/* =========================================================================
   VPN Admin · THỬ NGHIỆM giao diện kiểu Google (Material 3, light, mobile-first)
   - GIỮ NGUYÊN mọi tên class & biến app.js đang dùng (--line/--mut/--ok/.dot/.badge…)
   - Đặc trưng Google: bo tròn lớn, bóng mềm theo tầng, accent indigo/blue,
     ripple state-layer khi hover/active, nav pill, FAB-style button, typography Roboto.
   ========================================================================= */
:root{
  /* surface tones (M3) */
  --bg:#f6f8fc;
  --bg2:#ffffff;
  --bg3:#eef2f9;          /* state layer / hover fill */
  --line:#dde3ec;         /* outline-variant (app.js đọc cho lưới chart) */
  --txt:#1b1f27;          /* on-surface */
  --mut:#5f6571;          /* on-surface-variant (app.js đọc cho nhãn chart) */

  /* primary (Google blue/indigo) */
  --acc:#1a73e8;          /* Google blue 600 */
  --acc2:#1765cc;         /* hover */
  --acc-soft:rgba(26,115,232,.10);
  --ok:#1e8e3e; --warn:#e37400; --err:#d93025; --vip:#8430ce;

  /* shape */
  --r:16px; --r-sm:10px; --r-pill:999px; --sp:8px;
  --topbar-h:56px; --side-w:248px;

  /* elevation (M3 mềm, nhiều tầng) */
  --sh-1:0 1px 2px rgba(60,64,67,.08), 0 1px 3px rgba(60,64,67,.06);
  --sh-2:0 1px 3px rgba(60,64,67,.10), 0 4px 12px rgba(60,64,67,.10);
  --sh-3:0 8px 28px rgba(60,64,67,.18), 0 2px 8px rgba(60,64,67,.10);
  --ring:0 0 0 3px rgba(26,115,232,.24);
  --fast:.18s; --med:.26s;
  --ease:cubic-bezier(.2,.0,0,1);   /* Material standard easing */
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  background:var(--bg);
  color:var(--txt);
  font:14px/1.55 "Roboto",ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,"Apple Color Emoji",sans-serif;
  font-feature-settings:"tnum";
  -webkit-font-smoothing:antialiased;
}
a{color:var(--acc);text-decoration:none}
a:hover{color:var(--acc2)}
b{font-weight:600}
.hidden{display:none!important}
::selection{background:rgba(26,115,232,.16)}
::-webkit-scrollbar{width:12px;height:12px}
::-webkit-scrollbar-thumb{background:#c4ccd8;border-radius:99px;border:3px solid transparent;background-clip:content-box}
::-webkit-scrollbar-thumb:hover{background:#aeb7c5;background-clip:content-box}

/* ============================ FORM CONTROLS ============================ */
/* M3 “outlined field”: bo tròn, viền mảnh, focus 2px xanh */
input:not([type=checkbox]):not([type=radio]),select,textarea{
  width:100%;background:var(--bg2);border:1px solid var(--line);border-radius:var(--r-sm);
  color:var(--txt);padding:11px 13px;font-size:14px;font-family:inherit;outline:none;
  transition:border-color var(--fast),box-shadow var(--fast),background var(--fast);
}
input:hover,select:hover,textarea:hover{border-color:#c2cad6}
input:focus,select:focus,textarea:focus{border-color:var(--acc);box-shadow:var(--ring)}
::placeholder{color:#9aa2af}
select{appearance:none;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'><path d='M2 4l4 4 4-4' fill='none' stroke='%235f6571' stroke-width='1.6' stroke-linecap='round'/></svg>");
  background-repeat:no-repeat;background-position:right 11px center;padding-right:32px;cursor:pointer}

/* Button = M3 filled, bo pill, ripple state-layer + bóng nổi nhẹ khi hover */
button{
  position:relative;overflow:hidden;
  background:var(--acc);color:#fff;border:0;border-radius:var(--r-pill);
  padding:10px 22px;font-size:14px;font-weight:600;letter-spacing:.01em;font-family:inherit;cursor:pointer;width:100%;
  box-shadow:var(--sh-1);
  transition:background var(--fast),box-shadow var(--med),transform var(--fast);
}
button::after{ /* state layer */
  content:"";position:absolute;inset:0;background:#fff;opacity:0;transition:opacity var(--fast)
}
button:hover{background:var(--acc2);box-shadow:var(--sh-2)}
button:hover::after{opacity:.10}
button:active{transform:translateY(1px);box-shadow:var(--sh-1)}
button:active::after{opacity:.18}
button:focus-visible{box-shadow:var(--ring)}
button:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}

