/* =====================================================================
   AI BOS Community OS — AI BOS Light Community Theme (default)
   Clean Community SaaS meets Notion-style Workspace.
   Sáng · gọn · dễ đọc · nhiều khoảng trắng · cam tiết chế.
   KHÔNG copy Skool/Notion — chỉ lấy cảm giác sản phẩm.
   ===================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root{
  /* Surfaces */
  --background:#F7F7F5;
  --surface:#FFFFFF;
  --surface-muted:#F3F3F1;
  --sidebar-bg:#F8F8F6;
  --sidebar-active:#EFEDEA;
  --sidebar-hover:#F1F0ED;

  /* Borders */
  --border:#E5E2DC;
  --border-strong:#D6D2CA;

  /* Text */
  --text-primary:#171717;
  --text-secondary:#555555;
  --text-muted:#8A8A8A;
  --text-disabled:#B5B5B5;

  /* Accent (AI BOS orange — tiết chế) */
  --accent:#cc6600;
  --accent-hover:#a35200;
  --accent-soft:#FFF2E5;
  --accent-border:#F0C399;

  /* Status */
  --success:#22C55E; --success-strong:#15803D; --success-soft:#ECFDF3; --success-border:#BBF7D0;
  --warning:#D97706; --warning-soft:#FFF7ED;
  --danger:#DC2626;  --danger-soft:#FEF2F2;
  --admin-bg:#171717; --admin-text:#FFFFFF;

  /* Shape & depth */
  --radius-sm:8px; --radius-md:12px; --radius-lg:16px; --radius-xl:22px;
  --shadow-soft:0 1px 2px rgba(0,0,0,0.04);
  --shadow-card:0 8px 24px rgba(0,0,0,0.06);
  --shadow-pop:0 12px 36px rgba(0,0,0,0.12);

  --font:'Inter',ui-sans-serif,system-ui,-apple-system,Segoe UI,Arial,sans-serif;
  --sidebar-w:248px;
  --topbar-h:62px;

  /* aliases để code dùng chung tên ngắn */
  --bg:var(--background);
  --line:var(--border);
  --line-soft:var(--border-strong);
  --text:var(--text-primary);
  --muted:var(--text-secondary);
  --muted-2:var(--text-muted);
  --orange:var(--accent); --orange-deep:var(--accent-hover);
  --orange-soft:var(--accent-hover); --orange-glow:var(--accent-soft);
  --green:var(--success); --green-soft:var(--success-soft);
  --surface-2:var(--surface-muted); --surface-3:#ECEBE7;
}

*{box-sizing:border-box;margin:0;padding:0}
svg{flex:0 0 auto}
.nav-item__ic{display:inline-flex;align-items:center;justify-content:center}
.btn svg,.icon-btn svg,.section-head svg,.pill svg,.search svg{display:block}
.btn svg{margin-right:-2px}
.ico-line{display:inline-flex;align-items:center;justify-content:center;color:var(--text-secondary)}
.ico-accent{color:var(--accent)}
.tile__ico{width:40px;height:40px;border-radius:11px;background:var(--surface-muted);display:grid;place-items:center;color:var(--text-secondary)}
.tile__ico--accent{background:var(--accent-soft);color:var(--accent-hover)}
html,body{height:100%}
body{
  font-family:var(--font);background:var(--background);color:var(--text-primary);
  font-size:14px;line-height:1.55;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:#DAD7D0;border-radius:8px}
::-webkit-scrollbar-track{background:transparent}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ---------- App Shell ---------- */
.shell{display:grid;grid-template-columns:var(--sidebar-w) 1fr;min-height:100vh}

