/* =====================================================================
   NitanAI — dark SaaS dashboard theme
   Pure CSS, no framework, no external fonts.
   ===================================================================== */

:root{
  --bg:        #0b0d14;
  --bg-2:      #10131d;
  --panel:     #151926;
  --panel-2:   #1b2031;
  --line:      #262c40;
  --text:      #e7eaf3;
  --muted:     #8b93ab;
  --accent:    #7c5cff;
  --accent-2:  #22d3ee;
  --ok:        #34d399;
  --warn:      #fbbf24;
  --bad:       #f87171;
  --radius:    14px;
  --shadow:    0 10px 30px rgba(0,0,0,.45);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:
    radial-gradient(900px 500px at 12% -10%, rgba(124,92,255,.20), transparent 60%),
    radial-gradient(800px 450px at 100% 0%, rgba(34,211,238,.12), transparent 55%),
    var(--bg);
  color:var(--text);
  font-family:"Inter","Segoe UI",system-ui,-apple-system,"Noto Sans Khmer","Khmer OS Battambang",
              "Noto Sans SC","Microsoft YaHei","PingFang SC",sans-serif;
  font-size:14.5px; line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
h1,h2,h3{margin:0 0 .4rem;line-height:1.25;font-weight:650}
p{margin:0 0 .8rem}
hr{border:0;border-top:1px solid var(--line);margin:1.4rem 0}

/* ------------------------------------------------------------ LAYOUT */
.app{display:flex;min-height:100vh}
.main{flex:1;min-width:0;display:flex;flex-direction:column}
.content{padding:26px 30px;flex:1;max-width:1280px;width:100%}
.foot{
  display:flex;justify-content:space-between;gap:1rem;
  padding:18px 30px;color:var(--muted);font-size:12.5px;border-top:1px solid var(--line);
}

/* ----------------------------------------------------------- SIDEBAR */
.sidebar{
  width:252px;flex-shrink:0;background:rgba(16,19,29,.92);
  border-right:1px solid var(--line);
  display:flex;flex-direction:column;position:sticky;top:0;height:100vh;
}
.brand{display:flex;align-items:center;gap:10px;padding:20px 18px;border-bottom:1px solid var(--line)}
.brand-mark{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#0b0d14;font-weight:800;font-size:17px;line-height:1;
}
.brand-text{font-weight:680;font-size:15px}
.nav{padding:14px 10px;overflow-y:auto;flex:1}
.nav-label{
  font-size:10.5px;text-transform:uppercase;letter-spacing:.13em;
  color:var(--muted);padding:14px 10px 6px;
}
.nav a{
  display:flex;align-items:center;gap:10px;padding:9px 11px;border-radius:10px;
  color:#c3c9db;font-size:13.6px;margin-bottom:2px;transition:.15s;
}
.nav a:hover{background:var(--panel-2);color:#fff}
.nav a.active{background:linear-gradient(90deg,rgba(124,92,255,.22),rgba(124,92,255,.05));color:#fff}
.nav a.active .ico{color:var(--accent)}
.ico{width:18px;text-align:center;opacity:.85;font-size:13px}
.sidebar-foot{padding:14px;border-top:1px solid var(--line);display:grid;gap:6px}
.mode-pill{
  font-size:11px;padding:5px 9px;border-radius:8px;border:1px solid var(--line);
  background:var(--panel);color:var(--muted);
}
.mode-pill.live{color:var(--ok);border-color:rgba(52,211,153,.35)}
.mode-pill.sim{color:var(--warn);border-color:rgba(251,191,36,.30)}

