/* ============================================================
   AI 赋能美育 · 项目实践路径
   静态站点样式表 — 天空 / 纸感 / 手绘贴纸
   ============================================================ */

@font-face{
  font-family:"KuaiLe";
  src:url("../fonts/display.woff2") format("woff2");
  font-weight:400; font-style:normal; font-display:swap;
}
@font-face{
  font-family:"SongWarm";
  src:url("../fonts/body.woff2") format("woff2");
  font-weight:400; font-style:normal; font-display:swap;
}
@font-face{
  font-family:"SongWarm";
  src:url("../fonts/body-600.woff2") format("woff2");
  font-weight:600; font-style:normal; font-display:swap;
}

:root{
  /* 天空 */
  --sky-1:#EAF8FF;
  --sky-2:#BFE6FB;
  --sky-3:#8FD5F6;
  --sky-4:#56B7EC;
  --sky-5:#2D8FCB;
  --sky-6:#17618F;
  /* 纸与地面 */
  --paper:#FCF2DE;
  --paper-2:#FFFCF2;
  --mint:#E6F6EC;
  --grass:#7CC94B;
  --grass-2:#4C9B33;
  /* 点缀 */
  --pink:#FF8FB6;
  --pink-2:#C93A6E;
  --sun:#FFC93F;
  --coral:#FF8E5E;
  --grape:#7B63D6;
  /* 文字 */
  --ink:#17334A;
  --ink-2:#3A5F7C;
  --ink-3:#52768E;
  --dusk:#0F3B57;
  --line:rgba(23,51,74,.14);

  --font-d:"KuaiLe","Yuanti SC","PingFang SC",system-ui,sans-serif;
  --font-b:"SongWarm","Songti SC","Noto Serif SC",Georgia,serif;

  --r-s:12px;
  --r-m:18px;
  --r-l:26px;
  --r-xl:34px;

  --shadow-s:0 1px 0 rgba(23,51,74,.05), 0 8px 18px -12px rgba(15,59,87,.35);
  --shadow-m:0 3px 0 rgba(23,51,74,.06), 0 18px 34px -20px rgba(15,59,87,.45);
  --shadow-l:0 6px 0 rgba(23,51,74,.05), 0 42px 70px -34px rgba(15,59,87,.5);

  --ease:cubic-bezier(.22,1,.36,1);
  --gap:clamp(16px,2.1vw,30px);
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:96px;
}

body{
  margin:0;
  font-family:var(--font-b);
  font-size:clamp(16px,1.02vw,17.5px);
  line-height:1.78;
  color:var(--ink);
  background:var(--paper);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img,picture,svg{max-width:100%;}
img{height:auto;}
h1,h2,h3,h4{font-family:var(--font-d);font-weight:400;line-height:1.3;margin:0;letter-spacing:.01em;}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
a{color:inherit;text-decoration:none;}
button{font:inherit;}

:focus-visible{
  outline:3px solid var(--sky-5);
  outline-offset:3px;
  border-radius:8px;
}

.sprite{position:absolute;width:0;height:0;overflow:hidden;}

.skip{
  position:fixed;left:16px;top:-100px;z-index:200;
  background:var(--dusk);color:var(--paper-2);
  padding:12px 18px;border-radius:0 0 12px 12px;
  transition:top .2s;
}
.skip:focus{top:0;}

.progress{
  position:fixed;inset:0 0 auto 0;height:3px;z-index:120;
  background:rgba(23,51,74,.06);
  pointer-events:none;
}
.progress i{
  display:block;height:100%;width:var(--p,0%);
  background:linear-gradient(90deg,var(--pink),var(--sun) 45%,var(--grass) 100%);
  border-radius:0 3px 3px 0;
  transition:width .12s linear;
}

.wrap{
  width:min(1200px,92vw);
  margin-inline:auto;
}

/* ---------- 通用文字件 ---------- */

.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-d);
  font-size:clamp(13px,1.1vw,15px);
  letter-spacing:.08em;
  color:var(--sky-6);
  background:rgba(255,255,255,.72);
  border:1.5px dashed rgba(23,97,143,.35);
  border-radius:999px;
  padding:7px 16px 7px 12px;
}
.eyebrow svg{
  width:16px;height:16px;flex:none;
  fill:none;stroke:var(--coral);stroke-width:1.7;
  stroke-linecap:round;stroke-linejoin:round;
}

.sec-title{
  font-size:clamp(28px,4.3vw,50px);
  line-height:1.26;
  margin-top:18px;
  text-wrap:balance;
}
.sec-title em{
  position:relative;isolation:isolate;
  font-style:normal;color:var(--pink-2);
  padding:0 .03em;
}
.sec-title em::after{
  content:"";position:absolute;z-index:-1;
  left:-.08em;right:-.08em;bottom:.10em;height:.30em;
  background:linear-gradient(90deg,rgba(255,201,63,.72),rgba(255,214,110,.58));
  border-radius:.24em .1em .26em .12em;
  transform:rotate(-.7deg);
}

