/* css/style.css — Premium Design System with Dark Mode */
@import url('https://fonts.googleapis.com/css2?family=Hind+Siliguri:wght@300;400;500;600;700&display=swap');

:root {
    --primary: #0d9488; --primary-hover: #0f766e; --primary-light: rgba(13,148,136,0.1);
    --secondary: #f0fdfa; --accent: #f59e0b;
    --sidebar-bg: #0f172a; --sidebar-text: #94a3b8; --sidebar-hover: #1e293b; --sidebar-active: #0d9488;
    --text: #1e293b; --text-muted: #64748b; --bg: #f1f5f9; --card: #ffffff; --border: #e2e8f0;
    --success: #10b981; --danger: #ef4444; --warning: #f59e0b; --info: #3b82f6;
    --shadow-sm: 0 1px 3px rgba(0,0,0,.06); --shadow-md: 0 4px 12px rgba(0,0,0,.07); --shadow-lg: 0 10px 25px rgba(0,0,0,.1);
    --ease: cubic-bezier(.4,0,.2,1); --sidebar-w: 260px; --sidebar-cw: 72px; --header-h: 64px; --radius: 12px;
}
[data-theme="dark"] {
    --sidebar-bg: #0a0f1a; --text: #e2e8f0; --text-muted: #94a3b8; --bg: #0f172a; --card: #1e293b; --border: #334155;
    --secondary: #1e293b; --shadow-sm: 0 1px 3px rgba(0,0,0,.3); --shadow-md: 0 4px 12px rgba(0,0,0,.4);
}
* { margin:0; padding:0; box-sizing:border-box; font-family:'Hind Siliguri',sans-serif; }
body { background:var(--bg); color:var(--text); font-size:15px; overflow-x:hidden; }
a { text-decoration:none; color:inherit; }
::selection { background:var(--primary); color:#fff; }
::-webkit-scrollbar { width:6px; } ::-webkit-scrollbar-track { background:transparent; } ::-webkit-scrollbar-thumb { background:#94a3b8; border-radius:9px; }

/* ANIMATIONS */
@keyframes fadeIn { from{opacity:0;transform:translateY(12px)} to{opacity:1;transform:translateY(0)} }
@keyframes slideIn { from{opacity:0;transform:translateX(-16px)} to{opacity:1;transform:translateX(0)} }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.5} }
@keyframes shimmer { 0%{background-position:-200% 0} 100%{background-position:200% 0} }
@keyframes scaleIn { from{opacity:0;transform:scale(.92)} to{opacity:1;transform:scale(1)} }
@keyframes slideUp { from{opacity:0;transform:translateY(20px)} to{opacity:1;transform:translateY(0)} }
.animate-fade { animation: fadeIn .4s var(--ease) both; }
.animate-slide { animation: slideIn .4s var(--ease) both; }

/* SKELETON LOADER */
.skeleton { background: linear-gradient(90deg,var(--border) 25%,var(--bg) 50%,var(--border) 75%); background-size:400% 100%; animation:shimmer 1.5s infinite; border-radius:8px; }
.skeleton-text { height:14px; margin:8px 0; border-radius:4px; }
.skeleton-card { height:100px; border-radius:var(--radius); }

