/* ============================================================
   KAUTO.VN — Design System v1.1
   Nguyên tắc màu: #0277f4 là màu LOGO — chỉ dùng làm accent
   (active, link, 1 CTA chính). Bề mặt trung tính trắng/xám.
   Nguồn chân lý: design-system/MASTER.md
   ============================================================ */

/* ---------- 1. DESIGN TOKENS ---------- */
:root{
  /* Brand accent (dùng tiết chế) */
  --primary:#0277f4;
  --primary-600:#0264cf;
  --primary-100:#e8f2fe;
  --primary-50:#f3f8ff;

  /* Semantic */
  --success:#059669;
  --success-bg:rgba(16,185,129,.10);
  --danger:#e11d48;
  --danger-bg:rgba(225,29,72,.08);
  --warning:#d97706;

  /* Neutral (nền tảng chính của UI) */
  --ink:#111b29;
  --ink-soft:#51607a;
  --ink-mute:#8b98ad;
  --bg:#f4f6f9;
  --surface:#ffffff;
  --surface-tint:#f2f5f9;
  --border:#e4e9f0;
  --border-soft:#ecf0f5;

  /* Gradient: điểm nhấn có chọn lọc (CTA, icon chip, media) — không dùng cho nền trang/card body */
  --grad-primary:linear-gradient(135deg,#0277f4 0%,#38bdf8 100%);
  --grad-teal:linear-gradient(135deg,#0d9488 0%,#2dd4bf 100%);
  --grad-deep:linear-gradient(135deg,#0253ab 0%,#0277f4 55%,#38bdf8 100%);
  --grad-gold:linear-gradient(135deg,#f59e0b,#fbbf24);

  /* Shadows */
  --shadow-sm:0 1px 3px rgba(16,24,40,.05);
  --shadow-md:0 6px 20px rgba(16,24,40,.07);
  --shadow-lg:0 18px 46px rgba(16,24,40,.14);
  --shadow-primary:0 6px 16px rgba(2,119,244,.28);

  /* Radius */
  --radius-sm:10px;
  --radius:14px;
  --radius-lg:20px;
  --radius-full:999px;

  /* Spacing (hệ 4px) */
  --sp-1:4px; --sp-2:8px; --sp-3:12px; --sp-4:16px; --sp-5:20px; --sp-6:24px; --sp-8:32px;

  /* Typography */
  --font:'Be Vietnam Pro',system-ui,-apple-system,sans-serif;
  --fs-xs:12px; --fs-sm:13.5px; --fs-base:14.5px; --fs-md:16px; --fs-lg:18px; --fs-xl:22px; --fs-2xl:27px;

  /* Motion */
  --ease:cubic-bezier(.22,1,.36,1);
  --dur-fast:.18s;
  --dur:.25s;

  /* Layout */
  --sidebar-w:266px;
  --header-h:64px;
}

/* ---------- 2. BASE ---------- */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  color:var(--ink);
  font-size:15px;
  line-height:1.55;
  min-height:100dvh;
  background:
    radial-gradient(900px 380px at 85% -10%, rgba(2,119,244,.07), transparent 60%),
    radial-gradient(700px 320px at 5% -8%, rgba(56,189,248,.06), transparent 55%),
    linear-gradient(180deg,#f3f7fc 0%,#f1f4f9 40%,var(--bg) 100%);
}
body.no-scroll{overflow:hidden}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
svg{flex-shrink:0;display:block}
img{max-width:100%}
::selection{background:rgba(2,119,244,.18)}
:where(a,button,input,[tabindex]):focus-visible{outline:3px solid rgba(2,119,244,.45);outline-offset:2px;border-radius:8px}

/* ---------- 3. HEADER ---------- */
.header{
  position:sticky;top:0;z-index:100;
  height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:0 20px;
  background:rgba(255,255,255,.85);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border-soft);
}
.header-left{display:flex;align-items:center;gap:10px}
.menu-btn{
  display:none;
  width:42px;height:42px;border-radius:12px;place-items:center;
  background:var(--surface);border:1px solid var(--border);
  color:var(--ink-soft);
}
.brand{display:flex;align-items:center}
.brand-img{height:34px;width:auto;display:block}

/* Icon nav giữa header (desktop) — active theo URL, gạch chân gradient */
.header-nav{
  flex:1;min-width:0;align-self:stretch;
  display:flex;align-items:stretch;justify-content:center;gap:6px;
}
.header-nav a{
  position:relative;width:74px;
  display:grid;place-items:center;
  color:var(--ink-mute);
  transition:color var(--dur-fast) var(--ease);
}
.header-nav a::before{
  content:"";position:absolute;inset:10px 6px;border-radius:12px;
  background:transparent;transition:background var(--dur-fast) var(--ease);
}
.header-nav a:hover{color:var(--ink-soft)}
.header-nav a:hover::before{background:var(--surface-tint)}
.header-nav a svg{position:relative;z-index:1}
.header-nav a.active{color:var(--primary)}
.header-nav a.active::after{
  content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);
  width:46px;height:3px;border-radius:99px 99px 0 0;background:var(--grad-primary);
}
.header-nav .tip{
  position:absolute;top:calc(100% - 4px);left:50%;transform:translateX(-50%);
  background:#1c2733;color:#fff;font-size:10.5px;font-weight:700;white-space:nowrap;
  padding:4px 10px;border-radius:var(--radius-full);
  opacity:0;pointer-events:none;z-index:2;
  transition:opacity var(--dur-fast) var(--ease);
}
.header-nav a:hover .tip,.header-nav a:focus-visible .tip{opacity:1}

.header-right{display:flex;align-items:center;gap:10px}
.icon-btn{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;position:relative;
  background:var(--surface);border:1px solid var(--border);
  color:var(--ink-soft);
  transition:background var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease);
}
.icon-btn:hover{background:var(--surface-tint);color:var(--ink)}
.icon-btn .dot{position:absolute;top:9px;right:9px;width:8px;height:8px;border-radius:50%;background:var(--danger);border:2px solid #fff}
.wallet{
  display:flex;align-items:center;gap:10px;
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-full);padding:5px 5px 5px 15px;
}
.wallet-amount{font-weight:700;font-size:14px;white-space:nowrap;font-variant-numeric:tabular-nums}
.wallet-amount svg{display:inline-block;vertical-align:-3px;margin-right:6px;color:var(--ink-mute)}
.wallet-add{
  width:31px;height:31px;border-radius:50%;
  background:var(--grad-primary);color:#fff;display:grid;place-items:center;
  box-shadow:0 3px 8px rgba(2,119,244,.3);
  transition:filter var(--dur-fast) var(--ease),transform var(--dur) var(--ease);
}
.wallet-add:hover{filter:brightness(1.06);transform:rotate(90deg)}

