/* ============================================================
   style.css — PurchaseIQ
   Dark financial UI: think Bloomberg Terminal meets fintech
   ============================================================ */

/* ── CSS Variables (Design Tokens) ─────────────────────────
   We define all colors once here. If we want to change the
   green accent for example, we only change it in ONE place
   and it updates everywhere automatically. */
:root {
  --bg-primary:      #0a0e17;   /* Deep navy-black background */
  --bg-card:         #111827;   /* Card surfaces */
  --bg-card-hover:   #1a2234;   /* Card hover state */
  --accent-green:    #00d4aa;   /* Positive values / CTA button */
  --accent-amber:    #f59e0b;   /* Warnings / costs */
  --accent-red:      #ef4444;   /* Negative / loss values */
  --text-primary:    #f1f5f9;   /* Main text */
  --text-secondary:  #94a3b8;   /* Labels and secondary info */
  --text-muted:      #475569;   /* Placeholder / disabled */
  --border:          #1e2d40;   /* Card borders */
  --border-focus:    #00d4aa;   /* Input focus ring */
  --radius:          12px;      /* Card corner radius */
  --radius-sm:       6px;       /* Input corner radius */
  --transition:      0.2s ease; /* Standard animation speed */
}

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

html { scroll-behavior: smooth; }

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
  /* Subtle animated grid background — pure CSS, no JavaScript needed */
  background-image:
    linear-gradient(rgba(0, 212, 170, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 170, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* ── Typography ──────────────────────────────────────────── */
/* Syne is used for headings — geometric and distinctive */
/* IBM Plex Mono is used for numbers — adds financial credibility */
h1, h2, h3, .logo-text { font-family: 'Syne', sans-serif; }
h2 { font-size: 1.25rem; font-weight: 700; }
h3 { font-size: 1rem;    font-weight: 700; }

/* ── Header ──────────────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 2rem;
  position: sticky;   /* stays at top when user scrolls */
  top: 0;
  background: rgba(10, 14, 23, 0.92);
  backdrop-filter: blur(12px); /* frosted glass effect */
  z-index: 100;
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.logo-icon  { width: 38px; height: 38px; flex-shrink: 0; }

.logo-text {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.tagline {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-style: italic;
}

/* ── Notice Banner ───────────────────────────────────────── */
/* Shown when an API fails and we fall back to default values */
.notice-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 2rem;
  background: rgba(245, 158, 11, 0.12);
  border-bottom: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--accent-amber);
  font-size: 0.82rem;
  gap: 1rem;
}

.notice-banner.error {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
  color: var(--accent-red);
}

.notice-close {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: 1rem;
  padding: 0.25rem;
  opacity: 0.7;
  transition: opacity var(--transition);
}
.notice-close:hover { opacity: 1; }

/* ── App Layout ──────────────────────────────────────────── */
/* Two columns on desktop: input (38%) | results (rest) */
.app-layout {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
  display: grid;
  grid-template-columns: 38% 1fr;
  gap: 2rem;
  align-items: start;
}

/* ── Input Panel ─────────────────────────────────────────── */
.input-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  position: sticky; /* stays visible while user scrolls results */
  top: 80px;
}

.panel-title {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

/* ── Form Fields ─────────────────────────────────────────── */
.field-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.field-group.flex-grow { flex: 1; }

.field-row {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.label-hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: none;
  letter-spacing: 0;
  font-weight: 400;
}

/* Shared styles for all inputs and selects */
input[type="text"],
input[type="number"],
select {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.9rem;
  padding: 0.65rem 0.85rem;
  width: 100%;
  min-height: 44px; /* minimum touch target for accessibility */
  appearance: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

/* Green glow when an input is focused */
input:focus, select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.1);
}

/* Red border when validation fails */
input.error { border-color: var(--accent-red); }

input::placeholder { color: var(--text-muted); }

/* Custom dropdown arrow for select elements */
select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394a3b8' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
  padding-right: 2.5rem;
}

select option { background: #1a2234; }

/* Inline error messages below invalid fields */
.field-error {
  font-size: 0.75rem;
  color: var(--accent-red);
  min-height: 1rem;
}

.field-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: -0.5rem;
  margin-bottom: 1rem;
}

/* ── Range Slider ────────────────────────────────────────── */
.range-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
  border: none;
  padding: 0;
  min-height: 44px;
  background-clip: content-box;
  padding-block: 19px;
}

/* The draggable circle on the slider */
.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-green);
  cursor: pointer;
  border: 3px solid var(--bg-card);
  box-shadow: 0 0 0 2px var(--accent-green);
}

.range-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-green);
  cursor: pointer;
  border: 3px solid var(--bg-card);
}

.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: -0.25rem;
}

/* ── Toggle Switch ───────────────────────────────────────── */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.toggle-label { flex: 1; }

.toggle-btn {
  width: 48px;
  height: 26px;
  background: var(--border);
  border: 1.5px solid var(--border);
  border-radius: 13px;
  cursor: pointer;
  position: relative;
  transition: background var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

/* Green when toggled ON */
.toggle-btn[aria-checked="true"] {
  background: var(--accent-green);
  border-color: var(--accent-green);
}

/* The white circle inside the toggle */
.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: var(--text-primary);
  border-radius: 50%;
  transition: transform var(--transition);
}

/* Slide the circle to the right when ON */
.toggle-btn[aria-checked="true"] .toggle-thumb {
  transform: translateX(22px);
}