/* LAYOUT */
.wrapper { display:flex; width:100%; min-height:100vh; }

/* SIDEBAR */
.sidebar {
    width:var(--sidebar-w); background:var(--sidebar-bg); color:var(--sidebar-text);
    transition:all .3s var(--ease); height:100vh; position:fixed; left:0; top:0; z-index:1000;
    overflow-y:auto; overflow-x:hidden; scrollbar-width:thin;
    border-right:1px solid rgba(255,255,255,.05);
}
.sidebar.collapsed { width:var(--sidebar-cw); }
.sidebar-header { height:var(--header-h); display:flex; align-items:center; justify-content:center; padding:0 16px; background:rgba(0,0,0,.2); }
.sidebar-logo { color:#fff; font-size:1.1rem; font-weight:700; white-space:nowrap; display:flex; align-items:center; gap:10px; }
.sidebar-logo i { font-size:1.5rem; color:var(--primary); filter:drop-shadow(0 0 8px rgba(13,148,136,.4)); }
.sidebar.collapsed .sidebar-logo span { display:none; }
.sidebar-menu { list-style:none; padding:12px 0; }
.sidebar-menu .menu-label { padding:14px 20px 6px; font-size:.68rem; text-transform:uppercase; letter-spacing:1.5px; color:#475569; font-weight:700; }
.sidebar.collapsed .menu-label { display:none; }
.sidebar-menu li { padding:2px 10px; }
.sidebar-menu a {
    color:var(--sidebar-text); display:flex; align-items:center; padding:10px 14px; border-radius:10px;
    transition:all .2s var(--ease); white-space:nowrap; font-size:.9rem; gap:4px; position:relative;
}
.sidebar-menu a:hover { background:var(--sidebar-hover); color:#fff; transform:translateX(3px); }
.sidebar-menu a.active { background:linear-gradient(135deg,var(--primary),var(--primary-hover)); color:#fff; font-weight:600; box-shadow:0 4px 12px rgba(13,148,136,.3); }
.sidebar-menu a i { font-size:1.05rem; min-width:28px; text-align:center; }
.sidebar.collapsed .sidebar-menu a span { display:none; }

/* MAIN CONTENT */
.main-content { flex:1; margin-left:var(--sidebar-w); transition:all .3s var(--ease); min-height:100vh; display:flex; flex-direction:column; }
.sidebar.collapsed ~ .main-content { margin-left:var(--sidebar-cw); }

/* HEADER */
.top-header {
    height:var(--header-h); background:var(--card); box-shadow:var(--shadow-sm);
    display:flex; align-items:center; justify-content:space-between; padding:0 24px;
    position:sticky; top:0; z-index:999; border-bottom:1px solid var(--border);
    backdrop-filter:blur(12px); background:rgba(255,255,255,.85);
}
[data-theme="dark"] .top-header { background:rgba(30,41,59,.85); }
.toggle-btn { background:none; border:none; font-size:1.2rem; color:var(--text); cursor:pointer; transition:all .2s; padding:8px; border-radius:10px; }
.toggle-btn:hover { color:var(--primary); background:var(--primary-light); }
.header-right { display:flex; align-items:center; gap:14px; }
.header-inst-name { font-weight:600; color:var(--primary); font-size:.92rem; }
.theme-toggle { background:none; border:1px solid var(--border); padding:7px 10px; border-radius:8px; cursor:pointer; font-size:1rem; transition:all .2s; color:var(--text); }
.theme-toggle:hover { background:var(--primary-light); border-color:var(--primary); }
.user-profile { display:flex; align-items:center; gap:8px; cursor:pointer; padding:6px 12px; border-radius:10px; transition:all .2s; }
.user-profile:hover { background:var(--secondary); }
.user-profile img { width:34px; height:34px; border-radius:50%; object-fit:cover; border:2px solid var(--primary-light); }
.user-profile span { font-size:.88rem; font-weight:500; }
.logout-btn { background:none; border:1px solid var(--danger); color:var(--danger); padding:6px 14px; border-radius:8px; cursor:pointer; font-size:.83rem; transition:all .2s; font-family:inherit; }
.logout-btn:hover { background:var(--danger); color:#fff; }

/* PAGE CONTENT */
.page-content { padding:24px; flex:1; animation:fadeIn .4s var(--ease); }
.page-title { margin-bottom:20px; color:var(--text); font-size:1.35rem; font-weight:700; display:flex; align-items:center; gap:10px; }
.page-title i { color:var(--primary); }
.header-actions { display:flex; justify-content:space-between; align-items:center; margin-bottom:20px; flex-wrap:wrap; gap:12px; }