/* Avatar + dropdown */
.user-menu{position:relative}
.avatar{
  width:40px;height:40px;border-radius:50%;
  background:var(--surface-tint);
  display:grid;place-items:center;color:var(--ink-soft);font-weight:700;font-size:14px;
  border:1.5px solid var(--border);cursor:pointer;
  transition:border-color var(--dur-fast) var(--ease);
}
.avatar:hover,[aria-expanded="true"].avatar{border-color:var(--primary)}
.user-panel{
  position:absolute;right:0;top:calc(100% + 10px);
  width:284px;z-index:120;
  background:var(--surface);
  border:1px solid var(--border);border-radius:var(--radius-lg);
  box-shadow:var(--shadow-lg);
  padding:8px;
  transform-origin:top right;
  animation:panelIn .18s var(--ease);
}
@keyframes panelIn{from{opacity:0;transform:scale(.96) translateY(-4px)}to{opacity:1;transform:none}}
.user-head{
  display:flex;align-items:center;gap:12px;
  padding:12px;margin-bottom:6px;
  background:var(--surface-tint);border-radius:var(--radius);
}
.user-head .avatar{width:44px;height:44px;cursor:default}
.user-head-info{min-width:0;flex:1}
.user-name{font-weight:700;font-size:14.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.user-balance{font-size:13px;font-weight:700;color:var(--primary);font-variant-numeric:tabular-nums}
.tier{
  font-size:11px;font-weight:700;
  color:#92600a;background:#fdf1dc;border:1px solid #f5dfb8;
  padding:3px 10px;border-radius:var(--radius-full);
}
.user-item{
  width:100%;display:flex;align-items:center;gap:11px;text-align:left;
  padding:10px 12px;border-radius:var(--radius-sm);
  font-size:14px;font-weight:600;color:var(--ink-soft);
  transition:background var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease);
}
.user-item:hover{background:var(--surface-tint);color:var(--ink)}
.user-item svg{color:var(--ink-mute)}
.user-item.danger{color:var(--danger)}
.user-item.danger svg{color:var(--danger)}
.user-item.danger:hover{background:var(--danger-bg);color:var(--danger)}
.user-sep{height:1px;background:var(--border-soft);margin:6px 4px}
.switch{
  margin-left:auto;width:40px;height:22px;border-radius:var(--radius-full);
  background:#d6dde8;position:relative;flex-shrink:0;
  transition:background var(--dur) var(--ease);
}
.switch::after{
  content:"";position:absolute;top:2px;left:2px;width:18px;height:18px;border-radius:50%;
  background:#fff;box-shadow:0 1px 3px rgba(16,24,40,.25);
  transition:transform var(--dur) var(--ease);
}
.switch.on{background:var(--primary)}
.switch.on::after{transform:translateX(18px)}

/* ---------- 4. LAYOUT ---------- */
.layout{
  display:grid;grid-template-columns:var(--sidebar-w) minmax(0,1fr);
  gap:20px;padding:20px;max-width:1660px;margin:0 auto;
  align-items:start;
}
.main{display:grid;grid-template-columns:minmax(0,1fr) 348px;gap:20px;min-width:0}
.col-left{display:flex;flex-direction:column;gap:16px;min-width:0}
.col-right{display:flex;flex-direction:column;gap:16px;position:sticky;top:calc(var(--header-h) + 20px)}

/* ---------- 5. SIDEBAR (3 cấp) ---------- */
.sidebar{
  position:sticky;top:calc(var(--header-h) + 20px);
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-sm);
  display:flex;flex-direction:column;
  max-height:calc(100dvh - var(--header-h) - 40px);
}
.sidebar-head{display:none}
.sidebar-scroll{overflow-y:auto;padding:12px 10px 16px;scrollbar-width:thin;scrollbar-color:#d3dbe6 transparent}
.sidebar-scroll::-webkit-scrollbar{width:5px}
.sidebar-scroll::-webkit-scrollbar-thumb{background:#d3dbe6;border-radius:99px}

.nav-section{
  font-size:11px;font-weight:800;letter-spacing:1.1px;text-transform:uppercase;
  color:var(--ink-mute);padding:16px 12px 7px;
}
.nav-section:first-child{padding-top:6px}

.nav-item{
  width:100%;display:flex;align-items:center;gap:11px;text-align:left;
  padding:10px 12px;border-radius:var(--radius-sm);
  font-weight:600;font-size:15px;color:var(--ink-soft);
  transition:background var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease);
  cursor:pointer;position:relative;
}
.nav-item:hover{background:var(--surface-tint);color:var(--ink)}
.nav-item.active{
  background:linear-gradient(90deg,var(--primary-100),rgba(56,189,248,.10));
  color:var(--primary);font-weight:700;
}
/* Thanh chỉ báo trái cho mục active cấp 1 */
.sidebar-scroll > .nav-item.active::after,
.sidebar-scroll > .nav-group > .nav-item.active::after{
  content:"";position:absolute;left:-10px;top:50%;transform:translateY(-50%);
  width:3.5px;height:60%;border-radius:99px;background:var(--grad-primary);
}
.nav-ico{width:24px;display:grid;place-items:center;color:var(--ink-mute);transition:color var(--dur-fast) var(--ease)}
.nav-item:hover .nav-ico{color:var(--ink-soft)}
.nav-item.active .nav-ico{color:var(--primary)}
.nav-ico.fb{color:#1877f2}.nav-ico.tt{color:#111}.nav-ico.ig{color:#e1306c}
.nav-ico.yt{color:#ff0000}.nav-ico.tg{color:#229ed9}.nav-ico.sp{color:#ee4d2d}

.nav-chev{margin-left:auto;color:var(--ink-mute);transition:transform var(--dur) var(--ease)}
.nav-group.open > .nav-item .nav-chev{transform:rotate(90deg)}
.nav-group.open > .nav-item{color:var(--ink)}

