:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #eff6ff;
    --success: #16a34a;
    --success-light: #f0fdf4;
    --warning: #d97706;
    --warning-light: #fffbeb;
    --danger: #dc2626;
    --danger-light: #fef2f2;
    --purple: #7c3aed;
    --purple-light: #f5f3ff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--gray-100); color: var(--gray-800); font-size: 14px; line-height: 1.6; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.layout { display: flex; min-height: 100vh; }
.sidebar { width: 240px; background: var(--gray-900); color: #fff; flex-shrink: 0; position: fixed; top: 0; left: 0; height: 100vh; overflow-y: auto; z-index: 100; }
.main { margin-left: 240px; flex: 1; display: flex; flex-direction: column; min-height: 100vh; }
.topbar { background: #fff; border-bottom: 1px solid var(--gray-200); padding: 0 24px; height: 60px; display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 50; }
.content { padding: 24px; flex: 1; }

/* Sidebar */
.sidebar-logo { padding: 20px 20px 16px; border-bottom: 1px solid rgba(255,255,255,0.1); }
.sidebar-logo h2 { font-size: 16px; font-weight: 600; color: #fff; }
.sidebar-logo p { font-size: 11px; color: var(--gray-400); margin-top: 2px; }
.sidebar-nav { padding: 12px 0; }
.nav-section { padding: 8px 16px 4px; font-size: 10px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray-500); font-weight: 600; }
.nav-link { display: flex; align-items: center; gap: 10px; padding: 9px 20px; color: var(--gray-400); font-size: 13px; transition: all 0.15s; border-left: 3px solid transparent; }
.nav-link:hover { background: rgba(255,255,255,0.06); color: #fff; text-decoration: none; }
.nav-link.active { background: rgba(37,99,235,0.2); color: #fff; border-left-color: var(--primary); }
.nav-link svg { width: 16px; height: 16px; flex-shrink: 0; }

/* Topbar */
.topbar-title { font-size: 16px; font-weight: 600; color: var(--gray-800); }
.topbar-right { display: flex; align-items: center; gap: 12px; }

/* Cards */
.card { background: #fff; border-radius: var(--radius-lg); border: 1px solid var(--gray-200); padding: 20px; }
.card-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.card-title { font-size: 15px; font-weight: 600; color: var(--gray-800); }

/* Stats grid */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: #fff; border-radius: var(--radius-lg); border: 1px solid var(--gray-200); padding: 20px; }
.stat-label { font-size: 12px; color: var(--gray-500); font-weight: 500; text-transform: uppercase; letter-spacing: 0.05em; }
.stat-value { font-size: 28px; font-weight: 700; color: var(--gray-900); margin-top: 4px; }
.stat-sub { font-size: 12px; color: var(--gray-500); margin-top: 4px; }
.stat-icon { width: 36px; height: 36px; border-radius: 8px; display: flex; align-items: center; justify-content: center; margin-bottom: 10px; }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px; border-radius: var(--radius); font-size: 13px; font-weight: 500; cursor: pointer; border: 1px solid transparent; transition: all 0.15s; line-height: 1; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); text-decoration: none; color: #fff; }
.btn-secondary { background: #fff; color: var(--gray-700); border-color: var(--gray-300); }
.btn-secondary:hover { background: var(--gray-50); text-decoration: none; }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { opacity: 0.9; text-decoration: none; color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; text-decoration: none; color: #fff; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-icon { padding: 7px; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 13px; font-weight: 500; color: var(--gray-700); margin-bottom: 6px; }
.form-control { width: 100%; padding: 9px 12px; border: 1px solid var(--gray-300); border-radius: var(--radius); font-size: 13px; color: var(--gray-800); background: #fff; transition: border-color 0.15s; }
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }
textarea.form-control { resize: vertical; min-height: 90px; }
select.form-control { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 10px center; padding-right: 30px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-hint { font-size: 12px; color: var(--gray-500); margin-top: 4px; }

/* Tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th { text-align: left; padding: 10px 14px; font-size: 12px; font-weight: 600; color: var(--gray-500); text-transform: uppercase; letter-spacing: 0.05em; border-bottom: 1px solid var(--gray-200); background: var(--gray-50); }
td { padding: 12px 14px; border-bottom: 1px solid var(--gray-100); font-size: 13px; color: var(--gray-700); vertical-align: middle; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--gray-50); }

/* Badges */
.badge { display: inline-flex; align-items: center; gap: 4px; padding: 3px 8px; border-radius: 999px; font-size: 11px; font-weight: 500; }
.badge-blue { background: var(--primary-light); color: var(--primary); }
.badge-green { background: var(--success-light); color: var(--success); }
.badge-yellow { background: var(--warning-light); color: var(--warning); }
.badge-red { background: var(--danger-light); color: var(--danger); }
.badge-purple { background: var(--purple-light); color: var(--purple); }
.badge-gray { background: var(--gray-100); color: var(--gray-600); }

