/* DCEC Platform — Design System (design_dcec_platform.md Section 0) */

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

:root {
  /* 0.1 Color Palette — Dark Theme */
  --bg-base: #020617;
  --bg-card: #0E1223;
  --bg-elevated: #1B2336;
  --color-primary: #2563EB;
  --color-secondary: #3B82F6;
  --color-success: #22C55E;
  --color-warning: #D97706;
  --color-danger: #EF4444;
  --text-primary: #F8FAFC;
  --text-muted: #94A3B8;
  --border-color: #334155;
  --ring-color: #2563EB40;

  /* 0.3 Spacing (8dp) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* 0.4 Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.5);

  /* Layout */
  --sidebar-width: 220px;
  --sidebar-collapsed: 56px;
}

/* Light Theme Override */
[data-theme="light"] {
  --bg-base: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-elevated: #F1F5F9;
  --text-primary: #0F172A;
  --text-muted: #64748B;
  --border-color: #E2E8F0;
  --ring-color: #2563EB40;
}

/* Reset */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

/* Body */
body {
  font-family: 'Fira Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
}

/* 0.2 Typography */
h1, h2, h3, h4 { font-family: 'Fira Code', monospace; font-weight: 600; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.125rem; }
h3 { font-size: 1rem; }
code, .mono { font-family: 'Fira Code', monospace; font-size: 0.875rem; }

/* Links */
a { color: var(--color-primary); text-decoration: none; transition: color 200ms ease; cursor: pointer; }
a:hover { color: var(--color-secondary); }

/* Global interaction polish */
button, [role="button"], .nav-item, .dash-card, .card { cursor: pointer; }
:focus-visible { box-shadow: 0 0 0 2px var(--ring-color); outline: none; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; } }

/* Skeleton loading shimmer */
@keyframes shimmer { 0% { background-position: -200% 0; } 100% { background-position: 200% 0; } }
.skeleton { background: linear-gradient(90deg, var(--bg-elevated) 25%, var(--border-color) 50%, var(--bg-elevated) 75%); background-size: 200% 100%; animation: shimmer 1.5s infinite; border-radius: 4px; height: 1em; }

/* === SIDEBAR === */
.sidebar {
  position: fixed; top: 0; left: 0; bottom: 0;
  width: var(--sidebar-width);
  background: var(--bg-card);
  border-right: 1px solid var(--border-color);
  padding: var(--space-md) 0;
  display: flex; flex-direction: column;
  z-index: 100;
  transition: width 200ms ease;
}
.sidebar-brand {
  padding: var(--space-md) var(--space-lg);
  font-family: 'Fira Code', monospace;
  font-size: 1rem; font-weight: 700;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--space-md);
}
.sidebar-section {
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.625rem; font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.sidebar-nav { flex: 1; overflow-y: auto; }
.nav-item {
  display: flex; align-items: center; gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  color: var(--text-muted);
  font-size: 0.875rem;
  transition: all 200ms ease;
  cursor: pointer;
  border-left: 3px solid transparent;
}
.nav-item:hover { color: var(--text-primary); background: var(--bg-elevated); }
.nav-item.active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  background: var(--bg-elevated);
}
.nav-item svg { width: 18px; height: 18px; stroke-width: 1.5; flex-shrink: 0; }
.sidebar-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--border-color);
  font-size: 0.75rem; color: var(--text-muted);
}

/* === MAIN === */
.main {
  margin-left: var(--sidebar-width);
  padding: var(--space-lg);
  min-height: 100vh;
}

/* === CARDS === */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
}
.card-title {
  font-size: 0.75rem; font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

/* === GRID === */
.grid { display: grid; gap: var(--space-md); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* === BADGES === */
.badge {
  display: inline-flex; align-items: center;
  padding: 2px 8px; border-radius: 12px;
  font-size: 0.75rem; font-weight: 600;
}
.badge-ok { background: #064e3b; color: var(--color-success); }
.badge-warn { background: #78350f; color: var(--color-warning); }
.badge-err { background: #7f1d1d; color: var(--color-danger); }
.badge-muted { background: var(--bg-elevated); color: var(--text-muted); }

