:root{
  --bg:#FAFAF9; --panel:#FFFFFF; --panel2:#F5F5F4;
  --border:#E7E5E4; --border-strong:#D6D3D1;
  --text:#1C1917; --muted:#57534E; --dim:#A8A29E;
  --orange:#F97316; --orange-hover:#EA580C;
  --orange-soft:#FFEDD5; --orange-bg:#FFF7ED; --orange-deep:#9A3412;
  --green:#16A34A; --green-soft:#DCFCE7; --green-deep:#166534;
  --red:#DC2626; --red-soft:#FEE2E2; --red-deep:#991B1B;
  --amber:#D97706; --amber-soft:#FEF3C7; --amber-deep:#92400E;
  --green-dark:var(--green-soft); --red-dark:var(--red-soft); --amber-dark:var(--amber-soft);
  --shadow-sm:0 1px 2px rgba(28,25,23,.04);
  --shadow-md:0 4px 6px -1px rgba(28,25,23,.07),0 2px 4px -2px rgba(28,25,23,.05);
  --shadow-lg:0 10px 15px -3px rgba(28,25,23,.08),0 4px 6px -4px rgba(28,25,23,.04);
  --grid-free-bg:#F0FDF4; --grid-free-border:#BBF7D0; --grid-free-text:#166534;
  --grid-busy-bg:#FEF2F2; --grid-busy-border:#FECACA; --grid-busy-text:#991B1B;
  --nav-bg:rgba(255,255,255,.85);
  --body-glow:rgba(249,115,22,.08);
}
[data-theme="dark"]{
  --bg:#0C0A09; --panel:#1C1917; --panel2:#292524;
  --border:#292524; --border-strong:#44403C;
  --text:#FAFAF9; --muted:#A8A29E; --dim:#57534E;
  --orange:#FB923C; --orange-hover:#F97316;
  --orange-soft:#431407; --orange-bg:#1C1917; --orange-deep:#FED7AA;
  --green:#22C55E; --green-soft:#052E16; --green-deep:#86EFAC;
  --red:#EF4444; --red-soft:#450A0A; --red-deep:#FCA5A5;
  --amber:#F59E0B; --amber-soft:#451A03; --amber-deep:#FCD34D;
  --green-dark:var(--green-soft); --red-dark:var(--red-soft); --amber-dark:var(--amber-soft);
  --shadow-sm:0 1px 2px rgba(0,0,0,.3);
  --shadow-md:0 4px 6px -1px rgba(0,0,0,.4),0 2px 4px -2px rgba(0,0,0,.3);
  --shadow-lg:0 10px 15px -3px rgba(0,0,0,.5),0 4px 6px -4px rgba(0,0,0,.3);
  --grid-free-bg:#052E16; --grid-free-border:#14532D; --grid-free-text:#86EFAC;
  --grid-busy-bg:#450A0A; --grid-busy-border:#7F1D1D; --grid-busy-text:#FCA5A5;
  --nav-bg:rgba(12,10,9,.85);
  --body-glow:rgba(251,146,60,.06);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; background:var(--bg);
  background-image:radial-gradient(ellipse 1000px 500px at 50% -30%,var(--body-glow),transparent 70%);
  background-attachment:fixed;
  color:var(--text); min-height:100vh;
  font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  font-size:14px; line-height:1.5; -webkit-tap-highlight-color:transparent;
  -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale;
  transition:background-color .2s ease, color .2s ease;
}
a{color:var(--orange);text-decoration:none;transition:color .15s}
a:hover{color:var(--orange-hover);text-decoration:underline}
button,input,select,textarea{font-family:inherit;font-size:inherit}
h1,h2,h3{margin:0;font-weight:600;letter-spacing:-.02em}

/* ---------- Icon baseline ---------- */
i.fas,i.far,i.fab{line-height:1;display:inline-block;vertical-align:middle}

