/* Eurokod Lookup — clean, mobile-first UI
   Inspired by glassbosnjace lager / panel.stankovic964 patterns. */

:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-2: #f0f3f9;
  --border: #d8deea;
  --text: #0f172a;
  --text-muted: #64748b;
  --text-faded: #94a3b8;
  --primary: #1e40af;
  --primary-hover: #1e3a8a;
  --primary-soft: #dbeafe;
  --success: #16a34a;
  --success-soft: #dcfce7;
  --warn: #d97706;
  --warn-soft: #fef3c7;
  --error: #dc2626;
  --error-soft: #fee2e2;
  --info: #0891b2;
  --info-soft: #cffafe;
  --shadow: 0 1px 3px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);
  --shadow-lg: 0 4px 6px rgba(15,23,42,.05), 0 10px 15px rgba(15,23,42,.07);
  --radius: 12px;
  --radius-sm: 8px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #131c2e;
    --surface-2: #1a2438;
    --border: #2a3550;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --text-faded: #64748b;
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --primary-soft: #1e3a8a;
    --success-soft: #14532d;
    --warn-soft: #78350f;
    --error-soft: #7f1d1d;
    --info-soft: #155e75;
    --shadow: 0 1px 3px rgba(0,0,0,.4), 0 1px 2px rgba(0,0,0,.3);
    --shadow-lg: 0 4px 6px rgba(0,0,0,.3), 0 10px 15px rgba(0,0,0,.4);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-text-size-adjust: 100%;
}

a {
  color: var(--primary);
  text-decoration: none;
}
a:hover { text-decoration: underline; }
a.link { color: var(--primary); font-weight: 500; }

h1 { font-size: 1.4rem; margin: 0 0 .5rem; letter-spacing: -.02em; }
h2 { font-size: 1.1rem; margin: 0 0 .75rem; letter-spacing: -.01em; }
h3 { font-size: 1rem; margin: 0 0 .5rem; }

.muted { color: var(--text-muted); }
.small { font-size: .85rem; }
.mono  { font-family: var(--mono); font-size: .95em; }
.bold  { font-weight: 700; }
.hint  { color: var(--text-muted); }

/* === Top navigation === */
.topnav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  padding: .65rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  align-items: center;
  gap: .55rem;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
}
.brand:hover { text-decoration: none; }

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--primary);
  color: white;
  font-family: var(--mono);
  font-size: .85rem;
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: .25rem;
  flex-wrap: wrap;
}
.nav-links a {
  padding: .4rem .7rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: .9rem;
  font-weight: 500;
}
.nav-links a:hover {
  background: var(--surface-2);
  color: var(--text);
  text-decoration: none;
}
.nav-links a.active {
  background: var(--primary-soft);
  color: var(--primary);
}

.navtoggle { display: none; }
.hamburger { display: none; }

@media (max-width: 720px) {
  .topnav { padding: .5rem .75rem; }
  .hamburger {
    display: flex;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: .4rem;
  }
  .hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
  }
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    padding-top: .5rem;
  }
  .navtoggle:checked ~ .nav-links { display: flex; }
  .nav-links a { width: 100%; }
}

/* === Main container === */
.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (max-width: 720px) {
  .container { padding: .75rem; gap: .75rem; }
}

/* === Cards === */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.card.hero {
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
}

.card.highlight {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary), var(--shadow);
}

.card.subtle {
  background: var(--surface-2);
}

.card.error {
  border-color: var(--error);
  background: var(--error-soft);
  color: var(--error);
}
.card.error h2 { color: var(--error); }
.card.error a { color: var(--error); text-decoration: underline; }

.card.warn {
  border-color: var(--warn);
  background: var(--warn-soft);
}

@media (max-width: 720px) {
  .card { padding: 1rem; border-radius: 10px; }
}

/* === Forms === */
.vin-form,
.oem-form {
  display: flex;
  gap: .5rem;
  margin-top: 1rem;
}

@media (max-width: 720px) {
  .vin-form, .oem-form { flex-direction: column; }
}

.vin-input {
  flex: 1;
  padding: .75rem 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-family: var(--mono);
  font-size: 1rem;
  letter-spacing: .03em;
  transition: border-color .15s, box-shadow .15s;
}
.vin-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

.btn-primary,
.btn-secondary {
  padding: .75rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, transform .05s;
  font-family: inherit;
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary);
  color: white;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:active { transform: translateY(1px); }

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { background: var(--surface-2); }

/* Entry form (admin.php) */
.entry-form { display: flex; flex-direction: column; gap: 1rem; }
.entry-form label {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  font-size: .9rem;
  color: var(--text-muted);
}
.entry-form label > span { font-weight: 500; }
.entry-form label em { color: var(--error); font-style: normal; }
.entry-form input[type=text],
.entry-form input[type=number],
.entry-form select,
.entry-form textarea {
  padding: .6rem .8rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-family: inherit;
  font-size: .95rem;
}
.entry-form input.mono { font-family: var(--mono); }
.entry-form input:focus,
.entry-form select:focus,
.entry-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 540px) {
  .grid-2 { grid-template-columns: 1fr; }
}

.features-fieldset {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin: 0;
}
.features-fieldset legend { padding: 0 .5rem; font-weight: 500; color: var(--text-muted); }