.badge{
  margin-left:auto;font-size:9px;font-weight:800;letter-spacing:.4px;
  padding:3px 8px;border-radius:var(--radius-full);color:#fff;text-transform:uppercase;
}
.nav-item .badge + .nav-chev{margin-left:6px}
.badge.hot{background:#f43f5e}
.badge.new{background:#0ea5e9}
.count{
  margin-left:auto;font-size:11px;font-weight:700;color:var(--ink-soft);
  background:var(--surface-tint);border:1px solid var(--border-soft);
  padding:2px 8px;border-radius:var(--radius-full);
}

/* Accordion: animate bằng grid-rows */
.nav-sub{display:grid;grid-template-rows:0fr;transition:grid-template-rows var(--dur) var(--ease)}
.nav-group.open > .nav-sub{grid-template-rows:1fr}
.nav-sub > .nav-sub-inner{overflow:hidden;min-height:0}

/* Cấp 2 */
.nav-sub .nav-sub-inner{margin-left:22px;padding-left:13px;border-left:1.5px solid var(--border)}
.nav-sub .nav-item{padding:8px 10px;font-size:14px}
.nav-sub .nav-item::before{
  content:"";position:absolute;left:-14.5px;top:50%;width:9px;height:1.5px;background:var(--border);
}
/* Cấp 3 */
.nav-sub .nav-sub .nav-sub-inner{margin-left:8px;padding-left:13px}
.nav-sub .nav-sub .nav-item{font-size:13.5px;color:var(--ink-mute);font-weight:500}
.nav-sub .nav-sub .nav-item:hover{color:var(--ink)}
.nav-sub .nav-sub .nav-item.active{color:var(--primary);font-weight:700;background:var(--primary-50)}
.nav-dot{width:5px;height:5px;border-radius:50%;background:currentColor;opacity:.5;margin:0 6px}
.nav-item.active .nav-dot{opacity:1}

/* Overlay drawer mobile */
.sidebar-overlay{
  position:fixed;inset:0;z-index:190;
  background:rgba(15,23,42,.4);
  backdrop-filter:blur(3px);-webkit-backdrop-filter:blur(3px);
  opacity:0;pointer-events:none;
  transition:opacity var(--dur) var(--ease);
}
.sidebar-overlay.show{opacity:1;pointer-events:auto}

/* ---------- 6. BOTTOM NAV (liquid glass, mobile) ---------- */
.bottom-nav{
  position:fixed;left:50%;transform:translateX(-50%);
  bottom:calc(12px + env(safe-area-inset-bottom,0px));
  z-index:150;
  width:min(560px,calc(100% - 32px));
  display:none;align-items:center;gap:4px;
  padding:7px;border-radius:24px;
  background:rgba(255,255,255,.62);
  backdrop-filter:blur(28px) saturate(1.8);-webkit-backdrop-filter:blur(28px) saturate(1.8);
  border:1px solid rgba(255,255,255,.75);
  box-shadow:0 10px 36px rgba(16,24,40,.18), inset 0 1px 0 rgba(255,255,255,.9);
}
.bottom-nav a{
  flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:7px 6px;border-radius:18px;
  font-size:10.5px;font-weight:600;color:var(--ink-soft);white-space:nowrap;
  transition:color var(--dur-fast) var(--ease),background var(--dur-fast) var(--ease);
}
.bottom-nav a svg{transition:transform var(--dur) var(--ease)}
.bottom-nav a:active svg{transform:scale(.9)}
.bottom-nav a.active{color:var(--primary);background:rgba(2,119,244,.10)}

/* ---------- 7. COMPONENTS ---------- */
.card{
  background:var(--surface);
  border:1px solid var(--border);border-radius:var(--radius-lg);
  box-shadow:var(--shadow-sm);overflow:hidden;
}
.card-head{
  display:flex;align-items:center;gap:10px;
  padding:14px 20px;
  background:linear-gradient(90deg,rgba(2,119,244,.06),rgba(56,189,248,.03) 60%,transparent);
  border-bottom:1px solid var(--border-soft);
  font-weight:800;font-size:15px;color:var(--ink);
}
.card-head svg{color:var(--primary)}
.card-head .sub{font-size:12px;font-weight:500;color:var(--ink-mute);margin-top:1px}

.btn{
  display:inline-flex;justify-content:center;align-items:center;gap:9px;
  padding:12px 22px;border-radius:12px;
  font-weight:700;font-size:var(--fs-base);letter-spacing:.2px;
  transition:background var(--dur-fast) var(--ease),transform var(--dur-fast) var(--ease),box-shadow var(--dur-fast) var(--ease);
}
.btn-primary{background:var(--grad-primary);color:#fff;box-shadow:var(--shadow-primary)}
.btn-primary:hover{filter:brightness(1.05);transform:translateY(-1px);box-shadow:0 10px 22px rgba(2,119,244,.35)}
.btn-block{width:100%}
.btn-ghost{background:var(--surface);color:var(--ink-soft);border:1px solid var(--border)}
.btn-ghost:hover{background:var(--surface-tint);color:var(--ink)}

/* ---------- FORM COMPONENTS (dùng chung mọi page có form) ---------- */
/* Field wrapper: nhãn trên, control dưới, helper/error phía dưới */
.field{display:flex;flex-direction:column;gap:8px;min-width:0}
.field-label{
  display:flex;align-items:center;gap:6px;
  font-size:13.5px;font-weight:700;color:var(--ink);letter-spacing:-.1px;
}
.field-label .req{color:var(--danger);font-weight:800}
.field-label .field-hint-ico{color:var(--ink-mute);display:inline-flex}
.field-help{font-size:12.5px;color:var(--ink-mute);line-height:1.5}
.field-error{font-size:12.5px;font-weight:600;color:var(--danger);min-height:0;display:none}
.field.has-error .field-error{display:block}
.field.has-error .input,.field.has-error .select-wrap,.field.has-error .textarea{
  border-color:rgba(225,29,72,.5);background:var(--danger-bg)
}

