/* ============================================================
   SafetyTopic — style.css
   Clean, professional, responsive. No framework needed.
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  --color-bg:           #f4f5f7;
  --color-surface:      #ffffff;
  --color-border:       #e2e4e9;
  --color-text:         #1a1d23;
  --color-text-muted:   #5a6070;
  --color-accent:       #0096C7;       /* safety teal */
  --color-accent-dark:  #007BAD;       /* teal hover */
  --color-accent-light: #e0f4fc;       /* teal tint */
  --color-orange:       #F4831F;       /* safety orange */
  --color-orange-dark:  #d96e10;       /* orange hover */
  --color-orange-light: #fef0e3;       /* orange tint */
  --color-gold:         #c8891a;       /* stat callout gold */
  --color-gold-light:   #fdf3e0;
  --color-success:      #1a7a4a;
  --color-shadow:       rgba(0,0,0,0.08);

  /* Source badge colors */
  --badge-osha:         #c0392b;
  --badge-osha-bg:      #fdecea;
  --badge-doe:          #00508c;
  --badge-doe-bg:       #e8f0f8;
  --badge-niosh:        #1a7a4a;
  --badge-niosh-bg:     #e8f5ee;

  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  16px;
  --shadow-card: 0 2px 12px var(--color-shadow);
  --transition: 0.18s ease;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* ---------- Header / Hero ---------- */
.site-header {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

/* Top nav strip */
.header-nav-row {
  max-width: 860px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Hero area */
.hero-row {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 20px 44px;
  border-top: 1px solid rgba(255,255,255,0.15);
}

.hero-eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
  margin-bottom: 10px;
}

.hero-headline {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.15;
  color: #fff;
  letter-spacing: -0.03em;
  margin-bottom: 14px;
}

.hero-mark {
  background: var(--color-orange);
  color: #fff;
  padding: 2px 10px 4px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.hero-sub {
  font-size: 1rem;
  color: rgba(255,255,255,0.78);
  line-height: 1.65;
  max-width: 520px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.brand:hover { text-decoration: none; opacity: 0.9; }

.brand-mark {
  font-size: 1rem;
  color: #ffd97a;
}

.brand-name { color: #fff; }

.header-nav-link {
  color: rgba(255,255,255,0.85);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  border: 1.5px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-sm);
  padding: 6px 14px;
  transition: all var(--transition);
  white-space: nowrap;
}
.header-nav-link:hover {
  color: #fff;
  border-color: rgba(255,255,255,0.65);
  background: rgba(255,255,255,0.12);
  text-decoration: none;
}

/* ---------- Main Layout ---------- */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 28px 20px 40px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ---------- Controls Bar ---------- */
.controls {
  display: flex;
  align-items: flex-end;
  gap: 14px;
  flex-wrap: wrap;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex: 1;
  min-width: 180px;
}

.control-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

.select {
  appearance: none;
  background: var(--color-surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%235a6070' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat right 12px center;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 9px 36px 9px 12px;
  font-size: 0.92rem;
  color: var(--color-text);
  cursor: pointer;
  transition: border-color var(--transition);
  width: 100%;
}
.select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.control-actions {
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 9px 18px;
  transition: background var(--transition), color var(--transition),
              transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--color-orange);
  color: #fff;
  box-shadow: 0 1px 4px rgba(244,131,31,0.30);
}
.btn-primary:hover {
  background: var(--color-orange-dark);
  box-shadow: 0 2px 8px rgba(244,131,31,0.35);
}

.btn-ghost {
  background: var(--color-surface);
  color: var(--color-text-muted);
  border: 1.5px solid var(--color-border);
}
.btn-ghost:hover {
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* ---------- Topic Card ---------- */
.topic-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 36px 40px;
  display: flex;
  flex-direction: column;
  gap: 22px;
  border: 1px solid var(--color-border);
  transition: opacity 0.2s ease;
}

.topic-card.loading { opacity: 0.4; pointer-events: none; }

/* Card header row */
.topic-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.topic-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 100px;
}
.badge-osha   { background: var(--badge-osha-bg);  color: var(--badge-osha); }
.badge-doe    { background: var(--badge-doe-bg);   color: var(--badge-doe); }
.badge-niosh  { background: var(--badge-niosh-bg); color: var(--badge-niosh); }
.badge-other  { background: #f0f0f0; color: #555; }

.badge-category {
  background: #f0f0f0;
  color: var(--color-text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 3px 9px;
  border-radius: 100px;
}

