*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; overflow: hidden; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  background: var(--tg-theme-bg-color, #F1F5F9);
  color: var(--tg-theme-text-color, #0F172A);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --primary: #0B2545;
  --primary-hover: #13315C;
  --accent: #FBBF24;
  --accent-dark: #F59E0B;
  --success: #10B981;
  --bg: #FFFFFF;
  --bg-alt: #F1F5F9;
  --bg-soft: #F8FAFC;
  --ink: #0F172A;
  --ink-dim: #475569;
  --ink-mute: #94A3B8;
  --border: #E2E8F0;
  --border-soft: #EEF1F5;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(15,23,42,0.04);
  --shadow: 0 4px 12px rgba(15,23,42,0.08);
  --shadow-lg: 0 12px 28px -8px rgba(15,23,42,0.16);
}

#app {
  width: 100%;
  height: 100vh;
  height: 100dvh;
  max-width: 480px;
  margin: 0 auto;
  position: relative;
  background: var(--bg-alt);
}

/* ===== Screen ===== */
.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg-alt);
  animation: screenIn 0.25s ease-out;
}
.screen[hidden] { display: none !important; }
@keyframes screenIn {
  from { opacity: 0; transform: translateX(12px); }
  to { opacity: 1; transform: translateX(0); }
}
.screen__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px 8px;
  background: var(--bg-alt);
}
.back-btn {
  width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--ink);
  cursor: pointer;
  transition: all 0.15s;
}
.back-btn:active { transform: scale(0.94); }
.back-btn svg { width: 18px; height: 18px; }

.screen__progress {
  display: flex; gap: 6px;
}
.progress-dot {
  width: 28px; height: 4px; border-radius: 2px;
  background: var(--border);
  transition: background 0.2s;
}
.progress-dot--active { background: var(--primary); }

.screen__body {
  flex: 1;
  padding: 20px 20px 12px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.screen__title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 6px;
}
.screen__sub {
  color: var(--ink-dim);
  font-size: 0.95rem;
  margin-bottom: 24px;
}
.screen__footer {
  padding: 16px 20px calc(20px + env(safe-area-inset-bottom));
  background: var(--bg-alt);
  border-top: 1px solid var(--border-soft);
}
.screen__footer--split { display: flex; gap: 10px; }
.screen__footer--split .btn { flex: 1; }

/* ===== Welcome ===== */
.screen--welcome {
  padding: 40px 24px calc(24px + env(safe-area-inset-bottom));
  justify-content: space-between;
  background: linear-gradient(180deg, #FFF7ED 0%, #F1F5F9 45%, #F1F5F9 100%);
}
.welcome__hero {
  text-align: center;
  padding-top: 40px;
}
.welcome__logo {
  width: 96px; height: 96px;
  margin: 0 auto 20px;
  background: #FEF3C7;
  border-radius: 28px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 10px 28px -4px rgba(251,191,36,0.35);
}
.welcome__hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}
.welcome__sub {
  color: var(--ink-dim);
  font-size: 1rem;
  max-width: 300px;
  margin: 0 auto;
}
.welcome__features {
  display: flex; flex-direction: column; gap: 12px;
}
.feature {
  display: flex; align-items: center; gap: 14px;
  background: var(--bg);
  padding: 14px 16px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.feature__icon {
  width: 40px; height: 40px;
  background: var(--bg-alt);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.feature__text {
  font-size: 0.9rem;
  color: var(--ink);
  font-weight: 500;
}
.welcome__footer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--ink-mute);
  margin-top: 12px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: none;
  border-radius: 12px;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}
.btn--primary {
  background: var(--primary);
  color: #fff;
}
.btn--primary:active {
  background: var(--primary-hover);
  transform: scale(0.98);
}
.btn--outline {
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--border);
}
.btn--outline:active { background: var(--bg-alt); transform: scale(0.98); }
.btn--lg { padding: 16px 22px; font-size: 1rem; }
.btn--full { width: 100%; }

/* ===== Forms ===== */
.form-group { margin-bottom: 22px; }
.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-dim);
  margin-bottom: 8px;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}
.form-input, .form-select {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-family: inherit;
  font-size: 1rem;
  color: var(--ink);
  transition: all 0.15s;
}
.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(11,37,69,0.1);
}
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394A3B8' stroke-width='2.5'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 44px;
}
.form-hint {
  margin-top: 6px;
  font-size: 0.8rem;
  color: var(--ink-mute);
}
.input-with-suffix {
  position: relative;
}
.input-with-suffix .form-input {
  padding-right: 110px;
}
.input-suffix {
  position: absolute;
  right: 16px; top: 50%;
  transform: translateY(-50%);
  color: var(--ink-mute);
  font-size: 0.88rem;
  font-weight: 500;
  pointer-events: none;
}

/* ===== Choice grid ===== */
.choice-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.choice {
  position: relative;
  cursor: pointer;
}
.choice input { position: absolute; opacity: 0; }
.choice__content {
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 14px 12px;
  text-align: center;
  transition: all 0.15s;
}
.choice__icon {
  font-size: 28px;
  margin-bottom: 6px;
}
.choice__title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.25;
}
.choice input:checked + .choice__content {
  border-color: var(--primary);
  background: rgba(11,37,69,0.03);
  box-shadow: 0 0 0 4px rgba(11,37,69,0.08);
}
.choice:active .choice__content { transform: scale(0.98); }

