/* ---------- core (shared across every theme — colors come from :root vars only) ---------- */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Noto Serif Thai',serif;background:var(--bg);color:var(--ink);overflow-x:hidden}
#petals{position:fixed;inset:0;z-index:0;pointer-events:none}
.hero{position:relative;z-index:1;min-height:100svh;display:flex;flex-direction:column;
  justify-content:center;align-items:center;text-align:center;padding:2rem 1rem}
.crest{width:150px;height:150px;border-radius:50%;object-fit:cover;display:block;margin:0 auto 1rem;
  box-shadow:0 10px 28px rgba(var(--rose-rgb),.28);animation:fadeUp 1.2s 0s both}
.pre{letter-spacing:.5em;font-size:.8rem;color:var(--gold);text-transform:uppercase;animation:fadeUp 1.2s .2s both}
h1{font-family:'Playfair Display','Noto Serif Thai',serif;font-size:clamp(3rem,10vw,6rem);
  font-weight:500;line-height:1.15;margin:.5rem 0;animation:fadeUp 1.2s .5s both}
.amp{color:var(--rose);font-style:italic}
.hero .names{font-size:.95rem;opacity:.75;letter-spacing:.05em;margin-bottom:.4rem;animation:fadeUp 1.2s .65s both}
.hero .date{font-size:1.15rem;letter-spacing:.15em;animation:fadeUp 1.2s .8s both}
#countdown{display:flex;gap:1.2rem;margin:2rem 0;animation:fadeUp 1.2s 1.1s both}
#countdown div{min-width:64px}
#countdown b{display:block;font-size:2rem;font-family:'Playfair Display',serif;color:var(--rose-d)}
#countdown span{font-size:.75rem;opacity:.7}
.btn{display:inline-block;background:var(--rose);color:#fff;text-decoration:none;
  padding:.85rem 2rem;border-radius:999px;font-size:1.05rem;border:none;cursor:pointer;
  box-shadow:0 6px 20px rgba(var(--rose-rgb),.35);transition:transform .2s,box-shadow .2s;font-family:inherit}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(var(--rose-rgb),.45)}
.btn.ghost{background:transparent;color:var(--rose-d);border:1.5px solid var(--rose);box-shadow:none}
.hero .btn{animation:fadeUp 1.2s 1.4s both}
.scroll-hint{position:absolute;bottom:1.5rem;font-size:.85rem;opacity:.55;animation:bob 2s infinite}
@keyframes fadeUp{from{opacity:0;transform:translateY(28px)}to{opacity:1;transform:none}}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(8px)}}
section{position:relative;z-index:1;max-width:760px;margin:0 auto;padding:5rem 1.25rem}
.reveal{opacity:0;transform:translateY(30px);transition:opacity .9s ease,transform .9s ease}
.reveal.in{opacity:1;transform:none}
h2{font-family:'Playfair Display','Noto Serif Thai',serif;font-size:2rem;text-align:center;margin-bottom:.4rem}
.sub{text-align:center;color:var(--gold);letter-spacing:.3em;font-size:.75rem;text-transform:uppercase;margin-bottom:2.5rem}
.sub a{color:inherit;text-decoration:underline;text-decoration-color:rgba(0,0,0,.25)}
.timeline{border-left:2px solid var(--border);margin-left:.5rem;padding-left:1.75rem;display:grid;gap:1.75rem}
.timeline li{list-style:none;position:relative}
.timeline li::before{content:'';position:absolute;left:-2.32rem;top:.4rem;width:12px;height:12px;
  border-radius:50%;background:var(--rose);box-shadow:0 0 0 4px rgba(var(--rose-rgb),.2)}
.timeline b{color:var(--rose-d)}
.cards{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.card{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:1.5rem;text-align:center;
  box-shadow:0 4px 18px rgba(var(--ink-rgb),.06)}
.card .emo{font-size:1.8rem}
.card h3{margin:.4rem 0 .2rem;font-size:1.05rem}
.card p{font-size:.92rem;opacity:.85}
.center{text-align:center;margin-top:2rem;display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap}
/* ---------- AI song studio ---------- */
#play .stage,#guestbook .stage{background:linear-gradient(160deg,rgba(var(--rose-rgb),.05),rgba(var(--rose-rgb),.1));
  border:1px solid var(--border);border-radius:24px;padding:2rem 1.25rem;
  box-shadow:0 10px 34px rgba(var(--rose-rgb),.12);max-width:480px;margin:0 auto}
.ai-note{font-size:.85rem;opacity:.75;text-align:center;margin-bottom:1.2rem;line-height:1.6}
#play textarea,#play input,#play select,#guestbook textarea,#guestbook input,#guestbook select{
  width:100%;font-family:inherit;font-size:.95rem;color:var(--ink);
