/* webapp1 — Brutal minimal: monochrome, sharp typography, generous space */

:root {
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Instrument Sans', system-ui, sans-serif;
  --bg: #fafafa;
  --surface: #fff;
  --border: #e5e5e5;
  --text: #0a0a0a;
  --text-muted: #737373;
  --accent: #0a0a0a;
  --accent-hover: #262626;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --focus-ring: #0a0a0a;
  --shadow: 0 1px 2px rgba(0,0,0,.04);
  --radius: 0;
}

html.dark {
  --bg: #0a0a0a;
  --surface: #171717;
  --border: #262626;
  --text: #fafafa;
  --text-muted: #a3a3a3;
  --accent: #fafafa;
  --accent-hover: #e5e5e5;
  --danger: #ef4444;
  --danger-hover: #f87171;
  --focus-ring: #fafafa;
  --shadow: 0 1px 2px rgba(0,0,0,.3);
}

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

html { font-size: 16px; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 100;
}
.logo {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 0;
  flex: 1;
}
.nav-dropdown {
  position: relative;
}
.nav-trigger {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  border: none;
  padding: 0.5rem 1rem;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.nav-trigger:hover { color: var(--text); }
.nav-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 12rem;
  margin: 0;
  padding: 0.25rem 0;
  list-style: none;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity .15s, transform .15s, visibility .15s;
}
.nav-dropdown.open .nav-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-menu a {
  display: block;
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
  color: var(--text);
  text-decoration: none;
}
.nav-menu a:hover { background: var(--bg); }
.header-actions { margin-left: auto; }

/* Theme switch */
.theme-switch {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  position: relative;
  width: 2.5rem;
  height: 1.25rem;
}
.theme-switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.theme-slider {
  width: 100%;
  height: 100%;
  background: var(--border);
  transition: background .2s;
}
.theme-slider::before {
  content: '';
  position: absolute;
  width: 1rem;
  height: 1rem;
  left: 2px;
  top: 2px;
  background: var(--surface);
  border: 1px solid var(--border);
  transition: transform .2s;
}
.theme-switch input:checked + .theme-slider { background: var(--text-muted); }
.theme-switch input:checked + .theme-slider::before { transform: translateX(1.25rem); }

/* Page */
.page { max-width: 72rem; margin: 0 auto; padding: 2rem; }
.page-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.5rem; }
.page-title {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin: 0;
}
.btn {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.btn:hover { background: var(--bg); }
.btn-primary { background: var(--accent); color: var(--bg); border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-danger { color: var(--danger); }
.btn-danger:hover { color: var(--danger-hover); }
.btn-icon { background: none; border: none; padding: 0.25rem 0.5rem; font-size: 0.75rem; cursor: pointer; color: var(--text-muted); }
.btn-icon:hover { color: var(--text); }

/* Table */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); background: var(--surface); }
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}
.data-table th,
.data-table td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid var(--border); }
.data-table th {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: var(--bg); }
.data-table .actions { white-space: nowrap; }

/* Dialog */
.dialog {
  border: 1px solid var(--border);
  padding: 0;
  max-width: 28rem;
  background: var(--surface);
  box-shadow: 0 4px 24px rgba(0,0,0,.12);
}
.dialog::backdrop { background: rgba(0,0,0,.4); }
.dialog-inner { padding: 1.5rem; }
.dialog-title { font-family: var(--font-mono); font-size: 1rem; margin: 0 0 1rem; }
.dialog-desc { font-size: 0.875rem; color: var(--text-muted); margin: 0 0 1rem; }
.dialog-form label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}
.dialog-form input,
.dialog-form textarea {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  padding: 0.5rem;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}
.dialog-form input:focus,
.dialog-form textarea:focus {
  outline: none;
  border-color: var(--focus-ring);
  box-shadow: 0 0 0 2px var(--focus-ring);
}
.dialog-actions { display: flex; gap: 0.5rem; margin-top: 1rem; }
.dialog-actions .btn { flex: 0 0 auto; }