:root{
  --bg:#fbfbfd;
  --surface:#ffffff;
  --ink:#1d1d1f;
  --ink-2:#6e6e73;
  --ink-3:#aeaeb2;
  --line:rgba(0,0,0,.08);
  --line-2:rgba(0,0,0,.045);
  --kraft-1:#d9c1a0;
  --kraft-2:#c7a87f;
  --kraft-3:#b8946a;
  --letter-ink:#2a1d10;
  --sans:"Noto Sans TC",-apple-system,BlinkMacSystemFont,"SF Pro TC","PingFang TC",sans-serif;
  --serif:"Noto Serif TC",serif;
  --kai:"LXGW WenKai TC","BiauKai","DFKai-SB","KaiTi TC","Kaiti TC","TW-Kai","Noto Serif TC",serif;
  --r:18px;
  --r-lg:28px;
  --ease:cubic-bezier(.4,0,.1,1);
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--sans);color:var(--ink);background:var(--bg);
  line-height:1.5;font-weight:400;letter-spacing:-.01em;overflow-x:hidden;
}
.wrap{max-width:980px;margin:0 auto;padding:0 22px;width:100%}
img{display:block;max-width:100%}
::selection{background:var(--ink);color:#fff}

/* ---------- nav ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:60;height:48px;
  display:flex;align-items:center;justify-content:center;
  background:rgba(251,251,253,.72);backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--line-2);
}
.nav-inner{max-width:980px;width:100%;padding:0 22px;display:flex;align-items:center;justify-content:space-between}
.logo{font-weight:500;font-size:15px;letter-spacing:-.02em;text-decoration:none;color:var(--ink);display:flex;align-items:center}
.logo img{width:118px;height:auto;display:block}
.nav-links{display:flex;gap:28px}
.nav-links a{font-size:13px;color:var(--ink-2);text-decoration:none;transition:color .3s var(--ease)}
.nav-links a:hover{color:var(--ink)}
@media(max-width:600px){.nav-links{display:none}}

/* ---------- hero ---------- */
.hero{padding:160px 0 90px;text-align:center}
.hero .kicker{
  font-size:14px;font-weight:500;color:var(--kraft-3);letter-spacing:.02em;margin-bottom:18px;
  opacity:0;animation:fade .9s .05s var(--ease) forwards;
}
.hero h1{
  font-size:clamp(40px,8vw,76px);font-weight:700;line-height:1.05;letter-spacing:-.035em;
  margin-bottom:22px;
}
.hero h1 span{display:block;opacity:0;animation:fade 1s var(--ease) forwards}
.hero h1 span:nth-child(1){animation-delay:.12s}
.hero h1 span:nth-child(2){animation-delay:.24s}
.hero h1 .muted{color:var(--ink-3)}
.hero p.sub{
  font-size:clamp(17px,2.4vw,21px);color:var(--ink-2);font-weight:300;max-width:30ch;
  margin:0 auto 36px;line-height:1.5;letter-spacing:-.01em;
  opacity:0;animation:fade 1s .4s var(--ease) forwards;
}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;opacity:0;animation:fade 1s .55s var(--ease) forwards}

.btn{
  font-family:var(--sans);font-size:15px;font-weight:400;letter-spacing:-.01em;
  padding:11px 24px;border-radius:980px;border:none;cursor:pointer;text-decoration:none;
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  transition:transform .25s var(--ease),background .25s var(--ease),opacity .25s var(--ease);
}
.btn:disabled{cursor:wait;opacity:.58;transform:none}
.btn-fill{background:var(--ink);color:#fff}
.btn-fill:hover{background:#000;transform:scale(1.015)}
.btn-text{background:transparent;color:var(--ink);padding:11px 8px}
.btn-text:hover{opacity:.55}
.btn-text .arrow{transition:transform .3s var(--ease)}
.btn-text:hover .arrow{transform:translateX(3px)}

