:root {
    --bg-color: #e0e5ec;
    --primary-color: #6c63ff;
    --secondary-color: #4a4a6a;
    --text-color: #4a4a6a;
    --text-light: #7a7a9a;
    --shadow-light: #ffffff;
    --shadow-dark: #a3b1c6;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --danger-color: #f44336;
    --border-radius: 20px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 30px 20px;
}

.header {
    text-align: center;
    margin-bottom: 40px;
}

.header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

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

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 30px;
}

@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr 1fr;
    }
}

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

.panel {
    background: var(--bg-color);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: 10px 10px 20px var(--shadow-dark),
                -10px -10px 20px var(--shadow-light);
}

.panel-title {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid rgba(108, 99, 255, 0.2);
}

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

.input-label {
    display: block;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-color);
    font-size: 0.95rem;
}

.input-textarea {
    width: 100%;
    min-height: 120px;
    padding: 15px;
    border: none;
    border-radius: 15px;
    background: var(--bg-color);
    box-shadow: inset 5px 5px 10px var(--shadow-dark),
                inset -5px -5px 10px var(--shadow-light);
    color: var(--text-color);
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    transition: var(--transition);
}

.input-textarea:focus {
    outline: none;
    box-shadow: inset 5px 5px 10px var(--shadow-dark),
                inset -5px -5px 10px var(--shadow-light),
                0 0 0 3px rgba(108, 99, 255, 0.3);
}

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

.type-switch,
.style-switch {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.type-btn,
.style-btn {
    flex: 1;
    min-width: 80px;
    padding: 12px 15px;
    border: none;
    border-radius: 12px;
    background: var(--bg-color);
    box-shadow: 5px 5px 10px var(--shadow-dark),
                -5px -5px 10px var(--shadow-light);
    color: var(--text-light);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.type-btn.active,
.style-btn.active {
    box-shadow: inset 5px 5px 10px var(--shadow-dark),
                inset -5px -5px 10px var(--shadow-light);
    color: var(--primary-color);
    font-weight: 600;
}

.type-btn:hover:not(.active),
.style-btn:hover:not(.active) {
    color: var(--primary-color);
}

.slider {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--bg-color);
    box-shadow: inset 3px 3px 6px var(--shadow-dark),
                inset -3px -3px 6px var(--shadow-light);
    -webkit-appearance: none;
    appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: 3px 3px 6px var(--shadow-dark),
                -3px -3px 6px var(--shadow-light);
    transition: var(--transition);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: 3px 3px 6px var(--shadow-dark),
                -3px -3px 6px var(--shadow-light);
}

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

.color-input {
    width: 50px;
    height: 45px;
    border: none;
    border-radius: 12px;
    background: var(--bg-color);
    box-shadow: 5px 5px 10px var(--shadow-dark),
                -5px -5px 10px var(--shadow-light);
    cursor: pointer;
    padding: 5px;
}

.color-input::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-input::-webkit-color-swatch {
    border: none;
    border-radius: 8px;
}

.color-text {
    flex: 1;
    padding: 12px 15px;
    border: none;
    border-radius: 12px;
    background: var(--bg-color);
    box-shadow: inset 5px 5px 10px var(--shadow-dark),
                inset -5px -5px 10px var(--shadow-light);
    color: var(--text-color);
    font-size: 0.95rem;
    font-family: inherit;
}

.color-text:focus {
    outline: none;
}

.select-input {
    width: 100%;
    padding: 12px 15px;
    border: none;
    border-radius: 12px;
    background: var(--bg-color);
    box-shadow: 5px 5px 10px var(--shadow-dark),
                -5px -5px 10px var(--shadow-light);
    color: var(--text-color);
    font-size: 0.95rem;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
}

.select-input:focus {
    outline: none;
    box-shadow: 5px 5px 10px var(--shadow-dark),
                -5px -5px 10px var(--shadow-light),
                0 0 0 3px rgba(108, 99, 255, 0.3);
}

.background-upload {
    position: relative;
}

.upload-area {
    position: relative;
    padding: 30px;
    border: 2px dashed var(--shadow-dark);
    border-radius: 15px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-color);
    box-shadow: inset 5px 5px 10px var(--shadow-dark),
                inset -5px -5px 10px var(--shadow-light);
}

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

.upload-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.upload-area span {
    display: block;
    color: var(--text-light);
}

.upload-hint {
    font-size: 0.8rem !important;
    margin-top: 5px;
}

.file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.bg-preview {
    position: relative;
    margin-top: 15px;
}

.bg-preview img {
    width: 100%;
    max-height: 150px;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 5px 5px 10px var(--shadow-dark),
                -5px -5px 10px var(--shadow-light);
}

.remove-bg {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 30px;
    height: 30px;
    border: none;
    border-radius: 50%;
    background: var(--danger-color);
    color: white;
    cursor: pointer;
    font-size: 1rem;
    box-shadow: 3px 3px 6px var(--shadow-dark);
    transition: var(--transition);
}

.remove-bg:hover {
    transform: scale(1.1);
}

.readability-result {
    background: var(--bg-color);
    border-radius: 15px;
    padding: 20px;
    box-shadow: inset 5px 5px 10px var(--shadow-dark),
                inset -5px -5px 10px var(--shadow-light);
}

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

.score-label {
    font-weight: 600;
    color: var(--text-color);
}

.score-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.readability-tips {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.5;
}

.preview-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 350px;
    margin-bottom: 25px;
}

.qr-preview {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background: var(--bg-color);
    border-radius: var(--border-radius);
    box-shadow: inset 8px 8px 15px var(--shadow-dark),
                inset -8px -8px 15px var(--shadow-light);
    min-width: 300px;
    min-height: 300px;
}

.qr-placeholder {
    text-align: center;
    color: var(--text-light);
}

.placeholder-icon {
    font-size: 4rem;
    margin-bottom: 15px;
    opacity: 0.5;
}

.qr-placeholder span {
    display: block;
    font-size: 1rem;
}

.preview-actions {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.btn {
    flex: 1;
    min-width: 140px;
    padding: 15px 25px;
    border: none;
    border-radius: 15px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 5px 5px 10px var(--shadow-dark),
                -5px -5px 10px var(--shadow-light);
}

.btn:active {
    box-shadow: inset 5px 5px 10px var(--shadow-dark),
                inset -5px -5px 10px var(--shadow-light);
}

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

.btn-primary:hover {
    background: #5a52e0;
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    color: #5a52e0;
    transform: translateY(-2px);
}

.footer {
    text-align: center;
    margin-top: 50px;
    padding: 20px;
    color: var(--text-light);
    font-size: 0.9rem;
}

.qr-canvas-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

canvas {
    border-radius: 8px;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
    padding: 5px 10px;
    border-radius: 8px;
    background: var(--bg-color);
    box-shadow: 3px 3px 6px var(--shadow-dark),
                -3px -3px 6px var(--shadow-light);
}

a:hover {
    color: #5a52e0;
    transform: translateY(-2px);
    box-shadow: 4px 4px 8px var(--shadow-dark),
                -4px -4px 8px var(--shadow-light);
}

a:active {
    transform: translateY(0);
    box-shadow: inset 3px 3px 6px var(--shadow-dark),
                inset -3px -3px 6px var(--shadow-light);
}

.footer a {
    font-size: 0.85rem;
}

.fade-in {
    animation: fadeIn 0.3s ease;
}