.sidebar{
  background:var(--sidebar-bg);border-right:1px solid var(--border);
  display:flex;flex-direction:column;position:sticky;top:0;height:100vh;overflow:hidden;
}
.sidebar__brand{display:flex;align-items:center;gap:10px;padding:17px 18px 14px;border-bottom:1px solid var(--border)}
.brandmark{
  width:34px;height:34px;border-radius:9px;flex:0 0 auto;
  background:var(--accent);display:grid;place-items:center;font-weight:800;color:#fff;font-size:15px;
}
.brandmark--green{background:var(--success)}
.sidebar__title{font-weight:700;font-size:14px;letter-spacing:-.01em;line-height:1.15}
.sidebar__title small{display:block;color:var(--text-muted);font-weight:500;font-size:11px}
.sidebar__nav{flex:1;overflow-y:auto;padding:10px 10px 20px}
.nav-group{margin-top:13px}
.nav-group__label{font-size:10.5px;text-transform:uppercase;letter-spacing:.07em;color:var(--text-muted);padding:6px 12px 4px;font-weight:600}
.nav-item{
  display:flex;align-items:center;gap:11px;padding:8px 12px;border-radius:var(--radius-sm);
  color:var(--text-secondary);font-weight:500;font-size:13.5px;margin-bottom:2px;
  transition:background .14s,color .14s;cursor:pointer;
}
.nav-item:hover{background:var(--sidebar-hover);color:var(--text-primary)}
.nav-item.active{background:var(--accent-soft);color:var(--accent-hover);font-weight:600}
.nav-item__ic{width:18px;text-align:center;font-size:15px;flex:0 0 auto}
.nav-item__badge{margin-left:auto;background:var(--accent);color:#fff;font-size:10px;font-weight:700;padding:1px 7px;border-radius:20px}
.nav-item__badge--green{background:var(--success)}
.nav-group--col .nav-group__toggle{display:flex;align-items:center;justify-content:space-between;cursor:pointer;user-select:none}
.nav-group__chev{display:inline-flex;transition:transform .18s;color:var(--text-muted)}
.nav-group--col.is-collapsed .nav-group__chev{transform:rotate(-90deg)}
.nav-group--col.is-collapsed .nav-group__items{display:none}
.kbd{display:inline-flex;gap:2px;font-size:10px;border:1px solid var(--border);border-radius:5px;padding:1px 5px;color:var(--text-muted);background:var(--surface-muted)}
.demo-note{display:inline-flex;align-items:center;gap:6px;font-size:11.5px;font-weight:600;color:var(--warning);background:var(--warning-soft);border:1px solid #FBD9A8;padding:3px 9px;border-radius:20px}
.cmdk{position:fixed;inset:0;z-index:130;display:flex;justify-content:center;padding-top:12vh;background:rgba(23,23,23,.34);backdrop-filter:blur(2px)}
.cmdk__box{width:100%;max-width:560px;height:max-content;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-pop);overflow:hidden}
.cmdk__in{width:100%;border:none;border-bottom:1px solid var(--border);padding:15px 18px;font-size:15px;outline:none;color:var(--text-primary);background:none}
.cmdk__list{max-height:52vh;overflow-y:auto;padding:6px}
.cmdk__item{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:10px;cursor:pointer}
.cmdk__item:hover,.cmdk__item.sel{background:var(--surface-muted)}
.cmdk__type{margin-left:auto;font-size:11px;color:var(--text-muted)}

/* ---------- Topbar ---------- */
.main{display:flex;flex-direction:column;min-width:0}
.topbar{
  height:var(--topbar-h);position:sticky;top:0;z-index:40;
  background:rgba(255,255,255,.85);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:14px;padding:0 22px;
}
.topbar__menu{display:none;background:var(--surface);border:1px solid var(--border);color:var(--text-primary);width:38px;height:38px;border-radius:10px;font-size:18px}
.search{
  flex:1;max-width:440px;display:flex;align-items:center;gap:9px;
  background:var(--surface-muted);border:1px solid var(--border);border-radius:12px;padding:9px 13px;
}
.search input{flex:1;background:none;border:none;color:var(--text-primary);font-size:13.5px;outline:none}
.search input::placeholder{color:var(--text-muted)}
.topbar__spacer{flex:1}
.icon-btn{
  position:relative;width:40px;height:40px;border-radius:11px;border:1px solid var(--border);
  background:var(--surface);color:var(--text-primary);font-size:17px;display:grid;place-items:center;
  transition:border-color .14s,background .14s;
}
.icon-btn:hover{border-color:var(--border-strong);background:var(--surface-muted)}
.icon-btn .dot{position:absolute;top:8px;right:9px;width:8px;height:8px;border-radius:50%;background:var(--accent);border:2px solid var(--surface)}
.avatar{
  width:40px;height:40px;border-radius:50%;background:var(--accent-soft);
  border:1px solid var(--accent-border);display:grid;place-items:center;font-weight:700;color:var(--accent-hover);font-size:14px;
}
.avatar--sm{width:34px;height:34px;font-size:12px}
.avatar--lg{width:64px;height:64px;font-size:22px}

