/* ============================================================
   SPARTA — 空间攻击研究与战术分析矩阵（树型）
   设计语言：深空蓝黑 × 青蓝霓虹（与 CyberShell 博客统一）
   ============================================================ */

:root {
  --bg0:#050816; --bg1:#0b1126; --bg2:#111a38; --bg3:#1a2649;
  --line:rgba(122,162,255,.16); --line-strong:rgba(122,162,255,.34);
  --cyan:#22d3ee; --cyan-soft:rgba(34,211,238,.14);
  --blue:#3b82f6; --violet:#8b5cf6;
  --text:#eef3fb; --text-dim:#c2d0e6; --text-faint:#8aa2c8;
  --card:rgba(18,27,52,.78);
  --font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-mono:ui-monospace,"Cascadia Code",Consolas,"JetBrains Mono",Menlo,monospace;
  --ease:cubic-bezier(.4,0,.2,1);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--text);font-family:var(--font-sans);
  background:
    radial-gradient(1100px 520px at 12% -8%, rgba(122,162,255,.12), transparent 60%),
    radial-gradient(900px 480px at 90% 4%, rgba(34,211,238,.10), transparent 60%),
    var(--bg0);
  min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased;
}
a{color:var(--cyan);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:#7ff0ff}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}

/* ===== 顶栏 ===== */
.sp-topbar{position:sticky;top:0;z-index:50;background:rgba(6,10,24,.88);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.sp-topbar-inner{max-width:1320px;margin:0 auto;padding:13px 24px;display:flex;align-items:center;gap:16px}
.sp-brand{display:flex;align-items:center;gap:12px;min-width:0}
.sp-kicker{font-family:var(--font-mono);font-size:12px;letter-spacing:2.5px;color:var(--cyan);border:1px solid rgba(34,211,238,.4);border-radius:999px;padding:4px 12px;white-space:nowrap;background:var(--cyan-soft);text-shadow:0 0 8px rgba(34,211,238,.5)}
.sp-brand h1{margin:0;font-size:clamp(16px,1.9vw,21px);font-weight:700;white-space:nowrap}
.sp-actions{margin-left:auto;display:flex;gap:8px;flex:none}
.sp-actions .btn{font-family:var(--font-mono);font-size:12px;color:var(--text-dim);border:1px solid var(--line-strong);border-radius:8px;padding:7px 14px;background:rgba(13,22,48,.66);cursor:pointer;transition:all .2s;white-space:nowrap;line-height:1.4}
.sp-actions .btn:hover{color:var(--cyan);border-color:rgba(34,211,238,.6);box-shadow:0 0 12px rgba(34,211,238,.25)}
.sp-actions .btn-primary{color:#fff;border-color:var(--cyan);background:linear-gradient(180deg,rgba(34,211,238,.9),rgba(8,145,178,.9));box-shadow:0 2px 12px rgba(34,211,238,.35)}
.sp-actions .btn-primary:hover{filter:brightness(1.08)}

/* 中英文切换 */
.sp-lang{display:flex;gap:0;flex:none;font-family:var(--font-sans)}
.sp-lang button{padding:6px 13px;border:1px solid var(--line-strong);background:rgba(13,22,48,.8);color:var(--text-dim);font-size:13px;line-height:1.4;cursor:pointer;transition:all .2s;backdrop-filter:blur(8px)}
.sp-lang button:first-child{border-radius:8px 0 0 8px}
.sp-lang button:last-child{border-radius:0 8px 8px 0;border-left:none}
.sp-lang button:hover{color:var(--cyan);border-color:rgba(34,211,238,.5)}
.sp-lang button.active{background:linear-gradient(180deg,var(--cyan),#0891b2);color:#04121a;border-color:transparent;font-weight:700;box-shadow:0 0 10px rgba(34,211,238,.4)}