/* Text input + textarea */
.input,.textarea{
  width:100%;font-family:inherit;font-size:var(--fs-base);color:var(--ink);
  background:var(--surface-tint);border:1.5px solid var(--border);
  border-radius:var(--radius-sm);padding:12px 14px;
  transition:border-color var(--dur-fast) var(--ease),background var(--dur-fast) var(--ease),box-shadow var(--dur-fast) var(--ease);
}
.input::placeholder,.textarea::placeholder{color:var(--ink-mute);font-weight:500}
.input:hover,.textarea:hover{border-color:#cfd8e6}
.input:focus,.textarea:focus{
  outline:none;background:#fff;border-color:var(--primary);
  box-shadow:0 0 0 4px rgba(2,119,244,.12);
}
.textarea{resize:vertical;min-height:88px;line-height:1.55}
.input[readonly],.input:disabled,.textarea:disabled{opacity:.6;cursor:not-allowed}
.input.num{font-variant-numeric:tabular-nums;font-weight:600}

/* Input với addon (nút Dán / prefix / suffix) */
.input-group{
  display:flex;align-items:stretch;gap:0;background:var(--surface-tint);
  border:1.5px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;
  transition:border-color var(--dur-fast) var(--ease),background var(--dur-fast) var(--ease),box-shadow var(--dur-fast) var(--ease);
}
.input-group:hover{border-color:#cfd8e6}
.input-group:focus-within{background:#fff;border-color:var(--primary);box-shadow:0 0 0 4px rgba(2,119,244,.12)}
.input-group .input{
  flex:1;min-width:0;border:none;background:transparent;box-shadow:none;border-radius:0;
}
.input-group .input:focus{box-shadow:none;background:transparent}
.input-addon{
  flex-shrink:0;display:inline-flex;align-items:center;gap:6px;padding:0 14px;
  font-weight:700;font-size:13px;color:var(--ink-soft);
}
.input-addon.btn-addon{
  margin:5px;border-radius:9px;background:var(--ink);color:#fff;cursor:pointer;
  border:none;font-family:inherit;transition:filter var(--dur-fast) var(--ease);
}
.input-addon.btn-addon:hover{filter:brightness(1.12)}
.input-suffix{color:var(--ink-mute);padding-right:14px;font-weight:700}

/* Native select tuỳ biến (mũi tên riêng) */
.select-wrap{
  position:relative;display:flex;align-items:center;
  background:var(--surface-tint);border:1.5px solid var(--border);border-radius:var(--radius-sm);
  transition:border-color var(--dur-fast) var(--ease),background var(--dur-fast) var(--ease),box-shadow var(--dur-fast) var(--ease);
}
.select-wrap:hover{border-color:#cfd8e6}
.select-wrap:focus-within{background:#fff;border-color:var(--primary);box-shadow:0 0 0 4px rgba(2,119,244,.12)}
.select-wrap .lead-ico{position:absolute;left:14px;display:grid;place-items:center;color:var(--primary);pointer-events:none}
.select-wrap select{
  appearance:none;-webkit-appearance:none;width:100%;
  font-family:inherit;font-size:var(--fs-base);font-weight:600;color:var(--ink);
  background:transparent;border:none;outline:none;cursor:pointer;
  padding:12px 40px 12px 14px;
}
.select-wrap.has-lead select{padding-left:42px}
.select-wrap .chev{position:absolute;right:14px;color:var(--ink-mute);pointer-events:none;transition:transform var(--dur-fast) var(--ease)}
.select-wrap:focus-within .chev{color:var(--primary)}

/* Segmented control (radio dạng pill: máy chủ, chế độ...) */
.segmented{display:inline-flex;gap:6px;flex-wrap:wrap}
.segmented .seg{
  position:relative;display:inline-flex;align-items:center;gap:7px;
  padding:9px 16px;min-height:40px;border-radius:var(--radius-sm);
  border:1.5px solid var(--border);background:var(--surface);
  font-weight:700;font-size:13.5px;color:var(--ink-soft);cursor:pointer;
  transition:border-color var(--dur-fast) var(--ease),background var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease);
}
.segmented .seg input{position:absolute;opacity:0;inset:0;cursor:pointer;margin:0}
.segmented .seg:hover{border-color:var(--primary);color:var(--ink)}
.segmented .seg:has(input:checked){
  background:var(--ink);border-color:var(--ink);color:#fff;
}
.segmented .seg:has(input:focus-visible){box-shadow:0 0 0 4px rgba(2,119,244,.22)}
.segmented .seg .seg-tag{
  font-size:8.5px;font-weight:800;letter-spacing:.4px;text-transform:uppercase;
  background:var(--grad-primary);color:#fff;padding:2px 6px;border-radius:var(--radius-full);
}
.segmented .seg:has(input:checked) .seg-tag{background:#fff;color:var(--ink)}

/* Choice cards (radio/checkbox dạng thẻ lưới: chọn kênh, gói...) */
.choice-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.choice{
  position:relative;display:flex;flex-direction:column;gap:7px;
  padding:13px 14px;border-radius:var(--radius);cursor:pointer;
  border:1.5px solid var(--border);background:var(--surface);
  transition:border-color var(--dur-fast) var(--ease),background var(--dur-fast) var(--ease),box-shadow var(--dur-fast) var(--ease);
}
.choice input{position:absolute;opacity:0;inset:0;cursor:pointer;margin:0}
.choice:hover{border-color:var(--primary)}
.choice:has(input:checked){
  border-color:var(--primary);background:var(--primary-50);
  box-shadow:0 0 0 3px rgba(2,119,244,.10);
}
.choice:has(input:focus-visible){box-shadow:0 0 0 4px rgba(2,119,244,.22)}
.choice-top{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}
.choice-title{font-weight:700;font-size:13.5px;color:var(--ink);line-height:1.35}
.choice:has(input:checked) .choice-title{color:var(--primary)}
.choice-price{
  flex-shrink:0;font-weight:800;font-size:13px;color:var(--danger);
  font-variant-numeric:tabular-nums;white-space:nowrap;
}
.choice-meta{
  align-self:flex-start;font-size:11px;font-weight:700;color:var(--primary);
  background:var(--primary-50);border:1px solid rgba(2,119,244,.14);
  padding:2px 9px;border-radius:var(--radius-full);
}
.choice-check{
  position:absolute;top:-7px;right:-7px;width:18px;height:18px;border-radius:50%;
  background:var(--grad-primary);color:#fff;display:grid;place-items:center;
  opacity:0;transform:scale(.5);box-shadow:0 2px 6px rgba(2,119,244,.35);
  transition:opacity var(--dur-fast) var(--ease),transform var(--dur-fast) var(--ease);
}
.choice:has(input:checked) .choice-check{opacity:1;transform:scale(1)}

