:root {
  --ink: #111111;
  --paper: #f7f7f4;
  --white: #ffffff;
  --acid: #ff4d00;
  --red: #d92d20;
  --orange: #ff4d00;
  --blue: #2457d6;
  --muted: #626262;
  --line: #deded8;
  --field-border: #a1a1aa;
  --field-background: #f8fafc;
  --shadow: 0 12px 32px rgba(17, 17, 17, 0.07);
  --radius: 16px;
  --bg: var(--paper);
  --surface: var(--white);
  --panel: #f1f1ec;
  --border: var(--line);
  --text: var(--ink);
  --accent: var(--orange);
  --accent-soft: #fff0e8;
  --cta-bg: var(--orange);
  --cta-soft: #fff0e8;
  --danger: #b91c1c;
  --success: #166534;
  --warning: #b45309;
}

* { box-sizing: border-box; }

html, body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
}

body {
  background: var(--paper);
  font-size: 16px;
  line-height: 1.5;
}

.page {
  max-width: 1320px;
}

.header-inner,
.topbar,
.header:not(:has(.header-inner)) {
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: none;
}

.header-inner,
.topbar {
  min-height: 64px;
}

.header .logo,
.header-inner .logo,
.brand {
  color: var(--ink);
  font-size: 1.55rem;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1.2;
  display: inline-flex;
  align-items: baseline;
  gap: 0;
  white-space: nowrap;
  text-decoration: none;
}

.logo span,
.brand span {
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  letter-spacing: inherit;
  line-height: inherit;
}

.brand-main,
.header .brand-main { color: var(--orange); }
.brand-dot { color: var(--ink); }
.brand-store { color: var(--muted); }

.card,
.panel,
.form-container,
.book-card,
.category-card,
.sidebar,
.hero-copy,
.hero-image {
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.header .nav a,
.header .nav button,
.header-inner .nav a,
.header-inner .nav button,
.topbar .nav a,
.topbar .nav button,
.nav .nav-button,
.nav .post-btn,
.nav .sell,
.nav .logout {
  min-height: 42px;
  padding: 0.65rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--white);
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

.nav .post-btn,
.nav .sell,
.nav .nav-button.login,
.primary-btn,
.btn.primary,
button.primary,
.account-dialog-submit {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.header-inner .nav a.post-btn,
.header-inner .nav a.sell {
  background-color: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.header-inner .nav a.post-btn:hover,
.header-inner .nav a.sell:hover {
  background-color: #e44300;
  border-color: #e44300;
  color: var(--white);
}

.book-card .btn.primary {
  background-color: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.nav a:hover,
.nav button:hover,
.btn:hover,
button.primary:hover,
.primary-btn:hover,
.secondary-btn:hover,
.category-card:hover {
  filter: brightness(0.94);
}

.primary-btn,
.btn.primary,
button.primary,
.account-dialog-submit,
.nav .post-btn,
.nav .sell,
.nav .nav-button.login {
  font-weight: 800;
  transition: transform 0.18s ease, filter 0.18s ease;
}

.primary-btn:hover,
.btn.primary:hover,
button.primary:hover,
.account-dialog-submit:hover,
.nav .post-btn:hover,
.nav .sell:hover,
.nav .nav-button.login:hover {
  transform: translateY(-1px);
}

input:not([type="checkbox"]):not([type="radio"]):not([type="file"]),
select,
textarea {
  min-height: 44px;
  border: 1px solid var(--field-border);
  border-radius: 10px;
  background-color: var(--field-background);
  color: var(--ink);
  font: inherit;
  box-shadow: inset 0 1px 2px rgba(17, 17, 17, 0.06);
}

input:not([type="checkbox"]):not([type="radio"]):not([type="file"]):hover,
select:hover,
textarea:hover {
  border-color: #73737c;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--orange);
  outline: 3px solid rgba(255, 77, 0, 0.18);
}

.btn,
.btn.primary,
.btn.secondary,
.btn.ghost,
.button-small,
.reset-btn,
.scan-btn,
.ai-btn,
.account-dialog button,
.account-dialog input,
.primary-btn,
.secondary-btn,
button.primary {
  border-radius: 10px;
  font: inherit;
  font-weight: 700;
}

.stat,
.tag,
.chip,
.category-icon,
.action-list a,
.status-box {
  border-radius: 12px;
}

.tag {
  background-color: var(--accent-soft);
  color: #81420f;
}

.muted,
.book-author,
.meta-label {
  color: var(--muted);
}

@media (max-width: 720px) {
  .page { max-width: 100%; }
  .topbar { border-radius: var(--radius); }
}