/* =============================================================
   ALBUM SINH NHẬT — style.css
   Bố cục: 4 màn (intro → trình chiếu → collage → lời chúc)
   ============================================================= */

:root{
  --bg:#0b0810;
  --bg-glow:#2a1538;
  --gold:#e9c46a;
  --gold-2:#f6dc9a;
  --rose:#f2a7bb;
  --red:#e63946;
  --cream:#fff7ea;
  --ink:#2a1b2e;
  --text:#f7eef5;
  --muted:rgba(247,238,245,.62);
  --font-display:'Playfair Display',Georgia,'Times New Roman',serif;
  --font-hand:'Dancing Script','Segoe Script','Brush Script MT',cursive;
  --font-body:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
html{background:var(--bg)}
body{
  font-family:var(--font-body);color:var(--text);
  background:radial-gradient(1200px 800px at 75% 15%,var(--bg-glow) 0%,var(--bg) 60%);
  overflow:hidden;-webkit-font-smoothing:antialiased;
}
img{user-select:none;-webkit-user-drag:none}
button{font:inherit;color:inherit}

.bg-canvas,.confetti-canvas{position:fixed;inset:0;width:100%;height:100%;pointer-events:none}
.bg-canvas{z-index:0;transition:opacity .8s}
.confetti-canvas{z-index:50}
body[data-stage="show"] .bg-canvas,body[data-stage="wall"] .bg-canvas{opacity:.45}

/* ---------- Stage (màn) ---------- */
.stage{
  position:fixed;inset:0;z-index:1;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  opacity:0;visibility:hidden;transform:translateY(14px);
  transition:opacity .8s var(--ease),transform .8s var(--ease),visibility 0s .8s;
  overflow:hidden;
}
.stage.is-active{
  opacity:1;visibility:visible;transform:none;
  transition:opacity .8s var(--ease),transform .8s var(--ease),visibility 0s;
}

/* ---------- Buttons ---------- */
.btn{
  font:500 1rem var(--font-body);padding:.9rem 1.6rem;border-radius:999px;
  border:1px solid transparent;cursor:pointer;display:inline-flex;align-items:center;gap:.5rem;
  transition:transform .25s var(--ease),box-shadow .25s,background .25s,opacity .25s;
}
.btn:disabled{cursor:default;opacity:.85}
.btn--primary{background:linear-gradient(135deg,var(--gold-2),#d4a24c);color:var(--ink);box-shadow:0 10px 30px -10px rgba(233,196,106,.6)}
.btn--primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 16px 36px -12px rgba(233,196,106,.85)}
.btn--ghost{background:rgba(255,255,255,.06);color:var(--text);border-color:rgba(255,255,255,.18);backdrop-filter:blur(8px)}
.btn--ghost:hover{background:rgba(255,255,255,.13)}
.ctrl{
  width:2.6rem;height:2.6rem;border-radius:50%;border:none;background:rgba(255,255,255,.08);
  color:var(--text);font-size:1.25rem;line-height:1;cursor:pointer;display:grid;place-items:center;
  transition:background .2s,transform .2s;
}
.ctrl:hover{background:rgba(255,255,255,.18);transform:scale(1.06)}

@keyframes rise{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

/* =============================================================
   MÀN 1 — INTRO
   ============================================================= */
.intro{text-align:center;padding:2rem 1rem;max-width:720px;animation:rise 1.2s var(--ease) both}
.intro__stack{--sz:180px;position:relative;width:calc(var(--sz) * 1.95);height:calc(var(--sz) * 1.3);margin:0 auto 1.25rem}
.intro__stack .frame{
  position:absolute;left:50%;top:calc(var(--j,0) * 10px);font-size:.7rem;
  margin-left:calc(var(--sz) * -0.56 + var(--k,0) * var(--sz) * 0.27);
  animation:stackIn 1.1s var(--ease) both;animation-delay:var(--delay,0s);
}
.intro__stack .frame__photo img{width:var(--sz);height:var(--sz);object-fit:cover;object-position:center 35%;max-width:none;max-height:none;animation:none}
@keyframes stackIn{from{opacity:0;transform:translateY(30px) rotate(0deg)}to{opacity:1;transform:translateY(0) rotate(var(--tilt))}}
.intro__eyebrow{font-size:.8rem;letter-spacing:.38em;text-transform:uppercase;color:var(--gold);margin-bottom:1.25rem}
.intro__title{font-family:var(--font-display);font-weight:500;font-size:clamp(1.9rem,5vw,3.2rem);line-height:1.15}
.intro__name{
  display:inline-block;font-family:var(--font-hand);font-weight:700;font-style:normal;
  font-size:clamp(3.2rem,9vw,6.4rem);color:var(--rose);margin-top:.15em;
  text-shadow:0 0 40px rgba(242,167,187,.35);
}
.intro__sub{color:var(--muted);margin:1.25rem auto 2.25rem;max-width:480px;line-height:1.7}
.intro__hint{margin-top:1.5rem;font-size:.8rem;color:var(--muted)}

