/* ==========================================================
   THIỆP CƯỚI ONLINE – KHUNG CHUNG (engine)  v1.0
   Mỗi mẫu = 1 khối biến màu/font trong [data-theme="..."]
   ========================================================== */
:root{
  --bg:#fbf3f1; --bg2:#fff; --card:#fff; --text:#3a2c31; --muted:#86767b;
  --primary:#b4536a; --primary-ink:#fff; --accent:#c29a5b; --line:rgba(180,83,106,.18);
  --hero-bg:linear-gradient(170deg,#fdf1f3,#f3d9df 60%,#ecc6cf); --on-hero:#8f3a50;
  --cover-bg:var(--hero-bg); --on-cover:var(--on-hero);
  --f-title:'Playfair Display',Georgia,serif; --f-script:'Great Vibes',cursive; --f-body:'Be Vietnam Pro',system-ui,sans-serif;
  --radius:18px; --shadow:0 20px 50px -24px rgba(0,0,0,.35); --script-scale:1;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--f-body);background:var(--bg);color:var(--text);line-height:1.65;overflow-x:hidden;-webkit-font-smoothing:antialiased}
body.locked{overflow:hidden}
img{max-width:100%;display:block}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit}
#app{max-width:560px;margin:0 auto;background:var(--bg);position:relative;box-shadow:0 0 60px rgba(0,0,0,.08);min-height:100vh}
@media (min-width:561px){body{background:var(--desk-bg,#e9e3e4)}}

/* ---------- Effect canvas ---------- */
#fx{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:40}

/* ---------- Cover (mở thiệp) ---------- */
.cover{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;background:var(--cover-bg);color:var(--on-cover);text-align:center;padding:32px 24px;transition:opacity .9s ease,transform .9s ease}
.cover.open{opacity:0;transform:scale(1.08);pointer-events:none}
.cover-inner{max-width:380px;width:100%;position:relative;padding:44px 26px;border:1px solid currentColor;border-radius:calc(var(--radius) + 8px);background:rgba(255,255,255,.08)}
.cover-inner::before{content:"";position:absolute;inset:8px;border:1px dashed currentColor;border-radius:var(--radius);opacity:.35;pointer-events:none}
.cover .kicker{font-size:12px;letter-spacing:.3em;text-transform:uppercase;opacity:.85}
.cover .names{font-family:var(--f-script);font-size:calc(46px*var(--script-scale));line-height:1.15;margin:18px 0 6px}
.cover .date{font-family:var(--f-title);letter-spacing:.2em;font-size:15px}
.cover .to{margin:26px 0 22px;font-size:14px;opacity:.9}
.cover .to b{display:block;font-family:var(--f-title);font-size:22px;margin-top:4px;opacity:1}
.cover .seal{width:78px;height:78px;margin:0 auto 6px;border-radius:50%;display:flex;align-items:center;justify-content:center;gap:1px;background:var(--seal-bg,var(--primary));color:var(--seal-ink,var(--primary-ink));font-family:var(--f-title);font-size:24px;letter-spacing:.02em;box-shadow:0 10px 24px -8px rgba(0,0,0,.45);animation:beat 2.2s ease-in-out infinite}
@keyframes beat{0%,100%{transform:scale(1)}50%{transform:scale(1.07)}}
.cover .seal i{font-size:14px;opacity:.8}
.cover .btn{background:var(--seal-bg,var(--primary));color:var(--seal-ink,var(--primary-ink))}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 26px;border-radius:999px;border:0;cursor:pointer;background:var(--primary);color:var(--primary-ink);font-weight:600;font-size:15px;text-decoration:none;transition:transform .2s,filter .2s;box-shadow:0 12px 24px -12px var(--primary)}
.btn:hover{transform:translateY(-2px);filter:brightness(1.05)}
.btn.ghost{background:transparent;color:var(--primary);border:1.5px solid var(--primary);box-shadow:none}
.btn.sm{padding:9px 16px;font-size:13px}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:100svh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:80px 24px 90px;background:var(--hero-bg);color:var(--on-hero);overflow:hidden;isolation:isolate}
.hero .deco{position:absolute;inset:0;z-index:-1;pointer-events:none}
.hero .deco svg{position:absolute}
.hero canvas.h3d{position:absolute;inset:0;width:100%;height:100%;z-index:-1}
.hero .pre{font-size:12px;letter-spacing:.35em;text-transform:uppercase}
.hero .n1,.hero .n2{font-family:var(--f-script);font-size:calc(64px*var(--script-scale));line-height:1.05}
.hero .amp{font-family:var(--f-title);font-style:italic;font-size:30px;color:var(--accent);margin:2px 0}
.hero .hdate{margin-top:22px;display:flex;align-items:center;gap:14px;font-family:var(--f-title)}
.hero .hdate .big{font-size:44px;line-height:1;padding:0 16px;border-left:1px solid currentColor;border-right:1px solid currentColor}
.hero .hdate small{display:block;font-size:12px;letter-spacing:.2em;text-transform:uppercase}
.hero .lunar{margin-top:10px;font-size:13px;opacity:.8;font-style:italic}
.hero .scroll{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);font-size:11px;letter-spacing:.25em;text-transform:uppercase;opacity:.7}
.hero .scroll::after{content:"";display:block;width:1px;height:34px;background:currentColor;margin:8px auto 0;animation:drop 1.8s ease-in-out infinite}
@keyframes drop{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}
.hero .ghost-char{position:absolute;font-size:260px;line-height:1;opacity:.08;top:50%;left:50%;transform:translate(-50%,-50%);z-index:-1;font-family:serif}

