/* TimelySheets Design System
 * Brand Colors:
 * - Trust Blue (Primary): #2C7BE5
 * - Warm Yellow (Accent): #F6C85F
 * - Charcoal (Text): #0F1724
 * - Background: #F8FAFF
 * - Success: #34A853
 */

:root {
    --color-primary: #2C7BE5;
    --color-primary-dark: #1a5bb8;
    --color-primary-light: #5a9beb;
    --color-accent: #F6C85F;
    --color-accent-dark: #e0b03d;
    --color-success: #34A853;
    --color-success-light: #e8f5ec;
    --color-warning: #F59E0B;
    --color-warning-light: #fef3c7;
    --color-error: #DC2626;
    --color-error-light: #fee2e2;
    --color-text: #0F1724;
    --color-text-muted: #64748b;
    --color-bg: #F8FAFF;
    --color-bg-card: #ffffff;
    --color-border: #e2e8f0;

    --radius: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px rgba(15, 23, 36, 0.05);
    --shadow: 0 4px 6px -1px rgba(15, 23, 36, 0.1), 0 2px 4px -1px rgba(15, 23, 36, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(15, 23, 36, 0.1), 0 4px 6px -2px rgba(15, 23, 36, 0.05);

    --transition: all 0.2s ease;
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 0.5em;
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.5rem;
}

h3 {
    font-size: 1.25rem;
}

h4 {
    font-size: 1.125rem;
}

p {
    margin-bottom: 1em;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-primary-dark);
}

/* Navigation */
.navbar {
    background: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
}

.nav-brand:hover {
    color: var(--color-primary);
}

.nav-logo {
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    gap: 0.5rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    color: var(--color-text-muted);
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover {
    background: var(--color-bg);
    color: var(--color-primary);
}

.nav-link.active {
    background: rgba(44, 123, 229, 0.1);
    color: var(--color-primary);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-username {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Flash Messages */
.flash-messages {
    margin-bottom: 1.5rem;
}

.flash {
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
    margin-bottom: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.flash-success {
    background: var(--color-success-light);
    color: #166534;
    border-left: 4px solid var(--color-success);
}

.flash-error {
    background: var(--color-error-light);
    color: #991b1b;
    border-left: 4px solid var(--color-error);
}

.flash-warning {
    background: var(--color-warning-light);
    color: #92400e;
    border-left: 4px solid var(--color-warning);
}

.flash-info {
    background: rgba(44, 123, 229, 0.1);
    color: var(--color-primary-dark);
    border-left: 4px solid var(--color-primary);
}

.flash-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0.5;
    transition: var(--transition);
}

.flash-close:hover {
    opacity: 1;
}

/* Cards */
.card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--color-primary);
    color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    color: #ffffff;
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: var(--color-text);
    color: #ffffff;
}

.btn-secondary:hover:not(:disabled) {
    background: #1e293b;
    color: #ffffff;
}

.btn-success {
    background: var(--color-success);
    color: #ffffff;
}

.btn-success:hover:not(:disabled) {
    background: #2d9249;
    color: #ffffff;
}

.btn-warning {
    background: var(--color-accent);
    color: var(--color-text);
}

.btn-warning:hover:not(:disabled) {
    background: var(--color-accent-dark);
}

.btn-danger {
    background: var(--color-error);
    color: #ffffff;
}

.btn-danger:hover:not(:disabled) {
    background: #b91c1c;
    color: #ffffff;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

.btn-outline:hover:not(:disabled) {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(44, 123, 229, 0.05);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.375rem;
    color: var(--color-text);
}

.form-label-required::after {
    content: " *";
    color: var(--color-error);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-bg-card);
    transition: var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(44, 123, 229, 0.15);
}

.form-input:disabled,
.form-select:disabled {
    background: var(--color-bg);
    cursor: not-allowed;
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.form-hint {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

/* Tables */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

th,
td {
    padding: 0.75rem 1rem;
    text-align: left;
    vertical-align: middle;
}

thead tr {
    border-bottom: 2px solid var(--color-border);
}

tbody tr {
    border-bottom: 1px solid var(--color-border);
}

tbody tr:last-child {
    border-bottom: none;
}

th {
    background: var(--color-bg);
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

tbody tr:hover {
    background: rgba(44, 123, 229, 0.02);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.badge-draft {
    background: var(--color-bg);
    color: var(--color-text-muted);
}

.badge-submitted {
    background: rgba(44, 123, 229, 0.1);
    color: var(--color-primary);
}

.badge-approved {
    background: var(--color-success-light);
    color: #166534;
}

.badge-rejected {
    background: var(--color-error-light);
    color: #991b1b;
}

.badge-payroll_ready {
    background: var(--color-accent);
    color: var(--color-text);
}

.badge-teacher {
    background: rgba(139, 92, 246, 0.1);
    color: #7c3aed;
}

.badge-sub {
    background: rgba(34, 197, 94, 0.1);
    color: #16a34a;
}

.badge-admin {
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

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

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
    color: var(--color-text-muted);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

/* Footer */
.footer {
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    padding: 1.25rem 1.5rem;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Login Page */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-bg) 0%, #e0e7ff 100%);
    padding: 2rem;
}

.login-container {
    width: 100%;
    max-width: 400px;
}

.login-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 2.5rem;
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo {
    margin-bottom: 1rem;
}

.login-title {
    font-size: 1.75rem;
    margin-bottom: 0.25rem;
}

.login-tagline {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
}

/* Signature Pad */
.signature-container {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius);
    padding: 1rem;
    background: var(--color-bg);
}

.signature-canvas {
    width: 100%;
    height: 150px;
    background: #ffffff;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    cursor: crosshair;
    touch-action: none;
}

.signature-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
    justify-content: flex-end;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-title {
    font-size: 1.75rem;
    margin: 0;
}

/* Action Buttons Group */
.actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    align-items: center;
}

/* Ensure consistent button sizing in table action cells */
td.actions .btn,
td.actions button,
td.actions form {
    display: inline-flex;
    vertical-align: middle;
}

td.actions form {
    margin: 0;
    display: inline-flex;
    vertical-align: middle;
}

td.actions .btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
    line-height: 1.2;
    vertical-align: middle;
}

td.actions a.btn {
    vertical-align: middle;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-container {
        flex-wrap: wrap;
        gap: 1rem;
    }

    .nav-links {
        order: 3;
        width: 100%;
        justify-content: center;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }
}