/* ColorNest – "Bàn học tối giản"
   Nền giấy vẽ (ngà ấm, vân giấy nhẹ) + mực xanh bút bi + màu chì. Điểm nhấn duy nhất: đầu trang chủ kẻ "vở ô li".
   Tranh nét đen là nhân vật chính: thẻ tranh là tờ giấy trắng đặt trên tập giấy vẽ. */
:root{
  --page:#f5f1e8;          /* nền trang: màu giấy vẽ */
  --paper:#ffffff;         /* tờ giấy trắng: thẻ tranh, ô nhập, menu xổ xuống */
  --desk:#ebe5d8;          /* giấy vẽ đậm hơn: footer, chip, nền phụ */
  --ink:#1f2430;           /* chữ chính */
  --muted:#635f57;         /* chữ phụ (xám ấm) */
  --line:#ddd5c5;          /* đường kẻ, viền (ấm) */
  --pen:#243f92;           /* mực xanh: link, nút, mục chọn */
  --pen-dark:#1a2f6f;
  --pen-soft:#e9eef9;
  --lead:#5b6170;          /* màu chì: đánh dấu mục đang chọn, nhãn mùa lễ */
  --card-shadow:0 1px 2px rgba(60,48,30,.10),0 4px 14px rgba(60,48,30,.08);
  --card-shadow-hover:0 2px 4px rgba(60,48,30,.12),0 12px 26px rgba(60,48,30,.15);
  --margin-red:#e0525a;    /* lề đỏ vở ô li */
  --grid:rgba(36,63,146,.07); --grid-strong:rgba(36,63,146,.15); /* lưới ô li xanh trong suốt, hoà vào màu giấy */
  /* vân giấy vẽ rất nhẹ */
  --grain: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='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .35 0 0 0 0 .3 0 0 0 0 .2 0 0 0 .05 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  --font:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --r-sm:8px; --r:12px;
  color-scheme:light;
}
*{box-sizing:border-box}
html{background:var(--page)}
body{margin:0;background:var(--page) var(--grain);color:var(--ink);font:400 16px/1.6 var(--font);-webkit-font-smoothing:antialiased}
/* Footer luôn sát chân màn hình kể cả khi trang ít nội dung */
body{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column}
body > main{flex:1 0 auto}
body > footer.site{flex-shrink:0}
a{color:var(--pen)}
img{max-width:100%}
h1,h2,h3{letter-spacing:-.015em}
.wrap{max-width:1200px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
:focus-visible{outline:3px solid var(--pen);outline-offset:2px;border-radius:6px}

/* ---------- Header ---------- */
header.site{background:var(--page) var(--grain);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}
.bar{display:flex;align-items:center;gap:24px;min-height:68px}
.logo{display:flex;align-items:center;gap:10px;font:700 22px/1 var(--font);color:var(--ink);text-decoration:none;letter-spacing:-.02em;margin-right:auto;white-space:nowrap}
.logo i{display:grid;grid-template-columns:1fr 1fr;gap:2px;width:26px;height:26px;transform:rotate(45deg);flex:none}
.logo b{border-radius:50% 50% 50% 3px}
.logo b:nth-child(1){background:#ef5b5b}.logo b:nth-child(2){background:#ffc83d}
.logo b:nth-child(3){background:#2fa3b0}.logo b:nth-child(4){background:var(--pen)}
.brand-logo-img{height:30px;width:auto;object-fit:contain;border-radius:6px}
.nav{display:flex;align-items:center;gap:18px}
.nav-links{display:flex;gap:4px 26px;list-style:none;margin:0;padding:0;flex-wrap:wrap}
.nav-links a{font:500 15px/1 var(--font);color:var(--ink);text-decoration:none;padding:10px 0;display:inline-block}
.nav-links a:hover{color:var(--pen)}
/* mục đang mở: gạch chân màu chì nằm dưới chữ (không đè lên chữ, không kéo qua mũi tên ▾) */
.nav-links > li > a[aria-current="page"]{color:var(--ink);font-weight:600}
.nav-links > li > a[aria-current="page"]:not(.nav-dropdown-toggle),
.nav-links > li > a.nav-dropdown-toggle[aria-current="page"] > span{
  text-decoration:underline;text-decoration-color:var(--lead);text-decoration-thickness:2px;text-underline-offset:7px}
.has-dropdown{position:relative}
