/* ================================================
   AD-Supervision — Main Stylesheet
   Theme: Dark Navy sidebar, Blue accent #3b82f6
   ================================================ */

:root {
    --color-accent:       #3b82f6;
    --color-accent-dark:  #2563eb;
    --color-accent-soft:  rgba(59,130,246,0.12);
    --color-success:      #10b981;
    --color-danger:       #ef4444;
    --color-warning:      #f59e0b;
    --color-info:         #06b6d4;

    --sidebar-bg:         linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
    --sidebar-width:      240px;
    --sidebar-text:       #94a3b8;
    --sidebar-text-hover: #f1f5f9;
    --sidebar-active-bg:  rgba(59,130,246,0.18);
    --sidebar-active-txt: #3b82f6;
    --sidebar-border:     rgba(148,163,184,0.1);

    --bg-primary:         #ffffff;
    --bg-secondary:       #f8fafc;
    --bg-tertiary:        #f1f5f9;
    --border-color:       #e2e8f0;
    --text-primary:       #0f172a;
    --text-secondary:     #64748b;
    --text-tertiary:      #94a3b8;

    --topbar-height:      56px;
    --radius-sm:          6px;
    --radius-md:          10px;
    --radius-lg:          14px;
    --shadow-sm:          0 1px 3px rgba(0,0,0,0.08);
    --shadow-md:          0 4px 16px rgba(0,0,0,0.1);
    --transition:         0.18s ease;
}

[data-theme="dark"] {
    --bg-primary:     #0f172a;
    --bg-secondary:   #1e293b;
    --bg-tertiary:    #293548;
    --border-color:   #334155;
    --text-primary:   #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary:  #64748b;
    --shadow-sm:      0 1px 3px rgba(0,0,0,0.3);
    --shadow-md:      0 4px 16px rgba(0,0,0,0.4);
}

/* ---- Reset & Base ---- */
*,*::before,*::after { box-sizing:border-box; margin:0; padding:0; }
html { font-size:16px; scroll-behavior:smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}
a { color: var(--color-accent); text-decoration:none; }
a:hover { text-decoration:underline; }
code { font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace; background: var(--bg-tertiary); padding:1px 5px; border-radius:3px; }

/* ---- Layout ---- */
.app { display:flex; min-height:100vh; }

/* ---- Sidebar ---- */
.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 200;
    transition: width var(--transition);
    overflow: hidden;
}
.sidebar.collapsed { width: 60px; }

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 18px 16px;
    border-bottom: 1px solid var(--sidebar-border);
    min-height: var(--topbar-height);
}
.sidebar-logo-icon {
    width: 32px; height: 32px; flex-shrink: 0;
    background: var(--color-accent);
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: 0.9rem;
}
.sidebar-logo-text {
    color: #f1f5f9;
    font-weight: 700;
    font-size: 0.9375rem;
    white-space: nowrap;
    overflow: hidden;
}
.sidebar-logo-sub {
    font-size: 0.7rem;
    color: var(--sidebar-text);
    font-weight: 400;
    display: block;
    margin-top: 1px;
}
.sidebar.collapsed .sidebar-logo-text { display:none; }

.sidebar-nav { flex: 1; padding: 12px 8px; overflow-y: auto; }
.sidebar-nav::-webkit-scrollbar { width:3px; }
.sidebar-nav::-webkit-scrollbar-track { background:transparent; }
.sidebar-nav::-webkit-scrollbar-thumb { background:rgba(148,163,184,0.2); border-radius:2px; }

.nav-section-label {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--sidebar-text);
    padding: 12px 10px 6px;
    white-space: nowrap;
    overflow: hidden;
}
.sidebar.collapsed .nav-section-label { visibility:hidden; }

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 10px;
    border-radius: var(--radius-sm);
    color: var(--sidebar-text);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition);
    white-space: nowrap;
    overflow: hidden;
    margin-bottom: 2px;
    cursor: pointer;
    text-decoration: none;
}
.nav-item:hover { background: rgba(255,255,255,0.06); color: var(--sidebar-text-hover); text-decoration:none; }
.nav-item.active { background: var(--sidebar-active-bg); color: var(--sidebar-active-txt); }
.nav-item i { width: 18px; text-align: center; flex-shrink: 0; font-size: 0.9rem; }
.nav-item-text { white-space: nowrap; overflow: hidden; }
.sidebar.collapsed .nav-item-text { display:none; }