/* ---------- Content ---------- */
.content{padding:26px 28px 60px;max-width:1280px;width:100%;margin:0 auto}
.page-head{display:flex;align-items:flex-start;gap:14px;flex-wrap:wrap;margin-bottom:22px}
.page-head h1{font-size:26px;font-weight:800;letter-spacing:-.02em}
.page-head p{color:var(--text-secondary);font-size:13.5px;margin-top:3px}
.page-head__actions{margin-left:auto;display:flex;gap:10px;flex-wrap:wrap}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:var(--radius-md);padding:10px 16px;font-weight:600;font-size:13.5px;border:1px solid transparent;transition:.14s;white-space:nowrap}
.btn--primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn--primary:hover{background:var(--accent-hover);border-color:var(--accent-hover)}
.btn--ghost{background:var(--surface);color:var(--text-primary);border-color:var(--border-strong)}
.btn--ghost:hover{background:var(--surface-muted)}
.btn--soft{background:transparent;color:var(--text-secondary)}
.btn--soft:hover{background:var(--sidebar-hover)}
.btn--green{background:var(--success);color:#fff;border-color:var(--success)}
.btn--sm{padding:7px 12px;font-size:12.5px;border-radius:10px}
.btn--block{width:100%;justify-content:center}

/* ---------- Cards / grid ---------- */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:18px;box-shadow:var(--shadow-soft)}
.card--pad-lg{padding:22px}
.card:hover{}
.grid{display:grid;gap:16px}
.g-2{grid-template-columns:repeat(2,1fr)}
.g-3{grid-template-columns:repeat(3,1fr)}
.g-4{grid-template-columns:repeat(4,1fr)}
.stack{display:flex;flex-direction:column;gap:16px}
.row{display:flex;gap:16px;align-items:flex-start}
.dash-grid{display:grid;grid-template-columns:2fr 1fr;gap:18px;align-items:start}

/* ---------- Stat card ---------- */
.stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:16px 18px;box-shadow:var(--shadow-soft)}
.stat__ic{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;font-size:18px;background:var(--surface-muted);margin-bottom:12px}
.stat__ic--orange{background:var(--accent-soft);color:var(--accent-hover)}
.stat__ic--green{background:var(--success-soft);color:var(--success-strong)}
.stat__val{font-size:25px;font-weight:800;letter-spacing:-.02em;line-height:1}
.stat__label{color:var(--text-secondary);font-size:12.5px;margin-top:6px}
.stat__delta{font-size:11.5px;font-weight:600;margin-top:8px}
.up{color:var(--success-strong)} .down{color:var(--danger)}

/* ---------- Section header ---------- */
.section-head{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.section-head h2{font-size:17px;font-weight:700;letter-spacing:-.01em}
.section-head a{margin-left:auto;color:var(--accent-hover);font-size:12.5px;font-weight:600}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;border-radius:var(--radius-xl);padding:28px 30px;
  background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow-soft);
}
.hero::before{content:'';position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--accent)}
.hero h1{font-size:30px;font-weight:800;letter-spacing:-.025em}
.hero p{color:var(--text-secondary);max-width:580px;margin:10px 0 20px;font-size:14.5px}
.hero__cta{display:flex;gap:12px;flex-wrap:wrap}
.hero__badge{display:inline-flex;align-items:center;gap:7px;background:var(--success-soft);color:var(--success-strong);border:1px solid var(--success-border);font-size:12px;font-weight:600;padding:5px 12px;border-radius:20px;margin-bottom:14px}
.pulse{width:7px;height:7px;border-radius:50%;background:var(--success);animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(34,197,94,.45)}70%{box-shadow:0 0 0 7px rgba(34,197,94,0)}100%{box-shadow:0 0 0 0 rgba(34,197,94,0)}}

/* ---------- Pills / tags ---------- */
.pill{display:inline-flex;align-items:center;gap:6px;font-size:11.5px;font-weight:600;padding:4px 10px;border-radius:20px;background:var(--surface-muted);color:var(--text-secondary);border:1px solid var(--border)}
.pill--orange{background:var(--accent-soft);color:var(--accent-hover);border-color:var(--accent-border)}
.pill--green{background:var(--success-soft);color:var(--success-strong);border-color:var(--success-border)}
.pill--lock{background:var(--surface-muted);color:var(--text-muted)}
.pill--admin{background:var(--admin-bg);color:var(--admin-text);border-color:var(--admin-bg)}
.pill.is-active{background:var(--accent);color:#fff;border-color:var(--accent)}