/* ============================== LOGIN ================================= */
.login-body{
  display:flex;min-height:100vh;min-height:100dvh;align-items:center;justify-content:center;padding:18px;
  background:
    radial-gradient(1100px 640px at 12% -5%, rgba(26,115,232,.18), transparent 55%),
    radial-gradient(900px 600px at 100% 105%, rgba(132,48,206,.14), transparent 55%),
    #0e1530;
}
.login-card{
  background:var(--bg2);border:1px solid var(--line);border-radius:28px;
  padding:32px 28px;width:100%;max-width:380px;box-shadow:var(--sh-3);
  animation:rise .5s var(--ease) both;
}
.login-card h1{
  font-size:22px;font-weight:600;margin:0 0 22px;text-align:center;letter-spacing:-.01em;
  display:flex;align-items:center;justify-content:center;gap:10px;
}
.login-card h1::before{
  content:"";width:12px;height:12px;border-radius:50%;
  background:conic-gradient(from 200deg,var(--acc),var(--vip),#34a853,var(--acc));
}
.field{margin-bottom:15px}
.field label{display:block;font-size:12px;font-weight:600;color:var(--mut);margin-bottom:6px}
.msg{margin-top:12px;color:var(--err);font-size:13px;min-height:18px;text-align:center;font-weight:500}

/* ============================== LAYOUT ================================ */
.topbar{
  position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:12px;
  height:var(--topbar-h);padding:0 16px;padding-top:env(safe-area-inset-top);
  background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
}
.brand{font-weight:600;font-size:17px;letter-spacing:-.01em;display:flex;align-items:center;gap:10px}
.brand::before{
  content:"";width:11px;height:11px;border-radius:50%;
  background:conic-gradient(from 200deg,var(--acc),var(--vip),#34a853,var(--acc));
}
.spacer{flex:1}
.who{font-size:12.5px;color:var(--mut);display:flex;align-items:center;gap:8px}
.role{font-style:normal;font-size:10px;font-weight:700;padding:3px 9px;border-radius:var(--r-pill);text-transform:uppercase;letter-spacing:.05em}
.role-admin{background:rgba(132,48,206,.14);color:var(--vip)}
.role-sales{background:var(--acc-soft);color:var(--acc)}
.logout{
  font-size:12.5px;font-weight:600;color:var(--mut);padding:7px 13px;border-radius:var(--r-pill);
  border:1px solid var(--line);transition:all var(--fast)
}
.logout:hover{color:var(--err);border-color:rgba(217,48,37,.4);background:rgba(217,48,37,.06)}
.hamburger{
  width:auto;background:transparent;color:var(--txt);font-size:22px;line-height:1;
  padding:7px 9px;border-radius:50%;display:none;box-shadow:none
}
.hamburger::after{border-radius:50%}
.hamburger:hover{background:var(--bg3)}

.sidebar{
  position:fixed;top:var(--topbar-h);left:0;width:var(--side-w);
  height:calc(100vh - var(--topbar-h));height:calc(100dvh - var(--topbar-h));
  background:var(--bg2);border-right:1px solid var(--line);padding:14px 12px;
  overflow-y:auto;z-index:20
}
/* M3 navigation item: pill bo tròn lớn, active nền xanh nhạt + chữ xanh đậm */
.sidebar .nav{
  display:flex;align-items:center;gap:12px;position:relative;
  padding:11px 16px;border-radius:var(--r-pill);color:var(--txt);
  font-size:14px;font-weight:500;margin-bottom:4px;
  transition:background var(--fast),color var(--fast)
}
.sidebar .nav:hover{background:var(--bg3)}
.sidebar .nav.active{
  background:var(--acc-soft);color:var(--acc);font-weight:600;box-shadow:none
}
.sidebar .nav.active::before{
  content:"";position:absolute;left:6px;top:50%;transform:translateY(-50%);
  width:4px;height:22px;border-radius:99px;background:var(--acc)
}

.content{
  margin-left:var(--side-w);padding:20px;min-height:calc(100vh - var(--topbar-h));
  animation:fade var(--med) ease both
}
.loading{color:var(--mut);padding:48px;text-align:center;animation:pulse 1.2s ease-in-out infinite}