.sidebar-footer {
    padding: 12px 8px;
    border-top: 1px solid var(--sidebar-border);
}
.sidebar-footer .nav-item { font-size: 0.8125rem; }

/* ---- Main ---- */
.main {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: margin-left var(--transition);
}
.sidebar.collapsed ~ .main { margin-left: 60px; }

/* ---- Topbar ---- */
.topbar {
    height: var(--topbar-height);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 20px;
    gap: 12px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}
.topbar-toggle {
    background: none; border: none; cursor: pointer;
    width: 32px; height: 32px; display:flex; align-items:center; justify-content:center;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: all var(--transition);
    flex-shrink: 0;
}
.topbar-toggle:hover { background: var(--bg-tertiary); color: var(--text-primary); }

.topbar-breadcrumb { font-size:0.875rem; color:var(--text-secondary); flex:1; }
.topbar-breadcrumb strong { color: var(--text-primary); }

.topbar-actions { display:flex; align-items:center; gap:8px; }

.topbar-btn {
    background: none; border: none; cursor: pointer;
    width: 34px; height: 34px; border-radius: var(--radius-sm);
    display:flex; align-items:center; justify-content:center;
    color: var(--text-secondary); font-size: 0.9rem;
    transition: all var(--transition); position:relative;
}
.topbar-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }

.topbar-user {
    display:flex; align-items:center; gap:8px;
    padding: 5px 8px; border-radius: var(--radius-sm);
    cursor:pointer; transition: background var(--transition);
    position:relative;
}
.topbar-user:hover { background: var(--bg-tertiary); }
.topbar-avatar {
    width:30px; height:30px; border-radius:50%;
    background: var(--color-accent-soft);
    color: var(--color-accent);
    display:flex; align-items:center; justify-content:center;
    font-weight:700; font-size:0.8125rem;
}
.topbar-username { font-size:0.875rem; font-weight:500; }

/* Dropdown */
.dropdown { position:relative; }
.dropdown-menu {
    position:absolute; top:calc(100% + 6px); right:0;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    min-width:180px;
    padding: 6px;
    z-index:300;
    display:none;
}
.dropdown-menu.show { display:block; }
.dropdown-item {
    display:flex; align-items:center; gap:8px;
    padding: 8px 10px; border-radius: var(--radius-sm);
    font-size:0.875rem; color:var(--text-primary);
    cursor:pointer; transition: background var(--transition);
    text-decoration:none;
}
.dropdown-item:hover { background: var(--bg-tertiary); text-decoration:none; }
.dropdown-item i { width:16px; color:var(--text-secondary); }
.dropdown-divider { height:1px; background:var(--border-color); margin:4px 0; }

/* ---- Breadcrumbs ---- */
.breadcrumbs {
    padding: 10px 20px;
    display:flex; align-items:center; gap:6px;
    font-size:0.8125rem; color:var(--text-secondary);
    background: var(--bg-secondary);
}
.breadcrumbs a { color:var(--text-secondary); transition:color var(--transition); }
.breadcrumbs a:hover { color:var(--color-accent); text-decoration:none; }
.breadcrumbs .separator { color:var(--text-tertiary); font-size:0.625rem; }
.breadcrumbs .current { color:var(--text-primary); font-weight:500; }

/* ---- Content ---- */
.content { padding: 20px; flex:1; }

/* ---- Page Title ---- */
.page-title {
    display:flex; align-items:center; justify-content:space-between;
    margin-bottom: 20px; gap:12px; flex-wrap:wrap;
}
.page-title h1 { font-size:1.25rem; font-weight:700; display:flex; align-items:center; }
.page-title-actions { display:flex; gap:8px; flex-wrap:wrap; }

/* ---- Cards ---- */
.card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: 20px;
}
.card-header {
    display:flex; align-items:center; justify-content:space-between;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    gap:10px;
}
.card-header h2 { font-size:0.9375rem; font-weight:600; }