/* ===== Equipment card ===== */
.equipment-suggest {
  background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 22px;
  position: relative;
}
.equipment-suggest__badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #92400E;
  background: rgba(245,158,11,0.25);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}
.equipment-suggest__power {
  font-size: 2rem;
  font-weight: 800;
  color: #78350F;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.equipment-suggest__desc {
  color: #92400E;
  font-size: 0.85rem;
  margin-top: 4px;
}

.equipment-card {
  display: flex; align-items: center; gap: 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}
.equipment-card__icon {
  width: 44px; height: 44px;
  background: var(--bg-alt);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.equipment-card__name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--ink);
  margin-bottom: 2px;
}
.equipment-card__meta {
  font-size: 0.8rem;
  color: var(--ink-mute);
}

/* ===== Range slider ===== */
.range-group {
  display: flex; align-items: center; gap: 14px;
}
input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px; height: 24px;
  background: var(--primary);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(11,37,69,0.3);
  border: 3px solid #fff;
}
input[type="range"]::-moz-range-thumb {
  width: 24px; height: 24px;
  background: var(--primary);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(11,37,69,0.3);
  border: 3px solid #fff;
}
.range-value {
  min-width: 80px;
  padding: 6px 12px;
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.88rem;
  text-align: center;
}

/* ===== Toggle ===== */
.toggle {
  display: flex; align-items: center; gap: 12px;
  cursor: pointer;
  padding: 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.toggle input { display: none; }
.toggle__track {
  width: 44px; height: 26px;
  background: var(--border);
  border-radius: 999px;
  position: relative;
  transition: background 0.2s;
  flex-shrink: 0;
}
.toggle__track::after {
  content: '';
  position: absolute;
  top: 3px; left: 3px;
  width: 20px; height: 20px;
  background: #fff;
  border-radius: 50%;
  transition: all 0.2s;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}
.toggle input:checked + .toggle__track { background: var(--primary); }
.toggle input:checked + .toggle__track::after { left: 21px; }
.toggle__label {
  font-size: 0.92rem;
  color: var(--ink);
  font-weight: 500;
}

/* ===== Result ===== */
.result-hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
  border-radius: var(--radius);
  padding: 24px 20px;
  margin-bottom: 18px;
  color: #fff;
  text-align: center;
}
.result-hero__label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  opacity: 0.7;
  margin-bottom: 4px;
}
.result-hero__value {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
}
.result-hero__note {
  font-size: 0.85rem;
  opacity: 0.75;
  margin-top: 6px;
}

.metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 20px;
}
.metric {
  background: var(--bg);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  padding: 14px;
  text-align: center;
}
.metric__value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 2px;
}
.metric__label {
  font-size: 0.75rem;
  color: var(--ink-dim);
  line-height: 1.3;
}

.chart-card {
  background: var(--bg);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 20px;
}
.chart-card__title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink-dim);
  margin-bottom: 12px;
}
#paybackChart {
  width: 100% !important;
  height: auto !important;
  max-height: 200px;
  display: block;
}

.breakdown {
  background: var(--bg);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  overflow: hidden;
}
.breakdown__row {
  display: flex; justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-soft);
  font-size: 0.9rem;
}
.breakdown__row:last-child { border-bottom: none; }
.breakdown__row span:first-child { color: var(--ink-dim); }
.breakdown__row span:last-child { color: var(--ink); font-weight: 600; }
.breakdown__row--total {
  background: var(--bg-alt);
}
.breakdown__row--total span {
  font-weight: 700 !important;
  font-size: 1rem;
  color: var(--ink) !important;
}

/* ===== PDF ===== */
.pdf-ready {
  text-align: center;
  padding: 12px 0 24px;
}
.pdf-ready__icon {
  display: inline-flex;
  width: 96px; height: 96px;
  background: #D1FAE5;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.pdf-ready h2 {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.pdf-ready p {
  color: var(--ink-dim);
  font-size: 0.92rem;
  max-width: 280px;
  margin: 0 auto;
}

.pdf-preview {
  background: var(--ink-mute);
  border-radius: var(--radius);
  padding: 12px;
}
.pdf-preview__page {
  background: #fff;
  padding: 22px 18px;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
  font-size: 0.82rem;
  color: #0F172A;
}
.pdf-page__logo {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.pdf-page__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 2px;
}
.pdf-page__date {
  font-size: 0.75rem;
  color: var(--ink-mute);
  margin-bottom: 16px;
}
.pdf-page__section {
  margin-bottom: 14px;
}
.pdf-page__section-title {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 4px;
}
.pdf-page__kv {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  font-size: 0.78rem;
}
.pdf-page__kv span:nth-child(odd) { color: var(--ink-dim); }
.pdf-page__kv span:nth-child(even) { color: var(--ink); font-weight: 500; text-align: right; }
.pdf-page__footer {
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  font-size: 0.7rem;
  color: var(--ink-mute);
  text-align: center;
  line-height: 1.45;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: #fff;
  padding: 12px 20px;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  z-index: 1000;
  animation: toastIn 0.2s ease-out;
}
@keyframes toastIn {
  from { opacity: 0; transform: translate(-50%, 20px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* Force light mode — ignore browser/OS dark preference */
html { color-scheme: light; }