* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, sans-serif;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #e0e7ff;
    --accent: #8b5cf6;
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.04);
    --shadow-hover: 0 8px 24px rgba(99,102,241,0.15);
    --radius: 12px;
    --radius-lg: 16px;
    --transition: 0.2s ease;
}

[data-theme="dark"] {
    --primary: #818cf8;
    --primary-dark: #6366f1;
    --primary-light: #1e1b4b;
    --accent: #a78bfa;
    --bg: #0f172a;
    --bg-card: #1e293b;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --border-light: #1e293b;
    --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 4px 16px rgba(0,0,0,0.2);
    --shadow-hover: 0 8px 24px rgba(129,140,248,0.2);
}

body {
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background var(--transition), color var(--transition);
}

/* ── 导航栏 ── */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5vw;
    height: 64px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 99;
    flex-wrap: wrap;
    gap: 10px;
    transition: background var(--transition), border-color var(--transition);
}

.logo {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    align-items: center;
}

.nav-menu a {
    margin: 0 4px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary);
    background: var(--primary-light);
}

/* ── 日月开关 ── */
.theme-toggle {
    background: none;
    border: 1.5px solid var(--border);
    border-radius: 50px;
    padding: 6px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
    transition: var(--transition);
    margin-left: 8px;
}

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

.theme-toggle .icon {
    font-size: 14px;
}

/* ── 语言选择器 ── */
.lang-select {
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: 8px;
    padding: 5px 10px;
    font-size: 13px;
    color: var(--text);
    cursor: pointer;
    transition: var(--transition);
    margin-left: 8px;
    appearance: none;
    -webkit-appearance: none;
}

.lang-select:hover {
    border-color: var(--primary);
}

.lang-select option {
    background: var(--bg-card);
    color: var(--text);
}

/* ── 首屏 Banner ── */
.banner {
    width: 100%;
    min-height: 55vh;
    background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 50%, #c7d2fe 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 60px 20px;
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .banner {
    background: linear-gradient(135deg, #1e1b4b 0%, #1e293b 50%, #0f172a 100%);
}

.banner::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99,102,241,0.08) 0%, transparent 60%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, -30px); }
}

.banner .badge {
    display: inline-block;
    background: rgba(99,102,241,0.12);
    color: var(--primary);
    font-size: 12px;
    font-weight: 600;
    padding: 4px 14px;
    border-radius: 99px;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
    border: 1px solid rgba(99,102,241,0.2);
}

.banner h1 {
    font-size: clamp(28px, 5vw, 52px);
    color: var(--text);
    margin-bottom: 16px;
    line-height: 1.2;
    font-weight: 800;
    position: relative;
    transition: color var(--transition);
}

.banner h1 span {
    display: block;
    font-size: 0.5em;
    color: var(--text-muted);
    font-weight: 400;
    margin-top: 12px;
    letter-spacing: 0;
}

.banner p {
    font-size: 16px;
    max-width: 600px;
    margin-bottom: 28px;
    color: var(--text-muted);
    position: relative;
    transition: color var(--transition);
}

.btn-group {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
    position: relative;
}

.btn {
    padding: 12px 28px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 12px rgba(99,102,241,0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99,102,241,0.4);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--primary);
    border: 1.5px solid var(--border);
}

.btn-secondary:hover {
    background: var(--primary-light);
    border-color: var(--primary);
}

/* ── 通用容器 & 卡片 ── */
.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 48px 20px;
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 28px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.card h2 {
    color: var(--text);
    margin-bottom: 12px;
    font-size: 20px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card h2::before {
    content: '';
    width: 4px;
    height: 20px;
    background: var(--primary);
    border-radius: 2px;
}

.card > p {
    color: var(--text-muted);
    margin-bottom: 24px;
    font-size: 15px;
    line-height: 1.7;
}

/* ── 功能网格 ── */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.grid-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: var(--transition);
}

.grid-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}

.grid-item h3 {
    color: var(--primary);
    font-size: 15px;
    margin-bottom: 8px;
    font-weight: 600;
}

.grid-item p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ── 下载区 ── */
.download-box {
    background: linear-gradient(135deg, var(--primary-light), rgba(139,92,246,0.08));
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    margin-bottom: 16px;
}

.download-box h3 {
    color: var(--text);
    font-size: 15px;
    margin-bottom: 10px;
    font-weight: 600;
}

.download-box p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.download-link {
    display: block;
    padding: 13px 20px;
    background: var(--primary);
    color: #fff;
    border-radius: 10px;
    text-decoration: none;
    margin: 10px 0;
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
}

.download-link:hover {
    background: var(--primary-dark);
    transform: scale(1.01);
}

.download-link.alt {
    background: #3b82f6;
}

.download-link.alt:hover {
    background: #2563eb;
}

.version-note {
    margin-top: 16px;
    padding: 14px 16px;
    background: rgba(59,130,246,0.08);
    border-radius: 8px;
    border-left: 3px solid #3b82f6;
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.7;
}

/* ── 社群区域 ── */
.social-box {
    background: linear-gradient(135deg, var(--primary-light), rgba(139,92,246,0.06));
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
}

.social-box h3 {
    color: var(--text);
    font-size: 15px;
    margin-bottom: 8px;
    font-weight: 600;
}

.social-box p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 14px;
}

.tip-text {
    color: #ef4444;
    font-size: 12px;
    margin: 6px 0 12px;
}

.row-box {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin: 8px 0;
}

.social-link {
    padding: 9px 20px;
    background: var(--primary);
    color: #fff;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
    min-height: 40px;
    display: inline-flex;
    align-items: center;
}

.social-link:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.social-link.chan {
    background: #3b82f6;
}

.social-link.chan:hover {
    background: #2563eb;
}

.social-link.copy {
    background: #6366f1;
}

.social-link.copy:hover {
    background: #4f46e5;
}

/* ── 适配清单 ── */
.device-list {
    list-style: none;
    margin-top: 12px;
}

.device-list li {
    padding: 10px 0;
    font-size: 14px;
    color: var(--text);
    border-bottom: 1px dashed var(--border);
    transition: color var(--transition), border-color var(--transition);
}

.device-list li:last-child {
    border-bottom: none;
}

/* ── 教程列表 ── */
.guide-list {
    padding-left: 20px;
}

.guide-list li {
    margin-bottom: 14px;
    font-size: 14px;
    color: var(--text);
    line-height: 1.7;
    transition: color var(--transition);
}

.guide-list li strong {
    color: var(--primary);
}

/* ── 页脚 ── */
footer {
    text-align: center;
    padding: 36px 20px;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 13px;
    transition: background var(--transition), border-color var(--transition), color var(--transition);
}

footer a {
    color: var(--primary);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

footer p {
    margin-bottom: 6px;
}

/* ── Toast 提示 ── */
.toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text);
    color: var(--bg);
    padding: 10px 24px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 500;
    display: none;
    z-index: 9999;
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

html {
    scroll-behavior: smooth;
}

/* ── 响应式 ── */
@media (max-width: 768px) {
    nav {
        padding: 0 4vw;
    }
    .nav-menu a {
        margin: 0 2px;
        padding: 5px 10px;
        font-size: 13px;
    }
    .card {
        padding: 24px;
    }
    .banner {
        min-height: 50vh;
        padding: 40px 20px;
    }
}