/* RaceBook design system, adapted for DLM-Sim.
   Tokens and component classes are copied from RaceBook styles.css (owner's app) so pages can move into
   RaceBook unchanged. Keep class names identical to RaceBook's; put sim-only styles in sim.css. */
:root {
  --bg-primary: #121218; --bg-secondary: #1a1a22; --bg-tertiary: #22222c; --bg-card: #252530;
  --bg-input: #32323f; --bg-hover: #3a3a48; --border-primary: #404052; --border-accent: #505065;
  --text-primary: #ffffff; --text-secondary: #d5d5dd; --text-muted: #a0a0b0;
  --accent-primary: #ff6b35; --accent-secondary: #ff8c5a; --accent-glow: rgba(255, 107, 53, 0.2);
  --success: #4ade80; --warning: #fbbf24; --danger: #ef4444; --warning-text: #eab308;
  --input-border: #505065; --sidebar-width-expanded: 220px; --sidebar-width-collapsed: 56px;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace; --font-body: 'Barlow', -apple-system, sans-serif;
  --font-cond: 'Barlow Condensed', 'Arial Narrow', sans-serif;
  --accent-primary-10: color-mix(in srgb, var(--accent-primary) 10%, transparent);
  --accent-primary-15: color-mix(in srgb, var(--accent-primary) 15%, transparent);
  color-scheme: dark;
}
.light-theme {
  --bg-primary: #f5f5f7; --bg-secondary: #ffffff; --bg-tertiary: #eaeaef; --bg-card: #ffffff;
  --bg-input: #f0f0f5; --bg-hover: #e5e5ea; --border-primary: #d1d1d6; --border-accent: #c0c0c8;
  --text-primary: #1a1a1f; --text-secondary: #505058; --text-muted: #686874;
  --input-border: #c0c0c8; --warning-text: #a16207;
  color-scheme: light;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--font-body); background: var(--bg-primary); color: var(--text-primary); min-height: 100vh; }
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border-accent); border-radius: 3px; }

/* Shell */
.app-layout { display: flex; min-height: 100vh; }
.sidebar { position: fixed; left: 0; top: 0; bottom: 0; width: var(--sidebar-width-expanded); background: var(--bg-secondary);
  border-right: 1px solid var(--border-primary); z-index: 100; display: flex; flex-direction: column; transition: transform .2s; }
.sidebar-header { border-bottom: 1px solid var(--border-primary); display: flex; align-items: center; justify-content: center; height: 56px; overflow: hidden; }
.racebook-logo { height: 140px; width: auto; margin-top: 20px; }
.nav-items { flex: 1; overflow-y: auto; padding: 8px 0; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 10px 12px; margin: 2px 8px; color: var(--text-secondary);
  cursor: pointer; transition: all .2s; border-radius: 6px; font-weight: 500; font-size: 13px; white-space: nowrap; overflow: hidden;
  background: none; border: 0; width: calc(100% - 16px); font-family: var(--font-body); text-align: left; }
.nav-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.nav-item.active { background: var(--accent-glow); color: var(--accent-primary); }
.nav-item svg { width: 18px; height: 18px; flex-shrink: 0; }
.nav-item-label { flex: 1; }
.nav-soon { font-family: var(--font-mono); font-size: 9px; font-weight: 600; text-transform: uppercase; letter-spacing: .5px;
  padding: 2px 6px; border-radius: 10px; background: var(--bg-tertiary); color: var(--text-muted); border: 1px solid var(--border-primary); }
.nav-divider { height: 1px; background: var(--border-primary); margin: 6px 12px; }
.nav-group-label { font-family: var(--font-mono); font-size: 9px; letter-spacing: .8px; text-transform: uppercase; color: var(--text-muted); margin: 10px 20px 2px; }
.sidebar-footer { border-top: 1px solid var(--border-primary); padding: 10px 16px; font-family: var(--font-mono); font-size: 10px; color: var(--text-muted); }
.sidebar-overlay { display: none; }

.main-wrapper { flex: 1; margin-left: var(--sidebar-width-expanded); display: flex; flex-direction: column; min-height: 100vh;
  min-width: 0; max-width: calc(100vw - var(--sidebar-width-expanded)); }
.app-header { background: var(--bg-secondary); border-bottom: 1px solid var(--border-primary); padding: 0 16px; height: 56px;
  display: flex; align-items: center; gap: 16px; position: sticky; top: 0; z-index: 50; }
.app-title { font-family: var(--font-cond); font-weight: 700; font-size: 18px; letter-spacing: .5px; text-transform: uppercase; color: var(--accent-primary); }
.current-context { flex: 1; font-size: 12px; color: var(--text-muted); font-family: var(--font-mono); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.header-actions { display: flex; gap: 8px; align-items: center; }
.header-btn { display: flex; align-items: center; gap: 6px; padding: 6px 12px; background: var(--bg-tertiary); border: 1px solid var(--border-primary);
  border-radius: 6px; color: var(--text-secondary); font-size: 12px; font-family: var(--font-body); cursor: pointer; transition: all .15s ease; }
.header-btn:hover { background: var(--accent-primary); border-color: var(--accent-primary); color: white; }
.header-btn svg { width: 14px; height: 14px; }
.hamburger { display: none; background: none; border: 0; color: var(--text-primary); cursor: pointer; padding: 6px; }
.hamburger svg { width: 22px; height: 22px; }
.car-type-selector { display: flex; align-items: center; gap: 8px; padding-right: 12px; border-right: 1px solid var(--border-primary); }
.car-type-label { font-family: var(--font-cond); font-size: 12px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; white-space: nowrap; }
.car-type-dropdown { background: var(--bg-tertiary); border: 1px solid var(--border-primary); color: var(--text-primary); font-family: var(--font-body);
  font-size: 13px; font-weight: 600; padding: 5px 28px 5px 10px; border-radius: 6px; cursor: pointer; appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 8px center; }
.car-type-dropdown:hover, .car-type-dropdown:focus { outline: none; border-color: var(--accent-primary); }
.main-content { flex: 1; padding: 16px; padding-bottom: 80px; overflow: auto; max-width: 100%; min-width: 0; }