/* =============================================================
   FRAME — các mẫu khung ảnh
   (kích thước dùng em → đổi font-size của .frame là cả khung co giãn)
   ============================================================= */
.frame{
  position:relative;display:inline-block;font-size:1rem;
  transform:rotate(var(--tilt,0deg));
  filter:drop-shadow(0 1.6em 1.6em rgba(0,0,0,.5));
}
.frame__inner{position:relative}
.frame__photo{position:relative;overflow:hidden;background:#0b0710}
.frame__photo img{
  display:block;max-width:min(78vw,700px);max-height:56vh;max-height:56dvh;width:auto;height:auto;
  transform-origin:var(--kb-origin,50% 50%);
  animation:kenburns var(--kb-dur,8s) ease-out both;
}
@keyframes kenburns{from{transform:scale(1)}to{transform:scale(1.12)}}
.frame__caption{
  font-family:var(--font-hand);text-align:center;line-height:1.3;
  width:0;min-width:100%; /* không làm khung rộng hơn ảnh */
}
.frame__caption:empty{display:none}

/* 1. Polaroid */
.frame--polaroid{background:linear-gradient(170deg,#fff,#f6f3ec);padding:.9em .9em 0;border-radius:.15em}
.frame--polaroid .frame__caption{color:#3b2f40;font-size:1.55em;padding:.55em .3em .7em;min-height:2.6em}
.frame--polaroid .frame__caption:empty{display:block}
.frame--polaroid .frame__photo:last-child{margin-bottom:2.2em} /* không có caption vẫn giữ lề dưới dày */

/* 2. Viền trắng (theo mẫu tham khảo) */
.frame--white{background:#fff;padding:.7em;border-radius:.12em}
.frame--white .frame__caption{color:#3b2f40;font-size:1.4em;padding:.45em .3em .1em}

/* 3. Phim 35mm */
.frame--film{background:#141214;padding:2em 1.3em 2.1em;border-radius:.3em}
.frame--film::before,.frame--film::after{
  content:"";position:absolute;left:.9em;right:.9em;height:.8em;border-radius:.1em;opacity:.95;
  background:repeating-linear-gradient(to right,transparent 0 .45em,#efe9dc .45em 1.25em,transparent 1.25em 1.85em);
}
.frame--film::before{top:.55em}
.frame--film::after{bottom:.55em}
.frame--film .frame__photo{border-radius:.1em}
.frame--film .frame__caption{
  font-family:var(--font-body);font-weight:500;font-size:.72em;letter-spacing:.28em;text-transform:uppercase;
  color:var(--gold);text-align:left;padding-top:.7em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}