.nav-dropdown-toggle{display:inline-flex!important;align-items:center;gap:5px;cursor:pointer}
.dropdown-chevron{width:14px;height:14px;transition:transform .2s ease;color:var(--muted)}
.has-dropdown:hover .dropdown-chevron,.has-dropdown:focus-within .dropdown-chevron{transform:rotate(180deg)}
.sub-menu{display:none;position:absolute;top:100%;left:-14px;min-width:230px;background:var(--paper);border-radius:var(--r);box-shadow:0 14px 30px -10px rgba(29,36,51,.22);border:1px solid var(--line);padding:6px;margin:0;list-style:none;z-index:100}
.has-dropdown:hover .sub-menu,.has-dropdown:focus-within .sub-menu{display:block}
.sub-menu li{margin:0;padding:0}
.nav-links .sub-menu a{display:block;padding:10px 12px;border-radius:var(--r-sm);font:500 14.5px/1.3 var(--font);white-space:nowrap;background:none}
.nav-links .sub-menu a:hover{background:var(--desk);color:var(--pen)}
.nav-links .sub-menu a[aria-current="page"]{background:var(--pen-soft);color:var(--pen)}
/* ô tìm kiếm trên header */
.nav-search{display:flex;align-items:center;width:220px;height:38px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--paper);transition:width .2s ease,border-color .15s,background .15s}
.nav-search:hover{border-color:#c8bfac}
.nav-search:focus-within{width:280px;border-color:var(--pen);background:var(--paper);box-shadow:0 0 0 3px var(--pen-soft)}
.nav-search input{flex:1;min-width:0;height:100%;border:0;background:none;font:400 14.5px var(--font);color:var(--ink);padding:0 0 0 12px}
.nav-search input::placeholder{color:#8f897d}
.nav-search input:focus{outline:none}
.nav-search input::-webkit-search-cancel-button{cursor:pointer}
.nav-search button{display:flex;align-items:center;justify-content:center;height:100%;border:0;background:none;color:var(--muted);padding:0 11px;cursor:pointer;border-radius:0 var(--r-sm) var(--r-sm) 0}
.nav-search button:hover,.nav-search:focus-within button{color:var(--pen)}
.nav-search .ico{width:18px;height:18px}
@media (min-width:981px) and (max-width:1120px){.nav-search{width:196px}.nav-search:focus-within{width:240px}}
.lang-dropdown{position:relative;display:inline-block}
.lang-btn{display:inline-flex;align-items:center;gap:8px;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-sm);padding:7px 10px;font:500 13.5px/1 var(--font);color:var(--ink);cursor:pointer}
.lang-btn:hover,.lang-dropdown.open .lang-btn{border-color:var(--pen);color:var(--pen)}
.lang-btn .lang-text{font-weight:500}
.lang-btn .ico-arrow{width:14px;height:14px;color:var(--muted);transition:transform .2s;flex-shrink:0}
.lang-dropdown.open .lang-btn .ico-arrow{transform:rotate(180deg)}
.flag-icon{width:18px;height:13px;object-fit:cover;border-radius:2px;border:1px solid rgba(0,0,0,.08);vertical-align:middle;flex-shrink:0;display:inline-block}
.lang-menu{position:absolute;top:calc(100% + 6px);right:0;min-width:170px;background:var(--paper);border:1px solid var(--line);border-radius:var(--r);box-shadow:0 14px 30px -10px rgba(29,36,51,.22);padding:6px;z-index:100;display:none}
.lang-dropdown.open .lang-menu{display:block}
.lang-opt{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:var(--r-sm);text-decoration:none;font:500 14px/1.2 var(--font);color:var(--ink)}
.lang-opt > span{display:flex;align-items:center;gap:8px}
.lang-opt:hover{background:var(--desk)}
.lang-opt.active{background:var(--pen-soft);color:var(--pen);font-weight:600}
.site-banner{background:var(--pen);color:#fff;font-size:14px;font-weight:500;padding:9px 16px;text-align:center}
.site-banner .banner-inner{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap}
.site-banner a{color:#fff;font-weight:600}
