/* PickleballTrue — hệ thống giao diện "mềm".
   Bo góc tròn, bóng đổ nhẹ thay viền cứng, chữ thường thay vì in hoa.
   Be Vietnam Pro là font thiết kế riêng cho tiếng Việt, dấu không bị chồng. */
:root{
  --lime:#C8F02E;--lime-2:#D9F95E;--lime-deep:#A8D117;
  --navy:#0E1626;--navy-2:#18233A;--navy-3:#1F3A6B;
  --bg:#0E1626;--surface:#18233A;--surface-2:#223054;--surface-3:#2B3B63;
  --text:#F4F7FB;--text-2:#C9D2E0;--muted:#8A95A8;
  --line:rgba(255,255,255,.09);--line-2:rgba(255,255,255,.16);--accent-ink:#C8F02E;
  --tech:#6BA6FF;--rules:#B295FF;--news:#FF8A8A;
  --tech-bg:#2F6BD8;--rules-bg:#7B52D3;--news-bg:#D94A4A;
  --hdr-bg:#0E1626;--hdr-text:#F4F7FB;
  --shadow:0 10px 30px rgba(0,0,0,.28);--shadow-lg:0 20px 50px rgba(0,0,0,.36);
  --r-pill:999px;--r-card:18px;--r-md:12px;--r-sm:8px;
  --font:"Be Vietnam Pro","Segoe UI",system-ui,-apple-system,Roboto,"Noto Sans","Noto Sans JP","Noto Sans SC",sans-serif;
  --w:1260px;
}
[data-theme="light"]{
  --bg:#F7F8F5;--surface:#FFFFFF;--surface-2:#EFF1EC;--surface-3:#E4E8DF;
  --text:#141A24;--text-2:#3D4654;--muted:#6E7887;
  --line:rgba(14,22,38,.08);--line-2:rgba(14,22,38,.14);--accent-ink:#5E7A0C;
  --tech:#2F6BD8;--rules:#7B52D3;--news:#D94A4A;
  --shadow:0 8px 24px rgba(14,22,38,.08);--shadow-lg:0 18px 44px rgba(14,22,38,.12);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;transition:color .15s}
a:hover{color:var(--accent-ink)}
h1,h2,h3{margin:0;font-weight:800;letter-spacing:-.025em;line-height:1.18}
h1{font-size:clamp(2rem,4.2vw,3.4rem)}
h2{font-size:clamp(1.5rem,2.4vw,2rem)}
h3{font-size:1.2rem;font-weight:700;letter-spacing:-.015em;line-height:1.3}
.wrap{max-width:var(--w);margin:0 auto;padding:0 1.25rem}
.muted{color:var(--muted)}
.small{font-size:.86rem}
.skip{position:absolute;left:-999px;top:0;background:var(--lime);color:var(--navy);padding:.6rem 1.2rem;border-radius:var(--r-pill)}
.skip:focus{left:1rem;z-index:99}
.kicker{display:flex;align-items:center;gap:.6rem;font-size:.8rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent-ink);margin:0}
.kicker::before{content:"";width:26px;height:2px;background:var(--lime);border-radius:2px;flex-shrink:0}
.eyebrow{font-size:.78rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase}

