:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #687187;
  --primary: #6d4aff;
  --primary-dark: #5534dc;
  --border: #e4e8f0;
  --success: #198754;
  --danger: #c53b48;
  --warning: #ad6a00;
  --shadow: 0 18px 50px rgba(40, 48, 76, 0.08);
}

* { box-sizing: border-box; }
body { margin: 0; font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); }
button, input, select { font: inherit; }
button { cursor: pointer; }
.app-shell { display: grid; grid-template-columns: 250px 1fr; min-height: 100vh; }
.sidebar { background: #15172a; color: #fff; padding: 32px 24px; display: flex; flex-direction: column; justify-content: space-between; position: sticky; top: 0; height: 100vh; }
.brand { font-size: 25px; font-weight: 800; letter-spacing: -0.8px; }
.brand span { color: #9b87ff; }
.brand-copy { color: #aeb3c5; font-size: 14px; line-height: 1.5; }
nav { display: grid; gap: 8px; margin-top: 40px; }
.nav-item { text-align: left; border: 0; background: transparent; color: #b9bdd0; padding: 13px 14px; border-radius: 10px; }
.nav-item:hover, .nav-item.active { background: rgba(255,255,255,0.09); color: white; }
.sidebar-note { font-size: 12px; color: #8f95aa; }
.content { padding: 36px; max-width: 1500px; width: 100%; margin: 0 auto; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 26px; gap: 20px; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: clamp(27px, 4vw, 40px); letter-spacing: -1.5px; }
h2 { margin-bottom: 0; font-size: 19px; }
.eyebrow { color: var(--primary); font-size: 12px; font-weight: 800; letter-spacing: 1.3px; margin-bottom: 8px; }
.grid.two-columns { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(350px, .95fr); gap: 22px; align-items: start; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 24px; box-shadow: var(--shadow); }
.section-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 22px; }
.section-heading > span { color: var(--muted); font-size: 13px; }
.form-card, .settings-card { display: grid; gap: 18px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
label { display: grid; gap: 7px; font-size: 13px; font-weight: 650; color: #374056; }
input[type="text"], input[type="number"], select { width: 100%; border: 1px solid var(--border); background: #fbfcff; border-radius: 10px; padding: 12px 13px; outline: none; color: var(--text); }
input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(109,74,255,.1); }
fieldset { border: 1px solid var(--border); border-radius: 12px; padding: 15px; margin: 0; }
legend { padding: 0 6px; color: var(--muted); font-size: 12px; font-weight: 700; }
.radio-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.radio-card { display: flex; align-items: center; gap: 8px; background: #f8f9fc; padding: 11px; border-radius: 9px; font-size: 12px; }
.primary-button, .secondary-button { border: 0; border-radius: 10px; padding: 12px 16px; font-weight: 750; }
.primary-button { background: var(--primary); color: white; }
.primary-button:hover { background: var(--primary-dark); }
.secondary-button { background: white; border: 1px solid var(--border); color: var(--text); }
.text-button { border: 0; background: transparent; color: var(--danger); }
.results-stack { display: grid; gap: 22px; }
.metric-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.metric-grid article { background: #f8f9fc; border-radius: 12px; padding: 15px; }
.metric-grid span { display: block; font-size: 12px; color: var(--muted); margin-bottom: 7px; }
.metric-grid strong { font-size: 20px; }
.badge { border-radius: 999px; padding: 6px 10px; font-size: 11px !important; font-weight: 800; }
.badge.neutral { background: #edf0f6; color: #596175; }
.badge.good { background: #e5f6ed; color: var(--success); }
.badge.bad { background: #fdebed; color: var(--danger); }
.comparison-box { margin-top: 14px; padding: 13px; border-radius: 10px; background: #f4f1ff; color: #514080; font-size: 13px; }
.scenario-list { display: grid; gap: 10px; }
.scenario { display: grid; grid-template-columns: 1fr auto; gap: 6px 16px; padding: 14px 0; border-bottom: 1px solid var(--border); }
.scenario:last-child { border-bottom: 0; }
.scenario h3 { margin: 0; font-size: 14px; }
.scenario strong { font-size: 16px; }
.scenario small { color: var(--muted); grid-column: 1 / -1; }
.view { display: none; }
.active-view { display: block; }
.hidden { display: none; }
.history-list { display: grid; gap: 12px; }
.history-item { display: grid; grid-template-columns: 1fr auto; gap: 8px 20px; padding: 15px; background: #f8f9fc; border-radius: 12px; }
.history-item strong { display: block; }
.history-item span, .empty-state { color: var(--muted); font-size: 13px; }
.history-price { text-align: right; font-size: 18px; font-weight: 800; }