/* 4. Vintage – giấy kem, băng dính, sepia */
.frame--vintage{
  background:#f1e6cf;
  background-image:radial-gradient(ellipse at 30% 20%,rgba(255,255,255,.6),transparent 60%),
                   radial-gradient(ellipse at 80% 90%,rgba(150,110,60,.25),transparent 55%);
  padding:1.1em 1.1em 1.2em;border-radius:.1em;box-shadow:inset 0 0 2.5em rgba(120,80,30,.18);
}
.frame--vintage .frame__photo img{filter:sepia(.4) contrast(.92) saturate(.8) brightness(1.02)}
.frame--vintage .frame__photo::after{content:"";position:absolute;inset:0;box-shadow:inset 0 0 4em rgba(50,25,0,.5);pointer-events:none}
.frame--vintage .frame__caption{color:#5b4030;font-size:1.4em;padding-top:.55em}
.frame--vintage::before,.frame--vintage::after{
  content:"";position:absolute;top:-.7em;width:6.5em;height:1.7em;
  background:rgba(242,167,187,.78);box-shadow:0 .1em .3em rgba(0,0,0,.18);
}
.frame--vintage::before{left:-1.6em;transform:rotate(-8deg)}
.frame--vintage::after{right:-1.6em;transform:rotate(9deg);background:rgba(233,196,106,.78)}

/* 5. Khung vàng cổ điển */
.frame--gold{
  padding:.85em;border-radius:.25em;
  background:linear-gradient(135deg,#fbe79b 0%,#c9972b 18%,#f7df8f 38%,#9c7114 58%,#f3d87c 78%,#b8862a 100%);
  box-shadow:inset 0 0 0 .14em rgba(255,250,220,.75),inset 0 0 0 .3em rgba(110,75,10,.55),inset 0 0 0 .4em rgba(255,240,190,.5);
}
.frame--gold .frame__inner{background:#fbf5e8;padding:1.4em 1.4em 1em;box-shadow:inset 0 0 0 1px rgba(120,90,30,.25)}
.frame--gold .frame__photo{box-shadow:0 0 0 .18em #c9a24a,0 .2em .6em rgba(0,0,0,.25)}
.frame--gold .frame__caption{font-family:var(--font-display);font-style:italic;color:#6a5330;font-size:1.02em;padding-top:.9em;letter-spacing:.02em}

/* 6. Scrapbook – giấy chấm bi, băng dính, sticker */
.frame--scrapbook{
  background-color:#fff1f4;
  background-image:radial-gradient(rgba(242,167,187,.55) .07em,transparent .12em);
  background-size:1em 1em;padding:1em;border-radius:.45em;border:.12em solid #fff;
}
.frame--scrapbook::before,.frame--scrapbook::after{
  content:"";position:absolute;left:50%;width:5.5em;height:1.5em;
  background:rgba(255,255,255,.6);border:1px dashed rgba(140,60,90,.25);box-shadow:0 .1em .3em rgba(0,0,0,.12);
}
.frame--scrapbook::before{top:-.65em;transform:translateX(-50%) rotate(-2.5deg)}
.frame--scrapbook::after{bottom:-.65em;transform:translateX(-50%) rotate(2.5deg)}
.frame--scrapbook .frame__photo{border-radius:.3em;box-shadow:0 .15em .5em rgba(0,0,0,.2)}
.frame--scrapbook .frame__caption{color:#8a3b55;font-size:1.5em;padding-top:.5em}
.frame__sticker{
  position:absolute;right:-.9em;top:-1.1em;font-size:2.1em;line-height:1;transform:rotate(14deg);
  filter:drop-shadow(0 .15em .25em rgba(0,0,0,.25));pointer-events:none;
}
.frame__sticker--star{animation:stickerBlink 1.7s ease-in-out infinite}
@keyframes stickerBlink{
  0%,100%{transform:rotate(14deg) scale(1);filter:drop-shadow(0 .15em .25em rgba(0,0,0,.25)) brightness(1)}
  38%{transform:rotate(8deg) scale(.82);filter:drop-shadow(0 .1em .2em rgba(0,0,0,.25)) brightness(.75)}
  52%{transform:rotate(18deg) scale(1.2);filter:drop-shadow(0 0 .4em rgba(255,150,180,.95)) brightness(1.5)}
  66%{transform:rotate(14deg) scale(.97);filter:drop-shadow(0 .15em .25em rgba(0,0,0,.25)) brightness(1.1)}
}