/* ---------- Post card ---------- */
.post{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:16px 18px;transition:border-color .14s,box-shadow .14s;box-shadow:var(--shadow-soft)}
.post:hover{border-color:var(--border-strong)}
.post__head{display:flex;align-items:center;gap:11px;margin-bottom:11px}
.post__meta{font-size:12px;color:var(--text-muted)}
.post__meta b{color:var(--text-primary);font-weight:600}
.post__title{font-weight:700;font-size:16px;margin-bottom:6px;letter-spacing:-.01em}
.post__body{color:var(--text-secondary);font-size:13.5px}
.post__foot{display:flex;align-items:center;gap:18px;margin-top:13px;color:var(--text-muted);font-size:12.5px}
.post__foot span{display:inline-flex;align-items:center;gap:6px;cursor:pointer}
.post__foot span:hover{color:var(--text-primary)}

/* ---------- List rows ---------- */
.lrow{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid var(--border)}
.lrow:last-child{border-bottom:none}
.lrow__main{flex:1;min-width:0}
.lrow__title{font-weight:600;font-size:13.5px}
.lrow__sub{color:var(--text-secondary);font-size:12px;margin-top:2px}
.rank{width:26px;height:26px;border-radius:8px;display:grid;place-items:center;font-weight:700;font-size:12px;background:var(--surface-muted);color:var(--text-secondary)}
.rank--1{background:var(--accent);color:#fff}
.rank--2{background:var(--border-strong);color:var(--text-primary)}
.rank--3{background:var(--accent-soft);color:var(--accent-hover)}

/* ---------- Progress ---------- */
.progress{height:7px;background:var(--surface-muted);border-radius:20px;overflow:hidden}
.progress__bar{height:100%;background:var(--accent);border-radius:20px}
.progress--green .progress__bar{background:var(--success)}

/* ---------- Level badge ---------- */
.level{display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:600;color:var(--accent-hover)}
.level__chip{width:22px;height:22px;border-radius:6px;background:var(--accent-soft);color:var(--accent-hover);display:grid;place-items:center;font-size:11px;font-weight:700}
.badge-ic{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;font-size:20px;background:var(--surface-muted);opacity:.55}
.badge-ic.earned{background:var(--accent-soft);opacity:1}

/* ---------- Course / agent card ---------- */
.tile{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;display:flex;flex-direction:column;transition:.14s;box-shadow:var(--shadow-soft)}
.tile:hover{border-color:var(--border-strong);box-shadow:var(--shadow-card)}
.tile__cover{height:96px;background:var(--surface-muted);position:relative;display:grid;place-items:center;font-size:34px}
.tile__cover--orange{background:var(--accent-soft)}
.tile__cover--green{background:var(--success-soft)}
.tile__lock{position:absolute;top:10px;right:10px}
.tile__body{padding:15px 16px;flex:1;display:flex;flex-direction:column;gap:8px}
.tile__title{font-weight:700;font-size:15px;letter-spacing:-.01em}
.tile__desc{color:var(--text-secondary);font-size:12.5px;flex:1}
.tile__foot{display:flex;align-items:center;gap:8px;margin-top:4px}

/* ---------- Table ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:13px}
.tbl th{text-align:left;color:var(--text-muted);font-weight:600;font-size:11.5px;text-transform:uppercase;letter-spacing:.04em;padding:11px 12px;border-bottom:1px solid var(--border);background:var(--surface-muted)}
.tbl td{padding:12px;border-bottom:1px solid var(--border);vertical-align:middle}
.tbl tr:hover td{background:var(--surface-muted)}
.tbl tr:last-child td{border-bottom:none}

/* ---------- Tabs / filter bar ---------- */
.tabs{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:18px;border-bottom:1px solid var(--border)}
.tab{padding:9px 2px;margin-bottom:-1px;color:var(--text-secondary);font-weight:600;font-size:13.5px;border-bottom:2px solid transparent}
.tab.active{color:var(--text-primary);border-bottom-color:var(--accent)}
.filterbar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}

