width:32px;height:32px;border-radius:10px;display:grid;place-items:center;flex:none;
}
.float__ico .icon{width:17px;height:17px}
.float__ico--mint{background:#E2F6EE;color:#00705A}
.float--review{left:-8%;top:20%;animation:floaty 7s ease-in-out infinite}
.float--stat{right:-4%;top:8%;flex-direction:column;align-items:flex-start;gap:2px;padding:12px 16px;animation:floaty 8.5s .6s ease-in-out infinite}
.float__big{font-family:var(--font-serif);font-size:1.5rem;line-height:1.1;color:var(--brand-ink);font-weight:600}
.float__big em{font-family:var(--font-sans);font-size:.6rem;color:var(--aux);margin-left:2px;font-weight:500}
.sparkline{width:88px;height:26px;color:#2FB09A;margin-top:2px}
.sparkline svg{width:100%;height:100%;display:block}
.float__ping{
  position:absolute;top:8px;right:8px;width:6px;height:6px;border-radius:50%;
  background:var(--growth);
  box-shadow:0 0 0 0 rgba(196,124,39,.4);
  animation:pulse-gold 2.4s ease-out infinite;
}
@keyframes pulse-gold{
  0%{box-shadow:0 0 0 0 rgba(196,124,39,.4)}
  70%{box-shadow:0 0 0 7px rgba(196,124,39,0)}
  100%{box-shadow:0 0 0 0 rgba(196,124,39,0)}
}
@keyframes floaty{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-10px)}
}
.art-float{
  position:absolute;border-radius:26%;
  box-shadow:0 18px 30px -18px rgba(47,90,68,.5);
  translate:var(--px,0) var(--py,0);
  will-change:translate;
}
.art-float--globe{right:6%;bottom:3%;width:clamp(48px,5.4vw,76px);animation:floaty 9s .9s ease-in-out infinite;transform:rotate(-8deg)}
.art-float--seed{left:10%;top:2%;width:clamp(38px,4vw,58px);animation:floaty 8s .2s ease-in-out infinite;transform:rotate(7deg)}

.scroll-hint{
  display:inline-flex;align-items:center;gap:8px;
  margin:clamp(8px,2vw,28px) auto 0;
  font-size:.76rem;letter-spacing:.1em;color:var(--aux);
  opacity:.75;transition:opacity .3s,color .3s;
}
.scroll-hint:hover{opacity:1;color:var(--brand-ink)}
.scroll-hint .icon{width:15px;height:15px;animation:nudge 2.4s ease-in-out infinite}
@keyframes nudge{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(4px)}
}

/* ---------------- 数据条 ---------------- */
.stats{padding:clamp(20px,4vw,44px) 0 clamp(10px,2vw,20px)}
.stats__grid{
  display:grid;grid-template-columns:repeat(4,1fr);
  background:rgba(252,251,248,.62);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  overflow:hidden;
}
.stat{
  padding:clamp(20px,3vw,32px) clamp(16px,2.4vw,28px);
  border-right:1px solid var(--hair);
}
.stat:last-child{border-right:0}
.stat b{
  display:block;
  font-family:var(--font-serif);
  font-size:clamp(1.9rem,3.2vw,2.6rem);
  font-weight:500;line-height:1;
  color:var(--brand-ink);
  letter-spacing:-.01em;
}
.stat b.stat__grade{font-size:clamp(1.5rem,2.5vw,2.05rem);letter-spacing:.01em;font-family:var(--font-sans);font-weight:600}
.stat span{display:block;margin-top:8px;font-size:.9rem;font-weight:600;color:var(--ink-2)}
.stat em{display:block;margin-top:4px;font-size:.74rem;color:var(--aux);letter-spacing:.02em}

/* ---------------- 通用 section ---------------- */
.section{padding:clamp(64px,9vw,120px) 0;position:relative}
.sec-head{max-width:720px;margin-bottom:clamp(36px,5vw,58px)}
.sec-head--center{margin-left:auto;margin-right:auto;text-align:center}
.sec-head--center .eyebrow{margin-bottom:18px}
.sec-title-lg{
  font-size:clamp(1.85rem,3.4vw,2.9rem);
  line-height:1.22;font-weight:700;letter-spacing:-.02em;
  margin-bottom:16px;
}
.sec-title-lg em{color:var(--brand)}
.sec-lede{color:var(--body);font-size:clamp(.95rem,1.1vw,1.02rem);max-width:38em}
.sec-head--center .sec-lede{margin:0 auto}

/* ---------------- Bento 功能 ---------------- */
.bento{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{
  position:relative;
  display:flex;flex-direction:column;
  background:var(--card);
  border-radius:var(--r-lg);
  padding:clamp(20px,2.4vw,28px);
  box-shadow:var(--shadow-card), 0 0 0 1px rgba(47,90,68,.05);
  overflow:hidden;
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.card > *{flex:none}
.card__foot{
  margin-top:auto;padding-top:18px;
  display:flex;align-items:center;gap:6px;
  font-size:.76rem;color:var(--aux);
}
.card__foot .icon{width:14px;height:14px;color:var(--brand)}
.card::before{
  content:"";position:absolute;inset:0;border-radius:inherit;
  background:radial-gradient(240px circle at var(--mx,50%) var(--my,0%),rgba(0,137,137,.09),transparent 70%);
  opacity:0;transition:opacity .4s var(--ease);pointer-events:none;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hi)}
.card:hover::before{opacity:1}
.card--wide{grid-column:span 2}
.card--sync{grid-column:span 3;display:flex;flex-direction:row;align-items:center;gap:clamp(18px,3vw,36px)}
.card--sync .card__ico{margin-bottom:0;flex:none}
.sync__copy{flex:1;min-width:0}
.sync__copy h3{margin-bottom:6px}
.card h3{font-size:1.06rem;font-weight:600;letter-spacing:-.01em;margin-bottom:8px}
.card p{font-size:.87rem;color:var(--body);line-height:1.72}
.card__ico{
  display:inline-grid;place-items:center;
  width:40px;height:40px;border-radius:12px;margin-bottom:16px;
}
.card__ico .icon{width:20px;height:20px}
.card__ico--brand{background:var(--brand-soft);color:var(--brand-ink)}
.card__ico--gold{background:#FBF0DF;color:var(--growth)}
.card__ico--ai{background:#EFEDFA;color:var(--ai)}
.card__ico--mint{background:#E2F6EE;color:#00705A}
.card__ico--ink{background:#E9EDF3;color:#3B4757}
.card__head{display:flex;gap:14px;align-items:flex-start;margin-bottom:20px}
.card__head .card__ico{margin-bottom:0;flex:none}
.card__head h3{margin-bottom:6px}