/* ------------------------------------------------------------ TOPBAR */
.topbar{
  display:flex;align-items:center;gap:14px;padding:14px 30px;
  border-bottom:1px solid var(--line);background:rgba(11,13,20,.72);
  backdrop-filter:blur(8px);position:sticky;top:0;z-index:20;
}
.page-title{font-size:16.5px;margin:0;font-weight:650}
.spacer{flex:1}
.burger{
  display:none;background:var(--panel);border:1px solid var(--line);color:var(--text);
  border-radius:10px;padding:7px 11px;font-size:15px;cursor:pointer;
}
.user-chip{display:flex;align-items:center;gap:9px}
.avatar{
  width:32px;height:32px;border-radius:50%;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#0b0d14;font-weight:700;
}
.who{display:flex;flex-direction:column;line-height:1.15}
.who small{color:var(--muted);font-size:11px}

/* ------------------------------------------------------------- CARDS */
.card{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;box-shadow:var(--shadow);
}
.card + .card{margin-top:18px}
.card h2{font-size:15.5px}
.card .sub{color:var(--muted);font-size:12.8px;margin-bottom:14px}

.grid{display:grid;gap:18px}
.grid.c2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid.c3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid.c4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* -------------------------------------------------------- STAT TILES */
.stat{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);padding:18px;position:relative;overflow:hidden;
}
.stat::after{
  content:"";position:absolute;inset:auto -30px -40px auto;width:120px;height:120px;
  background:radial-gradient(circle,rgba(124,92,255,.22),transparent 70%);
}
.stat .k{color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.1em}
.stat .v{font-size:28px;font-weight:720;margin-top:6px;letter-spacing:-.5px}
.stat .d{color:var(--muted);font-size:12px;margin-top:2px}

/* ------------------------------------------------------------ TABLES */
.table-wrap{overflow-x:auto;border-radius:12px;border:1px solid var(--line)}
table{width:100%;border-collapse:collapse;font-size:13.4px;min-width:430px}
th,td{padding:11px 13px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
th{color:var(--muted);font-weight:600;font-size:11.5px;text-transform:uppercase;letter-spacing:.08em;
   background:rgba(255,255,255,.02)}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:rgba(255,255,255,.025)}
td .muted{color:var(--muted)}

/* ------------------------------------------------------------- FORMS */
label{display:block;font-size:12.5px;color:var(--muted);margin:0 0 6px}
.field{margin-bottom:15px}
input,select,textarea{
  width:100%;background:#0e111b;border:1px solid var(--line);color:var(--text);
  border-radius:10px;padding:11px 13px;font:inherit;transition:.15s;
}
input:focus,select:focus,textarea:focus{
  outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(124,92,255,.16);
}
textarea{min-height:96px;resize:vertical}
select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),
       linear-gradient(135deg,var(--muted) 50%,transparent 50%);
       background-position:calc(100% - 18px) 19px,calc(100% - 13px) 19px;
       background-size:5px 5px,5px 5px;background-repeat:no-repeat;padding-right:34px}
select.sm{background-image:none;padding:6px 9px;font-size:12px;border-radius:8px}
.row{display:grid;gap:14px;grid-template-columns:repeat(2,minmax(0,1fr))}
.hint{color:var(--muted);font-size:11.8px;margin-top:5px}

/* ----------------------------------------------------------- BUTTONS */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
  background:linear-gradient(135deg,var(--accent),#5b46d6);color:#fff;border:0;
  padding:11px 18px;border-radius:10px;font:inherit;font-weight:600;cursor:pointer;
  transition:.15s;white-space:nowrap;
}
.btn:hover{filter:brightness(1.1);transform:translateY(-1px)}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}
.btn.ghost{background:var(--panel-2);border:1px solid var(--line);color:var(--text)}
.btn.ghost:hover{background:#232941}
.btn.danger{background:linear-gradient(135deg,#ef4444,#b91c1c)}
.btn.sm{padding:7px 12px;font-size:12.5px;border-radius:9px}
.btn.block{width:100%}
.actions{display:flex;gap:8px;flex-wrap:wrap}

