/* =============================================
   Stackclean — styles
   All brand colours, typography, and spacing
   per assets/brand.md
   ============================================= */

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

:root {
  /* palette */
  --color-bg:          #faf5ed;
  --color-surface:     #efe8dd;
  --color-primary:     #3a7a6a;
  --color-primary-dim: #2d604f;
  --color-accent:      #c97b3a;
  --color-accent-dim:  #a8662d;
  --color-urgency:     #c95a4a;
  --color-text:        #2a2825;
  --color-text-muted:  #5a5752;
  --color-border:      #d6d0c8;
  --color-highlight:   #e8e0c8;

  /* brand tokens (per assets/brand.md) */
  --font-display: 'Söhne', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
  --radius: 4px;
  --space-unit: 12px;

  /* stance: spacious */
}

/* ---- Dark theme ---- */
:root[data-theme="dark"] {
  --color-bg:          #2a2825;
  --color-surface:     #3a3530;
  --color-primary:     #5aa88a;
  --color-primary-dim: #4a8a6a;
  --color-accent:      #d9944a;
  --color-accent-dim:  #b87a2d;
  --color-urgency:     #d97a5a;
  --color-text:        #faf5ed;
  --color-text-muted:  #c8c0b0;
  --color-border:      #4a4538;
  --color-highlight:   #4a4538;
}

/* ---- Typography ---- */

body {
  font-family: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .heading-display {
  font-family: 'Söhne', 'Helvetica Neue', Arial, sans-serif;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

code, pre, .data-row, .csv-preview {
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  font-size: 0.9em;
}

/* ---- Base layout ---- */
.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 calc(var(--space-unit) * 2);
}

/* ---- Hero ---- */
.hero {
  text-align: center;
  padding-top: calc(var(--space-unit) * 3);
  padding-bottom: calc(var(--space-unit) * 1);
}

.hero-text {
  max-width: 540px;
  margin: 0 auto;
}

.hero-text h1 {
  font-size: 2.2rem;
  letter-spacing: -0.01em;
  margin-bottom: 0.4em;
}

.hero-text p {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 540px;
  margin: 0 auto calc(var(--space-unit) * 2);
}

.hero-image {
  margin: calc(var(--space-unit) * 2.5) auto calc(var(--space-unit) * 2);
  max-width: 720px;
  border-radius: 4px;
  overflow: hidden;
  line-height: 0;
}

.hero-image img {
  display: block;
  width: 100%;
  height: auto;
}

.cta-button {
  display: inline-block;
  font-family: 'Söhne', 'Helvetica Neue', Arial, sans-serif;
  font-weight: 600;
  font-size: 1rem;
  padding: calc(var(--space-unit) * 1.2) calc(var(--space-unit) * 2.5);
  background: var(--color-accent);
  color: var(--color-bg);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: transform 150ms ease-out, background 150ms ease-out;
}

.cta-button:hover,
.cta-button:focus-visible {
  background: var(--color-accent-dim);
  transform: translateY(-1px);
}

.cta-button:active {
  transform: translateY(0);
}

/* ---- Section headings ---- */
.section-title {
  font-size: 1.5rem;
  margin-top: calc(var(--space-unit) * 3);
  margin-bottom: calc(var(--space-unit) * 1.5);
  color: var(--color-primary);
}

/* ---- Upload zone ---- */
.upload-zone {
  background: var(--color-surface);
  border: 2px dashed var(--color-border);
  border-radius: 4px;
  padding: calc(var(--space-unit) * 3);
  text-align: center;
  margin-top: calc(var(--space-unit) * 2);
  transition: border-color 200ms ease-out;
  cursor: pointer;
}

.upload-zone.drag-over {
  border-color: var(--color-primary-dim);
}

.upload-zone p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: calc(var(--space-unit) * 0.5);
}

.upload-zone input[type="file"] {
  display: block;
  margin: calc(var(--space-unit) * 0.5) auto 0;
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.9rem;
}

/* ---- Privacy notice ---- */
.privacy-notice {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: calc(var(--space-unit) * 0.5);
  line-height: 1.4;
}