  background:#fff;border:1px solid var(--border);border-radius:12px;padding:.7rem .9rem;margin-bottom:.7rem}
#play textarea,#guestbook textarea{resize:vertical}
.ai-row{display:grid;grid-template-columns:1fr 1fr;gap:.6rem}
.ai-row select{margin-bottom:.7rem}
.ai-row input,.ai-row .btn{margin-bottom:.7rem}
#ai-gen,#gb-submit{width:100%;margin-top:.3rem}
#ai-gen:disabled,#gb-submit:disabled{opacity:.5;cursor:not-allowed;transform:none}
.ai-progress-track{width:100%;height:10px;background:var(--border);border-radius:999px;overflow:hidden;margin-top:1rem}
.ai-progress-fill{height:100%;width:0%;background:linear-gradient(90deg,var(--rose),var(--gold));
  border-radius:999px;transition:width .4s ease}
.ai-progress-pct{text-align:center;font-size:.85rem;color:var(--rose-d);margin-top:.4rem;font-weight:600}
#ai-status{text-align:center;margin-top:.9rem;min-height:1.4em;color:var(--rose-d);font-size:.9rem}
#ai-result{margin-top:1rem}
#ai-result audio{width:100%;border-radius:10px}
#ai-share{width:100%;margin-top:.8rem}

/* ---------- สมุดอวยพร ---------- */
#gb-use-song{width:100%;margin-bottom:.7rem;font-size:.85rem;padding:.6rem 1rem}
#gb-status{text-align:center;margin-top:.6rem;min-height:1.4em;color:var(--rose-d);font-size:.9rem}
#gb-search{margin-bottom:1rem}
#gb-list{display:grid;gap:.8rem;max-height:480px;overflow-y:auto;padding-right:.2rem}
.gb-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:1rem 1.1rem}
.gb-card .gb-name{font-weight:600;color:var(--rose-d);font-size:.95rem}
.gb-card .gb-msg{font-size:.92rem;margin-top:.2rem;line-height:1.6;white-space:pre-wrap;word-break:break-word}
.gb-card audio{width:100%;margin-top:.6rem;border-radius:10px}
.gb-card .gb-time{font-size:.75rem;opacity:.55;margin-top:.5rem}

/* ---------- envelope gate ---------- */
html.gate-lock,html.gate-lock body{overflow:hidden;height:100%}
#gate{position:fixed;inset:0;z-index:50;background:linear-gradient(160deg,var(--bg),var(--border));
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1.6rem;
  transition:opacity .6s ease;padding:2rem}
#gate.closed{opacity:0;pointer-events:none}
#gate .gate-title{font-family:'Playfair Display','Noto Serif Thai',serif;font-size:1.3rem;
  color:var(--rose-d);text-align:center;line-height:1.6}
.envelope{position:relative;width:min(76vw,300px);aspect-ratio:3/2;cursor:pointer;perspective:800px}
.env-body{position:absolute;inset:0;background:var(--card);border:1px solid var(--border);
  border-radius:8px;box-shadow:0 24px 50px rgba(var(--ink-rgb),.28);z-index:1}
.env-letter{position:absolute;left:8%;right:8%;bottom:6%;height:0;background:var(--card);
  border:1px solid var(--border);border-radius:6px;overflow:hidden;z-index:2;
  display:flex;align-items:center;justify-content:center;text-align:center;padding:0 1rem;
  font-size:.8rem;color:var(--ink);line-height:1.6;
  transition:height .6s ease .5s,bottom .6s ease .5s}
.envelope.open .env-letter{height:90%;bottom:32%}
.env-flap{position:absolute;top:0;left:0;width:100%;height:55%;background:var(--rose);
  clip-path:polygon(0 0,100% 0,50% 100%);transform-origin:top center;
  transition:transform .8s cubic-bezier(.6,-.3,.4,1.4);z-index:3}
.envelope.open .env-flap{transform:rotateX(180deg)}
.env-seal{position:absolute;top:40%;left:50%;transform:translate(-50%,-50%);z-index:4;
  width:46px;height:46px;background:var(--gold);border-radius:50%;display:flex;align-items:center;
  justify-content:center;font-size:1.4rem;box-shadow:0 4px 10px rgba(0,0,0,.2);
  transition:opacity .3s,transform .3s}
.envelope.open .env-seal{opacity:0;transform:translate(-50%,-50%) scale(.3)}
.gate-hint{font-size:.85rem;opacity:.6;letter-spacing:.05em}
#gift-banner{position:fixed;left:50%;bottom:1.2rem;transform:translateX(-50%);z-index:10;
  background:var(--card);border:1px solid var(--border);border-radius:999px;padding:.6rem .7rem .6rem 1.2rem;
  display:none;align-items:center;gap:.8rem;box-shadow:0 10px 30px rgba(var(--rose-rgb),.25);white-space:nowrap}
footer{position:relative;z-index:1;text-align:center;padding:3rem 1rem;font-size:.9rem;opacity:.7}