.menu-btn{display:none;align-items:center;gap:10px;background:none;border:1px solid var(--line);border-radius:var(--r-sm);padding:9px 12px;font:600 14px var(--font);color:var(--ink);cursor:pointer}
.menu-btn span,.menu-btn span::before,.menu-btn span::after{display:block;width:16px;height:2px;background:currentColor;border-radius:2px;position:relative}
.menu-btn span::before,.menu-btn span::after{content:"";position:absolute;left:0}
.menu-btn span::before{top:-5px}.menu-btn span::after{top:5px}
@media (max-width:980px){
  .bar{flex-wrap:wrap;min-height:60px;gap:12px}
  .menu-btn{display:inline-flex}
  .nav{display:none;flex-basis:100%;flex-direction:column;align-items:stretch;gap:12px;padding:0 0 16px}
  header.site.open .nav{display:flex}
  .nav-links{flex-direction:column;gap:0}
  .nav-links a{display:block;padding:14px 4px;border-bottom:1px solid var(--line)}
  .nav-links .nav-dropdown-toggle{display:flex!important}
  .nav-links a[aria-current="page"]{background:none;box-shadow:inset 3px 0 0 var(--lead);padding-left:14px}
  .nav-links > li > a[aria-current="page"]:not(.nav-dropdown-toggle),
  .nav-links > li > a.nav-dropdown-toggle[aria-current="page"] > span{text-decoration:none}
  .has-dropdown .sub-menu{position:static;display:block;box-shadow:none;border:0;border-radius:0;padding:0 0 6px 14px;background:none}
  .nav-links .sub-menu a{border-bottom:0;padding:10px 4px;color:var(--muted)}
  .nav-search,.nav-search:focus-within{width:100%;height:46px}
  .nav-search input{font-size:16px} /* ≥16px để iPhone không tự phóng to khi gõ */
  .lang-dropdown{align-self:flex-start}
}

/* ---------- Đầu trang chủ: vở ô li (điểm nhấn duy nhất) ---------- */
.hero{
  border-bottom:1px solid var(--line);
  background-color:var(--page);
  background-image:
    linear-gradient(var(--grid-strong) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-strong) 1px,transparent 1px),
    linear-gradient(var(--grid) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid) 1px,transparent 1px),
    var(--grain);
  background-size:32px 32px,32px 32px,8px 8px,8px 8px,160px 160px;
  background-position:-1px -1px;
  overflow:hidden;
}
.hero-inner{position:relative;padding-block:64px 56px}
.hero-inner::before{ /* lề đỏ của vở */
  content:"";position:absolute;top:-200px;bottom:-200px;left:-22px;width:2px;background:var(--margin-red);opacity:.75}
.hero h1{font:700 clamp(30px,4.6vw,50px)/1.18 var(--font);letter-spacing:-.025em;margin:0 0 14px;max-width:18ch;text-wrap:balance}
.hero p{font-size:clamp(16px,1.6vw,18px);color:var(--muted);margin:0 0 28px;max-width:52ch}
@media (max-width:700px){.hero-inner{padding-block:40px 36px}.hero-inner::before{left:-8px}}

/* ---------- Tìm kiếm ---------- */
.search-box{display:flex;align-items:center;max-width:640px;border:2px solid var(--ink);border-radius:var(--r);background:var(--paper)}
.search-box.wide{max-width:none;margin-bottom:28px}
.search-box input{flex:1;min-width:0;border:0;background:none;font:400 18px var(--font);padding:14px 16px;color:var(--ink)}
.search-box input::placeholder{color:#8f897d}
.search-box input:focus{outline:none}
.search-box:focus-within{border-color:var(--pen);box-shadow:0 0 0 4px var(--pen-soft)}
.search-box button{border:0;background:var(--pen);color:#fff;margin:5px;padding:9px 14px;border-radius:var(--r-sm);cursor:pointer;display:flex}
.search-box button:hover{background:var(--pen-dark)}
.search-box .ico{width:22px;height:22px}

/* ---------- Ô chuyên mục ---------- */
.cats{padding-block:36px 4px}
.cat-tiles{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:16px}