/* 记忆阶梯 */
.ladder{
  position:relative;
  display:grid;grid-template-columns:repeat(7,1fr);
  padding-top:4px;
}
.ladder::before{
  content:"";position:absolute;left:4%;right:4%;top:11px;height:2px;
  background:linear-gradient(90deg,rgba(0,137,137,.55),rgba(0,137,137,.12));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform 1.2s .15s var(--ease);
}
.card.is-in .ladder::before{transform:scaleX(1)}
.ladder li{text-align:center;position:relative;padding-top:26px}
.ladder li::before{
  content:"";position:absolute;top:6px;left:50%;margin-left:-5px;
  width:10px;height:10px;border-radius:50%;
  background:#fff;border:2px solid var(--brand);
  transform:scale(0);
  transition:transform .5s var(--ease-spring);
  transition-delay:calc(var(--i) * 90ms + 200ms);
  z-index:1;
}
.card.is-in .ladder li::before{transform:scale(1)}
.ladder li:last-child::before{background:var(--brand);box-shadow:0 0 0 4px rgba(0,137,137,.12)}
.ladder b{display:block;font-family:var(--font-serif);font-size:1rem;color:var(--brand-ink);line-height:1.2}
.ladder span{display:block;font-size:.68rem;color:var(--aux);margin-top:2px}
.ladder__foot{
  display:flex;align-items:center;gap:6px;
  margin-top:18px;padding-top:14px;
  border-top:1px dashed var(--border);
  font-size:.75rem;color:var(--aux);
}
.ladder__foot .icon{color:var(--brand)}

.chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:16px}
.chips span{
  font-size:.72rem;padding:3px 9px;border-radius:7px;
  background:var(--fill);color:var(--body);
}
.chip-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.chip-dot{
  display:inline-flex;align-items:center;gap:5px;
  font-size:.74rem;color:var(--ink-2);
  background:var(--fill);border-radius:999px;padding:4px 10px 4px 8px;
}
.chip-dot .icon{width:13px;height:13px;color:var(--brand-ink)}

.mini-chart{
  display:flex;align-items:flex-end;gap:6px;
  height:74px;margin-top:18px;
}
.mini-chart span{
  flex:1;height:calc(var(--h) * .74);border-radius:4px 4px 2px 2px;
  background:linear-gradient(180deg,#4CBFAE,rgba(0,137,137,.22));
  transform:scaleY(0);transform-origin:50% 100%;
  transition:transform .8s var(--ease);
  transition-delay:calc(var(--i,0) * 60ms);
}
.card.is-in .mini-chart span{transform:scaleY(1)}
.mini-chart span:nth-child(1){transition-delay:.05s}
.mini-chart span:nth-child(2){transition-delay:.11s}
.mini-chart span:nth-child(3){transition-delay:.17s}
.mini-chart span:nth-child(4){transition-delay:.23s}
.mini-chart span:nth-child(5){transition-delay:.29s}
.mini-chart span:nth-child(6){transition-delay:.35s}
.mini-chart span:nth-child(7){transition-delay:.41s;background:linear-gradient(180deg,var(--brand),rgba(0,137,137,.3))}

.wave{display:flex;align-items:center;gap:4px;height:52px;margin-top:18px}
.wave i{
  flex:1;height:var(--h);border-radius:3px;
  background:linear-gradient(180deg,rgba(0,137,137,.7),rgba(0,137,137,.18));
  animation:wave-breathe 2.4s ease-in-out infinite;
}
.wave i:nth-child(2n){animation-delay:-.35s}
.wave i:nth-child(3n){animation-delay:-.7s}
.wave i:nth-child(4n){animation-delay:-1.05s}
@keyframes wave-breathe{
  0%,100%{transform:scaleY(.55)}
  50%{transform:scaleY(1)}
}

.sync{display:flex;align-items:center;gap:10px;flex:none}
.sync__node{
  width:44px;height:44px;border-radius:14px;display:grid;place-items:center;
  background:var(--fill);color:var(--ink-2);
}
.sync__node--brand{background:var(--brand);color:#fff;box-shadow:0 10px 20px -12px rgba(0,137,137,.8)}
.sync__node .icon{width:20px;height:20px}
.sync__line{width:40px;height:2px;background:var(--border);position:relative;overflow:hidden;border-radius:2px}
.sync__line i{
  position:absolute;inset:0;width:40%;
  background:var(--brand);border-radius:2px;
  animation:flow 2.4s linear infinite;
}
.sync__line:nth-of-type(2) i{animation-delay:1.2s}
@keyframes flow{
  0%{transform:translateX(-120%)}
  100%{transform:translateX(260%)}
}

