*{box-sizing:border-box;}
:root{--kyyeu-accent:#5C87A8; --kyyeu-heading-font:'Cormorant Garamond',serif; --kyyeu-heading-scale:1;
      --winter-warm:#E8A860; --winter-ice:#C4DCEA;}
html{background:#E4EEF4;}
body{margin:0; color:#2A3E4A; font-family:'Literata',serif; line-height:1.8; overflow-x:hidden;
  background:var(--kyyeu-bg, linear-gradient(180deg,#F2F8FB 0%,#DCEAF2 45%,#C8DCE8 100%));}
.wrap{max-width:720px; margin:0 auto; position:relative; z-index:4;}
@media (prefers-reduced-motion: reduce){ .flake,.breath span,.frost-edge{animation:none !important;} }

/* TUYẾT RƠI 3 LỚP CÓ CHIỀU SÂU */
.snow-layer{position:fixed; inset:0; pointer-events:none; overflow:hidden;}
.snow-layer.far{z-index:1;} .snow-layer.mid{z-index:2;} .snow-layer.near{z-index:3;}
.flake{position:absolute; top:-6vh; border-radius:50%; background:#fff; animation:snowFall linear infinite;}
.snow-layer.far .flake{opacity:.42; filter:blur(1.4px);}
.snow-layer.mid .flake{opacity:.72; filter:blur(.5px);}
.snow-layer.near .flake{opacity:.95; box-shadow:0 0 6px rgba(255,255,255,.85);}
@keyframes snowFall{
  0%{transform:translateY(0) translateX(0) rotate(0);}
  100%{transform:translateY(112vh) translateX(var(--sway,30px)) rotate(240deg);}
}

/* SƯƠNG GIÁ BÒ LAN VIỀN MÀN HÌNH */
.frost-edge{position:fixed; inset:0; z-index:5; pointer-events:none;
  box-shadow:inset 0 0 90px 30px rgba(196,220,234,.4), inset 0 0 30px 6px rgba(255,255,255,.5);
  animation:frostBreathe 9s ease-in-out infinite;}
@keyframes frostBreathe{0%,100%{opacity:.65;} 50%{opacity:1;}}

.cover{padding:56px 22px 26px; text-align:center; position:relative; z-index:6;}
.eyebrow{font-size:10.5px; letter-spacing:.32em; color:var(--kyyeu-accent); margin-bottom:24px;}
.cover-photo{position:relative; width:190px; height:190px; margin:0 auto 22px; border-radius:50%; overflow:hidden;
  border:5px solid #fff; box-shadow:0 16px 34px rgba(42,62,74,.18);}
.cover-photo img{width:100%; height:100%; object-fit:cover; filter:saturate(.9) brightness(1.02);}
.photo-frost{position:absolute; inset:0; pointer-events:none;
  background:linear-gradient(155deg, rgba(255,255,255,.4) 0%, transparent 38%, transparent 70%, rgba(196,220,234,.35) 100%);}
.warm-glow{position:absolute; inset:-16px; border-radius:50%; pointer-events:none;
  background:radial-gradient(circle, rgba(232,168,96,.18), transparent 68%); animation:frostBreathe 6s ease-in-out infinite;}
.cover h1{font-family:var(--kyyeu-heading-font); font-style:italic; font-weight:600;
  font-size:calc(42px * var(--kyyeu-heading-scale)); margin:0 0 10px; color:var(--kyyeu-accent);}
.winter-line{font-family:var(--kyyeu-heading-font); font-style:italic; font-size:16px; color:#6A8A9E; margin:0 0 12px;}
.cover-meta{margin:0 0 22px; font-size:13.5px; color:#6A8A9E;}

/* HƠI THỞ TRẮNG */
.breath{display:flex; justify-content:center; gap:6px; height:34px; align-items:flex-end;}
.breath span{width:12px; height:12px; border-radius:50%; background:rgba(255,255,255,.9);
  filter:blur(4px); animation:breathe 4.5s ease-out infinite;}
.breath span:nth-child(2){animation-delay:1.5s; width:16px; height:16px;}
.breath span:nth-child(3){animation-delay:3s;}
@keyframes breathe{
  0%{opacity:0; transform:translateY(0) scale(.4);}
  25%{opacity:.85;}
  100%{opacity:0; transform:translateY(-32px) scale(2.6);}
}
.breath-hint{font-size:11.5px; color:#8AA4B4; font-style:italic; margin:6px 0 0;}