@media (max-width:1100px){.cat-tiles{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width:560px){.cat-tiles{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}}
.cat-tile{display:flex;flex-direction:column;overflow:hidden;background:var(--paper);text-decoration:none;color:var(--ink);box-shadow:var(--card-shadow);transition:box-shadow .15s}
.cat-tile:hover{box-shadow:var(--card-shadow-hover)}
.cat-tile:hover .cat-label{color:var(--pen)}
.cat-art{display:flex;align-items:center;justify-content:center;aspect-ratio:4/3;background:var(--paper);padding:6%;overflow:hidden}
.cat-art img{max-width:100%;max-height:100%;width:auto;height:auto}
.cat-art .ico{width:44%;height:auto;aspect-ratio:1}
.cat-initial{--dot:var(--lead);display:grid;place-items:center;width:46%;aspect-ratio:1;border-radius:50%;background:color-mix(in srgb,var(--dot) 14%,#fff);color:var(--dot);font:700 clamp(22px,3vw,34px)/1 var(--font)}
.cat-label{padding:10px 14px 12px;font:600 15px/1.3 var(--font);border-top:1px solid var(--line)}

/* ---------- Khối nội dung & thẻ ---------- */
.block{padding-block:40px 4px}
.block-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.block-head h2{display:flex;align-items:center;gap:10px;margin:0;font:700 24px/1.25 var(--font)}
.block-head h2 .ico{width:26px;height:26px}
.more{font-weight:600;font-size:15px;text-decoration:none;white-space:nowrap}
.more:hover{text-decoration:underline;text-underline-offset:3px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:20px}
@media (max-width:480px){.cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}}
.card{display:flex;flex-direction:column;min-width:0;background:var(--paper);overflow:hidden;color:var(--ink);text-decoration:none;box-shadow:var(--card-shadow);transition:box-shadow .15s}
.card:hover{box-shadow:var(--card-shadow-hover)}
.card:hover strong{color:var(--pen)}
/* tờ tranh đặt trên mặt bàn */
.thumb{position:relative;display:flex;align-items:center;justify-content:center;aspect-ratio:4/5;padding:5%;background:var(--paper);overflow:hidden}
.thumb img{max-width:100%;max-height:100%;width:auto;height:auto}
/* bộ tranh (chủ đề): xấp giấy nhiều tờ */
/* bộ tranh (chủ đề): xấp giấy – các tờ phía sau lộ ra ở mép phải/dưới của thẻ */
.card:has(> .thumb.stack){box-shadow:var(--card-shadow),5px 5px 0 -1px var(--paper),5px 5px 1px 0 rgba(29,36,51,.14),10px 10px 0 -1px var(--paper),10px 10px 1px 0 rgba(29,36,51,.10)}
.card:has(> .thumb.stack):hover{box-shadow:var(--card-shadow-hover),5px 5px 0 -1px var(--paper),5px 5px 1px 0 rgba(29,36,51,.14),10px 10px 0 -1px var(--paper),10px 10px 1px 0 rgba(29,36,51,.10)}
.thumb-empty{color:var(--muted);font-size:13px}
.card-body{display:flex;flex-direction:column;gap:2px;padding:12px 14px 14px;min-width:0;border-top:1px solid var(--line)}
.card-body strong{font:600 15.5px/1.35 var(--font);overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow-wrap:anywhere}
.card-body span{font-size:13.5px;color:var(--muted)}
.card-desc{font-size:13.5px;color:var(--muted);margin:4px 0 0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ---------- Trang danh sách / chủ đề / tranh ---------- */
.crumbs{font-size:14px;color:var(--muted);padding-top:22px}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--pen);text-decoration:underline}
.page-head{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px;align-items:end;padding-block:12px 28px;border-bottom:1px solid var(--line);margin-bottom:28px}
@media (max-width:700px){.page-head{grid-template-columns:minmax(0,1fr)}}
.page-head h1{font:700 clamp(28px,4vw,40px)/1.15 var(--font);margin:0 0 8px;text-wrap:balance}
