/* ===== 颜色变量：亮色主题（默认） ===== */
:root {
    --bg-body: #f5f0ed;
    --bg-app: #ffffff;
    --bg-scheme: #faf7f5;
    --text-header: #1F0010;
    --text-sub: #3A0018;
    --text-body: #2C0011;
    --text-strong: #4D0013;
    --text-muted: #7F0016;
    --border-main: #d0c8c4;
    --border-scheme: #B3001B;
    --link-color: #B3001B;
    --link-hover: #D40B2E;
    --badge-bg: #E61B3C;
    --badge-text: #ffffff;
    --id-bg: #f0e8e4;
    --id-text: #1F0010;
    --btn-bg: #ffffff;
    --btn-border: #B3001B;
    --btn-text: #B3001B;
    --btn-hover-bg: #B3001B;
    --btn-hover-border: #B3001B;
    --btn-hover-text: #ffffff;
    --copy-bg: #ffffff;
    --copy-border: #B3001B;
    --copy-text: #B3001B;
    --copy-hover-bg: #B3001B;
    --copy-hover-border: #B3001B;
    --copy-hover-text: #ffffff;
    --footer-color: #7F0016;
}

/* ===== 暗黑主题（覆盖） ===== */
.theme-dark {
    --bg-body: #1F0010;
    --bg-app: #3A0018;
    --bg-scheme: #2C0011;
    --text-header: #F06474;
    --text-sub: #E83350;
    --text-body: #F2798C;
    --text-strong: #F04256;
    --text-muted: #B3001B;
    --border-main: #4D0013;
    --border-scheme: #C40020;
    --link-color: #E61B3C;
    --link-hover: #F06474;
    --badge-bg: #B3001B;
    --badge-text: #f0d0d0;
    --id-bg: #1F0010;
    --id-text: #F2798C;
    --btn-bg: #3A0018;
    --btn-border: #7F0016;
    --btn-text: #D40B2E;
    --btn-hover-bg: #99001A;
    --btn-hover-border: #E61B3C;
    --btn-hover-text: #ffffff;
    --copy-bg: #3A0018;
    --copy-border: #7F0016;
    --copy-text: #D40B2E;
    --copy-hover-bg: #99001A;
    --copy-hover-border: #E61B3C;
    --copy-hover-text: #ffffff;
    /* 页脚颜色调亮 */
    --footer-color: #FFB0C0;
}

/* ===== 专门提亮描述文字 ===== */
.theme-dark .server-desc {
    color: #FFE8EE;  /* 极亮粉白，清晰可读 */
}

/* ===== 基础重置（不变） ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-body);
    color: var(--text-body);
    font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem 1rem;
    transition: background-color 0.3s, color 0.3s;
}

#app {
    max-width: 820px;
    width: 100%;
    background-color: var(--bg-app);
    border: 1px solid var(--border-main);
    border-radius: 12px;
    padding: 2rem 2rem 1.5rem;
    box-shadow: 0 0 30px rgba(0,0,0,0.8);
    transition: background-color 0.3s, border-color 0.3s, box-shadow 0.3s;
}

/* ===== 控制栏 ===== */
.control-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 0.8rem 1.5rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-main);
    padding-bottom: 0.8rem;
}

.lang-group, .style-group {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    flex-wrap: wrap;
}

.label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-right: 0.3rem;
    font-weight: 300;
    letter-spacing: 0.5px;
}

.lang-btn, .style-btn {
    background: transparent;
    border: 1px solid var(--btn-border);
    color: var(--btn-text);
    padding: 0.2rem 1rem;
    font-size: 0.8rem;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 300;
    background-color: var(--btn-bg);
}

.lang-btn:hover, .style-btn:hover {
    background-color: var(--btn-hover-bg);
    color: var(--btn-hover-text);
    border-color: var(--btn-hover-border);
}

.lang-btn.active, .style-btn.active {
    background-color: var(--btn-hover-bg);
    color: var(--btn-hover-text);
    border-color: var(--btn-hover-border);
    font-weight: 500;
}

/* ===== 内容切换 ===== */
.content {
    display: none;
    animation: fade 0.3s ease;
}
.content.active {
    display: block;
}
@keyframes fade {
    0% { opacity: 0.3; }
    100% { opacity: 1; }
}