@keyframes fade{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}

/* ---------- hero image + floating letter ---------- */
.hero-visual{
  position:relative;max-width:860px;margin:64px auto 0;
  opacity:0;animation:fade 1.1s .65s var(--ease) forwards;
}
.hero-photo{
  position:relative;aspect-ratio:16/8.5;border-radius:var(--r-lg);overflow:hidden;
  background:#eee6dc;border:1px solid var(--line);
  box-shadow:0 34px 80px -48px rgba(0,0,0,.34);
}
.hero-photo img{width:100%;height:100%;object-fit:cover;object-position:center 46%}
.hero-photo::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(20,16,12,.02),rgba(20,16,12,.34));
}
.photo-caption{
  position:absolute;z-index:1;left:28px;top:24px;color:rgba(255,255,255,.82);
  font-size:12px;font-weight:300;letter-spacing:.03em;text-shadow:0 1px 12px rgba(0,0,0,.28);
}
.hero-letter{margin:64px auto 0;max-width:560px;opacity:0;animation:fade 1.1s .7s var(--ease) forwards}
.hero-visual .hero-letter{
  position:absolute;left:50%;bottom:34px;width:min(520px,calc(100% - 56px));
  margin:0;max-width:none;opacity:1;animation:none;transform:translateX(-50%);
}
.letter-card{
  position:relative;border-radius:var(--r-lg);overflow:hidden;
  background:
    linear-gradient(150deg,rgba(217,193,160,.78),rgba(199,168,127,.72) 55%,rgba(184,148,106,.78)),
    url("assets/letter-bg.jpg") center/cover;
  box-shadow:0 50px 100px -40px rgba(80,55,25,.5),0 12px 24px -12px rgba(80,55,25,.3);
  padding:48px 44px 40px;text-align:left;
}
.hero-visual .letter-card{padding:38px 40px 34px;box-shadow:0 36px 80px -36px rgba(45,31,17,.58)}
.letter-card::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.4;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.55 0.08' numOctaves='3' seed='9'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
}
.letter-card>*{position:relative;z-index:1}
.letter-brand{position:absolute;z-index:2;right:30px;top:28px;width:94px;height:auto;opacity:.62;filter:sepia(.18) saturate(.85)}
.lc-meta{font-size:12px;letter-spacing:.04em;color:rgba(60,40,18,.6);margin-bottom:18px;font-weight:500;max-width:calc(100% - 118px)}
.lc-text{font-family:var(--kai);font-size:clamp(22px,5vw,28px);line-height:1.85;color:var(--letter-ink);letter-spacing:.03em}
.lc-sign{font-family:var(--kai);text-align:right;font-size:clamp(19px,4vw,23px);color:#7a2b1c;margin-top:22px}

/* ---------- sections ---------- */
section{padding:96px 0}
.eyebrow{font-size:13px;font-weight:500;color:var(--kraft-3);letter-spacing:.02em;margin-bottom:12px;text-align:center}
.title{font-size:clamp(30px,5vw,52px);font-weight:700;letter-spacing:-.03em;line-height:1.08;text-align:center}
.lead{font-size:clamp(16px,2.2vw,20px);color:var(--ink-2);font-weight:300;text-align:center;max-width:34ch;margin:16px auto 0;line-height:1.5}
.section-head{margin-bottom:56px}

/* ---------- studio ---------- */
.letter-scene{
  position:relative;max-width:760px;margin:-20px auto 42px;border-radius:var(--r-lg);overflow:hidden;
  aspect-ratio:16/7;background:#f5f0e9;border:1px solid var(--line);
  box-shadow:0 24px 70px -54px rgba(0,0,0,.4);
}
.letter-scene img{width:100%;height:100%;object-fit:cover;object-position:68% 50%}
.letter-scene::after{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:
    linear-gradient(180deg,rgba(36,25,14,0) 38%,rgba(36,25,14,.58)),
    linear-gradient(90deg,rgba(251,251,253,.12),rgba(251,251,253,0) 42%,rgba(42,29,16,.12));
}
.letter-scene figcaption{
  position:absolute;left:24px;bottom:20px;z-index:2;
  max-width:26ch;font-family:var(--serif);font-size:16px;line-height:1.75;color:#fff;
  padding:8px 12px;border-radius:12px;background:rgba(42,29,16,.62);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  text-shadow:0 2px 18px rgba(36,25,14,.45);
}
.studio{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  overflow:hidden;display:grid;grid-template-columns:1fr 1fr;box-shadow:0 1px 3px rgba(0,0,0,.04);
}
@media(max-width:760px){.studio{grid-template-columns:1fr}}
.studio-form{padding:44px 40px}
@media(max-width:760px){.studio-form{padding:34px 24px;border-bottom:1px solid var(--line)}}
.form-h{font-size:21px;font-weight:600;letter-spacing:-.02em;margin-bottom:4px}
.form-sub{font-size:14px;color:var(--ink-2);margin-bottom:30px;font-weight:300}