/* 7. Minimal – bo góc, caption chồng lên ảnh */
.frame--minimal{padding:0;border-radius:1.25em;overflow:hidden;filter:drop-shadow(0 1.6em 2em rgba(0,0,0,.55))}
.frame--minimal .frame__photo{border-radius:1.25em}
.frame--minimal .frame__inner::after{content:"";position:absolute;inset:0;border-radius:1.25em;box-shadow:inset 0 0 0 1px rgba(255,255,255,.25);pointer-events:none}
.frame--minimal .frame__caption{
  position:absolute;left:0;right:0;bottom:0;width:auto;min-width:0;
  padding:3em 1.3em 1.2em;background:linear-gradient(to top,rgba(10,5,15,.78),rgba(10,5,15,0));
  color:#fff;font-family:var(--font-display);font-style:italic;font-size:1.15em;text-align:left;
  text-shadow:0 1px 8px rgba(0,0,0,.5);
}

/* =============================================================
   MÀN 2 — TRÌNH CHIẾU
   ============================================================= */
.show{position:relative;width:100%;height:100%}
.show__stage{position:absolute;inset:calc(3.8rem + env(safe-area-inset-top,0px)) 0 6.5rem 0;perspective:1200px} /* chừa chỗ cho hàng nút góc trên */
.show__progress{position:absolute;top:0;left:0;right:0;height:3px;background:rgba(255,255,255,.08);z-index:2}
.show__progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--rose),var(--gold))}
.slide{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  opacity:0;pointer-events:none;--dir:1;
}
.slide.is-current{opacity:1;pointer-events:auto;animation:slideIn 1s var(--ease) both}
.slide.is-leaving{animation:slideOut .85s var(--ease) both}
@keyframes slideIn{
  from{opacity:0;transform:translateX(calc(70px * var(--dir))) scale(.9) rotate(calc(3deg * var(--dir)))}
  to{opacity:1;transform:none}
}
@keyframes slideOut{
  from{opacity:1;transform:none}
  to{opacity:0;transform:translateX(calc(-90px * var(--dir))) scale(.9) rotate(calc(-4deg * var(--dir)))}
}
.show__controls{
  position:absolute;left:50%;bottom:calc(1.5rem + env(safe-area-inset-bottom,0px));transform:translateX(-50%);
  display:flex;align-items:center;gap:.5rem;padding:.5rem .6rem;border-radius:999px;
  background:rgba(14,8,18,.6);border:1px solid rgba(255,255,255,.12);backdrop-filter:blur(12px);
  white-space:nowrap;max-width:calc(100vw - 2rem);
}
.show__counter{font-variant-numeric:tabular-nums;color:var(--muted);font-size:.9rem;padding:0 .4rem}
.show__controls .btn{padding:.6rem 1rem;font-size:.9rem}
/* Huy hiệu trái tim – ảnh được đánh dấu */
.fav-badge{
  position:absolute;top:-1em;right:-1em;width:2.6em;height:2.6em;z-index:3;pointer-events:none;
  filter:drop-shadow(0 .15em .35em rgba(0,0,0,.45)) drop-shadow(0 0 .5em rgba(255,92,138,.6));
  animation:badgePop .6s var(--ease) both;
}
.fav-badge svg{display:block;width:100%;height:100%;overflow:visible;animation:starBlink 1.7s ease-in-out .7s infinite}
@keyframes starBlink{
  0%,100%{transform:scale(1);opacity:1;filter:brightness(1)}
  38%{transform:scale(.8) rotate(-6deg);opacity:.5;filter:brightness(.75)}
  52%{transform:scale(1.22) rotate(6deg);opacity:1;filter:brightness(1.6) drop-shadow(0 0 .35em rgba(255,150,180,.95))}
  66%{transform:scale(.96);opacity:.9;filter:brightness(1.1)}
}
.fav-badge__star{fill:#ff5c8a;stroke:#fff0f3;stroke-width:1;stroke-linejoin:round}
@keyframes badgePop{0%{opacity:0;transform:scale(.2) rotate(-30deg)}60%{opacity:1;transform:scale(1.25) rotate(6deg)}100%{opacity:1;transform:scale(1) rotate(0)}}
.slide .fav-badge{width:3.2rem;height:3.2rem;top:-1.2rem;right:-1.2rem}
.poster__photo .fav-badge{width:4.6cqmin;height:4.6cqmin;top:-1.7cqmin;right:-1.7cqmin}


