/* ==========================================================================
   KENSOUL 设计系统 v2 · base.css
   基础层：设计变量 / 重置 / 排版尺度 / 栅格容器 / 工具类 / 图标
   作者：KENSOUL  更新：2026-09-29
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  /* 表面层级：底 → 卡片 → 浮起 → 高亮 */
  --bg: #07090f;
  --s1: #0c1017;
  --s2: #11161f;
  --s3: #161c27;
  --s4: #1c2431;

  /* 描边：统一 1px 体系，靠透明度分级 */
  --line: rgba(255, 255, 255, 0.07);
  --line-2: rgba(255, 255, 255, 0.11);
  --line-3: rgba(255, 255, 255, 0.18);

  /* 品牌与语义色（克制使用） */
  --cyan: #4cd6ff;
  --cyan-dim: rgba(76, 214, 255, 0.12);
  --cyan-line: rgba(76, 214, 255, 0.32);
  --violet: #8b7bff;
  --violet-dim: rgba(139, 123, 255, 0.12);
  --amber: #ffb454;
  --amber-dim: rgba(255, 180, 84, 0.12);
  --green: #37e1a0;
  --green-dim: rgba(55, 225, 160, 0.12);
  --rose: #ff7a8a;
  --rose-dim: rgba(255, 122, 138, 0.12);

  /* 文本三级 */
  --t1: #e8eef7;
  --t2: #a7b3c6;
  --t3: #7c8899;
  --t4: #5a6577;

  /* 字体：中文走系统栈，数字与代码走等宽 */
  --f: "Inter", "Segoe UI", system-ui, -apple-system, "PingFang SC",
    "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC",
    "Microsoft YaHei", sans-serif;
  --fm: "JetBrains Mono", "Cascadia Mono", ui-monospace, SFMono-Regular, Menlo,
    Consolas, "Courier New", monospace;

  /* 间距刻度（8pt 体系） */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;

  /* 圆角 */
  --r-1: 6px;
  --r-2: 8px;
  --r-3: 12px;
  --r-4: 16px;
  --r-full: 999px;

  /* 投影：深色底用暗影 + 内高光 */
  --sh-1: 0 1px 2px rgba(0, 0, 0, 0.4);
  --sh-2: 0 10px 30px -14px rgba(0, 0, 0, 0.75);
  --sh-3: 0 24px 56px -24px rgba(0, 0, 0, 0.85);
  --hi: inset 0 1px 0 rgba(255, 255, 255, 0.045);

  --container: 1240px;
  --header-h: 60px;
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--t1);
  font-family: var(--f);
  font-size: 15.5px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* 极浅网格 + 顶部辉光：替代满屏霓虹 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(820px 380px at 10% -10%, rgba(76, 214, 255, 0.10), transparent 70%),
    radial-gradient(720px 340px at 90% -6%, rgba(139, 123, 255, 0.09), transparent 70%),
    linear-gradient(rgba(255, 255, 255, 0.016) 1px, transparent 1px) 0 0 / 100% 40px,
    linear-gradient(90deg, rgba(255, 255, 255, 0.016) 1px, transparent 1px) 0 0 / 40px 100%;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: -0.012em;
  color: var(--t1);
}

p { margin: 0; }

a {
  color: var(--cyan);
  text-decoration: none;
  text-underline-offset: 3px;
  transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}
a:hover { color: #8ee7ff; }

img, svg, video { max-width: 100%; height: auto; display: block; }

hr { border: 0; border-top: 1px solid var(--line); margin: var(--s-6) 0; }

code, pre, kbd, samp { font-family: var(--fm); }

::selection { background: rgba(76, 214, 255, 0.26); color: #fff; }

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; border-radius: var(--r-1); }

::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: #0a0d14; }
::-webkit-scrollbar-thumb { background: #232c3b; border: 3px solid #0a0d14; border-radius: var(--r-full); }
::-webkit-scrollbar-thumb:hover { background: #33405a; }

/* ---------- 排版尺度 ---------- */
.ks-display {
  font-size: clamp(29px, 3.4vw, 44px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -0.022em;
}
.ks-h2 { font-size: clamp(20px, 1.9vw, 25px); line-height: 1.28; font-weight: 750; letter-spacing: -0.018em; }
.ks-h3 { font-size: 17.5px; line-height: 1.4; font-weight: 700; }
.ks-h4 { font-size: 15.5px; line-height: 1.45; font-weight: 650; }