/* Reaction picker (checkbox cảm xúc Facebook) — icon nổi, tick góc khi chọn */
.reactions{display:flex;flex-wrap:wrap;gap:8px}
.reaction{
  position:relative;display:grid;place-items:center;
  width:48px;height:48px;border-radius:14px;cursor:pointer;
  border:1.5px solid transparent;background:var(--surface-tint);
  transition:border-color var(--dur-fast) var(--ease),background var(--dur-fast) var(--ease),transform var(--dur-fast) var(--ease);
}
.reaction input{position:absolute;opacity:0;inset:0;cursor:pointer;margin:0}
.reaction img{width:32px;height:32px;pointer-events:none;transition:transform var(--dur-fast) var(--ease),filter var(--dur-fast) var(--ease);filter:grayscale(.6) opacity(.7)}
.reaction:hover{background:#fff}
.reaction:hover img{transform:scale(1.12);filter:none}
.reaction:has(input:checked){
  background:#fff;border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(2,119,244,.16),0 6px 14px rgba(2,119,244,.22);
}
.reaction:has(input:checked) img{filter:saturate(1.12) brightness(1.04);transform:scale(1.14)}
.reaction:has(input:focus-visible){box-shadow:0 0 0 4px rgba(2,119,244,.28)}
.reaction .rx-badge{
  position:absolute;top:-5px;right:-5px;width:17px;height:17px;border-radius:50%;
  background:var(--grad-primary);color:#fff;display:grid;place-items:center;
  border:2px solid var(--surface);
  opacity:0;transform:scale(.4);box-shadow:0 2px 6px rgba(2,119,244,.4);
  transition:opacity var(--dur-fast) var(--ease),transform var(--dur-fast) var(--ease);
}
.reaction:has(input:checked) .rx-badge{opacity:1;transform:scale(1)}

/* Checkbox / radio đơn lẻ (inline) */
.check{display:inline-flex;align-items:center;gap:9px;cursor:pointer;font-size:13.5px;font-weight:600;color:var(--ink-soft)}
.check input{
  appearance:none;-webkit-appearance:none;width:20px;height:20px;flex-shrink:0;
  border:1.5px solid var(--border);border-radius:6px;background:#fff;cursor:pointer;
  display:grid;place-items:center;transition:background var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease);
}
.check input[type=radio]{border-radius:50%}
.check input:checked{background:var(--grad-primary);border-color:var(--primary)}
.check input:checked::after{content:"";width:11px;height:6px;border-left:2px solid #fff;border-bottom:2px solid #fff;transform:rotate(-45deg) translateY(-1px)}
.check input[type=radio]:checked::after{width:8px;height:8px;border:none;border-radius:50%;background:#fff;transform:none}
.check:hover input{border-color:var(--primary)}

/* Stat cards */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.stat-card{
  background:var(--surface);
  border-radius:var(--radius-lg);padding:20px 22px;
  border:1px solid var(--border);box-shadow:var(--shadow-sm);
  display:flex;align-items:center;gap:16px;
}
.stat-ico{width:50px;height:50px;border-radius:15px;display:grid;place-items:center;color:#fff}
.stat-card.blue{background:linear-gradient(135deg,#ffffff 45%,#f0f7ff 100%)}
.stat-card.cyan{background:linear-gradient(135deg,#ffffff 45%,#eefbf7 100%)}
.stat-card.blue .stat-ico{background:var(--grad-primary);box-shadow:0 6px 14px rgba(2,119,244,.28)}
.stat-card.cyan .stat-ico{background:var(--grad-teal);box-shadow:0 6px 14px rgba(13,148,136,.28)}
.stat-value{font-size:var(--fs-2xl);font-weight:800;letter-spacing:-.5px;font-variant-numeric:tabular-nums}
.stat-value small{font-size:13px;font-weight:600;color:var(--ink-mute);margin-left:4px}
.stat-label{font-size:13px;font-weight:600;color:var(--ink-soft);margin-top:1px}
.trend{
  margin-left:auto;display:flex;align-items:center;gap:5px;align-self:flex-start;
  font-size:12px;font-weight:700;color:var(--success);
  background:var(--success-bg);
  padding:5px 10px;border-radius:var(--radius-full);
}

/* ---------- Facebook-style feed ---------- */
.fb-post{padding:16px 18px;border-bottom:1px solid var(--border-soft)}
.fb-post:last-child{border-bottom:none}
.fb-post-top{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.fb-ava{
  width:42px;height:42px;border-radius:50%;flex-shrink:0;
  display:grid;place-items:center;color:#fff;font-weight:800;font-size:14px;
  box-shadow:0 2px 6px rgba(16,24,40,.14);
}
.fb-post-meta{min-width:0;flex:1}
.fb-post-name{font-weight:700;font-size:14.5px;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fb-post-sub{display:flex;align-items:center;gap:5px;font-size:12px;color:var(--ink-mute)}
.fb-post-sub .dot-sep{opacity:.7}
.fb-post-sub svg{color:var(--ink-mute)}
.fb-more{
  width:34px;height:34px;border-radius:50%;flex-shrink:0;
  display:grid;place-items:center;color:var(--ink-mute);
  transition:background var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease);
}
.fb-more:hover{background:var(--surface-tint);color:var(--ink-soft)}
.fb-post-body{font-size:14.5px;color:var(--ink);line-height:1.5;margin-bottom:12px}
.fb-post-body b{font-weight:700}
.fb-post-body .money{color:var(--success);font-weight:700}

/* Reaction summary + counts */
.fb-post-stats{display:flex;align-items:center;gap:6px;padding-bottom:8px;font-size:12.5px;color:var(--ink-mute)}
.fb-react-pile{display:inline-flex;flex-direction:row-reverse}
.fb-react-chip{
  width:19px;height:19px;border-radius:50%;margin-left:-5px;
  display:grid;place-items:center;font-size:11px;line-height:1;
  background:#fff;border:1.5px solid #fff;box-shadow:0 0 0 .5px rgba(16,24,40,.06);
}
.fb-react-pile .fb-react-chip:last-child{margin-left:0}
.fb-react-total{font-weight:600}
.fb-post-meta-right{margin-left:auto;white-space:nowrap}

