/* ============================================================
   核纪元 · 设计令牌 & 基础层
   深空控制室 / 工程蓝图 视觉体系
   ============================================================ */

:root {
  /* 底色 */
  --bg-0: #04080f;
  --bg-1: #071120;
  --bg-2: #0a1930;
  --panel: rgba(10, 22, 40, 0.72);
  --panel-2: rgba(14, 30, 52, 0.62);
  --panel-solid: #0a1626;
  --panel-raised: #0e2038;

  /* 线条 */
  --line: rgba(120, 180, 255, 0.13);
  --line-2: rgba(120, 190, 255, 0.24);
  --line-3: rgba(130, 200, 255, 0.4);

  /* 文字 */
  --text: #e9f2ff;
  --text-2: #a2b7d0;
  --text-3: #6f88a5;

  /* 强调色 */
  --cyan: #38e1ff;
  --cyan-soft: rgba(56, 225, 255, 0.14);
  --green: #3ef0a2;
  --green-soft: rgba(62, 240, 162, 0.13);
  --amber: #ffc857;
  --amber-soft: rgba(255, 200, 87, 0.13);
  --red: #ff6b6b;
  --red-soft: rgba(255, 107, 107, 0.13);
  --violet: #a78bfa;
  --violet-soft: rgba(167, 139, 250, 0.14);

  /* 三回路配色 */
  --loop-1: #ffab3d;   /* 一回路：带放射性 */
  --loop-2: #38e1ff;   /* 二回路：蒸汽 */
  --loop-3: #3ef0a2;   /* 三回路：冷却水 */

  /* 形状 */
  --r-xs: 8px;
  --r-sm: 12px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 28px;
  --radius: var(--r-md);

  --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.28);
  --shadow-md: 0 14px 40px rgba(0, 0, 0, 0.38);
  --shadow-lg: 0 28px 80px rgba(0, 0, 0, 0.5);
  --glow-cyan: 0 0 0 1px rgba(56, 225, 255, 0.3), 0 0 28px rgba(56, 225, 255, 0.18);
  --glow-green: 0 0 0 1px rgba(62, 240, 162, 0.3), 0 0 28px rgba(62, 240, 162, 0.16);

  /* 字体 */
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
    system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  /* 动效 */
  --ease-out: cubic-bezier(0.22, 0.9, 0.32, 1);
  --ease-spring: cubic-bezier(0.34, 1.4, 0.64, 1);
  --dur: 0.35s;

  --header-h: 66px;
  --content-max: 1240px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  color: var(--text);
  background-color: var(--bg-0);
  background-image:
    radial-gradient(1100px 620px at 78% -8%, rgba(56, 225, 255, 0.1), transparent 62%),
    radial-gradient(900px 560px at 6% 12%, rgba(62, 240, 162, 0.07), transparent 60%),
    radial-gradient(700px 700px at 50% 118%, rgba(167, 139, 250, 0.08), transparent 65%),
    linear-gradient(180deg, #050b15 0%, #04080f 60%, #04070d 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* 蓝图网格 + 噪点 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(120, 190, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 190, 255, 0.045) 1px, transparent 1px),
    linear-gradient(rgba(120, 190, 255, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 190, 255, 0.022) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px, 24px 24px, 24px 24px;
  mask-image: radial-gradient(ellipse 100% 82% at 50% 26%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 100% 82% at 50% 26%, #000 20%, transparent 78%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
}

/* 主内容层级 */
.app-header,
#view,
.app-footer {
  position: relative;
  z-index: 1;
}

/* ---------- 排版 ---------- */
h1,
h2,
h3,
h4,
p,
figure {
  margin: 0;
}

h1 {
  font-size: clamp(30px, 4.6vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 800;
}

h2 {
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-weight: 750;
}

h3 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0;
}

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

a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

::selection {
  background: rgba(56, 225, 255, 0.28);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

/* 滚动条 */
* {
  scrollbar-width: thin;
  scrollbar-color: rgba(120, 190, 255, 0.32) transparent;
}

*::-webkit-scrollbar {
  width: 9px;
  height: 9px;
}

*::-webkit-scrollbar-thumb {
  background: rgba(120, 190, 255, 0.26);
  border-radius: 99px;
  border: 2px solid transparent;
  background-clip: content-box;
}

*::-webkit-scrollbar-thumb:hover {
  background: rgba(120, 190, 255, 0.44);
  background-clip: content-box;
}

/* ---------- 工具类 ---------- */
.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: var(--r-sm);
  background: var(--cyan);
  color: #04121c;
  font-weight: 700;
  transition: top 0.2s var(--ease-out);
}

.skip-link:focus {
  top: 12px;
  text-decoration: none;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

.muted {
  color: var(--text-2);
}

.dim {
  color: var(--text-3);
}

.text-green { color: var(--green); }
.text-cyan { color: var(--cyan); }
.text-amber { color: var(--amber); }
.text-red { color: var(--red); }

.hidden {
  display: none !important;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.wrap {
  flex-wrap: wrap;
}

.spacer {
  flex: 1;
}

.center {
  text-align: center;
}

/* ---------- 动画 ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes popIn {
  0% { opacity: 0; transform: scale(0.92); }
  100% { opacity: 1; transform: scale(1); }
}

@keyframes pulseGlow {
  0%, 100% { opacity: 0.55; }
  50% { opacity: 1; }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-7px); }
  40% { transform: translateX(7px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

@keyframes flashBorder {
  0%, 100% { box-shadow: 0 0 0 1px var(--line); }
  50% { box-shadow: 0 0 0 2px var(--cyan), 0 0 30px rgba(56, 225, 255, 0.35); }
}

@keyframes dashFlow {
  to { stroke-dashoffset: -240; }
}

@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.anim-fade-up { animation: fadeUp 0.55s var(--ease-out) both; }
.anim-fade { animation: fadeIn 0.4s ease both; }
.anim-pop { animation: popIn 0.4s var(--ease-spring) both; }
.d1 { animation-delay: 0.06s; }
.d2 { animation-delay: 0.12s; }
.d3 { animation-delay: 0.18s; }
.d4 { animation-delay: 0.24s; }
.d5 { animation-delay: 0.3s; }

.shake { animation: shake 0.4s var(--ease-out); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body.reduce-motion *,
body.reduce-motion *::before,
body.reduce-motion *::after {
  animation: none !important;
  transition-duration: 0.001ms !important;
}