:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2ecc71;
    --danger-color: #e74c3c;
    --light-gray: #f5f5f5;
    --medium-gray: #ddd;
    --dark-gray: #333;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --border-radius: 4px;
    --sidebar-width: 350px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.4;
    color: var(--dark-gray);
    background-color: #f9f9f9;
    display: flex;
    flex-direction: column;
}

.app-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

header {
    background-color: white;
    padding: 8px 12px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    z-index: 100;
    flex-shrink: 0;
}

h1 {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.4rem;
}

.subtitle {
    font-size: 0.7em;
    color: var(--dark-gray);
    font-weight: 400;
    opacity: 0.8;
}

.date-controls, .view-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.toggle-btn {
    background-color: #f0f0f0;
    border: 1px solid var(--medium-gray);
    display: flex;
    align-items: center;
    gap: 5px;
}

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

#currentDate {
    min-width: 150px;
    text-align: center;
    font-weight: 600;
}

button {
    cursor: pointer;
    border: none;
    border-radius: var(--border-radius);
    padding: 6px 12px;
    transition: all 0.2s;
    background-color: white;
}

button:hover {
    background-color: var(--light-gray);
}

.compact-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 4px 8px;
    font-size: 0.9em;
}

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

.compact-btn.secondary {
    background-color: #95a5a6;
}

.compact-btn.secondary:hover {
    background-color: #7f8c8d;
}

.compact-input {
    padding: 4px 8px;
    border: 1px solid var(--medium-gray);
    border-radius: var(--border-radius);
    font-size: 0.9em;
}

.inline-form {
    display: flex;
    gap: 6px;
    align-items: center;
}

main {
    flex: 1;
    overflow: auto;
    padding: 10px;
    display: flex;
    flex-direction: column;
    transition: margin-right 0.3s ease-in-out;
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 10px 15px;
    border-radius: var(--border-radius);
    background: #333;
    color: white;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
    z-index: 9999;
    max-width: 300px;
    transition: opacity 0.5s;
}

.notification.success {
    background-color: var(--secondary-color);
}

.notification.error {
    background-color: var(--danger-color);
}

.notification.warning {
    background-color: #f39c12;
}

.notification.fade-out {
    opacity: 0;
}

@media screen and (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-actions {
        width: 100%;
        justify-content: flex-end;
    }
    
    .date-controls, .view-controls {
        width: 100%;
        justify-content: space-between;
    }
}