/* ---- Stat Grid ---- */
.stat-grid {
    display:grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}
.stat-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 18px 20px;
    box-shadow: var(--shadow-sm);
    display:flex; flex-direction:column; gap:6px;
    border-left: 3px solid var(--color-accent);
    transition: box-shadow var(--transition);
}
.stat-card:hover { box-shadow: var(--shadow-md); }
.stat-card.success { border-left-color: var(--color-success); }
.stat-card.danger  { border-left-color: var(--color-danger); }
.stat-card.warning { border-left-color: var(--color-warning); }
.stat-card.info    { border-left-color: var(--color-info); }

.stat-card-icon { font-size:1.125rem; color:var(--color-accent); margin-bottom:4px; }
.stat-card.success .stat-card-icon { color:var(--color-success); }
.stat-card.danger  .stat-card-icon { color:var(--color-danger); }
.stat-card.warning .stat-card-icon { color:var(--color-warning); }
.stat-card.info    .stat-card-icon { color:var(--color-info); }

.stat-card-value { font-size:1.75rem; font-weight:700; line-height:1; }
.stat-card-label { font-size:0.8125rem; color:var(--text-secondary); }

/* ---- Tables ---- */
.table-responsive { overflow-x:auto; }
table { width:100%; border-collapse:collapse; }
thead tr { border-bottom:2px solid var(--border-color); }
thead th {
    padding: 10px 16px;
    text-align:left;
    font-size:0.75rem;
    font-weight:600;
    text-transform:uppercase;
    letter-spacing:0.05em;
    color: var(--text-secondary);
    white-space:nowrap;
}
tbody tr {
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition);
}
tbody tr:last-child { border-bottom:none; }
tbody tr:hover { background: var(--bg-secondary); }
tbody td { padding: 11px 16px; font-size:0.875rem; }

/* ---- Badges ---- */
.badge {
    display:inline-flex; align-items:center; gap:4px;
    padding: 2px 9px;
    border-radius: 100px;
    font-size:0.75rem;
    font-weight:600;
    line-height:1.6;
    white-space:nowrap;
}
.badge-success { background:rgba(16,185,129,0.12); color:#059669; }
.badge-danger  { background:rgba(239,68,68,0.12);  color:#dc2626; }
.badge-warning { background:rgba(245,158,11,0.12); color:#d97706; }
.badge-info    { background:rgba(6,182,212,0.12);  color:#0891b2; }
.badge-neutral { background:var(--bg-tertiary);    color:var(--text-secondary); }

/* ---- Buttons ---- */
.btn {
    display:inline-flex; align-items:center; gap:6px;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size:0.875rem; font-weight:500;
    border:none; cursor:pointer;
    transition: all var(--transition);
    text-decoration:none; white-space:nowrap;
    line-height:1;
}
.btn:hover { text-decoration:none; }
.btn-primary { background:var(--color-accent); color:#fff; }
.btn-primary:hover { background:var(--color-accent-dark); }
.btn-secondary { background:var(--bg-tertiary); color:var(--text-primary); border:1px solid var(--border-color); }
.btn-secondary:hover { background:var(--border-color); }
.btn-ghost { background:transparent; color:var(--text-secondary); }
.btn-ghost:hover { background:var(--bg-tertiary); color:var(--text-primary); }
.btn-danger { background:var(--color-danger); color:#fff; }
.btn-danger:hover { background:#dc2626; }
.btn-sm { padding:5px 10px; font-size:0.8125rem; }
.btn-lg { padding:11px 22px; font-size:1rem; }
.btn:disabled { opacity:0.5; cursor:not-allowed; }

/* ---- Forms ---- */
.form-group { display:flex; flex-direction:column; gap:6px; margin-bottom:16px; }
.form-label { font-size:0.875rem; font-weight:500; color:var(--text-primary); }
.form-control {
    width:100%; padding:9px 12px;
    background:var(--bg-primary); border:1px solid var(--border-color);
    border-radius:var(--radius-sm); font-size:0.875rem; color:var(--text-primary);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline:none;
}
.form-control:focus { border-color:var(--color-accent); box-shadow:0 0 0 3px var(--color-accent-soft); }
.form-control::placeholder { color:var(--text-tertiary); }
select.form-control { cursor:pointer; }