/* ---------- Nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:24px;
  padding:14px 24px;background:var(--nav-bg);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);transition:background .2s ease;
}
.nav-brand{color:var(--text);font-weight:600;font-size:15px;letter-spacing:-.02em}
.nav-brand span{color:var(--orange)}
.nav-brand:hover{text-decoration:none}
.nav-links{display:flex;gap:2px;flex:1;overflow-x:auto;scrollbar-width:none}
.nav-links::-webkit-scrollbar{display:none}
.nav-link{
  display:inline-flex;align-items:center;gap:6px;
  color:var(--muted);padding:6px 12px;border-radius:6px;font-size:13px;
  white-space:nowrap;transition:all .15s;
}
.nav-link i{font-size:12px;opacity:.75}
.nav-link:hover{background:var(--panel2);color:var(--text);text-decoration:none}
.nav-link:hover i{opacity:1}
.nav-link.active{background:var(--orange-soft);color:var(--orange-deep);font-weight:500}
.nav-link.active i{opacity:1}
.nav-right{display:flex;align-items:center;gap:8px;flex-shrink:0}
.nav-email{color:var(--dim);font-size:12px;margin-right:4px}
.nav-icon-btn{
  background:transparent;border:none;color:var(--muted);cursor:pointer;
  padding:0;border-radius:6px;display:inline-flex;align-items:center;
  justify-content:center;transition:all .15s;width:32px;height:32px;font-size:15px;
}
.nav-icon-btn:hover{background:var(--panel2);color:var(--orange)}
.nav-logout{
  display:inline-flex;align-items:center;gap:6px;
  background:transparent;border:none;color:var(--muted);font-size:13px;
  cursor:pointer;padding:6px 10px;border-radius:6px;transition:all .15s;
}
.nav-logout i{font-size:12px}
.nav-logout:hover{color:var(--red);background:var(--red-soft)}

/* ---------- Layout ---------- */
.container{max-width:1200px;margin:0 auto;padding:32px 24px}
.page-header{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap}
.page-title{font-size:24px;letter-spacing:-.02em;color:var(--text)}
.page-subtitle{color:var(--muted);font-size:14px;margin-top:4px}

/* ---------- Cards ---------- */
.card{
  background:var(--panel);border:1px solid var(--border);border-radius:12px;
  padding:20px;box-shadow:var(--shadow-sm);transition:all .15s;
}
.card + .card{margin-top:16px}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:6px;padding:9px 16px;border-radius:8px;
  border:1px solid var(--border);background:var(--panel);color:var(--text);
  cursor:pointer;font-weight:500;font-size:13px;transition:all .15s;
  box-shadow:var(--shadow-sm);
}
.btn i{font-size:13px}
.btn:hover{background:var(--panel2);border-color:var(--border-strong)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn-primary{background:var(--orange);border-color:var(--orange);color:#fff;box-shadow:0 1px 2px rgba(249,115,22,.2)}
.btn-primary:hover{background:var(--orange-hover);border-color:var(--orange-hover);box-shadow:0 4px 12px rgba(249,115,22,.25)}
.btn-success{background:var(--green);border-color:var(--green);color:#fff}
.btn-success:hover{background:#15803d;border-color:#15803d}
.btn-danger{background:var(--red);border-color:var(--red);color:#fff}
.btn-danger:hover{background:#b91c1c;border-color:#b91c1c}
.btn-ghost{background:transparent;box-shadow:none}
.btn-ghost:hover{background:var(--panel2)}
.btn-sm{padding:5px 10px;font-size:12px;box-shadow:none}
.btn-sm i{font-size:11px}
.btn-block{width:100%;justify-content:center}

/* ---------- Inputs ---------- */
label.field{display:block;margin-bottom:12px}
label.field > span{
  display:block;font-size:11px;text-transform:uppercase;letter-spacing:.05em;
  color:var(--muted);margin-bottom:6px;font-weight:500;
}
.input, select.input, textarea.input{
  width:100%;padding:10px 12px;border-radius:8px;border:1px solid var(--border);
  background:var(--panel);color:var(--text);transition:all .15s;
}
.input:hover{border-color:var(--border-strong)}
.input:focus{outline:none;border-color:var(--orange);box-shadow:0 0 0 3px rgba(249,115,22,.15)}
input[type=checkbox]{accent-color:var(--orange);width:16px;height:16px;cursor:pointer}