/* ---------------- AI 陪练 ---------------- */
.ai{padding-top:clamp(40px,6vw,72px)}
.ai__inner{
  display:grid;grid-template-columns:1fr 1fr;
  gap:clamp(32px,5vw,72px);align-items:center;
}
.bullets{margin:26px 0 30px;display:flex;flex-direction:column;gap:14px}
.bullets li{
  position:relative;padding-left:22px;
  font-size:.9rem;color:var(--body);line-height:1.7;
}
.bullets b{color:var(--ink);font-weight:600;margin-right:6px}
.b__dot{
  position:absolute;left:2px;top:.62em;
  width:7px;height:7px;border-radius:50%;
  background:var(--brand-soft);border:2px solid var(--brand);
}
.link-more{
  display:inline-flex;align-items:center;gap:6px;
  font-size:.9rem;font-weight:600;color:var(--brand-ink);
  padding-bottom:3px;border-bottom:1px solid rgba(0,97,95,.25);
  transition:gap .3s var(--ease),color .25s;
}
.link-more:hover{gap:11px;color:var(--brand)}
.link-more .icon{width:15px;height:15px}

.ai__panel{position:relative}
.chat-panel{
  background:var(--card);
  border-radius:var(--r-lg);
  box-shadow:var(--shadow-hi);
  overflow:hidden;
  border:1px solid rgba(255,255,255,.9);
}
.chat-panel__head{
  display:flex;align-items:center;gap:12px;
  padding:16px 18px;
  border-bottom:1px solid var(--hair);
  background:linear-gradient(180deg,rgba(224,242,242,.5),rgba(252,251,248,0));
}
.chat-panel__head img{width:46px;height:46px;border-radius:14px;object-fit:cover;flex:none}
.chat-panel__head b{display:block;font-size:.94rem;font-weight:600}
.chat-panel__head span{display:block;font-size:.74rem;color:var(--aux)}
.live{
  margin-left:auto;display:inline-flex;align-items:center;gap:6px;
  font-size:.68rem;color:#0E7A5F;background:#E2F6EE;
  padding:4px 9px;border-radius:999px;flex:none;
}
.live i{width:5px;height:5px;border-radius:50%;background:#17B26A;animation:blink 1.8s ease-in-out infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.35}}

.chat-body{
  padding:20px 18px 8px;
  display:flex;flex-direction:column;gap:12px;
  min-height:318px;
}
.msg{display:flex;align-items:flex-end;gap:8px;max-width:88%}
.msg img{width:26px;height:26px;border-radius:50%;object-fit:cover;flex:none;margin-bottom:2px}
.msg p{
  background:var(--fill);
  border-radius:16px 16px 16px 5px;
  padding:9px 14px;
  font-size:.86rem;color:var(--ink-2);line-height:1.6;
}
.msg--me{align-self:flex-end}
.msg--me p{
  background:var(--brand);color:#fff;
  border-radius:16px 16px 5px 16px;
  box-shadow:0 8px 18px -12px rgba(0,137,137,.9);
}
.chat-body--anim .msg{opacity:0;transform:translateY(10px) scale(.98);transition:opacity .45s var(--ease),transform .45s var(--ease)}
.chat-body--anim .msg.is-in{opacity:1;transform:none}

.typing{
  display:flex;align-items:center;gap:4px;
  background:var(--fill);border-radius:16px 16px 16px 5px;
  padding:12px 14px;width:52px;
  opacity:0;transition:opacity .3s;
}
.typing.is-on{opacity:1}
.typing i{
  width:5px;height:5px;border-radius:50%;background:#93A0B0;
  animation:typing 1.2s ease-in-out infinite;
}
.typing i:nth-child(2){animation-delay:.15s}
.typing i:nth-child(3){animation-delay:.3s}
@keyframes typing{
  0%,60%,100%{transform:translateY(0);opacity:.5}
  30%{transform:translateY(-4px);opacity:1}
}

.chat-panel__foot{
  display:flex;align-items:center;justify-content:space-between;
  gap:14px;padding:14px 18px 18px;
  border-top:1px solid var(--hair);
}
.kw{display:flex;align-items:center;gap:6px;flex-wrap:wrap;font-size:.68rem}
.kw span{color:var(--aux);margin-right:2px}
.kw em{
  font-family:var(--font-serif);font-size:.82rem;
  background:var(--brand-soft);color:var(--brand-ink);
  padding:2px 9px;border-radius:999px;
}
.mic-btn{
  position:relative;width:46px;height:46px;border-radius:50%;
  background:var(--brand);color:#fff;display:grid;place-items:center;flex:none;
  box-shadow:0 12px 22px -12px rgba(0,137,137,.9);
}
.mic-btn .icon{width:20px;height:20px}
.mic-btn__pulse{
  position:absolute;inset:0;border-radius:50%;
  border:2px solid rgba(0,137,137,.5);
  animation:mic-pulse 2.6s ease-out infinite;
}
@keyframes mic-pulse{
  0%{transform:scale(1);opacity:.8}
  70%{transform:scale(1.5);opacity:0}
  100%{opacity:0}
}

.ai__badge{
  position:absolute;
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(252,251,248,.94);
  border:1px solid rgba(255,255,255,.9);
  box-shadow:0 16px 30px -20px rgba(47,90,68,.6);
  padding:8px 13px;border-radius:999px;
  font-size:.74rem;color:var(--ink-2);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
}
.ai__badge .icon{color:var(--brand);width:14px;height:14px}
.ai__badge--2{right:-18px;top:7%;animation:floaty 8.2s .5s ease-in-out infinite}

