:root {
  --bg: #0f0f12; --surface: #1a1a22; --surface2: #22222e; --surface3: #2a2a38;
  --border: #2e2e3e; --text: #e8e8f0; --text-dim: #8888a0; --text-muted: #55556a;
  --accent: #ff4455; --accent-glow: rgba(255, 68, 85, 0.15); --accent2: #00d4aa;
  --danger: #ff5566; --success: #00d4aa; --radius: 12px; --radius-sm: 8px;
  --radius-lg: 16px; --shadow: 0 4px 24px rgba(0,0,0,0.3);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'DM Sans', sans-serif; background: var(--bg); color: var(--text);
  min-height: 100vh; overflow-x: hidden;
}
body::before {
  content: ''; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse 80% 50% at 20% 0%, rgba(255,68,85,0.06) 0%, transparent 60%),
              radial-gradient(ellipse 60% 40% at 80% 100%, rgba(0,212,170,0.04) 0%, transparent 60%);
  pointer-events: none; z-index: 0;
}
.app { position: relative; z-index: 1; }
header {
  padding: 24px 40px; display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--border); backdrop-filter: blur(20px);
  position: sticky; top: 0; z-index: 100; background: rgba(15,15,18,0.85);
}
.logo { display: flex; align-items: center; gap: 14px; }
.logo-icon {
  width: 40px; height: 40px; background: linear-gradient(135deg, #ff4455, #ff8833);
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 700; color: #fff; box-shadow: 0 2px 16px rgba(255,68,85,0.3);
}
.logo h1 { font-family: 'Outfit', sans-serif; font-size: 26px; font-weight: 400; letter-spacing: -0.5px; }
.logo h1 span { color: var(--accent); }
nav { display: flex; gap: 6px; }
nav button {
  padding: 10px 20px; border: 1px solid var(--border); background: transparent;
  color: var(--text-dim); border-radius: var(--radius); cursor: pointer;
  font-family: inherit; font-size: 14px; font-weight: 500; transition: all 0.2s;
}
nav button:hover { border-color: var(--text-dim); color: var(--text); }
nav button.active { background: var(--accent); border-color: var(--accent); color: #fff; box-shadow: 0 2px 12px rgba(255,68,85,0.3); }
main { max-width: 1400px; margin: 0 auto; padding: 32px 40px; }
.page { display: none; }
.page.active { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.section-title {
  font-family: 'Outfit', sans-serif; font-size: 22px; margin-bottom: 20px;
  display: flex; align-items: center; gap: 12px;
}
.section-title .badge {
  font-family: 'DM Sans', sans-serif; font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 1px; padding: 4px 10px;
  border-radius: 20px; background: var(--accent-glow); color: var(--accent);
  border: 1px solid rgba(255,68,85,0.2);
}
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px; margin-bottom: 24px;
  transition: border-color 0.2s;
}
.card:hover { border-color: var(--surface3); }
.client-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label {
  font-size: 12px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.8px; color: var(--text-dim);
}
.form-group input, .form-group select {
  padding: 11px 14px; background: var(--surface2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text); font-family: inherit;
  font-size: 14px; transition: all 0.2s; outline: none;
}
.form-group input:focus, .form-group select:focus {
  border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-group input::placeholder { color: var(--text-muted); }
.form-group input[list] {
  cursor: text;
}
.form-group input[list]::-webkit-calendar-picker-indicator {
  opacity: 0.6;
  cursor: pointer;
}
.monte-toggle-container {
  display: flex; gap: 12px; margin: 24px 0; background: var(--surface);
  padding: 20px 28px; border-radius: var(--radius-lg); border: 1px solid var(--border);
}
.monte-option {
  flex: 1; padding: 14px 24px; background: var(--surface2);
  border: 2px solid var(--border); border-radius: var(--radius);
  cursor: pointer; transition: all 0.2s; text-align: center;
  font-weight: 600; user-select: none;
}
.monte-option:hover { border-color: var(--surface3); transform: translateY(-1px); }
.monte-option.active {
  background: var(--accent); border-color: var(--accent); color: #fff;
  box-shadow: 0 4px 16px rgba(255,68,85,0.3);
