/* ============================================================
   ChopUp - Stylesheet
   ============================================================ */

:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --success: #16a34a;
    --success-light: #f0fdf4;
    --warning: #d97706;
    --warning-light: #fffbeb;
    --danger: #dc2626;
    --danger-light: #fef2f2;
    --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;
    --sidebar-width: 240px;
    --header-height: 56px;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
    --shadow-md: 0 4px 6px rgba(0,0,0,.06), 0 2px 4px rgba(0,0,0,.04);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    font-size: 14px;
    color: var(--gray-800);
    background: var(--gray-50);
    line-height: 1.5;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============================================================
   LOGIN
   ============================================================ */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}
.login-card {
    background: #fff;
    border-radius: 12px;
    padding: 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 60px rgba(0,0,0,.2);
}
.login-logo {
    text-align: center;
    margin-bottom: 32px;
}
.login-logo h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}
.login-logo p {
    color: var(--gray-500);
    font-size: 14px;
}

/* ============================================================
   LAYOUT - Sidebar + Content
   ============================================================ */
.app-layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--gray-900);
    color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 100;
    display: flex;
    flex-direction: column;
}
.sidebar-header {
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255,255,255,.08);
}
.sidebar-header h1 {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
}
.sidebar-header small {
    color: var(--gray-400);
    font-size: 11px;
}
.sidebar-nav {
    flex: 1;
    padding: 12px 0;
}
.nav-section {
    padding: 0 12px;
    margin-bottom: 8px;
}
.nav-section-title {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--gray-500);
    padding: 8px 12px 4px;
}
.nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 6px;
    color: var(--gray-300);
    font-size: 13px;
    font-weight: 500;
    transition: all .15s;
    text-decoration: none;
}
.nav-link:hover {
    background: rgba(255,255,255,.06);
    color: #fff;
    text-decoration: none;
}
.nav-link.active {
    background: var(--primary);
    color: #fff;
}
.nav-link svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}
.sidebar-footer {
    padding: 12px 20px;
    border-top: 1px solid rgba(255,255,255,.08);
}
.sidebar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--gray-300);
    font-size: 13px;
}
.sidebar-user .avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 13px;
    color: #fff;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}
.content-header {
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    padding: 16px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 50;
}
.content-header h1 {
    font-size: 18px;
    font-weight: 600;
}
.content-body {
    padding: 24px 32px;
}

/* ============================================================
   COMPONENTS
   ============================================================ */

/* Cards */
.card {
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow);
}
.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.card-header h2, .card-header h3 {
    font-size: 15px;
    font-weight: 600;
}
.card-body { padding: 20px; }

/* Stat Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}
.stat-card {
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
    padding: 20px;
    box-shadow: var(--shadow);
}
.stat-card .stat-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: .04em;
    margin-bottom: 8px;
}
.stat-card .stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.2;
}
.stat-card .stat-sub {
    font-size: 12px;
    color: var(--gray-500);
    margin-top: 4px;
}
.stat-card.stat-success .stat-value { color: var(--success); }
.stat-card.stat-warning .stat-value { color: var(--warning); }
.stat-card.stat-danger .stat-value { color: var(--danger); }

/* Forms */
.form-group {
    margin-bottom: 16px;
}
.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 4px;
}
.form-control {
    width: 100%;
    padding: 8px 12px;
    font-size: 14px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    background: #fff;
    color: var(--gray-800);
    transition: border-color .15s, box-shadow .15s;
}
.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .1);
}
select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 8px center;
    background-repeat: no-repeat;
    background-size: 20px;
    padding-right: 36px;
}
textarea.form-control { resize: vertical; min-height: 80px; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    border-radius: 6px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all .15s;
    text-decoration: none;
    line-height: 1.4;
}
.btn:hover { text-decoration: none; }
.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-success {
    background: var(--success);
    color: #fff;
}
.btn-danger {
    background: var(--danger);
    color: #fff;
}
.btn-outline {
    background: #fff;
    color: var(--gray-700);
    border-color: var(--gray-300);
}
.btn-outline:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
}
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-lg { padding: 10px 20px; font-size: 15px; }
.btn-block { width: 100%; justify-content: center; }

/* Tables */
.table-wrapper { overflow-x: auto; }
table.table {
    width: 100%;
    border-collapse: collapse;
}
table.table th {
    text-align: left;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .04em;
    color: var(--gray-500);
    padding: 10px 16px;
    border-bottom: 2px solid var(--gray-200);
    white-space: nowrap;
}
table.table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-100);
    font-size: 13px;
}
table.table tbody tr:hover { background: var(--gray-50); }

/* Status Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    font-size: 11px;
    font-weight: 600;
    border-radius: 99px;
}
.badge-draft { background: var(--gray-100); color: var(--gray-600); }
.badge-final { background: var(--primary-light); color: var(--primary); }
.badge-paid { background: var(--success-light); color: var(--success); }
.badge-overdue { background: var(--danger-light); color: var(--danger); }
.badge-cancelled { background: var(--gray-100); color: var(--gray-500); }

/* Alerts / Flash */
.alert {
    padding: 12px 16px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.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; }
.alert-warning { background: var(--warning-light); color: var(--warning); border: 1px solid #fde68a; }
.alert-info { background: var(--primary-light); color: var(--primary); border: 1px solid #bfdbfe; }

/* Empty State */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--gray-500);
}
.empty-state svg { width: 48px; height: 48px; margin-bottom: 12px; opacity: .4; }
.empty-state p { margin-top: 8px; }

/* Utility */
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-muted { color: var(--gray-500); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.font-mono { font-family: 'SF Mono', 'Fira Code', monospace; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.flex { display: flex; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
    .sidebar { display: none; }
    .main-content { margin-left: 0; }
    .content-body { padding: 16px; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
}