.lead{
  margin-top:20px;
  font-size:clamp(16px,1.18vw,19px);
  line-height:1.92;
  color:var(--ink-2);
  max-width:62ch;
}

.sec-head{max-width:760px;}
.sec-head--center{margin-inline:auto;text-align:center;}
.sec-head--center .lead{margin-inline:auto;}

/* ---------- 导航 ---------- */

.nav{
  position:fixed;
  top:calc(10px + env(safe-area-inset-top));
  left:50%;translate:-50% 0;
  z-index:100;
  width:min(1240px,94vw);
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;
  padding:8px 10px 8px 12px;
  border-radius:999px;
  background:rgba(255,251,240,.72);
  border:1.5px solid rgba(255,255,255,.9);
  box-shadow:0 14px 30px -22px rgba(15,59,87,.6);
  backdrop-filter:blur(14px) saturate(1.3);
  -webkit-backdrop-filter:blur(14px) saturate(1.3);
  transition:background .35s ease, box-shadow .35s ease, padding .35s ease;
}
.nav.is-stuck{
  background:rgba(255,251,240,.92);
  box-shadow:0 10px 26px -18px rgba(15,59,87,.75);
}
.nav__brand{display:flex;align-items:center;gap:10px;padding:4px 6px;min-height:44px;}
.nav__mark{
  width:34px;height:34px;flex:none;display:grid;place-items:center;
  border-radius:12px;
  background:linear-gradient(150deg,var(--sky-3),var(--sky-5));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.7), 0 6px 12px -6px rgba(23,97,143,.9);
}
.nav__mark svg{width:20px;height:20px;fill:none;stroke:#FFFDF6;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
.nav__text{display:flex;flex-direction:column;line-height:1.16;}
.nav__text b{font-family:var(--font-d);font-size:16px;letter-spacing:.02em;}
.nav__text i{font-style:normal;font-size:12px;letter-spacing:.12em;color:var(--ink-2);}

.nav__links{
  display:flex;align-items:center;gap:2px;
  overflow:auto;
  scrollbar-width:none;
  -webkit-overflow-scrolling:touch;
}
.nav__links::-webkit-scrollbar{display:none;}
.nav__links a{
  display:inline-flex;align-items:center;
  min-height:44px;padding:0 14px;
  border-radius:999px;
  font-size:14px;letter-spacing:.04em;
  color:var(--ink-2);
  white-space:nowrap;
  transition:background .25s var(--ease), color .25s var(--ease), transform .25s var(--ease);
}
.nav__links a:hover{background:rgba(143,213,246,.28);color:var(--sky-6);transform:translateY(-1px);}

/* ---------- 首屏 ---------- */

.hero{
  position:relative;
  min-height:100vh;
  min-height:100svh;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  padding:calc(84px + env(safe-area-inset-top)) clamp(14px,3vw,34px) clamp(96px,13vh,170px);
  isolation:isolate;
  overflow:hidden;
  background:
    radial-gradient(90% 60% at 50% -6%, #F7FDFF 0%, rgba(247,253,255,0) 58%),
    linear-gradient(180deg,#D6F0FD 0%,#BFE6FB 26%,#A7DBF8 52%,#CDEDFD 72%,#F7EFDC 92%,var(--paper) 99%);
}

.hero__bg{position:absolute;inset:0;z-index:-1;overflow:hidden;}
.blob{
  position:absolute;border-radius:50%;
  filter:blur(60px);
  opacity:.62;
  will-change:transform;
}
.blob--a{
  width:44vw;height:44vw;left:-12vw;top:6vh;
  background:radial-gradient(circle at 40% 40%, #FFC7DD, rgba(255,199,221,0) 68%);
  animation:blobFloat 26s ease-in-out infinite;
}
.blob--b{
  width:50vw;height:50vw;right:-16vw;top:-6vh;
  background:radial-gradient(circle at 50% 50%, #9BD8FF, rgba(155,216,255,0) 70%);
  animation:blobFloat 32s ease-in-out infinite reverse;
}
.blob--c{
  width:56vw;height:38vw;left:18vw;bottom:-16vw;
  background:radial-gradient(circle at 50% 50%, #FFF0BE, rgba(255,240,190,0) 68%);
  animation:blobFloat 38s ease-in-out infinite;
}

