/* Time Zone Converter - Enhanced Responsive Design */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --danger-color: #f56565;
    --text-primary: #2d3748;
    --text-secondary: #4a5568;
    --text-light: #718096;
    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --bg-tertiary: #edf2f7;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    font-size: 16px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 40px 30px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
}

.header h1 i {
    margin-right: 15px;
    animation: rotate 20s linear infinite;
}

.header p {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
    position: relative;
    z-index: 1;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Main Content */
.main-content {
    padding: 40px 30px;
}

/* Section Styling */
.current-time-section,
.converter-section,
.multi-timezone-section,
.meeting-planner-section,
.favorites-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.current-time-section::before,
.converter-section::before,
.multi-timezone-section::before,
.meeting-planner-section::before,
.favorites-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.current-time-section:hover,
.converter-section:hover,
.multi-timezone-section:hover,
.meeting-planner-section:hover,
.favorites-section:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Section Headers */
.current-time-section h2,
.converter-section h2,
.multi-timezone-section h2,
.meeting-planner-section h2,
.favorites-section h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.current-time-section h2 i,
.converter-section h2 i,
.multi-timezone-section h2 i,
.meeting-planner-section h2 i,
.favorites-section h2 i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* Current Time Display */
.time-display {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
}

.local-time {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 30px;
    border-radius: var(--radius-lg);
    text-align: center;
    min-width: 350px;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.local-time::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

.local-time h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    opacity: 0.9;
    font-weight: 500;
}

.time-with-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.time-value {
    font-size: 3rem;
    font-weight: 800;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: -1px;
}

.date-value {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 8px;
}

.timezone-name {
    font-size: 0.95rem;
    opacity: 0.8;
    font-weight: 300;
}

.day-night-indicator {
    font-size: 2rem;
    animation: pulse 2s infinite;
    filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.5));
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.1); }
}

/* Converter Grid */
.converter-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 30px;
    align-items: start;
    margin-bottom: 25px;
}

.converter-item {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.converter-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.converter-item label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.converter-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 40px;
}

.converter-arrow i {
    font-size: 2rem;
    color: var(--primary-color);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(0); }
    40% { transform: translateX(-5px); }
    60% { transform: translateX(5px); }
}

/* Form Elements */
.timezone-select,
.date-input,
.time-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition);
}

.timezone-select:focus,
.date-input:focus,
.time-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

.time-input-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 15px;
}

/* Result Display */
.result-display {
    margin-top: 20px;
    padding: 20px;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: var(--radius-md);
    border: 2px dashed var(--primary-color);
    text-align: center;
    min-height: 80px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.converted-time {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

/* Buttons */
.convert-btn,
.add-btn,
.plan-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.convert-btn::before,
.add-btn::before,
.plan-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.convert-btn:hover::before,
.add-btn:hover::before,
.plan-btn:hover::before {
    left: 100%;
}

.convert-btn:hover,
.add-btn:hover,
.plan-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.convert-btn:active,
.add-btn:active,
.plan-btn:active {
    transform: translateY(0);
}

.convert-btn {
    width: 100%;
    margin-top: 20px;
}

.add-btn {
    background: linear-gradient(135deg, var(--success-color), #38a169);
}

.plan-btn {
    background: linear-gradient(135deg, var(--accent-color), #f5576c);
}

/* Add Timezone Controls */
.add-timezone-controls {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
    align-items: end;
}

.add-timezone-controls .timezone-select {
    flex: 1;
}

/* World Clocks Grid */
.world-clocks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.world-clock-item {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    padding: 25px;
    border-radius: var(--radius-lg);
    text-align: center;
    position: relative;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    overflow: hidden;
}

.world-clock-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
    transform: translateX(-100%);
    transition: transform 0.6s;
}

.world-clock-item:hover::before {
    transform: translateX(100%);
}

.world-clock-item:hover {
    transform: translateY(-3px) scale(1.02);
}

.world-clock-item h4 {
    margin-bottom: 15px;
    font-size: 1.3rem;
    font-weight: 600;
}