/* Header */
.hdr{background:var(--hdr-bg);color:var(--hdr-text);position:sticky;top:0;z-index:50}
[data-theme="light"] .hdr{box-shadow:0 1px 0 rgba(14,22,38,.07)}
.hdr-in{display:flex;align-items:center;gap:1rem;height:72px}
.logo{display:flex;align-items:center;gap:.6rem;font-size:1.4rem;font-weight:800;letter-spacing:-.03em;white-space:nowrap}
.logo em{font-style:normal;color:var(--lime)}
.logo:hover{color:var(--hdr-text)}
.nav{display:flex;gap:.2rem;font-size:.98rem;font-weight:600}
.nav a{padding:.55rem 1rem;border-radius:var(--r-sm);color:#AEB8C8;transition:background .15s,color .15s}
.nav a:hover{background:var(--navy-2);color:var(--lime)}
.nav a.on{background:rgba(200,240,46,.14);color:var(--lime)}
.tools{margin-left:auto;display:flex;align-items:center;gap:.5rem}
.srch{display:flex;align-items:center;background:var(--navy-2);border-radius:var(--r-pill);height:42px;padding:0 .35rem 0 1rem}
.srch input{background:none;border:0;color:#fff;font:inherit;font-size:.92rem;width:160px;outline:0}
.srch input::placeholder{color:#7D8798}
.srch button{background:var(--lime);color:var(--navy);border:0;width:32px;height:32px;border-radius:var(--r-pill);display:grid;place-items:center;cursor:pointer;transition:background .15s}
.srch button:hover{background:var(--lime-2)}
details.lang,details.menu{position:relative}
.hdr details summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:.3rem;height:42px;padding:0 .95rem;background:var(--navy-2);border-radius:var(--r-pill);font-weight:600;font-size:.88rem;transition:background .15s}
.hdr details summary:hover{background:var(--surface-2)}
.hdr details summary::-webkit-details-marker{display:none}
summary{list-style:none}
summary::-webkit-details-marker{display:none}
details.lang ul,details.menu ul{position:absolute;right:0;top:50px;margin:0;padding:.4rem;list-style:none;background:var(--surface);color:var(--text);border-radius:var(--r-md);min-width:200px;box-shadow:var(--shadow-lg);z-index:60}
details.lang li a,details.menu li a{display:block;padding:.6rem .85rem;border-radius:var(--r-sm);font-size:.95rem;font-weight:500}
details.lang li a:hover,details.menu li a:hover{background:var(--surface-2);color:var(--text)}
details.lang li a.on{background:var(--lime);color:var(--navy);font-weight:700}
details.menu li a{font-weight:600}
.theme{background:var(--navy-2);border:0;color:#fff;width:42px;height:42px;border-radius:var(--r-pill);display:grid;place-items:center;cursor:pointer;transition:background .15s}
.theme:hover{background:var(--surface-2)}
.theme .sun{display:none}
[data-theme="light"] .theme .sun{display:block}
[data-theme="light"] .theme .moon{display:none}
details.menu{display:none}
.menu-langs{display:flex;flex-wrap:wrap;gap:.25rem;border-top:1px solid var(--line);margin-top:.4rem;padding-top:.4rem}
details.menu li.menu-langs a{font-size:.84rem;padding:.4rem .6rem}
.mnav{display:none}
@media (max-width:1000px){
  .nav{display:none}
  details.menu{display:block}
  .srch input{width:110px}
  .hdr-in{height:64px;gap:.6rem}
  .logo{font-size:1.2rem}
  .mnav{display:flex;gap:.5rem;padding:1rem 0 0;overflow-x:auto;scrollbar-width:none;font-size:.9rem;font-weight:600}
  .mnav::-webkit-scrollbar{display:none}
  .mnav a{padding:.5rem 1rem;border-radius:var(--r-pill);background:var(--surface);white-space:nowrap;box-shadow:var(--shadow)}
  .mnav a.on{background:var(--lime);color:var(--navy)}
}
@media (max-width:560px){.srch{display:none}details.lang{display:none}.logo{font-size:1.1rem}}

/* Hero */
.hero{display:grid;grid-template-columns:1.3fr 1fr;margin:2rem 0 2.5rem;background:var(--surface);border-radius:var(--r-card);overflow:hidden;box-shadow:var(--shadow)}
.hero-body{padding:2.5rem 2.25rem;display:flex;flex-direction:column;justify-content:center;gap:1rem;order:2}
.hero h1 .acc{color:var(--accent-ink)}
.hero .lead{font-size:1.08rem;line-height:1.6;color:var(--muted);max-width:32rem;margin:0}
.hero-cta{display:flex;align-items:center;gap:1.1rem;flex-wrap:wrap;margin-top:.35rem}
.hero-img{position:relative;min-height:340px;order:1;overflow:hidden}
.hero-img img{width:100%;height:100%;object-fit:cover}
.hero-img .court{position:absolute;inset:0}
.hero-tip{position:absolute;left:1.25rem;bottom:1.25rem;right:1.25rem;background:var(--surface);border-radius:var(--r-md);padding:.9rem 1.1rem;box-shadow:var(--shadow-lg)}
.hero-tip .eyebrow{color:var(--accent-ink)}
.hero-tip p{margin:.2rem 0 0;font-size:.92rem;line-height:1.5;color:var(--text-2)}
.btn{display:inline-flex;align-items:center;gap:.5rem;font-size:1rem;font-weight:700;padding:.8rem 1.6rem;background:var(--lime);color:var(--navy);border-radius:var(--r-pill);transition:transform .15s,background .15s,box-shadow .15s}
.btn:hover{background:var(--lime-2);color:var(--navy);transform:translateY(-1px);box-shadow:0 8px 20px rgba(200,240,46,.24)}
.hero-empty{grid-template-columns:1fr;text-align:center;padding:3rem 1rem}
.hero-empty .hero-body{align-items:center}
@media (max-width:900px){
  .hero{grid-template-columns:1fr;margin:1rem 0 1.75rem}
  .hero-body{padding:1.5rem 1.35rem;order:2}
  .hero-img{min-height:220px;order:1}
  .hero-tip{display:none}
}