/* =============================================================
   MÀN 3 — COLLAGE (theo mẫu tham khảo)
   ============================================================= */
#stage-wall{justify-content:flex-start;overflow-y:auto;overflow-x:hidden;padding:calc(1.25rem + env(safe-area-inset-top,0px)) 1rem calc(2.5rem + env(safe-area-inset-bottom,0px));-webkit-overflow-scrolling:touch}
.poster{
  --ratio:0.75;
  position:relative;container-type:size;flex:none;
  width:min(100%,calc((100vh - 8.5rem) * var(--ratio)));
  width:min(100%,calc((100dvh - 8.5rem) * var(--ratio)));aspect-ratio:var(--ratio);
  margin:0 auto;background:#050408;border-radius:1rem;overflow:hidden;
  box-shadow:0 40px 80px -30px rgba(0,0,0,.85),inset 0 0 0 1px rgba(255,255,255,.06);
  animation:rise .9s var(--ease) both;
}
.poster::before{ /* ánh sáng nhẹ góc trên */
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(60% 40% at 80% 0%,rgba(120,70,140,.18),transparent 70%);
}
@media (orientation:landscape) and (min-width:760px){.poster{--ratio:1.6}}

/* Lịch */
.poster__cal{position:absolute;left:4.5%;top:4%;width:42%;color:#fff;animation:fadeIn 1s .2s both}
.poster__cal-month{
  font-family:var(--font-display);font-weight:500;text-transform:uppercase;letter-spacing:.06em;
  font-size:5.6cqmin;line-height:1.05;padding-bottom:1.2cqmin;position:relative;
  border-bottom:1px solid rgba(255,255,255,.75);
}
.poster__cal-month::after{content:"";position:absolute;left:0;right:0;bottom:-.7cqmin;border-bottom:1px dotted rgba(255,255,255,.55)}
.poster__cal-grid{
  display:grid;grid-template-columns:repeat(7,1fr);gap:.9cqmin .3cqmin;margin-top:2.6cqmin;
  font-family:var(--font-display);font-size:2.6cqmin;text-align:center;
}
.poster__cal-grid span{display:flex;align-items:center;justify-content:center;aspect-ratio:1;position:relative}
.poster__cal-grid .is-bday{color:#fff;font-weight:700;z-index:1}
.poster__cal-grid .is-bday::before{
  content:"";position:absolute;inset:-28%;z-index:-1;
  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23e63946' d='M12 21.3s-8.2-5-10.4-9.8A6 6 0 0 1 12 5.6a6 6 0 0 1 10.4 5.9C20.2 16.3 12 21.3 12 21.3z'/%3E%3C/svg%3E") center/contain no-repeat;
  filter:drop-shadow(0 0 .8cqmin rgba(230,57,70,.6));
  animation:heartbeat 1.6s ease-in-out infinite;
}
@keyframes heartbeat{0%,100%{transform:scale(1)}14%{transform:scale(1.14)}28%{transform:scale(1)}42%{transform:scale(1.1)}}

/* Ảnh trong collage */
.poster__photos{display:contents}
.poster__photo{
  position:absolute;left:var(--x);top:var(--y);width:var(--w);
  animation:dropIn .9s var(--ease) both;animation-delay:var(--delay,0s);
}
.poster__photo .frame{
  display:block;font-size:1cqmin;transform:rotate(var(--r,0deg));filter:none;cursor:pointer;
  box-shadow:0 1.6cqmin 2.4cqmin rgba(0,0,0,.75);
  transition:transform .45s var(--ease),box-shadow .45s var(--ease);
}
.poster__photo:hover,.poster__photo:focus-within{z-index:9}
.poster__photo:hover .frame,.poster__photo .frame:focus-visible{transform:rotate(0deg) scale(1.07);box-shadow:0 3cqmin 4cqmin rgba(0,0,0,.85);outline:none}
.poster__photo .frame__photo img{width:100%;height:auto;max-width:none;max-height:none;animation:none}
/* Ảnh quá cao (>1.45) hoặc quá ngang (<0.6) trong collage: cắt về khung chuẩn, ưu tiên phần trên (mặt) */
.poster__photo .frame.is-tall .frame__photo{aspect-ratio:3/4}
.poster__photo .frame.is-wide .frame__photo{aspect-ratio:16/10}
.poster__photo .frame.is-tall .frame__photo img,.poster__photo .frame.is-wide .frame__photo img{width:100%;height:100%;object-fit:cover;object-position:center 30%}
@keyframes dropIn{from{opacity:0;transform:translateY(-4cqmin)}to{opacity:1;transform:none}}

