/* ============================
   TKubeOS 官网全局样式
   ============================ */
:root {
    --bg: #0b0f1a;
    --bg-soft: #101828;
    --card: #141c2e;
    --card-hover: #1a2438;
    --border: #24304a;
    --text: #e6ebf5;
    --text-dim: #9aa7bf;
    --accent: #35d0ba;
    --accent-2: #4f8cff;
    --warn: #ffb02e;
    --radius: 14px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
}

a { color: var(--accent); text-decoration: none; }
a:hover { opacity: .85; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ---------- 头部 ---------- */
.site-header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(11, 15, 26, .85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}
.header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}
.logo { display: flex; align-items: center; gap: 8px; font-size: 20px; color: var(--text); }
.logo-mark { color: var(--accent); }
.logo-text b, .footer-logo b { color: var(--accent); }
.main-nav { display: flex; gap: 6px; }
.main-nav a {
    color: var(--text-dim); padding: 8px 14px; border-radius: 8px;
    font-size: 15px; transition: all .2s;
}
.main-nav a:hover { color: var(--text); background: var(--card); opacity: 1; }
.main-nav a.active { color: var(--accent); background: var(--card); }

/* ---------- 按钮 ---------- */
.btn {
    display: inline-block; padding: 12px 28px; border-radius: 10px;
    font-size: 16px; font-weight: 600; transition: all .2s; cursor: pointer;
}
.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #06121f;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(53, 208, 186, .3); opacity: 1; }
.btn-outline { border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); opacity: 1; }
.btn-sm { padding: 7px 16px; font-size: 14px; }

/* ---------- Hero ---------- */
.hero {
    padding: 96px 0 72px; text-align: center; position: relative; overflow: hidden;
}
.hero::before {
    content: ""; position: absolute; inset: 0;
    background:
        radial-gradient(600px 300px at 20% 10%, rgba(79, 140, 255, .12), transparent),
        radial-gradient(600px 300px at 80% 20%, rgba(53, 208, 186, .10), transparent);
    pointer-events: none;
}
.hero-badge {
    display: inline-block; padding: 6px 16px; border-radius: 999px;
    border: 1px solid var(--border); background: var(--card);
    color: var(--accent); font-size: 13px; margin-bottom: 24px;
}
.hero h1 {
    font-size: 52px; line-height: 1.2; margin-bottom: 20px;
    background: linear-gradient(135deg, #fff, var(--accent) 60%, var(--accent-2));
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.sub {
    font-size: 18px; color: var(--text-dim); max-width: 640px; margin: 0 auto 36px;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ---------- 数据条 ---------- */
.stats {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
    margin: 56px auto 0; position: relative;
}
.stat-item {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 22px 12px; text-align: center;
}
.stat-item .num { font-size: 30px; font-weight: 700; color: var(--accent); }
.stat-item .label { font-size: 13px; color: var(--text-dim); margin-top: 4px; }

/* ---------- 通用区块 ---------- */
section.block { padding: 72px 0; }
.block-title { text-align: center; margin-bottom: 44px; }
.block-title h2 { font-size: 34px; margin-bottom: 10px; }
.block-title p { color: var(--text-dim); font-size: 16px; }

/* ---------- 卡片网格 ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }

.card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 28px; transition: all .25s;
}
.card:hover { background: var(--card-hover); transform: translateY(-3px); border-color: rgba(53, 208, 186, .4); }
.card .icon { font-size: 32px; margin-bottom: 14px; display: block; }
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--text-dim); font-size: 14.5px; }

.tag {
    display: inline-block; padding: 2px 10px; border-radius: 6px;
    font-size: 12px; margin: 4px 6px 0 0;
    background: rgba(53, 208, 186, .12); color: var(--accent);
    border: 1px solid rgba(53, 208, 186, .3);
}
.tag.blue { background: rgba(79, 140, 255, .12); color: var(--accent-2); border-color: rgba(79, 140, 255, .3); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; background: var(--card); }
th, td { padding: 14px 18px; text-align: left; font-size: 14.5px; }
th { background: var(--bg-soft); color: var(--accent); font-weight: 600; white-space: nowrap; }
td { border-top: 1px solid var(--border); color: var(--text-dim); }
td b, tr td:first-child { color: var(--text); }

/* ---------- 徽章 ---------- */
.badge {
    display: inline-block; padding: 3px 12px; border-radius: 999px;
    font-size: 12.5px; font-weight: 600;
}
.badge-green { background: rgba(53, 208, 186, .15); color: var(--accent); }
.badge-blue { background: rgba(79, 140, 255, .15); color: var(--accent-2); }

/* ---------- 提示框 ---------- */
.notice {
    border-radius: var(--radius); padding: 18px 22px; margin: 20px 0;
    font-size: 14.5px; border: 1px solid;
}
.notice-warn { background: rgba(255, 176, 46, .08); border-color: rgba(255, 176, 46, .35); color: #ffd78f; }
.notice-info { background: rgba(79, 140, 255, .08); border-color: rgba(79, 140, 255, .35); color: #bcd3ff; }

/* ---------- 代码块 ---------- */
.code-block {
    background: #0d1322; border: 1px solid var(--border); border-radius: 10px;
    padding: 16px 20px; font-family: Consolas, "Courier New", monospace;
    font-size: 13.5px; color: #9fe8dc; overflow-x: auto; margin: 12px 0;
}
.code-block .cmt { color: #5c6a85; }

/* ---------- FAQ ---------- */
.faq-item {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); margin-bottom: 14px; padding: 20px 24px;
}
.faq-item summary {
    cursor: pointer; font-weight: 600; font-size: 16px; color: var(--text);
    list-style: none; position: relative; padding-right: 24px;
}
.faq-item summary::after { content: "＋"; position: absolute; right: 0; color: var(--accent); }
.faq-item[open] summary::after { content: "－"; }
.faq-item .faq-body { margin-top: 12px; color: var(--text-dim); font-size: 14.5px; }

/* ---------- 步骤 ---------- */
.step { display: flex; gap: 18px; margin-bottom: 28px; }
.step-num {
    flex-shrink: 0; width: 36px; height: 36px; border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #06121f; font-weight: 700; display: flex; align-items: center; justify-content: center;
}
.step-body h3 { font-size: 17px; margin-bottom: 6px; }
.step-body p, .step-body li { color: var(--text-dim); font-size: 14.5px; }
.step-body ul { padding-left: 20px; }

/* ---------- 页脚 ---------- */
.site-footer {
    border-top: 1px solid var(--border); background: var(--bg-soft);
    margin-top: 40px; padding: 48px 0 28px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
.footer-logo { font-size: 22px; margin-bottom: 10px; }
.footer-desc { color: var(--text-dim); font-size: 14px; max-width: 320px; }
.footer-col h4 { font-size: 15px; margin-bottom: 12px; color: var(--text); }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: var(--text-dim); font-size: 14px; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
    border-top: 1px solid var(--border); padding-top: 20px; text-align: center;
    color: var(--text-dim); font-size: 13px;
}
.footer-note { margin-top: 6px; font-size: 12px; opacity: .7; }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
    .hero h1 { font-size: 36px; }
    .stats { grid-template-columns: repeat(2, 1fr); }
    .grid-3, .grid-2 { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .main-nav { display: none; }
}