:root {
    --color-primary: #0d9488;
    --color-primary-light: #ccfbf1;
    --color-primary-hover: #0f766e;
    --color-bg: #f5f5f5;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-text: #1f2937;
    --color-text-secondary: #6b7280;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --radius: 12px;
    --radius-sm: 8px;
    --header-brand-height: 38px;
    --header-main-height: 72px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    --color-brand-bar-bg: #eef7f6;
    --color-brand-accent: #0d9488;
}

[data-theme="dark"] {
    --color-bg: #111827;
    --color-surface: #1f2937;
    --color-border: #374151;
    --color-text: #f9fafb;
    --color-text-secondary: #9ca3af;
    --color-brand-bar-bg: #0f172a;
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
}

body.letools-tool-page {
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

body.letools-tool-page a {
    text-decoration: none;
    color: inherit;
}

.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.header-brand {
    height: var(--header-brand-height);
    background: var(--color-brand-bar-bg);
    border-bottom: 1px solid var(--color-border);
}

.header-brand-inner,
.header-main-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
}

.header-brand-inner {
    justify-content: space-between;
    gap: 12px;
}

.header-brand-start {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
    flex: 1;
}

.header-main-inner {
    justify-content: center;
}

.brand-home {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--color-brand-accent);
    font-weight: 600;
    font-size: 13px;
    flex-shrink: 0;
}

.brand-home:hover {
    opacity: 0.85;
}

.brand-mark {
    display: flex;
}

.brand-tagline {
    font-size: 12px;
    color: var(--color-text-secondary);
    flex-shrink: 0;
}

.header-main {
    height: var(--header-main-height);
    background: var(--color-surface);
}

.tool-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.tool-logo-icon {
    color: var(--color-primary);
    display: flex;
    font-size: 1.75rem;
}

.tool-logo-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    text-align: center;
}

.tool-logo-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.2;
}

.tool-logo-desc {
    font-size: 13px;
    color: var(--color-text-secondary);
}

.header-actions {
    display: flex;
    align-items: center;
}

.icon-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
}

.icon-btn:hover {
    background: var(--color-surface);
    color: var(--color-primary);
}

.site-main {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 32px 24px 48px;
}

.tool-page-intro {
    margin-bottom: 24px;
}

.tool-page-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 18px;
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
}

.tool-page-meta a {
    color: var(--color-brand-accent);
}

.tool-page-summary {
    font-size: 14px;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}

.tool-function-container {
    margin-bottom: 24px;
}

.tool-related-section {
    margin-top: 40px;
    padding-top: 28px;
    border-top: 1px solid var(--color-border);
}

.tool-related-title {
    font-size: 18px;
    font-weight: 700;
    margin: 0 0 16px;
}

.tool-related-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.tool-related-grid .archive-tool-card {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    min-height: 100%;
}

.tool-related-grid .archive-tool-card:hover {
    color: inherit;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
}

.tool-related-grid .archive-tool-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    flex-shrink: 0;
}

.tool-related-grid .archive-tool-body {
    flex: 1;
    min-width: 0;
}

.tool-related-grid .archive-tool-title {
    display: block;
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--color-text);
}

.tool-related-grid .archive-tool-desc {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-size: 0.8rem;
    line-height: 1.55;
    color: var(--color-text-secondary);
}

.tool-related-grid .archive-tool-action {
    align-self: center;
    color: var(--color-primary);
    font-size: 1rem;
    opacity: 0.7;
    flex-shrink: 0;
}

.tool-related-grid .archive-tool-card:hover .archive-tool-action {
    opacity: 1;
}

.site-footer {
    --footer-bg: #1e293b;
    --footer-text: #f1f5f9;
    --footer-text-muted: #94a3b8;
    --footer-border: #334155;
    --footer-card-bg: #273449;
    background: var(--footer-bg);
    color: var(--footer-text);
    margin-top: auto;
}

.footer-wrap {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px 24px;
}

.footer-main {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 40px;
}

.footer-about {
    flex: 1;
    min-width: 0;
}

.footer-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--footer-text);
}

.footer-desc {
    font-size: 14px;
    color: var(--footer-text-muted);
    line-height: 1.8;
    max-width: 560px;
}

.footer-qrcodes {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    flex-shrink: 0;
}

.footer-qrcode-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.footer-qrcode-box {
    width: 108px;
    height: 108px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--footer-card-bg);
    border: 1px solid var(--footer-border);
}

.footer-qrcode-box img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.footer-qrcode-box.is-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    border-style: dashed;
    background: rgba(255, 255, 255, 0.03);
}

.footer-qrcode-placeholder {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--footer-text-muted);
    opacity: 0.7;
}

.footer-qrcode-label {
    font-size: 12px;
    color: var(--footer-text-muted);
    text-align: center;
    white-space: nowrap;
}

.footer-bottom {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--footer-border);
    text-align: center;
}

.footer-copyright {
    font-size: 12px;
    color: var(--footer-text-muted);
}

.footer-copyright a {
    color: var(--footer-text-muted);
}

@media (max-width: 768px) {
    .header-brand-inner,
    .header-main-inner,
    .site-main,
    .footer-wrap {
        padding-left: 16px;
        padding-right: 16px;
    }

    .site-main {
        padding-top: 24px;
        padding-bottom: 32px;
    }

    .footer-main {
        flex-direction: column;
        gap: 28px;
    }

    .footer-qrcodes {
        align-self: flex-start;
    }

    .tool-related-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 991.98px) and (min-width: 769px) {
    .tool-related-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}