/* ============================= KPI cards ============================== */
.kpi-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin-bottom:18px}
.kpi{
  background:var(--bg2);border:1px solid var(--line);border-radius:var(--r);
  padding:15px 17px;box-shadow:var(--sh-1);transition:box-shadow var(--med),transform var(--fast)
}
.kpi:hover{box-shadow:var(--sh-2);transform:translateY(-1px)}
.kpi .k-label{font-size:11px;color:var(--mut);text-transform:uppercase;letter-spacing:.05em;font-weight:600}
.kpi .k-val{font-size:26px;font-weight:600;margin-top:5px;line-height:1.1;letter-spacing:-.02em}
.kpi .k-sub{font-size:11.5px;color:var(--mut);margin-top:3px}
.kpi.ok .k-val{color:var(--ok)} .kpi.warn .k-val{color:var(--warn)}
.kpi.err .k-val{color:var(--err)} .kpi.acc .k-val{color:var(--acc)}

/* ============================== PANELS ================================ */
.panel{
  background:var(--bg2);border:1px solid var(--line);border-radius:var(--r);
  margin-bottom:18px;overflow:hidden;box-shadow:var(--sh-1);
  animation:rise var(--med) var(--ease) both
}
.panel-h{
  display:flex;align-items:center;gap:10px;padding:14px 16px;
  border-bottom:1px solid var(--line);font-weight:600;font-size:14px
}
.panel-h .spacer{flex:1}
.panel-b{padding:16px}
.cols{display:grid;grid-template-columns:1fr 1fr;gap:18px}

/* ============================== TABLES ================================ */
.tbl-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
table{width:100%;border-collapse:collapse;font-size:13px;white-space:nowrap}
th,td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);border-right:1px solid var(--line)}
th:last-child,td:last-child{border-right:0}
th{
  color:var(--mut);font-weight:600;font-size:11px;text-transform:uppercase;letter-spacing:.05em;
  background:var(--bg3);position:sticky;top:0;z-index:1
}
th[data-sort]{cursor:pointer;user-select:none}
th[data-sort]:hover{color:var(--acc)}
tbody tr{transition:background var(--fast)}
tbody tr:hover td{background:var(--bg3)}
tbody tr:last-child td{border-bottom:0}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}
.clickrow{cursor:pointer}

/* trạng thái dạng chấm tròn (online/up = xanh, off/down = xám) */
.dot{display:inline-block;width:9px;height:9px;border-radius:50%;vertical-align:middle}
.dot-on{background:var(--ok)}
.dot-off{background:var(--mut)}

/* ============================== BADGES ================================ */
/* M3 “tonal chip”: nền nhạt cùng tông, bo pill */
.badge{display:inline-block;padding:3px 10px;border-radius:var(--r-pill);font-size:11px;font-weight:600;line-height:1.5}
.b-ok{background:rgba(30,142,62,.14);color:var(--ok)}
.b-warn{background:rgba(227,116,0,.16);color:var(--warn)}
.b-err{background:rgba(217,48,37,.14);color:var(--err)}
.b-mut{background:var(--bg3);color:var(--mut)}
.b-vip{background:rgba(132,48,206,.14);color:var(--vip)}

/* ============================ CONTROLS ================================ */
.toolbar{display:flex;gap:9px;flex-wrap:wrap;margin-bottom:16px;align-items:center}
.toolbar input,.toolbar select{width:auto;min-width:180px}
/* nút nhỏ trên toolbar: kiểu “tonal/outlined”, vẫn pill */
.btn-sm{width:auto;padding:8px 16px;font-size:13px;border-radius:var(--r-pill)}
.btn-mut{background:var(--bg2);color:var(--acc);border:1px solid var(--line);box-shadow:none}
.btn-mut::after{background:var(--acc)}
.btn-mut:hover{background:var(--acc-soft);border-color:var(--acc)}
.btn-err{background:var(--err)} .btn-err:hover{background:#b3261e}
.btn-ok{background:var(--ok)} .btn-ok:hover{background:#16702f}
.act-row{display:flex;gap:6px;flex-wrap:wrap}

/* ============================== CHARTS ================================ */
.chart-box{position:relative;height:252px}

