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

html {
    scroll-behavior: auto;
}

body {
    font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
    background: #1E1E1E;
    color: #D4D4D4;
    line-height: 1.65;
}

.titlebar {
    background: #323232;
    border-bottom: 1px solid #3C3C3C;
}

.titlebar-inner {
    max-width: 1040px;
    margin: 0 auto;
    padding: 10px 18px;
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

.dots {
    display: inline-flex;
    gap: 6px;
}

.dots i {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #555;
    display: block;
}

.dots i:nth-child(1) { background: #E06C75; }
.dots i:nth-child(2) { background: #E5C07B; }
.dots i:nth-child(3) { background: #3DDC84; }

.brand {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #D4D4D4;
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
}

.brand svg {
    color: #3DDC84;
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 14px;
    margin-left: auto;
}

nav a {
    color: #A8A8A8;
    text-decoration: none;
    font-size: 13px;
}

nav a:hover,
nav a:focus {
    color: #3DDC84;
}

.shell {
    max-width: 1040px;
    margin: 0 auto;
    padding: 0 18px;
}

.hero {
    background: #1E1E1E;
    padding: 40px 0 28px;
    border-bottom: 1px solid #2A2A2A;
}

.hero h1 {
    font-family: Consolas, "Microsoft YaHei", monospace;
    font-size: 28px;
    line-height: 1.4;
    color: #3DDC84;
    margin-bottom: 14px;
    font-weight: 600;
}

.hero p {
    margin-bottom: 10px;
    font-size: 15px;
    max-width: 820px;
}

.block {
    padding: 32px 0;
}

.block h2 {
    font-size: 21px;
    color: #3DDC84;
    margin-bottom: 12px;
}

.block > .shell > p {
    margin-bottom: 12px;
    font-size: 15px;
}

.kbd-table {
    width: 100%;
    border-collapse: collapse;
    background: #2A2A2A;
    border-radius: 6px;
    overflow: hidden;
    margin-top: 14px;
}

.kbd-table th,
.kbd-table td {
    border: 1px solid #3C3C3C;
    padding: 10px 12px;
    text-align: left;
    font-size: 14px;
    vertical-align: top;
}

.kbd-table thead th {
    background: #252526;
    color: #3DDC84;
}

kbd {
    display: inline-block;
    background: #1E1E1E;
    border: 1px solid #3DDC84;
    color: #3DDC84;
    border-radius: 6px;
    padding: 2px 8px;
    font-family: Consolas, "Microsoft YaHei", monospace;
    font-size: 13px;
}

.grid-2x2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 14px;
}

.card {
    background: #2A2A2A;
    border-radius: 6px;
    padding: 16px;
    border: 1px solid #3C3C3C;
}

.card svg {
    color: #3DDC84;
    margin-bottom: 8px;
}

.card h3 {
    font-size: 16px;
    margin-bottom: 8px;
    color: #E6E6E6;
}

.card p {
    font-size: 14px;
    margin-bottom: 8px;
}

.term {
    list-style: none;
    margin-top: 12px;
}

.term li {
    background: #2A2A2A;
    border-radius: 6px;
    padding: 12px 14px;
    margin-bottom: 10px;
    border-left: 3px solid #3DDC84;
}

.term .prompt {
    display: block;
    font-family: Consolas, "Microsoft YaHei", monospace;
    color: #3DDC84;
    margin-bottom: 6px;
    font-size: 14px;
}

.term p {
    font-size: 14px;
}

.faq details {
    background: #2A2A2A;
    border-radius: 6px;
    margin-bottom: 8px;
    border: 1px solid #3C3C3C;
}

.faq summary {
    cursor: pointer;
    padding: 12px 14px;
    font-weight: 700;
    color: #E6E6E6;
}

.faq details p {
    padding: 0 14px 12px;
    font-size: 14px;
}

.foot {
    background: #141414;
    color: #8A8A8A;
    padding: 16px 18px;
    text-align: left;
}

.foot p {
    max-width: 1040px;
    margin: 0 auto;
    font-size: 12px;
}

@media (max-width: 800px) {
    .grid-2x2 {
        grid-template-columns: 1fr;
    }

    nav {
        margin-left: 0;
    }
}