:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --warning-color: #f39c12;
    --background-color: #f8f9fa;
    --card-color: #ffffff;
    --text-color: #2c3e50;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-dark {
    --primary-color: #4dabf7;
    --secondary-color: #51cf66;
    --accent-color: #ff6b6b;
    --warning-color: #ffd43b;
    --background-color: #1a1a1a;
    --card-color: #2d2d2d;
    --text-color: #e9ecef;
    --text-muted: #adb5bd;
    --border-color: #495057;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 20px;
    transition: var(--transition);
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--card-color);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.header h1 {
    color: var(--primary-color);
    font-size: 2em;
    font-weight: 700;
}

.header-controls {
    display: flex;
    gap: 10px;
}

.icon-button {
    background: none;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 8px 12px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1.2em;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 45px;
    height: 45px;
}

.icon-button:hover {
    background-color: var(--primary-color);
    color: var(--card-color);
    transform: translateY(-2px);
}

/* Clock styles */
.clock-container {
    background-color: var(--card-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 30px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.clock {
    font-size: 3em;
    font-weight: 700;
    color: var(--primary-color);
    font-variant-numeric: tabular-nums;
    letter-spacing: 2px;
}

.standard-time {
    font-size: 1.1em;
    color: var(--text-muted);
    margin-top: 10px;
    font-variant-numeric: tabular-nums;
}

.time-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width 1s ease;
    border-radius: 0 4px 0 0;
}

/* Navigation */
.navigation-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    background-color: var(--card-color);
    padding: 15px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.nav-button, .today-button {
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1em;
    transition: var(--transition);
    font-weight: 600;
}

.nav-button {
    background-color: var(--primary-color);
    color: var(--card-color);
    min-width: 50px;
}

.nav-button:hover {
    background-color: var(--accent-color);
    transform: scale(1.05);
}

.today-button {
    background-color: var(--secondary-color);
    color: var(--card-color);
    padding: 10px 30px;
}

.today-button:hover {
    background-color: var(--warning-color);
    transform: scale(1.05);
}

/* Stats container */
.stats-container {
    background-color: var(--card-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stat-label {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.9em;
}

.progress-bar {
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width 0.5s ease;
    border-radius: 4px;
}

/* Calendar improvements */
.calendar-container {
    background-color: var(--card-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.calendar {
    padding: 20px;
}

.month-name {
    font-size: 1.8em;
    text-align: center;
    margin-bottom: 20px;
    color: var(--primary-color);
    font-weight: 700;
}

.weekday-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    font-weight: 600;
    margin-bottom: 15px;
    font-size: 0.9em;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
}

.calendar-day {
    text-align: center;
    padding: 12px 8px;
    border-radius: 8px;
    border: 2px solid transparent;
    transition: var(--transition);
    cursor: pointer;
    font-weight: 500;
    position: relative;
    min-height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calendar-day:hover {
    background-color: var(--border-color);
    transform: scale(1.05);
}

.current-day {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    font-weight: 700;
    transform: scale(1.1);
    box-shadow: var(--shadow);
    border-color: var(--accent-color);
}

.current-day::after {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    z-index: -1;
    opacity: 0.3;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.1); opacity: 0.1; }
}

/* Year day improvements */
.year-day-calendar {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, var(--warning-color), var(--accent-color));
    border-radius: 15px;
    color: white;
    text-align: center;
    margin: 20px;
    position: relative;
    overflow: hidden;
}

.year-day-calendar::before {
    content: '🎊';
    position: absolute;
    font-size: 10em;
    opacity: 0.1;
    z-index: 0;
}

.year-day-title {
    font-size: 2.5em;
    font-weight: 700;
    margin-bottom: 15px;
    z-index: 1;
    position: relative;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.year-day-message {
    font-size: 1.3em;
    z-index: 1;
    position: relative;
    max-width: 400px;
    line-height: 1.5;
}

/* Yearly view */
.yearly-view {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: none;
    z-index: 1000;
    overflow: auto;
}