.world-clock-time {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 10px;
}

.world-clock-time .time {
    font-size: 2rem;
    font-weight: 800;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.world-clock-date {
    font-size: 1rem;
    opacity: 0.9;
    margin-bottom: 15px;
}

.remove-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.remove-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.star-btn {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    padding: 5px;
    border-radius: 50%;
}

.star-btn:hover {
    color: #ffd700;
    transform: scale(1.2);
}

.star-btn.active {
    color: #ffd700;
    filter: drop-shadow(0 0 5px #ffd700);
}

/* Meeting Controls */
.meeting-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
}

.meeting-input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.meeting-input-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

/* Meeting Results */
.meeting-results {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 25px;
    border: 2px solid var(--border-color);
}

.meeting-results h3 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.4rem;
    text-align: center;
}

.meeting-time-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.meeting-time-item:hover {
    background: rgba(102, 126, 234, 0.05);
    margin: 0 -10px;
    padding: 15px 10px;
    border-radius: var(--radius-md);
}

.meeting-time-item:last-child {
    border-bottom: none;
}

.meeting-timezone {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.meeting-time {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Favorites */
.favorites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 15px;
}

.favorite-item {
    background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
    padding: 20px;
    border-radius: var(--radius-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid transparent;
}

.favorite-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--warning-color);
}

.favorite-name {
    font-weight: 600;
    color: #744210;
    font-size: 1.1rem;
}

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

/* Footer */
.footer {
    background: var(--bg-tertiary);
    text-align: center;
    padding: 20px;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        margin: 10px;
    }
    
    .main-content {
        padding: 30px 25px;
    }
    
    .world-clocks-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        margin: 0;
        border-radius: var(--radius-lg);
    }
    
    .header {
        padding: 30px 20px;
    }
    
    .header h1 {
        font-size: 2.2rem;
    }
    
    .main-content {
        padding: 25px 20px;
    }
    
    .current-time-section,
    .converter-section,
    .multi-timezone-section,
    .meeting-planner-section,
    .favorites-section {
        padding: 20px;
        margin-bottom: 20px;
    }
    
    .converter-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .converter-arrow {
        transform: rotate(90deg);
        margin: 10px 0;
    }
    
    .converter-arrow i {
        animation: bounceVertical 2s infinite;
    }
    
    @keyframes bounceVertical {
        0%, 20%, 50%, 80%, 100% { transform: rotate(90deg) translateX(0); }
        40% { transform: rotate(90deg) translateX(-5px); }
        60% { transform: rotate(90deg) translateX(5px); }
    }
    
    .local-time {
        min-width: auto;
        width: 100%;
    }
    
    .time-value {
        font-size: 2.5rem;
    }
    
    .meeting-controls {
        grid-template-columns: 1fr;
    }
    
    .add-timezone-controls {
        flex-direction: column;
        gap: 10px;
    }
    
    .world-clocks-grid {
        grid-template-columns: 1fr;
    }
    
    .favorites-grid {
        grid-template-columns: 1fr;
    }
    
    .meeting-time-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.8rem;
    }
    
    .header p {
        font-size: 1rem;
    }
    
    .time-value {
        font-size: 2rem;
    }
    
    .time-with-indicator {
        flex-direction: column;
        gap: 10px;
    }
    
    .day-night-indicator {
        font-size: 1.5rem;
    }
    
    .world-clock-time .time {
        font-size: 1.6rem;
    }
    
    .current-time-section h2,
    .converter-section h2,
    .multi-timezone-section h2,
    .meeting-planner-section h2,
    .favorites-section h2 {
        font-size: 1.5rem;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f7fafc;
        --text-secondary: #e2e8f0;
        --text-light: #a0aec0;
        --bg-primary: #2d3748;
        --bg-secondary: #4a5568;
        --bg-tertiary: #1a202c;
        --border-color: #4a5568;
    }
    
    body {
        background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
    }
}

/* Print styles */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .container {
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    .header {
        background: #f0f0f0 !important;
        color: black !important;
    }
    
    .world-clock-item,
    .favorite-item {
        background: #f9f9f9 !important;
        color: black !important;
    }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for better accessibility */
button:focus-visible,
select:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}