/* ====== VARIABLES ====== */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --success: #16a34a;
    --success-light: #dcfce7;
    --warning: #d97706;
    --warning-light: #fef3c7;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --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;
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
}

/* ====== RESET & BASE ====== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--gray-800);
    background: var(--gray-50);
    line-height: 1.6;
    min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ====== LAYOUT ====== */
.app-container { display: flex; flex-direction: column; min-height: 100vh; }

/* Header / Navbar */
.navbar {
    background: var(--gray-900);
    color: white;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}
.navbar-brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: white;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.navbar-brand svg { width: 24px; height: 24px; }
.navbar-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.navbar-user-name {
    font-size: 0.875rem;
    color: var(--gray-300);
}
.navbar-role {
    font-size: 0.7rem;
    background: var(--primary);
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    text-transform: uppercase;
    font-weight: 600;
}

/* Main content */
.main-content {
    flex: 1;
    padding: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* ====== CARDS ====== */
.card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    overflow: hidden;
}
.card-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
}
.card-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-800);
}
.card-body { padding: 1.5rem; }

/* ====== BUTTONS ====== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
    font-family: inherit;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #15803d; }
.btn-warning { background: var(--warning); color: white; }
.btn-warning:hover { background: #b45309; }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #b91c1c; }
.btn-outline {
    background: white;
    color: var(--gray-700);
    border-color: var(--gray-300);
}
.btn-outline:hover { background: var(--gray-50); border-color: var(--gray-400); }
.btn-logout {
    background: transparent;
    color: #f87171;
    border: 1px solid #f87171;
    font-weight: 500;
}
.btn-logout:hover { background: #f87171; color: white; }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }
.btn-lg { padding: 0.75rem 1.5rem; font-size: 1rem; }
.btn-block { width: 100%; }

/* ====== FORMS ====== */
.form-group { margin-bottom: 1rem; }
.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.35rem;
}
.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.9375rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    background: white;
    color: var(--gray-800);
    transition: border-color 0.15s, box-shadow 0.15s;
    font-family: inherit;
}
.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}
textarea.form-control { min-height: 80px; resize: vertical; }
select.form-control { appearance: auto; }

/* ====== TABLES ====== */
.table-responsive { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}
th {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--gray-500);
    background: var(--gray-50);
    white-space: nowrap;
}
td { font-size: 0.875rem; }
tr:hover td { background: var(--gray-50); }

/* ====== BADGES / STATUS ====== */
.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 12px;
    white-space: nowrap;
}
.badge-draft { background: var(--gray-200); color: var(--gray-700); }
.badge-pending { background: var(--warning-light); color: var(--warning); }
.badge-approved { background: var(--success-light); color: var(--success); }
.badge-rejected { background: var(--danger-light); color: var(--danger); }

/* ====== LOGIN PAGE ====== */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
    padding: 1rem;
}
.login-card {
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    padding: 2.5rem 2rem;
    width: 100%;
    max-width: 400px;
}
.login-card h1 {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
}
.login-card .subtitle {
    text-align: center;
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-bottom: 2rem;
}
.login-error {
    background: var(--danger-light);
    color: var(--danger);
    padding: 0.75rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    display: none;
}

/* ====== TABS / NAV ====== */
.tabs {
    display: flex;
    border-bottom: 2px solid var(--gray-200);
    margin-bottom: 1.5rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.tab {
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-500);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.15s;
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
    font-family: inherit;
}
.tab:hover { color: var(--gray-700); }
.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    font-weight: 600;
}

/* ====== ALERTS ====== */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}
.alert-success { background: var(--success-light); color: #166534; border: 1px solid #bbf7d0; }
.alert-danger { background: var(--danger-light); color: #991b1b; border: 1px solid #fecaca; }
.alert-warning { background: var(--warning-light); color: #92400e; border: 1px solid #fde68a; }
.alert-info { background: var(--primary-light); color: #1e40af; border: 1px solid #bfdbfe; }

/* ====== SIGNATURE BOX ====== */
.signature-box {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    border-radius: var(--radius);
    padding: 1rem;
    margin: 0.75rem 0;
}
.signature-box .sig-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--success);
    text-transform: uppercase;
    margin-bottom: 0.35rem;
}
.signature-box .sig-name { font-weight: 600; color: var(--gray-800); }
.signature-box .sig-date { font-size: 0.8rem; color: var(--gray-500); }
.signature-box .sig-fp {
    font-size: 0.7rem;
    font-family: monospace;
    color: var(--gray-400);
    word-break: break-all;
}

/* ====== TASK LIST IN REPORT ====== */
.task-item {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 1rem;
    margin-bottom: 0.75rem;
}
.task-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.task-item-header .task-num {
    font-weight: 700;
    color: var(--primary);
    min-width: 24px;
}
.task-item .task-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; }

/* ====== MODAL ====== */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: 1rem;
}
.modal {
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}
.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.modal-header h3 { font-size: 1.1rem; }
.modal-body { padding: 1.5rem; }
.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}
.modal-close {
    background: none; border: none; cursor: pointer;
    font-size: 1.5rem; color: var(--gray-400); line-height: 1;
}
.modal-close:hover { color: var(--gray-700); }

/* ====== EMPTY STATE ====== */
.empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
    color: var(--gray-400);
}
.empty-state svg { width: 48px; height: 48px; margin-bottom: 1rem; opacity: 0.5; }
.empty-state p { font-size: 0.95rem; }

/* ====== GRID HELPERS ====== */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1rem; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-gap { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.text-center { text-align: center; }
.text-muted { color: var(--gray-500); }
.text-sm { font-size: 0.875rem; }
.hidden { display: none !important; }

/* ====== STAT CARDS ====== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.stat-card {
    background: white;
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
    padding: 1.25rem;
    box-shadow: var(--shadow);
}
.stat-card .stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
}
.stat-card .stat-label {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-top: 0.25rem;
}

/* ====== RESPONSIVE ====== */
@media (max-width: 768px) {
    .navbar { padding: 0 1rem; }
    .navbar-brand { font-size: 0.95rem; }
    .navbar-user-name { display: none; }
    .main-content { padding: 1rem; }
    .card-header { padding: 0.75rem 1rem; }
    .card-body { padding: 1rem; }
    th, td { padding: 0.5rem 0.75rem; }
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .task-item .task-fields { grid-template-columns: 1fr; }
    .task-item > div[style*="grid-template-columns"] { grid-template-columns: 1fr !important; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .btn-lg { padding: 0.6rem 1.25rem; }
    .modal { max-width: 95vw; }
    .modal-header, .modal-body, .modal-footer { padding: 1rem; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    .login-card { padding: 1.5rem 1.25rem; }
    .tabs .tab { padding: 0.6rem 0.75rem; font-size: 0.8rem; }
}

/* ====== LOADING ====== */
.spinner {
    display: inline-block;
    width: 20px; height: 20px;
    border: 2px solid var(--gray-300);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ====== TOAST ====== */
.toast-container {
    position: fixed;
    top: 70px;
    right: 1rem;
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.toast {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 280px;
    max-width: 400px;
    animation: slideIn 0.3s ease;
    border-left: 4px solid var(--primary);
}
.toast.toast-success { border-left-color: var(--success); }
.toast.toast-error { border-left-color: var(--danger); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }