:root{
  --ink:#eef2ff;
  --muted:rgba(238,242,255,.62);
  --line:rgba(255,255,255,.12);
  --glass:rgba(255,255,255,.05);
  --glass2:rgba(255,255,255,.09);
  --accent:#a5b4fc;
  --grad1:#1e1b4b;
  --grad2:#3b2f6b;
  --grad3:#0f0c29;
  --shadow:0 20px 60px rgba(2,6,23,.45);
  --r:22px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  min-height:100vh;
  font-family:"PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink);
  background:radial-gradient(120% 100% at 50% 0%,var(--grad1) 0%,var(--grad2) 46%,var(--grad3) 100%);
  background-attachment:fixed;
  overflow-x:hidden;
  line-height:1.7;
}
::selection{background:rgba(165,180,252,.4)}

/* ---------- 背景几何 ---------- */
.bg{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.bg-glow{position:absolute;border-radius:50%;filter:blur(90px);opacity:.5;animation:drift 22s ease-in-out infinite alternate}
.bg-glow--1{width:520px;height:520px;left:-120px;top:-80px;background:#6d5bd0;opacity:.4}
.bg-glow--2{width:460px;height:460px;right:-100px;bottom:-60px;background:#22d3ee;opacity:.18;animation-delay:-8s}
@keyframes drift{to{transform:translate(40px,30px) scale(1.12)}}
.stars{position:absolute;inset:0}
.stars i{position:absolute;display:block;border-radius:50%;background:#cbd5ff;
  animation:twinkle var(--dr,4s) ease-in-out var(--dl,0s) infinite alternate}
.stars i.star{
  background:transparent;width:0;height:0;
  border-left:calc(var(--s) * .5) solid transparent;border-right:calc(var(--s) * .5) solid transparent;
  border-bottom:var(--s) solid #cdd8ff;opacity:.9;
  clip-path:polygon(50% 0,62% 38%,100% 50%,62% 62%,50% 100%,38% 62%,0 50%,38% 38%);
}
@keyframes twinkle{from{opacity:.25}to{opacity:1}}
.moon{position:absolute;top:64px;right:12%;width:88px;height:88px;border-radius:50%;
  background:radial-gradient(circle at 38% 34%,#fff7dc,#e8dcff 70%);
  box-shadow:0 0 46px 10px rgba(255,244,214,.35),inset -14px -10px 0 rgba(122,110,190,.22);
  opacity:.92;animation:moonglide 26s ease-in-out infinite alternate;}
@keyframes moonglide{to{transform:translate(-22px,14px)}}

.shell{position:relative;z-index:2;max-width:1000px;margin:0 auto;padding:34px 20px 60px}

/* ---------- 顶部 ---------- */
.top{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:34px}
.brand{display:flex;align-items:center;gap:16px}
.brand__badge{width:56px;height:56px;border-radius:16px;position:relative;
  background:linear-gradient(140deg,#6366f1,#a78bfa);
  box-shadow:0 10px 30px rgba(99,102,241,.5);display:grid;place-items:center}
.brand__badge::after{content:"";position:absolute;left:18px;top:12px;width:18px;height:18px;border-radius:50%;
  background:#fff;box-shadow:5px 4px 0 -3px #a78bfa}
.brand__moon{width:16px;height:16px;border-radius:50%;background:#fff;box-shadow:inset 6px -4px 0 #6366f1}
.brand__text h1{font-size:26px;font-weight:800;letter-spacing:2px;
  background:linear-gradient(90deg,#fff,#cdd6ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.brand__text p{color:var(--muted);font-size:13px}
.date-chip{padding:10px 18px;font-size:14px;letter-spacing:1px}

.glass{background:var(--glass);border:1px solid var(--line);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-radius:var(--r);box-shadow:var(--shadow)}

/* ---------- 步骤 ---------- */
.step{margin-top:34px}
.step__head{display:flex;gap:16px;margin-bottom:18px;align-items:flex-start}
.step__num{font-size:15px;font-weight:800;color:transparent;background:linear-gradient(135deg,#a5b4fc,#67e8f9);
  -webkit-background-clip:text;background-clip:text;padding:6px 12px;border:1px solid var(--line);border-radius:999px}
.step__head h2{font-size:21px;font-weight:700}
.step__head p{color:var(--muted);font-size:13px}

/* ---------- 话题卡片 ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.card{position:relative;cursor:pointer;padding:20px 20px 18px;border-radius:var(--r);
  background:linear-gradient(150deg,var(--glass2),rgba(255,255,255,.02));
  border:1px solid var(--line);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  overflow:hidden;transition:transform .35s cubic-bezier(.2,.7,.3,1.3),border-color .3s,box-shadow .3s}
.card::before{content:"";position:absolute;top:-40px;right:-40px;width:110px;height:110px;
  background:radial-gradient(circle,rgba(165,180,252,.4),transparent 70%);opacity:.5}
.card:hover{transform:translateY(-6px);border-color:rgba(165,180,252,.55);box-shadow:0 18px 44px rgba(6,10,40,.5)}
.card--on{background:linear-gradient(150deg,rgba(99,102,241,.45),rgba(103,232,249,.18));border-color:#a5b4fc;
  box-shadow:0 0 0 1px rgba(165,180,252,.4)}
.card .geom{position:absolute;left:18px;top:18px;width:14px;height:14px;opacity:.9;
  transform:rotate(45deg);transition:transform .4s}
.card--on .geom{transform:rotate(45deg) scale(1.4)}
.card h3{font-size:18px;font-weight:700;margin:22px 0 6px}
.card p{color:var(--muted);font-size:13px}
.card .chk{position:absolute;right:16px;top:16px;width:22px;height:22px;border-radius:50%;
  border:1.6px solid var(--line);display:grid;place-items:center;font-size:12px;color:transparent}
.card--on .chk{background:linear-gradient(140deg,#6366f1,#a78bfa);border-color:transparent;color:#fff}

