/* ──────────────────────────────────────────
   PriceMyCar — Main Stylesheet
   Font: Sora (UI) + DM Mono (numbers)
────────────────────────────────────────── */
:root {
  --blue:       #2563EB;
  --blue-light: #EFF6FF;
  --blue-dark:  #1E40AF;
  --green:      #16A34A;
  --red:        #DC2626;
  --yellow:     #D97706;
  --bg:         #F8FAFC;
  --surface:    #FFFFFF;
  --border:     #E2E8F0;
  --text:       #1E293B;
  --muted:      #64748B;
  --radius:     12px;
  --shadow:     0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.04);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body { font-family: 'Sora', sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }

/* ── NAV ── */
.navbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 40px; height: 64px; background: #fff;
  border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100;
}
.nav-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 600; color: var(--text); font-size: 1rem; }
.nav-logo { width: 30px; height: 30px; background: var(--blue); border-radius: 8px; display: grid; place-items: center; color: #fff; font-weight: 700; font-size: .9rem; }
.nav-links { display: flex; gap: 32px; list-style: none; }
.nav-links a { text-decoration: none; color: var(--muted); font-size: .875rem; font-weight: 500; transition: color .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--blue); }
.btn-primary { background: var(--blue); color: #fff; padding: 8px 20px; border-radius: 8px; font-size: .875rem; font-weight: 600; text-decoration: none; border: none; cursor: pointer; transition: background .2s; }
.btn-primary:hover { background: var(--blue-dark); }

/* ── HERO ── */
.hero { padding: 80px 40px 60px; max-width: 1100px; margin: 0 auto; display: flex; align-items: center; gap: 60px; }
.hero-text { flex: 1; }
.hero-badge { display: inline-flex; align-items: center; gap: 6px; background: var(--blue-light); color: var(--blue); padding: 4px 12px; border-radius: 20px; font-size: .75rem; font-weight: 600; margin-bottom: 20px; }
.hero h1 { font-size: 2.75rem; font-weight: 700; line-height: 1.2; margin-bottom: 16px; }
.hero h1 span { color: var(--blue); }
.hero p { color: var(--muted); margin-bottom: 28px; font-size: 1rem; max-width: 420px; }
.hero-btns { display: flex; gap: 12px; }
.btn-outline { background: #fff; color: var(--text); padding: 10px 22px; border-radius: 8px; font-size: .875rem; font-weight: 600; text-decoration: none; border: 1.5px solid var(--border); transition: border-color .2s; }
.btn-outline:hover { border-color: var(--blue); color: var(--blue); }
.hero-img { flex: 0 0 340px; }
.hero-img svg { width: 100%; }

/* ── WHY SECTION ── */
.why-section { background: var(--blue-light); padding: 80px 40px; text-align: center; }
.section-heading { font-size: 1.75rem; font-weight: 700; margin-bottom: 8px; }
.section-sub { color: var(--muted); margin-bottom: 48px; }
.cards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; max-width: 960px; margin: 0 auto; }
.card { background: #fff; border-radius: var(--radius); padding: 28px; text-align: left; box-shadow: var(--shadow); }
.card-icon { font-size: 1.5rem; margin-bottom: 12px; }
.card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 8px; }
.card p { font-size: .875rem; color: var(--muted); }

/* ── HOW IT WORKS ── */
.how-section { padding: 80px 40px; text-align: center; }
.steps-grid { display: flex; gap: 0; max-width: 700px; margin: 40px auto 0; position: relative; }
.steps-grid::before { content: ''; position: absolute; top: 24px; left: 48px; right: 48px; height: 2px; background: var(--border); z-index: 0; }
.step { flex: 1; text-align: center; position: relative; z-index: 1; }
.step-num { width: 48px; height: 48px; border-radius: 50%; background: var(--blue); color: #fff; font-weight: 700; display: grid; place-items: center; margin: 0 auto 16px; font-size: 1rem; }
.step h3 { font-size: .9rem; font-weight: 600; margin-bottom: 6px; }
.step p { font-size: .8rem; color: var(--muted); }