/* ---------- Chips ---------- */
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 14px;border-radius:8px;border:1px solid var(--border);
  background:var(--panel);color:var(--text);font-size:13px;cursor:pointer;
  transition:all .15s;font-family:inherit;min-height:36px;font-weight:500;
}
.chip i{font-size:12px;opacity:.75}
.chip:hover{border-color:var(--border-strong);background:var(--panel2)}
.chip.on{background:var(--orange);border-color:var(--orange);color:#fff}
.chip.on i{opacity:1}

/* ---------- Table ---------- */
.table-wrap{overflow-x:auto;border-radius:12px;border:1px solid var(--border);margin-top:16px;background:var(--panel)}
table{width:100%;border-collapse:collapse;font-size:13px}
thead{background:var(--panel2)}
th{
  padding:12px 16px;text-align:left;font-weight:500;color:var(--muted);
  font-size:11px;text-transform:uppercase;letter-spacing:.05em;
}
td{padding:12px 16px;border-top:1px solid var(--border)}
tbody tr{transition:background .15s}
tbody tr:hover{background:var(--orange-bg)}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px}

/* ---------- Badges ---------- */
.badge{display:inline-block;padding:3px 8px;border-radius:99px;font-size:11px;font-weight:500}
.badge i{font-size:9px;margin-right:3px}
.badge-admin{background:var(--orange-soft);color:var(--orange-deep)}
.badge-faculty{background:var(--green-soft);color:var(--green-deep)}
.badge-student{background:var(--panel2);color:var(--muted)}
.badge-pending{background:var(--amber-soft);color:var(--amber-deep)}
.badge-approved{background:var(--green-soft);color:var(--green-deep)}
.badge-rejected{background:var(--red-soft);color:var(--red-deep)}
.badge-gray{background:var(--panel2);color:var(--muted)}

/* ---------- Vacancy grid ---------- */
.grid-toolbar{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.grid-toolbar .btn.active{background:var(--orange);border-color:var(--orange);color:#fff;box-shadow:0 1px 2px rgba(249,115,22,.2)}
.grid-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:12px;margin-top:16px;background:var(--panel)}
.vacancy-table{width:100%;border-collapse:collapse;font-size:13px}
.vacancy-table th{
  padding:10px 6px;background:var(--panel2);color:var(--muted);text-align:center;
  font-size:11px;font-weight:500;position:sticky;top:0;z-index:2;
}
.vacancy-table th.room-col{text-align:left;padding:10px 16px;position:sticky;left:0;z-index:3;background:var(--panel2)}
.vacancy-table td.room-cell{
  padding:10px 16px;background:var(--panel);position:sticky;left:0;z-index:1;
  border-right:1px solid var(--border);min-width:160px;
}
.vacancy-table td.room-cell .mono{color:var(--text);font-weight:500}
.vacancy-table td.room-cell .meta{font-size:11px;color:var(--dim);margin-top:2px}
.vacancy-table td.slot-cell{padding:3px 2px;text-align:center}
.vacancy-table td.slot-cell > div{
  height:38px;border-radius:6px;display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:500;
}
.cell-free{background:var(--grid-free-bg);border:1px solid var(--grid-free-border);color:var(--grid-free-text)}
.cell-busy{background:var(--grid-busy-bg);border:1px solid var(--grid-busy-border);color:var(--grid-busy-text)}
.floor-row td{
  background:var(--bg);color:var(--muted);padding:8px 16px;font-size:11px;
  text-transform:uppercase;letter-spacing:.05em;font-weight:500;
  position:sticky;left:0;border-top:1px solid var(--border);
}
.floor-row i{font-size:10px;margin-right:6px;opacity:.7}

