/* ══════════════════════════════════════════════════════
   《投資不踩雷》聽眾提問前台 — 設計系統
   Gemini 式淺色漸層 · 玻璃卡片 · cwTeX Q Kai 楷體標題
   招牌元素：一條「安全路徑」串起三個步驟
   ══════════════════════════════════════════════════════ */
:root{
  --ink:#2B2B33;
  --ink-soft:#4A4A56;
  --muted:#7A7A88;
  --line:rgba(43,43,51,.12);
  --line-soft:rgba(43,43,51,.08);

  --accent:#6D6AF0;
  --accent-press:#5754D6;
  --accent-soft:rgba(109,106,240,.12);
  --signal:#F0A6C0;
  --danger:#C05A4A;

  --glass:rgba(255,255,255,.62);
  --glass-strong:rgba(255,255,255,.78);
  --glass-border:rgba(255,255,255,.75);

  --radius:20px;
  --radius-sm:14px;
  --shadow-sm:0 1px 2px rgba(43,43,51,.05), 0 8px 24px rgba(109,106,240,.08);
  --shadow-md:0 8px 20px rgba(109,106,240,.12), 0 2px 6px rgba(43,43,51,.05);
  --ease:cubic-bezier(.22,.61,.36,1);

  --sans:"Noto Sans TC",-apple-system,BlinkMacSystemFont,"PingFang TC","Microsoft JhengHei",sans-serif;
  --display:"cwTeX Q Kai","Noto Serif TC",serif;
}

*{box-sizing:border-box}
html,body{margin:0}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:
    radial-gradient(48% 40% at 82% 8%, rgba(253,239,245,.9) 0%, transparent 70%),
    radial-gradient(46% 38% at 8% 18%, rgba(234,242,255,.95) 0%, transparent 70%),
    radial-gradient(60% 50% at 50% 100%, rgba(241,234,251,.9) 0%, transparent 70%),
    linear-gradient(160deg, #EAF2FF 0%, #F1EAFB 52%, #FDEFF5 100%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  min-height:100svh;
  line-height:1.65;
}

/* ── 版面容器 ─────────────────────────────────────── */
.stage{
  position:relative;
  width:100%;
  max-width:560px;
  margin:0 auto;
  min-height:100svh;
  padding:26px 22px calc(30px + env(safe-area-inset-bottom));
  display:flex;
  flex-direction:column;
}

/* ── 螢幕切換與轉場 ───────────────────────────────── */
.screen{ flex:1; display:none; flex-direction:column; }
.screen.is-active{ display:flex; }
.screen.anim-fwd{ animation:inFwd .45s var(--ease) both; }
.screen.anim-back{ animation:inBack .45s var(--ease) both; }
@keyframes inFwd { from{opacity:0; transform:translate3d(20px,0,0)} to{opacity:1; transform:none} }
@keyframes inBack{ from{opacity:0; transform:translate3d(-20px,0,0)} to{opacity:1; transform:none} }

/* ══ 入口頁 ═══════════════════════════════════════ */
.intro{ display:flex; flex-direction:column; align-items:flex-start; margin:auto 0; padding:8px 0; }

.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  margin:0 0 18px; font-size:12.5px; font-weight:700;
  letter-spacing:.14em; color:var(--accent-press); text-transform:uppercase;
}
.eyebrow__dot{ width:7px; height:7px; border-radius:50%; background:var(--signal);
  box-shadow:0 0 0 5px rgba(240,166,192,.22); }

.intro__title{ margin:0 0 20px; }
.intro__title-show{
  display:block; font-family:var(--display); font-weight:700; color:var(--ink);
  font-size:clamp(36px,9.6vw,50px); line-height:1.22; margin-bottom:6px; letter-spacing:.01em;
}
.intro__title-main{
  display:block; font-family:var(--display); font-weight:600;
  color:var(--accent-press); font-size:clamp(24px,6vw,30px);
  line-height:1.35; letter-spacing:.02em;
}
.intro__lead{
  font-size:16px; color:var(--ink-soft); margin:0 0 32px; max-width:19em;
}
.intro__meta{ margin:18px 0 0; font-size:13px; color:var(--muted); letter-spacing:.02em; }

@media (min-width:380px){
  .intro__lead{ max-width:23em; }
}

/* ══ 路徑進度（招牌元件） ══════════════════════════ */
.path{ display:flex; align-items:center; gap:14px; margin:2px 0 32px; }
.path[hidden]{ display:none; }
.path__back{
  flex:0 0 auto; width:40px; height:40px; border-radius:50%;
  border:1px solid var(--glass-border); background:var(--glass); color:var(--ink-soft);
  backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px);
  font-size:18px; cursor:pointer; display:grid; place-items:center;
  transition:transform .18s var(--ease), background .18s;
}
.path__back:hover{ background:var(--glass-strong); }
.path__back:active{ transform:scale(.92); }