/* ===== Hero ===== */
.sp-hero{padding:54px 24px 30px;text-align:center;position:relative;overflow:hidden}
.sp-hero::before{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(560px 300px at 20% 8%,rgba(59,130,246,.14),transparent 62%),radial-gradient(520px 280px at 82% 12%,rgba(34,211,238,.12),transparent 62%)}
.sp-hero-inner{position:relative;z-index:1;max-width:820px;margin:0 auto}
.sp-hero-kicker{font-family:var(--font-mono);font-size:12px;letter-spacing:.3em;color:var(--cyan);text-shadow:0 0 10px rgba(34,211,238,.5);margin-bottom:16px}
.sp-hero-title{font-size:clamp(28px,4.4vw,42px);font-weight:800;margin:0 0 12px;letter-spacing:.03em;background:linear-gradient(120deg,#fff 20%,#67e8f9 60%,#7aa2ff);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.sp-hero-desc{color:var(--text-dim);font-size:15.5px;max-width:640px;margin:0 auto 22px}
.sp-stats{display:flex;justify-content:center;gap:52px;flex-wrap:wrap}
.sp-stat{text-align:center}
.sp-stat-num{font-family:var(--font-mono);font-size:28px;font-weight:700;color:var(--cyan);display:block;text-shadow:0 0 14px rgba(34,211,238,.55)}
.sp-stat-label{font-size:12px;letter-spacing:.24em;color:var(--text-faint);text-transform:uppercase}

/* ===== 搜索 ===== */
.sp-search{max-width:1320px;margin:6px auto 4px;padding:0 24px 8px}
.sp-search input{width:100%;padding:11px 16px;border-radius:10px;border:1px solid var(--line-strong);background:rgba(7,11,28,.7);color:var(--text);font-size:14px;font-family:var(--font-mono);transition:border-color .2s,box-shadow .2s}
.sp-search input:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 14px rgba(34,211,238,.3)}

/* ===== 布局 ===== */
.sp-layout{max-width:1320px;margin:0 auto;padding:8px 24px 40px;display:grid;grid-template-columns:250px minmax(0,1fr);gap:22px;align-items:start}

/* 左侧树导航 */
.sp-side{position:sticky;top:78px}
.sp-side-title{font-family:var(--font-mono);font-size:11px;letter-spacing:.3em;color:var(--text-faint);margin:0 0 8px;padding-left:4px}
.sp-side-nav{display:flex;flex-direction:column;gap:2px;max-height:calc(100vh - 120px);overflow:auto;padding-right:4px}
.sp-side-link{display:flex;align-items:center;gap:8px;padding:7px 10px;border-radius:8px;color:var(--text-dim);font-size:13.5px;border:1px solid transparent;transition:all .18s;font-family:var(--font-mono)}
.sp-side-link:hover{color:var(--cyan);background:rgba(34,211,238,.07)}
.sp-side-link.is-active{color:#04121a;background:linear-gradient(90deg,var(--cyan),var(--blue));border-color:transparent;font-weight:700}
.sp-side-link .side-id{font-size:10.5px;letter-spacing:.05em;opacity:.85}

/* ===== 矩阵树 ===== */
.sp-tree{min-width:0}
.sp-node {}
.sp-node-row{display:flex;align-items:center;gap:9px;padding:7px 12px;border-radius:8px;cursor:pointer;transition:background .18s;color:var(--text-dim);user-select:none}
.sp-node-row:hover{background:rgba(34,211,238,.06)}
.sp-node-row .label{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sp-node-row .en{font-family:var(--font-mono);font-size:10.5px;color:var(--text-faint);letter-spacing:.08em}
.sp-chevron{flex:none;width:0;height:0;border-left:5px solid currentColor;border-top:4px solid transparent;border-bottom:4px solid transparent;opacity:.6;transition:transform .2s var(--ease)}
.is-open>.sp-node-row .sp-chevron{transform:rotate(90deg)}

/* 树形引导线 */
.sp-branch{position:relative}
.sp-branch .sp-children{display:none;position:relative;margin-left:15px;padding-left:2px;border-left:1px solid rgba(122,162,255,.18)}
.sp-branch.is-open>.sp-children{display:block}
.sp-branch .sp-children::before{content:"";position:absolute;left:-1px;top:.5em;width:10px;height:1px;background:rgba(122,162,255,.30)}

