/* ============================================================
   GLOBAL
   ============================================================ */
:root {
    --sidebar-width: 260px;
    --topbar-height: 60px;
    --sidebar-bg: #1a1f2e;
    --sidebar-hover: #2a3147;
    --sidebar-active: #3d52a0;
    --sidebar-text: #a8b2d8;
    --sidebar-text-active: #ffffff;
    --accent: #3d52a0;
    --accent-light: #7091e6;
    --body-bg: #f0f2f8;
    --card-bg: #ffffff;
    --topbar-bg: #ffffff;
    --text-primary: #1a1f2e;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,.08), 0 4px 6px rgba(0,0,0,.05);
    --radius: 10px;
    --radius-sm: 6px;
}

*, *::before, *::after { box-sizing: border-box; }

body {
    background-color: var(--body-bg);
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    color: var(--text-primary);
    margin: 0;
    padding: 0;
}

/* ============================================================
   SIDEBAR
   ============================================================ */
.admin-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: transform .3s ease;
    overflow-y: auto;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255,255,255,.07);
    text-decoration: none;
    min-height: var(--topbar-height);
}

.sidebar-brand-icon {
    width: 36px;
    height: 36px;
    background: var(--accent-light);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.sidebar-brand-text {
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    letter-spacing: .3px;
    line-height: 1.2;
}

.sidebar-brand-sub {
    font-size: 11px;
    color: var(--sidebar-text);
    font-weight: 400;
}

.sidebar-nav {
    padding: 16px 12px;
    flex: 1;
    list-style: none;
    margin: 0;
}

.sidebar-section-label {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: rgba(168,178,216,.45);
    padding: 12px 12px 6px;
    margin-top: 8px;
}

.sidebar-nav .nav-item { margin-bottom: 2px; }

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    color: var(--sidebar-text);
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: background .2s, color .2s;
}

.sidebar-nav .nav-link:hover {
    background: var(--sidebar-hover);
    color: #fff;
}

.sidebar-nav .nav-link.active {
    background: var(--sidebar-active);
    color: var(--sidebar-text-active);
    box-shadow: 0 2px 8px rgba(61,82,160,.4);
}

.sidebar-nav .nav-link .nav-icon {
    font-size: 16px;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.sidebar-footer {
    padding: 16px 12px;
    border-top: 1px solid rgba(255,255,255,.07);
}

.sidebar-footer .nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    color: #f87171;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: background .2s;
}

.sidebar-footer .nav-link:hover { background: rgba(239,68,68,.15); }

/* ============================================================
   MAIN WRAPPER
   ============================================================ */
.admin-wrapper {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================================
   TOPBAR
   ============================================================ */
.admin-topbar {
    position: sticky;
    top: 0;
    height: var(--topbar-height);
    background: var(--topbar-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    z-index: 900;
    box-shadow: var(--shadow-sm);
}

.topbar-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-muted);
}

.topbar-avatar {
    width: 34px;
    height: 34px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 13px;
    font-weight: 700;
}

/* ============================================================
   PAGE CONTENT
   ============================================================ */
.admin-content {
    padding: 28px;
    flex: 1;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.page-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.page-subtitle {
    font-size: 13px;
    color: var(--text-muted);
    margin: 2px 0 0;
}

/* ============================================================
   STAT CARDS
   ============================================================ */
.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 22px 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 18px;
    transition: box-shadow .2s, transform .2s;
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.stat-icon.blue   { background: rgba(61,82,160,.12); color: var(--accent); }
.stat-icon.green  { background: rgba(16,185,129,.12); color: var(--success); }
.stat-icon.orange { background: rgba(245,158,11,.12); color: var(--warning); }
.stat-icon.red    { background: rgba(239,68,68,.12);  color: var(--danger); }

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ============================================================
   CARDS
   ============================================================ */
.card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    background: var(--card-bg);
}

.card-header {
    background: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 16px 20px;
    font-weight: 600;
    font-size: 15px;
}

