:root {
    --color-primary: #0d9488;
    --color-primary-hover: #0f766e;
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-text: #1f2937;
    --color-text-secondary: #6b7280;
    --radius: 12px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

[data-theme="dark"] {
    --color-bg: #111827;
    --color-surface: #1f2937;
    --color-border: #374151;
    --color-text: #f9fafb;
    --color-text-secondary: #9ca3af;
}

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

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

a {
    text-decoration: none;
    color: inherit;
}

.home-page {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem 1.5rem;
    text-align: center;
}

.home-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.home-logo-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    transition: opacity 0.15s;
}

.home-logo-link:hover {
    opacity: 0.85;
}

.home-logo-mark,
.home-logo-img {
    display: block;
    width: 72px;
    height: 72px;
    object-fit: contain;
}

.home-logo-name {
    font-size: 1.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.home-logo-tagline {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.home-tools {
    width: 100%;
    max-width: 360px;
}

.home-tools-heading {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.75rem;
}

.home-tools-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.home-tool-link {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 1rem 1.125rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.home-tool-link:hover {
    border-color: var(--color-primary);
    box-shadow: 0 2px 12px rgba(13, 148, 136, 0.1);
}

.home-tool-icon {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: rgba(13, 148, 136, 0.08);
    color: var(--color-primary);
}

.home-tool-body {
    flex: 1;
    min-width: 0;
    text-align: left;
}

.home-tool-name {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
}

.home-tool-desc {
    display: block;
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    margin-top: 0.125rem;
}

.home-tool-arrow {
    flex-shrink: 0;
    color: var(--color-text-secondary);
    transition: transform 0.15s, color 0.15s;
}

.home-tool-link:hover .home-tool-arrow {
    color: var(--color-primary);
    transform: translateX(2px);
}

.home-footer {
    padding: 1.5rem;
    text-align: center;
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.theme-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s;
}

.theme-toggle:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.theme-toggle .icon-moon {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
    display: block;
}