}
.monte-option .label { font-size: 15px; margin-bottom: 4px; }
.monte-option .sublabel { font-size: 11px; opacity: 0.7; text-transform: uppercase; letter-spacing: 0.5px; }
.tires-grid { display: grid; gap: 16px; margin-bottom: 24px; }
.tires-grid.mode-simple { grid-template-columns: repeat(4, 1fr); }
.tires-grid.mode-mixte { display: flex; flex-direction: column; gap: 24px; }
.offer-group {
  background: var(--surface); border: 2px solid var(--accent);
  border-radius: var(--radius-lg); padding: 24px;
  display: flex; flex-direction: column; gap: 16px;
  box-shadow: 0 4px 20px rgba(255,68,85,0.1);
}
.offer-group-header {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 16px; border-bottom: 2px solid var(--border);
}
.offer-group-title {
  font-family: 'Outfit', sans-serif; font-size: 20px; font-weight: 700;
  color: var(--accent); display: flex; align-items: center; gap: 10px;
}
.offer-group-badge {
  font-size: 11px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 1px; padding: 4px 10px; border-radius: 20px;
  background: var(--accent-glow); color: var(--accent);
  border: 1px solid rgba(255,68,85,0.2);
}
.offer-group-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.offer-group-total {
  padding-top: 16px; border-top: 2px solid var(--border);
  display: flex; justify-content: flex-end; align-items: center; gap: 16px;
}
.offer-group-total-label {
  font-size: 14px; font-weight: 600; text-transform: uppercase;
  color: var(--text-dim); letter-spacing: 0.8px;
}
.offer-group-total-value { font-size: 28px; font-weight: 700; color: var(--accent2); }
.tire-card {
  background: var(--surface2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; transition: all 0.25s;
}
.tire-card:hover { border-color: var(--surface3); transform: translateY(-1px); }
.tire-card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border);
}
.tire-number {
  font-size: 13px; font-weight: 700; color: var(--accent);
  background: var(--accent-glow); padding: 6px 12px; border-radius: 8px;
}
.tire-card .form-group { margin-bottom: 12px; }
.tire-card .form-group:last-child { margin-bottom: 0; }
.tire-card input[type="number"] { width: 100%; -moz-appearance: textfield; }
.tire-card input[type="number"]::-webkit-inner-spin-button,
.tire-card input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; }
.computed-value {
  padding: 10px 14px; background: rgba(0,212,170,0.06);
  border: 1px solid rgba(0,212,170,0.15); border-radius: var(--radius-sm);
  color: var(--accent2); font-weight: 600; font-size: 14px; font-variant-numeric: tabular-nums;
}
.offer-total {
  margin-top: 16px; padding-top: 16px; border-top: 2px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
}
.offer-total-label {
  font-size: 12px; font-weight: 600; text-transform: uppercase;
  color: var(--text-dim); letter-spacing: 0.8px;
}
.offer-total-value { font-size: 18px; font-weight: 700; color: var(--accent2); }
.toggle-container {
  display: flex; align-items: center; gap: 14px; margin: 28px 0 20px;
  cursor: pointer; user-select: none;
}
.toggle-track {
  width: 48px; height: 26px; background: var(--surface3); border-radius: 13px;
  position: relative; transition: background 0.25s; border: 1px solid var(--border); flex-shrink: 0;
}
.toggle-track.active { background: var(--accent); border-color: var(--accent); }
.toggle-thumb {
  width: 20px; height: 20px; background: #fff; border-radius: 50%;
  position: absolute; top: 2px; left: 3px; transition: transform 0.25s;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}
.toggle-track.active .toggle-thumb { transform: translateX(21px); }
.toggle-label { font-size: 14px; font-weight: 600; color: var(--text); }
.jantes-section {
  max-height: 0; overflow: hidden; opacity: 0;
  transition: all 0.4s ease; margin-bottom: 0;
}
.jantes-section.visible { max-height: 2000px; opacity: 1; margin-bottom: 24px; }
.tva-selector { display: flex; align-items: center; gap: 16px; }
.tva-selector label { font-size: 14px; font-weight: 600; color: var(--text); }
.tva-selector input {