@media (max-width: 950px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; padding: 18px; }
  .sidebar nav { grid-template-columns: repeat(3, 1fr); margin-top: 18px; }
  .sidebar-note { display: none; }
  .grid.two-columns { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .content { padding: 20px 14px; }
  .topbar { align-items: flex-start; }
  .secondary-button { display: none; }
  .form-grid, .radio-row, .metric-grid { grid-template-columns: 1fr; }
  .card { padding: 18px; border-radius: 14px; }
  .sidebar nav { grid-template-columns: 1fr; }
}
.validation-box { display: grid; gap: 6px; }
.validation-box p, .alert-box { margin: 0; padding: 11px 12px; border-radius: 10px; background: #fff4e1; color: var(--warning); font-size: 13px; font-weight: 650; }
.alert-box { margin-top: 14px; }
.price-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-bottom: 14px; }
.price-cards article { background: #f8f9fc; border: 1px solid var(--border); border-radius: 12px; padding: 14px; }
.price-cards span { display: block; color: var(--muted); font-size: 12px; margin-bottom: 6px; }
.price-cards strong { font-size: 19px; }
.criteria-list { display: grid; gap: 8px; margin-top: 14px; }
.criteria-list p { margin: 0; display: flex; gap: 8px; align-items: center; font-size: 13px; color: var(--muted); }
.criteria-list span { border-radius: 999px; padding: 4px 8px; font-size: 11px; font-weight: 800; }
.criteria-list .ok span { background: #e5f6ed; color: var(--success); }
.criteria-list .fail span { background: #fdebed; color: var(--danger); }
.badge.warning { background: #fff4e1; color: var(--warning); }
.scenario dl { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin: 8px 0 0; }
.scenario div { display: flex; justify-content: space-between; gap: 12px; background: #f8f9fc; padding: 9px 10px; border-radius: 9px; }
.scenario dt { color: var(--muted); font-size: 12px; }
.scenario dd { margin: 0; font-weight: 750; font-size: 12px; text-align: right; }
.comparison-box p { margin: 0; }
.comparison-box p + p { margin-top: 8px; }

@media (max-width: 620px) {
  .price-cards, .scenario dl { grid-template-columns: 1fr; }
}
.login-view { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: radial-gradient(circle at top left, #ebe7ff, #f7f8fc 42%, #fff); }
.login-card { width: min(520px, 100%); background: var(--surface); border: 1px solid var(--border); border-radius: 24px; padding: 34px; box-shadow: var(--shadow); display: grid; gap: 14px; }
.login-card h1 { font-size: clamp(38px, 8vw, 64px); }
.login-card small { color: var(--muted); line-height: 1.5; }
.app-message { margin-bottom: 18px; border-radius: 12px; padding: 12px 14px; font-weight: 700; font-size: 13px; }
.app-message.info { background: #edf0f6; color: #596175; }
.app-message.success { background: #e5f6ed; color: var(--success); }
.app-message.warning { background: #fff4e1; color: var(--warning); }
.app-message.error { background: #fdebed; color: var(--danger); }
.checkbox { display: flex; align-items: center; gap: 10px; background: #f8f9fc; border-radius: 10px; padding: 12px; }
.history-actions { display: flex; gap: 8px; align-items: center; }
.history-actions button { border: 1px solid var(--border); background: #fff; border-radius: 8px; padding: 8px 10px; }
.sidebar a { color: #c9c3ff; font-size: 12px; text-decoration: none; }
h3 { margin: 4px 0 0; font-size: 15px; }
input:focus, select:focus, button:focus-visible { outline: 3px solid rgba(109,74,255,.22); outline-offset: 2px; }
@media (max-width: 620px) { .login-card { padding: 24px; } .history-item, .history-actions { grid-template-columns: 1fr; flex-wrap: wrap; } }
.auth-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; background: #f1f3f8; padding: 6px; border-radius: 12px; }
.auth-tabs button { border: 0; border-radius: 9px; padding: 10px; background: transparent; font-weight: 800; color: var(--muted); }
.auth-tabs button.active { background: #fff; color: var(--primary); box-shadow: 0 6px 18px rgba(40,48,76,.08); }
.auth-form, .confirm-box { display: grid; gap: 14px; }
.password-help { color: var(--muted); font-size: 12px; margin: 0; }
.checkbox a { color: var(--primary); }