/* ── PREDICT PAGE ── */
.predict-page { padding: 48px 40px; max-width: 1100px; margin: 0 auto; }
.predict-page h1 { font-size: 1.875rem; font-weight: 700; margin-bottom: 6px; }
.page-sub { color: var(--muted); margin-bottom: 32px; }
.predict-container { display: grid; grid-template-columns: 1fr 300px; gap: 32px; align-items: start; }
.form-section { background: #fff; border-radius: var(--radius); padding: 28px; margin-bottom: 20px; border: 1px solid var(--border); }
.section-title { font-weight: 600; font-size: 1rem; margin-bottom: 20px; display: flex; align-items: center; gap: 8px; }
.section-icon { font-size: 1.1rem; }
.badge-new { background: var(--blue); color: #fff; font-size: .65rem; padding: 2px 8px; border-radius: 10px; font-weight: 700; }
.section-desc { font-size: .8rem; color: var(--muted); margin-bottom: 20px; line-height: 1.5; padding: 10px 14px; background: var(--blue-light); border-radius: 8px; }
.form-row { display: flex; gap: 16px; margin-bottom: 16px; }
.form-row.two-col > * { flex: 1; }
.form-group { display: flex; flex-direction: column; }
.form-group label { font-size: .8rem; font-weight: 600; color: var(--muted); margin-bottom: 6px; }
.form-group input, .form-group select {
  padding: 10px 14px; border: 1.5px solid var(--border); border-radius: 8px;
  font-family: 'Sora', sans-serif; font-size: .875rem; color: var(--text);
  background: #fff; transition: border-color .2s;
}
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--blue); }
.form-group small { font-size: .72rem; color: var(--muted); margin-top: 4px; }
.condition-section { border: 1.5px solid var(--blue); background: #FAFCFF; }
.penalty-preview { margin-top: 20px; padding: 14px; background: #fff; border-radius: 8px; border: 1px solid var(--border); }
.penalty-bar-wrap { display: flex; justify-content: space-between; margin-bottom: 8px; font-size: .8rem; font-weight: 500; }
.penalty-pct { color: var(--red); font-family: 'DM Mono', monospace; font-weight: 700; }
.penalty-bar { height: 8px; background: var(--border); border-radius: 4px; overflow: hidden; }
.penalty-fill { height: 100%; background: var(--red); border-radius: 4px; transition: width .4s; }
.btn-predict { width: 100%; padding: 16px; background: var(--blue); color: #fff; font-family: 'Sora', sans-serif; font-size: 1rem; font-weight: 600; border: none; border-radius: 10px; cursor: pointer; transition: background .2s; }
.btn-predict:hover { background: var(--blue-dark); }

/* sidebar */
.predict-sidebar { position: sticky; top: 80px; }
.sidebar-card { background: #fff; border-radius: var(--radius); padding: 20px; border: 1px solid var(--border); margin-bottom: 16px; }
.sidebar-card h3 { font-size: .9rem; font-weight: 600; margin-bottom: 14px; }
.progress-wrap { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.progress-bar { flex: 1; height: 8px; background: var(--border); border-radius: 4px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--blue); border-radius: 4px; transition: width .4s; }
.progress-wrap span { font-size: .8rem; font-weight: 700; color: var(--blue); font-family: 'DM Mono', monospace; min-width: 36px; }
.completeness-list { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.completeness-list li { font-size: .8rem; padding-left: 20px; position: relative; color: var(--muted); }
.completeness-list li::before { content: '○'; position: absolute; left: 0; color: var(--muted); }
.completeness-list li.done { color: var(--green); }
.completeness-list li.done::before { content: '✓'; color: var(--green); }
.how-card p { font-size: .8rem; color: var(--muted); }

