:root {
    --primary-color: #5e72e4;
    --secondary-color: #6c757d;
    --success-color: #2dce89;
    --danger-color: #f5365c;
    --warning-color: #fb6340;
    --info-color: #11cdef;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --white: #ffffff;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* 语言选择器样式 */
.language-selector {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 100;
}

.language-select {
    background: var(--white);
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
    min-width: 140px;
}

.language-select:hover {
    border-color: var(--primary-color);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

.language-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(94, 114, 228, 0.1);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    color: var(--white);
    animation: fadeInDown 0.8s ease;
}

.title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 30px;
    flex: 1;
    animation: fadeIn 1s ease 0.2s both;
}

.controls-panel {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    max-height: calc(100vh - 200px);
    overflow-y: auto;
}

.preview-panel {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    display: flex;
    flex-direction: column;
}

.control-group {
    margin-bottom: 25px;
}

.control-label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--gray-700);
    font-size: 0.9rem;
}

.control-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.text-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: 1rem;
    resize: vertical;
    min-height: 80px;
    transition: var(--transition);
    font-family: inherit;
}

.text-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(94, 114, 228, 0.1);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 15px;
}

.slider {
    flex: 1;
    height: 6px;
    background: var(--gray-300);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 8px rgba(94, 114, 228, 0.3);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    border: none;
}

.slider::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 8px rgba(94, 114, 228, 0.3);
}

.slider-value {
    min-width: 50px;
    text-align: center;
    font-weight: 500;
    color: var(--gray-700);
    background: var(--gray-100);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.9rem;
}

.select-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background: var(--white);
    cursor: pointer;
    transition: var(--transition);
}

.select-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(94, 114, 228, 0.1);
}

.color-input-container {
    display: flex;
    gap: 10px;
    align-items: center;
}

.color-input {
    width: 60px;
    height: 40px;
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.color-input:hover {
    border-color: var(--primary-color);
}

.color-hex {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.color-hex:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(94, 114, 228, 0.1);
}

.preset-buttons {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-300);
}

.preset-title {
    font-weight: 500;
    margin-bottom: 15px;
    color: var(--gray-700);
    font-size: 0.9rem;
}

.preset-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.preset-btn {
    padding: 10px 16px;
    border: none;
    border-radius: var(--border-radius);
    background: var(--gray-100);
    color: var(--gray-700);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.preset-btn:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(94, 114, 228, 0.3);
}

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

.preview-title {
    font-weight: 600;
    color: var(--gray-700);
    font-size: 1.2rem;
}

.preview-actions {
    display: flex;
    gap: 10px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background: #4c63d2;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(94, 114, 228, 0.3);
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-300);
    transform: translateY(-2px);
}

.preview-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    border-radius: var(--border-radius);
    padding: 40px 20px;
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
}

.arched-text-svg {
    width: 100%;
    height: 100%;
    max-width: 800px;
    max-height: 400px;
}

.export-panel {
    padding-top: 20px;
    border-top: 1px solid var(--gray-300);
}

.export-title {
    font-weight: 500;
    margin-bottom: 15px;
    color: var(--gray-700);
    font-size: 0.9rem;
}

.export-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.footer {
    text-align: center;
    margin-top: 40px;
    color: var(--white);
    opacity: 0.9;
    font-size: 0.9rem;
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 24px;
    background: var(--white);
    color: var(--gray-800);
    border-radius: var(--border-radius);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
    transform: translateX(400px);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    font-weight: 500;
}

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

.notification.success {
    border-left: 4px solid var(--success-color);
}

.notification.error {
    border-left: 4px solid var(--danger-color);
}

.notification.info {
    border-left: 4px solid var(--info-color);
}

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

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

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .controls-panel {
        max-height: none;
    }

    .title {
        font-size: 2.5rem;
    }
}

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

    .language-selector {
        position: static;
        margin-bottom: 20px;
        text-align: center;
    }

    .language-select {
        min-width: 180px;
    }

    .control-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

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

    .export-buttons {
        grid-template-columns: 1fr;
    }

    .preview-header {
        flex-direction: column;
        gap: 15px;
        align-items: stretch;
    }

    .preview-actions {
        justify-content: center;
    }

    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }

    .language-selector {
        margin-bottom: 15px;
    }

    .language-select {
        min-width: 160px;
        font-size: 0.85rem;
        padding: 6px 12px;
    }

    .controls-panel,
    .preview-panel {
        padding: 20px;
    }

    .preview-container {
        padding: 20px 10px;
    }

    .title {
        font-size: 1.8rem;
    }
}

/* 滚动条样式 */
.controls-panel::-webkit-scrollbar {
    width: 8px;
}

.controls-panel::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: 4px;
}

.controls-panel::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 4px;
}

.controls-panel::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--white);
    animation: spin 1s ease-in-out infinite;
}

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