/* Thiệp cưới online — stylesheet. Đặc tả: specs/04-design-system.md, specs/06-responsive.md */
:root{
  --paper:#F6F1E7; --paper2:#F1EADC; --ink:#3D4A42; --ink2:#566B5D; --sage:#9AAE9F; --sage-d:#5E7563; --line:#D9D0BE; --muted:#7A867D;
  --gut:max(26px, env(safe-area-inset-left), env(safe-area-inset-right));
  --top:calc(env(safe-area-inset-top, 0px) + 72px);      /* chừa chỗ thanh địa chỉ + nút nhạc */
  --bot:calc(env(safe-area-inset-bottom, 0px) + 44px);   /* chừa chỗ thanh công cụ trình duyệt */
  --serif:'Cormorant Garamond', Georgia, serif; --script:'Pinyon Script', cursive; --sans:'Be Vietnam Pro', system-ui, sans-serif; --hy:'Noto Serif TC', serif;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;overflow:hidden;-webkit-text-size-adjust:100%}
body{background:var(--paper2);color:var(--ink);font-family:var(--serif);-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
button{font:inherit;color:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent}
a{color:inherit;-webkit-tap-highlight-color:transparent}
.cap{font-family:var(--sans);font-weight:500;font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--ink2)}
.script{font-family:var(--script);font-weight:400;line-height:1}
.hy{font-family:var(--hy);line-height:1}

/* ---------- khung + deck cuộn theo trang ---------- */
.frame{position:relative;height:100vh;height:100dvh;height:var(--app-h,100dvh);max-width:480px;margin:0 auto;background:radial-gradient(120% 60% at 50% 40%, #FBF8F1 0%, var(--paper) 70%);overflow:hidden;
  --ft:calc(env(safe-area-inset-top, 0px) + 13px); --fb:calc(env(safe-area-inset-bottom, 0px) + 13px); --fx:13px}
/* viền đôi cố định như thiệp giấy — nằm dưới mọi trang */
.border{position:absolute;z-index:0;pointer-events:none;top:calc(env(safe-area-inset-top, 0px) + 8px);bottom:calc(env(safe-area-inset-bottom, 0px) + 8px);left:8px;right:8px;border:1px solid #C3CFC5}
.border::after{content:"";position:absolute;inset:4px;border:1px solid #9AAE9F;border-radius:14px}
.border svg{position:absolute;left:50%;width:62px;height:14px;margin-left:-31px;z-index:1}
.border .ot{top:-2px}.border .ob{bottom:-2px;transform:scaleY(-1)}
.deck{position:relative;z-index:1;height:100%;overflow-y:auto;overflow-x:hidden;scroll-snap-type:y mandatory;overscroll-behavior:contain;-webkit-overflow-scrolling:touch;scrollbar-width:none}
/* cắt theo mép trong của nét viền trong — nội dung cuộn ra ngoài viền thì mất hẳn */
.deck{-webkit-clip-path:inset(var(--ft) var(--fx) var(--fb) var(--fx) round 13px);clip-path:inset(var(--ft) var(--fx) var(--fb) var(--fx) round 13px)}
.deck::-webkit-scrollbar{display:none}
.pg{position:relative;height:100%;scroll-snap-align:start;scroll-snap-stop:always;overflow:hidden;
  display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;
  padding:var(--top) var(--gut) var(--bot)}
.pg > *{position:relative;z-index:1}
.pg > .fl{position:absolute;z-index:0;pointer-events:none}
.fl.tr{top:var(--ft);right:var(--fx)} .fl.tl{top:var(--ft);left:var(--fx)}
.fl.bl{bottom:var(--fb);left:var(--fx)} .fl.br{bottom:var(--fb);right:var(--fx)}
.fl.top.lg{width:50%} .fl.bot.lg{width:42%}
.fl.top.md{width:38%} .fl.bot.md{width:32%}
.fl.top.sm{width:28%} .fl.bot.sm{width:22%}
.fl.lg{--o:.95} .fl.md{--o:.9} .fl.sm{--o:.85}