.page-head p{color:var(--muted);margin:0;max-width:62ch}
.head-actions{display:flex;gap:10px;flex-wrap:wrap}
.sub-head{font:700 22px/1.25 var(--font);margin:0 0 16px}
.section-gap{margin-bottom:40px}
.with-ico{display:flex;align-items:center;gap:12px}
.with-ico .ico{width:36px;height:36px}
.color-dot{display:inline-block;width:12px;height:12px;border-radius:50%;background:var(--dot,var(--pen));flex:none}
.meta-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
.chip{display:inline-flex;align-items:center;gap:6px;font-size:13.5px;font-weight:500;background:var(--desk);color:var(--ink);border-radius:999px;padding:4px 12px;text-decoration:none}
a.chip:hover{background:var(--pen-soft);color:var(--pen)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:600 15px/1.2 var(--font);border-radius:var(--r-sm);padding:12px 18px;text-decoration:none;border:1px solid var(--line);color:var(--pen);background:var(--paper);cursor:pointer}
.btn:hover{border-color:var(--pen)}
.btn.primary{background:var(--pen);border-color:var(--pen);color:#fff}
.btn.primary:hover{background:var(--pen-dark);border-color:var(--pen-dark)}
.btn svg{width:18px;height:18px;fill:currentColor;flex:none}
.btn svg.ico-line,.ico-line{fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;width:19px;height:19px}
.detail{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:40px;align-items:start;padding-block:16px 10px}
@media (max-width:820px){.detail{grid-template-columns:minmax(0,1fr);gap:24px}}
.sheet-view{display:flex;align-items:center;justify-content:center;background:var(--paper);padding:4%;box-shadow:var(--card-shadow)}
.sheet-view img{display:block;max-width:100%;height:auto}
.side h1{font:700 clamp(28px,3.6vw,38px)/1.15 var(--font);margin:0 0 6px;text-wrap:balance}
.actions{display:flex;gap:10px;margin:24px 0;max-width:420px}
.actions .btn{flex:1 1 0;min-width:0;white-space:nowrap}
.tip{font-size:14.5px;color:var(--muted);border-left:3px solid var(--lead);padding:2px 0 2px 12px}
.ad{display:none} /* ô quảng cáo giữ chỗ: ẩn cho tới khi gắn mã quảng cáo thật */
.empty{text-align:center;color:var(--muted);padding:48px 16px;border:1px dashed var(--line);border-radius:var(--r);margin-block:10px;background:var(--desk)}
.empty .btn{margin-top:16px}
.empty.big{margin-block:48px}
.empty.big h1{font:700 64px/1 var(--font);color:var(--ink);margin:0 0 8px}

/* ---------- Tag & mùa lễ ---------- */
.tag-row{margin-top:10px}
.tag-chip::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--tag,var(--pen))}
.season-badge{display:inline-block;font:600 13px/1.2 var(--font);color:#fff;background:var(--lead);padding:4px 8px}
.season-block .block-head h2::before{content:"";width:12px;height:12px;border-radius:50%;background:var(--tag,var(--pen));flex:none}
.season-card .thumb{position:relative}
.season-badge.corner{position:absolute;top:10px;left:10px;font-size:12px;padding:3px 7px}

/* ---------- Blog ---------- */
.cat-pills{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:28px}
.post-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.post-card{display:flex;flex-direction:column;background:var(--paper);overflow:hidden;box-shadow:var(--card-shadow);transition:box-shadow .15s}
.post-card:hover{box-shadow:var(--card-shadow-hover)}
.post-cover{display:block;aspect-ratio:16/9;background:var(--desk)}
.post-cover img{width:100%;height:100%;object-fit:cover;display:block}
.post-body{display:flex;flex-direction:column;flex-grow:1;padding:18px 20px 20px}
.post-cat{font-size:13.5px;font-weight:600;color:var(--muted);text-decoration:none;display:inline-flex;align-items:center;gap:6px;margin-bottom:8px}