/* 战术节点 */
.sp-tactic>.sp-node-row{background:var(--card);border:1px solid var(--line);border-radius:12px;margin:0 0 6px;padding:11px 14px;color:var(--text)}
.sp-tactic>.sp-node-row:hover{border-color:rgba(34,211,238,.45);background:rgba(22,34,64,.9)}
.sp-tactic.is-open>.sp-node-row{border-color:rgba(122,162,255,.45)}
.sp-tactic.is-open>.sp-node-row .sp-chevron{color:var(--cyan)}
.sp-tactic-badge{flex:none;font-family:var(--font-mono);font-size:10.5px;font-weight:700;padding:3px 8px;border-radius:7px;color:#04121a}
.sp-tactic .tactic-name{font-size:16px;font-weight:700;color:var(--text)}
.sp-tactic .count{margin-left:auto;flex:none;font-family:var(--font-mono);font-size:10.5px;color:var(--text-faint);text-align:right}

/* 技术节点 */
.sp-tech{position:relative}
.sp-tech-row{padding:5px 10px 5px 8px;color:var(--text)}
.sp-tech-row .tech-id{font-family:var(--font-mono);font-size:11px;color:var(--cyan);letter-spacing:.04em;flex:none}
.sp-tech-row .tech-name{font-size:13.5px}
.sp-tech-row .count{font-family:var(--font-mono);font-size:10.5px;color:var(--text-faint);flex:none;margin-left:auto}

/* 子技术节点 */
.sp-sub{position:relative}
.sp-sub-row{padding:4px 10px 4px 8px;color:var(--text-dim);font-size:13px}
.sp-sub-row:hover{background:rgba(34,211,238,.05)}
.sp-sub-row .sub-idx{font-family:var(--font-mono);font-size:10px;color:var(--text-faint);flex:none;width:18px;text-align:right}
.sp-sub-row .sub-name{min-width:0}

/* 技术/子技术详情块 */
.sp-desc{display:none;margin:4px 0 10px;padding:10px 14px 12px;border-left:2px solid rgba(34,211,238,.4);border-radius:0 10px 10px 0;background:rgba(7,11,28,.55)}
.sp-branch.is-open > .sp-desc{display:block}
.sp-desc .sp-desc-id{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--cyan)}
.sp-desc p{margin:8px 0 0;color:var(--text-dim);font-size:13px;line-height:1.75}
.sp-desc p.sp-desc-parent{color:var(--text-faint);font-size:12px;margin-top:10px;padding-top:8px;border-top:1px dashed rgba(122,162,255,.12)}
.sp-desc p.sp-desc-parent b{color:var(--text-dim)}
.sp-desc p.sp-desc-link{margin-top:10px}
.sp-desc p.sp-desc-link a{font-family:var(--font-mono);font-size:12px;color:var(--cyan)}

/* 空态提示 */
.sp-empty{padding:30px;text-align:center;color:var(--text-faint);font-family:var(--font-mono);font-size:13px}

/* 过滤隐藏 */
.sp-node.sp-nomatch{display:none}

/* ===== 页脚 ===== */
.sp-footer{border-top:1px solid var(--line);padding:24px 24px 36px;text-align:center;color:var(--text-faint);font-size:13px;background:linear-gradient(180deg,transparent,rgba(8,12,30,.8))}
.sp-footer p{margin:6px 0}
.sp-footer a{color:var(--text-dim)}
.sp-footer a:hover{color:var(--cyan)}

/* ===== 响应式 ===== */
@media (max-width:980px){
  .sp-layout{grid-template-columns:1fr}
  .sp-side{position:static}
  .sp-side-nav{flex-direction:row;flex-wrap:wrap;max-height:none;overflow:visible}
  .sp-side-link{font-size:12.5px}
}
@media (max-width:720px){
  .sp-topbar-inner{padding:10px 12px;gap:8px;flex-wrap:wrap}
  .sp-brand h1{white-space:normal;font-size:15px}
  .sp-lang button{padding:4px 9px;font-size:12px}
  .sp-actions .btn{font-size:11px;padding:6px 10px}
  .sp-hero{padding:36px 16px 22px}
  .sp-stats{gap:30px}
  .sp-search{padding:0 14px}
  .sp-layout{padding:6px 12px 28px}
}

/* ===== 减少动效 ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}