.section{padding:54px 24px 8px; position:relative; z-index:6;}
.section-head{text-align:center; margin-bottom:30px;}
.section h2{font-family:var(--kyyeu-heading-font); font-style:italic; font-weight:600;
  font-size:calc(28px * var(--kyyeu-heading-scale)); color:var(--kyyeu-accent); margin:0 0 6px;}
.section .sub{font-size:12.5px; color:#7A94A4;}

/* ẢNH PHỦ SƯƠNG — DI CHUỘT LÀM ẤM */
.winter-gallery{display:grid; grid-template-columns:repeat(3,1fr); gap:18px;}
.frost-frame{margin:0; position:relative; border-radius:12px; overflow:hidden;
  opacity:0; transform:translateY(18px);
  transition:opacity .9s ease var(--d), transform .9s cubic-bezier(.2,.85,.3,1) var(--d), box-shadow .5s ease;
  box-shadow:0 10px 24px rgba(42,62,74,.14);}
.frost-frame.chilled{opacity:1; transform:translateY(0);}
.frost-frame img{width:100%; height:140px; object-fit:cover; display:block;
  filter:saturate(.68) brightness(1.04) contrast(.96); transition:filter .8s ease, transform .8s ease;}
.frame-frost{position:absolute; inset:0; pointer-events:none; transition:opacity .8s ease;
  background:linear-gradient(150deg, rgba(255,255,255,.5), rgba(196,220,234,.34) 55%, rgba(255,255,255,.28));
  backdrop-filter:blur(1.6px);}
.frost-frame:hover img{filter:saturate(1.05) brightness(1.02) contrast(1.02); transform:scale(1.04);}
.frost-frame:hover .frame-frost{opacity:0;}
.frost-frame:hover{box-shadow:0 0 30px 4px rgba(232,168,96,.22), 0 14px 30px rgba(42,62,74,.16);}
.frost-frame figcaption{position:absolute; left:0; right:0; bottom:0; padding:8px 10px; font-size:11.5px;
  color:#fff; background:linear-gradient(transparent, rgba(30,48,58,.85));}
@media(max-width:600px){.winter-gallery{grid-template-columns:repeat(2,1fr);}}

.see-full{text-align:center; margin:32px 0 0;}
.see-full a{font-family:var(--kyyeu-heading-font); font-style:italic; font-size:15px; color:var(--kyyeu-accent);
  text-decoration:none; border-bottom:1px solid rgba(92,135,168,.4); padding-bottom:2px;}

/* KÝ ỨC NGÀY ĐÔNG */
.winter-list{max-width:520px; margin:0 auto;}
.winter-item{display:flex; gap:16px; padding:16px 0; border-bottom:1px solid rgba(92,135,168,.14);}
.winter-item:last-child{border-bottom:none;}
.wi-flake{font-size:18px; color:var(--kyyeu-accent); flex-shrink:0; animation:flakeSpin 8s linear infinite;}
@keyframes flakeSpin{from{transform:rotate(0);} to{transform:rotate(360deg);}}
.wi-body strong{display:block; font-family:var(--kyyeu-heading-font); font-size:16.5px; color:#2A3E4A; margin-bottom:3px;}
.wi-body span{font-size:13.5px; color:#6A8A9E;}