.cloud{
  position:absolute;
  color:#fff;
  opacity:.72;
  filter:blur(1.4px);
  will-change:transform;
}
.cloud svg{width:100%;height:auto;display:block;}
.cloud--1{width:clamp(150px,17vw,280px);top:16%;left:-22%;animation:drift 96s linear infinite;opacity:.55;}
.cloud--2{width:clamp(190px,22vw,360px);top:7%;left:-30%;animation:drift 132s linear infinite 6s;opacity:.42;}
.cloud--3{width:clamp(120px,13vw,220px);bottom:24%;left:-24%;animation:drift 118s linear infinite 22s;opacity:.34;}

.petals{position:absolute;inset:0;pointer-events:none;}
.petal{
  position:absolute;top:-6vh;
  width:var(--s,12px);height:var(--s,12px);
  border-radius:58% 6% 58% 6%;
  background:linear-gradient(140deg,#FFE2EE 0%,#FFA9C9 60%,#FF86B4 100%);
  opacity:.85;
  animation:fall var(--dur,18s) linear var(--delay,0s) infinite;
  will-change:transform;
}
.petal--pale{background:linear-gradient(140deg,#FFFDF6,#FFD9E6 70%,#FFC2D8);opacity:.7;}

.hero__body{
  position:relative;
  width:100%;
  display:flex;flex-direction:column;align-items:center;
  gap:clamp(14px,2.2vh,28px);
}

.hero__intro{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);
  white-space:nowrap;border:0;
}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-d);font-size:13px;letter-spacing:.06em;
  color:var(--sky-6);
  background:rgba(255,253,246,.9);
  border-radius:999px;padding:7px 15px;
  box-shadow:0 6px 14px -10px rgba(15,59,87,.8);
}
.chip__dot{
  width:7px;height:7px;border-radius:50%;
  background:var(--coral);
  box-shadow:0 0 0 3px rgba(255,142,94,.22);
}

.poster{
  position:relative;
  margin:0;
  width:min(1700px,92vw);
  width:min(1700px,92vw,138dvh);
  padding:clamp(5px,.6vw,9px);
  border-radius:var(--r-l);
  background:linear-gradient(160deg,#FFFDF6,#FFF4DF);
  box-shadow:
    0 2px 0 rgba(255,255,255,.9) inset,
    0 0 0 1px rgba(255,255,255,.85),
    var(--shadow-l);
  animation:posterFloat 9s ease-in-out infinite;
}
.poster picture{display:block;}
.poster img{
  display:block;width:100%;height:auto;
  border-radius:calc(var(--r-l) - 7px);
  background:var(--sky-2);
}
.poster__glow{
  position:absolute;inset:8% 4% -12%;
  z-index:-1;border-radius:50%;
  background:radial-gradient(ellipse at 50% 50%, rgba(255,255,255,.85), rgba(173,226,255,.35) 45%, rgba(173,226,255,0) 72%);
  filter:blur(28px);
}

.hero__foot{
  display:flex;flex-direction:column;align-items:center;gap:14px;
  text-align:center;
  width:min(1100px,92vw);
}
.hero__tagline{
  font-family:var(--font-d);
  font-size:clamp(21px,2.9vw,34px);
  color:var(--ink);
  letter-spacing:.02em;
}
.hero__tagline b{
  font-weight:400;
  color:var(--sky-6);
  background-image:linear-gradient(transparent 64%, #FFE07A 64%, #FFE07A 92%, transparent 92%);
}
.hero__dot{color:var(--pink-2);}

.hero__chips{
  display:flex;flex-wrap:wrap;justify-content:center;gap:8px;
}
.hero__chips li{
  font-size:13px;letter-spacing:.1em;
  color:var(--ink-2);
  padding:6px 14px;
  border-radius:999px;
  background:rgba(255,253,246,.66);
  border:1px solid rgba(255,255,255,.9);
  box-shadow:0 4px 12px -10px rgba(15,59,87,.9);
}

.cue{
  display:inline-flex;align-items:center;gap:10px;
  font-size:13px;letter-spacing:.14em;color:var(--ink-3);
  padding:8px;
  min-height:44px;
}
.cue__ring{
  width:36px;height:36px;display:grid;place-items:center;
  border-radius:50%;
  border:1.5px dashed rgba(23,97,143,.45);
  animation:cueBounce 2.6s ease-in-out infinite;
}
.cue__ring svg{width:18px;height:18px;fill:none;stroke:var(--sky-6);stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;}

/* 波浪分隔 */
.wave{
  position:absolute;left:0;right:0;bottom:-1px;
  line-height:0;pointer-events:none;
}
.wave svg{width:100%;height:clamp(46px,6.2vw,96px);display:block;}
.wave--hero{z-index:2;}
.wave--hero svg{height:clamp(84px,12vh,150px);}
.wave--hero .h1{fill:#D2E9B9;}
.wave--hero .h2{fill:#E9F4D3;}
.wave--hero .h3{fill:var(--paper);}