.topic-duration {
  font-size: 0.80rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.topic-counter {
  font-size: 0.80rem;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* Title */
.topic-title {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

/* Summary */
.topic-summary {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-text);
}

/* Key Points */
.topic-section-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.topic-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.topic-points li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 1rem;
  line-height: 1.55;
}

.topic-points li::before {
  content: "→";
  color: var(--color-accent);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* Stat callout */
.topic-stat {
  background: var(--color-gold-light);
  border-left: 4px solid var(--color-gold);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 18px;
  font-size: 0.97rem;
  line-height: 1.55;
  color: #5a3a00;
}

.topic-stat strong {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-gold);
  margin-bottom: 4px;
}

/* Discussion prompt */
.topic-discussion {
  background: var(--color-accent-light);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.topic-discussion p {
  font-size: 1rem;
  line-height: 1.6;
  color: #0a2e50;
}

.topic-discussion p::before {
  content: "💬 ";
}

/* Card footer row: source ref + used button */
.topic-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 4px;
  border-top: 1px solid var(--color-border);
}

/* Source reference */
.topic-source-ref {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  flex: 1;
  min-width: 0;
}

/* "I Used This" button */
.btn-used {
  background: var(--color-surface);
  color: var(--color-success);
  border: 1.5px solid #a8d5b8;
  font-size: 0.85rem;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  flex-shrink: 0;
}
.btn-used:hover {
  background: #eef7f1;
  border-color: var(--color-success);
}
.btn-used.is-used {
  background: #eef7f1;
  color: var(--color-success);
  border-color: var(--color-success);
  font-weight: 700;
}
.btn-used.is-used:hover {
  background: #d9f0e3;
}
.btn-used:disabled {
  cursor: default;
  opacity: 0.85;
}

/* ---------- Navigation Arrows ---------- */
.topic-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: -6px;
}

.nav-arrow {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all var(--transition);
}
.nav-arrow:hover:not(:disabled) {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
}
.nav-arrow:disabled { opacity: 0.35; cursor: default; }

.nav-label {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* ---------- Share Bar ---------- */
.share-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* ---------- Toast Notification ---------- */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #1a1d23;
  color: #fff;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: 100px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.25);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease;
  white-space: nowrap;
  z-index: 100;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 18px 24px;
  text-align: center;
  font-size: 0.80rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}
.site-footer a { color: var(--color-text-muted); }
.site-footer a:hover { color: var(--color-accent); }

.site-credit {
  margin-top: 6px;
  font-size: 0.75rem;
  opacity: 0.85;
}

/* ---------- Empty / Error State ---------- */
.state-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-muted);
}
.state-empty h2 { font-size: 1.2rem; margin-bottom: 8px; }

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  .topic-card { padding: 24px 20px; }
  .topic-title { font-size: 1.4rem; }
  .topic-summary { font-size: 0.97rem; }
  .hero-headline { font-size: 1.8rem; }
  .hero-sub { font-size: 0.93rem; }
  .hero-row { padding: 24px 20px 32px; }
  .controls { gap: 10px; }
}

/* ---------- Print Styles ---------- */
@media print {
  body { background: #fff; font-size: 11pt; }

  .site-header {
    background: #fff;
    color: #000;
    box-shadow: none;
    border-bottom: 2px solid #000;
  }
  .header-nav-row { padding: 10px 0; }
  .hero-row { display: none; }
  .brand { color: #000; }
  .brand-mark { color: #000; }
  .header-nav-link { display: none; }

  .controls,
  .topic-nav,
  .share-bar,
  .site-footer,
  .btn-used { display: none !important; }

  .topic-card-footer { border-top: 1px solid #ccc; padding-top: 4px; }
  .topic-source-ref  { font-size: 9pt; }

  .container { padding: 20px 0; gap: 16px; }

  .topic-card {
    box-shadow: none;
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 20px 24px;
    gap: 14px;
    break-inside: avoid;
  }

  .topic-title { font-size: 18pt; }
  .topic-summary { font-size: 11pt; }
  .topic-points li { font-size: 10.5pt; }

  .topic-stat {
    border-left: 3px solid #888;
    background: #f9f9f9;
    color: #333;
  }
  .topic-stat strong { color: #555; }

  .topic-discussion {
    background: #f5f5f5;
    border: 1px solid #ddd;
  }
  .topic-discussion p { color: #333; }

  .badge-osha   { border: 1px solid #c0392b; }
  .badge-doe    { border: 1px solid #00508c; }
  .badge-niosh  { border: 1px solid #1a7a4a; }

  .toast { display: none; }
}