/* 角色走马灯 */
.marquee{
  margin-top:clamp(44px,6vw,76px);
  overflow:hidden;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 7%,#000 93%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 7%,#000 93%,transparent);
}
.marquee__track{
  display:flex;gap:14px;width:max-content;
  animation:marquee 56s linear infinite;
}
.marquee:hover .marquee__track{animation-play-state:paused}
@keyframes marquee{
  from{transform:translate3d(0,0,0)}
  to{transform:translate3d(-50%,0,0)}
}
.cast{
  position:relative;width:clamp(140px,16vw,192px);aspect-ratio:4/5;
  border-radius:18px;overflow:hidden;flex:none;
  background:var(--fill);
  box-shadow:0 16px 30px -22px rgba(47,90,68,.6);
}
.cast img{width:100%;height:100%;object-fit:cover;object-position:50% 18%;transition:transform .8s var(--ease)}
.cast:hover img{transform:scale(1.05)}
.cast figcaption{
  position:absolute;left:0;right:0;bottom:0;
  padding:26px 12px 11px;
  background:linear-gradient(180deg,rgba(10,26,24,0),rgba(10,26,24,.78));
  color:#fff;
}
.cast figcaption b{display:block;font-size:.84rem;font-weight:600}
.cast figcaption span{display:block;font-size:.68rem;opacity:.72}
.cast--more{
  display:grid;place-items:center;text-align:center;
  background:linear-gradient(150deg,#E0F2F2,#EDF7F2);
  border:1px dashed rgba(0,137,137,.3);
  box-shadow:none;
}
.cast--more b{display:block;font-family:var(--font-serif);font-size:1.5rem;color:var(--brand-ink)}
.cast--more span{display:block;font-size:.72rem;color:var(--aux);margin-top:4px}

/* ---------------- 学习闭环 ---------------- */
.loop{background:linear-gradient(180deg,rgba(252,251,248,0),rgba(252,251,248,.55) 22%,rgba(252,251,248,.55) 78%,rgba(252,251,248,0))}
.steps{
  display:grid;grid-template-columns:repeat(5,1fr);
  gap:clamp(12px,2vw,22px);
  position:relative;
}
.steps::before{
  content:"";position:absolute;top:26px;left:4%;right:4%;height:1px;
  background-image:linear-gradient(90deg,rgba(0,137,137,.4) 50%,transparent 0);
  background-size:12px 1px;
}
.step{position:relative;padding-top:60px}
.step__n{
  position:absolute;top:8px;left:0;
  width:38px;height:38px;border-radius:50%;
  display:grid;place-items:center;
  background:var(--card);border:1px solid var(--border);
  font-family:var(--font-serif);font-size:.82rem;color:var(--brand-ink);
  box-shadow:0 8px 18px -14px rgba(47,90,68,.6);
  transition:background .4s,color .4s,border-color .4s,transform .4s var(--ease);
}
.step:hover .step__n{
  background:var(--brand);color:#fff;border-color:var(--brand);transform:scale(1.06);
}
.step h3{font-size:1rem;font-weight:600;margin-bottom:8px}
.step p{font-size:.84rem;color:var(--body);line-height:1.72}

/* ---------------- 界面预览 ---------------- */
.screens{padding-top:clamp(52px,7vw,92px)}
.screens__row{
  display:flex;justify-content:center;align-items:flex-start;
  gap:clamp(16px,3vw,40px);
  padding-top:20px;
}
.shot{display:flex;flex-direction:column;align-items:center;gap:20px}
.shot--lift{transform:translateY(-34px)}
.phone--shot{width:clamp(220px,26vw,286px)}
.shot figcaption{
  font-size:.76rem;color:var(--aux);text-align:center;
  max-width:230px;line-height:1.6;
}
.shot figcaption::before{
  content:"";display:block;width:22px;height:1px;
  background:var(--border);margin:0 auto 12px;
}

/* 单词卡手机 */
.screen--word{padding-top:.3em}
.word-top{display:flex;align-items:center;justify-content:space-between;font-size:.76em}
.word-top__b{font-weight:600;color:var(--ink)}
.word-top__c{color:var(--aux);font-size:.92em}
.flip{perspective:900px;margin-top:.6em;flex:1;min-height:0}
.flip__inner{
  position:relative;width:100%;height:100%;
  transform-style:preserve-3d;
  transition:transform .9s cubic-bezier(.3,.1,.2,1);
}
.flip.is-flipped .flip__inner{transform:rotateY(180deg)}
.flip__face{
  position:absolute;inset:0;
  backface-visibility:hidden;-webkit-backface-visibility:hidden;
  background:var(--card);border-radius:1em;
  padding:1.15em 1em;
  box-shadow:0 .6em 1.6em -.9em rgba(59,97,81,.34), 0 0 0 1px rgba(47,90,68,.04);
  display:flex;flex-direction:column;
  overflow:hidden;
}
.flip__face--front::after{
  content:"";position:absolute;right:-18%;top:-18%;
  width:60%;aspect-ratio:1;border-radius:50%;
  background:radial-gradient(circle,rgba(0,137,137,.1),transparent 70%);
}
.flip__face--back{transform:rotateY(180deg);background:linear-gradient(160deg,#F4FBF8,#FCFBF8 55%);justify-content:center}
.w-meta{display:flex;align-items:center;gap:.5em}
.w-pos{font-size:.78em;color:var(--growth);font-weight:600;letter-spacing:.02em}
.w-tag{
  font-size:.6em;color:var(--brand-ink);background:var(--brand-soft);
  padding:.2em .55em;border-radius:999px;letter-spacing:.02em;
}
.w-word{
  font-family:var(--font-serif);
  font-size:2.15em;font-weight:500;line-height:1.15;
  letter-spacing:-.015em;margin-top:auto;padding-top:.6em;color:var(--ink);
  word-break:break-word;
}
.w-ipa{font-family:var(--font-serif);font-size:.82em;color:var(--aux);margin-top:.3em}
.w-def{font-size:.92em;color:var(--ink-2);margin-top:.75em;line-height:1.6}
.w-dash{
  height:1px;margin:auto 0 .75em;
  background-image:linear-gradient(90deg,rgba(47,90,68,.18) 50%,transparent 0);
  background-size:7px 1px;
}
.w-ex{
  font-size:.78em;color:var(--body);line-height:1.7;
}
.w-ex b{color:var(--brand-ink);font-weight:600}
.w-ex-zh{font-size:.72em;color:#8794A4;line-height:1.6;margin-top:.35em}
.w-actions{
  margin-top:0;display:flex;align-items:center;justify-content:space-between;
  gap:.5em;padding-top:1em;
}
.w-audio{
  display:inline-flex;align-items:center;gap:.35em;
  font-size:.72em;color:var(--brand-ink);font-weight:500;
  background:var(--brand-soft);
  padding:.38em .72em;border-radius:999px;
}
.w-star{
  display:inline-flex;align-items:center;gap:.3em;
  font-size:.68em;color:var(--aux);
}
.w-audio .icon{width:1.1em;height:1.1em}
.w-star .icon{width:1em;height:1em;color:var(--growth)}
.w-back-k{font-size:.72em;color:var(--aux);letter-spacing:.06em;margin-top:.9em}
.w-back-k:first-child{margin-top:0}
.w-back-t{font-size:.84em;color:var(--ink-2);line-height:1.68;margin-top:.3em}
.w-back-dash{
  height:1px;margin:.9em 0 .1em;
  background-image:linear-gradient(90deg,rgba(47,90,68,.22) 50%,transparent 0);
  background-size:7px 1px;
}
.w-back-ex{font-size:.8em;color:var(--ink-2);line-height:1.6;margin-top:.3em}
.w-back-ex span{display:block;color:var(--aux);font-size:.9em;margin-top:.15em}
.judge{display:flex;gap:.45em;margin-top:.85em}
.judge__b{
  flex:1;text-align:center;padding:.62em 0;border-radius:.7em;
  font-size:.76em;font-weight:600;
}
.judge__b--no{background:#FDECEC;color:#C0383D}
.judge__b--fuzzy{background:#FFF4E0;color:#9A6412}
.judge__b--yes{background:var(--brand);color:#fff;box-shadow:0 .5em 1em -.6em rgba(0,137,137,.9)}
.word-foot{text-align:center;font-size:.68em;color:var(--aux);margin-top:.6em}
.word-foot b{color:var(--brand-ink);font-weight:600}