.post-body h2{font:700 19px/1.35 var(--font);margin:0 0 8px}
.post-body h2 a{color:var(--ink);text-decoration:none}
.post-body h2 a:hover{color:var(--pen)}
.post-body p{font-size:15px;color:var(--muted);margin:0 0 16px;flex-grow:1}
.post-meta{display:flex;align-items:center;gap:16px;font-size:13.5px;color:var(--muted);flex-wrap:wrap}
.post-meta .read{margin-left:auto;font-weight:600;text-decoration:none}
.article{max-width:760px;margin:0 auto}
.article-head{padding-block:12px 24px;border-bottom:1px solid var(--line);margin-bottom:28px}
.article-head h1{font:700 clamp(28px,4vw,40px)/1.2 var(--font);margin:8px 0 14px;text-wrap:balance}
.article-cover{overflow:hidden;background:var(--desk);aspect-ratio:16/9;margin-bottom:28px}
.article-cover img{width:100%;height:100%;object-fit:cover;display:block}
.lead{font-size:18px;line-height:1.6;color:var(--ink);border-left:3px solid var(--lead);padding-left:16px;margin:0 0 28px}
.article-body{font-size:17px;line-height:1.75;max-width:68ch}
.article-body h2{font:700 24px/1.3 var(--font);margin:36px 0 10px}
.article-body h3{font:700 19px/1.35 var(--font);margin:28px 0 8px}
.article-body img{border-radius:var(--r-sm);height:auto}
.article-body blockquote{margin:24px 0;padding:14px 18px;background:var(--desk);border-radius:var(--r-sm);border-left:3px solid var(--pen);color:var(--ink)}
.related{margin-top:48px;padding-top:28px;border-top:1px solid var(--line)}
.related-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}
.related-item{display:block;padding:14px 16px;text-decoration:none;color:var(--ink);background:var(--paper);box-shadow:var(--card-shadow);transition:box-shadow .15s}
.related-item:hover{box-shadow:var(--card-shadow-hover)}
.related-item h3{font:600 15.5px/1.4 var(--font);margin:0 0 6px}
.related-item span{font-size:13px;color:var(--muted)}

/* ---------- Footer ---------- */
footer.site{background:var(--desk) var(--grain);border-top:1px solid var(--line);margin-top:64px;font-size:15px}
.foot{display:flex;flex-wrap:wrap;gap:32px 48px;padding-block:44px 28px}
.foot > div{flex:1 1 150px;min-width:0}
.foot > .foot-brand{flex:2 1 300px}
.foot-brand .logo{margin-bottom:12px}
.foot-brand p{color:var(--muted);margin:0;max-width:44ch}
.foot h2{font:600 15px var(--font);color:var(--ink);margin:2px 0 12px;letter-spacing:0}
.foot h2 a{color:inherit;text-decoration:none}
.foot ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.foot a{color:var(--muted);text-decoration:none}
.foot a:hover{color:var(--pen);text-decoration:underline}
.foot li a{display:inline-flex;align-items:center;gap:8px}
.social-links{display:flex;gap:14px;margin-top:12px;font-size:14px}
.social-links a{font-weight:500}
.copy{border-top:1px solid var(--line);padding-block:16px 28px;color:var(--muted);font-size:13.5px}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* Câu hỏi thường gặp */
.faq{margin:48px 0 8px;max-width:820px}
.faq-item{border-top:1px solid var(--line,#e5e7eb)}
.faq-item:last-child{border-bottom:1px solid var(--line,#e5e7eb)}
.faq-item summary{cursor:pointer;list-style:none;padding:16px 36px 16px 0;font-weight:700;position:relative}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:6px;top:50%;transform:translateY(-50%);font-size:22px;font-weight:400;line-height:1}
.faq-item[open] summary::after{content:"\2212"}
.faq-item summary:focus-visible{outline:2px solid currentColor;outline-offset:2px}
.faq-a{padding:0 0 16px;color:var(--muted,#555)}
.faq-a p{margin:0 0 8px}
.faq-a ul,.faq-a ol{margin:0 0 8px;padding-left:22px}
.faq-a li{margin:2px 0}
.faq-a a{color:inherit;text-decoration:underline}