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

:root {
    --primary-color: #5e72e4;
    --primary-hover: #4c63d2;
    --secondary-color: #f5f7fa;
    --text-primary: #32325d;
    --text-secondary: #8898aa;
    --border-color: #e9ecef;
    --success-color: #2dce89;
    --error-color: #f5365c;
    --warning-color: #fb6340;
    --info-color: #11cdef;
    --shadow-sm: 0 0 0.5rem rgba(0, 0, 0, 0.05);
    --shadow-md: 0 0 2rem rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 0 3rem rgba(0, 0, 0, 0.1);
    --radius: 0.375rem;
    --radius-lg: 0.5rem;
}

body {
    font-family: -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;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    position: relative;
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.lang-switcher {
    margin-top: 1.5rem;
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.lang-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.875rem;
}

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

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

main {
    background: white;
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 4rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    background: var(--secondary-color);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(94, 114, 228, 0.05);
}

.upload-icon {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-text {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.upload-subtext {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.select-btn {
    padding: 0.75rem 2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s ease;
    font-weight: 500;
}

.select-btn:hover {
    background: var(--primary-hover);
}

.format-text {
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.result-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 768px) {
    .result-container {
        grid-template-columns: 1fr;
    }
}

.preview-section h2,
.output-section h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.preview-wrapper {
    background: var(--secondary-color);
    border-radius: var(--radius);
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
    margin-bottom: 1rem;
}

#previewImage {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.image-info {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.image-info span {
    background: var(--secondary-color);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius);
}

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

.format-selector {
    display: flex;
    gap: 1rem;
}

.format-selector label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
}

.format-selector input[type="radio"] {
    cursor: pointer;
}

.output-wrapper {
    position: relative;
}

#outputText {
    width: 100%;
    height: 200px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    resize: vertical;
    background: var(--secondary-color);
}

.output-stats {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.action-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.copy-btn,
.download-btn,
.reset-btn {
    flex: 1;
    padding: 0.75rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 500;
}

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

.copy-btn:hover {
    background: #26af6b;
}

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

.download-btn:hover {
    background: #0da5c8;
}

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

.reset-btn:hover {
    background: #ea5021;
}

.usage-section,
.features-section {
    margin-top: 3rem;
    padding-top: 3rem;
    border-top: 1px solid var(--border-color);
}

.usage-section h2,
.features-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--text-primary);
}

.usage-list {
    max-width: 600px;
    margin: 0 auto;
    padding-left: 1.5rem;
}

.usage-list li {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    background: var(--secondary-color);
    border-radius: var(--radius-lg);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card svg {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

footer {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

footer p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background: var(--info-color);
    color: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(100%);
    transition: all 0.3s ease;
    z-index: 1000;
    font-size: 0.875rem;
    font-weight: 500;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--error-color);
}

.toast.warning {
    background: var(--warning-color);
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    .upload-area {
        padding: 3rem 1.5rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .action-buttons {
        flex-direction: column;
    }

    .toast {
        left: 1rem;
        right: 1rem;
        bottom: 1rem;
    }
}