/* 词书库手机 */
.books__head{display:flex;align-items:center;justify-content:space-between;padding-top:.4em}
.books__head h4{font-size:1.05em;font-weight:700}
.tabs-sm{display:flex;gap:.4em;margin-top:.5em}
.tabs-sm span{
  font-size:.7em;padding:.28em .7em;border-radius:999px;
  background:var(--fill);color:var(--aux);
}
.tabs-sm span.is-on{background:var(--brand);color:#fff;font-weight:500}
.book-item{
  display:flex;align-items:center;gap:.65em;
  background:var(--card);border-radius:.8em;padding:.6em .7em;
  box-shadow:0 .35em 1em -.8em rgba(59,97,81,.28), 0 0 0 1px rgba(47,90,68,.03);
  margin-top:.5em;
}
.book-item.is-on{box-shadow:0 0 0 1.5px rgba(0,137,137,.35), 0 .5em 1.2em -.8em rgba(59,97,81,.4)}
.bi__art{width:2.4em;height:2.4em;border-radius:.6em;overflow:hidden;flex:none;background:#EAF4EF}
.bi__art img{width:100%;height:100%;object-fit:cover}
.bi__art--gold{background:#FBF0DF}
.bi__art--ai{background:#EFEDFA}
.bi__art--mint{background:#E2F6EE}
.book-item b{display:block;font-size:.82em;font-weight:600;line-height:1.35}
.book-item span{display:block;font-size:.68em;color:var(--aux)}
.bi__go{width:1.1em;height:1.1em;color:#A9B3C0;margin-left:auto;transform:rotate(-90deg)}
.books__note{
  margin-top:auto;text-align:center;font-size:.66em;color:var(--aux);
  padding-top:.8em;
}

