/* ============================================================
   Vidya Setu — Student Management System
   Design tokens
   ============================================================ */
:root{
  --ink:        #16223f;   /* primary navy */
  --ink-2:      #1f2f57;   /* lighter navy panel */
  --paper:      #f2f4f7;   /* app background */
  --paper-card: #ffffff;
  --line:       #dfe3ea;
  --text:       #212a3d;
  --text-dim:   #5b6478;
  --marigold:   #e8a33d;   /* accent */
  --marigold-dk:#c8842a;
  --margin-red: #c24b4b;   /* register margin line */
  --good:       #3e8e5a;
  --bad:        #c24545;
  --warn:       #c8842a;

  --font-display: 'Space Grotesk', 'Poppins', sans-serif;
  --font-body:    'Inter', system-ui, sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;

  --radius: 10px;
  --shadow: 0 1px 2px rgba(22,34,63,0.06), 0 8px 24px -12px rgba(22,34,63,0.18);
}

*{ box-sizing: border-box; }
html,body{ margin:0; padding:0; }
body{
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}
h1,h2,h3,h4{ font-family: var(--font-display); margin:0; color: var(--ink); }
a{ color: inherit; }
button{ font-family: var(--font-body); cursor:pointer; }
::selection{ background: var(--marigold); color:#fff; }

.mono{ font-family: var(--font-mono); letter-spacing:.02em; }

/* ---------- Login page ---------- */
.login-wrap{
  min-height:100vh;
  display:grid;
  grid-template-columns: 1.1fr 1fr;
}
@media (max-width: 860px){
  .login-wrap{ grid-template-columns: 1fr; }
  .login-side{ display:none; }
}
.login-side{
  background: linear-gradient(160deg, var(--ink) 0%, var(--ink-2) 60%, #24365f 100%);
  color:#f2f4f7;
  padding: 56px;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  position:relative;
  overflow:hidden;
}
.login-side::after{
  content:"";
  position:absolute; inset:0;
  background-image: repeating-linear-gradient(180deg, rgba(232,163,61,0.06) 0 2px, transparent 2px 34px);
  pointer-events:none;
}
.brand{
  display:flex; align-items:center; gap:12px;
}
.brand-mark{
  width:42px; height:42px; border-radius:9px;
  background: var(--marigold);
  display:flex; align-items:center; justify-content:center;
  font-family: var(--font-display); font-weight:700; color: var(--ink);
  font-size:18px;
}
.brand-name{ font-family: var(--font-display); font-size:20px; font-weight:600; letter-spacing:.01em; }
.brand-sub{ color:#b9c2d9; font-size:13px; margin-top:2px; }

.login-quote{ max-width: 420px; position:relative; z-index:1;}
.login-quote .eyebrow{ color: var(--marigold); font-size:12px; letter-spacing:.14em; text-transform:uppercase; font-weight:600; }
.login-quote h2{ color:#fff; font-size:30px; line-height:1.25; margin-top:10px; font-weight:600; }
.login-quote p{ color:#b9c2d9; margin-top:14px; line-height:1.6; font-size:14.5px; }

.login-foot{ color:#8b96b3; font-size:12.5px; position:relative; z-index:1; }

.login-form-col{
  display:flex; align-items:center; justify-content:center;
  padding: 40px;
}
.login-card{ width:100%; max-width: 380px; }
.login-card h1{ font-size:24px; margin-bottom:6px; }
.login-card .lead{ color: var(--text-dim); font-size:14px; margin-bottom:28px; }

.field{ margin-bottom:16px; }
.field label{ display:block; font-size:12.5px; font-weight:600; color: var(--text-dim); margin-bottom:6px; text-transform:uppercase; letter-spacing:.04em; }
.field input, .field select{
  width:100%; padding:11px 13px; border-radius:8px;
  border:1.5px solid var(--line); font-size:14.5px; background:#fff; color:var(--text);
}
.field input:focus, .field select:focus{ outline:2px solid var(--marigold); outline-offset:1px; border-color:var(--marigold); }

