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

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --background: #0f0f23;
    --surface: rgba(255, 255, 255, 0.1);
    --surface-hover: rgba(255, 255, 255, 0.15);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --border: rgba(255, 255, 255, 0.2);
    --success: #4ade80;
    --warning: #fbbf24;
    --error: #f87171;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    padding-bottom: 80px;
}

.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-header h1 {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(45deg, var(--accent-color), #ffffff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.btn-icon {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    padding: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: var(--surface-hover);
    transform: translateY(-2px);
}

.app-main {
    padding: 1rem;
    max-width: 100%;
}

.content-section {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.content-section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.editor-container,
.preview-container,
.templates-container,
.help-container {
    background: var(--surface);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.editor-toolbar,
.preview-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.format-select {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    min-width: 140px;
}

.format-select:hover,
.format-select:focus {
    background: var(--surface-hover);
    outline: none;
    border-color: var(--accent-color);
}

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

.btn-action {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    white-space: nowrap;
}

.btn-action:hover {
    background: var(--surface-hover);
    transform: translateY(-2px);
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
    border: none;
    border-radius: 12px;
    color: white;
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
}

.btn-secondary:hover {
    background: var(--surface-hover);
}

.case-options {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.case-options button {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.75rem;
}

.case-options button:hover {
    background: var(--surface-hover);
    transform: scale(1.05);
}

.editor-input {
    position: relative;
}

#textInput {
    width: 100%;
    min-height: 300px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    padding: 1rem;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    resize: vertical;
    transition: var(--transition);
}

#textInput:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(240, 147, 251, 0.1);
}

#textInput::placeholder {
    color: var(--text-secondary);
}

.input-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.75rem;
    padding: 0.5rem 0;
    font-size: 0.75rem;
    color: var(--text-secondary);
    flex-wrap: wrap;
    gap: 1rem;
}

.preview-output {
    min-height: 300px;
}

.preview-content {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    min-height: 300px;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.templates-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.templates-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
}

.templates-list {
    display: grid;
    gap: 1rem;
}

.template-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    transition: var(--transition);
    cursor: pointer;
}

.template-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.template-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.template-name {
    font-weight: 600;
    font-size: 1rem;
}

.template-actions {
    display: flex;
    gap: 0.25rem;
}

.template-actions button {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.25rem;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 4px;
}

.template-actions button:hover {
    color: var(--text-primary);
    background: var(--surface);
}

.template-preview {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.template-date {
    font-size: 0.625rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.empty-state small {
    font-size: 0.875rem;
}

.faq-container {
    display: grid;
    gap: 1rem;
}

.faq-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
}

.faq-question {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    padding: 1rem;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
}

.faq-question:hover {
    background: rgba(255, 255, 255, 0.05);
}

.faq-icon {
    font-size: 1.25rem;
    transition: var(--transition);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1rem 1rem 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    animation: slideDown 0.3s ease-out;
}

.faq-answer p {
    margin: 0;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-content {
    background: var(--surface);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlide 0.3s ease-out;
}

@keyframes modalSlide {
    from {
        opacity: 0;
        transform: translateY(-50px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
}

.modal-body {
    padding: 1.5rem;
    display: grid;
    gap: 1rem;
}

.modal-body input,
.modal-body textarea {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    padding: 0.75rem;
    font-size: 0.875rem;
    transition: var(--transition);
}

.modal-body input:focus,
.modal-body textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(240, 147, 251, 0.1);
}

.modal-body textarea {
    min-height: 120px;
    font-family: 'Courier New', monospace;
    resize: vertical;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    padding: 1.5rem;
    border-top: 1px solid var(--border);
}

.notification {
    position: fixed;
    top: 1rem;
    right: 1rem;
    background: var(--success);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    z-index: 1001;
    animation: notificationSlide 0.3s ease-out;
}

@keyframes notificationSlide {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

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

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-around;
    padding: 0.75rem 0;
    z-index: 100;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem;
    border-radius: 12px;
    transition: var(--transition);
    min-width: 60px;
}

.nav-item i {
    font-size: 1.25rem;
}

.nav-item span {
    font-size: 0.625rem;
    font-weight: 600;
}

.nav-item:hover,
.nav-item.active {
    color: var(--accent-color);
    background: rgba(240, 147, 251, 0.1);
    transform: translateY(-2px);
}

footer {
    text-align: center;
    padding: 2rem 1rem 1rem;
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin-top: 2rem;
}

@media (min-width: 768px) {
    .app-main {
        max-width: 1200px;
        margin: 0 auto;
        padding: 2rem;
    }
    
    .app-header {
        padding: 1.5rem 2rem;
    }
    
    .app-header h1 {
        font-size: 1.5rem;
    }
    
    .editor-container,
    .preview-container,
    .templates-container,
    .help-container {
        padding: 2rem;
    }
    
    #textInput,
    .preview-content {
        min-height: 400px;
    }
    
    .templates-list {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
    
    .bottom-nav {
        display: none;
    }
    
    .content-section {
        display: block;
    }
    
    .content-section:not(:first-child) {
        margin-top: 2rem;
    }
}

@media (min-width: 1024px) {
    .editor-toolbar,
    .preview-toolbar {
        flex-wrap: nowrap;
    }
    
    .toolbar-actions {
        flex-wrap: nowrap;
    }
    
    .input-stats {
        flex-wrap: nowrap;
    }
    
    .templates-header {
        flex-wrap: nowrap;
    }
}

.syntax-highlight {
    font-family: 'Courier New', monospace;
}

.syntax-highlight .keyword {
    color: #ff79c6;
}

.syntax-highlight .string {
    color: #f1fa8c;
}

.syntax-highlight .comment {
    color: #6272a4;
    font-style: italic;
}

.syntax-highlight .tag {
    color: #8be9fd;
}

.syntax-highlight .attribute {
    color: #50fa7b;
}

.processing {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

.processing::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid var(--accent-color);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

.file-drop-zone {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
    transition: var(--transition);
    margin-bottom: 1rem;
}

.file-drop-zone.drag-over {
    border-color: var(--accent-color);
    background: rgba(240, 147, 251, 0.1);
    color: var(--accent-color);
}

@media (max-width: 480px) {
    .app-header h1 {
        font-size: 1rem;
    }
    
    .editor-toolbar,
    .preview-toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .toolbar-actions {
        justify-content: center;
    }
    
    .case-options {
        justify-content: center;
    }
    
    .input-stats {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 0.5rem;
    }
    
    .templates-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .modal-content {
        margin: 1rem;
        max-height: calc(100vh - 2rem);
    }
    
    .modal-footer {
        flex-direction: column;
    }
}