.recurring-fields {
  background: rgba(0, 212, 170, 0.04);
  border: 1px solid rgba(0, 212, 170, 0.15);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 1.25rem;
}

/* ── Analyze Button ──────────────────────────────────────── */
.analyze-btn {
  width: 100%;
  padding: 0.9rem 1.5rem;
  background: var(--accent-green);
  color: #0a0e17;
  border: none;
  border-radius: var(--radius-sm);
  font-family: 'Syne', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  min-height: 44px;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.analyze-btn:hover {
  background: #00bfa0;
  box-shadow: 0 4px 20px rgba(0, 212, 170, 0.3);
  transform: translateY(-1px);
}

.analyze-btn:active  { transform: translateY(0); }

.analyze-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* ── Empty State ─────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  text-align: center;
  background: var(--bg-card);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  min-height: 300px;
  gap: 1rem;
}

.empty-icon { font-size: 3rem; opacity: 0.4; }

.empty-state h3 { color: var(--text-secondary); }

.empty-state p {
  color: var(--text-muted);
  max-width: 320px;
  font-size: 0.85rem;
}

/* ── Loading / Skeleton ──────────────────────────────────── */
.loading-state { display: flex; flex-direction: column; gap: 1.5rem; }

.progress-log {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.progress-item {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

/* Turns green when API call is done */
.progress-item.done { color: var(--accent-green); }

/* Grey pulsing placeholder cards shown while loading */
.skeleton-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 0.4; }
  50%       { opacity: 0.7; }
}

.skeleton-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  height: 160px;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

/* ── Result Cards ────────────────────────────────────────── */
.results-title {
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}
.results-title span { color: var(--text-primary); }

.cards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

/* Cards animate in with a staggered fade + slide up effect */
.result-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: background var(--transition), border-color var(--transition);
  opacity: 0;
  transform: translateY(16px);
  animation: card-appear 0.4s ease forwards;
}

.result-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(0, 212, 170, 0.2);
}

@keyframes card-appear {
  to { opacity: 1; transform: translateY(0); }
}

/* Each card appears slightly after the previous one */
.result-card:nth-child(1) { animation-delay: 0.05s; }
.result-card:nth-child(2) { animation-delay: 0.10s; }
.result-card:nth-child(3) { animation-delay: 0.15s; }
.result-card:nth-child(4) { animation-delay: 0.20s; }

.card-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.card-icon { font-size: 1.1rem; }

.card-header h3 {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 400;
}

.card-main-stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  margin-bottom: 0.75rem;
}

/* The big number in each card */
.stat-value {
  font-size: 1.8rem;
  font-weight: 500;
  font-family: 'IBM Plex Mono', monospace;
  line-height: 1.1;
}

.stat-value.green { color: var(--accent-green); }
.stat-value.amber { color: var(--accent-amber); }
.stat-value.red   { color: var(--accent-red);   }

.stat-unit  { font-size: 0.8rem; color: var(--text-secondary); }
.stat-label { font-size: 0.72rem; color: var(--text-muted); }

.card-subtext {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Small badge showing which API provided the data */
.source-badge {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.68rem;
  color: var(--text-muted);
  background: rgba(30, 45, 64, 0.8);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* Inflation card — two stats side by side */
.inflation-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.inflation-stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.inflation-stat .stat-value { font-size: 1.3rem; }

/* Work hours card — day/week sub-stats */
.work-substats {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

/* Horizontal bar showing hours as % of a 40hr week */
.hours-bar-track {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.hours-bar-fill {
  height: 100%;
  background: var(--accent-amber);
  border-radius: 3px;
  width: 0; /* starts at 0, animated by JS */
  transition: width 0.8s ease;
}

.hours-bar-label {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  display: block;
}

/* ── Chart Section ───────────────────────────────────────── */
.chart-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  opacity: 0;
  animation: card-appear 0.5s ease 0.3s forwards;
}

.chart-title {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 400;
  margin-bottom: 1rem;
}

.chart-wrapper {
  position: relative;
  height: 280px;
  overflow-x: auto; /* scrollable on mobile */
}

/* ── Footer ──────────────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: 2rem;
  border-top: 1px solid var(--border);
  margin-top: 3rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 2;
}

.site-footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}

.site-footer a:hover { color: var(--accent-green); }

.disclaimer { font-style: italic; }

/* ── Utility ─────────────────────────────────────────────── */
/* .hidden completely removes an element from the layout */
.hidden { display: none !important; }

/* ── Responsive: Tablet (768px–1023px) ──────────────────── */
@media (max-width: 1023px) {
  .app-layout {
    grid-template-columns: 1fr; /* single column */
    padding: 1.25rem;
  }
  .input-panel { position: static; } /* no longer sticky */
}

/* ── Responsive: Mobile (< 768px) ───────────────────────── */
@media (max-width: 767px) {
  .site-header  { padding: 1rem; }
  .tagline      { display: none; }
  .app-layout   { padding: 1rem; gap: 1rem; }
  .field-row    { flex-direction: column; gap: 0; }
  .cards-grid   { grid-template-columns: 1fr; }
  .skeleton-grid { grid-template-columns: 1fr; }
  .inflation-stats { grid-template-columns: 1fr; }
  .stat-value   { font-size: 1.4rem; }
  .chart-wrapper { min-width: 500px; }
}