/* ── RESULT PAGE ── */
.result-page { padding: 48px 40px; max-width: 1100px; margin: 0 auto; }
.back-link { font-size: .8rem; color: var(--muted); text-decoration: none; display: inline-flex; align-items: center; gap: 4px; margin-bottom: 20px; }
.back-link:hover { color: var(--blue); }
.result-page h1 { font-size: 1.875rem; font-weight: 700; margin-bottom: 4px; }
.result-grid { display: grid; grid-template-columns: 1fr 360px; gap: 28px; margin-top: 28px; }
.price-card { background: #fff; border-radius: var(--radius); padding: 32px; border: 1px solid var(--border); margin-bottom: 20px; }
.confidence-badge { display: inline-flex; align-items: center; gap: 6px; background: #D1FAE5; color: var(--green); padding: 4px 12px; border-radius: 20px; font-size: .75rem; font-weight: 600; margin-bottom: 20px; }
.confidence-badge::before { content: '●'; font-size: .6rem; }
.price-label { font-size: .8rem; color: var(--muted); margin-bottom: 8px; }
.price-main { font-size: 2.5rem; font-weight: 700; color: var(--text); font-family: 'DM Mono', monospace; }
.price-adjustment { display: flex; align-items: center; gap: 10px; margin-top: 8px; flex-wrap: wrap; }
.base-label { font-size: .8rem; color: var(--muted); }
.penalty-tag { background: #FEF2F2; color: var(--red); padding: 2px 10px; border-radius: 20px; font-size: .75rem; font-weight: 600; }
.price-range { font-size: .8rem; color: var(--muted); margin-top: 12px; font-family: 'DM Mono', monospace; }
.chart-card { background: #fff; border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); }
.chart-card h3 { font-size: .9rem; font-weight: 600; margin-bottom: 20px; }
.bar-chart { display: flex; align-items: flex-end; gap: 20px; height: 120px; }
.bar-group { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 8px; height: 100%; justify-content: flex-end; }
.bar { width: 100%; background: #CBD5E1; border-radius: 4px 4px 0 0; transition: height .5s; }
.bar.highlight { background: var(--blue); }
.bar-group span { font-size: .7rem; color: var(--muted); text-align: center; }
.factors-card { background: #fff; border-radius: var(--radius); padding: 20px; border: 1px solid var(--border); margin-bottom: 16px; }
.factors-card h3 { font-size: .9rem; font-weight: 600; margin-bottom: 14px; }
.factor { padding: 12px 14px; border-radius: 8px; margin-bottom: 10px; font-size: .8rem; }
.factor.positive { background: #F0FDF4; border-left: 3px solid var(--green); }
.factor.negative { background: #FFF7ED; border-left: 3px solid var(--yellow); }
.factor-label { font-weight: 600; margin-bottom: 4px; font-size: .75rem; }
.breakdown-table { width: 100%; border-collapse: collapse; font-size: .78rem; }
.breakdown-table th { text-align: left; padding: 6px 8px; border-bottom: 1.5px solid var(--border); color: var(--muted); font-weight: 600; }
.breakdown-table td { padding: 6px 8px; border-bottom: 1px solid var(--border); }
.breakdown-table .total-row td { border-top: 1.5px solid var(--border); border-bottom: none; }
.penalty-neg { color: var(--red); font-family: 'DM Mono', monospace; font-weight: 600; }
.penalty-pos { color: var(--green); font-family: 'DM Mono', monospace; font-weight: 600; }

/* ── DATA INSIGHTS PAGE ── */
.insights-page { padding: 48px 40px; max-width: 1100px; margin: 0 auto; }
.insights-page h1 { font-size: 1.875rem; font-weight: 700; margin-bottom: 6px; }
.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 28px 0; }
.stat-card { background: #fff; border-radius: var(--radius); padding: 20px 24px; border: 1px solid var(--border); }
.stat-label { font-size: .75rem; color: var(--muted); font-weight: 600; margin-bottom: 6px; }
.stat-value { font-size: 1.75rem; font-weight: 700; font-family: 'DM Mono', monospace; }
.charts-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
.chart-wrap { background: #fff; border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); }
.chart-wrap h3 { font-size: .9rem; font-weight: 600; margin-bottom: 16px; }