/* Nền sân dự phòng khi bài chưa có ảnh */
.court{display:block;width:100%;height:100%;background:linear-gradient(150deg,#1F3A6B,#132242);position:relative;overflow:hidden}
.court svg{position:absolute;inset:0;width:100%;height:100%}

/* Thanh tin chạy */
.ticker{display:flex;align-items:center;gap:1rem;padding:.7rem 1.1rem;background:var(--surface);border-radius:var(--r-pill);font-weight:600;font-size:.92rem;margin:0 0 2.5rem;box-shadow:var(--shadow);overflow:hidden}
.ticker .eyebrow{color:var(--accent-ink);flex-shrink:0}
/* Vùng cắt riêng: nếu thiếu, dải chữ trượt đè lên nhãn bên trái. */
.ticker-win{flex:1;min-width:0;overflow:hidden;-webkit-mask-image:linear-gradient(90deg,transparent,#000 2rem,#000 calc(100% - 2rem),transparent);mask-image:linear-gradient(90deg,transparent,#000 2rem,#000 calc(100% - 2rem),transparent)}
.ticker-track{display:flex;gap:1.25rem;white-space:nowrap;width:max-content;animation:ticker 45s linear infinite}
.ticker-track span.sep{color:var(--lime);opacity:.7}
.ticker a:hover{color:var(--accent-ink)}
@keyframes ticker{from{transform:translateX(0)}to{transform:translateX(-50%)}}
@media (prefers-reduced-motion:reduce){.ticker-track{animation:none}}

/* Mục & thẻ bài */
.sec{margin:0 0 3rem}
.sec-hd{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;margin-bottom:1.25rem}
.more{font-size:.92rem;font-weight:700;color:var(--accent-ink);white-space:nowrap}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.4rem}
.grid-4{grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.card{background:var(--surface);border-radius:var(--r-card);overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow);transition:transform .18s,box-shadow .18s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.card-img{aspect-ratio:16/9;display:block;position:relative;overflow:hidden;background:var(--surface-2)}
.card-img img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.card:hover .card-img img{transform:scale(1.03)}
.card-body{padding:1.1rem 1.25rem 1.35rem;display:flex;flex-direction:column;gap:.5rem}
.card-body h3 a:hover{color:var(--accent-ink)}
.card-body p{margin:0}
.meta{color:var(--muted);font-size:.85rem;margin:0;font-weight:500}
@media (max-width:640px){
  .grid,.grid-4{grid-template-columns:1fr;gap:.9rem}
  .card{display:grid;grid-template-columns:110px 1fr;align-items:stretch}
  .card-img{aspect-ratio:auto;min-height:100%}
  .card-body{padding:.85rem 1rem .85rem .9rem;justify-content:center;gap:.35rem}
  .card-body h3{font-size:1rem}
  .card-body p.muted{display:none}
}

/* Nhãn & chip */
.badge{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.04em;padding:.3rem .7rem;border-radius:var(--r-sm);color:#fff;background:var(--navy-3);width:max-content}
.badge-technique{background:var(--tech-bg)}
.badge-rules{background:var(--rules-bg)}
.badge-news{background:var(--news-bg)}
.chips{display:flex;flex-wrap:wrap;gap:.55rem;margin-top:.6rem}
.chip{display:inline-flex;align-items:center;min-height:40px;padding:0 1.05rem;background:var(--surface);border-radius:var(--r-pill);font-size:.92rem;font-weight:600;box-shadow:var(--shadow);transition:background .15s,color .15s,transform .15s}
.chip:hover{background:var(--lime);color:var(--navy);transform:translateY(-1px)}
.chip-lime{background:var(--lime);color:var(--navy)}