/* 学习画像手机 */
.growth__head{display:flex;align-items:center;justify-content:space-between;padding-top:.4em}
.growth__head h4{font-size:1.05em;font-weight:700}
.streak{display:flex;align-items:center;justify-content:space-between;margin-top:.5em}
.streak .k{font-size:.76em;color:var(--aux)}
.streak__v{font-size:1.6em;font-weight:700;line-height:1.2;color:var(--brand-ink)}
.streak__v small{font-size:.42em;font-weight:500;color:var(--aux);margin-left:.15em}
.streak__flame{
  width:2.6em;height:2.6em;border-radius:50%;
  background:#FBF0DF;color:var(--growth);display:grid;place-items:center;
}
.streak__flame .icon{width:1.4em;height:1.4em}
.chartcard{margin-top:.5em;padding-bottom:.6em}
.chartcard .k{font-size:.72em;color:var(--aux)}
.bars{display:flex;align-items:flex-end;gap:.35em;height:4.4em;margin-top:.6em}
.bars > span{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;
  height:100%;gap:.3em;
}
.bars i{
  display:block;width:100%;height:var(--h);border-radius:.3em .3em .15em .15em;
  background:linear-gradient(180deg,#7FCFC0,rgba(0,137,137,.2));
  transform:scaleY(0);transform-origin:50% 100%;
  transition:transform .9s var(--ease);
}
.screen--growth .bars > span:nth-child(1) i{transition-delay:.05s}
.screen--growth .bars > span:nth-child(2) i{transition-delay:.11s}
.screen--growth .bars > span:nth-child(3) i{transition-delay:.17s}
.screen--growth .bars > span:nth-child(4) i{transition-delay:.23s}
.screen--growth .bars > span:nth-child(5) i{transition-delay:.29s}
.screen--growth .bars > span:nth-child(6) i{transition-delay:.35s}
.screen--growth .bars > span:nth-child(7) i{transition-delay:.41s}
.screen--growth.is-in .bars i{transform:scaleY(1)}
.bars .is-peak i{background:linear-gradient(180deg,var(--brand),rgba(0,137,137,.3))}
.bars em{font-size:.56em;color:var(--aux);font-style:normal}
.mini-stats{display:grid;grid-template-columns:1fr 1fr;gap:.5em;margin-top:.5em}
.mini-stats div{background:var(--card);border-radius:.7em;padding:.55em .7em;box-shadow:0 .3em .8em -.7em rgba(59,97,81,.3), 0 0 0 1px rgba(47,90,68,.03)}
.mini-stats b{display:block;font-size:1em;font-weight:700;color:var(--ink)}
.mini-stats span{font-size:.66em;color:var(--aux)}
.pace{
  display:flex;justify-content:space-between;
  margin-top:.5em;padding:.5em .7em;
  border-radius:.7em;background:rgba(224,242,242,.55);
}
.pace span{font-size:.62em;color:var(--aux);display:flex;flex-direction:column;align-items:center;gap:.1em}
.pace b{font-size:1.15em;color:var(--brand-ink);font-weight:700}
.medals{display:flex;gap:.5em;margin-top:.5em}
.medal{
  flex:1;display:flex;flex-direction:column;align-items:center;gap:.25em;
  background:var(--card);border-radius:.7em;padding:.5em 0;
  box-shadow:0 .3em .8em -.7em rgba(59,97,81,.3), 0 0 0 1px rgba(47,90,68,.03);
}
.medal img{width:1.9em;height:1.9em;border-radius:30%}
.medal em{font-size:.6em;color:var(--aux);font-style:normal}
.goal{margin-top:.5em;background:var(--card);border-radius:.7em;padding:.6em .7em;box-shadow:0 .3em .8em -.7em rgba(59,97,81,.3), 0 0 0 1px rgba(47,90,68,.03)}
.goal__row{display:flex;justify-content:space-between;font-size:.66em;color:var(--aux)}
.goal__row b{color:var(--brand-ink);font-weight:600}
.goal .bar{margin-top:.35em;height:.32em}
.growth__foot{text-align:center;font-size:.68em;color:var(--aux);margin-top:auto;padding-top:.6em}
.growth__foot b{color:var(--brand-ink)}

/* ---------------- 下载 ---------------- */
.download{padding-bottom:clamp(48px,7vw,88px)}
.download__panel{
  position:relative;
  overflow:hidden;
  border-radius:clamp(24px,3vw,36px);
  background:
    radial-gradient(120% 90% at 88% 8%,rgba(89,191,175,.35),transparent 60%),
    radial-gradient(90% 80% at 6% 96%,rgba(196,124,39,.18),transparent 62%),
    linear-gradient(150deg,#00615F 0%,#004C4B 58%,#063A3E 100%);
  padding:clamp(30px,5vw,64px);
  display:grid;grid-template-columns:1.15fr .85fr;
  gap:clamp(28px,4vw,56px);align-items:center;
  color:#fff;
  box-shadow:0 40px 80px -48px rgba(0,76,75,.9);
}
.download__panel::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='2'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)' opacity='.25'/%3E%3C/svg%3E");
  opacity:.18;mix-blend-mode:overlay;
}
.download__copy h2{
  font-size:clamp(1.8rem,3.2vw,2.65rem);
  line-height:1.24;font-weight:700;letter-spacing:-.02em;
  margin-bottom:14px;
}
.download__lede{color:rgba(255,255,255,.76);font-size:.95rem;max-width:30em;margin-bottom:28px}
.store-row--dark{gap:12px}
.store-btn--glass{
  background:rgba(255,255,255,.1);
  border:1px solid rgba(255,255,255,.24);
  color:#fff;
  box-shadow:none;
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
}
.store-btn--glass:hover{background:rgba(255,255,255,.17);box-shadow:0 18px 30px -22px rgba(0,0,0,.8)}
.store-btn--glass .store-btn__badge{background:rgba(255,255,255,.16)}
.download__fine{font-size:.74rem;color:rgba(255,255,255,.62);margin-top:18px;letter-spacing:.02em}

.download__aside{position:relative;display:flex;justify-content:center;align-items:center}
.ticket{
  width:min(360px,100%);
  background:linear-gradient(160deg,#FCFBF8,#F4F1E9);
  color:var(--ink);
  border-radius:18px;
  padding:24px 24px 18px;
  transform:rotate(-3.2deg);
  box-shadow:0 30px 60px -30px rgba(0,0,0,.55);
  position:relative;
  animation:floaty 9s ease-in-out infinite;
}
.ticket::before{
  content:"";position:absolute;left:0;right:0;top:52px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(47,90,68,.12),transparent);
}
.ticket__top{display:flex;justify-content:space-between;font-size:.62rem;letter-spacing:.16em;color:var(--aux);text-transform:uppercase}
.ticket__no{font-family:var(--font-serif);letter-spacing:.1em}
.ticket__word{
  font-family:var(--font-serif);font-size:2rem;font-weight:500;
  letter-spacing:-.02em;margin-top:26px;line-height:1.2;
}
.ticket__ipa{font-family:var(--font-serif);font-size:.82rem;color:var(--aux);margin-top:2px}
.ticket__def{font-size:.84rem;color:var(--ink-2);margin-top:14px}
.ticket__def b{color:var(--brand);margin-right:4px}
.ticket__ex{font-size:.76rem;color:var(--body);margin-top:6px;line-height:1.65}
.ticket__dash{
  height:1px;margin:18px 0 12px;
  background-image:linear-gradient(90deg,rgba(47,90,68,.28) 50%,transparent 0);
  background-size:8px 1px;
}
.ticket__foot{display:flex;align-items:center;justify-content:space-between;font-size:.66rem;color:var(--aux)}
.ticket__stamp{
  font-family:var(--font-serif);font-size:.68rem;letter-spacing:.1em;
  color:#B4573F;border:1.5px solid rgba(180,87,63,.5);
  padding:2px 8px;border-radius:4px;transform:rotate(6deg);
}
.download__icon{
  position:absolute;right:-6px;bottom:-16px;width:72px;height:72px;border-radius:18px;
  box-shadow:0 20px 34px -18px rgba(0,0,0,.7);
  transform:rotate(6deg);
  animation:floaty 8s .4s ease-in-out infinite;
}