/* ---------- Login ---------- */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}
.login-card{
  width:100%;max-width:420px;background:var(--panel);border:1px solid var(--border);
  border-radius:16px;padding:32px;box-shadow:var(--shadow-lg);
}
.login-card h1{font-size:22px;letter-spacing:-.02em}
.login-card .sub{color:var(--muted);font-size:13px;margin-top:4px}
.login-oauth{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  width:100%;padding:12px;margin-top:8px;border-radius:8px;
  border:1px solid var(--border-strong);background:var(--panel);color:var(--text);
  font-weight:500;cursor:pointer;font-size:14px;transition:all .15s;
}
.login-oauth i{font-size:16px}
.login-oauth:hover{background:var(--panel2)}
.login-divider{display:flex;align-items:center;gap:12px;margin:20px 0;color:var(--dim);font-size:11px}
.login-divider::before,.login-divider::after{content:'';flex:1;height:1px;background:var(--border)}
.login-hint{color:var(--dim);font-size:12px;text-align:center;margin-top:20px}
.login-success{
  background:var(--green-soft);border:1px solid var(--green);color:var(--green-deep);
  border-radius:8px;padding:14px;margin-top:12px;font-size:13px;
}
.login-error{
  background:var(--red-soft);border:1px solid var(--red);color:var(--red-deep);
  border-radius:8px;padding:10px 14px;margin-top:12px;font-size:12px;display:none;
}
.login-error i{font-size:11px;margin-right:4px}
.pwd-wrap{position:relative}
.pwd-wrap input{padding-right:42px}
.pwd-toggle{
  position:absolute;right:10px;top:50%;transform:translateY(-50%);
  background:none;border:none;color:var(--dim);cursor:pointer;
  padding:4px 6px;font-size:13px;transition:color .15s;
}
.pwd-toggle:hover{color:var(--text)}

/* ---------- Room cards ---------- */
.room-grid{display:grid;gap:8px;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));margin-top:12px}
.room-card{
  background:var(--panel);border:1px solid var(--border);border-radius:10px;
  padding:14px;text-align:left;cursor:pointer;transition:all .15s;
  color:inherit;font:inherit;box-shadow:var(--shadow-sm);
}
.room-card:hover:not(:disabled){border-color:var(--orange);background:var(--orange-bg);box-shadow:var(--shadow-md);transform:translateY(-1px)}
.room-card:disabled{opacity:.4;cursor:not-allowed}
.room-card .rc-name{font-family:ui-monospace,monospace;font-weight:500;color:var(--text);font-size:13px;display:flex;align-items:center;gap:6px}
.room-card .rc-name i{font-size:11px;color:var(--orange)}
.room-card .rc-meta{font-size:11px;color:var(--dim);margin-top:4px}
.room-card.busy{background:var(--red-soft);border-color:var(--red);opacity:.75;box-shadow:none}
.room-card.busy .rc-name{color:var(--red-deep)}
.room-card.busy .rc-name i{color:var(--red)}

/* ---------- Stats ---------- */
.stats{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));margin-top:20px}
.stat{
  background:var(--panel);border:1px solid var(--border);border-radius:12px;
  padding:20px;color:inherit;transition:all .15s;text-decoration:none;
  box-shadow:var(--shadow-sm);
}
.stat:hover{border-color:var(--border-strong);box-shadow:var(--shadow-md);text-decoration:none;transform:translateY(-1px)}
.stat-icon{font-size:20px;color:var(--orange);margin-bottom:12px;display:block}
.stat-value{font-size:32px;font-weight:600;color:var(--text);line-height:1}
.stat-label{color:var(--dim);font-size:11px;text-transform:uppercase;letter-spacing:.05em;margin-top:8px}