/* CARDS */
.grid-cards { display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:20px; margin-bottom:24px; }
.stat-card {
    background:var(--card); border-radius:var(--radius); padding:22px; display:flex; align-items:center;
    justify-content:space-between; box-shadow:var(--shadow-sm); border:1px solid var(--border);
    transition:all .3s var(--ease); position:relative; overflow:hidden;
    animation:slideUp .5s var(--ease) both;
}
.stat-card::before { content:''; position:absolute; top:0; left:0; width:4px; height:100%; background:var(--primary); border-radius:4px 0 0 4px; }
.stat-card.accent-blue::before { background:var(--info); }
.stat-card.accent-orange::before { background:var(--warning); }
.stat-card.accent-red::before { background:var(--danger); }
.stat-card.accent-green::before { background:var(--success); }
.stat-card:hover { transform:translateY(-4px); box-shadow:var(--shadow-md); }
.stat-card:nth-child(2) { animation-delay:.1s; }
.stat-card:nth-child(3) { animation-delay:.2s; }
.stat-card:nth-child(4) { animation-delay:.3s; }
.stat-info h3 { font-size:.82rem; color:var(--text-muted); font-weight:500; margin-bottom:6px; }
.stat-info h2 { font-size:1.5rem; font-weight:700; color:var(--text); }
.stat-icon { width:50px; height:50px; border-radius:12px; display:flex; align-items:center; justify-content:center; font-size:1.3rem; background:var(--primary-light); color:var(--primary); }
.card {
    background:var(--card); border-radius:var(--radius); padding:22px; box-shadow:var(--shadow-sm);
    border:1px solid var(--border); margin-bottom:20px; transition:all .2s var(--ease);
    animation:fadeIn .4s var(--ease) both;
}
.card:hover { box-shadow:var(--shadow-md); }
.card-title { font-size:1rem; font-weight:600; margin-bottom:16px; color:var(--text); display:flex; align-items:center; gap:8px; }
.card-title i { color:var(--primary); }

/* FILTER BAR */
.filter-bar { display:flex; gap:10px; align-items:center; flex-wrap:wrap; }

/* BUTTONS */
.btn {
    padding:9px 18px; border:none; border-radius:8px; cursor:pointer; font-size:.88rem;
    font-weight:500; transition:all .25s var(--ease); display:inline-flex; align-items:center; gap:6px;
    font-family:inherit; position:relative; overflow:hidden;
}
.btn::after { content:''; position:absolute; inset:0; background:rgba(255,255,255,.15); opacity:0; transition:opacity .2s; }
.btn:hover::after { opacity:1; }
.btn:active { transform:scale(.96); }
.btn-primary { background:linear-gradient(135deg,var(--primary),var(--primary-hover)); color:#fff; box-shadow:0 2px 8px rgba(13,148,136,.25); }
.btn-primary:hover { box-shadow:0 4px 16px rgba(13,148,136,.35); }
.btn-success { background:linear-gradient(135deg,#10b981,#059669); color:#fff; }
.btn-danger { background:linear-gradient(135deg,#ef4444,#dc2626); color:#fff; }
.btn-secondary { background:var(--bg); color:var(--text); border:1px solid var(--border); }
.btn-outline { background:transparent; border:1px solid var(--border); color:var(--text); }
.btn-outline:hover { border-color:var(--primary); color:var(--primary); }
.btn-sm { padding:6px 12px; font-size:.8rem; }
.btn-icon { padding:6px 10px; }

/* FORMS */
.form-group { margin-bottom:16px; }
.form-label { display:block; margin-bottom:6px; font-weight:500; font-size:.88rem; color:var(--text); }
.form-control {
    width:100%; padding:10px 14px; border:1.5px solid var(--border); border-radius:8px;
    font-size:.9rem; transition:all .2s var(--ease); background:var(--card); color:var(--text); font-family:inherit;
}
.form-control:focus { outline:none; border-color:var(--primary); box-shadow:0 0 0 3px var(--primary-light); }
.form-grid { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.form-grid .full-width { grid-column:1/-1; }
textarea.form-control { resize:vertical; }

/* TABLES */
.table-responsive { overflow-x:auto; }
table { width:100%; border-collapse:collapse; font-size:.88rem; }
thead { background:var(--bg); }
th { padding:12px 14px; text-align:left; font-weight:600; font-size:.8rem; text-transform:uppercase; letter-spacing:.5px; color:var(--text-muted); border-bottom:2px solid var(--border); }
td { padding:11px 14px; border-bottom:1px solid var(--border); vertical-align:middle; }
tr { transition:background .15s; }
tbody tr:hover { background:var(--secondary); }
.empty-state { text-align:center; padding:40px 20px; color:var(--text-muted); }
.empty-state i { font-size:2.5rem; opacity:.3; display:block; margin-bottom:10px; }

