:root {
    /* Light Mode (Blue-Green Theme) */
    --bg-gradient-start: #1E5F7A;
    --bg-gradient-end: #3A9B5C;
    --link-color: white; /* White links in light mode */
    --link-hover: #f0f0f0;
    --text-primary: #333;
    --text-secondary: #4a5568;
    --text-light: #718096;
    --bg-primary: white;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f7fafc;
    --border-color: #e2e8f0;
    --border-color-light: #cbd5e0;
    --accent-primary: #48bb78;
    --accent-secondary: #38a169;
    --accent-blue: #3182ce;
    --accent-blue-hover: #2c5aa0;
    --accent-orange: #ed8936;
    --accent-orange-hover: #dd6b20;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --shadow-light: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    /* Dark Mode */
    --bg-gradient-start: #1a202c;
    --bg-gradient-end: #2d3748;
    --link-color: #f6ad55; /* Orange in dark mode */
    --link-hover: #ed8936;
    --text-primary: #e2e8f0;
    --text-secondary: #cbd5e0;
    --text-light: #a0aec0;
    --bg-primary: #2d3748;
    --bg-secondary: #4a5568;
    --bg-tertiary: #1a202c;
    --border-color: #4a5568;
    --border-color-light: #718096;
    --accent-primary: #68d391;
    --accent-secondary: #48bb78;
    --accent-blue: #63b3ed;
    --accent-blue-hover: #4299e1;
    --accent-orange: #f6ad55;
    --accent-orange-hover: #ed8936;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --shadow-light: rgba(0, 0, 0, 0.2);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #1E5F7A 0%, #3A9B5C 50%, #3A9B5C 100%);
    min-height: 100vh;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

/* Dark mode body background */
[data-theme="dark"] body {
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    color: white;
    margin-bottom: 30px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.title-section {
    text-align: center;
    flex: 1;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.language-selector {
    display: flex;
    align-items: center;
    gap: 15px;
}

.language-selector select {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 1rem;
    cursor: pointer;
    backdrop-filter: blur(10px);
}

.language-selector select:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.7);
}

.language-selector option {
    background: var(--bg-gradient-start);
    color: white;
}

.dark-mode-toggle {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 1.2rem;
    cursor: pointer;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    min-width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dark-mode-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
}

.form-section {
    background: var(--bg-primary);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow-color);
    transition: all 0.3s ease;
}

.preview-section {
    background: var(--bg-primary);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow-color);
    position: sticky;
    top: 20px;
    transition: all 0.3s ease;
}

.form-section h2, .preview-section h2 {
    color: var(--text-secondary);
    margin-bottom: 25px;
    font-size: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

/* DateTime Section Layout */
.datetime-section {
    display: grid;
    grid-template-columns: 66% 34%;
    gap: 15px;
    margin-bottom: 20px;
}

.date-field, .time-field {
    margin-bottom: 0 !important;
}

/* Form Groups */
.form-group {
    margin-bottom: 20px;
    transition: all 0.3s ease;
    padding: 10px;
    border-radius: 8px;
    border: 2px solid transparent;
}

.form-group.mandatory {
    border-left: 4px solid #f56565;
    background-color: #fef5e5;
    padding-left: 15px;
}

/* Dark mode mandatory fields */
[data-theme="dark"] .form-group.mandatory {
    border: 2px solid #fc8181;
    border-left: 4px solid #fc8181;
    background-color: var(--bg-secondary);
    outline: 1px solid #fc8181;
    outline-offset: -1px;
}

.form-group.template-selected {
    border: 2px solid var(--accent-primary) !important;
    background-color: var(--bg-secondary);
    transform: scale(1.02);
    box-shadow: 0 4px 15px rgba(72, 187, 120, 0.3);
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Checkbox Styling */
.checkbox-label {
    display: flex !important;
    align-items: center;
    cursor: pointer;
    gap: 10px;
    padding: 5px 0;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    background: var(--border-color);
    border-radius: 4px;
    position: relative;
    transition: all 0.3s ease;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--accent-primary);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark:after {
    content: '✓';
    color: white;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: bold;
    font-size: 14px;
}

/* Advanced Fields Toggle */
.advanced-fields {
    margin: 30px 0;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.toggle-advanced {
    width: 100%;
    background: var(--bg-secondary);
    border: none;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.toggle-advanced:hover {
    background: var(--bg-tertiary);
}

.toggle-icon {
    transition: transform 0.3s ease;
    font-size: 0.8rem;
}

.toggle-advanced.expanded .toggle-icon {
    transform: rotate(90deg);
}

.advanced-content {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
    background: var(--bg-primary);
}

.advanced-content.expanded {
    max-height: 1000px;
    padding: 20px;
}

.char-count {
    font-size: 0.8rem;
    color: var(--text-light);
    font-weight: normal;
    background: var(--border-color);
    padding: 2px 8px;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(72, 187, 120, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

/* Action Buttons - Now in right column */
.action-buttons {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 2px solid #e2e8f0;
}

