:root {
  --window-bg: #F1F5F9;
  --surface: #FFFFFF;
  --surface-variant: #E2E8F0;
  --surface-border: #94A3B8;
  --primary: #0256B4;
  --primary-hover: #01428D;
  --text: #0F172A;
  --muted-text: #475569;
  --accent: #0284C7;
  --success: #0B7A45;
  --warning: #C2410C;
  --danger: #B91C1C;
  --radius: 8px;
  --shadow: 0 4px 12px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; }
body { background: var(--window-bg); color: var(--text); line-height: 1.5; min-height: 100vh; display: flex; flex-direction: column; }
.container { width: 100%; max-width: 1040px; margin: 0 auto; padding: 0 16px; }

/* Header */
.app-header { background: var(--surface); border-bottom: 1px solid var(--surface-border); padding: 12px 0; }
.header-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo { border-radius: 6px; }
.brand-title { font-size: 1.25rem; color: var(--primary); font-weight: 700; line-height: 1.2; }
.brand-subtitle { font-size: 0.78rem; color: var(--muted-text); }
.accent-text { color: var(--accent); }

/* Navigation Tabs */
.nav-tabs { display: flex; gap: 8px; }
.tab-btn { background: var(--surface-variant); border: 1px solid var(--surface-border); padding: 8px 16px; border-radius: 6px; font-weight: 600; font-size: 0.9rem; cursor: pointer; color: var(--text); transition: all 0.2s; }
.tab-btn.active { background: var(--primary); color: #FFF; border-color: var(--primary); }

/* Views */
.view-panel { display: none; padding: 24px 0 40px; }
.view-panel.active { display: block; }

/* Hero */
.hero-card { background: var(--surface); border: 1px solid var(--surface-border); border-radius: var(--radius); padding: 28px 24px; box-shadow: var(--shadow); margin-bottom: 24px; text-align: center; }
.hero-card h2 { color: var(--primary); font-size: 1.5rem; margin-bottom: 6px; }
.hero-card p { color: var(--muted-text); font-size: 0.95rem; margin-bottom: 20px; }
.search-form { max-width: 540px; margin: 0 auto; }
.input-wrapper { display: flex; gap: 8px; }
.input-wrapper input { flex: 1; padding: 12px 16px; border: 1px solid var(--surface-border); border-radius: 6px; font-size: 1rem; text-transform: uppercase; font-weight: 600; outline: none; }
.input-wrapper input:focus { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(2, 86, 180, 0.2); }
.input-wrapper button, .calc-btn { background: var(--primary); color: #FFF; border: none; padding: 12px 24px; border-radius: 6px; font-weight: 600; font-size: 1rem; cursor: pointer; transition: background 0.2s; }
.input-wrapper button:hover, .calc-btn:hover { background: var(--primary-hover); }

/* Cards & Timeline */
.card { background: var(--surface); border: 1px solid var(--surface-border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.result-header { display: flex; justify-content: space-between; align-items: flex-start; border-bottom: 1px solid var(--surface-variant); padding-bottom: 16px; margin-bottom: 24px; flex-wrap: wrap; gap: 12px; }
.ticket-id { font-family: monospace; font-size: 0.9rem; background: var(--surface-variant); padding: 4px 8px; border-radius: 4px; color: var(--primary); font-weight: bold; }
.device-model { font-size: 1.3rem; color: var(--text); margin-top: 6px; }
.customer-name { font-size: 0.85rem; color: var(--muted-text); }
.badge { padding: 6px 12px; border-radius: 20px; font-size: 0.85rem; font-weight: 700; color: #FFF; background: var(--primary); display: inline-block; }
.badge-outline { background: transparent; border: 1px solid var(--surface-border); color: var(--text); margin-left: 6px; }

.timeline-container { display: flex; justify-content: space-between; position: relative; margin: 36px 0; padding: 0 10px; }
.timeline-container::before { content: ''; position: absolute; top: 16px; left: 24px; right: 24px; height: 4px; background: var(--surface-variant); z-index: 1; }
.timeline-step { position: relative; z-index: 2; text-align: center; flex: 1; }
.step-circle { width: 34px; height: 34px; border-radius: 50%; background: var(--surface); border: 3px solid var(--surface-border); display: flex; align-items: center; justify-content: center; margin: 0 auto 8px; font-weight: bold; font-size: 0.85rem; color: var(--muted-text); transition: all 0.3s; }
.timeline-step.completed .step-circle { background: var(--success); border-color: var(--success); color: #FFF; }
.timeline-step.active .step-circle { background: var(--primary); border-color: var(--primary); color: #FFF; box-shadow: 0 0 0 4px rgba(2, 86, 180, 0.25); }
.step-label { font-size: 0.78rem; font-weight: 600; color: var(--muted-text); }
.timeline-step.active .step-label { color: var(--primary); font-weight: 700; }

.details-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; background: var(--window-bg); padding: 16px; border-radius: 6px; margin-bottom: 24px; }
.info-block label { font-size: 0.78rem; text-transform: uppercase; color: var(--muted-text); font-weight: bold; }
.info-block p { font-size: 1.05rem; font-weight: 600; color: var(--text); }
.price-text { color: var(--primary) !important; }
.balance-text { color: var(--warning) !important; font-size: 1.15rem !important; font-weight: 700 !important; }

/* Estimator */
.estimator-layout { display: grid; grid-template-columns: 1fr 1.2fr; gap: 24px; }
.estimator-controls { display: flex; flex-direction: column; gap: 12px; background: var(--surface); padding: 24px; border-radius: var(--radius); border: 1px solid var(--surface-border); }
.estimator-controls label { font-size: 0.85rem; font-weight: 700; color: var(--text); }
.estimator-controls select { padding: 10px; border-radius: 6px; border: 1px solid var(--surface-border); font-size: 0.95rem; }
.estimate-result-card { background: var(--surface); border: 2px solid var(--primary); border-radius: var(--radius); padding: 28px 24px; text-align: center; display: flex; flex-direction: column; justify-content: center; }
.estimate-number { font-size: 2.2rem; font-weight: 800; color: var(--success); margin: 12px 0; }
.turnaround-text { font-weight: 600; color: var(--muted-text); margin-bottom: 12px; }
.disclaimer-note { font-size: 0.8rem; color: var(--muted-text); line-height: 1.4; border-top: 1px solid var(--surface-variant); padding-top: 12px; }

/* Audit List & Utilities */
.audit-list { list-style: none; margin-top: 12px; border-top: 1px solid var(--surface-variant); padding-top: 12px; }
.audit-list li { font-size: 0.88rem; padding: 6px 0; border-bottom: 1px dashed var(--surface-variant); display: flex; justify-content: space-between; }
.hidden { display: none !important; }
.alert { padding: 12px 16px; border-radius: 6px; margin-bottom: 16px; font-weight: 600; font-size: 0.9rem; }
.alert-error { background: #FEE2E2; color: var(--danger); border: 1px solid #FCA5A5; }
.loading-spinner { text-align: center; padding: 40px 0; }
.spinner { width: 36px; height: 36px; border: 4px solid var(--surface-variant); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.8s linear infinite; margin: 0 auto 12px; }
@keyframes spin { to { transform: rotate(360deg); } }

.app-footer { margin-top: auto; background: var(--surface); border-top: 1px solid var(--surface-border); padding: 20px 0; text-align: center; font-size: 0.8rem; color: var(--muted-text); }

@media (max-width: 768px) {
  .estimator-layout { grid-template-columns: 1fr; }
  .timeline-container { overflow-x: auto; padding-bottom: 12px; }
  .input-wrapper { flex-direction: column; }
}