/* ==========================================================================
   Chao-UI Design System v1.0.0
   Authoritative CSS Variables & Layout Resets
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&family=Inconsolata:wght@400;500;600;700&display=swap');

:root {
  /* Fonts */
  --pf-font-sans-latin: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --pf-font-sans-sc: "IBM Plex Sans SC", "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --pf-font-sans-tc: "IBM Plex Sans TC", "Source Han Sans TC", "Noto Sans CJK TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --pf-font-sans-hc: "Source Han Sans HC", "Noto Sans CJK HK", "PingFang HK", "IBM Plex Sans TC", sans-serif;
  --pf-font-sans: var(--pf-font-sans-latin);
  --pf-font-serif-latin: "IBM Plex Serif", "STIX Two Text", serif;
  --pf-font-serif-sc: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", serif;
  --pf-font-serif-tc: "Source Han Serif TC", "Noto Serif CJK TC", "Songti TC", serif;
  --pf-font-serif: var(--pf-font-serif-latin);
  --pf-font-math: "IBM Plex Math", "STIX Two Math", "Cambria Math", serif;
  --pf-font-mono: "Inconsolata", monospace;
  --pf-font-mono-sc: "Sarasa Mono SC", "Sarasa Fixed SC", "Noto Sans Mono CJK SC", monospace;
  --pf-font-mono-tc: "Sarasa Mono TC", "Sarasa Fixed TC", "Noto Sans Mono CJK TC", monospace;

  /* Colors - Light Theme Default */
  --pf-bg: #ffffff;
  --pf-fg: #020618;
  --pf-muted: #62748e;
  --pf-border: #e2e8f0;
  --pf-border-strong: #cad5e2;
  --pf-hover: #f1f5f9;
  --pf-surface: #f8fafc;
  --pf-accent: #0f172b;
  --pf-accent-fg: #f8fafc;

  /* Color-on-Demand Badges */
  --pf-green: #008138;
  --pf-green-bg: #e6f6ec;
  --pf-green-border: #adf0c6;

  --pf-red: #9f1239;
  --pf-red-bg: #fff5f5;
  --pf-red-border: #f1b4b4;

  --pf-blue: #2563eb;
  --pf-mint: #22c55e;
  --pf-focus: #2563eb;

  /* Dimensions */
  --pf-radius: 0px; /* Forces flat 90-degree square corners */
  --pf-border-width: 1px;
}

html:lang(zh-CN),
html:lang(zh-SG) {
  --pf-font-sans: var(--pf-font-sans-sc);
  --pf-font-serif: var(--pf-font-serif-sc);
  --pf-font-mono: var(--pf-font-mono-sc);
}

html:lang(zh-TW),
html:lang(zh-MO) {
  --pf-font-sans: var(--pf-font-sans-tc);
  --pf-font-serif: var(--pf-font-serif-tc);
  --pf-font-mono: var(--pf-font-mono-tc);
}

html:lang(zh-HK) {
  --pf-font-sans: var(--pf-font-sans-hc);
  --pf-font-serif: var(--pf-font-serif-tc);
  --pf-font-mono: var(--pf-font-mono-tc);
}

/* Dark Mode Scheme Override */
html[data-theme="dark"] {
  --pf-bg: #0b1018;
  --pf-fg: #e6edf6;
  --pf-muted: #93a4b8;
  --pf-border: #27313f;
  --pf-border-strong: #3b4858;
  --pf-hover: #19212e;
  --pf-surface: #121a26;
  --pf-accent: #e6edf6;
  --pf-accent-fg: #0b1018;

  --pf-green: #4ade80;
  --pf-green-bg: #132d1d;
  --pf-green-border: #1b4e2d;

  --pf-red: #fca5a5;
  --pf-red-bg: #2a1416;
  --pf-red-border: #7f1d1d;
  --pf-focus: #93c5fd;
}

/* ==========================================================================
   CSS Resets & Layout Rules
   ========================================================================== */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border-radius: var(--pf-radius) !important; /* Enforces sharp 90-degree corners */
}

body {
  background-color: var(--pf-bg);
  color: var(--pf-fg);
  font-family: var(--pf-font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--pf-font-sans);
  font-weight: 600;
  color: var(--pf-accent);
}

code, pre, kbd, samp {
  font-family: var(--pf-font-mono);
  font-size: 0.9em;
}

math,
.pf-math-native {
  font-family: var(--pf-font-math);
}

:focus-visible {
  outline: 2px solid var(--pf-focus);
  outline-offset: 2px;
}

/* ==========================================================================
   Standard Components (Plex-Flat Style)
   ========================================================================== */

/* Flat Borders & Tables */
table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

th, td {
  padding: 8px 12px;
  border-bottom: var(--pf-border-width) solid var(--pf-border);
}

th {
  background-color: var(--pf-surface);
  font-weight: 600;
  border-bottom: 2px solid var(--pf-border-strong);
}

tr:hover td {
  background-color: var(--pf-hover);
}

/* Buttons */
button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  font-family: var(--pf-font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  background-color: var(--pf-bg);
  color: var(--pf-fg);
  border: var(--pf-border-width) solid var(--pf-border-strong);
  cursor: pointer;
  box-shadow: none;
  transition: background-color 0.15s ease;
}

button:hover, .btn:hover {
  background-color: var(--pf-hover);
}

button:disabled,
.btn[aria-disabled="true"],
input:disabled,
select:disabled,
textarea:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

button[aria-busy="true"],
.btn[aria-busy="true"] {
  cursor: progress;
}

button.primary, .btn-primary {
  background-color: var(--pf-accent);
  color: var(--pf-accent-fg);
  border-color: var(--pf-accent);
}

button.primary:hover, .btn-primary:hover {
  background-color: var(--pf-hover);
  color: var(--pf-fg);
}

/* Form Inputs */
input, select, textarea {
  padding: 6px 10px;
  font-family: var(--pf-font-sans);
  font-size: 0.9rem;
  border: var(--pf-border-width) solid var(--pf-border);
  background-color: var(--pf-bg);
  color: var(--pf-fg);
  outline: none;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--pf-border-strong);
  box-shadow: 0 0 0 1px var(--pf-border-strong);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* Status Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 6px;
  font-family: var(--pf-font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: var(--pf-border-width) solid var(--pf-border);
  background-color: var(--pf-surface);
}

.badge-online {
  color: var(--pf-green);
  background-color: var(--pf-green-bg);
  border-color: var(--pf-green-border);
}

.badge-offline {
  color: var(--pf-red);
  background-color: var(--pf-red-bg);
  border-color: var(--pf-red-border);
}

/* Histograms / Progress Bars */
.histogram-container {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--pf-font-mono);
  font-size: 0.85rem;
}

.histogram-bar {
  display: flex;
  height: 12px;
  background-color: var(--pf-hover);
  border: var(--pf-border-width) solid var(--pf-border);
  flex: 1;
}

.histogram-fill {
  height: 100%;
}

.histogram-fill-cpu {
  background-color: var(--pf-mint);
}

.histogram-fill-mem {
  background-color: var(--pf-blue);
}