.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:11px 18px; border-radius:8px; border:none; font-weight:600; font-size:14.5px;
  transition: transform .06s ease, box-shadow .15s ease;
}
.btn:active{ transform: translateY(1px); }
.btn-primary{ background: var(--marigold); color: var(--ink); width:100%; }
.btn-primary:hover{ background: var(--marigold-dk); }
.btn-ghost{ background:transparent; color: var(--ink); border:1.5px solid var(--line); }
.btn-ghost:hover{ border-color: var(--ink); }
.btn-danger{ background:#fdecec; color: var(--bad); }
.btn-danger:hover{ background:#fadbdb; }
.btn-sm{ padding:7px 12px; font-size:13px; }

.msg{ font-size:13.5px; padding:10px 12px; border-radius:8px; margin-bottom:14px; }
.msg-error{ background:#fdecec; color:#8a2b2b; }
.msg-ok{ background:#e8f5ec; color:#245c38; }

.hint{ font-size:12.5px; color: var(--text-dim); margin-top:18px; line-height:1.6; }
.hint code{ background:#eef1f6; padding:1px 5px; border-radius:4px; }

/* ---------- App shell ---------- */
.app{ display:grid; grid-template-columns: 236px 1fr; min-height:100vh; }
@media (max-width: 780px){
  .app{ grid-template-columns: 1fr; }
  .sidebar{ display:none; }
  .sidebar.open{ display:block; position:fixed; z-index:50; inset:0 20% 0 0; }
}
.sidebar{
  background: var(--ink);
  color:#dfe4f0;
  padding: 22px 16px;
  display:flex; flex-direction:column; gap:22px;
}
.sidebar .brand{ padding: 0 4px 12px; border-bottom:1px solid rgba(255,255,255,0.08); }
.sidebar .brand-name{ font-size:16px; }
.sidebar .brand-sub{ font-size:11.5px; }

.nav{ display:flex; flex-direction:column; gap:2px; }
.nav a{
  display:flex; align-items:center; gap:10px;
  padding:10px 12px; border-radius:8px; text-decoration:none;
  color:#c2c9dc; font-size:14px; font-weight:500;
}
.nav a .ic{ width:18px; text-align:center; opacity:.85; }
.nav a:hover{ background: rgba(255,255,255,0.06); color:#fff; }
.nav a.active{ background: var(--marigold); color: var(--ink); font-weight:600; }
.nav a.active .ic{ opacity:1; }

.sidebar-foot{ margin-top:auto; border-top:1px solid rgba(255,255,255,0.08); padding-top:14px; }
.who{ font-size:13px; color:#fff; font-weight:600; }
.who-role{ font-size:11.5px; color:#8b96b3; margin-bottom:10px; }

.main{ padding: 28px 32px 60px; max-width: 1180px; }
.topbar{ display:flex; align-items:center; justify-content:space-between; margin-bottom:22px; flex-wrap:wrap; gap:12px; }
.topbar h1{ font-size:22px; }
.topbar .sub{ color: var(--text-dim); font-size:13.5px; margin-top:3px; }

.grid{ display:grid; gap:16px; }
.stat-grid{ grid-template-columns: repeat(4, 1fr); margin-bottom:22px; }
@media (max-width: 900px){ .stat-grid{ grid-template-columns: repeat(2,1fr); } }
.stat-card{
  background: var(--paper-card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding:18px; border-left: 4px solid var(--marigold);
}
.stat-card .num{ font-family: var(--font-display); font-size:26px; font-weight:700; color:var(--ink); }
.stat-card .label{ font-size:12.5px; color:var(--text-dim); margin-top:2px; }
.stat-card.alt{ border-left-color: var(--good); }
.stat-card.warn{ border-left-color: var(--warn); }
.stat-card.bad{ border-left-color: var(--bad); }