/* ---------- 章节通用 ---------- */

.section{
  position:relative;
  padding:clamp(60px,7.6vw,116px) 0;
}

/* ---------- 理念 ---------- */

.section--idea{
  background:
    radial-gradient(80% 60% at 86% 4%, rgba(255,214,110,.42), rgba(255,214,110,0) 62%),
    radial-gradient(60% 40% at 8% 92%, rgba(255,183,209,.28), rgba(255,183,209,0) 70%),
    var(--paper);
}
.section--idea::before{
  content:"";
  position:absolute;left:-60px;top:14%;
  width:220px;height:220px;border-radius:50%;
  border:2px dashed rgba(255,143,182,.35);
  pointer-events:none;
}

.shifts{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:var(--gap);
  margin-top:clamp(36px,4.4vw,60px);
  counter-reset:s;
}
.shift{
  position:relative;
  padding:clamp(22px,2.4vw,30px) clamp(20px,2.2vw,28px) clamp(24px,2.6vw,32px);
  background:linear-gradient(165deg,var(--paper-2),#FFF6E6);
  border-radius:var(--r-l);
  border:1.5px solid rgba(255,255,255,.9);
  box-shadow:var(--shadow-s);
  overflow:hidden;
  transition:transform .45s var(--ease), box-shadow .45s var(--ease);
}
.shift::after{
  content:"";
  position:absolute;right:-26px;bottom:-26px;
  width:96px;height:96px;border-radius:50%;
  background:radial-gradient(circle at 35% 35%, rgba(143,213,246,.5), rgba(143,213,246,0) 70%);
}
.shift:hover{transform:translateY(-6px) rotate(-.5deg);box-shadow:var(--shadow-m);}
.shift__no{
  display:block;
  font-family:var(--font-d);
  font-size:clamp(44px,4.6vw,64px);
  line-height:1;
  color:transparent;
  -webkit-text-stroke:1.4px rgba(23,97,143,.22);
  letter-spacing:.02em;
  opacity:.9;
}
.shift h3{
  font-size:clamp(19px,1.8vw,23px);
  margin-top:6px;
  color:var(--ink);
}
.shift p{
  margin-top:10px;
  font-size:clamp(15px,1.02vw,16.5px);
  line-height:1.85;
  color:var(--ink-2);
}

/* ---------- 路径 ---------- */

.section--path{
  background:linear-gradient(180deg,var(--paper) 0%,#F9F0DA 7%,#E2F2FC 24%,#D6EDFB 62%,#D1EBFA 100%);
}
.path{position:relative;margin-top:clamp(40px,5vw,66px);}
.path__line{
  position:absolute;left:2%;right:2%;top:34px;
  height:0;border-top:3px dashed rgba(23,97,143,.28);
  transform:scaleX(0);transform-origin:left center;
  transition:transform 1.5s var(--ease) .1s;
}
.path.in .path__line{transform:scaleX(1);}

.steps{
  position:relative;
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:var(--gap);
}
.step{position:relative;display:flex;flex-direction:column;align-items:center;}
.step__badge{
  position:relative;z-index:2;
  width:68px;height:68px;
  display:grid;place-items:center;
  border-radius:50%;
  background:var(--paper-2);
  border:2px dashed rgba(23,97,143,.3);
  box-shadow:0 10px 22px -16px rgba(15,59,87,.9);
}
.step__badge::after{
  content:"";position:absolute;inset:5px;border-radius:50%;
  background:linear-gradient(150deg,#FFE9A8,#FFD24A);
  opacity:.85;
  z-index:-1;
}
.step__badge span{
  font-family:var(--font-d);
  font-size:20px;color:var(--sky-6);
}
.step:nth-child(2) .step__badge::after{background:linear-gradient(150deg,#D8F0C6,#A7DE84);}
.step:nth-child(3) .step__badge::after{background:linear-gradient(150deg,#D5EEFF,#9AD6F8);}
.step:nth-child(4) .step__badge::after{background:linear-gradient(150deg,#FFDCE8,#FFB4CE);}