/* Trang danh sách */
.page-hd{padding:2.25rem 0 1.5rem;margin-bottom:1.75rem;display:flex;flex-direction:column;gap:.75rem;border-bottom:1px solid var(--line)}
.lead{font-size:1.08rem;color:var(--muted);margin:0;max-width:42rem;line-height:1.6}
.empty{padding:4rem 0;text-align:center;color:var(--muted)}
.pager{display:flex;justify-content:space-between;align-items:center;margin:2.5rem 0;font-weight:600;font-size:.95rem}
.pager a{background:var(--surface);padding:.6rem 1.2rem;border-radius:var(--r-pill);box-shadow:var(--shadow)}
.pager a:hover{background:var(--lime);color:var(--navy)}

/* Bài viết */
.post-hd{padding:2rem 0 0;display:flex;flex-direction:column;gap:.9rem;max-width:52rem}
.crumbs{font-size:.88rem;color:var(--muted);display:flex;flex-wrap:wrap;gap:.45rem;font-weight:500}
.crumbs .cur{color:var(--text-2)}
.post-hd h1{font-size:clamp(1.9rem,4vw,3rem)}
.post-hd h1 .acc{color:var(--accent-ink)}
.post-hd .lead{font-size:1.15rem;max-width:44rem}
.post-meta{display:flex;align-items:center;flex-wrap:wrap;gap:.75rem;color:var(--muted);font-size:.9rem;font-weight:500}
.post-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--muted)}
.tag-ai{padding:.3rem .75rem;background:var(--surface);border-radius:var(--r-pill);font-size:.78rem;font-weight:600;box-shadow:var(--shadow)}
.note-ai{font-size:.9rem;color:var(--muted);background:var(--surface);border-radius:var(--r-md);padding:.8rem 1.1rem;margin:0 0 1.5rem}
.post-cover{margin:1.75rem 0 0;height:clamp(200px,30vw,400px);overflow:hidden;border-radius:var(--r-card);box-shadow:var(--shadow)}
.post-cover img{width:100%;height:100%;object-fit:cover}
.post-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:3.5rem;padding:2.5rem 0 1rem}
.post-side{display:flex;flex-direction:column;gap:1.4rem;align-self:start;position:sticky;top:92px}
.toc{background:var(--surface);border-radius:var(--r-card);padding:1.25rem 1.4rem;display:flex;flex-direction:column;gap:.7rem;box-shadow:var(--shadow)}
.toc-hd{margin:0;font-size:.78rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent-ink)}
.toc ol{margin:0;padding:0;list-style:none;counter-reset:toc;display:flex;flex-direction:column;gap:.5rem}
.toc ol li{counter-increment:toc;font-weight:500;font-size:.96rem;color:var(--text-2)}
.toc ol li>a::before{content:counter(toc,decimal-leading-zero) ". ";color:var(--accent-ink);font-weight:700}
.toc ol ol{margin:.35rem 0 0 1.2rem;gap:.3rem;counter-reset:none}
.toc ol ol li{counter-increment:none;font-size:.9rem;color:var(--muted)}
.toc ol ol li>a::before{content:"— "}
.tip{background:var(--surface);border-radius:var(--r-card);padding:1.15rem 1.35rem;display:flex;flex-direction:column;gap:.3rem;box-shadow:var(--shadow);border-left:4px solid var(--lime)}
.tip-hd{margin:0;font-size:.78rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent-ink)}
.tip p{margin:0;font-size:.98rem;line-height:1.6;color:var(--text-2)}
.side-tags{display:flex;flex-direction:column;gap:.5rem}
.side-tags .eyebrow{color:var(--muted)}
.side-tags .chips{margin:0}
.side-tags .chip{min-height:34px;font-size:.86rem;padding:0 .85rem}
.post-main{max-width:44rem;min-width:0}
.prose{font-size:1.1rem;line-height:1.8;color:var(--text-2);counter-reset:h2}
.prose>*:first-child{margin-top:0}
.prose h2{counter-increment:h2;font-size:clamp(1.4rem,2.4vw,1.9rem);color:var(--text);margin:2.5rem 0 .9rem;display:flex;gap:.6rem;align-items:baseline}
.prose h2::before{content:counter(h2,decimal-leading-zero);color:var(--accent-ink);font-size:.78em;font-weight:800}
.prose h3{font-size:1.2rem;color:var(--text);margin:1.75rem 0 .5rem}
.prose p,.prose ul,.prose ol{margin:0 0 1.2rem}
.prose li{margin:.4rem 0}
.prose ol{list-style:none;padding:0;counter-reset:step}
.prose ol>li{counter-increment:step;display:flex;gap:.9rem;align-items:baseline}
.prose ol>li::before{content:counter(step);display:grid;place-items:center;min-width:1.6rem;height:1.6rem;background:var(--lime);color:var(--navy);border-radius:var(--r-pill);font-size:.85rem;font-weight:700;flex-shrink:0}
.prose ul{padding-left:1.3rem}
.prose strong{color:var(--text);font-weight:700}
.prose a{color:var(--accent-ink);text-decoration:underline;text-underline-offset:3px}
.prose img{margin:1.5rem 0;border-radius:var(--r-card);box-shadow:var(--shadow)}
.prose blockquote{margin:1.5rem 0;padding:1rem 1.4rem;border-radius:var(--r-md);background:var(--surface);color:var(--text-2);border-left:4px solid var(--lime)}
.prose table{width:100%;border-collapse:separate;border-spacing:0;font-size:.98rem;margin:1.4rem 0;display:block;overflow-x:auto;background:var(--surface);border-radius:var(--r-md)}
.prose th,.prose td{padding:.8rem 1.1rem;text-align:left;border-bottom:1px solid var(--line)}
.prose th{font-size:.8rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--accent-ink)}
.prose tr:last-child td{border-bottom:0}
.prose code{background:var(--surface-2);padding:.15rem .4rem;border-radius:6px;font-size:.92em}
.faq{margin:2.5rem 0 0}
.faq details{background:var(--surface);border-radius:var(--r-md);margin:.65rem 0;padding:0 1.35rem;box-shadow:var(--shadow)}
.faq summary{cursor:pointer;font-weight:600;font-size:1.05rem;padding:1.05rem 0;display:flex;justify-content:space-between;align-items:center;gap:1rem;min-height:44px}
.faq summary::after{content:"+";color:var(--accent-ink);font-size:1.4rem;font-weight:700;line-height:1}
.faq details[open] summary::after{content:"–"}
.faq .prose{font-size:1rem;padding-bottom:1rem}
.sources{margin:2.5rem 0 0;font-size:.94rem;color:var(--muted)}
.sources ul{padding-left:1.2rem;margin:0}
.sources a{color:var(--accent-ink);text-decoration:underline}
.post-tags{display:flex;flex-wrap:wrap;gap:.55rem;margin:2rem 0 0}
@media (max-width:960px){
  .post-layout{grid-template-columns:1fr;gap:1.75rem;padding-top:1.5rem}
  .post-side{position:static}
  .side-tags{display:none}
  .prose{font-size:1.04rem}
}
@media (min-width:961px){.post-tags{display:none}}

