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

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #111111;
    background-color: #ffffff;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 48px 24px;
}

.nav-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    margin-bottom: 64px;
    padding-bottom: 16px;
    border-bottom: 1px solid #eaeaea;
}

.nav-bar a {
    color: #555555;
    text-decoration: none;
    font-size: 15px;
    font-weight: 400;
    padding-bottom: 16px;
    transition: color 0.2s ease;
}

.nav-bar a:hover {
    color: #111111;
}

.nav-bar a.active {
    color: #111111;
    border-bottom: 2px solid #000000;
}

.tool-title {
    font-size: 2rem;
    font-weight: 500;
    color: #111111;
    margin-bottom: 16px;
}

.tool-desc {
    font-size: 1rem;
    color: #555555;
    margin-bottom: 48px;
    line-height: 1.6;
}

.input-group {
    margin-bottom: 28px;
}

.input-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #111111;
    margin-bottom: 10px;
}

.input-group input[type="text"],
.input-group input[type="url"],
.input-group input[type="number"],
.input-group input[type="file"],
.input-group textarea,
.input-group select {
    width: 100%;
    padding: 14px 18px;
    font-size: 15px;
    font-family: inherit;
    border: 1px solid #eaeaea;
    background-color: #ffffff;
    color: #111111;
    outline: none;
    border-radius: 12px;
    transition: border-color 0.2s ease;
}

.input-group input:focus,
.input-group textarea:focus,
.input-group select:focus {
    border-color: #111111;
}

.input-group textarea {
    min-height: 140px;
    resize: vertical;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 15px;
    font-weight: 400;
    font-family: inherit;
    color: #111111;
    background-color: #ffffff;
    border: 1px solid #eaeaea;
    cursor: pointer;
    outline: none;
    border-radius: 30px;
    transition: all 0.2s ease;
}

.btn:hover {
    border-color: #111111;
    color: #111111;
}

.btn-primary {
    color: #ffffff;
    background-color: #009DFF;
    border-color: #009DFF;
}

.btn-primary:hover {
    background-color: #0086e0;
    border-color: #0086e0;
}

.result-area {
    margin-top: 32px;
    padding: 24px;
    border: 1px solid #eaeaea;
    background-color: #ffffff;
    border-radius: 24px;
    min-height: 120px;
}

.result-area pre {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 14px;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: #111111;
    line-height: 1.6;
}

.range-container {
    display: flex;
    align-items: center;
    gap: 24px;
}

.range-container input[type="range"] {
    flex: 1;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(to right, #009DFF 0%, #009DFF 50%, #eaeaea 50%, #eaeaea 100%);
    outline: none;
    border-radius: 4px;
    cursor: pointer;
}

.range-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: #ffffff;
    border: 3px solid #009DFF;
    cursor: pointer;
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0, 157, 255, 0.2);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.range-container input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 157, 255, 0.3);
}

.range-container input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: #ffffff;
    border: 3px solid #009DFF;
    cursor: pointer;
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0, 157, 255, 0.2);
}

.range-value {
    font-size: 16px;
    font-weight: 600;
    color: #009DFF;
    min-width: 56px;
    text-align: center;
    padding: 8px 16px;
    background: #f0f8ff;
    border-radius: 10px;
    border: 1px solid #e0f0ff;
}

.image-preview {
    max-width: 100%;
    max-height: 300px;
    margin-top: 20px;
    border-radius: 12px;
}

.color-display {
    width: 100%;
    height: 120px;
    border: 1px solid #eaeaea;
    margin-top: 20px;
    border-radius: 12px;
}

.color-values {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-top: 20px;
}

.color-value-item {
    padding: 16px;
    border: 1px solid #eaeaea;
    border-radius: 12px;
}

.color-value-item label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    color: #555555;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.color-value-item input {
    width: 100%;
    padding: 10px 12px;
    font-size: 14px;
    font-family: 'SF Mono', 'Fira Code', monospace;
    border: 1px solid #eaeaea;
    background-color: #ffffff;
    color: #111111;
    outline: none;
    border-radius: 8px;
    transition: border-color 0.2s ease;
}

.color-value-item input:focus {
    border-color: #111111;
}

.qr-result {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.qr-result canvas,
.qr-result img {
    max-width: 256px;
    max-height: 256px;
    border-radius: 12px;
}

.recommend-section {
    margin-top: 64px;
    padding-top: 32px;
    border-top: 1px solid #eaeaea;
}