.step__card{
  position:relative;
  margin-top:-14px;
  padding:34px clamp(18px,1.8vw,24px) clamp(20px,2vw,26px);
  width:100%;
  flex:1;
  background:var(--paper-2);
  border-radius:var(--r-l);
  border:1.5px solid rgba(255,255,255,.95);
  box-shadow:var(--shadow-s);
  transition:transform .45s var(--ease), box-shadow .45s var(--ease);
}
.step__card:hover{transform:translateY(-6px);box-shadow:var(--shadow-m);}
.step__icon{
  position:absolute;top:-16px;right:18px;
  width:40px;height:40px;display:grid;place-items:center;
  border-radius:14px;
  background:var(--sky-1);
  border:1.5px solid rgba(23,97,143,.12);
  rotate:-6deg;
}
.step__icon svg{width:21px;height:21px;fill:none;stroke:var(--sky-6);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;}
.step__card h3{font-size:clamp(18px,1.7vw,21px);}
.step__card p{
  margin-top:10px;
  font-size:clamp(14.5px,.98vw,16px);
  line-height:1.82;
  color:var(--ink-2);
}
.step__todo{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:2px 7px;
  align-items:start;
  margin-top:16px;
  padding-top:12px;
  border-top:1.5px dashed var(--line);
  font-size:13.5px;
  line-height:1.55;
  color:var(--ink-3);
}
.step__todo b{
  display:inline-block;
  font-family:var(--font-d);font-weight:400;
  color:var(--sky-6);
  background:rgba(143,213,246,.26);
  border-radius:999px;
  padding:1px 9px;
  font-size:12.5px;
  white-space:nowrap;
}
.step__arrow{
  position:absolute;
  top:clamp(96px,9vw,120px);
  right:calc(var(--gap) / -2 - 13px);
  width:26px;height:26px;
  color:var(--sky-5);
  opacity:.6;
  animation:arrowNudge 3.4s ease-in-out infinite;
}
.step:last-child .step__arrow{display:none;}
.step__arrow svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;}

/* ---------- 示例 ---------- */

.section--demo{
  background:linear-gradient(180deg,#D1EBFA 0%,#C6E5F9 46%,#D8EFFB 100%);
  overflow:hidden;
}
.section--demo::after{
  content:"";
  position:absolute;right:-8%;top:12%;
  width:min(520px,44vw);aspect-ratio:1;
  border-radius:50%;
  background:radial-gradient(circle at 40% 40%, rgba(255,255,255,.9), rgba(255,255,255,0) 66%);
  pointer-events:none;
}

.demo{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:clamp(18px,2.6vw,40px);
  margin-top:clamp(38px,4.6vw,60px);
}
.shot{position:relative;}
.shot__frame{
  position:relative;
  border-radius:var(--r-m);
  background:var(--paper-2);
  padding:10px 10px 0;
  box-shadow:var(--shadow-m);
  transition:transform .5s var(--ease), box-shadow .5s var(--ease);
}
.shot:hover .shot__frame{transform:translateY(-6px) rotate(-.7deg);box-shadow:var(--shadow-l);}
.shot:nth-child(2) .shot__frame{rotate:.8deg;}
.shot:nth-child(1) .shot__frame{rotate:-.8deg;}
.shot__frame img{
  display:block;width:100%;
  aspect-ratio:3/4;
  object-fit:cover;
  object-position:50% 0%;
  border-radius:10px 10px 4px 4px;
  background:var(--sky-1);
}
.shot__frame--raw img{object-fit:cover;object-position:50% 46%;background:#FBFAF4;padding:10px;}
.shot__tape{
  position:absolute;top:-11px;left:50%;translate:-50% 0;
  width:78px;height:22px;
  background:linear-gradient(180deg,rgba(255,236,166,.92),rgba(255,224,130,.78));
  border-radius:2px;
  rotate:-2deg;
  box-shadow:0 2px 6px -4px rgba(15,59,87,.6);
}
.shot__badge{
  position:absolute;top:16px;right:4px;
  font-family:var(--font-d);font-size:12.5px;letter-spacing:.08em;
  color:#fff;
  background:linear-gradient(140deg,var(--coral),var(--pink-2));
  padding:4px 13px;
  border-radius:999px;
  border:2px solid #FFFCF2;
  font-size:13px;
  box-shadow:0 10px 18px -10px rgba(201,58,110,.95);
  rotate:4deg;
}
.shot__meta{margin-top:20px;}
.shot__step{
  display:inline-block;
  font-family:var(--font-d);font-size:12.5px;letter-spacing:.16em;
  color:var(--sky-6);
  padding:2px 10px;border-radius:999px;
  background:rgba(255,255,255,.8);
  border:1px solid rgba(23,97,143,.14);
}
.shot__meta h3{font-size:clamp(19px,1.9vw,24px);margin-top:10px;}
.shot__meta p{margin-top:8px;color:var(--ink-2);font-size:clamp(14.5px,.98vw,16px);line-height:1.8;}
.demo__arrow{
  position:absolute;top:26%;right:calc(var(--gap) / -2 - 13px);
  width:26px;height:26px;color:var(--sky-5);opacity:.55;
  animation:arrowNudge 3.8s ease-in-out infinite;
}
.shot:last-child .demo__arrow{display:none;}
.demo__arrow svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;}