/* ── MODEL INFO PAGE ── */
.model-page { padding: 48px 40px 80px; max-width: 900px; margin: 0 auto; text-align: center; }
.model-page h1 { font-size: 2rem; font-weight: 700; margin-bottom: 10px; }
.pipeline { display: flex; gap: 0; margin: 48px 0 64px; position: relative; }
.pipeline::before { content: ''; position: absolute; top: 28px; left: 64px; right: 64px; height: 2px; background: var(--border); }
.pipe-step { flex: 1; text-align: center; position: relative; z-index: 1; }
.pipe-icon { width: 56px; height: 56px; border-radius: var(--radius); background: #fff; border: 1.5px solid var(--border); display: grid; place-items: center; margin: 0 auto 12px; font-size: 1.3rem; }
.pipe-step.active .pipe-icon { background: var(--blue); border-color: var(--blue); }
.pipe-step h4 { font-size: .8rem; font-weight: 600; margin-bottom: 4px; }
.pipe-step p { font-size: .73rem; color: var(--muted); }
.algo-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-top: 48px; text-align: left; }
.algo-section h2, .metrics-section h2 { font-size: 1.25rem; font-weight: 700; margin-bottom: 16px; }
.algo-section p { font-size: .875rem; color: var(--muted); margin-bottom: 12px; }
.feature-list { list-style: none; display: flex; flex-direction: column; gap: 12px; margin-top: 16px; }
.feature-list li { display: block; position: relative; padding-left: 24px; font-size: .875rem; text-align: left; line-height: 1.5; }
.feature-list li::before { content: '✓'; color: var(--green); font-weight: 700; position: absolute; left: 0; top: 1px; }
.metric-row { background: #fff; border-radius: var(--radius); padding: 18px 20px; border: 1px solid var(--border); display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 12px; }
.metric-name { font-weight: 600; font-size: .9rem; margin-bottom: 4px; }
.metric-desc { font-size: .78rem; color: var(--muted); }
.metric-val { font-size: 1.25rem; font-weight: 700; font-family: 'DM Mono', monospace; color: var(--blue); }

/* ── ABOUT PAGE ── */
.about-page { padding: 64px 40px 80px; max-width: 900px; margin: 0 auto; text-align: center; }
.about-page h1 { font-size: 2rem; font-weight: 700; margin-bottom: 10px; }
.about-body { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin: 48px 0; text-align: left; }
.about-left h2, .dataset-card h2 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.about-left p { font-size: .875rem; color: var(--muted); line-height: 1.7; }
.dataset-card { background: #fff; border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); height: fit-content; }
.dataset-row { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--border); font-size: .875rem; }
.dataset-row:last-child { border: none; }
.dataset-row span:last-child { font-weight: 600; }
.team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.team-card { background: #fff; border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); text-align: center; }
.team-avatar { width: 64px; height: 64px; border-radius: 50%; background: var(--blue-light); display: grid; place-items: center; margin: 0 auto 12px; font-size: 1.5rem; }
.team-card h4 { font-weight: 600; font-size: .9rem; margin-bottom: 4px; }
.team-card span { font-size: .78rem; color: var(--blue); }

/* ── FOOTER ── */
.footer { background: #fff; border-top: 1px solid var(--border); padding: 48px 40px 24px; }
.footer-inner { display: flex; gap: 64px; max-width: 1100px; margin: 0 auto 32px; }
.footer-brand { flex: 2; }
.footer-brand p { font-size: .8rem; color: var(--muted); margin-top: 12px; line-height: 1.6; }
.footer-col h4 { font-size: .8rem; font-weight: 700; margin-bottom: 14px; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer-col a { font-size: .8rem; color: var(--muted); text-decoration: none; }
.footer-col a:hover { color: var(--blue); }
.footer-copy { text-align: center; font-size: .75rem; color: var(--muted); max-width: 1100px; margin: 0 auto; padding-top: 24px; border-top: 1px solid var(--border); }