/* Alerts */
.alert { padding: 12px 16px; border-radius: var(--radius); font-size: 13px; margin-bottom: 16px; }
.alert-success { background: var(--success-light); color: var(--success); border: 1px solid #bbf7d0; }
.alert-danger { background: var(--danger-light); color: var(--danger); border: 1px solid #fecaca; }

/* Stars */
.stars { color: #f59e0b; letter-spacing: 2px; }

/* Timeline */
.timeline { position: relative; padding-left: 20px; }
.timeline::before { content: ''; position: absolute; left: 7px; top: 0; bottom: 0; width: 2px; background: var(--gray-200); }
.timeline-item { position: relative; margin-bottom: 20px; }
.timeline-dot { position: absolute; left: -17px; top: 4px; width: 12px; height: 12px; border-radius: 50%; background: var(--primary); border: 2px solid #fff; box-shadow: 0 0 0 2px var(--primary); }
.timeline-dot.visit { background: var(--success); box-shadow: 0 0 0 2px var(--success); }
.timeline-dot.call { background: var(--warning); box-shadow: 0 0 0 2px var(--warning); }
.timeline-dot.email { background: var(--purple); box-shadow: 0 0 0 2px var(--purple); }
.timeline-date { font-size: 11px; color: var(--gray-500); margin-bottom: 4px; }
.timeline-card { background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius); padding: 12px 14px; }
.timeline-type { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--gray-500); }
.timeline-notes { margin-top: 6px; color: var(--gray-700); font-size: 13px; }
.timeline-member { font-size: 12px; color: var(--gray-500); margin-top: 6px; }

/* Reminder highlight */
.reminder-overdue { background: var(--danger-light) !important; }
.reminder-today { background: var(--warning-light) !important; }
.reminder-upcoming { background: var(--success-light) !important; }

/* Modal */
.modal-backdrop { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 200; align-items: center; justify-content: center; }
.modal-backdrop.open { display: flex; }
.modal { background: #fff; border-radius: var(--radius-lg); width: 560px; max-width: 95vw; max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow-md); }
.modal-header { padding: 20px 24px 16px; border-bottom: 1px solid var(--gray-200); display: flex; align-items: center; justify-content: space-between; }
.modal-title { font-size: 16px; font-weight: 600; }
.modal-body { padding: 20px 24px; }
.modal-footer { padding: 16px 24px; border-top: 1px solid var(--gray-200); display: flex; gap: 10px; justify-content: flex-end; }
.modal-close { background: none; border: none; font-size: 20px; cursor: pointer; color: var(--gray-500); line-height: 1; }

/* Search */
.search-bar { display: flex; align-items: center; gap: 8px; background: var(--gray-100); border: 1px solid var(--gray-200); border-radius: var(--radius); padding: 7px 12px; width: 280px; }
.search-bar input { background: none; border: none; outline: none; font-size: 13px; color: var(--gray-800); flex: 1; }

/* Page header */
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.page-title { font-size: 20px; font-weight: 700; color: var(--gray-900); }
.page-sub { font-size: 13px; color: var(--gray-500); margin-top: 2px; }

/* Avatar */
.avatar { width: 32px; height: 32px; border-radius: 50%; background: var(--primary); color: #fff; display: inline-flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 600; flex-shrink: 0; }

/* Rating stars input */
.star-rating { display: flex; gap: 4px; flex-direction: row-reverse; justify-content: flex-end; }
.star-rating input { display: none; }
.star-rating label { font-size: 24px; color: var(--gray-300); cursor: pointer; }
.star-rating input:checked ~ label, .star-rating label:hover, .star-rating label:hover ~ label { color: #f59e0b; }

/* Empty state */
.empty-state { text-align: center; padding: 48px 20px; color: var(--gray-500); }
.empty-state svg { width: 48px; height: 48px; margin: 0 auto 12px; opacity: 0.3; display: block; }
.empty-state p { font-size: 15px; margin-bottom: 4px; color: var(--gray-700); }
.empty-state small { font-size: 13px; }

/* Tabs */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--gray-200); margin-bottom: 20px; }
.tab { padding: 10px 16px; font-size: 13px; font-weight: 500; color: var(--gray-500); cursor: pointer; border-bottom: 2px solid transparent; transition: all 0.15s; }
.tab:hover { color: var(--gray-800); }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }

/* Utility */
.flex { display: flex; }
.items-center { align-items: center; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.text-sm { font-size: 12px; }
.text-gray { color: var(--gray-500); }
.font-medium { font-weight: 500; }
.font-bold { font-weight: 700; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .main { margin-left: 0; }
    .form-row { grid-template-columns: 1fr; }
    .grid-2 { grid-template-columns: 1fr; }
}