/* 全站主题变量 + 切换按钮（与首页 index 深色方案一致） */
html { color-scheme: light; }
html[data-theme="dark"] { color-scheme: dark; }

:root {
    --primary: #0d6efd;
    --primary-dark: #0a58ca;
    --primary-light: #6ea8fe;
    --success: #198754;
    --success-bg: #d1e7dd;
    --success-text: #0f5132;
    --success-border: #badbcc;
    --danger: #dc3545;
    --danger-bg: #f8d7da;
    --danger-text: #842029;
    --danger-border: #f5c2c7;
    --info-bg: #e7f1ff;
    --info-border: #9ec5fe;
    --bg: #f0f4f8;
    --card: #ffffff;
    --text: #1a1d21;
    --text-muted: #6c757d;
    --border: #dee2e6;
    --shadow: 0 4px 20px rgba(13, 110, 253, 0.08);
    --radius: 12px;
    --input-placeholder: #adb5bd;
    --tabs-bg: #f1f5ff;
    --tab-active-bg: #ffffff;
    --tab-shadow: 0 2px 6px rgba(13, 110, 253, 0.15);
    --version-tag-bg: #e9ecef;
    --version-tag-text: #495057;
    --badge-permanent-bg: #d1e7dd;
    --badge-permanent-text: #0f5132;
    --focus-ring: rgba(13, 110, 253, 0.15);
    --focus-ring-strong: rgba(13, 110, 253, 0.2);
    --desc-bg: #f8f9fa;
    --modal-bg: rgba(255, 255, 255, 0.92);
    --modal-text: #1f2933;
    --modal-muted: #4b5563;
}

html[data-theme="dark"] {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --success: #34d399;
    --success-bg: #0c1f16;
    --success-text: #a7f3d0;
    --success-border: #14532d;
    --danger: #f87171;
    --danger-bg: #1f1215;
    --danger-text: #fecaca;
    --danger-border: #7f1d1d;
    --info-bg: #121c2c;
    --info-border: #1e3a5f;
    --bg: #0c1017;
    --card: #161d27;
    --text: #e6edf3;
    --text-muted: #8b949e;
    --border: #30363d;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
    --input-placeholder: #6e7681;
    --tabs-bg: #1c2433;
    --tab-active-bg: #222c3d;
    --tab-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
    --version-tag-bg: #21262d;
    --version-tag-text: #c9d1d9;
    --badge-permanent-bg: #0d2818;
    --badge-permanent-text: #a7f3d0;
    --focus-ring: rgba(59, 130, 246, 0.25);
    --focus-ring-strong: rgba(59, 130, 246, 0.35);
    --desc-bg: #1c2433;
    --modal-bg: rgba(22, 29, 39, 0.96);
    --modal-text: #e6edf3;
    --modal-muted: #9ca3af;
}

.theme-toggle {
    position: fixed;
    top: 14px;
    right: 14px;
    z-index: 100;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-muted);
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 999px;
    box-shadow: var(--shadow);
    cursor: pointer;
    font-family: inherit;
    transition: color 0.2s, background 0.2s, border-color 0.2s;
}
.theme-toggle:hover {
    color: var(--text);
    border-color: var(--primary-light);
}
.theme-toggle:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

@media (max-width: 480px) {
    .theme-toggle {
        top: 10px;
        right: 10px;
        padding: 10px 12px;
        font-size: 0.75rem;
    }
}

/* 首页顶栏内嵌主题按钮：不使用 fixed，避免与顶栏布局冲突 */
.portal-topbar .theme-toggle {
    position: static;
    top: auto;
    right: auto;
}