*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --green: #16a34a;
  --green-light: #dcfce7;
  --green-dark: #15803d;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-400: #9ca3af;
  --gray-600: #4b5563;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --blue-50: #eff6ff;
  --blue-600: #2563eb;
  --amber-50: #fffbeb;
  --amber-600: #d97706;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
  --shadow-lg: 0 4px 6px rgba(0,0,0,.07), 0 10px 40px rgba(0,0,0,.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── HEADER ── */
.header {
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo { font-weight: 700; font-size: 1.1rem; color: var(--green); }
.logo span { color: var(--gray-800); }

/* ── HERO ── */
.hero {
  background: linear-gradient(135deg, #f0fdf4 0%, #eff6ff 100%);
  padding: 64px 24px 56px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--gray-900);
  line-height: 1.2;
  max-width: 680px;
  margin: 0 auto 16px;
}
.hero h1 em { font-style: normal; color: var(--green); }
.hero p {
  font-size: 1.1rem;
  color: var(--gray-600);
  max-width: 480px;
  margin: 0 auto 32px;
}
.trust-badges {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}
.badge {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: .82rem;
  color: var(--gray-600);
  display: flex;
  align-items: center;
  gap: 5px;
}
.badge .icon { color: var(--green); font-size: .9rem; }

/* ── UPLOAD SECTION ── */
.upload-section {
  max-width: 680px;
  margin: -28px auto 0;
  padding: 0 24px 48px;
}
.upload-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 40px 32px;
}
.upload-card h2 { font-size: 1.15rem; font-weight: 700; margin-bottom: 6px; }
.upload-card p { color: var(--gray-600); font-size: .9rem; margin-bottom: 24px; }

.drop-zone {
  border: 2px dashed var(--gray-200);
  border-radius: var(--radius);
  padding: 36px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  position: relative;
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--green);
  background: var(--green-light);
}
.drop-zone input[type=file] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%;
}
.drop-icon { font-size: 2.4rem; margin-bottom: 10px; }
.drop-zone strong { display: block; font-size: 1rem; color: var(--gray-800); margin-bottom: 4px; }
.drop-zone small { color: var(--gray-400); font-size: .82rem; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--green);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 13px 28px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, transform .1s;
  margin-top: 20px;
  width: 100%;
  justify-content: center;
}
.btn-primary:hover { background: var(--green-dark); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }

/* ── LOADING ── */
#loading {
  display: none;
  text-align: center;
  padding: 32px 0 8px;
}
.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  margin: 0 auto 12px;
}
@keyframes spin { to { transform: rotate(360deg); } }
#loading p { color: var(--gray-600); font-size: .9rem; }

/* ── ERROR ── */
#error-box {
  display: none;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 8px;
  padding: 14px 18px;
  color: #b91c1c;
  font-size: .9rem;
  margin-top: 16px;
}

/* ── RESULTS ── */
#results {
  display: none;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px 64px;
}
.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 12px;
}
.results-header h2 { font-size: 1.35rem; font-weight: 800; }
.btn-secondary {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 9px 18px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--gray-700, #374151);
  transition: border-color .15s;
}
.btn-secondary:hover { border-color: var(--green); color: var(--green); }

/* Metric cards */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.metric-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 22px 20px;
  box-shadow: var(--shadow);
}
.metric-card .label { font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; color: var(--gray-400); margin-bottom: 6px; }
.metric-card .value { font-size: 1.6rem; font-weight: 800; color: var(--gray-900); line-height: 1; }
.metric-card.highlight { background: var(--green); }
.metric-card.highlight .label { color: rgba(255,255,255,.75); }
.metric-card.highlight .value { color: #fff; }

/* Charts row */
.charts-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}
@media (max-width: 600px) { .charts-row { grid-template-columns: 1fr; } }

.chart-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}
.chart-card h3 { font-size: .9rem; font-weight: 700; color: var(--gray-600); margin-bottom: 16px; text-transform: uppercase; letter-spacing: .05em; }
.chart-card canvas { max-height: 220px; }

/* Top expenses */
.top-expenses-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 24px;
}
.top-expenses-card h3 { font-size: .9rem; font-weight: 700; color: var(--gray-600); margin-bottom: 16px; text-transform: uppercase; letter-spacing: .05em; }
.expense-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--gray-100);
  gap: 12px;
}
.expense-item:last-child { border-bottom: none; }
.expense-label { font-size: .9rem; color: var(--gray-800); flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.expense-bar-wrap { flex: 0 0 120px; height: 6px; background: var(--gray-100); border-radius: 99px; overflow: hidden; }
.expense-bar { height: 100%; background: var(--green); border-radius: 99px; transition: width .6s ease; }
.expense-amount { font-size: .9rem; font-weight: 700; color: var(--gray-900); min-width: 80px; text-align: right; }

/* AI Insights */
.insights-card {
  background: linear-gradient(135deg, #f0fdf4, #eff6ff);
  border: 1px solid var(--green-light);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}
.insights-card .insights-header {
  display: flex; align-items: center; gap: 10px; margin-bottom: 16px;
}
.insights-card .insights-header h3 { font-size: 1rem; font-weight: 700; color: var(--gray-900); }
.insights-badge {
  background: var(--green); color: #fff;
  font-size: .7rem; font-weight: 700;
  padding: 3px 9px; border-radius: 99px; letter-spacing: .05em;
}
.insights-body { color: var(--gray-800); font-size: .95rem; line-height: 1.75; white-space: pre-line; }

/* ── FOOTER ── */
footer {
  background: var(--gray-900);
  color: var(--gray-400);
  text-align: center;
  padding: 40px 24px;
  font-size: .85rem;
}
footer p + p { margin-top: 6px; }
footer a { color: var(--gray-400); text-decoration: underline; }
.footer-trust { color: var(--green); margin-top: 12px; font-size: .8rem; }