/* ── ALERT ── */
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 20px; font-size: .875rem; display: flex; gap: 12px; align-items: flex-start; text-align: left; }
.alert-error { background: #FEF2F2; color: var(--red); border: 1px solid #FECACA; }
.alert-warning { background: #FFFBEB; color: #92400E; border: 1px solid #FDE68A; }
.alert-warning h4 { font-weight: 600; margin-bottom: 4px; font-size: .9rem; color: #78350F; }
.alert-warning p { font-size: .82rem; color: #92400E; margin: 0; line-height: 1.4; }
.alert-icon { font-size: 1.25rem; }

/* ── MODELS CARD (PREDICT PAGE SIDEBAR) ── */
.models-details { font-size: .8rem; color: var(--muted); cursor: pointer; }
.models-details summary { font-weight: 600; color: var(--blue); margin-bottom: 6px; outline: none; }
.supported-models-list { font-size: .75rem; line-height: 1.5; color: var(--text); background: var(--bg); padding: 12px; border-radius: 6px; border: 1px solid var(--border); margin-top: 6px; max-height: 200px; overflow-y: auto; text-align: left; }

/* ── ANALYSIS CARD (RESULT PAGE) ── */
.analysis-card { background: #fff; border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); margin-top: 20px; text-align: left; }
.analysis-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 20px; color: var(--text); }
.analysis-section { margin-bottom: 20px; }
.analysis-section:last-child { margin-bottom: 0; }
.analysis-section h4 { font-size: .85rem; font-weight: 600; margin-bottom: 8px; color: var(--blue); }
.analysis-section p { font-size: .8rem; color: var(--muted); line-height: 1.6; margin-bottom: 12px; }
.deviation-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 12px; }
.dev-item { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 12px; position: relative; }
.dev-item strong { display: block; font-size: .78rem; font-weight: 600; color: var(--text); margin-bottom: 4px; padding-left: 24px; }
.dev-icon { position: absolute; left: 12px; top: 12px; font-size: .95rem; }
.dev-item p { font-size: .72rem; color: var(--muted); line-height: 1.4; margin: 0; padding-left: 24px; }


/* ── RESPONSIVE DESIGN (MEDIA QUERIES) ── */
@media (max-width: 992px) {
  .predict-container {
    grid-template-columns: 1fr;
  }
  .result-grid {
    grid-template-columns: 1fr;
  }
  .predict-sidebar {
    position: static;
  }
}

@media (max-width: 768px) {
  html { font-size: 15px; }
  
  .navbar {
    padding: 12px 20px;
    height: auto;
    flex-direction: column;
    gap: 12px;
  }
  .nav-links {
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .hero {
    flex-direction: column-reverse;
    padding: 40px 20px;
    gap: 32px;
    text-align: center;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .hero p {
    margin: 0 auto 24px;
  }
  .hero-btns {
    justify-content: center;
  }
  .hero-img {
    flex: 0 0 auto;
    width: 200px;
  }
  
  .why-section, .how-section, .predict-page, .result-page, .insights-page, .model-page, .about-page {
    padding: 40px 20px;
  }
  
  .cards-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .steps-grid {
    flex-direction: column;
    gap: 32px;
  }
  .steps-grid::before {
    display: none;
  }
  
  .form-row {
    flex-direction: column;
    gap: 16px;
  }
  .form-row.two-col > * {
    flex: none;
    width: 100%;
  }
  
  .charts-row {
    grid-template-columns: 1fr;
  }
  
  .deviation-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .about-body {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  
  .footer-inner {
    flex-direction: column;
    gap: 32px;
    text-align: center;
  }
  .footer-brand {
    text-align: center;
  }
}

@media (max-width: 480px) {
  .team-grid {
    grid-template-columns: 1fr;
  }
  .hero-btns {
    flex-direction: column;
    width: 100%;
  }
  .btn-primary, .btn-outline {
    text-align: center;
    width: 100%;
  }
}