.card-body { padding: 20px; }

/* ============================================================
   TABLES
   ============================================================ */
.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.admin-table thead th {
    background: #f8f9fc;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .6px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.admin-table tbody td {
    padding: 13px 16px;
    border-bottom: 1px solid #f3f4f6;
    vertical-align: middle;
    color: var(--text-primary);
}

.admin-table tbody tr:last-child td { border-bottom: none; }

.admin-table tbody tr:hover td { background: #f8f9fc; }

/* ============================================================
   BADGES
   ============================================================ */
.badge-status {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.badge-status::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
}

.badge-signed   { background: rgba(16,185,129,.12); color: #059669; }
.badge-pending  { background: rgba(245,158,11,.12);  color: #d97706; }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    padding: 7px 14px;
    transition: all .2s;
    border: 1px solid transparent;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.btn-primary:hover { background: #2e3f7f; border-color: #2e3f7f; color: #fff; }

.btn-secondary {
    background: #fff;
    color: var(--text-primary);
    border-color: var(--border-color);
}
.btn-secondary:hover { background: #f3f4f6; color: var(--text-primary); }

.btn-success { background: var(--success); color: #fff; border-color: var(--success); }
.btn-success:hover { background: #059669; border-color: #059669; color: #fff; }

.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { background: #dc2626; border-color: #dc2626; color: #fff; }

.btn-outline-danger {
    background: transparent;
    color: var(--danger);
    border-color: var(--danger);
}
.btn-outline-danger:hover { background: var(--danger); color: #fff; }

.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-lg { padding: 11px 22px; font-size: 15px; }

/* ============================================================
   FLASH MESSAGES
   ============================================================ */
.flash-container {
    padding: 0 28px;
    margin-top: 16px;
}

.flash-container .alert {
    border-radius: var(--radius);
    border: none;
    font-size: 14px;
    box-shadow: var(--shadow-sm);
}

/* ============================================================
   LOGIN PAGE
   ============================================================ */
.login-page {
    min-height: 100vh;
    background: linear-gradient(135deg, #1a1f2e 0%, #2a3147 50%, #3d52a0 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-card {
    background: #fff;
    border-radius: 16px;
    padding: 44px 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 25px 50px rgba(0,0,0,.25);
}

.login-logo {
    width: 56px;
    height: 56px;
    background: var(--accent);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin: 0 auto 20px;
}

.login-title {
    font-size: 22px;
    font-weight: 700;
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.login-subtitle {
    font-size: 14px;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 28px;
}

.login-card .form-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.login-card .form-control {
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    padding: 10px 14px;
    font-size: 14px;
    transition: border-color .2s, box-shadow .2s;
}

.login-card .form-control:focus {
    border-color: var(--accent-light);
    box-shadow: 0 0 0 3px rgba(112,145,230,.2);
    outline: none;
}

.login-btn {
    width: 100%;
    padding: 12px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background .2s, transform .1s;
    margin-top: 8px;
}

.login-btn:hover { background: #2e3f7f; }
.login-btn:active { transform: scale(.99); }

/* ============================================================
   DANGER ZONE
   ============================================================ */
.danger-zone {
    border: 1px solid #fecaca;
    border-radius: var(--radius);
    background: #fff5f5;
}

.danger-zone .card-header {
    background: #fef2f2;
    border-bottom-color: #fecaca;
    color: var(--danger);
}

/* ============================================================
   FORM STYLES
   ============================================================ */
.form-control, .form-select {
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    padding: 9px 13px;
    font-size: 14px;
    transition: border-color .2s, box-shadow .2s;
}

.form-control:focus, .form-select:focus {
    border-color: var(--accent-light);
    box-shadow: 0 0 0 3px rgba(112,145,230,.2);
    outline: none;
}

.form-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
    .admin-sidebar { transform: translateX(-100%); }
    .admin-sidebar.open { transform: translateX(0); }
    .admin-wrapper { margin-left: 0; }
    .admin-content { padding: 16px; }
    .stat-card { padding: 16px; }
}