/* hiệu ứng vào trang: trượt lên có quán tính, so le từng phần tử */
.rv{opacity:0;transform:translateY(28px);transition:opacity .7s ease, transform .9s cubic-bezier(.16,1,.3,1);transition-delay:calc(var(--d,0) * 90ms)}
.pg.on .rv{opacity:1;transform:none}
.fl{opacity:0;transform:scale(1.06);transition:opacity 1.4s ease, transform 2.2s cubic-bezier(.16,1,.3,1)}
.fl.tr{transform-origin:top right}.fl.bl{transform-origin:bottom left}.fl.tl{transform-origin:top center}.fl.br{transform-origin:bottom center}
.fl.tl,.fl.br{transform:scaleX(-1) scale(1.06)}
.pg.on .fl{opacity:var(--o,1);transform:none}
.pg.on .fl.tl,.pg.on .fl.br{transform:scaleX(-1)}

/* chỉ số trang */
.dots{position:absolute;right:max(20px, env(safe-area-inset-right));top:50%;transform:translateY(-50%);z-index:20;display:flex;flex-direction:column;gap:10px;opacity:0;transition:opacity .6s}
.dots.vis{opacity:1}
.dots button{width:14px;height:14px;padding:0;border:0;background:transparent;display:grid;place-items:center}
.dots button::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--sage);opacity:.5;transition:all .4s cubic-bezier(.16,1,.3,1)}
.dots button.on::before{height:16px;border-radius:3px;background:var(--sage-d);opacity:1}

/* nút nhạc */
.music{position:absolute;top:calc(env(safe-area-inset-top, 0px) + 22px);right:calc(var(--gut) + 6px);z-index:25;display:flex;gap:6px}
.disc{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:rgba(246,241,231,.82);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);display:grid;place-items:center;padding:0}
.disc svg{width:17px;height:17px}
.disc.playing svg{animation:spin 6s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.tracks{position:absolute;top:calc(env(safe-area-inset-top, 0px) + 66px);right:calc(var(--gut) + 6px);z-index:26;background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:6px;min-width:228px;box-shadow:0 18px 40px -20px rgba(61,74,66,.45);display:none;text-align:left}
.tracks.open{display:block}
.tracks button{display:flex;width:100%;border:0;background:transparent;padding:10px 12px;border-radius:9px;gap:10px;align-items:baseline;font-family:var(--sans);font-size:13px;color:var(--ink)}
.tracks button small{color:var(--muted);font-size:11px}
.tracks button.on{background:var(--paper2);color:var(--sage-d)}

/* ---------- phong bì mở đầu ---------- */
.intro{position:fixed;inset:0;z-index:50;background:var(--paper2);display:flex;align-items:center;justify-content:center;padding:var(--top) var(--gut) var(--bot);transition:opacity 1s ease .6s, visibility 0s linear 1.6s}
.intro.gone{opacity:0;visibility:hidden}
.intro-stack{display:flex;flex-direction:column;align-items:center}
.env{position:relative;width:min(84vw,360px,calc((100dvh - 260px) * .724));aspect-ratio:5.25/7.25;perspective:1400px}
.env-body{position:absolute;inset:0;background:#F3EDE1;border-radius:6px;box-shadow:0 30px 60px -30px rgba(61,74,66,.5), inset 0 0 0 1px #E3D9C6;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;padding:0 18px 12%}
.env-flap{position:absolute;left:0;right:0;top:0;height:46%;transform-origin:top center;transition:transform 1.1s cubic-bezier(.6,.05,.3,1);z-index:3;filter:drop-shadow(0 3px 4px rgba(91,78,58,.16))}
.env-flap svg{width:100%;height:100%;display:block}
.intro.open .env-flap{transform:rotateX(180deg)}
.seal{position:absolute;left:50%;top:44%;transform:translate(-50%,-50%);width:60px;height:60px;border-radius:50%;border:1px solid var(--sage);display:grid;place-items:center;z-index:4;background:#F4EEE3;transition:opacity .4s}
.seal span{width:50px;height:50px;border-radius:50%;border:1px solid var(--sage);display:grid;place-items:center;font-size:26px;color:#6E8873}
.intro.open .seal{opacity:0}
.env-names{font-size:clamp(32px,10vw,46px);text-align:center;line-height:1.15;white-space:nowrap}
.env-names .amp,.cover .amp{font-family:var(--serif);font-style:italic;font-size:.5em;color:var(--sage-d);margin:0 .2em}
.env-to{margin-top:10px;font-style:italic;font-size:17px;color:var(--ink2)}
.env-guest{font-size:20px;font-weight:600;margin-top:2px}
.open-btn{margin-top:26px;border:0;background:var(--sage-d);color:#fff;border-radius:999px;padding:13px 30px;font-family:var(--sans);font-size:12px;letter-spacing:.2em;font-weight:500;box-shadow:0 10px 24px -12px rgba(61,74,66,.7)}
.open-btn:active{transform:scale(.97)}
.intro-hint{margin-top:12px;font-family:var(--sans);font-size:11px;color:var(--muted)}