  width: 100px; padding: 10px 14px; background: var(--surface2);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); font-size: 14px; font-weight: 600;
}
.actions { display: flex; gap: 12px; justify-content: flex-end; margin-top: 32px; }
.btn {
  padding: 14px 28px; border: none; border-radius: var(--radius);
  font-family: inherit; font-size: 14px; font-weight: 600;
  cursor: pointer; transition: all 0.2s; display: flex; align-items: center; gap: 8px;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 2px 12px rgba(255,68,85,0.3); }
.btn-primary:hover { background: #ff5566; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(255,68,85,0.4); }
.btn-secondary { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--surface3); border-color: var(--surface3); }
.btn-success { background: var(--success); color: #fff; box-shadow: 0 2px 12px rgba(0,212,170,0.3); }
.btn-success:hover { background: #00e6bc; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(0,212,170,0.4); }
.btn-danger { background: var(--danger); color: #fff; box-shadow: 0 2px 12px rgba(255,85,102,0.3); }
.btn-danger:hover { background: #ff6677; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(255,85,102,0.4); }
.toast {
  position: fixed; bottom: 32px; right: 32px; background: var(--surface);
  border: 1px solid var(--accent2); color: var(--accent2); padding: 16px 24px;
  border-radius: var(--radius); box-shadow: var(--shadow); opacity: 0; transform: translateY(20px);
  transition: all 0.3s; z-index: 1000; font-weight: 600;
}
.toast.show { opacity: 1; transform: translateY(0); }
.history-grid { display: grid; gap: 16px; }
.history-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 24px; cursor: pointer;
  transition: all 0.2s; display: grid; grid-template-columns: auto 1fr auto;
  gap: 20px; align-items: center;
}
.history-card:hover { border-color: var(--surface3); transform: translateY(-2px); box-shadow: 0 4px 20px rgba(0,0,0,0.2); }
.history-number { font-size: 32px; font-weight: 700; color: var(--accent); font-family: 'Outfit', monospace; }
.history-info { display: flex; flex-direction: column; gap: 6px; }
.history-name { font-size: 18px; font-weight: 600; color: var(--text); }
.history-meta { font-size: 13px; color: var(--text-dim); }
.history-total { font-size: 24px; font-weight: 700; color: var(--accent2); text-align: right; }
.empty-state { text-align: center; padding: 80px 40px; color: var(--text-dim); }
.empty-state-icon { font-size: 64px; margin-bottom: 16px; opacity: 0.3; }
.modal-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.8); backdrop-filter: blur(8px); z-index: 1000;
  display: none; align-items: center; justify-content: center; padding: 40px;
}
.modal-overlay.active { display: flex; animation: fadeIn 0.3s ease; }
.modal {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); max-width: 900px; width: 100%;
  max-height: 90vh; overflow-y: auto; box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.modal-header {
  padding: 28px 32px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.modal-title { font-family: 'Outfit', sans-serif; font-size: 24px; font-weight: 600; }
.modal-close {
  width: 32px; height: 32px; border: none; background: var(--surface2);
  color: var(--text); border-radius: 8px; cursor: pointer; font-size: 18px; transition: all 0.2s;
}
.modal-close:hover { background: var(--surface3); transform: rotate(90deg); }
.modal-body { padding: 32px; }
.detail-section { margin-bottom: 32px; }
.detail-section:last-child { margin-bottom: 0; }
.detail-section-title {
  font-size: 14px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 1px; color: var(--text-dim); margin-bottom: 16px;
}
.detail-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.detail-item { display: flex; flex-direction: column; gap: 4px; }
.detail-item .dl {
  font-size: 11px; color: var(--text-dim); text-transform: uppercase;
  letter-spacing: 0.5px; margin-bottom: 2px;
}
.detail-item .dv { font-size: 15px; font-weight: 600; }
.modal-actions {
  padding: 24px 32px; border-top: 1px solid var(--border);
  display: flex; gap: 12px; justify-content: flex-end;
}