/* Trang trí: bướm & sao */
.poster__deco{position:absolute;left:var(--x);top:var(--y);width:var(--s);pointer-events:none;animation:floaty var(--dur,6s) ease-in-out infinite;animation-delay:var(--delay,0s)}
.poster__deco svg{display:block;width:100%;height:auto;overflow:visible;transform:rotate(var(--r,0deg))}
.bf__wing{fill:var(--c);transform-box:fill-box;animation:flap var(--flap,1.1s) ease-in-out infinite alternate}
.bf__wing--l{transform-origin:right center}
.bf__wing--r{transform-origin:left center;animation-delay:.05s}
.bf__vein{fill:none;stroke:rgba(255,255,255,.55);stroke-width:1.2}
.bf__body{stroke:#1f1b24;stroke-width:4;stroke-linecap:round}
@keyframes flap{to{transform:scaleX(.45)}}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-1.2cqmin)}}
.star{fill:#c9a44a;animation:twinkle var(--dur,3s) ease-in-out infinite;animation-delay:var(--delay,0s)}
@keyframes twinkle{0%,100%{opacity:.55}50%{opacity:1}}

/* Câu chúc & tiêu đề lớn */
.poster__quote{
  position:absolute;left:50%;right:3.5%;top:63%;color:#fff;
  font-family:var(--font-hand);font-weight:500;font-size:3.05cqmin;line-height:1.55;text-align:center;
  animation:fadeIn 1.2s .6s both;
}
.poster__title{position:absolute;right:4.5%;bottom:2.5%;text-align:right;color:#fff;line-height:.9;animation:fadeIn 1.2s .9s both}
.poster__title small{display:block;font-family:var(--font-display);text-transform:uppercase;letter-spacing:.32em;font-size:3.6cqmin;margin-right:1cqmin}
.poster__title b{display:block;font-family:var(--font-hand);font-weight:700;font-size:12.5cqmin;line-height:1;margin-top:-.5cqmin}

@media (orientation:landscape) and (min-width:760px){
  .poster__cal{width:23%;left:3%;top:5%}
  .poster__cal-month{font-size:6cqmin}
  .poster__cal-grid{font-size:3cqmin}
  .poster__quote{left:62%;right:3%;top:61%;font-size:3.1cqmin}
  .poster__title small{font-size:4cqmin}
  .poster__title b{font-size:14cqmin}
}

.wall__foot{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin-top:1.5rem;flex:none}

/* Mobile hẹp: chuyển collage sang dạng xếp dọc */
@media (max-width:600px){
  .poster{
    aspect-ratio:auto;container-type:normal;width:100%;
    display:flex;flex-direction:column;gap:1.5rem;padding:1.5rem 1.1rem 1.75rem;
  }
  .poster__cal{position:static;width:100%}
  .poster__cal-month{font-size:1.9rem;padding-bottom:.4rem}
  .poster__cal-month::after{bottom:-.3rem}
  .poster__cal-grid{font-size:.95rem;gap:.35rem .2rem;margin-top:.9rem}
  .poster__cal-grid .is-bday::before{inset:-16%;filter:drop-shadow(0 0 6px rgba(230,57,70,.6))}
  .poster__photos{display:grid;grid-template-columns:1fr 1fr;gap:1.4rem 1.1rem;padding:.4rem .3rem}
  .poster__photo{position:static;width:auto;animation-name:dropInStatic}
  .poster__photo .frame{font-size:.6rem;box-shadow:0 10px 24px rgba(0,0,0,.7)}
  .poster__photo .fav-badge{width:1.7rem;height:1.7rem;top:-.65rem;right:-.65rem}
  .poster__deco{display:none}
  .poster__quote{position:static;font-size:1.25rem;padding:0 .25rem}
  .poster__title{position:static;text-align:right}
  .poster__title small{font-size:1rem}
  .poster__title b{font-size:3.6rem;margin-top:-.2rem}
  @keyframes dropInStatic{from{opacity:0;transform:translateY(-16px)}to{opacity:1;transform:none}}
}