/* ---------- 按钮 ---------- */
.action-row{margin-bottom:20px}
.btn{position:relative;overflow:hidden;display:inline-flex;align-items:center;gap:10px;
  padding:14px 30px;font-size:16px;font-weight:700;color:#fff;cursor:pointer;border:none;border-radius:999px;
  background:linear-gradient(120deg,#6366f1,#8b5cf6 55%,#d946ef);
  box-shadow:0 12px 34px rgba(139,92,246,.45);transition:transform .25s,box-shadow .25s,filter .25s}
.btn:hover{transform:translateY(-2px);box-shadow:0 16px 44px rgba(139,92,246,.6)}
.btn:active{transform:translateY(0)}
.btn:disabled{filter:grayscale(.8) opacity(.6);cursor:not-allowed;transform:none}
.btn__spark{width:8px;height:8px;border-radius:50%;background:#fff;
  box-shadow:0 0 0 4px rgba(255,255,255,.25);animation:pulse 1.6s ease-in-out infinite}
@keyframes pulse{50%{box-shadow:0 0 0 8px rgba(255,255,255,0)}}
.loading .btn__spark{animation:none;border-radius:0;background:transparent;border:2px solid #fff;
  border-top-color:transparent;width:14px;height:14px;animation:spin .7s linear infinite}
.loading{pointer-events:none;opacity:.9}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- 故事书本 ---------- */
.book{position:relative;padding:34px 30px 26px;margin-top:6px;
  background:linear-gradient(160deg,var(--glass2),rgba(255,255,255,.02));
  animation:rise .6s cubic-bezier(.2,.7,.3,1)}
.book__ribbon{position:absolute;left:26px;top:0;width:64px;height:8px;border-radius:0 0 8px 8px;
  background:linear-gradient(90deg,#f59e0b,#f472b6)}
.book__title{font-size:24px;font-weight:800;margin-bottom:14px;text-align:center;
  background:linear-gradient(90deg,#fff,#c7d2fe);-webkit-background-clip:text;background-clip:text;color:transparent}
.book__text{font-size:16px;color:#e7ecff;text-align:justify;white-space:pre-wrap}
.book__text::first-letter{font-size:2.7em;float:left;line-height:1;font-weight:800;color:#fbbf24;margin-right:8px}
.book__mood{margin-top:22px;padding:14px 18px;border-radius:16px;font-size:14px;color:#dbeafe;
  background:linear-gradient(120deg,rgba(99,102,241,.28),rgba(34,211,238,.14));border:1px dashed rgba(165,180,252,.5)}
.book__mood b{color:#fcd34d}
@keyframes rise{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}

/* ---------- 卡片舞台 ---------- */
.card-stage{display:grid;place-items:center;min-height:120px}
.loader{text-align:center;display:grid;place-items:center;gap:14px;color:var(--muted)}
.loader[hidden]{display:none !important}
.loader__ring{width:56px;height:56px;border-radius:50%;border:3px solid rgba(255,255,255,.15);
  border-top-color:#a5b4fc;animation:spin 1s linear infinite;
  background:conic-gradient(from 0deg,transparent 0 220deg,rgba(165,180,252,.6)) none}
.polaroid{width:min(420px,92%);background:#fbf9f4;border-radius:18px;padding:14px 14px 18px;color:#333;
  box-shadow:0 30px 70px rgba(2,6,23,.55);transform:rotate(-2deg);
  animation:rise .6s cubic-bezier(.2,.7,.3,1)}
.polaroid__img{position:relative;overflow:hidden;border-radius:10px;aspect-ratio:1/1;background:#111;display:grid;place-items:center}
.polaroid__img img{width:100%;height:100%;object-fit:cover}
.polaroid figcaption{text-align:center;padding-top:14px}
.polaroid__message{font-size:19px;font-weight:700;letter-spacing:2px;color:#4a3f8f}
.polaroid__date{margin-top:6px;font-size:12px;color:#a09bbf;letter-spacing:1px}

/* ---------- 底部 ---------- */
.foot{margin-top:60px;text-align:center;color:var(--muted);font-size:14px;display:grid;gap:8px}
.foot__dots{letter-spacing:10px;color:#a5b4fc}

/* ---------- Toast ---------- */
.toast{position:fixed;left:50%;bottom:34px;transform:translateX(-50%) translateY(140%);
  padding:13px 22px;border-radius:999px;background:rgba(20,18,45,.9);border:1px solid var(--line);
  color:#fff;font-size:14px;z-index:60;transition:transform .4s cubic-bezier(.2,.7,.3,1);max-width:86%;text-align:center}
.toast.show{transform:translateX(-50%) translateY(0)}
.toast.err{border-color:rgba(248,113,113,.5)}

@media (max-width:620px){
  .top{flex-direction:column;align-items:flex-start}
  .brand__text h1{font-size:22px}
}