/* ---------- Sections ---------- */
.sec{padding:64px 22px;position:relative;text-align:center}
.sec:nth-of-type(even){background:var(--bg2)}
.sec h2{font-family:var(--f-script);font-size:calc(46px*var(--script-scale));color:var(--primary);line-height:1.2;font-weight:400}
.sec .sub{font-size:12px;letter-spacing:.3em;text-transform:uppercase;color:var(--muted);margin-top:2px}
.orn{display:block;margin:14px auto 26px;width:150px;height:18px;color:var(--accent)}
.reveal{opacity:0;transform:translateY(26px);transition:opacity .9s ease,transform .9s ease}
.reveal.in{opacity:1;transform:none}
.card{background:var(--card);border-radius:var(--radius);border:1px solid var(--line);box-shadow:var(--shadow)}

/* Invite */
.quote{font-family:var(--f-title);font-style:italic;font-size:17px;max-width:420px;margin:0 auto 30px;color:var(--muted)}
.families{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:30px}
.families h4{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--accent);margin-bottom:6px}
.families p{font-size:14px}
.families .addr{color:var(--muted);font-size:12.5px;margin-top:4px}
.announce{font-size:13px;letter-spacing:.15em;text-transform:uppercase;color:var(--muted);margin-bottom:18px}
.people{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:10px}
.person .avatar{width:118px;height:118px;margin:0 auto 12px;border-radius:50%;overflow:hidden;border:3px solid var(--card);outline:1px solid var(--accent);outline-offset:4px;box-shadow:var(--shadow)}
.person .avatar img{width:100%;height:100%;object-fit:cover}
.person .role{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.person .pname{font-family:var(--f-title);font-size:20px;color:var(--primary);line-height:1.3}
.people .heart{font-size:26px;color:var(--accent);animation:beat 2s infinite}

/* Countdown */
.cd{display:flex;justify-content:center;gap:10px;margin-top:6px}
.cd div{width:74px;padding:14px 0;border-radius:14px;background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow)}
.cd b{display:block;font-family:var(--f-title);font-size:30px;color:var(--primary);line-height:1.1}
.cd small{font-size:10px;letter-spacing:.15em;text-transform:uppercase;color:var(--muted)}

/* Calendar */
.cal{max-width:340px;margin:30px auto 0;padding:20px 18px}
.cal .mh{font-family:var(--f-title);font-size:18px;color:var(--primary);margin-bottom:10px}
.cal .grid{display:grid;grid-template-columns:repeat(7,1fr);gap:4px;font-size:13px}
.cal .grid span{height:34px;display:grid;place-items:center;border-radius:50%;position:relative}
.cal .grid .wd{font-size:10px;color:var(--muted);font-weight:600;height:24px}
.cal .grid .day-on{color:var(--primary-ink);font-weight:700;z-index:0}
.cal .grid .day-on::before{content:"♥";position:absolute;inset:-6px;display:grid;place-items:center;font-size:44px;line-height:1;color:var(--primary);z-index:-1;animation:beat 1.8s infinite}