/* =============================================================
   LIGHTBOX
   ============================================================= */
.lightbox{
  position:fixed;inset:0;z-index:40;background:rgba(8,4,12,.9);backdrop-filter:blur(14px);
  display:flex;align-items:center;justify-content:center;padding:2rem 3.5rem;animation:fadeIn .3s both;
}
.lightbox[hidden]{display:none}
.lightbox__body .frame{animation:popIn .55s var(--ease) both}
@keyframes popIn{from{opacity:0;transform:scale(.85) rotate(var(--tilt,0deg))}to{opacity:1;transform:scale(1) rotate(var(--tilt,0deg))}}
.lightbox__close,.lightbox__nav{
  position:absolute;width:2.8rem;height:2.8rem;border-radius:50%;border:1px solid rgba(255,255,255,.15);
  background:rgba(255,255,255,.08);color:#fff;font-size:1.6rem;line-height:1;cursor:pointer;display:grid;place-items:center;
  transition:background .2s;
}
.lightbox__close:hover,.lightbox__nav:hover{background:rgba(255,255,255,.2)}
.lightbox__close{top:1rem;right:1rem}
.lightbox__nav{top:50%;transform:translateY(-50%)}
.lightbox__nav--prev{left:.75rem}
.lightbox__nav--next{right:.75rem}
@media (max-width:600px){.lightbox{padding:3.5rem 1rem}.lightbox__nav{top:auto;bottom:1rem;transform:none}}

/* =============================================================
   MÀN 4 — LỜI CHÚC
   ============================================================= */
#stage-finale{overflow-y:auto;justify-content:flex-start;padding:calc(2rem + env(safe-area-inset-top,0px)) 1rem calc(2rem + env(safe-area-inset-bottom,0px))}
.finale{display:flex;flex-direction:column;align-items:center;gap:1.75rem;max-width:640px;width:100%;text-align:center;animation:rise 1s var(--ease) both;margin:auto}
.card{
  width:100%;background:rgba(255,247,234,.05);border:1px solid rgba(255,255,255,.12);border-radius:1.5rem;
  padding:2rem 1.5rem 1.75rem;backdrop-filter:blur(14px);box-shadow:0 30px 60px -30px rgba(0,0,0,.6);
}
.card__title{font-family:var(--font-display);font-weight:500;font-size:clamp(1.5rem,4vw,2.2rem);color:var(--gold-2);line-height:1.3}
.card__title span{font-family:var(--font-hand);font-weight:700;color:var(--rose);font-size:1.35em}
.card__msg{margin:1.25rem 0 1.5rem;line-height:1.9;font-weight:300;white-space:pre-line;min-height:5em;text-align:left}
.card__msg::after{content:"▍";color:var(--gold);animation:blink 1s step-end infinite;margin-left:1px}
.card__msg.is-done::after{content:none}
.card__sign{font-family:var(--font-hand);font-size:1.7rem;color:var(--rose);text-align:right;margin:-.5rem 0 1.25rem;opacity:0;transform:translateY(6px);transition:opacity .9s,transform .9s}
.card__sign.is-visible{opacity:1;transform:none}
@keyframes blink{50%{opacity:0}}

#btn-restart,#btn-blow{animation:rise .9s var(--ease) both}
#btn-restart[hidden],#btn-blow[hidden]{display:none}