.path__track{ position:relative; flex:1; height:24px; display:flex; align-items:center; }
.path__line{ position:absolute; left:11px; right:11px; height:2px; background:var(--line); border-radius:2px; }
.path__line i{ position:absolute; left:0; top:0; height:100%; width:0%;
  background:linear-gradient(90deg,var(--accent),var(--signal)); border-radius:2px;
  transition:width .5s var(--ease); }
.path__nodes{ position:relative; z-index:1; display:flex; justify-content:space-between;
  align-items:center; width:100%; margin:0; padding:0; list-style:none; }
.node{ width:14px; height:14px; border-radius:50%; background:var(--glass-strong);
  border:2px solid var(--line); transition:all .35s var(--ease); }
.node.is-done{ background:var(--accent); border-color:var(--accent); }
.node.is-active{ border-color:var(--signal); background:var(--glass-strong);
  box-shadow:0 0 0 5px rgba(240,166,192,.2); transform:scale(1.12); }
.node.is-active::after{ content:""; display:block; width:6px; height:6px; margin:2px;
  border-radius:50%; background:var(--signal); }

/* ══ 步驟頁 ═══════════════════════════════════════ */
.step{ margin-top:2px; }
.eyebrow--step{ color:var(--muted); }
.step__title{
  font-family:var(--display); font-weight:700; color:var(--ink);
  font-size:clamp(24px,6.6vw,30px); line-height:1.36; margin:0 0 14px;
}
.step__help{ font-size:15px; color:var(--muted); margin:0 0 26px; max-width:38ch; }

/* ── 輸入（玻璃質感） ─────────────────────────────── */
.field{ position:relative; }
.input{
  width:100%; font-family:var(--sans); font-size:17px; color:var(--ink);
  background:var(--glass); border:1.5px solid var(--glass-border); border-radius:var(--radius-sm);
  padding:16px; line-height:1.6; box-shadow:var(--shadow-sm);
  backdrop-filter:blur(16px) saturate(160%); -webkit-backdrop-filter:blur(16px) saturate(160%);
  transition:border-color .2s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease);
  -webkit-appearance:none; appearance:none;
}
.input::placeholder{ color:#9C9CAE; }
.input:focus{ outline:none; border-color:var(--accent);
  background:var(--glass-strong);
  box-shadow:0 0 0 4px rgba(109,106,240,.14); }
.input--area{ resize:none; overflow:hidden; min-height:132px; display:block; }
.field.has-error .input{ border-color:var(--danger); box-shadow:0 0 0 4px rgba(192,90,74,.12); }
.field.has-error .input--area,
.field.has-error .input{ animation:nudge .32s var(--ease); }
@keyframes nudge{ 0%,100%{transform:none} 25%{transform:translateX(-5px)} 75%{transform:translateX(5px)} }
.field__error{ margin:10px 2px 0; font-size:13.5px; color:var(--danger); }
.field__error[hidden]{ display:none; }

.chip{
  margin-top:12px; font-family:var(--sans); font-size:14px; font-weight:500;
  color:var(--accent-press); background:var(--accent-soft); border:none; border-radius:999px;
  padding:9px 16px; cursor:pointer; transition:transform .15s var(--ease), filter .15s;
}
.chip:hover{ filter:brightness(.97); }
.chip:active{ transform:scale(.95); }
.chip.is-on{ background:var(--accent); color:#fff; }

/* ── 動作列 ───────────────────────────────────────── */
.actions{ display:flex; flex-direction:column; gap:12px; margin-top:30px; }

/* ── 按鈕 ─────────────────────────────────────────── */
.btn{
  font-family:var(--sans); font-size:16px; font-weight:700; letter-spacing:.02em;
  border:none; border-radius:var(--radius-sm); padding:16px 22px; cursor:pointer;
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  transition:transform .16s var(--ease), background .18s, box-shadow .18s, opacity .18s;
  text-decoration:none;
}
.btn--lg{ padding:18px 26px; font-size:17px; }
.btn--primary{ background:linear-gradient(135deg,var(--accent),#8B7EF2); color:#fff;
  box-shadow:0 10px 24px rgba(109,106,240,.28); }
.btn--primary:hover{ background:linear-gradient(135deg,var(--accent-press),var(--accent)); }
.btn--primary:active{ transform:translateY(1px) scale(.99); box-shadow:0 5px 14px rgba(109,106,240,.26); }
.btn--ghost{ background:transparent; color:var(--ink-soft); box-shadow:none; }
.btn--ghost:hover{ background:rgba(43,43,51,.05); }
.btn--ghost:active{ transform:scale(.98); }
.btn[disabled]{ opacity:.55; cursor:default; pointer-events:none; }
.btn__arrow{ font-size:1em; transition:transform .2s var(--ease); }
.btn--primary:hover .btn__arrow{ transform:translateX(3px); }

