:root {
    --primary-color: #0056b3;
    --primary-hover: #004494;
    --secondary-color: #545b62;
    --success-color: #1e7e34;
    --danger-color: #bd2130;
    --warning-color: #d39e00;
    --light-bg: #f8f9fa;
    --dark-text: #212529;
    --border-color: #dee2e6;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f4f6f8;
    color: var(--dark-text);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.content {
    padding: 2rem 0;
    min-height: 80vh;
}

/* Navigation */
.main-nav {
    background-color: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    padding: 1rem 0;
}

.main-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 1.5rem;
}

.main-nav a {
    text-decoration: none;
    color: var(--dark-text);
    font-weight: 500;
}

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

/* Footer */
.main-footer {
    background-color: white;
    padding: 1rem 0;
    text-align: center;
    color: var(--secondary-color);
    border-top: 1px solid var(--border-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    text-decoration: none;
    cursor: pointer;
    border: none;
    font-size: 1rem;
    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(--secondary-color);
    color: white;
}

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

.btn.icon {
    padding: 0.25rem 0.5rem;
    background-color: #e9ecef;
    color: var(--dark-text);
}

.btn.icon:hover {
    background-color: #dde2e6;
}

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

/* Forms */
.standard-form, .auth-container {
    max-width: 500px;
    margin: 0 auto;
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.form-group {
    margin-bottom: 1rem;
}

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

.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.alert.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Dashboard */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    text-align: center;
}

/* Todos */
.todo-list {
    margin-top: 2rem;
}

.todo-item {
    background: white;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.todo-item.completed {
    opacity: 0.6;
    background-color: #f8f9fa;
}

.todo-item.completed h3 {
    text-decoration: line-through;
}

.todo-header {
    display: flex;
    align-items: baseline;
    gap: 1rem;
}

.todo-header h3 {
    margin: 0;
    font-size: 1.2rem;
}

.due-date {
    font-size: 0.9rem;
    color: var(--secondary-color);
}

.due-date.overdue {
    color: var(--danger-color);
    font-weight: bold;
}

.tags {
    margin-top: 0.5rem;
}

.tag {
    background: #e9ecef;
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    font-size: 0.8rem;
    margin-right: 0.5rem;
    color: var(--secondary-color);
}

.todo-actions {
    display: flex;
    gap: 0.5rem;
}

/* Notes */
.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.note-card {
    background: white;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
}

.note-header {
    padding: 1rem;
    background-color: #fff;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.note-header h3 {
    margin: 0;
    font-size: 1.1rem;
}

.category-badge {
    background-color: #e8f0fe;
    color: #1a237e;
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

.note-body {
    padding: 1rem;
    flex-grow: 1;
    white-space: pre-wrap;
    font-size: 0.95rem;
}

.note-footer {
    padding: 0.75rem 1rem;
    background-color: #f8f9fa;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--secondary-color);
}

.header-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.welcome-banner {
    text-align: center;
    padding: 4rem 1rem;
    background: white;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}
/* Filters */
.filter-bar {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

.filter-form {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

.filter-group {
    flex: 1;
    min-width: 150px;
}

.filter-group input,
.filter-group select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.9rem;
}

.filter-group:last-child {
    flex: 0 0 auto;
    display: flex;
    gap: 0.5rem;
}
/* Dashboard Stats */
.stats-container {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin: 1.5rem 0;
    padding: 1rem 0;
    background-color: var(--light-bg);
    border-radius: 8px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--secondary-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
/* Tables (Category List) */
.category-container {
    max-width: 600px;
    margin-top: 2rem;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    text-align: left;
    padding: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.data-table th.text-right {
    text-align: right;
}

.data-table td {
    padding: 0.75rem 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.data-table td.text-right {
    text-align: right;
}

.margin-top-2 {
    margin-top: 2rem;
}

.text-center {
    text-align: center;
}