/* ---------- 1 · bìa ---------- */
.cover{justify-content:space-between}
.seg{position:absolute;top:calc(env(safe-area-inset-top, 0px) + 22px);left:calc(var(--gut) + 6px);z-index:3;display:flex;background:rgba(246,241,231,.82);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--line);border-radius:999px;padding:3px}
.seg button{border:0;background:transparent;font-family:var(--sans);font-size:12px;font-weight:500;letter-spacing:.04em;padding:8px 14px;border-radius:999px;color:var(--ink2);transition:background .3s,color .3s}
.seg button[aria-pressed="true"]{background:var(--sage-d);color:#fff}
.cover .ill{flex:1 1 auto;min-height:0;width:100%;display:flex;align-items:flex-end;justify-content:center}
.cover .ill img{height:100%;width:auto;max-width:92%;object-fit:contain;object-position:bottom}
.cover .txt{flex:0 0 auto;padding-top:2px}
.cover .kind{margin-bottom:6px}
.cover h1{margin:0;font-size:clamp(42px,12.5vw,58px);font-weight:400;line-height:1.08}
.cover h1 .amp{display:block;font-size:.42em;margin:2px 0}
.cover .date{margin-top:10px;font-size:22px;font-weight:500;letter-spacing:.14em}
.next{margin-top:4px;border:0;background:transparent;padding:6px;color:var(--sage-d);animation:bob 2.4s ease-in-out infinite}
.next svg{width:22px;height:22px;display:block}
@keyframes bob{0%,100%{transform:translateY(0);opacity:.55}50%{transform:translateY(6px);opacity:1}}

/* ---------- 2 · báo hỷ ---------- */
.medal{width:50px;height:50px;border-radius:50%;border:1px solid var(--sage);display:grid;place-items:center;flex:0 0 auto}
.medal span{width:42px;height:42px;border-radius:50%;border:1px solid var(--sage);display:grid;place-items:center;font-size:22px;color:#6E8873}
.parents{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:10px;width:100%;max-width:380px}
.parents .cap{font-size:10px}
.parents .nm{margin-top:6px;font-size:17px;font-weight:600;line-height:1.25;text-wrap:balance}
.lead{margin-top:clamp(10px,2.6svh,28px);font-size:18px;font-style:italic;color:var(--ink2);line-height:1.35}
.lead b{display:block;font-style:normal;font-weight:600;font-size:clamp(22px,6.6vw,26px);color:var(--ink);letter-spacing:.03em}
.couple{margin-top:clamp(8px,2.2svh,22px);display:grid;gap:8px}
.couple .cap{font-size:10px}
.couple .nm{font-size:clamp(21px,6.4vw,28px);font-weight:600;letter-spacing:.05em;margin-top:2px;text-wrap:balance}
.couple .and{font-family:var(--script);font-size:34px;color:var(--sage-d);line-height:.7}

/* ---------- 3 · album ---------- */
.album{padding-left:0;padding-right:0}
.pg h2{margin:0;font-family:var(--script);font-weight:400;font-size:clamp(38px,11vw,50px);line-height:1.1;color:var(--ink)}
.show{position:relative;flex:1 1 auto;min-height:0;width:calc(100% - 2 * var(--gut));margin-top:14px;border-radius:6px;overflow:hidden;background:#E8E0CF;box-shadow:0 26px 50px -30px rgba(61,74,66,.6);touch-action:pan-y;user-select:none;-webkit-user-select:none}
.slide{position:absolute;inset:0;opacity:0;transition:opacity .7s ease}
.slide.on{opacity:1}
.slide .bg{position:absolute;inset:-40px;background-size:100% 100%;filter:blur(24px) saturate(1.1)}  /* kéo giãn: dải trên/dưới lấy màu mép trên/dưới của ảnh */
.slide img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.slide.land img{object-fit:contain}
.slide.on img{animation:kb 5s ease-out both}
@keyframes kb{from{transform:scale(1.07)}to{transform:scale(1)}}
.ctrl{margin-top:14px;display:flex;align-items:center;gap:18px;font-family:var(--sans);font-size:12px;letter-spacing:.14em;color:var(--ink2)}
.ctrl button{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:transparent;display:grid;place-items:center;padding:0;color:var(--ink)}
.ctrl svg{width:15px;height:15px}
.bar{width:120px;height:2px;background:var(--line);border-radius:2px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--sage-d);transition:width .5s cubic-bezier(.16,1,.3,1)}