/* ---------------- FAQ ---------------- */
.faq__inner{display:grid;grid-template-columns:.82fr 1.18fr;gap:clamp(28px,5vw,72px);align-items:start}
.faq__head{position:sticky;top:110px}
.faq__head .sec-lede{margin-top:10px}
.faq__list{display:flex;flex-direction:column}
.qa{border-bottom:1px solid var(--border)}
.qa:first-child{border-top:1px solid var(--border)}
.qa__q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:20px 2px;text-align:left;
  font-size:.98rem;font-weight:500;color:var(--ink-2);
  transition:color .25s;
}
.qa__q:hover{color:var(--brand-ink)}
.qa__i{
  width:18px;height:18px;color:var(--aux);flex:none;
  transition:transform .4s var(--ease),color .3s;
}
.qa.is-open .qa__q{color:var(--brand-ink)}
.qa.is-open .qa__i{transform:rotate(180deg);color:var(--brand)}
.qa__a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .42s var(--ease)}
.qa__a > p{
  overflow:hidden;margin:0;
  font-size:.88rem;color:var(--body);line-height:1.8;
  opacity:0;transition:opacity .35s var(--ease),padding .4s var(--ease);
  padding:0 2px 0;
}
.qa.is-open .qa__a{grid-template-rows:1fr}
.qa.is-open .qa__a > p{opacity:1;padding:0 2px 22px}

/* ---------------- Footer ---------------- */
.footer{
  border-top:1px solid var(--border);
  background:linear-gradient(180deg,rgba(240,238,232,0),rgba(240,238,232,.8));
  padding-top:clamp(40px,6vw,64px);
}
.footer__inner{
  display:grid;grid-template-columns:1.2fr 1.4fr;gap:clamp(28px,5vw,64px);
  padding-bottom:clamp(32px,5vw,52px);
}
.brand--footer{margin-bottom:16px}
.footer__brand p{font-size:.84rem;color:var(--aux);line-height:1.8}
.footer__contact{display:flex;flex-direction:column;gap:8px;margin-top:16px}
.footer__contact a{
  display:flex;align-items:center;gap:8px;
  font-size:.84rem;color:var(--aux);transition:color .2s;
}
.footer__contact a:hover{color:var(--brand-ink)}
.footer__contact .icon{width:15px;height:15px;color:var(--brand);flex:none}
.footer__stores{display:flex;gap:8px;margin-top:18px}
.footer__stores a{
  width:38px;height:38px;border-radius:11px;
  display:grid;place-items:center;
  background:rgba(252,251,248,.9);border:1px solid var(--border);
  color:var(--ink-2);transition:background .25s,color .25s,transform .25s;
}
.footer__stores a:hover{background:var(--brand);color:#fff;border-color:var(--brand);transform:translateY(-2px)}
.footer__stores .icon{width:18px;height:18px}
.footer__cols{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.footer__cols > div{display:flex;flex-direction:column;gap:9px}
.footer__cols b{font-size:.78rem;letter-spacing:.08em;color:var(--ink);margin-bottom:4px}
.footer__cols a{font-size:.84rem;color:var(--aux);transition:color .2s}
.footer__cols a:hover{color:var(--brand-ink)}
.footer__bottom{
  display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between;
  padding-top:20px;padding-bottom:28px;
  border-top:1px solid var(--hair);
  font-size:.74rem;color:var(--aux);
}
.footer__note{opacity:.8}

/* 回到顶部 */
.to-top{
  position:fixed;right:clamp(16px,3vw,28px);bottom:clamp(16px,3vw,28px);
  width:46px;height:46px;border-radius:50%;
  background:rgba(252,251,248,.94);
  border:1px solid var(--border);
  box-shadow:0 14px 28px -16px rgba(47,90,68,.7);
  display:grid;place-items:center;color:var(--ink-2);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .35s,transform .35s,visibility .35s,background .25s,color .25s;
  z-index:70;
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
}
.to-top.is-on{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--brand);color:#fff;border-color:var(--brand)}
.to-top .icon{transform:rotate(180deg);width:18px;height:18px}

/* ---------------- 弹窗 ---------------- */
.modal{
  position:fixed;inset:0;z-index:120;
  display:grid;place-items:center;
  padding:24px;
}
.modal[hidden]{display:none}
.modal__scrim{
  position:absolute;inset:0;
  background:rgba(12,34,32,.42);
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
  animation:fade .3s var(--ease);
}
.modal__box{
  position:relative;
  width:min(420px,100%);
  background:var(--card);
  border-radius:24px;
  padding:32px 30px 26px;
  box-shadow:0 40px 80px -30px rgba(10,40,36,.6);
  animation:pop .42s var(--ease-spring);
  text-align:center;
}
@keyframes fade{from{opacity:0}to{opacity:1}}
@keyframes pop{from{opacity:0;transform:translateY(14px) scale(.96)}to{opacity:1;transform:none}}
.modal__x{
  position:absolute;right:14px;top:14px;
  width:34px;height:34px;border-radius:50%;
  display:grid;place-items:center;color:var(--aux);
  transition:background .2s,color .2s;
}
.modal__x:hover{background:var(--fill);color:var(--ink)}
.modal__x .icon{width:16px;height:16px}
.modal__ico{
  display:grid;place-items:center;
  width:54px;height:54px;border-radius:16px;margin:4px auto 18px;
  background:var(--brand-soft);color:var(--brand-ink);
}
.modal__ico .icon{width:24px;height:24px}
.modal__box h4{font-size:1.15rem;font-weight:600;margin-bottom:10px}
.modal__box p{font-size:.88rem;color:var(--body);line-height:1.75}
.modal__actions{margin-top:24px;display:flex;justify-content:center}