/* === TABLE === */
.table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.table th {
  text-align: left; padding: var(--space-sm) var(--space-md);
  color: var(--text-muted); font-weight: 500;
  border-bottom: 1px solid var(--border-color);
}
.table td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--bg-elevated);
}
.table tr:hover td { background: var(--bg-elevated); }

/* === BUTTONS === */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-xs);
  padding: 6px 12px; border-radius: 6px;
  font-size: 0.8125rem; font-weight: 500;
  border: 1px solid var(--border-color);
  background: var(--bg-elevated);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 150ms ease;
}
.btn:hover { background: var(--border-color); }
.btn:focus { box-shadow: 0 0 0 3px var(--ring-color); outline: none; }
.btn-primary { background: var(--color-primary); border-color: var(--color-primary); }
.btn-primary:hover { background: #1d4ed8; }
.btn-danger { background: var(--color-danger); border-color: var(--color-danger); }
.btn-sm { padding: 3px 8px; font-size: 0.75rem; }

/* === GAUGE (Progress Bar) === */
.gauge { height: 8px; border-radius: 4px; background: var(--bg-elevated); overflow: hidden; }
.gauge-fill { height: 100%; border-radius: 4px; transition: width 300ms ease; }
.gauge-ok .gauge-fill { background: var(--color-success); }
.gauge-warn .gauge-fill { background: var(--color-warning); }
.gauge-danger .gauge-fill { background: var(--color-danger); }

/* === LOG VIEWER === */
.log-viewer {
  font-family: 'Fira Code', monospace;
  font-size: 0.8rem; color: var(--text-muted);
  background: var(--bg-base);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: var(--space-md);
  max-height: 400px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

/* === EVENT LIST === */
.event-item {
  display: flex; gap: var(--space-sm); align-items: flex-start;
  padding: var(--space-xs) 0;
  font-size: 0.8125rem;
  border-bottom: 1px solid var(--bg-elevated);
}
.event-time { color: var(--text-muted); white-space: nowrap; font-family: 'Fira Code', monospace; font-size: 0.75rem; }

/* === HTMX INDICATORS === */
.htmx-indicator { opacity: 0; transition: opacity 200ms ease; }
.htmx-request .htmx-indicator { opacity: 1; }

/* === FOCUS / ACCESSIBILITY === */
:focus-visible { box-shadow: 0 0 0 3px var(--ring-color); outline: none; }
[tabindex]:focus { box-shadow: 0 0 0 3px var(--ring-color); }

/* === 0.8 RESPONSIVE === */
@media (max-width: 1024px) {
  .sidebar { width: var(--sidebar-collapsed); }
  .sidebar .nav-text, .sidebar-section, .sidebar-brand span { display: none; }
  .main { margin-left: var(--sidebar-collapsed); }
}
@media (max-width: 768px) {
  .sidebar { display: none; }
  .main { margin-left: 0; padding: var(--space-md); padding-bottom: 72px; }
  .mobile-tabbar { display: flex; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid-auto { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
}
@media (max-width: 375px) {
  body { overflow-x: hidden; }
  .main { padding: var(--space-sm); padding-bottom: 72px; }
  .grid-auto { grid-template-columns: 1fr; }
  .card, .dash-card { padding: var(--space-md); }
}

/* Mobile Tab Bar */
.mobile-tabbar {
  display: none;
  position: fixed; bottom: 0; left: 0; right: 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  justify-content: space-around;
  padding: var(--space-sm) 0;
  z-index: 100;
}
.tab-item {
  display: flex; flex-direction: column; align-items: center;
  font-size: 0.625rem; color: var(--text-muted);
  cursor: pointer;
}
.tab-item.active { color: var(--color-primary); }
.tab-item svg { width: 20px; height: 20px; margin-bottom: 2px; }