/* ĐIỀU ƯỚC BÔNG TUYẾT */
.wish-flakes{display:grid; grid-template-columns:1fr 1fr; gap:16px; max-width:560px; margin:0 auto;}
.wish-flake{position:relative; min-height:110px; border-radius:14px; cursor:pointer; padding:20px;
  background:rgba(255,255,255,.62); backdrop-filter:blur(6px); border:1px solid rgba(196,220,234,.7);
  display:flex; align-items:center; justify-content:center;
  transition:background .6s ease, box-shadow .6s ease, transform .4s ease;}
.wf-icon{font-size:28px; color:var(--kyyeu-accent); animation:flakeSpin 12s linear infinite;}
.wf-text{display:none; text-align:center;}
.wf-text p{margin:0 0 8px; font-size:14px; color:#2A3E4A; font-style:italic;}
.wf-text cite{font-family:var(--kyyeu-heading-font); font-style:normal; font-size:12.5px; color:var(--kyyeu-accent);}
.wish-flake.melted{background:rgba(255,248,238,.9); box-shadow:0 0 26px 4px rgba(232,168,96,.2); transform:scale(1.02);}
.wish-flake.melted .wf-icon{display:none;}
.wish-flake.melted .wf-text{display:block; animation:meltIn .55s ease;}
@keyframes meltIn{from{opacity:0; transform:translateY(-8px);} to{opacity:1; transform:translateY(0);}}
@media(max-width:560px){.wish-flakes{grid-template-columns:1fr;}}

/* LỜI NHẮN GIỮ ẤM */
.warm-notes{max-width:520px; margin:0 auto;}
.warm-note{background:#fff; border-radius:12px; padding:17px 20px; margin-bottom:14px;
  box-shadow:0 8px 20px rgba(42,62,74,.09); border-left:3px solid var(--winter-warm);}
.warm-note p{margin:0 0 8px; font-size:14.5px; color:#2A3E4A;}
.warm-note cite{font-family:var(--kyyeu-heading-font); font-style:italic; font-size:13.5px; color:var(--winter-warm);}

.share{margin:58px 24px 30px; padding:42px 26px; text-align:center; border-radius:18px;
  background:linear-gradient(150deg,#5C87A8,#3A5E78); color:#EAF4F8; position:relative; z-index:6;}
.share h2{font-family:var(--kyyeu-heading-font); font-style:italic; font-size:26px; margin:0 0 8px; color:#F0DCC0;}
.share p{font-size:13px; margin:0 0 20px; opacity:.86;}
#qrcode{background:#fff; display:inline-block; padding:9px; border-radius:10px; margin-bottom:16px;}
.link-row{display:flex; justify-content:center; gap:8px; flex-wrap:wrap; font-size:12.5px;}
.link-row code{background:rgba(234,244,248,.16); padding:7px 13px; border-radius:20px;}
.link-row button{background:var(--winter-warm); color:#3A2A12; border:none; padding:7px 15px; border-radius:20px;
  font-size:12px; font-weight:700; cursor:pointer;}

.foot{text-align:center; font-size:11.5px; color:#7A94A4; padding:0 20px 44px; position:relative; z-index:6;}

/* ============ TÍNH NĂNG ĐẶC BIỆT ============ */

/* 1. LỊCH MÙA ĐÔNG — Ô CỬA MỞ RA */
.advent-grid{display:grid; grid-template-columns:repeat(4,1fr); gap:12px; max-width:520px; margin:0 auto;}
.advent-door{position:relative; aspect-ratio:1; border-radius:10px; cursor:pointer; overflow:hidden;
  background:linear-gradient(150deg,#7FA8C4,#5C87A8); border:3px solid #fff;
  box-shadow:0 8px 18px rgba(42,62,74,.16); transition:transform .35s ease;}
.advent-door:hover{transform:translateY(-3px);}
.ad-num{position:absolute; inset:0; display:flex; align-items:center; justify-content:center;
  font-family:var(--kyyeu-heading-font); font-size:26px; color:#fff; transition:opacity .5s ease;}
.ad-content{position:absolute; inset:0; background:#fff; padding:10px; display:flex; align-items:center;
  justify-content:center; text-align:center; font-size:11.5px; color:#2A3E4A; line-height:1.5;
  opacity:0; transform:rotateY(-100deg); transform-origin:left center; transition:opacity .5s ease, transform .6s ease;}
.advent-door.opened .ad-num{opacity:0;}
.advent-door.opened .ad-content{opacity:1; transform:rotateY(0);}
@media(max-width:520px){.advent-grid{grid-template-columns:repeat(3,1fr);}}