/* Events */
.events{display:grid;gap:18px}
.event{padding:26px 22px;text-align:center;overflow:hidden;position:relative}
.event .etitle{font-family:var(--f-title);font-size:20px;color:var(--primary)}
.event .etime{display:flex;justify-content:center;align-items:center;gap:14px;margin:14px 0;font-family:var(--f-title)}
.event .etime .t{font-size:26px;color:var(--text)}
.event .etime .d{font-size:13px;text-align:left;line-height:1.35;color:var(--muted);border-left:1px solid var(--line);padding-left:14px}
.event .venue{font-weight:600}
.event .addr{font-size:13.5px;color:var(--muted);margin:2px 0 16px}
.event .acts{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}

/* Story */
.story{position:relative;text-align:left;max-width:440px;margin:0 auto;padding-left:26px}
.story::before{content:"";position:absolute;left:7px;top:6px;bottom:6px;width:1px;background:var(--line)}
.story .it{position:relative;margin-bottom:26px}
.story .it::before{content:"";position:absolute;left:-26px;top:6px;width:15px;height:15px;border-radius:50%;background:var(--card);border:2px solid var(--primary)}
.story .when{font-size:12px;letter-spacing:.15em;text-transform:uppercase;color:var(--accent);font-weight:600}
.story h3{font-family:var(--f-title);font-size:18px;color:var(--primary);margin:2px 0 4px;font-weight:600}
.story p{font-size:14.5px;color:var(--muted)}

/* Album */
.album{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.album .ph{border-radius:12px;overflow:hidden;cursor:zoom-in;aspect-ratio:3/4;position:relative}
.album .ph:nth-child(3n+1){grid-column:span 2;aspect-ratio:16/10}
.album .ph img,.album .ph svg{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.album .ph:hover img,.album .ph:hover svg{transform:scale(1.05)}
.lb{position:fixed;inset:0;z-index:120;background:rgba(10,8,9,.92);display:none;align-items:center;justify-content:center;padding:18px}
.lb.on{display:flex}
.lb .stage{max-width:520px;width:100%;max-height:86vh}
.lb .stage img,.lb .stage svg{width:100%;max-height:86vh;object-fit:contain;border-radius:10px}
.lb button{position:absolute;background:rgba(255,255,255,.12);color:#fff;border:0;width:44px;height:44px;border-radius:50%;font-size:22px;cursor:pointer}
.lb .x{top:16px;right:16px}.lb .pv{left:12px;top:50%}.lb .nx{right:12px;top:50%}

/* Forms */
.form{padding:24px 20px;text-align:left;display:grid;gap:12px}
.form label{font-size:12.5px;font-weight:600;display:grid;gap:6px;color:var(--muted)}
.form input,.form select,.form textarea{width:100%;padding:12px 14px;border-radius:12px;border:1.5px solid var(--line);background:var(--bg);font-size:15px;color:var(--text)}
.form input:focus,.form select:focus,.form textarea:focus{outline:none;border-color:var(--primary)}
.form textarea{min-height:90px;resize:vertical}
.form .row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.form .seg{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.form .seg input{position:absolute;opacity:0;pointer-events:none;left:0;top:0;width:1px;height:1px}
.form .seg label{position:relative;overflow:hidden}
.form{position:relative;overflow:hidden}
.form .seg label{display:block;text-align:center;padding:11px 8px;border-radius:12px;border:1.5px solid var(--line);cursor:pointer;color:var(--text);font-weight:500;font-size:14px}
.form .seg input:checked+span{color:var(--primary);font-weight:700}
.form .seg label:has(input:checked){border-color:var(--primary);background:color-mix(in srgb,var(--primary) 8%,transparent)}
.form .btn{width:100%;margin-top:4px}
.form .msg{display:none;text-align:center;font-size:14px;padding:10px;border-radius:10px;background:color-mix(in srgb,var(--primary) 10%,transparent);color:var(--primary)}
.hp{position:absolute!important;left:-9999px!important}

