:root {
    --primary-color: #000000;
    --accent-color: #d71920;
    --bg-color: #f4f4f5;
    --card-bg: #ffffff;
    --text-main: #333;
    --text-dim: #999;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "PingFang TC", "Microsoft JhengHei", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

header {
    padding: 60px 20px;
    text-align: center;
    width: min(900px, 100%);
    box-sizing: border-box;
}

header h1 {
    font-size: 2.5rem;
    margin: 0;
    letter-spacing: 2px;
    border-bottom: 4px solid var(--primary-color);
    display: inline-block;
    padding-bottom: 10px;
}

header p {
    margin-top: 15px;
    color: var(--text-dim);
    font-size: 1.1rem;
}

.language-switcher {
    display: inline-flex;
    position: fixed;
    top: 18px;
    right: 18px;
    z-index: 10;
    border: 2px solid var(--primary-color);
    background: var(--card-bg);
    box-shadow: 3px 3px 0 var(--primary-color);
}

.language-option {
    appearance: none;
    border: 0;
    border-right: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    cursor: pointer;
    font: inherit;
    font-size: 0.85rem;
    font-weight: 700;
    min-width: 54px;
    padding: 8px 12px;
    position: relative;
}

.language-option:last-child {
    border-right: 0;
}

.language-option.is-active {
    background: var(--primary-color);
    color: #fff;
}

.language-option.is-active::after {
    content: "";
    position: absolute;
    right: 6px;
    top: 6px;
    width: 6px;
    height: 6px;
    background: var(--accent-color);
}

.language-option:focus-visible {
    outline: 3px solid var(--accent-color);
    outline-offset: 3px;
}

.container {
    max-width: 900px;
    width: 100%;
    padding: 20px;
    box-sizing: border-box;
    flex-grow: 1;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.tool-card {
    background: var(--card-bg);
    border: 2px solid var(--primary-color);
    padding: 25px;
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
    position: relative;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.tool-card:hover {
    transform: translate(-4px, -4px);
    box-shadow: 4px 4px 0 var(--primary-color);
}

.tool-card h3 {
    margin: 0 0 10px 0;
    font-size: 1.4rem;
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: start;
    gap: 3px 10px;
}

.tool-card h3::before {
    content: "";
    width: 0.72em;
    height: 0.72em;
    margin-top: 0.32em;
    display: inline-block;
    background: var(--accent-color);
    color: var(--accent-color);
    grid-row: 1 / span 2;
}

.tool-card p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: #666;
    margin-bottom: 20px;
    flex-grow: 1;
}

[data-lang] {
    display: block;
}

[data-lang="en"] {
    color: #666;
}

h3 [data-lang="en"] {
    color: #777;
    font-size: 0.78em;
    font-weight: 700;
}

html[data-language-mode="en"] h3 [data-lang="en"] {
    color: inherit;
    font-size: 1em;
}

html[data-language-mode="en"] .tool-card h3 {
    align-items: center;
}

html[data-language-mode="en"] .tool-card h3::before {
    margin-top: 0;
}

html[data-language-mode="zh"] [data-lang="en"],
html[data-language-mode="en"] [data-lang="zh"] {
    display: none;
}

html[data-language-mode="zh"] .tool-card h3::before,
html[data-language-mode="en"] .tool-card h3::before {
    grid-row: 1;
}

html[data-language-mode="en"] body {
    font-family: Arial, Helvetica, sans-serif;
}

html[data-language-mode="en"] header p {
    font-size: 1rem;
}

.status {
    font-size: 0.8rem;
    font-weight: bold;
    text-transform: uppercase;
    padding: 4px 8px;
    border: 1px solid var(--primary-color);
    align-self: flex-start;
}

.status.online {
    background: #000;
    color: #fff;
}

.status.dev {
    background: #eee;
    color: #999;
    border-color: #ddd;
}

.tool-card.disabled {
    cursor: default;
}

.tool-card.disabled:hover {
    transform: none;
    box-shadow: none;
}

.tool-card.placeholder:hover {
    transform: none;
    box-shadow: none;
}

.tool-card.placeholder {
    border-style: dashed;
    border-color: #ccc;
    background: transparent;
}

.tool-card.placeholder h3,
.tool-card.placeholder p {
    color: #ccc;
}

@media (max-width: 600px) {
    .language-switcher {
        top: 12px;
        right: 12px;
    }

    .language-option {
        min-width: 50px;
        padding: 7px 10px;
    }

    header {
        padding-top: 72px;
    }

    header h1 {
        font-size: 1.8rem;
    }

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