.pair-label{
  display:flex;align-items:center;gap:14px;
  width:min(940px,100%);
  margin:clamp(38px,4.4vw,58px) auto 0;
  font-size:12.5px;letter-spacing:.18em;color:var(--ink-3);
}
.pair-label::before,.pair-label::after{
  content:"";flex:1;height:0;
  border-top:1.5px dashed rgba(23,97,143,.22);
}
.comic-pair{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:clamp(16px,2.4vw,32px);
  width:min(940px,100%);
  margin:clamp(44px,5vw,72px) auto 0;
}
.comic{
  margin:0;
  border-radius:var(--r-m);
  background:var(--paper-2);
  padding:10px;
  box-shadow:var(--shadow-m);
  transition:transform .5s var(--ease);
}
.comic:hover{transform:translateY(-6px) rotate(-.6deg);}
.comic:nth-child(2):hover{transform:translateY(-6px) rotate(.6deg);}
.comic img{display:block;width:100%;border-radius:10px;}
.comic figcaption{
  display:flex;align-items:center;gap:8px;
  padding:12px 6px 4px;
  font-size:13.5px;color:var(--ink-3);letter-spacing:.06em;
}
.comic figcaption b{
  font-family:var(--font-d);font-weight:400;font-size:13px;
  color:var(--pink-2);
  background:rgba(255,143,182,.16);
  padding:1px 9px;border-radius:999px;
}

/* ---------- 成果 ---------- */

.section--show{
  background:linear-gradient(180deg,#D8EFFB 0%,#F0EFE6 12%,var(--paper) 26%);
}
.shows{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:clamp(20px,3vw,44px);
  margin-top:clamp(36px,4.4vw,58px);
}
.show{position:relative;display:flex;flex-direction:column;}
.show__media{
  border-radius:var(--r-l);
  overflow:hidden;
  background:var(--sky-1);
  box-shadow:var(--shadow-m);
}
.show__media img{
  display:block;width:100%;
  aspect-ratio:3/2;
  object-fit:cover;
  transition:transform .9s var(--ease);
}
.show:hover .show__media img{transform:scale(1.04);}
.show__label{
  position:relative;
  margin:-46px clamp(10px,1.6vw,26px) 0;
  padding:clamp(18px,2vw,24px) clamp(18px,2.1vw,26px);
  background:var(--paper-2);
  border-radius:var(--r-m);
  border:1.5px solid rgba(255,255,255,.95);
  box-shadow:var(--shadow-s);
}
.show__tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-d);font-size:12.5px;letter-spacing:.14em;
  color:var(--sky-6);
  background:rgba(143,213,246,.24);
  padding:3px 11px;border-radius:999px;
}
.show__tag svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;}
.show__label h3{font-size:clamp(19px,1.9vw,24px);margin-top:12px;}
.show__label p{margin-top:8px;color:var(--ink-2);font-size:clamp(14.5px,.98vw,16px);line-height:1.8;}

.note{
  margin-top:clamp(26px,3vw,40px);
  font-size:13px;letter-spacing:.04em;color:var(--ink-3);
  text-align:center;
}

/* ---------- 教师 ---------- */

.section--teacher{
  background:linear-gradient(180deg,var(--paper) 0%,#F8EFD8 30%,#E2F1E3 100%);
}
.checklist{
  margin-top:clamp(32px,4vw,52px);
  background:rgba(255,253,246,.66);
  border-radius:var(--r-xl);
  border:1.5px solid rgba(255,255,255,.9);
  box-shadow:var(--shadow-s);
  overflow:hidden;
}
.check{
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:clamp(14px,2vw,28px);
  padding:clamp(20px,2.4vw,30px) clamp(20px,2.6vw,34px);
  transition:background .4s var(--ease);
}
.check + .check{border-top:1.5px dashed var(--line);}
.check:hover{background:rgba(255,255,255,.7);}
.check__no{
  font-family:var(--font-d);
  font-size:clamp(26px,2.8vw,34px);
  line-height:1;
  color:transparent;
  -webkit-text-stroke:1.7px var(--sky-5);
  width:clamp(46px,5vw,64px);
  text-align:center;
}
.check__body h3{font-size:clamp(19px,1.9vw,23px);}
.check__body p{
  margin-top:6px;
  color:var(--ink-2);
  font-size:clamp(14.5px,.98vw,16px);
  line-height:1.8;
}
.check__icon{
  width:clamp(40px,4vw,50px);aspect-ratio:1;
  display:grid;place-items:center;
  border-radius:16px;
  background:var(--mint);
  rotate:4deg;
}
.check__icon svg{width:24px;height:24px;fill:none;stroke:var(--grass-2);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;}

