/* B2Bid neutral design tokens.
   Deliberately not the KVS corporate palette — B2Bid is a neutral
   marketplace brand, not a KVS-branded sales channel (D-01/D-03, see also
   01-RESEARCH.md's KVS design-token pattern excerpt: structure reused,
   palette replaced). */
:root {
  --color-ink: #0f172a; /* primary text */
  --color-ink-soft: #334155; /* secondary text */
  --color-surface: #ffffff;
  --color-surface-muted: #f1f5f9;
  --color-border: #cbd5e1;
  --color-accent: #0e7490; /* deep teal — single cool accent */
  --color-accent-dark: #0b5a70;
  --color-accent-contrast: #ffffff;
  --color-danger: #b91c1c;
  --color-success: #15803d;

  --font-ui: "Anuphan", "Noto Sans Thai", "Sarabun", "Leelawadee UI", Tahoma, "Segoe UI", sans-serif;

  --radius-sm: 4px;
  --radius-md: 8px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 40px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-ui);
  color: var(--color-ink);
  background: var(--color-surface-muted);
  line-height: 1.6;
}

a {
  color: var(--color-accent);
}

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header__brand {
  font-weight: 700;
  font-size: 20px;
  color: var(--color-ink);
  letter-spacing: 0.01em;
}

.site-header__nav {
  display: flex;
  gap: var(--space-3);
  font-size: 14px;
}

.site-header__nav a {
  color: var(--color-ink-soft);
  text-decoration: none;
}

.site-header__nav a:hover {
  color: var(--color-accent);
}

.app-mount {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-4);
  min-height: 60vh;
}

.site-footer {
  text-align: center;
  padding: var(--space-4);
  color: var(--color-ink-soft);
  font-size: 13px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  max-width: 420px;
  margin: 0 auto;
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

.field label {
  font-size: 14px;
  color: var(--color-ink-soft);
}

.field input {
  font-family: var(--font-ui);
  font-size: 16px;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.field-error {
  color: var(--color-danger);
  font-size: 13px;
}

.btn {
  font-family: var(--font-ui);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent-contrast);
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-4);
  cursor: pointer;
}

.btn:hover {
  background: var(--color-accent-dark);
}

.empty-state {
  text-align: center;
  color: var(--color-ink-soft);
  padding: var(--space-5) 0;
}