/* Wishes */
.wishes{margin-top:18px;max-height:360px;overflow-y:auto;display:grid;gap:10px;text-align:left;padding:4px 2px;scrollbar-width:thin}
.wish{padding:14px 16px;border-radius:14px;background:var(--card);border:1px solid var(--line)}
.wish b{color:var(--primary);font-size:14px}
.wish p{font-size:14px;margin-top:2px}
.wish.new{animation:pop .6s ease}
@keyframes pop{from{opacity:0;transform:translateY(-10px)}}

/* Gift */
.gifts{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.gift{padding:18px 12px}
.gift h4{font-size:12px;letter-spacing:.15em;text-transform:uppercase;color:var(--accent);margin-bottom:10px}
.gift .qr{background:#fff;border-radius:12px;padding:8px;aspect-ratio:1;display:grid;place-items:center;overflow:hidden}
.gift .qr img{width:100%;height:100%;object-fit:contain}
.gift .qr .noqr{font-size:12px;color:#888}
.gift .bank{font-size:12.5px;margin-top:10px;color:var(--muted)}
.gift .acc{font-family:var(--f-title);font-size:16px;color:var(--text);word-break:break-all}
.gift .own{font-size:12px;font-weight:600;text-transform:uppercase}
.gift .btn{margin-top:10px}

/* Thanks */
.thanks{padding:70px 24px 110px;text-align:center;background:var(--hero-bg);color:var(--on-hero)}
.thanks .big{font-family:var(--f-script);font-size:calc(54px*var(--script-scale));line-height:1.1}
.thanks p{max-width:380px;margin:12px auto 0;font-size:14.5px;opacity:.9}
.credit{display:block;margin-top:34px;font-size:11px;letter-spacing:.12em;opacity:.65;text-decoration:none}

/* Floating */
.fab{position:fixed;z-index:60;right:14px;bottom:18px;display:grid;gap:10px}
@media (min-width:561px){.fab{right:calc(50% - 280px + 14px)}}
.fab button,.fab a{width:46px;height:46px;border-radius:50%;border:0;display:grid;place-items:center;background:var(--primary);color:var(--primary-ink);box-shadow:0 10px 22px -8px rgba(0,0,0,.45);cursor:pointer;font-size:18px;text-decoration:none}
.fab .music.playing svg{animation:spin 4s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,40px);background:rgba(20,16,18,.9);color:#fff;padding:10px 18px;border-radius:999px;font-size:14px;z-index:130;opacity:0;transition:.35s;pointer-events:none}
.toast.on{opacity:1;transform:translate(-50%,0)}

@media (max-width:380px){
  .hero .n1,.hero .n2{font-size:calc(52px*var(--script-scale))}
  .person .avatar{width:96px;height:96px}
  .cd div{width:64px}
  .gifts,.families{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.reveal{opacity:1;transform:none}#fx{display:none}}

/* ==========================================================
   12 MẪU (THEMES)
   ========================================================== */

/* 1. Hồng Pastel – Lãng mạn */
[data-theme="hong-pastel"]{--desk-bg:#efdfe2}

/* 2. Hoa Mẫu Đơn – Lãng mạn */
[data-theme="hoa-mau-don"]{
  --bg:#fff8f6; --bg2:#fdeeee; --text:#4a2a31; --muted:#8e6c73;
  --primary:#c2415d; --accent:#d98a6c; --line:rgba(194,65,93,.18);
  --hero-bg:radial-gradient(circle at 50% 35%,#fff6f4 0%,#fbdde0 55%,#f4bcc6 100%); --on-hero:#9c2f49;
  --f-title:'Cormorant Garamond',serif; --f-script:'Dancing Script',cursive; --script-scale:.9; --desk-bg:#f1dcdf;
}

/* 3. Đỏ Song Hỷ – Truyền thống */
[data-theme="do-song-hy"]{
  --bg:#fff7ec; --bg2:#fdeedb; --card:#fffdf8; --text:#4b1a14; --muted:#8a5a4c;
  --primary:#b3261e; --primary-ink:#ffe9b8; --accent:#c9973b; --line:rgba(179,38,30,.2);
  --hero-bg:radial-gradient(circle at 50% 40%,#c8322a 0%,#9e1b16 60%,#7a110e 100%); --on-hero:#ffd98a;
  --f-title:'Lora',serif; --f-script:'Great Vibes',cursive; --desk-bg:#e7d3c3; --radius:10px;
}
[data-theme="do-song-hy"] .cover-inner,[data-theme="do-song-hy"] .event{border-color:var(--accent)}
[data-theme="do-song-hy"] .sec h2{color:var(--primary)}
[data-theme="do-song-hy"],[data-theme="nha-vuon-3d"]{--seal-bg:var(--accent);--seal-ink:#2a1a0c}