/* Thuật ngữ */
.gl-group{margin:2rem 0}
.gl-group h2{color:var(--accent-ink);display:flex;align-items:center;gap:1rem}
.gl-group h2::after{content:"";flex:1;height:1px;background:var(--line)}
.gl-list{list-style:none;margin:1rem 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:.8rem}
.gl-list li{background:var(--surface);border-radius:var(--r-md);padding:1rem 1.2rem;display:flex;flex-direction:column;gap:.25rem;box-shadow:var(--shadow);transition:transform .15s}
.gl-list li:hover{transform:translateY(-2px)}
.gl-list li a{font-weight:700;font-size:1.05rem}
.gl-list li a:hover{color:var(--accent-ink)}
.gl-list .muted{font-size:.9rem}

/* Chân trang */
.ftr{background:var(--navy);color:#9AA4B4;margin-top:4rem;padding:2.75rem 0 1.5rem}
[data-theme="light"] .ftr{background:var(--navy)}
.ftr-in{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:2rem;margin-bottom:1.5rem}
.ftr-brand{font-size:1.35rem;font-weight:800;letter-spacing:-.03em;color:#F4F7FB;margin:0 0 .4rem}
.ftr-brand em{font-style:normal;color:var(--lime)}
.ftr .muted{color:#9AA4B4}
.ftr-links,.ftr-langs{display:flex;flex-direction:column;gap:.5rem;font-size:.95rem}
.ftr-links a{font-weight:600}
.ftr a:hover{color:var(--lime)}
@media (max-width:760px){.ftr-in{grid-template-columns:1fr}.ftr-links,.ftr-langs{flex-direction:row;flex-wrap:wrap;gap:.75rem 1.1rem}}