/* base.css — Reset, CSS custom properties, typography, layout utilities */

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

:root {
  /* Brand */
  --color-primary:       #1a4f8a;
  --color-primary-dark:  #13396b;
  --color-primary-light: #e8f0fb;

  /* Surface */
  --color-bg:            #f1f5f9;
  --color-surface:       #ffffff;
  --color-border:        #e2e8f0;
  --color-border-strong: #cbd5e1;

  /* Text */
  --color-text:          #1e293b;
  --color-text-muted:    #64748b;
  --color-text-faint:    #94a3b8;

  /* Feedback */
  --color-success:       #16a34a;
  --color-warning:       #d97706;
  --color-danger:        #dc2626;

  /* Category badges */
  --color-metal:         #2563eb;
  --color-metal-bg:      #dbeafe;
  --color-plastic:       #059669;
  --color-plastic-bg:    #d1fae5;
  --color-ceramic:       #d97706;
  --color-ceramic-bg:    #fef3c7;
  --color-composite:        #7c3aed;
  --color-composite-bg:     #ede9fe;
  --color-glass:            #0369a1;
  --color-glass-bg:         #e0f2fe;
  --color-natural-material: #9a3412;
  --color-natural-material-bg: #ffedd5;
  --color-elastomer:        #0f766e;
  --color-elastomer-bg:     #ccfbf1;
  --color-uncommon:         #64748b;
  --color-uncommon-bg:      #f1f5f9;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
               'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;

  /* Spacing scale */
  --sp-1:  4px;
  --sp-2:  8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;

  /* Aliases (used by components and page styles) */
  --color-muted:   #64748b;   /* same as --color-text-muted */
  --skeleton-bg:   #e2e8f0;

  /* Shape */
  --radius:    6px;
  --radius-lg: 10px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow:    0 1px 4px rgba(0,0,0,0.10);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.10);

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

html { font-size: 16px; }

body {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

h1 { font-size: 1.25rem; font-weight: 700; }
h2 { font-size: 1rem;    font-weight: 600; }
h3 { font-size: 0.875rem; font-weight: 600; }

/* ── Site header ──────────────────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 var(--sp-6);
  max-width: 1400px;
  margin: 0 auto;
}

.site-title h1 { font-size: 1.1rem; color: #fff; }
.site-subtitle  { font-size: 0.75rem; color: rgba(255,255,255,0.7); }

.site-nav { display: flex; gap: var(--sp-2); }

.nav-link {
  color: rgba(255,255,255,0.85);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background 0.15s;
}
.nav-link:hover,
.nav-link.active {
  background: rgba(255,255,255,0.15);
  color: #fff;
  text-decoration: none;
}

button.nav-link {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  opacity: 0.7;
}
button.nav-link:hover { opacity: 1; }

/* ── Utility ──────────────────────────────────────────────────────────── */

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap;
}

.error-message {
  color: var(--color-danger);
  padding: var(--sp-4);
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius);
  margin: var(--sp-4);
}

/* ── One-time disclaimer modal ────────────────────────────────────────── */

#disclaimer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.disclaimer-modal {
  background: #fff;
  border-radius: var(--radius);
  padding: 2rem 2.5rem;
  max-width: 560px;
  width: calc(100% - 2rem);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.disclaimer-modal h2 {
  margin: 0 0 1rem;
  font-size: 1.15rem;
  color: var(--color-text);
}

.disclaimer-modal p {
  font-size: 0.9rem;
  line-height: 1.6;
  color: #444;
  margin: 0 0 0.85rem;
}

.disclaimer-modal p:last-of-type { margin-bottom: 1.5rem; }