/* ---------- Chat ---------- */
.chat{display:grid;grid-template-columns:308px 1fr;height:calc(100vh - var(--topbar-h));border-top:1px solid var(--border)}
.chat__list{border-right:1px solid var(--border);overflow-y:auto;background:var(--surface)}
.chat__conv{display:flex;gap:11px;padding:13px 16px;border-bottom:1px solid var(--border);cursor:pointer}
.chat__conv:hover,.chat__conv.active{background:var(--surface-muted)}
.chat__win{display:flex;flex-direction:column;min-width:0;background:var(--background)}
.chat__msgs{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:12px}
.bubble{max-width:64%;padding:10px 14px;border-radius:14px;font-size:13.5px;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow-soft)}
.bubble.me{align-self:flex-end;background:var(--accent);color:#fff;border-color:var(--accent)}
.chat__compose{border-top:1px solid var(--border);padding:14px 18px;display:flex;gap:10px;background:var(--surface)}
.chat__compose input{flex:1;background:var(--surface-muted);border:1px solid var(--border);border-radius:12px;padding:11px 14px;color:var(--text-primary);outline:none}

/* ---------- Inputs / forms ---------- */
.field{margin-bottom:14px}
.field label{display:block;font-size:12.5px;font-weight:600;color:var(--text-secondary);margin-bottom:6px}
.field input,.field textarea,.field select{
  width:100%;background:var(--surface);border:1px solid var(--border-strong);border-radius:var(--radius-md);
  padding:11px 13px;color:var(--text-primary);font-size:13.5px;font-family:inherit;outline:none;
}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--accent)}
.field input::placeholder,.field textarea::placeholder{color:var(--text-muted)}

/* ---------- Empty / loading ---------- */
.empty{text-align:center;padding:48px 20px;color:var(--text-secondary)}
.empty__ic{font-size:38px;margin-bottom:12px;opacity:.6}
.skeleton{background:linear-gradient(90deg,var(--surface-muted),#ECEBE7,var(--surface-muted));background-size:200% 100%;animation:sk 1.2s infinite;border-radius:8px}
@keyframes sk{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ---------- Modal ---------- */
.overlay{position:fixed;inset:0;background:rgba(23,23,23,.38);backdrop-filter:blur(2px);z-index:90;display:grid;place-items:center;padding:20px}
.modal{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);max-width:560px;width:100%;max-height:88vh;overflow-y:auto;box-shadow:var(--shadow-pop)}
.modal__head{display:flex;align-items:center;gap:10px;padding:18px 20px;border-bottom:1px solid var(--border)}
.modal__head h3{font-size:16px;font-weight:700}
.modal__head .icon-btn{margin-left:auto;width:32px;height:32px;font-size:15px}
.modal__body{padding:20px}
.modal__foot{padding:16px 20px;border-top:1px solid var(--border);display:flex;gap:10px;justify-content:flex-end}

/* ---------- Toast ---------- */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--text-primary);border:1px solid var(--text-primary);color:#fff;padding:12px 18px;border-radius:12px;z-index:120;box-shadow:var(--shadow-pop);font-size:13.5px;font-weight:500}
.toast.err{background:var(--danger);border-color:var(--danger)}

/* ---------- Misc ---------- */
.muted{color:var(--text-secondary)} .small{font-size:12px} .b{font-weight:700} .mt{margin-top:14px} .mb{margin-bottom:14px}
.divider{height:1px;background:var(--border);margin:16px 0}
.between{display:flex;align-items:center;justify-content:space-between;gap:12px}
.wrap-tags{display:flex;gap:7px;flex-wrap:wrap}
.copybox{background:var(--surface-muted);border:1px solid var(--border);border-radius:10px;padding:10px 13px;font-family:ui-monospace,Menlo,monospace;font-size:12.5px;color:var(--accent-hover);display:flex;align-items:center;gap:10px}
.copybox code{flex:1;overflow-x:auto}