/* ---------------- 揭示动画 ---------------- */
.js .reveal{
  opacity:0;transform:translateY(24px);
  transition:opacity .8s var(--ease),transform .8s var(--ease);
  transition-delay:var(--d,0ms);
}
.js .reveal.is-in{opacity:1;transform:none}
.js .shot.reveal{transform:translateY(34px) scale(.985)}
.js .shot.reveal.is-in{transform:none}
.js .shot--lift.reveal{transform:translateY(0) scale(.985)}
.js .shot--lift.reveal.is-in{transform:translateY(-34px)}

/* ---------------- 响应式 ---------------- */
@media (max-width:1180px){
  .float--review{display:none}
}

@media (max-width:1120px){
  .hero__inner{grid-template-columns:1fr .92fr;gap:24px}
  .float--stat{right:-6%}
  .ai__badge--2{right:-6px}
}

@media (max-width:980px){
  .hero{padding-top:104px;min-height:auto}
  .hero__inner{grid-template-columns:1fr;justify-items:start;gap:36px}
  .hero__copy{max-width:640px}
  .hero__visual{width:100%;min-height:480px;margin-top:8px}
  .phone--hero{width:clamp(240px,42vw,290px)}
  .float--review{display:flex;left:2%;top:12%}
  .float--stat{right:2%;top:2%}
  .art-float--globe{right:6%;bottom:0}
  .art-float--seed{left:8%;top:0}

  .bento{grid-template-columns:repeat(2,1fr)}
  .card--wide{grid-column:span 2}
  .card--sync{grid-column:span 2;flex-direction:column;align-items:flex-start;gap:18px}
  .ai__inner{grid-template-columns:1fr;gap:36px}
  .ai__copy{max-width:620px}
  .ai__panel{max-width:560px;width:100%}
  .ai__badge{display:none}
  .steps{grid-template-columns:repeat(2,1fr);gap:28px 20px}
  .steps::before{display:none}
  .step{padding-top:52px}
  .screens__row{flex-wrap:wrap}
  .shot--lift{transform:none}
  .js .shot--lift.reveal.is-in{transform:none}
  .download__panel{grid-template-columns:1fr;gap:36px}
  .download__aside{justify-content:flex-start}
  .download__icon{right:auto;left:min(300px,86%)}
  .faq__inner{grid-template-columns:1fr;gap:28px}
  .faq__head{position:static}
  .footer__inner{grid-template-columns:1fr;gap:36px}
}

@media (max-width:860px){
  .nav__links{display:none}
  .nav__toggle{display:flex}
  .nav__download{display:none}
  .stats__grid{grid-template-columns:repeat(2,1fr)}
  .stat:nth-child(2){border-right:0}
  .stat:nth-child(1),.stat:nth-child(2){border-bottom:1px solid var(--hair)}
}

@media (max-width:720px){
  .hero{padding-top:96px}
  .hero__title{font-size:clamp(2.35rem,9vw,3.1rem)}
  .hero__lede{font-size:.98rem}
  .store-row{flex-direction:column;align-items:stretch}
  .store-btn{width:100%;justify-content:flex-start}
  .hero__meta{gap:6px 16px;font-size:.78rem}
  .hero__visual{min-height:430px}
  .phone--hero{width:min(74vw,272px)}
  .float{display:none}
  .art-float--seed{display:none}
  .art-float--globe{width:48px;right:2%;bottom:0}

  .section{padding:clamp(52px,12vw,72px) 0}
  .sec-title-lg{font-size:clamp(1.65rem,7vw,2.1rem)}
  .bento{grid-template-columns:1fr}
  .card--wide,.card--sync{grid-column:span 1}
  .ladder{grid-template-columns:repeat(4,1fr);gap:14px 0;row-gap:18px}
  .ladder::before{display:none}
  .ladder li{padding-top:22px}
  .card__head{flex-direction:column;gap:12px}

  .chat-body{min-height:262px;padding:16px 14px 6px}
  .msg{max-width:94%}
  .msg p{font-size:.84rem}
  .ai__badge{display:none}
  .marquee__track{animation-duration:38s}

  .steps{grid-template-columns:1fr;gap:22px}
  .step{padding-top:48px}
  .step__n{top:0}

  .screens__row{
    flex-wrap:nowrap;
    justify-content:flex-start;
    overflow-x:auto;
    scroll-snap-type:x mandatory;
    padding:12px 0 20px;
    gap:18px;
    -webkit-overflow-scrolling:touch;
    scrollbar-width:none;
  }
  .screens__row::-webkit-scrollbar{display:none}
  .shot{scroll-snap-align:center;min-width:min(78vw,300px)}
  .shot--lift{transform:none}
  .phone--shot{width:min(74vw,282px)}

  .download__panel{padding:26px 22px 30px}
  .download__aside{display:none}
  .store-row--dark{flex-direction:column}

  .footer__cols{grid-template-columns:repeat(2,1fr);gap:22px}
  .footer__bottom{flex-direction:column;gap:6px}

  .to-top{width:42px;height:42px}
}

@media (max-width:420px){
  .hero__visual{min-height:400px}
  .float--stat{display:none}
  .float--review{top:0}
}

/* ---------------- 无障碍 / 降低动效 ---------------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .js .reveal{opacity:1;transform:none}
  .mark__line path{stroke-dashoffset:0}
  .flip__inner{transition:none}
  .marquee__track{animation:none}
}