.sched{margin-top:clamp(10px,2.4svh,24px);padding-top:clamp(10px,2.2svh,18px);border-top:1px solid var(--line);width:100%;max-width:340px}
.sched .day{font-size:21px;font-weight:600;letter-spacing:.04em}
.sched .lunar{margin-top:2px;font-size:15px;font-style:italic;color:var(--muted)}
.sched .cols{margin-top:clamp(10px,2.2svh,16px);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}
.sched .cap{font-size:10px}
.sched .t{margin-top:4px;font-size:clamp(30px,9vw,38px);font-weight:500;line-height:1}
.sched .w{margin-top:4px;font-size:15px;font-style:italic;color:var(--ink2)}
.sched .rule{width:1px;height:52px;background:var(--line)}
.cd{margin-top:clamp(12px,2.4svh,20px);font-family:var(--sans);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.cd b{font-family:var(--serif);font-size:20px;font-weight:600;letter-spacing:0;color:var(--ink);margin:0 1px 0 4px;font-variant-numeric:tabular-nums}
.btn{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-family:var(--sans);font-size:12px;font-weight:500;letter-spacing:.1em;border-radius:999px;padding:11px 20px;border:1px solid var(--sage-d);color:var(--sage-d);background:transparent;margin-top:clamp(14px,3svh,22px)}
.btn.fill{background:var(--sage-d);color:#fff}
.btn svg{width:15px;height:15px}

/* ---------- 5 · địa điểm ---------- */
.place .vn{margin-top:6px;font-size:clamp(24px,7vw,30px);font-weight:600;letter-spacing:.05em}
.place .ad{margin-top:6px;font-family:var(--sans);font-size:13px;line-height:1.5;color:var(--ink2);max-width:300px}
.mapbox{position:relative;flex:1 1 auto;min-height:0;width:100%;margin-top:12px;display:flex;align-items:center;justify-content:center}
.mapbox .m{max-height:100%;width:auto;max-width:100%;aspect-ratio:420/392}
.mapbox .qr{display:none}
@media (hover:hover) and (pointer:fine){
  .mapbox .qr{display:flex;position:absolute;right:4%;top:8%;width:22%;flex-direction:column;align-items:center;gap:4px}
  .mapbox .qr span{font-family:var(--sans);font-size:8px;letter-spacing:.06em;color:#6B7D70;white-space:nowrap}
}

/* ---------- 6 · cảm ơn ---------- */
.thanks .ill{flex:0 1 auto;min-height:0;max-height:40svh;display:flex;justify-content:center;margin-top:10px}
.thanks .ill img{height:100%;max-height:40svh;width:auto;object-fit:contain}
.thanks p{margin:16px auto 0;max-width:320px;font-size:18px;font-style:italic;line-height:1.5;color:var(--ink2)}
.thanks .sig{margin-top:10px;font-size:clamp(28px,8.2vw,36px);line-height:1.2;max-width:100%}

/* ---------- màn hình lớn: nền ảnh mờ ---------- */
.backdrop{display:none}
@media (min-width:700px){
  .backdrop{display:block;position:fixed;inset:-40px;background-position:center;background-size:cover;filter:blur(28px) saturate(.75) brightness(1.08)}
  .backdrop::after{content:"";position:absolute;inset:0;background:rgba(241,234,220,.72)}
  .frame{box-shadow:0 0 0 1px #E6DECD, 0 40px 120px -30px rgba(61,74,66,.45)}
  .intro{background:rgba(241,234,220,.94)}
}
/* màn hình rất thấp (điện thoại xoay ngang, máy cũ) */
@media (max-height:600px){
  :root{--top:calc(env(safe-area-inset-top, 0px) + 56px);--bot:calc(env(safe-area-inset-bottom, 0px) + 36px)}
  .couple{gap:2px}
  .couple .and{font-size:26px}
  .sched .lunar{display:none}
  .invite .cd{display:none}
  .invite .btn{margin-top:10px}
  .parents .nm{font-size:15px;margin-top:3px}
  .medal{width:42px;height:42px}
  .medal span{width:35px;height:35px;font-size:18px}
  .lead{font-size:16px}
  .lead b{font-size:21px}
  .sched .day{font-size:19px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition-duration:.01s!important}
}