/* ---------- Post media ---------- */
.media-thumb{position:relative;aspect-ratio:1;border-radius:12px;overflow:hidden;border:1px solid var(--border);background:var(--surface-muted)}
.media-thumb img,.media-thumb video{width:100%;height:100%;object-fit:cover;display:block}
.media-file{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;color:var(--text-secondary);font-size:11px;text-align:center;padding:8px}
.media-x{position:absolute;top:5px;right:5px;width:24px;height:24px;border-radius:50%;background:rgba(23,23,23,.6);color:#fff;border:none;display:grid;place-items:center;cursor:pointer}
.media-badge{position:absolute;top:6px;left:6px;background:rgba(23,23,23,.6);color:#fff;border-radius:6px;padding:2px;display:inline-flex}
.media-prog{position:absolute;inset:auto 0 0 0;background:var(--accent);color:#fff;font-size:11px;font-weight:600;text-align:center;padding:2px}
.media-retry{position:absolute;inset:auto 0 0 0;background:var(--danger);color:#fff;border:none;font-size:11px;padding:3px;cursor:pointer}
.post-gallery{display:grid;gap:6px;margin-top:12px;border-radius:12px;overflow:hidden}
.post-gallery.n1{grid-template-columns:1fr}
.post-gallery.n2{grid-template-columns:1fr 1fr}
.post-gallery.n3,.post-gallery.n4{grid-template-columns:1fr 1fr}
.post-gallery img,.post-gallery video{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:8px;border:1px solid var(--border)}
.post-gallery.n1 img,.post-gallery.n1 video{aspect-ratio:16/9}
.file-card{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid var(--border);border-radius:10px;margin-top:8px;background:var(--surface-muted)}

/* ---------- Mobile header/bottomnav/sheet ---------- */
.mobile-only{display:none!important}
.desktop-only{display:flex}
.bottomnav{display:none}
.bn-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;padding:8px 0 calc(8px + env(safe-area-inset-bottom));color:var(--text-secondary);min-height:44px}
.bn-item.active{color:var(--accent)}
.bn-ic{position:relative;display:inline-flex}
.bn-lbl{font-size:11px;font-weight:600;letter-spacing:-.01em}
.bn-dot{position:absolute;top:-2px;right:-4px;width:8px;height:8px;border-radius:50%;background:var(--accent);border:1.5px solid var(--surface)}
.sheet{position:fixed;inset:0;z-index:120;background:rgba(23,23,23,.4);opacity:0;transition:opacity .2s;display:flex;align-items:flex-end}
.sheet.open{opacity:1}
.sheet__box{width:100%;max-height:88vh;background:var(--surface);border-radius:22px 22px 0 0;transform:translateY(100%);transition:transform .24s cubic-bezier(.32,.72,0,1);display:flex;flex-direction:column;overflow:hidden;padding-bottom:env(safe-area-inset-bottom)}
.sheet.open .sheet__box{transform:none}
.sheet__grab{width:38px;height:4px;border-radius:4px;background:var(--border-strong);margin:10px auto 4px}
.sheet__head{display:flex;align-items:center;gap:12px;padding:12px 18px 14px;border-bottom:1px solid var(--border)}
.sheet__body{overflow-y:auto;padding:10px 12px 18px}
.sheet__group{margin-bottom:6px}

/* ---------- Responsive ---------- */
.scrim{display:none}
@media(max-width:1024px){.dash-grid{grid-template-columns:1fr}.g-4{grid-template-columns:repeat(2,1fr)}.g-3{grid-template-columns:repeat(2,1fr)}}
/* Tablet: thu gọn sidebar */
@media(max-width:1023px) and (min-width:768px){
  :root{--sidebar-w:208px}
  .sidebar__title small{display:none}
}
/* Mobile: ẩn sidebar, dùng header + bottom nav */
@media(max-width:767px){
  .shell{grid-template-columns:1fr}
  .sidebar{display:none}
  .mobile-only{display:flex!important}
  .desktop-only,.topbar__hide{display:none!important}
  .topbar{padding:0 14px;gap:8px}
  .topbar__spacer{flex:1}
  .bottomnav{display:flex;position:sticky;bottom:0;z-index:50;background:var(--surface);border-top:1px solid var(--border);box-shadow:0 -1px 8px rgba(0,0,0,.04)}
  #os-page{padding-bottom:4px}
  .content{padding:16px 14px 24px}
  .g-4,.g-3,.g-2{grid-template-columns:1fr}
  .hero{padding:20px 18px}.hero h1{font-size:22px}
  .page-head h1{font-size:21px}
  .chat{grid-template-columns:1fr;height:calc(100vh - var(--topbar-h) - 70px)}
  .chat__list{display:none}
  .tabs{overflow-x:auto;flex-wrap:nowrap;white-space:nowrap}
  .modal{max-width:100%;border-radius:18px 18px 0 0;align-self:flex-end;max-height:92vh}
  .overlay{align-items:flex-end;padding:0}
}
@media(min-width:768px){.bottomnav{display:none!important}}