/* ---- Empty State ---- */
.empty-state {
    text-align:center; padding:48px 24px;
    color: var(--text-secondary);
}
.empty-state h3 { font-size:1rem; font-weight:600; color:var(--text-primary); margin-bottom:6px; }
.empty-state p { font-size:0.875rem; }
.empty-state svg { margin:0 auto 16px; display:block; color:var(--text-tertiary); }

/* ---- Alerts ---- */
.alert {
    padding:12px 16px; border-radius:var(--radius-md);
    display:flex; align-items:flex-start; gap:10px;
    font-size:0.875rem; margin-bottom:12px;
}
.alert-success { background:rgba(16,185,129,0.08); border:1px solid rgba(16,185,129,0.2); color:#065f46; }
.alert-danger  { background:rgba(239,68,68,0.08);  border:1px solid rgba(239,68,68,0.2);  color:#991b1b; }
.alert-warning { background:rgba(245,158,11,0.08); border:1px solid rgba(245,158,11,0.2); color:#92400e; }
.alert-info    { background:rgba(59,130,246,0.08); border:1px solid rgba(59,130,246,0.2); color:#1e40af; }

/* ---- Footer ---- */
.app-footer {
    padding:16px 20px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
    text-align:center;
    font-size:0.75rem;
    color:var(--text-tertiary);
}

/* ---- Toast ---- */
.toast-container {
    position:fixed; bottom:20px; right:20px;
    z-index:9999; display:flex; flex-direction:column; gap:8px;
}
.toast {
    background:var(--bg-primary); border:1px solid var(--border-color);
    border-radius:var(--radius-md); padding:12px 16px;
    box-shadow:var(--shadow-md); font-size:0.875rem;
    display:flex; align-items:center; gap:10px;
    animation: slideIn 0.2s ease;
    max-width:320px;
}
.toast.success { border-left:3px solid var(--color-success); }
.toast.error   { border-left:3px solid var(--color-danger); }
.toast.warning { border-left:3px solid var(--color-warning); }
@keyframes slideIn { from { transform:translateX(40px); opacity:0; } to { transform:translateX(0); opacity:1; } }

/* ---- Login Page ---- */
.login-page {
    min-height:100vh; display:flex; align-items:center; justify-content:center;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 60%, #0f2044 100%);
}
.login-card {
    background:rgba(255,255,255,0.03); backdrop-filter:blur(12px);
    border:1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding:40px 36px; width:100%; max-width:400px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.login-logo {
    text-align:center; margin-bottom:28px;
}
.login-logo-icon {
    width:52px; height:52px; background:var(--color-accent);
    border-radius:12px; display:inline-flex; align-items:center; justify-content:center;
    font-size:1.375rem; color:#fff; margin-bottom:12px;
}
.login-logo h1 { color:#f1f5f9; font-size:1.375rem; font-weight:700; }
.login-logo p  { color:#94a3b8; font-size:0.875rem; margin-top:4px; }
.login-card .form-label { color:#cbd5e1; }
.login-card .form-control {
    background:rgba(255,255,255,0.06); border-color:rgba(255,255,255,0.1); color:#f1f5f9;
}
.login-card .form-control:focus { border-color:var(--color-accent); }
.login-card .form-control::placeholder { color:#475569; }
.login-error {
    background:rgba(239,68,68,0.12); border:1px solid rgba(239,68,68,0.25);
    color:#fca5a5; border-radius:var(--radius-sm); padding:10px 14px;
    font-size:0.875rem; margin-bottom:16px; display:flex; align-items:center; gap:8px;
}
.login-link { text-align:center; margin-top:16px; font-size:0.8125rem; color:#64748b; }
.login-link a { color:#94a3b8; }

/* ---- Responsive ---- */
@media (max-width:768px) {
    .sidebar { transform:translateX(-100%); }
    .sidebar.mobile-open { transform:translateX(0); }
    .main { margin-left:0 !important; }
    .topbar { padding:0 12px; }
    .content { padding:12px; }
    .stat-grid { grid-template-columns:1fr 1fr; }
}
@media (max-width:480px) {
    .stat-grid { grid-template-columns:1fr; }
    .page-title { flex-direction:column; align-items:flex-start; }
}