:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #f3f4f6;
    --background-color: #f9fafb;
    --card-background: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --success-color: #22c55e;
    --error-color: #ef4444;
    --font-family: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-primary);
    margin: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Auth Page Layout --- */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1.5rem;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background-color: var(--card-background);
    padding: 2.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

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

.auth-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
}

.title-accent {
    color: var(--primary-color);
}

.auth-subtitle {
    margin-top: 0.5rem;
    color: var(--text-secondary);
}

/* --- App Layout (Dashboard) --- */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background-color: var(--card-background);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    transition: width 0.3s ease;
}

.sidebar-header {
    margin-bottom: 2rem;
}

.sidebar-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex-grow: 1;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: background-color 0.2s ease, color 0.2s ease;
}

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

.nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

.nav-icon {
    width: 20px;
    margin-right: 1rem;
    text-align: center;
}

.sidebar-footer {
    margin-top: 2rem;
}
.nav-link.logout:hover {
    background-color: #fee2e2;
    color: #b91c1c;
}

.main-content {
    flex-grow: 1;
    padding: 2.5rem;
    overflow-y: auto;
}

.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin: 0;
    color: var(--text-primary);
}

.page-header p {
    margin-top: 0.5rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

.page-content {
    display: none;
}
.page-content.active {
    display: block;
}

/* --- Components --- */
.card {
    background-color: var(--card-background);
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 3px 0 rgba(0,0,0,0.05);
    padding: 2rem;
}

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

.card-header h3 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    box-sizing: border-box;
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: inherit;
    font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.form-hint {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.btn {
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: background-color 0.2s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--card-background);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover {
    background-color: var(--secondary-color);
}

.btn-block {
    width: 100%;
}

.alert {
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-radius: 0.5rem;
    color: white;
    text-align: center;
    font-weight: 500;
}

.alert.error { background-color: var(--error-color); }
.alert.success { background-color: var(--success-color); }

/* --- Modal --- */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(17, 24, 39, 0.6);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--card-background);
    margin: 5% auto;
    width: 90%;
    max-width: 700px;
    border-radius: 0.75rem;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {transform: translateY(-30px); opacity: 0}
    to {transform: translateY(0); opacity: 1}
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    margin: 0;
    font-size: 1.25rem;
}

.close-button {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    background-color: #f9fafb;
    border-bottom-left-radius: 0.75rem;
    border-bottom-right-radius: 0.75rem;
}

/* --- Templates Table --- */
.templates-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1.5rem;
}
.templates-table th, .templates-table td {
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
    text-align: left;
    vertical-align: middle;
}
.templates-table th {
    background-color: #f9fafb;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.templates-table .actions {
    text-align: right;
}
.templates-table .actions .btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    margin: 0 0.5rem;
    color: var(--text-secondary);
    transition: color 0.2s;
}
.templates-table .actions .btn-icon:hover {
    color: var(--primary-color);
}
.templates-table .actions .btn-icon.delete:hover {
    color: var(--error-color);
}