.ks-lead { font-size: 16px; line-height: 1.8; color: var(--t2); }
.ks-small { font-size: 13.5px; }
.ks-tiny { font-size: 12.5px; }

.ks-muted { color: var(--t3); }
.ks-dim { color: var(--t4); }

/* 眉标：等宽小字即刊物式分层 */
.ks-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--fm);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--t3);
}
.ks-eyebrow::before { content: ""; width: 14px; height: 1px; background: var(--cyan); opacity: 0.8; }

.ks-num { font-family: var(--fm); font-variant-numeric: tabular-nums; }

/* 文字渐变：全站只用于品牌名与首屏主标，别处不用 */
.ks-grad {
  background: linear-gradient(96deg, #cfefff 0%, #7fdcff 42%, #a99bff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 栅格与容器 ---------- */
.ks-wrap { position: relative; z-index: 1; max-width: var(--container); margin: 0 auto; padding: 0 32px; }
.ks-wrap--narrow { max-width: 820px; }
@media (max-width: 760px) { .ks-wrap { padding: 0 16px; } }

.ks-section { margin: 64px 0; }
.ks-section--tight { margin: 40px 0; }

.ks-section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
}
.ks-section-head__main { min-width: 0; }
.ks-section-head .ks-h2 { margin-top: 3px; }
.ks-section-head__aside { flex: 0 0 auto; }

@media (max-width: 640px) {
  .ks-section { margin: 48px 0; }
  .ks-section-head { flex-direction: column; align-items: flex-start; gap: 8px; }
}

/* 双栏布局：主内容 + 侧栏 */
.ks-cols { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 40px; align-items: start; }
.ks-cols--wide { grid-template-columns: minmax(0, 1fr) 380px; }
@media (max-width: 1080px) { .ks-cols { grid-template-columns: minmax(0, 1fr); gap: 32px; } }

/* 卡片网格 */
.ks-grid { display: grid; gap: 16px; }
.ks-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.ks-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.ks-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 1080px) { .ks-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 900px) { .ks-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) {
  .ks-grid--2, .ks-grid--3, .ks-grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 工具类 ---------- */
.ks-stack > * + * { margin-top: 16px; }
.ks-stack-sm > * + * { margin-top: 8px; }
.ks-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.ks-spread { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.ks-grow { flex: 1 1 auto; min-width: 0; }
.ks-nowrap { white-space: nowrap; }

.ks-clamp-1, .ks-clamp-2, .ks-clamp-3 { display: -webkit-box; -webkit-box-orient: vertical; overflow: hidden; }
.ks-clamp-1 { -webkit-line-clamp: 1; }
.ks-clamp-2 { -webkit-line-clamp: 2; }
.ks-clamp-3 { -webkit-line-clamp: 3; }

.ks-sr, .ks-skip { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.ks-skip:focus { position: fixed; left: 16px; top: 12px; width: auto; height: auto; margin: 0; clip: auto; z-index: 999; background: var(--s3); border: 1px solid var(--line-3); border-radius: var(--r-2); padding: 10px 16px; color: var(--t1); }

/* ---------- 图标（统一 24px 网格 / 1.6 描边） ---------- */
.ks-i { width: 18px; height: 18px; flex: 0 0 auto; stroke: currentColor; fill: none; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.ks-i--sm { width: 15px; height: 15px; }
.ks-i--md { width: 20px; height: 20px; }
.ks-i--lg { width: 24px; height: 24px; }
.ks-i--xl { width: 28px; height: 28px; }

.ks-iconbox {
  width: 40px; height: 40px; flex: 0 0 auto;
  display: grid; place-items: center;
  border-radius: var(--r-2);
  background: linear-gradient(180deg, var(--s3), var(--s2));
  border: 1px solid var(--line-2);
  color: var(--cyan);
  box-shadow: var(--hi);
}
.ks-iconbox--lg { width: 48px; height: 48px; }
.ks-iconbox--violet { color: var(--violet); }
.ks-iconbox--amber { color: var(--amber); }
.ks-iconbox--green { color: var(--green); }
.ks-iconbox--rose { color: var(--rose); }

/* ---------- 无障碍与打印 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

@media print {
  body { background: #fff; color: #111; }
  body::before, .ks-header, .ks-footer, .ks-rail, .ks-toc, .ks-related, .ks-comments, .ks-progress { display: none !important; }
  .ks-prose, .ks-prose p, .ks-prose li, .ks-prose h2, .ks-prose h3 { color: #111; }
  a { color: #111; text-decoration: underline; }
}