/* Action row */
.fb-post-actions{
  display:flex;align-items:center;gap:4px;
  padding-top:4px;border-top:1px solid var(--border-soft);
}
.fb-action{
  flex:1;display:flex;align-items:center;justify-content:center;gap:7px;
  padding:9px 6px;border-radius:10px;
  font-size:13.5px;font-weight:700;color:var(--ink-soft);
  transition:background var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease);
}
.fb-action:hover{background:var(--surface-tint)}
.fb-action svg{color:var(--ink-mute);transition:color var(--dur-fast) var(--ease)}
.fb-action:hover svg{color:var(--ink-soft)}
.fb-like-btn.is-reacted{color:var(--primary)}
.fb-like-btn.is-reacted svg{color:var(--primary)}
.fb-like-ico{display:grid;place-items:center;font-size:16px;line-height:1}
.fb-like-btn.is-reacted .fb-like-ico svg path{fill:currentColor}

/* Reaction picker (thả cảm xúc khi hover) */
.fb-action-wrap{position:relative;flex:1;display:flex}
.fb-action-wrap .fb-action{flex:1}
.fb-reactions{
  position:absolute;bottom:100%;left:0;z-index:30;
  padding-bottom:10px;                /* cầu nối trong suốt để giữ hover */
  opacity:0;visibility:hidden;pointer-events:none;
  transform:translateY(8px);
  transition:opacity var(--dur-fast) var(--ease),transform var(--dur-fast) var(--ease),visibility var(--dur-fast);
}
.fb-action-wrap:hover .fb-reactions,
.fb-reactions:hover,
.fb-reactions:focus-within{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0)}
.fb-reactions-pill{
  display:flex;align-items:center;gap:2px;padding:6px;
  background:#fff;border:1px solid var(--border-soft);
  border-radius:var(--radius-full);
  box-shadow:0 10px 28px rgba(16,24,40,.18);
}
.fb-emoji{
  position:relative;width:38px;height:38px;border-radius:50%;
  display:grid;place-items:center;font-size:26px;line-height:1;
  transition:transform .18s var(--ease);transform-origin:bottom center;
}
.fb-emoji:hover{transform:translateY(-10px) scale(1.35)}
.fb-emoji::after{
  content:attr(data-label);
  position:absolute;bottom:calc(100% + 6px);left:50%;transform:translateX(-50%) scale(.9);
  background:#1c2733;color:#fff;font-size:10.5px;font-weight:700;white-space:nowrap;
  padding:3px 8px;border-radius:var(--radius-full);
  opacity:0;pointer-events:none;transition:opacity .15s var(--ease);
}
.fb-emoji:hover::after{opacity:1}
/* Xuất hiện lần lượt như Facebook */
.fb-action-wrap:hover .fb-emoji{animation:emojiPop .3s var(--ease) backwards}
.fb-emoji:nth-child(1){animation-delay:.02s}
.fb-emoji:nth-child(2){animation-delay:.05s}
.fb-emoji:nth-child(3){animation-delay:.08s}
.fb-emoji:nth-child(4){animation-delay:.11s}
.fb-emoji:nth-child(5){animation-delay:.14s}
.fb-emoji:nth-child(6){animation-delay:.17s}
@keyframes emojiPop{from{opacity:0;transform:translateY(10px) scale(.4)}to{opacity:1;transform:none}}

/* Footer reaction bên trong bài ghim */
.post .fb-post-stats{margin-top:15px}
.post .btn + .fb-post-stats{margin-top:16px}
/* Mỗi thông báo là 1 card riêng: đồng bộ viền dưới với viền card */
.post.card{border-bottom:1px solid var(--border)}

/* Posts */
.post{padding:20px 22px;border-bottom:1px solid var(--border-soft)}
.post:last-child{border-bottom:none}
.post-top{display:flex;align-items:flex-start;gap:12px;margin-bottom:13px}
.post-ava{
  width:44px;height:44px;border-radius:50%;flex-shrink:0;
  background:var(--surface-tint);border:1px solid var(--border);
  display:grid;place-items:center;color:var(--ink-soft);font-weight:800;font-size:15px;
}
.post-name{display:flex;align-items:center;gap:7px;font-weight:700;font-size:14.5px;flex-wrap:wrap}
.tag-admin{
  font-size:9.5px;font-weight:800;letter-spacing:.4px;text-transform:uppercase;
  background:var(--grad-primary);color:#fff;padding:2.5px 8px;border-radius:var(--radius-full);
}
.verified{color:var(--primary)}
.post-time{font-size:12px;color:var(--ink-mute);margin-top:1px}
.pin-btn{
  margin-left:auto;display:flex;align-items:center;gap:6px;
  font-size:12px;font-weight:700;color:var(--ink-soft);
  background:var(--surface);border:1px solid var(--border);
  padding:5px 12px;border-radius:var(--radius-full);
}
.post-title{font-size:15.5px;font-weight:800;margin-bottom:7px;letter-spacing:-.2px}
.post-body{color:var(--ink-soft);font-size:14px}
.post-body p{margin-bottom:9px}
.post-body p:last-child{margin-bottom:0}
.post-body a{color:var(--primary);font-weight:600}
.post-body a:hover{text-decoration:underline}
.post-body ul{list-style:none;margin:9px 0}
.post-body li{display:flex;align-items:flex-start;gap:9px;margin-bottom:6px}
.post-body li svg{color:var(--success);margin-top:3px}
.post .btn{margin-top:14px}

/* Update carousel */
.update-body{padding:16px 20px}
.update-slide{display:none}
.update-slide.on{display:block;animation:fadeIn .35s var(--ease)}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.update-slide h4{font-size:14px;font-weight:700;line-height:1.5;margin-bottom:7px}
.update-slide .date{font-size:12px;color:var(--ink-mute)}
.update-nav{display:flex;align-items:center;justify-content:space-between;padding:0 20px 14px}
.dots{display:flex;gap:6px}
.dots span{width:7px;height:7px;border-radius:var(--radius-full);background:#d6dde8;transition:all var(--dur) var(--ease);cursor:pointer}
.dots span.on{width:20px;background:var(--primary)}
.update-arrows{display:flex;gap:8px}
.arrow-btn{
  width:29px;height:29px;border-radius:50%;display:grid;place-items:center;
  background:var(--surface);border:1px solid var(--border);color:var(--ink-soft);
  transition:background var(--dur-fast) var(--ease);
}
.arrow-btn:hover{background:var(--surface-tint)}