/* ------------------------------------------------------------ BADGES */
.badge{
  display:inline-block;padding:3px 9px;border-radius:99px;font-size:11px;font-weight:600;
  border:1px solid var(--line);background:var(--panel-2);color:var(--muted);
}
.badge.ok{color:var(--ok);border-color:rgba(52,211,153,.35);background:rgba(52,211,153,.10)}
.badge.warn{color:var(--warn);border-color:rgba(251,191,36,.35);background:rgba(251,191,36,.10)}
.badge.bad{color:var(--bad);border-color:rgba(248,113,113,.35);background:rgba(248,113,113,.10)}
.badge.info{color:var(--accent-2);border-color:rgba(34,211,238,.35);background:rgba(34,211,238,.10)}

/* ------------------------------------------------------------ ALERTS */
.alert{
  padding:12px 15px;border-radius:11px;margin-bottom:16px;font-size:13.4px;
  border:1px solid var(--line);background:var(--panel);
}
.alert.success{border-color:rgba(52,211,153,.35);background:rgba(52,211,153,.10);color:#a7f3d0}
.alert.warn{border-color:rgba(251,191,36,.35);background:rgba(251,191,36,.10);color:#fde68a}
.alert.error{border-color:rgba(248,113,113,.35);background:rgba(248,113,113,.10);color:#fecaca}

/* ------------------------------------------------------------- STORY */
.story-text{
  white-space:pre-wrap;background:#0e111b;border:1px solid var(--line);border-radius:12px;
  padding:18px 20px;max-height:520px;overflow:auto;font-size:14.5px;line-height:1.85;
}
.story-text.km{font-size:15.5px;line-height:2.05}
.story-text.zh{font-size:15.5px;line-height:1.95}

audio{width:100%;margin-top:10px;filter:invert(.92) hue-rotate(180deg)}
video{width:100%;border-radius:12px;background:#000}

/* -------------------------------------------------------------- MISC */
.page-head{display:flex;align-items:flex-start;gap:16px;margin-bottom:20px;flex-wrap:wrap}
.page-head .sub{color:var(--muted);font-size:13px}
.empty{text-align:center;padding:48px 20px;color:var(--muted)}
.empty .big{font-size:34px;opacity:.5;margin-bottom:8px}
.bar{display:block;height:8px;border-radius:99px;background:var(--panel-2);overflow:hidden}
.bar > i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent-2))}
.scrim{display:none}
.spin{display:inline-block;width:14px;height:14px;border:2px solid rgba(255,255,255,.35);
      border-top-color:#fff;border-radius:50%;animation:sp .7s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}

/* -------------------------------------------------------- AUTH PAGES */
.auth-wrap{min-height:100vh;display:grid;place-items:center;padding:28px}
.auth-card{width:100%;max-width:420px}
.auth-card .brand{border:0;padding:0 0 18px;justify-content:center}
.auth-alt{text-align:center;color:var(--muted);font-size:13px;margin-top:16px}
.auth-alt a{color:var(--accent-2)}
.demo-box{
  margin-top:16px;padding:11px 13px;border:1px dashed var(--line);border-radius:10px;
  font-size:12.2px;color:var(--muted);
}

/* -------------------------------------------------------- RESPONSIVE */
@media (max-width: 1080px){ .grid.c4{grid-template-columns:repeat(2,minmax(0,1fr))} }
@media (max-width: 900px){
  .sidebar{position:fixed;left:0;top:0;z-index:60;transform:translateX(-100%);transition:.25s}
  .sidebar.open{transform:none;box-shadow:var(--shadow)}
  .burger{display:block}
  .scrim.show{display:block;position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:50}
  .content,.topbar,.foot{padding-left:16px;padding-right:16px}
  .grid.c3,.grid.c2{grid-template-columns:1fr}
  .row{grid-template-columns:1fr}
  .who{display:none}
}
@media (max-width: 520px){
  .grid.c4{grid-template-columns:1fr}
  .stat .v{font-size:24px}
}