.tip{
  position:relative;
  display:flex;gap:14px;
  margin-top:clamp(28px,3.4vw,44px);
  padding:clamp(20px,2.4vw,26px) clamp(20px,2.6vw,30px);
  background:linear-gradient(160deg,#FFF6D8,#FFEFC0);
  border-radius:var(--r-m);
  border:1.5px solid rgba(255,255,255,.9);
  box-shadow:var(--shadow-s);
  rotate:-.5deg;
}
.tip__pin{
  position:absolute;top:-9px;left:38px;
  width:56px;height:18px;
  background:linear-gradient(180deg,rgba(143,213,246,.85),rgba(86,183,236,.7));
  border-radius:2px;rotate:-3deg;
}
.tip p{font-size:clamp(14.5px,1vw,16.5px);line-height:1.86;color:#6B5420;}
.tip b{
  display:inline-block;
  font-family:var(--font-d);font-weight:400;
  color:#8A5A0B;
  margin-right:8px;
  letter-spacing:.06em;
}

/* ---------- 页脚 ---------- */

.foot{
  position:relative;
  color:#EAF4FA;
  background:
    radial-gradient(80% 60% at 82% 0%, rgba(86,183,236,.28), rgba(86,183,236,0) 60%),
    linear-gradient(180deg,#123F5C 0%,var(--dusk) 100%);
  padding:clamp(70px,8vw,120px) 0 clamp(30px,4vw,46px);
  overflow:hidden;
}
.wave--foot{bottom:auto;top:0;transform:rotate(180deg);}
.wave--foot path{fill:#E2F1E3;}
.foot__inner{position:relative;}
.foot__line{
  font-family:var(--font-d);
  font-size:clamp(28px,4.7vw,66px);
  line-height:1.3;
  letter-spacing:.02em;
  color:#FFFDF6;
  text-wrap:balance;
}
.foot__copy{
  margin-top:clamp(32px,4vw,54px);
  padding-top:clamp(16px,1.8vw,22px);
  border-top:1px solid rgba(234,244,250,.14);
  font-size:13px;letter-spacing:.04em;
  color:rgba(234,244,250,.58);
  text-wrap:balance;
}

/* ---------- 入场动画 ---------- */

html.js .reveal{
  opacity:0;
  transform:translateY(26px) scale(.99);
  transition:
    opacity .85s var(--ease),
    transform .85s var(--ease);
  transition-delay:calc(var(--i,0) * 100ms);
}
html.js .reveal.in{opacity:1;transform:none;}

/* ---------- 关键帧 ---------- */

@keyframes drift{
  from{transform:translate3d(0,0,0);}
  to{transform:translate3d(160vw,0,0);}
}
@keyframes fall{
  0%{transform:translate3d(0,-10vh,0) rotate(0deg);opacity:0;}
  10%{opacity:.85;}
  50%{transform:translate3d(38px,45vh,0) rotate(180deg);}
  100%{transform:translate3d(-14px,112vh,0) rotate(360deg);opacity:.1;}
}
@keyframes posterFloat{
  0%,100%{transform:translateY(0);}
  50%{transform:translateY(-9px);}
}
@keyframes blobFloat{
  0%,100%{transform:translate3d(0,0,0) scale(1);}
  50%{transform:translate3d(3vw,-2vh,0) scale(1.08);}
}
@keyframes cueBounce{
  0%,100%{transform:translateY(0);}
  50%{transform:translateY(6px);}
}
@keyframes arrowNudge{
  0%,100%{transform:translateX(0);}
  50%{transform:translateX(5px);}
}

/* ============================================================
   平板
   ============================================================ */
@media (max-width:1080px){
  .shifts{grid-template-columns:repeat(3,1fr);}
  .step__card{padding-inline:16px;}
  .step__card p{font-size:14.5px;}
}

/* ============================================================
   手机（<900：改用竖版首屏）
   ============================================================ */
@media (max-width:899px){
  html{scroll-padding-top:84px;}

  .nav{width:min(680px,95vw);padding:6px 8px;gap:8px;}
  .nav__text i{display:none;}
  .nav__links a{padding:0 11px;font-size:13px;}

  .hero{
    padding:calc(74px + env(safe-area-inset-top)) 16px clamp(104px,26vw,132px);
    justify-content:flex-start;
  }
  .hero__body{gap:clamp(16px,4vw,22px);margin-top:auto;margin-bottom:auto;}

  .hero__intro{
    position:static;width:100%;height:auto;padding:0;margin:0;
    overflow:visible;clip:auto;clip-path:none;white-space:normal;
    display:flex;flex-direction:column;align-items:center;gap:14px;
    text-align:center;
  }
  .hero__title{
    font-family:var(--font-d);
    font-size:clamp(34px,10.4vw,54px);
    line-height:1.24;
    letter-spacing:.02em;
    color:var(--sky-6);
    display:flex;flex-direction:column;align-items:center;
  }
  .hero__title i{
    display:block;font-style:normal;
    font-size:1.14em;
    letter-spacing:.01em;
    background:linear-gradient(96deg,#EE3A76 0%,#EE6A2C 32%,#C98A00 56%,#0C8A83 88%);
    -webkit-background-clip:text;background-clip:text;
    color:transparent;
    filter:
      drop-shadow(0 0 2px #FFFCF2)
      drop-shadow(0 0 2px #FFFCF2)
      drop-shadow(0 0 1px #FFFCF2)
      drop-shadow(0 7px 0 rgba(23,97,143,.16));
  }