/* ---------- Quick action card ---------- */
.action-card{
  background:var(--panel);border:1px solid var(--border);border-radius:12px;
  padding:20px;text-decoration:none;color:inherit;transition:all .15s;
  box-shadow:var(--shadow-sm);display:flex;align-items:flex-start;gap:12px;
}
.action-card:hover{border-color:var(--border-strong);box-shadow:var(--shadow-md);text-decoration:none;transform:translateY(-1px)}
.action-card .ac-icon{
  width:36px;height:36px;border-radius:8px;background:var(--orange-soft);
  color:var(--orange);display:inline-flex;align-items:center;justify-content:center;
  font-size:16px;flex-shrink:0;
}
.action-card .ac-body{flex:1;min-width:0}
.action-card .ac-title{color:var(--text);font-weight:500;font-size:14px}
.action-card .ac-sub{color:var(--dim);font-size:12px;margin-top:2px}

/* ---------- Toast ---------- */
.toast{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(150%);
  background:var(--text);border-radius:10px;padding:12px 20px;font-size:13px;
  transition:transform .25s ease;z-index:100;box-shadow:var(--shadow-lg);max-width:90vw;
  color:var(--bg);
}
.toast.show{transform:translateX(-50%) translateY(0)}
.toast-success{background:var(--green-deep);color:#fff}
.toast-error{background:var(--red-deep);color:#fff}

/* ---------- Utility ---------- */
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.muted{color:var(--muted)}
.dim{color:var(--dim)}
.mt-2{margin-top:8px}
.mt-4{margin-top:16px}
.mt-6{margin-top:24px}
.empty{padding:48px 24px;text-align:center;color:var(--dim)}
.empty i{display:block;font-size:28px;margin-bottom:12px;color:var(--dim);opacity:.5}

/* ============================================================
   RESPONSIVE — tablet
   ============================================================ */
@media (max-width: 968px){
  .container{padding:24px 20px}
  .page-title{font-size:22px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .nav{padding:12px 20px;gap:16px}
  .nav-email{display:none}
  .room-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}
}

/* ============================================================
   RESPONSIVE — mobile
   ============================================================ */
@media (max-width: 640px){
  .container{padding:20px 16px}
  .page-title{font-size:20px}
  .page-subtitle{font-size:13px}
  .page-header{flex-direction:column;align-items:stretch}
  .stats{grid-template-columns:1fr}
  .stat-value{font-size:28px}
  .stat-icon{font-size:18px;margin-bottom:8px}
  .room-grid{grid-template-columns:1fr}

  .nav{padding:10px 14px;gap:8px;flex-wrap:wrap}
  .nav-brand{font-size:14px}
  .nav-links{order:3;width:100%;margin-top:6px;padding-bottom:2px}
  .nav-link{padding:6px 10px;font-size:12px}
  .nav-link i{font-size:11px}
  .nav-right{gap:6px}
  .nav-logout{padding:6px 8px;font-size:12px}
  .nav-logout span{display:none}
  .nav-logout i{font-size:14px}

  .input, select.input, textarea.input{font-size:16px}

  .btn{padding:11px 16px;font-size:13px;min-height:42px}
  .btn-sm{padding:8px 12px;min-height:36px}
  .chip{padding:10px 16px;font-size:14px;min-height:42px}
  .nav-icon-btn{width:38px;height:38px;font-size:16px}

  .row{gap:10px}
  .row > *{flex:1 1 100%}

  .page-header .row{width:100%}
  .page-header .btn{flex:1 1 auto}

  .login-card{padding:24px;border-radius:12px}
  .login-card h1{font-size:20px}

  .room-card{padding:14px 16px;min-height:60px}

  th{padding:10px 12px;font-size:10px}
  td{padding:10px 12px}
  .mono{font-size:12px}

  .toast{bottom:16px;padding:12px 16px;font-size:13px;max-width:calc(100vw - 32px)}
}

/* ============================================================
   RESPONSIVE — small phone
   ============================================================ */
@media (max-width: 400px){
  .container{padding:16px 12px}
  .page-title{font-size:18px}
  .card{padding:14px}
  .stat{padding:16px}
  .stat-value{font-size:24px}
  .login-card{padding:20px}
  .chip{padding:9px 12px;font-size:13px}
  .btn{padding:10px 14px;font-size:12px}
}

@media (prefers-reduced-motion: reduce){
  *{transition:none !important;animation:none !important}
}