/* BADGES */
.badge { padding:4px 10px; border-radius:6px; font-size:.76rem; font-weight:600; display:inline-block; }
.badge-primary { background:var(--primary-light); color:var(--primary); }
.badge-success { background:rgba(16,185,129,.1); color:#059669; }
.badge-danger { background:rgba(239,68,68,.1); color:#dc2626; }
.badge-warning { background:rgba(245,158,11,.1); color:#d97706; }
.badge-info { background:rgba(59,130,246,.1); color:#2563eb; }

/* MODALS */
.modal-overlay { position:fixed; inset:0; background:rgba(0,0,0,.5); backdrop-filter:blur(4px); z-index:2000; display:none; align-items:center; justify-content:center; padding:20px; }
.modal-overlay.active { display:flex; }
.modal { background:var(--card); border-radius:var(--radius); padding:28px; width:100%; max-width:550px; max-height:90vh; overflow-y:auto; animation:scaleIn .25s var(--ease); box-shadow:var(--shadow-lg); border:1px solid var(--border); }
.modal-header { display:flex; justify-content:space-between; align-items:center; margin-bottom:20px; padding-bottom:14px; border-bottom:1px solid var(--border); }
.modal-header h3 { font-size:1.1rem; display:flex; align-items:center; gap:8px; }
.modal-close { background:none; border:none; font-size:1.5rem; cursor:pointer; color:var(--text-muted); transition:all .2s; padding:4px 8px; border-radius:6px; }
.modal-close:hover { color:var(--danger); background:rgba(239,68,68,.1); }

/* TABS */
.tabs { display:flex; gap:4px; margin-bottom:20px; flex-wrap:wrap; background:var(--card); padding:4px; border-radius:var(--radius); border:1px solid var(--border); }
.tab-btn {
    padding:9px 18px; border:none; background:transparent; cursor:pointer; font-size:.88rem;
    font-weight:500; border-radius:8px; transition:all .2s var(--ease); color:var(--text-muted); font-family:inherit;
}
.tab-btn:hover { color:var(--text); background:var(--bg); }
.tab-btn.active { background:var(--primary); color:#fff; box-shadow:0 2px 8px rgba(13,148,136,.2); }
.tab-content { display:none; animation:fadeIn .3s var(--ease); }
.tab-content.active { display:block; }

/* TOAST */
.toast-container { position:fixed; top:20px; right:20px; z-index:9999; display:flex; flex-direction:column; gap:8px; }
.toast { padding:14px 20px; border-radius:10px; box-shadow:var(--shadow-md); display:flex; align-items:center; gap:10px; font-size:.88rem; transform:translateX(120%); transition:transform .35s var(--ease); background:var(--card); border:1px solid var(--border); min-width:280px; }
.toast.show { transform:translateX(0); }

/* QUICK ACTIONS */
.quick-actions { display:grid; grid-template-columns:repeat(auto-fit,minmax(140px,1fr)); gap:12px; margin-bottom:24px; }
.quick-action {
    display:flex; flex-direction:column; align-items:center; gap:8px; padding:18px 12px;
    background:var(--card); border:1px solid var(--border); border-radius:var(--radius);
    cursor:pointer; transition:all .25s var(--ease); text-decoration:none; color:var(--text);
}
.quick-action i { font-size:1.5rem; color:var(--primary); }
.quick-action span { font-size:.82rem; font-weight:500; text-align:center; }
.quick-action:hover { border-color:var(--primary); transform:translateY(-3px); box-shadow:var(--shadow-md); background:var(--primary-light); }

