/* 炫酷深色主题 */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a2e;
    --bg-card-hover: #252542;
    --accent-primary: #00f5ff;
    --accent-secondary: #ff00ff;
    --accent-tertiary: #7b2cff;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6a6a7a;
    --border-color: #2a2a4a;
    --gradient-1: linear-gradient(135deg, #00f5ff 0%, #7b2cff 100%);
    --gradient-2: linear-gradient(135deg, #ff00ff 0%, #00f5ff 100%);
    --glow-cyan: 0 0 20px rgba(0, 245, 255, 0.5);
    --glow-pink: 0 0 20px rgba(255, 0, 255, 0.5);
}

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

body {
    font-family: 'Rajdhani', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    background-image:
        radial-gradient(ellipse at top, rgba(123, 44, 255, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at bottom right, rgba(0, 245, 255, 0.1) 0%, transparent 50%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    text-align: center;
    padding: 40px 0;
}

.title {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: var(--glow-cyan);
    letter-spacing: 2px;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: 10px;
    letter-spacing: 3px;
    text-transform: uppercase;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* Upload Section */
.upload-section {
    display: flex;
    justify-content: center;
}

.upload-area {
    width: 100%;
    max-width: 600px;
    padding: 60px 40px;
    border: 2px dashed var(--border-color);
    border-radius: 20px;
    background: var(--bg-card);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 245, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.upload-area:hover::before {
    left: 100%;
}

.upload-area:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--glow-cyan);
    transform: translateY(-5px);
}

.upload-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    color: var(--accent-primary);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.upload-text {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.upload-hint {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Preview Section */
.preview-section {
    display: none;
}

.preview-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

.preview-box {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 20px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.preview-box:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--glow-cyan);
}

.preview-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    color: var(--accent-primary);
    margin-bottom: 15px;
    text-align: center;
    letter-spacing: 2px;
}

.preview-image-wrapper {
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    overflow: hidden;
    background: var(--bg-secondary);
}

.preview-image-wrapper img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.result-wrapper {
    position: relative;
}

/* Checkerboard for transparent background */
.checkerboard {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(45deg, #2a2a3a 25%, transparent 25%),
        linear-gradient(-45deg, #2a2a3a 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #2a2a3a 75%),
        linear-gradient(-45deg, transparent 75%, #2a2a3a 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    z-index: 0;
}

.result-wrapper img {
    position: relative;
    z-index: 1;
}

/* Loading Spinner */
.loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 2;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

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

.loading-spinner p {
    color: var(--accent-primary);
    font-size: 1rem;
    letter-spacing: 2px;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    font-family: 'Rajdhani', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.btn svg {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: var(--gradient-1);
    color: var(--bg-primary);
    box-shadow: var(--glow-cyan);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 30px rgba(0, 245, 255, 0.7);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--gradient-2);
    color: var(--bg-primary);
    box-shadow: var(--glow-pink);
}

.btn-secondary:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 0 30px rgba(255, 0, 255, 0.7);
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
}

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

.btn-small {
    padding: 10px 20px;
    font-size: 0.9rem;
    background: var(--gradient-1);
    color: var(--bg-primary);
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-small:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-cyan);
}

/* Settings Section */
.settings-section {
    background: var(--bg-card);
    border-radius: 15px;
    padding: 25px;
    border: 1px solid var(--border-color);
    max-width: 500px;
    margin: 0 auto;
    width: 100%;
}

.settings-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    color: var(--accent-primary);
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.input-group input {
    width: 100%;
    padding: 12px 15px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-family: 'Rajdhani', sans-serif;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 10px rgba(0, 245, 255, 0.3);
}

.input-group input::placeholder {
    color: var(--text-muted);
}

.settings-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 10px;
}

/* Footer */
.footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-muted);
}

.footer a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer a:hover {
    text-shadow: var(--glow-cyan);
}

/* Responsive */
@media (max-width: 768px) {
    .title {
        font-size: 1.8rem;
    }

    .preview-container {
        grid-template-columns: 1fr;
    }

    .action-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
}