.field{margin-bottom:24px}
.field label{display:block;font-size:12px;font-weight:500;color:var(--ink-2);margin-bottom:9px}
.field input,.field textarea{
  width:100%;font-family:var(--sans);font-size:15px;color:var(--ink);font-weight:400;
  background:var(--bg);border:1px solid transparent;border-radius:12px;padding:12px 14px;
  transition:border-color .25s var(--ease),background .25s var(--ease);
}
.field input::placeholder,.field textarea::placeholder{color:var(--ink-3)}
.field input:focus,.field textarea:focus{outline:none;background:#fff;border-color:var(--ink-3)}
.field textarea{resize:none;min-height:72px;line-height:1.6}

.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  font-size:13px;font-weight:400;padding:8px 16px;border-radius:980px;cursor:pointer;
  color:var(--ink-2);background:var(--bg);border:1px solid transparent;user-select:none;
  transition:all .22s var(--ease);
}
.chip:hover{color:var(--ink)}
.chip.on{background:var(--ink);color:#fff}
.gen{width:100%;margin-top:6px;padding:13px}

/* preview */
.studio-preview{padding:44px 40px;background:linear-gradient(180deg,#fafafa,#f4f4f5);display:flex;flex-direction:column}
@media(max-width:760px){.studio-preview{padding:34px 24px}}
.preview-letter{
  flex:1;position:relative;border-radius:var(--r);overflow:hidden;min-height:360px;padding:40px 34px;
  background:
    linear-gradient(150deg,rgba(217,193,160,.78),rgba(199,168,127,.72) 55%,rgba(184,148,106,.78)),
    url("assets/letter-bg.jpg") center/cover;
  box-shadow:0 30px 60px -30px rgba(80,55,25,.5),inset 0 0 80px rgba(90,58,22,.18);
}
.preview-letter::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.4;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='m'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.55 0.08' numOctaves='3' seed='4'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23m)' opacity='0.5'/%3E%3C/svg%3E");
}
.preview-letter>*{position:relative;z-index:1}
.preview-letter .letter-brand{position:absolute;z-index:2;right:26px;top:24px;width:90px}
.pl-meta{font-size:12px;letter-spacing:.04em;color:rgba(60,40,18,.55);margin-bottom:16px;font-weight:500;max-width:calc(100% - 112px)}
.pl-body{font-family:var(--kai);font-size:clamp(20px,2.4vw,25px);line-height:1.95;color:var(--letter-ink);white-space:pre-wrap;letter-spacing:.03em;min-height:180px}
.pl-body .ph{font-family:var(--sans);font-size:14px;font-weight:300;color:rgba(60,40,18,.5);letter-spacing:0;line-height:1.6}
.pl-sign{font-family:var(--kai);text-align:right;font-size:clamp(18px,2vw,22px);color:#7a2b1c;margin-top:20px}
.typing{border-right:2px solid rgba(122,43,28,.8);animation:caret .85s step-end infinite}
@keyframes caret{50%{border-color:transparent}}

.share{margin-top:24px}
.share-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.sbtn{
  font-family:var(--sans);font-size:14px;font-weight:400;padding:12px 14px;border-radius:12px;
  border:1px solid var(--line);background:#fff;color:var(--ink);cursor:pointer;text-decoration:none;
  display:flex;align-items:center;justify-content:center;gap:7px;
  transition:transform .22s var(--ease),background .22s var(--ease),border-color .22s var(--ease);
}
.sbtn:hover{transform:translateY(-1px);border-color:var(--ink-3)}
.sbtn:disabled{opacity:.55;cursor:wait;transform:none}
.sbtn[hidden]{display:none}
.sbtn svg{width:16px;height:16px;flex:none}
.sbtn.primary{background:var(--ink);color:#fff;border-color:var(--ink)}
.sbtn.primary:hover{background:#000}
.share-note{font-size:12px;color:var(--ink-3);margin-top:14px;text-align:center;line-height:1.5;font-weight:300}