.main-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
}

.btn {
    padding: 14px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn.half-width {
    flex: 1;
}

.btn.full-width {
    width: 100%;
}

.btn.primary {
    background: linear-gradient(45deg, var(--accent-blue), var(--accent-blue-hover));
    color: white;
}

.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(49, 130, 206, 0.4);
}

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

.btn.secondary:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(72, 187, 120, 0.4);
}

.btn.tertiary {
    background: var(--accent-orange);
    color: white;
}

.btn.tertiary:hover {
    background: var(--accent-orange-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(237, 137, 54, 0.4);
}

/* Template Actions */
.template-actions {
    margin-top: 20px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.template-actions p {
    margin-bottom: 15px;
    color: var(--text-secondary);
    font-weight: 500;
}

.template-buttons {
    display: flex;
    gap: 10px;
}

.template-buttons .btn {
    flex: 1;
}

.hidden {
    display: none;
}

.result-section {
    margin-top: 20px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 2px solid var(--accent-primary);
    transition: all 0.3s ease;
}

.result-section h3 {
    color: var(--accent-secondary);
    margin-bottom: 15px;
}

.result-content {
    background: var(--bg-primary);
    padding: 15px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    word-break: break-all;
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.preview-content {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    min-height: 400px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.preview-placeholder {
    text-align: center;
    color: var(--text-light);
    font-style: italic;
    padding: 50px 20px;
}

.preview-event {
    background: var(--bg-primary);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 10px var(--shadow-light);
    border-left: 4px solid var(--accent-primary);
    transition: all 0.3s ease;
}

.preview-event .event-title {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.preview-event .event-time {
    color: var(--accent-primary);
    font-weight: 600;
    margin-bottom: 15px;
    font-size: 1rem;
}

.preview-event .event-details {
    color: var(--text-secondary);
    line-height: 1.6;
}

.preview-event .event-details strong {
    color: var(--text-secondary);
    min-width: 100px;
    display: inline-block;
}

.preview-event .event-description {
    background: var(--bg-tertiary);
    padding: 10px;
    border-radius: 6px;
    margin-top: 10px;
    border-left: 3px solid var(--border-color);
    font-style: italic;
    color: var(--text-primary);
}

/* Template Preview Section */
.template-preview-section {
    margin-top: 20px;
}

.template-preview-section h3 {
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-size: 1.2rem;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border-color);
}

.template-preview-content {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 15px;
    min-height: 120px;
    transition: all 0.3s ease;
}

.template-preview-placeholder {
    text-align: center;
    color: var(--text-light);
    font-style: italic;
    padding: 20px;
    font-size: 0.9rem;
}

.template-preview-url {
    background: var(--bg-primary);
    border: 1px solid var(--border-color-light);
    border-radius: 6px;
    padding: 10px;
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 0.8rem;
    word-break: break-all;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.template-preview-fields {
    margin-top: 10px;
    padding: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.template-preview-fields strong {
    color: var(--accent-primary);
}

.error-message {
    color: #e53e3e;
    font-size: 0.9rem;
    margin-top: 5px;
    padding: 8px;
    background: #fed7d7;
    border-radius: 4px;
    border-left: 3px solid #e53e3e;
}

.success-message {
    color: #2f855a;
    font-size: 0.9rem;
    margin-top: 5px;
    padding: 8px;
    background: #c6f6d5;
    border-radius: 4px;
    border-left: 3px solid #2f855a;
}

/* Links styling - Mix of gradient colors in light mode, orange in dark mode */
a {
    color: var(--link-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .preview-section {
        position: static;
    }
    
    .main-buttons {
        flex-direction: column;
        gap: 12px;
    }
    
    .btn.half-width {
        flex: none;
        width: 100%;
    }
    
    .template-buttons {
        flex-direction: column;
        gap: 12px;
    }
    
    .template-buttons .btn {
        flex: none;
        width: 100%;
    }
    
    .datetime-section {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .form-section,
    .preview-section {
        padding: 20px;
    }
    
    .datetime-section {
        grid-template-columns: 1fr;
    }
    
    .main-buttons {
        flex-direction: column;
    }
    
    .template-buttons {
        flex-direction: column;
    }
}

/* Template selection mode */
.template-mode .form-group {
    cursor: pointer;
    border: 2px dashed var(--border-color-light);
    transition: all 0.3s ease;
}

.template-mode .form-group:hover {
    border-color: var(--accent-primary);
    background-color: var(--bg-secondary);
    transform: scale(1.01);
}

.template-mode .form-group.template-selected:hover {
    border-color: var(--accent-secondary);
}

/* Animation for character counters */
.char-count.warning {
    background: #fed7aa;
    color: #c05621;
}

.char-count.danger {
    background: #fed7d7;
    color: #c53030;
}

/* All Day Event hiding time fields */
.all-day-mode #endTimeGroup {
    opacity: 0.5;
    pointer-events: none;
}

.all-day-mode #startTime,
.all-day-mode #endTime {
    background-color: var(--bg-secondary) !important;
}