/* Page + cards */
.page-header { margin-bottom: 16px; display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.page-title { font-family: var(--font-cond); font-size: 22px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--text-primary); }
.page-subtitle { font-size: 12px; color: var(--text-muted); margin-top: 2px; max-width: 760px; }
.card { background: var(--bg-card); border: 1px solid var(--border-primary); border-radius: 8px; margin-bottom: 12px; min-width: 0; }
.card-header-static { padding: 8px 12px; border-bottom: 1px solid var(--border-primary); display: flex; align-items: center; justify-content: space-between;
  background: var(--bg-tertiary); border-radius: 8px 8px 0 0; gap: 8px; }
.card-title { font-family: var(--font-cond); font-weight: 600; font-size: 13px; text-transform: uppercase; letter-spacing: .5px; color: var(--accent-primary);
  display: flex; align-items: center; gap: 8px; white-space: nowrap; }
.card-content { padding: 12px; }
.section-subheader { font-family: var(--font-cond); font-size: 12px; text-transform: uppercase; letter-spacing: .5px; color: var(--text-secondary);
  border-bottom: 1px solid var(--border-primary); padding-bottom: 4px; margin: 12px 0 8px; }
.two-column-grid { display: flex; flex-wrap: wrap; gap: 12px; }
.two-column-grid > * { flex: 1 1 400px; }
.three-column-grid { display: flex; flex-wrap: wrap; gap: 12px; }
.three-column-grid > * { flex: 1 1 300px; }

/* Forms */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); gap: 12px; align-items: start; }
.form-group { display: flex; flex-direction: column; gap: 4px; max-width: max-content; width: 100%; position: relative; }
.form-label { font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: .5px; color: var(--text-secondary); font-family: var(--font-mono); }
.form-input { background: var(--bg-input); border: 1px solid var(--input-border); border-radius: 5px; padding: 8px 10px; color: var(--text-primary);
  font-family: var(--font-body); font-size: 13px; transition: all .2s; box-shadow: inset 0 1px 2px rgba(0,0,0,.2); max-width: 300px; width: 100%; }
.form-input:focus { outline: none; border-color: var(--accent-primary); box-shadow: inset 0 1px 2px rgba(0,0,0,.2), 0 0 0 2px var(--accent-glow); }
.form-input::-webkit-outer-spin-button, .form-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.form-input[type="number"] { -moz-appearance: textfield; appearance: textfield; }
.input-wrap { position: relative; }
.input-wrap .form-input { padding-right: 45px; }
.input-unit { position: absolute; right: 10px; top: 50%; transform: translateY(-50%); font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); pointer-events: none; }
.corner-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; max-width: 200px; }
.corner-grid .form-group { position: relative; }
.corner-grid .form-input { text-align: center; padding-top: 14px; }
.corner-label { position: absolute; top: 4px; left: 8px; font-size: 9px; font-weight: 600; color: var(--text-muted); font-family: var(--font-mono); z-index: 1; }
.calculated-value { background: var(--bg-tertiary); border: 1px solid var(--border-primary); border-radius: 5px; padding: 8px 12px;
  font-family: var(--font-mono); font-size: 13px; font-weight: 600; color: var(--accent-primary); }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 10px 16px; border-radius: 6px; font-family: var(--font-body);
  font-weight: 600; font-size: 13px; cursor: pointer; transition: all .2s; border: 1px solid transparent; }
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--accent-primary); color: white; }
.btn-primary:hover { background: var(--accent-secondary); transform: translateY(-1px); }
.btn-primary:disabled { opacity: .6; cursor: progress; transform: none; }
.btn-secondary { background: var(--bg-tertiary); border-color: var(--border-primary); color: var(--text-primary); }
.btn-secondary:hover { background: var(--bg-hover); border-color: var(--border-accent); }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.option-toggle { display: inline-flex; gap: 6px; flex-wrap: wrap; }

/* Toasts */
.toast-stack { position: fixed; right: 16px; bottom: 16px; display: flex; flex-direction: column; gap: 8px; z-index: 200; }
.toast { background: var(--bg-card); border: 1px solid var(--border-primary); border-left: 4px solid var(--accent-primary); border-radius: 6px;
  padding: 10px 14px; font-size: 13px; box-shadow: 0 8px 24px rgba(0,0,0,.35); max-width: 380px; }
.toast.error { border-left-color: var(--danger); }
.toast.success { border-left-color: var(--success); }

/* Mobile: off-canvas sidebar like RaceBook (<=768px) */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.open { display: block; position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 90; }
  .main-wrapper { margin-left: 0; max-width: 100vw; }
  .hamburger { display: block; }
  .header-actions .header-btn span { display: none; }
  .car-type-selector { border-right: 0; padding-right: 0; }
  .car-type-label { display: none; }
}
@media (max-width: 600px) {
  .form-group { max-width: none; }
  .two-column-grid > *, .three-column-grid > * { flex-basis: 100%; }
}