.yearly-content {
    background-color: var(--card-color);
    margin: 20px;
    padding: 30px;
    border-radius: var(--border-radius);
    max-width: 1200px;
    margin: 20px auto;
}

.yearly-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.yearly-month {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    background-color: var(--background-color);
}

.yearly-month-name {
    font-weight: 600;
    text-align: center;
    margin-bottom: 8px;
    color: var(--primary-color);
    font-size: 0.9em;
}

.yearly-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
    text-align: center;
    font-size: 0.7em;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.yearly-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
}

.yearly-day {
    text-align: center;
    padding: 2px;
    font-size: 0.7em;
    border-radius: 2px;
}

.yearly-day.today {
    background-color: var(--primary-color);
    color: white;
    font-weight: bold;
}

.year-day-month {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--warning-color), var(--accent-color));
    color: white;
}

.yearly-year-day {
    font-size: 2em;
    margin-top: 10px;
}

/* Settings panel */
.settings-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 500px;
    background-color: var(--card-color);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    display: none;
}

.settings-content h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.8em;
}

.setting-group {
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.setting-group label {
    font-weight: 600;
    color: var(--text-color);
}

.setting-group select,
.setting-group input[type="date"] {
    padding: 8px 12px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--background-color);
    color: var(--text-color);
    font-size: 0.9em;
}

.setting-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--primary-color);
}

.setting-actions {
    display: flex;
    gap: 10px;
    margin: 20px 0;
}

.action-button {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.action-button:not(.secondary) {
    background-color: var(--primary-color);
    color: white;
}

.action-button.secondary {
    background-color: var(--border-color);
    color: var(--text-color);
}

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

/* Info panel improvements */
.info-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 600px;
    background-color: var(--card-color);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    display: none;
    max-height: 80vh;
    overflow-y: auto;
}

.info-content {
    margin: 20px 0;
}

.info-content h3 {
    color: var(--primary-color);
    margin: 20px 0 10px 0;
    font-size: 1.2em;
}

.info-content ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.info-content li {
    margin-bottom: 5px;
}

.info-content kbd {
    background-color: var(--border-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9em;
    border: 1px solid var(--text-muted);
}

/* Notifications */
.notification-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.notification {
    padding: 12px 20px;
    border-radius: 8px;
    color: white;
    font-weight: 600;
    box-shadow: var(--shadow);
    transform: translateX(100%);
    transition: var(--transition);
    min-width: 250px;
}

.notification.show {
    transform: translateX(0);
}

.notification.info {
    background-color: var(--primary-color);
}

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

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

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

/* Responsive design */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
        padding: 10px;
    }
    
    .calendar, .clock-container {
        width: 100%;
        margin-bottom: 20px;
    }
    
    .calendar-grid {
        grid-template-columns: repeat(7, 1fr);
        gap: 5px;
    }
    
    .calendar-day {
        height: 35px;
        font-size: 14px;
    }
    
    .clock {
        width: 200px;
        height: 200px;
    }
    
    .header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .header h1 {
        font-size: 1.5em;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
    
    .yearly-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    
    .settings-panel,
    .info-panel {
        width: 95%;
        padding: 20px;
    }
    
    .navigation-container {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .nav-button, .today-button {
        min-width: auto;
        padding: 8px 16px;
    }
}

@media (max-width: 480px) {
    .calendar-day {
        height: 30px;
        font-size: 12px;
    }
    
    .clock {
        width: 150px;
        height: 150px;
    }
    
    .header-controls {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .icon-button {
        min-width: 40px;
        height: 40px;
        font-size: 1em;
    }
    
    .notification {
        min-width: 200px;
        font-size: 0.9em;
    }
}

/* Print styles */
@media print {
    .header-controls,
    .navigation-container,
    .info-section,
    .notification-container {
        display: none !important;
    }
    
    .container {
        max-width: none;
    }
    
    .clock-container,
    .calendar-container,
    .stats-container {
        box-shadow: none;
        border: 1px solid #000;
    }
}