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: .5rem;
}
.check {
  display: flex !important;
  flex-direction: row !important;
  align-items: center;
  gap: .5rem !important;
  cursor: pointer;
  font-size: .9rem;
  color: var(--text) !important;
}
.check input { cursor: pointer; }
.check.toggle {
  background: var(--surface-2);
  padding: .6rem .8rem;
  border-radius: var(--radius-sm);
}

.form-actions {
  display: flex;
  gap: .5rem;
  margin-top: .5rem;
}

/* === VIN breakdown === */
.vin-breakdown {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem;
  font-family: var(--mono);
  font-size: 1.1rem;
  margin: 1rem 0 .5rem;
}
.vin-part {
  padding: .4rem .55rem;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  cursor: help;
  letter-spacing: .05em;
}
.vin-part.vin-check { background: var(--warn-soft); }
.vin-part.vin-serial { background: var(--info-soft); }

.vin-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .25rem .6rem;
  border-radius: 999px;
  font-size: .8rem;
  font-weight: 500;
  background: var(--surface-2);
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.badge.ok { background: var(--success-soft); color: var(--success); border-color: var(--success); }
.badge.warn { background: var(--warn-soft); color: var(--warn); border-color: var(--warn); }
.badge.error { background: var(--error-soft); color: var(--error); border-color: var(--error); }
.badge.info { background: var(--info-soft); color: var(--info); border-color: var(--info); }
.badge.subtle { background: var(--surface-2); color: var(--text-muted); }
.badge.action {
  cursor: pointer;
  border-color: var(--border);
}
.badge.action:hover { background: var(--primary-soft); color: var(--primary); }

/* === Tables === */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}
.table th, .table td {
  padding: .55rem .65rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.table th {
  background: var(--surface-2);
  font-weight: 600;
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-muted);
}
.table tbody tr:hover { background: var(--surface-2); }

@media (max-width: 720px) {
  .table { font-size: .82rem; }
  .table th, .table td { padding: .45rem .5rem; }
}

/* === Catalog buttons === */
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: .65rem;
  margin: 1rem 0;
}
.catalog-btn {
  display: flex;
  flex-direction: column;
  gap: .15rem;
  padding: .8rem 1rem;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  position: relative;
  transition: border-color .15s, transform .05s, box-shadow .15s;
}
.catalog-btn:hover {
  text-decoration: none;
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}
.catalog-btn:active { transform: translateY(1px); }

.catalog-name { font-weight: 600; }
.catalog-note { font-size: .8rem; color: var(--text-muted); }
.catalog-arrow {
  position: absolute;
  top: .8rem;
  right: 1rem;
  color: var(--text-faded);
  font-size: 1rem;
}

/* === Eurocode breakdown === */
.eurocode-breakdown {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem;
  font-family: var(--mono);
  font-size: 1.4rem;
  font-weight: 700;
  margin: 1rem 0;
}
.ec-part {
  padding: .4rem .6rem;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
}
.ec-part.base { background: var(--primary-soft); color: var(--primary); }
.ec-part.pos { background: var(--info-soft); color: var(--info); }
.ec-part.feat { background: var(--success-soft); color: var(--success); }
.ec-part.unknown { background: var(--error-soft); color: var(--error); }

.eurocode-pill {
  display: inline-block;
  padding: .3rem .7rem;
  background: var(--primary-soft);
  color: var(--primary);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1.05rem;
}

.eurocode-result {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-top: 1rem;
  background: var(--surface-2);
}
.eurocode-result header {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  align-items: center;
  margin-bottom: .75rem;
}

/* === Key-value === */
.kv {
  display: grid;
  grid-template-columns: minmax(120px, 200px) 1fr;
  gap: .35rem 1rem;
  margin: .5rem 0;
}
.kv dt {
  font-weight: 500;
  color: var(--text-muted);
  font-size: .88rem;
}
.kv dd {
  margin: 0;
  color: var(--text);
}

@media (max-width: 540px) {
  .kv { grid-template-columns: 1fr; gap: 0 0; }
  .kv dt { margin-top: .5rem; font-size: .8rem; }
}

/* === Feature list === */
.feature-list,
.legend-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: .35rem;
}
.feature-list li,
.legend-list li {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .9rem;
}

/* === Tabs === */
.tabs {
  display: flex;
  gap: .25rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}
.tabs a {
  padding: .5rem 1rem;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-weight: 500;
  font-size: .9rem;
}
.tabs a:hover { color: var(--text); text-decoration: none; }
.tabs a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* === Stats === */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: .75rem;
  margin-top: 1rem;
}
.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  text-align: center;
}
.stat strong {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}
.stat span {
  font-size: .8rem;
  color: var(--text-muted);
  margin-top: .25rem;
}

/* === Flash messages === */
.flash {
  padding: .75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid;
  font-weight: 500;
}
.flash.success {
  background: var(--success-soft);
  color: var(--success);
  border-color: var(--success);
}

/* === Footer === */
.footer {
  text-align: center;
  padding: 1.5rem 1rem;
  color: var(--text-faded);
  font-size: .8rem;
}

/* === Details/summary === */
details {
  margin-top: .75rem;
}
details summary {
  cursor: pointer;
  padding: .35rem 0;
  font-weight: 500;
  color: var(--text-muted);
  font-size: .9rem;
}
details[open] summary { color: var(--text); }
details ul { margin-top: .5rem; }