/* Video */
.video-card{position:relative;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-md);border:1px solid var(--border)}
.video-thumb{
  aspect-ratio:16/9;
  background:
    radial-gradient(360px 180px at 82% 18%, rgba(34,211,238,.35), transparent 60%),
    var(--grad-deep);
  display:flex;flex-direction:column;justify-content:space-between;padding:16px;
}
.video-tag{align-self:flex-start;font-size:10px;font-weight:800;letter-spacing:.5px;color:#fff;background:rgba(255,255,255,.16);backdrop-filter:blur(6px);padding:4px 10px;border-radius:var(--radius-full);text-transform:uppercase}
.video-title{color:#fff;font-weight:700;font-size:14.5px;line-height:1.4}
.video-play{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  width:54px;height:54px;border-radius:50%;
  background:rgba(255,255,255,.95);display:grid;place-items:center;color:var(--ink);
  box-shadow:0 12px 30px rgba(16,24,40,.35);
  transition:transform var(--dur) var(--ease);
}
.video-play:hover{transform:translate(-50%,-50%) scale(1.08)}

/* FAB */
.fab{
  position:fixed;right:22px;bottom:22px;z-index:90;
  width:52px;height:52px;border-radius:50%;
  background:var(--grad-primary);color:#fff;display:grid;place-items:center;
  box-shadow:0 10px 26px rgba(2,119,244,.38);
  transition:filter var(--dur-fast) var(--ease),transform var(--dur) var(--ease);
}
.fab:hover{filter:brightness(1.06);transform:translateY(-3px)}

/* ---------- 7b. CHAT (popup kiểu Messenger + trang Hỗ trợ) ---------- */
.chat-head{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:12px 14px;border-bottom:1px solid var(--border-soft);
  background:var(--surface);cursor:pointer;flex-shrink:0;
}
.chat-page-card .chat-head{cursor:default;padding:16px 20px}
.chat-head-who{display:flex;align-items:center;gap:10px;min-width:0}
.chat-head-avatar{
  position:relative;width:36px;height:36px;border-radius:50%;flex-shrink:0;
  background:var(--grad-primary);color:#fff;font-weight:800;font-size:12.5px;
  display:grid;place-items:center;
}
.chat-page-card .chat-head-avatar{width:44px;height:44px;font-size:14px}
.chat-online-dot{
  position:absolute;bottom:-1px;right:-1px;width:10px;height:10px;border-radius:50%;
  background:var(--success);border:2px solid var(--surface);
}
.chat-head-info{min-width:0}
.chat-head-name{font-size:13.5px;font-weight:700;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat-page-card .chat-head-name{font-size:15px}
.chat-head-status{display:flex;align-items:center;gap:5px;font-size:11px;color:var(--ink-mute)}
.chat-head-status .live-dot{width:6px;height:6px;border-radius:50%;background:var(--success);animation:chatPulse 1.6s ease-in-out infinite}
@keyframes chatPulse{0%,100%{opacity:1}50%{opacity:.35}}
.chat-head-actions{display:flex;align-items:center;gap:2px;flex-shrink:0}
.chat-head-btn{
  width:30px;height:30px;border-radius:50%;display:grid;place-items:center;color:var(--ink-mute);
  transition:background var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease);
}
.chat-head-btn:hover{background:var(--surface-tint);color:var(--ink)}

.chat-widget{display:flex;flex-direction:column;flex:1;min-height:0}
.chat-thread{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:9px;scrollbar-width:thin;scrollbar-color:#d3dbe6 transparent}
.chat-thread::-webkit-scrollbar{width:5px}
.chat-thread::-webkit-scrollbar-thumb{background:#d3dbe6;border-radius:99px}
.chat-day{align-self:center;font-size:11px;font-weight:700;color:var(--ink-mute);background:var(--surface-tint);padding:4px 12px;border-radius:var(--radius-full);margin-bottom:2px}
.chat-msg{display:flex;max-width:80%}
.chat-msg.in{align-self:flex-start}
.chat-msg.out{align-self:flex-end}
.chat-bubble{padding:9px 14px;border-radius:16px;font-size:13.5px;line-height:1.5;word-break:break-word;white-space:pre-wrap}
.chat-msg.in .chat-bubble{background:var(--surface-tint);color:var(--ink);border-bottom-left-radius:4px}
.chat-msg.out .chat-bubble{background:var(--grad-primary);color:#fff;border-bottom-right-radius:4px}
.chat-msg.out .chat-bubble b{color:#fff}
.chat-img-msg{padding:0}
.chat-img-msg img{max-width:200px;max-height:220px;border-radius:14px;display:block;object-fit:cover}

.chat-typing .chat-bubble{display:flex;gap:4px;align-items:center;padding:12px 15px}
.chat-typing .dot{width:6px;height:6px;border-radius:50%;background:var(--ink-mute);animation:chatTyping 1s infinite ease-in-out}
.chat-typing .dot:nth-child(2){animation-delay:.15s}
.chat-typing .dot:nth-child(3){animation-delay:.3s}
@keyframes chatTyping{0%,60%,100%{opacity:.35;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}