/* ══ 送出中 ═══════════════════════════════════════ */
.sending{ margin:auto; display:flex; flex-direction:column; align-items:center; gap:22px; }
.sending__spinner{ display:flex; gap:9px; }
.sending__spinner span{ width:11px; height:11px; border-radius:50%; background:var(--accent);
  animation:bob 1.1s var(--ease) infinite; }
.sending__spinner span:nth-child(2){ animation-delay:.15s; background:var(--signal); }
.sending__spinner span:nth-child(3){ animation-delay:.30s; }
@keyframes bob{ 0%,100%{transform:translateY(0); opacity:.5} 40%{transform:translateY(-9px); opacity:1} }
.sending__text{ font-size:15px; color:var(--muted); }

/* ══ 完成頁 ═══════════════════════════════════════ */
.done{ margin:auto 0; padding:12px 0; animation:inFwd .5s var(--ease) both; }
.done__mark{ width:64px; height:64px; margin-bottom:26px; }
.done__mark svg{ width:100%; height:100%; }
.done__mark circle{ fill:none; stroke:var(--accent); stroke-width:2.5;
  stroke-dasharray:151; stroke-dashoffset:151; animation:draw .7s var(--ease) .1s forwards; }
.done__mark path{ fill:none; stroke:var(--accent); stroke-width:3.4; stroke-linecap:round;
  stroke-linejoin:round; stroke-dasharray:40; stroke-dashoffset:40;
  animation:draw .45s var(--ease) .6s forwards; }
@keyframes draw{ to{ stroke-dashoffset:0; } }

.done__title{ font-family:var(--display); font-weight:700; color:var(--ink);
  font-size:clamp(24px,6.4vw,29px); line-height:1.42; margin:0 0 16px; }
.done__body{ font-size:15.5px; color:var(--ink-soft); margin:0 0 30px; }

.cta{ background:var(--glass); border:1px solid var(--glass-border); border-radius:var(--radius);
  padding:26px 22px; box-shadow:var(--shadow-md);
  backdrop-filter:blur(20px) saturate(160%); -webkit-backdrop-filter:blur(20px) saturate(160%); }
.cta__head{ display:flex; align-items:center; gap:12px; margin:0 0 12px; }
.cta__icon{
  flex:0 0 auto; width:38px; height:38px; border-radius:50%;
  background:linear-gradient(135deg,var(--accent),#8B7EF2);
  display:grid; place-items:center; box-shadow:0 6px 14px rgba(109,106,240,.3);
}
.cta__icon svg{ width:18px; height:18px; }
.cta__title{ font-family:var(--display); font-weight:700; font-size:19px; margin:0; color:var(--ink); }
.cta__desc{ font-size:14.5px; color:var(--muted); margin:0 0 22px; }
.cta .btn{ width:100%; }

.done__ps{ font-size:14px; color:var(--muted); margin:26px 2px 20px; }
.done .btn--ghost{
  width:100%; justify-content:center; margin-top:26px;
}

/* ══ Toast ════════════════════════════════════════ */
.toast{
  position:fixed; left:50%; bottom:calc(24px + env(safe-area-inset-bottom));
  transform:translate(-50%,14px); z-index:50;
  background:var(--ink); color:#F4F4F8; font-size:14px; font-weight:500;
  padding:12px 20px; border-radius:999px; box-shadow:var(--shadow-md);
  opacity:0; pointer-events:none; transition:opacity .28s var(--ease), transform .28s var(--ease);
  max-width:88vw; text-align:center;
}
.toast[hidden]{ display:none; }
.toast.is-show{ opacity:1; transform:translate(-50%,0); }

/* ══ 桌機微調 ═════════════════════════════════════ */
@media (min-width:600px){
  .stage{ padding-top:56px; padding-bottom:56px; justify-content:center; }
  .btn--primary,.chip{ cursor:pointer; }
}

/* ══ 無障礙 ═══════════════════════════════════════ */
:focus-visible{ outline:3px solid rgba(109,106,240,.5); outline-offset:2px; border-radius:6px; }
@media (prefers-reduced-motion:reduce){
  *{ animation-duration:.001ms !important; animation-iteration-count:1 !important;
     transition-duration:.001ms !important; }
  .done__mark circle,.done__mark path{ stroke-dashoffset:0; }
}