  .poster{
    width:min(680px,100%);
    border-radius:22px;
    padding:6px;
  }
  .poster img{border-radius:17px;}

  .hero__foot{gap:12px;}
  .hero__tagline{font-size:clamp(17px,4.6vw,22px);}
  .hero__chips li{font-size:12px;padding:5px 11px;letter-spacing:.06em;}

  .cloud--1{top:12%;}
  .cloud--2{top:5%;}
  .cloud--3{bottom:34%;}

  .section{padding:clamp(52px,9vw,72px) 0;}
  .sec-title{font-size:clamp(24px,7vw,34px);}
  .lead{font-size:16px;line-height:1.9;}

  .shifts{grid-template-columns:1fr;gap:14px;}
  .shift{padding:20px 20px 22px;}

  .steps{grid-template-columns:1fr;gap:16px;}
  .step{
    flex-direction:row;align-items:flex-start;gap:14px;
    padding-left:0;
  }
  .step__badge{
    width:52px;height:52px;flex:none;
    position:relative;z-index:2;
  }
  .step__badge span{font-size:16px;}
  .step__card{margin-top:0;padding:20px 18px 18px;}
  .step__icon{width:34px;height:34px;top:-12px;right:14px;border-radius:11px;}
  .step__icon svg{width:18px;height:18px;}
  .step__arrow{display:none;}
  .path__line{display:none;}
  .path::before{
    content:"";position:absolute;left:25px;top:26px;bottom:26px;
    width:0;border-left:3px dashed rgba(23,97,143,.24);
    transform:scaleY(0);transform-origin:top;
    transition:transform 1.4s var(--ease) .15s;
  }
  .path.in::before{transform:scaleY(1);}

  .demo{grid-template-columns:1fr;gap:clamp(26px,7vw,36px);}
  .shot__frame img{aspect-ratio:4/5;object-position:50% 26%;}
  .shot__frame--raw img{aspect-ratio:4/3;object-position:50% 46%;}
  .demo__arrow{
    top:auto;bottom:-30px;left:50%;right:auto;translate:-50% 0;
    rotate:90deg;
  }

  .pair-label{
  display:flex;align-items:center;gap:14px;
  width:min(940px,100%);
  margin:clamp(38px,4.4vw,58px) auto 0;
  font-size:12.5px;letter-spacing:.18em;color:var(--ink-3);
}
.pair-label::before,.pair-label::after{
  content:"";flex:1;height:0;
  border-top:1.5px dashed rgba(23,97,143,.22);
}
.comic-pair{grid-template-columns:1fr;width:min(420px,100%);gap:20px;}

  .shows{grid-template-columns:1fr;gap:28px;}
  .show__media img{aspect-ratio:16/10;}
  .show__label{margin:-40px 12px 0;}

  .checklist{border-radius:var(--r-l);}
  .check{grid-template-columns:auto 1fr;gap:14px;padding:18px 18px;}
  .check__icon{display:none;}
  .check__no{width:38px;font-size:26px;}

  .foot__copy{font-size:12px;letter-spacing:.02em;}
}

@media (max-width:520px){
  .nav__links li:nth-child(1),
  .nav__links li:nth-child(5){display:none;}
  .hero__title{font-size:clamp(30px,10.6vw,40px);}
  .eyebrow{font-size:12px;padding:6px 13px 6px 10px;}
  .sec-head--center{text-align:left;}
  .sec-head--center .lead{margin-inline:0;}
}

/* ============================================================
   大屏
   ============================================================ */
@media (min-width:1600px){
  .wrap{width:min(1320px,90vw);}
  :root{--gap:34px;}
  .poster{width:min(1780px,92vw);width:min(1780px,92vw,152dvh);}
}

/* ============================================================
   动效偏好
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{opacity:1;transform:none;}
  .path .path__line{transform:scaleX(1);}
  .path::before{transform:scaleY(1);}
  .petals{display:none;}
}

/* 短屏笔记本：压低首屏留白，保证一屏内收尾 */
@media (min-width:900px) and (max-height:800px){
  .hero{padding-top:calc(74px + env(safe-area-inset-top));padding-bottom:clamp(84px,11vh,120px);}
  .poster{width:min(1500px,88vw);width:min(1500px,88vw,126dvh);}
  .hero__tagline{font-size:clamp(19px,2.2vw,26px);}
  .hero__chips li{padding:5px 12px;}
  .wave--hero svg{height:clamp(72px,10vh,104px);}
}