.chat-composer{border-top:1px solid var(--border-soft);padding:10px 12px;flex-shrink:0;background:var(--surface)}
.chat-attach-preview{display:flex;gap:8px;padding-bottom:8px;flex-wrap:wrap}
.chat-attach-preview[hidden]{display:none}
.chat-preview-chip{position:relative;width:54px;height:54px;border-radius:10px;overflow:hidden;border:1px solid var(--border);flex-shrink:0}
.chat-preview-chip img{width:100%;height:100%;object-fit:cover;display:block}
.chat-preview-remove{
  position:absolute;top:2px;right:2px;width:17px;height:17px;border-radius:50%;
  background:rgba(17,27,41,.65);color:#fff;display:grid;place-items:center;
}
.chat-composer-row{display:flex;align-items:center;gap:6px}
.chat-attach-btn,.chat-send-btn{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;flex-shrink:0;transition:background var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease),filter var(--dur-fast) var(--ease)}
.chat-attach-btn{background:transparent;color:var(--ink-mute)}
.chat-attach-btn:hover{background:var(--surface-tint);color:var(--primary)}
.chat-send-btn{background:var(--grad-primary);color:#fff;box-shadow:var(--shadow-primary)}
.chat-send-btn:hover{filter:brightness(1.05)}
.chat-send-btn[disabled]{opacity:.4;pointer-events:none;box-shadow:none;filter:none}
.chat-input{
  flex:1;min-width:0;border:none;outline:none;background:var(--surface-tint);
  border-radius:var(--radius-full);padding:10px 16px;font-family:inherit;font-size:13.5px;color:var(--ink);
  transition:background var(--dur-fast) var(--ease),box-shadow var(--dur-fast) var(--ease);
}
.chat-input:focus{background:#fff;box-shadow:0 0 0 3px rgba(2,119,244,.12)}
.chat-input::placeholder{color:var(--ink-mute)}

/* Popup nổi kiểu Messenger (góc phải dưới) */
.chat-popup{
  position:fixed;right:22px;bottom:22px;z-index:180;
  width:328px;height:min(460px,calc(100dvh - 100px));
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-lg) var(--radius-lg) 0 0;
  box-shadow:var(--shadow-lg);
  display:flex;flex-direction:column;overflow:hidden;
  transform:translateY(16px) scale(.97);opacity:0;
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease),height var(--dur) var(--ease);
}
.chat-popup[hidden]{display:none}
.chat-popup.open{transform:none;opacity:1}
.chat-popup.collapsed{height:auto}
.chat-popup.collapsed .chat-widget{display:none}

@media (max-width:480px){
  .chat-popup{right:10px;left:10px;width:auto;bottom:10px;height:min(72dvh,520px)}
}

/* Trang Hỗ trợ (full page) */
.main.page-support{display:flex;flex-direction:column;height:calc(100dvh - var(--header-h) - 40px);min-height:560px}
.main.page-support .support-head{flex-shrink:0}
.chat-page-wrap{
  display:grid;grid-template-columns:272px minmax(0,1fr);gap:20px;
  flex:1;min-height:0;
}
.chat-side{display:flex;flex-direction:column;min-height:0}
.chat-side .card-head{flex-shrink:0}
.chat-side-scroll{flex:1;min-height:0;overflow-y:auto;padding:10px;display:flex;flex-direction:column;gap:4px;scrollbar-width:thin;scrollbar-color:#d3dbe6 transparent}
.chat-convo{
  display:flex;align-items:center;gap:10px;padding:10px;border-radius:var(--radius-sm);
  text-align:left;width:100%;transition:background var(--dur-fast) var(--ease);
}
.chat-convo:hover{background:var(--surface-tint)}
.chat-convo.active{background:linear-gradient(90deg,var(--primary-100),rgba(56,189,248,.10))}
.chat-convo-info{min-width:0;flex:1}
.chat-convo-name{font-size:13.5px;font-weight:700;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat-convo-last{font-size:12px;color:var(--ink-mute);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat-convo-time{font-size:11px;color:var(--ink-mute);flex-shrink:0;align-self:flex-start;margin-top:2px}
.chat-faq-title{font-size:11px;font-weight:800;letter-spacing:.6px;text-transform:uppercase;color:var(--ink-mute);padding:14px 14px 8px}
.chat-faq-list{display:flex;flex-direction:column;gap:6px;padding:0 10px 12px}
.chat-faq-chip{
  text-align:left;padding:9px 12px;border-radius:var(--radius-sm);
  font-size:13px;font-weight:600;color:var(--ink-soft);
  background:var(--surface-tint);border:1px solid transparent;
  transition:border-color var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease);
}
.chat-faq-chip:hover{border-color:rgba(2,119,244,.3);color:var(--primary)}
.chat-page-card{display:flex;flex-direction:column;min-height:0}

@media (max-width:900px){
  .chat-side{display:none}
}
@media (max-width:640px){
  .chat-page-wrap{grid-template-columns:1fr}
}

/* ---------- 8. MOTION SAFETY ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}

/* ---------- 9. RESPONSIVE ---------- */
@media (max-width:1420px){
  .main{grid-template-columns:minmax(0,1fr) 318px}
}
@media (max-width:1240px){
  .main{grid-template-columns:1fr}
  .col-right{position:static;flex-direction:row;flex-wrap:wrap}
  .col-right>*{flex:1 1 300px}
}
@media (max-width:1024px){
  .layout{grid-template-columns:1fr;padding:14px;padding-bottom:96px}
  .menu-btn{display:grid}
  .header-nav{display:none}
  .main.page-support{height:calc(100dvh - var(--header-h) - 136px);min-height:420px}

  /* Header mobile: toggle | logo giữa | avatar */
  .brand{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%)}
  .brand-img{height:30px}
  .wallet,.header .icon-btn{display:none}

  /* Bottom nav liquid glass */
  .bottom-nav{display:flex}
  .fab{bottom:calc(88px + env(safe-area-inset-bottom,0px))}

  /* Sidebar → drawer */
  .sidebar{
    position:fixed;top:0;left:0;z-index:200;
    width:min(300px,86vw);height:100dvh;max-height:none;
    border-radius:0;border:none;border-right:1px solid var(--border);
    transform:translateX(-105%);
    transition:transform .3s var(--ease);
    box-shadow:var(--shadow-lg);
  }
  .sidebar.open{transform:translateX(0)}
  .sidebar-head{
    display:flex;align-items:center;justify-content:space-between;
    padding:12px 14px;border-bottom:1px solid var(--border-soft);
  }
  .sidebar-head .brand{position:static;transform:none}
  .sidebar-head .brand-img{height:26px}
  .sidebar-close{
    width:36px;height:36px;border-radius:10px;display:grid;place-items:center;
    background:var(--surface-tint);color:var(--ink-soft);
  }
}
@media (max-width:640px){
  .stats{grid-template-columns:1fr}
  .header{padding:0 12px}
  .user-panel{width:min(300px,calc(100vw - 24px))}
}