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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #edf5ff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent-primary: #0f4ba5;
    --accent-hover: #1177bb;
    --accent-danger: #c75450;
    --accent-success: #4ec9b0;
    --border-color: #e2e8f0;
    --input-bg: #3c3c3c;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-success));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.main-panel {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 30px;
}

/* Input Section */
.input-section {
    margin-bottom: 30px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.section-header label {
    font-weight: 500;
    color: var(--text-primary);
}

.input-stats,
.output-stats {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.input-textarea,
.output-textarea {
    width: 100%;
    padding: 15px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 16px;
    resize: vertical;
    outline: none;
    transition: border-color 0.3s;
}

.input-textarea:focus {
    border-color: var(--accent-primary);
}

.input-textarea::placeholder {
    color: var(--text-secondary);
}

.input-actions {
    display: flex;
    gap: 10px;
    margin-top: 12px;
}

/* Options Section */
.options-section {
    margin-bottom: 30px;
}

.options-section h3 {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.option-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
}

.option-title {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--text-primary);
}

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

.radio-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.radio-label input[type="radio"] {
    accent-color: var(--accent-primary);
}

/* Toggle Switch */
.toggle-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.toggle-label input {
    display: none;
}

.toggle-slider {
    position: relative;
    width: 44px;
    height: 24px;
    background: var(--bg-primary);
    border-radius: 12px;
    transition: background 0.3s;
    border: 1px solid var(--border-color);
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: var(--text-secondary);
    border-radius: 50%;
    transition: transform 0.3s;
}

.toggle-label input:checked + .toggle-slider {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.toggle-label input:checked + .toggle-slider::after {
    transform: translateX(20px);
    background: white;
}

.toggle-text {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.option-hint {
    margin-top: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Checkbox */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.checkbox-label:last-child {
    margin-bottom: 0;
}

.checkbox-label input[type="checkbox"] {
    accent-color: var(--accent-primary);
}

.number-input {
    width: 60px;
    padding: 4px 8px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 0.9rem;
    text-align: center;
}

.number-input:focus {
    border-color: var(--accent-primary);
    outline: none;
}

/* Output Section */
.output-section {
    margin-bottom: 30px;
}

.output-wrapper {
    position: relative;
}

.output-textarea {
    background: var(--bg-tertiary);
    padding-right: 50px;
}

.btn-copy {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 36px;
    height: 36px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.btn-copy:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.btn-copy svg {
    width: 18px;
    height: 18px;
}

.output-preview {
    margin-top: 12px;
    padding: 10px 15px;
    background: var(--bg-primary);
    border-radius: 6px;
    font-size: 0.9rem;
}

.preview-label {
    color: var(--text-secondary);
}

.preview-url {
    color: var(--accent-primary);
    word-break: break-all;
}

.output-actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

/* Buttons */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-primary);
    border-color: var(--accent-primary);
}

.btn-sm {
    padding: 6px 16px;
    font-size: 0.85rem;
}

.icon {
    width: 18px;
    height: 18px;
}

/* History Section */
.history-section {
    border-top: 1px solid var(--border-color);
    padding-top: 25px;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.history-header h3 {
    font-size: 1rem;
    font-weight: 500;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.history-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 15px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.history-item:hover {
    border-color: var(--accent-primary);
    background: var(--bg-primary);
}

.history-slug {
    flex: 1;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-date {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.history-actions {
    display: flex;
    gap: 5px;
}

.history-btn {
    padding: 5px 10px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.history-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.empty-history {
    text-align: center;
    padding: 30px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-color);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--accent-success);
    color: var(--bg-primary);
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 500;
    opacity: 0;
    transition: all 0.3s;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    header h1 {
        font-size: 1.8rem;
    }

    .main-panel {
        padding: 20px;
    }

    .options-grid {
        grid-template-columns: 1fr;
    }

    .output-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}