/* 4. Vàng Kim Hỷ Sự – Truyền thống */
[data-theme="vang-kim"]{
  --bg:#fffaf0; --bg2:#f8efdc; --card:#fffdf7; --text:#3f2d12; --muted:#8a7450;
  --primary:#a8801f; --primary-ink:#fff; --accent:#c9a24a; --line:rgba(168,128,31,.25);
  --hero-bg:linear-gradient(180deg,#fff9ea 0%,#f6e7c1 100%); --on-hero:#7d5c12;
  --f-title:'Cormorant Garamond',serif; --f-script:'Great Vibes',cursive; --desk-bg:#ebe2cc; --radius:6px;
}

/* 5. Trắng Kem Tối Giản – Hiện đại */
[data-theme="trang-kem"]{
  --bg:#faf8f4; --bg2:#f3efe8; --card:#fff; --text:#2c2a26; --muted:#8b857a;
  --primary:#2c2a26; --primary-ink:#faf8f4; --accent:#a89f8f; --line:rgba(44,42,38,.14);
  --hero-bg:#faf8f4; --on-hero:#2c2a26; --shadow:none;
  --f-title:'Cormorant Garamond',serif; --f-script:'Cormorant Garamond',serif; --script-scale:.78; --radius:2px; --desk-bg:#e8e4dc;
}
[data-theme="trang-kem"] .hero .n1,[data-theme="trang-kem"] .hero .n2,[data-theme="trang-kem"] .sec h2,[data-theme="trang-kem"] .cover .names,[data-theme="trang-kem"] .thanks .big{font-style:italic;letter-spacing:.02em}
[data-theme="trang-kem"] .btn{border-radius:2px;box-shadow:none;letter-spacing:.12em;text-transform:uppercase;font-size:12.5px}

/* 6. Hàn Quốc – Hiện đại */
[data-theme="han-quoc"]{
  --bg:#f7f3ee; --bg2:#efe8df; --card:#fffdfa; --text:#4a4038; --muted:#9a8e82;
  --primary:#9c8471; --primary-ink:#fff; --accent:#c4ae96; --line:rgba(156,132,113,.22);
  --hero-bg:linear-gradient(180deg,#f7f3ee,#ebe1d5); --on-hero:#6d5a4b;
  --f-title:'Nunito',sans-serif; --f-script:'Dancing Script',cursive; --f-body:'Nunito',sans-serif; --script-scale:.85; --radius:26px; --desk-bg:#e3dbd1;
}

/* 7. Sông Núi – Thiên nhiên */
[data-theme="song-nui"]{
  --bg:#f4f8f7; --bg2:#e6f0ee; --card:#fff; --text:#243b3a; --muted:#6c8583;
  --primary:#3f7a76; --primary-ink:#fff; --accent:#c79a5b; --line:rgba(63,122,118,.2);
  --hero-bg:linear-gradient(180deg,#e7f1f0 0%,#bcd8d5 55%,#8fbbb7 100%); --on-hero:#1f4c49;
  --f-title:'Lora',serif; --f-script:'Great Vibes',cursive; --desk-bg:#d8e5e3;
}

/* 8. Biển Xanh – Thiên nhiên */
[data-theme="bien-xanh"]{
  --bg:#f3f9fc; --bg2:#e3f1f8; --card:#fff; --text:#17364a; --muted:#6a8698;
  --primary:#1f7fae; --primary-ink:#fff; --accent:#e0b77a; --line:rgba(31,127,174,.2);
  --hero-bg:linear-gradient(180deg,#fdf6ea 0%,#d7eef6 45%,#8fcbe3 100%); --on-hero:#0f4f72;
  --f-title:'Playfair Display',serif; --f-script:'Dancing Script',cursive; --script-scale:.9; --desk-bg:#d6e6ee;
}