/* ============================== MODAL ================================= */
.modal-bg{
  position:fixed;inset:0;background:rgba(32,33,36,.5);backdrop-filter:blur(4px);
  display:flex;align-items:center;justify-content:center;z-index:50;padding:18px;
  animation:fade var(--fast) ease both
}
.modal{
  background:var(--bg2);border:1px solid var(--line);border-radius:28px;   /* M3 dialog bo lớn */
  width:100%;max-width:480px;max-height:90vh;overflow:auto;box-shadow:var(--sh-3);
  animation:rise var(--med) var(--ease) both
}
.modal-h{padding:18px 20px 6px;font-weight:600;font-size:18px;display:flex;align-items:center}
.modal-b{padding:12px 20px 18px}
.modal-f{padding:10px 18px 16px;display:flex;gap:8px;justify-content:flex-end}
.modal-f button{width:auto}
.x{cursor:pointer;color:var(--mut);margin-left:auto;font-size:20px;line-height:1;padding:4px 8px;border-radius:50%;transition:all var(--fast)}
.x:hover{background:var(--bg3);color:var(--err)}
.kv{display:grid;grid-template-columns:140px 1fr;gap:9px 12px;font-size:13px}
.kv .k{color:var(--mut);font-weight:600}
.qr-box{display:flex;justify-content:center;padding:18px;background:#fff;border:1px solid var(--line);border-radius:var(--r);width:fit-content;margin:0 auto 14px}
.secret{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--bg3);border:1px dashed var(--line);
  padding:11px;border-radius:var(--r-sm);text-align:center;letter-spacing:2px;word-break:break-all;font-size:13px}

/* ============================== TOAST ================================= */
/* M3 snackbar: nền tối, chữ sáng, bo tròn, nổi dưới */
.toast{
  position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom));transform:translateX(-50%);
  background:#2e3138;color:#eef1f6;border:0;border-left:4px solid var(--mut);
  padding:13px 20px;border-radius:12px;z-index:60;font-size:13.5px;font-weight:500;
  box-shadow:var(--sh-3);animation:toastIn var(--med) var(--ease) both
}
.toast.ok{border-left-color:#81c995}
.toast.err{border-left-color:#f28b82}

/* ============================ UTILITIES =============================== */
.muted{color:var(--mut)}
.right{text-align:right}
.nowrap{white-space:nowrap}
small.hint{color:var(--mut);font-size:11.5px}

/* ============================ ANIMATIONS ============================== */
@keyframes fade{from{opacity:0}to{opacity:1}}
@keyframes rise{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
@keyframes toastIn{from{opacity:0;transform:translate(-50%,14px)}to{opacity:1;transform:translate(-50%,0)}}
@keyframes pulse{0%,100%{opacity:.55}50%{opacity:1}}

/* ============================= RESPONSIVE ============================= */
@media(max-width:880px){.cols{grid-template-columns:1fr}}

@media(max-width:760px){
  .hamburger{display:block}
  .sidebar{
    transform:translateX(-100%);transition:transform var(--med) var(--ease);
    box-shadow:var(--sh-3);width:min(82vw,280px);border-right:0;border-radius:0 16px 16px 0
  }
  .sidebar.open{transform:translateX(0)}
  .sidebar .nav{padding:14px 16px;font-size:15px}     /* tap target ≥48px */
  .content{margin-left:0;padding:14px}
  .who b{display:none}
  .kpi .k-val{font-size:22px}
  .kv{grid-template-columns:112px 1fr}
  .toolbar input,.toolbar select{width:100%;min-width:0;flex:1 1 100%}
  .modal{border-radius:24px}
  th,td{padding:10px 12px}
}

@media(max-width:420px){
  .topbar{padding:0 12px;gap:9px}
  .brand{font-size:15px}
  .content{padding:11px}
  button{padding:11px 20px}     /* nút to hơn cho ngón tay */
}

/* tôn trọng người dùng tắt hiệu ứng */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
}

/* ===== Material Symbols (icon kiểu Google) ===== */
.mi{font-family:"Material Symbols Rounded";font-weight:400;font-style:normal;font-size:20px;line-height:1;
  letter-spacing:normal;text-transform:none;display:inline-block;white-space:nowrap;direction:ltr;
  font-feature-settings:"liga";-webkit-font-smoothing:antialiased;vertical-align:middle;
  font-variation-settings:"FILL" 0,"wght" 400,"GRAD" 0,"opsz" 20}
.sidebar .nav .mi{font-size:21px}
.sidebar .nav.active .mi{font-variation-settings:"FILL" 1,"wght" 500,"GRAD" 0,"opsz" 24}
.btn-sm .mi,button .mi{font-size:18px;margin-right:-2px}
.panel-h .mi{font-size:19px;color:var(--mut)}
.hamburger .mi{font-size:24px}