/* ---------- photo preview ---------- */
.photo-sheet{
  position:fixed;inset:0;z-index:90;display:flex;align-items:center;justify-content:center;
  padding:24px;background:rgba(29,29,31,.72);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  opacity:0;pointer-events:none;transition:opacity .24s var(--ease);
}
.photo-sheet[hidden]{display:none}
.photo-sheet.show{opacity:1;pointer-events:auto}
.photo-panel{
  width:min(420px,100%);max-height:calc(100dvh - 48px);overflow:auto;
  background:#fff;border:1px solid rgba(255,255,255,.28);border-radius:18px;padding:14px;
  box-shadow:0 34px 90px -42px rgba(0,0,0,.58);
}
.photo-head{padding:6px 4px 12px}
.photo-title{font-size:18px;font-weight:600;letter-spacing:-.02em;color:var(--ink)}
.photo-hint{font-size:13px;font-weight:300;line-height:1.6;color:var(--ink-2);margin-top:5px}
#photoPreview{
  width:100%;height:min(44dvh,430px);object-fit:contain;border-radius:12px;
  border:1px solid var(--line);background:#f4f4f5;
}
.photo-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}
.photo-actions .sbtn{flex:1}
.photo-actions .wide{grid-column:1/-1}
.sbtn.instagram{border:none;color:#fff;background:linear-gradient(135deg,#f58529,#dd2a7b 52%,#515bd4)}
.sbtn.instagram:hover{border:none;background:linear-gradient(135deg,#f77737,#d62976 52%,#4656ce)}
.sbtn.facebook{border:none;color:#fff;background:#1877f2}
.sbtn.facebook:hover{border:none;background:#0f6bdf}
.sbtn.wechat{border:none;color:#fff;background:#07c160}
.sbtn.wechat:hover{border:none;background:#06ad56}
#photoPreview[hidden],.wechat-qr[hidden]{display:none}
.wechat-qr{
  width:190px;height:190px;object-fit:contain;margin:0 auto 12px;padding:12px;
  background:#fff;border-radius:12px;border:1px solid var(--line);
}

/* ---------- golden lines ---------- */
.quotes{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
@media(max-width:760px){.quotes{grid-template-columns:1fr}}
.q{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease);
}
.q:hover{transform:translateY(-4px);box-shadow:0 24px 48px -28px rgba(0,0,0,.18)}
.q-photo{aspect-ratio:4/3;background:#f1ede8;border-bottom:1px solid var(--line-2);overflow:hidden}
.q-photo img{width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease)}
.q:nth-child(1) .q-photo img{object-position:center 58%}
.q:nth-child(2) .q-photo img{object-position:center 52%}
.q:nth-child(3) .q-photo img{object-position:center 48%}
.q:hover .q-photo img{transform:scale(1.035)}
.q-copy{padding:28px 28px 30px}
.q p{font-family:var(--serif);font-size:18px;line-height:1.85;color:var(--ink);font-weight:400}
.q .by{font-size:12px;color:var(--ink-3);margin-top:18px;font-weight:500;letter-spacing:.02em}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:48px 0;color:var(--ink-2)}
.foot{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:18px}
.foot .logo{color:var(--ink)}
.foot .logo img{width:142px}
.foot .tag{font-size:13px;color:var(--ink-3);font-weight:300}

/* ---------- toast ---------- */
.toast{
  position:fixed;bottom:28px;left:50%;transform:translateX(-50%) translateY(120px);
  background:rgba(29,29,31,.92);backdrop-filter:blur(20px);color:#fff;
  padding:13px 22px;border-radius:14px;font-size:14px;font-weight:400;z-index:99;
  transition:transform .5s var(--ease);box-shadow:0 20px 50px -20px rgba(0,0,0,.5);
}
.toast.show{transform:translateX(-50%) translateY(0)}

@media(max-width:600px){
  .wrap{padding:0 20px}
  section{padding:72px 0}
	  .hero{padding:120px 0 64px}
	  .section-head{margin-bottom:40px}
	  .hero-visual{margin-top:48px}
	  .hero-photo{aspect-ratio:4/5}
	  .photo-caption{display:none}
	  .hero-letter{margin-top:48px}
	  .hero-visual .hero-letter{bottom:22px;width:calc(100% - 32px)}
	  .letter-card{padding:38px 30px}
	  .hero-visual .letter-card{padding:30px 26px 28px}
	  .letter-brand{right:22px;top:22px;width:82px}
	  .preview-letter .letter-brand{right:22px;top:20px;width:78px}
	  .letter-scene{margin:-8px auto 32px;aspect-ratio:4/3}
	  .letter-scene figcaption{left:20px;right:20px;bottom:18px;font-size:15px}
	  .q-copy{padding:26px 24px 28px}
	  .foot{flex-direction:column;text-align:center}
  .toast{left:20px;right:20px;transform:translateY(120px);text-align:center}
  .toast.show{transform:translateY(0)}
}