/* LOGIN */
.login-wrapper { min-height:100vh; display:flex; align-items:center; justify-content:center; background:linear-gradient(135deg,#0f172a 0%,#1e293b 50%,#0f766e 100%); padding:20px; position:relative; }
.login-wrapper::before { content:''; position:absolute; inset:0; background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E"); }
.login-card {
    background:rgba(255,255,255,.08); backdrop-filter:blur(20px); border:1px solid rgba(255,255,255,.12);
    border-radius:20px; padding:40px; width:100%; max-width:420px; color:#fff; position:relative;
    box-shadow:0 20px 60px rgba(0,0,0,.3);
}
.login-logo { text-align:center; margin-bottom:30px; }
.login-logo i { font-size:3rem; color:var(--primary); filter:drop-shadow(0 0 20px rgba(13,148,136,.4)); margin-bottom:12px; display:block; }
.login-logo h2 { font-size:1.5rem; margin-bottom:4px; }
.login-logo p { font-size:.85rem; opacity:.7; }
.login-form .form-group { margin-bottom:18px; }
.login-form .form-label { color:rgba(255,255,255,.8); font-size:.85rem; }
.login-form .form-control { background:rgba(255,255,255,.08); border:1px solid rgba(255,255,255,.15); color:#fff; padding:12px 16px; }
.login-form .form-control::placeholder { color:rgba(255,255,255,.35); }
.login-form .form-control:focus { border-color:var(--primary); box-shadow:0 0 0 3px rgba(13,148,136,.2); background:rgba(255,255,255,.12); }
.login-form .btn-primary { width:100%; padding:13px; font-size:1rem; margin-top:8px; }
.login-error { background:rgba(239,68,68,.15); border:1px solid rgba(239,68,68,.3); color:#fca5a5; padding:10px 14px; border-radius:8px; font-size:.85rem; margin-bottom:16px; display:none; }
.password-toggle { position:absolute; right:12px; top:50%; transform:translateY(-50%); background:none; border:none; color:rgba(255,255,255,.5); cursor:pointer; font-size:1rem; }

/* WEBSITE NAV */
.website-nav { background:var(--sidebar-bg); padding:16px 30px; display:flex; justify-content:space-between; align-items:center; position:sticky; top:0; z-index:100; }
.website-nav .logo { color:#fff; font-size:1.2rem; font-weight:700; display:flex; align-items:center; gap:10px; }
.website-nav .logo i { color:var(--primary); font-size:1.4rem; }
.nav-links { display:flex; gap:20px; align-items:center; }
.nav-links a { color:var(--sidebar-text); font-size:.9rem; transition:color .2s; }
.nav-links a:hover { color:#fff; }

/* PRINT */
@media print {
    body { background:#fff!important; color:#000!important; font-size:12pt; }
    .sidebar,.top-header,.tabs,.no-print,.toast-container,.quick-actions { display:none!important; }
    .main-content { margin:0!important; }
    .page-content { padding:0!important; }
    .card { box-shadow:none!important; border:1px solid #ddd!important; break-inside:avoid; }
    .stat-card { break-inside:avoid; }
    .modal-overlay { position:static!important; display:block!important; background:none!important; }
    .modal { box-shadow:none!important; max-width:none!important; padding:0!important; }
}

/* ID CARD PRINT */
.id-card { width:340px; border:2px solid var(--primary); border-radius:12px; overflow:hidden; background:#fff; font-size:12px; }
.id-card-header { background:linear-gradient(135deg,var(--primary),var(--primary-hover)); color:#fff; padding:10px; text-align:center; }
.id-card-body { padding:12px; display:flex; gap:10px; }
.id-card-photo { width:80px; height:90px; border:2px solid var(--border); border-radius:6px; object-fit:cover; }
.id-card-info { flex:1; font-size:11px; line-height:1.6; }
.id-card-footer { background:var(--bg); padding:6px 10px; text-align:center; font-size:10px; border-top:1px solid var(--border); }

/* RESPONSIVE */
@media(max-width:768px) {
    .sidebar { transform:translateX(-100%); }
    .sidebar.mobile-open { transform:translateX(0); box-shadow:4px 0 20px rgba(0,0,0,.3); }
    .main-content { margin-left:0!important; }
    .page-content { padding:16px; }
    .top-header { padding:0 16px; }
    .form-grid { grid-template-columns:1fr; }
    .grid-cards { grid-template-columns:1fr; }
    .stat-card { padding:16px; }
    .header-inst-name { display:none; }
    .quick-actions { grid-template-columns:repeat(2,1fr); }
    .tabs { overflow-x:auto; flex-wrap:nowrap; }
    .tab-btn { white-space:nowrap; flex-shrink:0; }
}
@media(max-width:480px) {
    .header-right .user-profile span { display:none; }
    .logout-btn span { display:none; }
    .quick-actions { grid-template-columns:1fr 1fr; }
}