/* ===== 头部 ===== */
header {
    border-bottom: 1px solid var(--border-main);
    padding-bottom: 0.8rem;
    margin-bottom: 2rem;
}
header h1 {
    font-size: 2.6rem;
    font-weight: 400;
    color: var(--text-header);
    letter-spacing: -1px;
    line-height: 1.2;
}
header .sub {
    color: var(--text-sub);
    font-size: 0.9rem;
    margin-top: 0.2rem;
    font-style: italic;
}

/* ===== 教程主体 ===== */
.tutorial h2 {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-strong);
    margin: 1.8rem 0 1rem 0;
    border-left: 4px solid var(--border-scheme);
    padding-left: 0.8rem;
}
.tutorial h2:first-of-type {
    margin-top: 0;
}

.scheme {
    background-color: var(--bg-scheme);
    border-left: 3px solid var(--border-scheme);
    padding: 1.2rem 1.5rem;
    margin-bottom: 1.8rem;
    border-radius: 0 8px 8px 0;
    transition: background-color 0.3s;
}
.scheme h3 {
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--text-header);
    margin-bottom: 0.8rem;
}

.badge {
    display: inline-block;
    background-color: var(--badge-bg);
    color: var(--badge-text);
    font-size: 0.7rem;
    padding: 0.1rem 0.8rem;
    border-radius: 20px;
    vertical-align: middle;
    margin-left: 0.6rem;
    font-weight: 300;
}

.links {
    list-style: none;
    padding-left: 0;
}
.links li {
    margin: 0.4rem 0;
    color: var(--text-body);
}
.links ul {
    list-style: none;
    padding-left: 1.8rem;
    margin: 0.2rem 0;
}
.links ul li {
    margin: 0.2rem 0;
    font-size: 0.95rem;
}

a {
    color: var(--link-color);
    text-decoration: none;
    border-bottom: 1px dotted var(--border-main);
    transition: color 0.2s, border-color 0.2s;
}
a:hover {
    color: var(--link-hover);
    border-bottom-color: var(--link-hover);
}

.net-id, .room {
    margin-top: 0.8rem;
    background-color: var(--id-bg);
    padding: 0.6rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border-main);
    transition: background-color 0.3s;
}
.net-id strong, .room strong {
    color: var(--text-strong);
    margin-right: 0.8rem;
}
.id, .code {
    color: var(--id-text);
    font-family: 'Courier New', monospace;
    word-break: break-all;
    font-size: 0.9rem;
    background-color: var(--bg-app);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    transition: color 0.3s, background-color 0.3s;
}
.code {
    font-size: 0.75rem;
    display: inline-block;
    max-width: 100%;
    overflow-x: auto;
}

.project {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-main);
}
.project h2 {
    border-left-color: var(--link-color);
}
.project p {
    margin-top: 0.5rem;
    font-size: 1.1rem;
}

/* ===== 页脚 ===== */
footer {
    margin-top: 2.5rem;
    text-align: right;
    border-top: 1px solid var(--border-main);
    padding-top: 1rem;
    color: var(--footer-color);
    font-size: 0.9rem;
    letter-spacing: 1px;
}

/* ===== 复制按钮 ===== */
#app .copy-btn {
    background: var(--copy-bg);
    border: 1px solid var(--copy-border);
    color: var(--copy-text);
    font-size: 0.65rem;
    padding: 0.1rem 0.8rem;
    border-radius: 14px;
    cursor: pointer;
    margin-left: 0.6rem;
    transition: all 0.2s;
    line-height: 1.6;
    vertical-align: middle;
    font-weight: 300;
    letter-spacing: 0.3px;
    box-shadow: none;
    appearance: none;
    -webkit-appearance: none;
}
#app .copy-btn:hover {
    background: var(--copy-hover-bg);
    border-color: var(--copy-hover-border);
    color: var(--copy-hover-text);
}
#app .copy-btn.copied {
    background: var(--link-color);
    border-color: var(--link-color);
    color: #fff;
}

/* ===== 响应式 ===== */
@media (max-width: 600px) {
    #app {
        padding: 1rem;
    }
    header h1 {
        font-size: 2rem;
    }
    .scheme {
        padding: 0.8rem 1rem;
    }
    .control-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }
    .lang-group, .style-group {
        justify-content: center;
    }
    .code {
        font-size: 0.65rem;
    }
}