/* 9. Đen Vàng Luxury – Sang trọng */
[data-theme="den-vang"]{
  --bg:#0f0e0c; --bg2:#171512; --card:#1c1a16; --text:#eee6d3; --muted:#a59a82;
  --primary:#d4af37; --primary-ink:#14120e; --accent:#d4af37; --line:rgba(212,175,55,.3);
  --hero-bg:radial-gradient(circle at 50% 35%,#24211b 0%,#0f0e0c 70%); --on-hero:#e8c766;
  --f-title:'Playfair Display',serif; --f-script:'Great Vibes',cursive; --desk-bg:#050505; --radius:4px;
  --shadow:0 20px 40px -20px rgba(0,0,0,.8);
}
[data-theme="den-vang"] .form input,[data-theme="den-vang"] .form select,[data-theme="den-vang"] .form textarea{background:#12110e}
[data-theme="den-vang"] .event,[data-theme="den-vang"] .cal{outline:1px solid var(--line);outline-offset:-8px}

/* 10. Vintage Cổ Điển – Sang trọng */
[data-theme="vintage"]{
  --bg:#f3ead8; --bg2:#ebdfc6; --card:#faf4e6; --text:#3b2f22; --muted:#7f6d56;
  --primary:#7a4e2d; --primary-ink:#f7efdd; --accent:#a8834f; --line:rgba(122,78,45,.25);
  --hero-bg:radial-gradient(ellipse at center,#f6eedd 0%,#e6d6b6 75%,#cfb88e 100%); --on-hero:#5a3a22;
  --f-title:'Playfair Display',serif; --f-script:'Great Vibes',cursive; --desk-bg:#d9ccb3; --radius:4px;
}
[data-theme="vintage"] #app::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:45;opacity:.18;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.6'/%3E%3C/svg%3E")}
[data-theme="vintage"] .person .avatar{border-radius:48% 48% 8px 8px}
[data-theme="vintage"] .album .ph{filter:sepia(.35)}

/* 11. Nhà Vườn 3D */
[data-theme="nha-vuon-3d"]{
  --bg:#f5f1e6; --bg2:#ebe5d4; --card:#fffdf6; --text:#263327; --muted:#6f7a67;
  --primary:#3d5a4a; --primary-ink:#f3e7cf; --accent:#c9a869; --line:rgba(61,90,74,.2);
  --hero-bg:radial-gradient(circle at 50% 40%,#3d5a4a 0%,#233629 60%,#16241b 100%); --on-hero:#f3e7cf;
  --f-title:'Cormorant Garamond',serif; --f-script:'Great Vibes',cursive; --desk-bg:#d9d4c3;
}

/* 12. Pháo Hoa 3D */
[data-theme="phao-hoa-3d"]{
  --bg:#0d1226; --bg2:#121a33; --card:#18203d; --text:#e9ecf8; --muted:#9aa3c7;
  --primary:#f2b8c6; --primary-ink:#1a1030; --accent:#ffd27a; --line:rgba(242,184,198,.22);
  --hero-bg:radial-gradient(ellipse at 50% 100%,#2a2458 0%,#0d1226 65%,#070a17 100%); --on-hero:#fff1f5;
  --f-title:'Playfair Display',serif; --f-script:'Great Vibes',cursive; --desk-bg:#05070f;
  --shadow:0 20px 40px -20px rgba(0,0,0,.8);
}
[data-theme="phao-hoa-3d"] .form input,[data-theme="phao-hoa-3d"] .form select,[data-theme="phao-hoa-3d"] .form textarea{background:#0f1530}

/* v1.3: khung nhạc YouTube theo yêu cầu */
.yt-dock{position:fixed;z-index:65;left:12px;bottom:18px;width:min(230px,calc(100vw - 90px));background:rgba(20,16,18,.92);border-radius:14px;padding:8px;box-shadow:0 14px 30px -12px rgba(0,0,0,.6);transform:translateY(140%);opacity:0;transition:.35s;pointer-events:none}
.yt-dock.on{transform:none;opacity:1;pointer-events:auto}
.yt-dock .yt-t{color:#fff;font-size:12.5px;font-weight:600;line-height:1.3;margin:0 2px 6px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.yt-dock .yt-t small{display:block;font-weight:400;opacity:.7;font-size:11px}
.yt-dock iframe{display:block;width:100%;aspect-ratio:16/9;border:0;border-radius:8px;background:#000}
@media (min-width:561px){.yt-dock{left:calc(50% - 280px + 12px)}}