.recommend-section h3 {
    font-size: 14px;
    font-weight: 500;
    color: #555555;
    margin-bottom: 16px;
}

.recommend-links {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
}

.recommend-links a {
    color: #555555;
    text-decoration: underline;
    font-size: 14px;
    transition: color 0.2s ease;
}

.recommend-links a:hover {
    color: #111111;
}

footer {
    margin-top: 64px;
    padding-top: 24px;
    border-top: 1px solid #eaeaea;
    font-size: 14px;
    color: #555555;
}

footer a {
    color: #555555;
    text-decoration: none;
    transition: color 0.2s ease;
}

footer a:hover {
    color: #111111;
}

.about-content,
.privacy-content {
    line-height: 1.8;
}

.about-content h2,
.privacy-content h2 {
    font-size: 1.25rem;
    font-weight: 500;
    color: #111111;
    margin: 40px 0 20px;
}

.about-content p,
.privacy-content p {
    font-size: 15px;
    color: #555555;
    margin-bottom: 20px;
}

.about-content ul,
.privacy-content ul {
    margin: 20px 0;
    padding-left: 24px;
}

.about-content li,
.privacy-content li {
    font-size: 15px;
    color: #555555;
    margin-bottom: 12px;
}

.highlight-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 48px;
}

.highlight-card {
    display: block;
    padding: 24px;
    background: #f9f9f9;
    border-radius: 16px;
    text-decoration: none;
    transition: transform 0.2s ease;
}

.highlight-card:hover {
    transform: translateY(-2px);
}

.highlight-card .card-icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.highlight-card .card-title {
    font-size: 16px;
    font-weight: 500;
    color: #111111;
    margin-bottom: 8px;
}

.highlight-card .card-desc {
    font-size: 14px;
    color: #555555;
    line-height: 1.5;
}

.usage-stats {
    text-align: center;
    margin-bottom: 48px;
    font-size: 14px;
    color: #999999;
}

.scene-list {
    margin-bottom: 48px;
}

.scene-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background: #f9f9f9;
    border-radius: 12px;
    margin-bottom: 12px;
}

.scene-item .scene-text {
    font-size: 15px;
    color: #555555;
}

.scene-item .scene-link {
    color: #009DFF;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
    margin-left: 16px;
}

.scene-item .scene-link:hover {
    text-decoration: underline;
}

.user-reviews {
    position: relative;
    height: 120px;
    overflow: hidden;
    margin-bottom: 48px;
}

.review-bubble {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px 24px;
    background: #f9f9f9;
    border-radius: 12px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.review-bubble.active {
    opacity: 1;
    transform: translateY(0);
}

.review-bubble .review-text {
    font-size: 15px;
    color: #555555;
    font-style: italic;
    margin-bottom: 8px;
}

.review-bubble .review-author {
    font-size: 13px;
    color: #999999;
}

.daily-tip {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: #f0f8ff;
    border-radius: 12px;
    margin-bottom: 48px;
}

.daily-tip .tip-icon {
    font-size: 20px;
    flex-shrink: 0;
}

.daily-tip .tip-text {
    font-size: 14px;
    color: #555555;
    line-height: 1.5;
}

.category-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 32px;
}

.category-tab {
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 400;
    color: #555555;
    background: #ffffff;
    border: 1px solid #eaeaea;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.category-tab:hover {
    color: #111111;
    border-color: #111111;
}

.category-tab.active {
    color: #ffffff;
    background: #009DFF;
    border-color: #009DFF;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 48px;
}

.tool-card-link {
    display: block;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 12px;
    text-decoration: none;
    transition: transform 0.2s ease;
}

.tool-card-link:hover {
    transform: translateY(-2px);
}

.tool-card-link .tool-card-name {
    font-size: 15px;
    font-weight: 500;
    color: #111111;
    margin-bottom: 6px;
}

.tool-card-link .tool-card-desc {
    font-size: 13px;
    color: #555555;
    line-height: 1.4;
}

@media (max-width: 640px) {
    .container {
        padding: 32px 20px;
    }

    .nav-bar {
        gap: 20px;
        margin-bottom: 48px;
    }

    .tool-title {
        font-size: 1.75rem;
    }

    .tool-desc {
        margin-bottom: 32px;
    }

    .highlight-cards {
        grid-template-columns: 1fr;
    }

    .scene-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .scene-item .scene-link {
        margin-left: 0;
    }
}