.card{ background: var(--paper-card); border-radius: var(--radius); box-shadow: var(--shadow); padding:22px; }
.card + .card{ margin-top:18px; }
.card-head{ display:flex; align-items:center; justify-content:space-between; margin-bottom:16px; flex-wrap:wrap; gap:10px; }
.card-head h3{ font-size:16px; }
.card-head .sub{ font-size:12.5px; color:var(--text-dim); }

.toolbar{ display:flex; gap:10px; flex-wrap:wrap; align-items:center; }
.toolbar input, .toolbar select{
  padding:9px 12px; border-radius:8px; border:1.5px solid var(--line); font-size:13.5px; background:#fff;
}

/* ---------- Register-style table (signature element) ---------- */
.register{ position:relative; overflow-x:auto; border-radius: 8px; }
.register table{
  width:100%; border-collapse:collapse; font-size:13.5px;
  background: repeating-linear-gradient(180deg, #fff 0 40px, #fbfbfa 40px 80px);
}
.register th{
  text-align:left; font-size:11px; text-transform:uppercase; letter-spacing:.06em;
  color: var(--text-dim); font-weight:700; padding:10px 12px; border-bottom:2px solid var(--ink);
  background:#fff; position:sticky; top:0;
}
.register td{ padding:10px 12px; border-bottom:1px solid var(--line); vertical-align:middle; }
.register th:first-child, .register td:first-child{ border-left: 3px solid var(--margin-red); }
.register tr:hover td{ background: #fbf6ea; }

.badge{ display:inline-flex; align-items:center; gap:5px; padding:3px 9px; border-radius:99px; font-size:11.5px; font-weight:600; }
.badge-good{ background:#e8f5ec; color:var(--good); }
.badge-bad{ background:#fdecec; color:var(--bad); }
.badge-warn{ background:#fdf3e2; color:var(--marigold-dk); }
.badge-neutral{ background:#eef1f6; color:var(--text-dim); }

.roll{ font-family: var(--font-mono); font-size:12.5px; background:#eef1f6; padding:2px 7px; border-radius:5px; color:var(--ink-2); }

.icon-btn{ background:none; border:none; color:var(--text-dim); font-size:14px; padding:4px 6px; border-radius:6px; }
.icon-btn:hover{ background:#eef1f6; color:var(--ink); }

.empty{ text-align:center; padding: 40px 20px; color: var(--text-dim); }
.empty .big{ font-size:32px; margin-bottom:8px; }

.modal-bg{
  position:fixed; inset:0; background:rgba(22,34,63,0.5); display:none;
  align-items:center; justify-content:center; z-index:100; padding:20px;
}
.modal-bg.open{ display:flex; }
.modal{ background:#fff; border-radius:12px; padding:26px; width:100%; max-width:460px; max-height:88vh; overflow-y:auto; }
.modal h3{ margin-bottom:4px; }
.modal .close-x{ float:right; background:none; border:none; font-size:20px; color:var(--text-dim); cursor:pointer; }

.two-col{ display:grid; grid-template-columns:1fr 1fr; gap:12px; }
@media (max-width:520px){ .two-col{ grid-template-columns:1fr; } }

.mb-tabs{ display:flex; gap:6px; margin-bottom:18px; border-bottom:1px solid var(--line); }
.mb-tabs button{ background:none; border:none; padding:10px 4px; margin-right:18px; font-size:14px; color:var(--text-dim); font-weight:600; border-bottom:2px solid transparent; }
.mb-tabs button.active{ color:var(--ink); border-bottom-color: var(--marigold); }

.menu-btn{ display:none; background:var(--ink); color:#fff; border:none; border-radius:8px; padding:9px 12px; }
@media (max-width:780px){ .menu-btn{ display:inline-flex; } }

footer.demo-note{
  font-size:12px; color:var(--text-dim); text-align:center; padding: 24px 0 4px;
}