/* Bánh kem CSS */
.cake{position:relative;width:250px;height:210px;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;filter:drop-shadow(0 20px 30px rgba(0,0,0,.5));flex:none}
.cake__candles{display:flex;gap:26px;margin-bottom:-4px;position:relative;z-index:3}
.candle{position:relative;width:11px;height:40px;border-radius:3px;background:repeating-linear-gradient(135deg,#fff8f0 0 5px,#f2a7bb 5px 10px)}
.candle::before{content:"";position:absolute;left:50%;top:-6px;width:2px;height:7px;background:#3a2a1a;transform:translateX(-50%)}
.flame{
  position:absolute;left:50%;top:-26px;width:14px;height:22px;transform:translateX(-50%);transform-origin:50% 100%;
  border-radius:50% 50% 50% 50%/60% 60% 40% 40%;
  background:radial-gradient(ellipse at 50% 75%,#fffbe6 0%,#ffd166 35%,#ff8c1a 65%,rgba(255,80,0,0) 100%);
  box-shadow:0 0 18px 6px rgba(255,170,60,.35);
  animation:flicker .22s ease-in-out infinite alternate;transition:transform .5s var(--ease),opacity .5s;
}
.candle:nth-child(2) .flame{animation-delay:.08s}
.candle:nth-child(3) .flame{animation-delay:.15s}
@keyframes flicker{from{transform:translateX(-50%) scale(1) rotate(-3deg)}to{transform:translateX(-50%) scale(1.08,1.15) rotate(3deg)}}
.cake.is-out .flame{animation:none;transform:translateX(-50%) scale(.1,0);opacity:0;box-shadow:none}
.smoke{position:absolute;left:50%;top:-30px;width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,.55);opacity:0;transform:translateX(-50%)}
.cake.is-out .smoke{animation:smoke 1.8s ease-out forwards}
@keyframes smoke{0%{opacity:0;transform:translate(-50%,0) scale(.6)}20%{opacity:.6}100%{opacity:0;transform:translate(-20%,-70px) scale(2.6)}}
.cake__layer{position:relative;border-radius:14px 14px 8px 8px}
.cake__layer--top{width:150px;height:46px;background:linear-gradient(#fbd5df,#eea2b8);z-index:2}
.cake__layer--bottom{width:200px;height:58px;background:linear-gradient(#f7bccb,#e1879f);margin-top:-6px;z-index:1}
.cake__layer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:24px;border-radius:14px 14px 0 0;
  background:radial-gradient(circle at 10px 8px,#fffaf3 9px,transparent 10px) 0 4px/20px 20px repeat-x,
             linear-gradient(#fffaf3,#fffaf3) 0 0/100% 12px no-repeat;
}
.cake__plate{width:250px;height:26px;border-radius:50%;background:radial-gradient(ellipse at 50% 35%,#fff 0%,#e9dfe6 55%,#cfc1cc 100%);margin-top:-10px}

@media (max-width:600px){
  #stage-finale{padding:1.25rem 1rem 2rem}
  .finale{gap:1rem}
  .cake{transform:scale(.72);transform-origin:50% 100%;height:150px;margin-bottom:-.25rem}
  .card{padding:1.5rem 1.15rem 1.4rem;border-radius:1.25rem}
  .card__msg{margin:1rem 0 1.1rem;line-height:1.75;font-size:.95rem}
  .card__sign{font-size:1.5rem;margin:-.3rem 0 1rem}
}

/* ---------- Nút góc: nhạc + toàn màn hình ---------- */
.corner-bar{position:fixed;top:calc(1rem + env(safe-area-inset-top,0px));right:calc(1rem + env(safe-area-inset-right,0px));z-index:45;display:flex;gap:.5rem}
.corner-btn{
  width:2.8rem;height:2.8rem;border-radius:50%;display:grid;place-items:center;
  border:1px solid rgba(255,255,255,.15);background:rgba(14,8,18,.6);color:var(--text);
  backdrop-filter:blur(10px);cursor:pointer;font-size:1.2rem;transition:color .3s,background .2s;
}
.corner-btn:hover{background:rgba(255,255,255,.14)}
.corner-btn[hidden]{display:none}
#btn-music.is-on{color:var(--gold);animation:pulse 1.6s ease-in-out infinite}
@keyframes pulse{50%{box-shadow:0 0 0 8px rgba(233,196,106,.12)}}
#btn-fs .ico-fs-exit{display:none}
#btn-fs.is-on .ico-fs-enter{display:none}
#btn-fs.is-on .ico-fs-exit{display:block}

/* ---------- Giảm chuyển động ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  .frame__photo img{animation:none}
}