/* ---- Column mapping ---- */
.mapping-area {
  background: var(--color-surface);
  border-radius: 4px;
  padding: calc(var(--space-unit) * 2) calc(var(--space-unit) * 1.5);
  margin-top: calc(var(--space-unit) * 1.5);
}

.mapping-area h3 {
  font-size: 1.1rem;
  margin-bottom: calc(var(--space-unit) * 1);
}

.mapping-row {
  display: flex;
  align-items: center;
  gap: calc(var(--space-unit) * 0.67);
  margin-bottom: calc(var(--space-unit) * 0.5);
  font-size: 0.95rem;
}

.mapping-row label {
  min-width: 100px;
  color: var(--color-text);
  font-family: 'Söhne', 'Helvetica Neue', Arial, sans-serif;
  font-weight: 600;
}

.mapping-row select {
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  font-size: 0.9rem;
  padding: calc(var(--space-unit) * 0.3) calc(var(--space-unit) * 0.4);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg);
  color: var(--color-text);
}

.csv-preview-box {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: calc(var(--space-unit) * 0.6);
  margin-top: calc(var(--space-unit) * 0.8);
  max-height: 180px;
  overflow: auto;
  font-size: 0.8rem;
  line-height: 1.35;
  white-space: pre;
}

/* ---- Controls row ---- */
.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space-unit) * 1);
  margin-top: calc(var(--space-unit) * 1.5);
  align-items: center;
}

.controls-row label {
  font-family: 'Söhne', 'Helvetica Neue', Arial, sans-serif;
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--color-text);
}

.controls-row input[type="range"] {
  width: 140px;
  accent-color: var(--color-primary);
}

.controls-row select {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 0.9rem;
  padding: calc(var(--space-unit) * 0.3) calc(var(--space-unit) * 0.4);
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

/* ---- Results area ---- */
.results-area {
  margin-top: calc(var(--space-unit) * 2);
}

/* ---- Month block ---- */
.month-block {
  background: var(--color-surface);
  border-radius: 4px;
  padding: calc(var(--space-unit) * 1.5) calc(var(--space-unit) * 1.5) calc(var(--space-unit) * 1) calc(var(--space-unit) * 1.5);
  margin-bottom: calc(var(--space-unit) * 2.5);
  opacity: 0;
  animation: month-fade-in 300ms ease-out forwards;
}

@keyframes month-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.month-block:last-child {
  margin-bottom: 0;
}

.month-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: calc(var(--space-unit) * 0.5);
  margin-bottom: calc(var(--space-unit) * 0.5);
}

.month-header h3 {
  font-size: 1.3rem;
  color: var(--color-primary);
}

.month-stats {
  display: flex;
  gap: calc(var(--space-unit) * 0.8);
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-top: calc(var(--space-unit) * 1.25);
}

.month-stats span {
  white-space: nowrap;
}

.month-time-estimate {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-top: calc(var(--space-unit) * 0.4);
}

/* ---- Checklist sections ---- */
.checklist-section {
  margin-top: calc(var(--space-unit) * 1.2);
}

.checklist-section h4 {
  font-size: 0.95rem;
  color: var(--color-text);
  margin-bottom: calc(var(--space-unit) * 0.4);
  font-weight: 600;
}

.checklist-item {
  display: flex;
  align-items: baseline;
  gap: calc(var(--space-unit) * 0.5);
  font-size: 0.9rem;
  line-height: 1.5;
  padding: calc(var(--space-unit) * 0.3) 0;
  border-radius: 0;
}

.checklist-item label {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--space-unit) * 0.35);
  cursor: pointer;
  color: var(--color-text);
}

.checklist-item input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary);
  margin: 0;
  flex-shrink: 0;
}

.checklist-item .receipt-amount {
  color: var(--color-urgency);
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
  font-size: 0.85rem;
}

/* ---- Unusual item styling ---- */
.unusual-item {
  color: var(--color-text-muted);
}

.unusual-item .why-unusual {
  color: var(--color-text-muted);
  font-size: 0.82rem;
  font-style: italic;
}

/* ---- Download area ---- */
.download-area {
  margin-top: calc(var(--space-unit) * 2);
  text-align: center;
  padding: calc(var(--space-unit) * 2);
  background: var(--color-surface);
  border-radius: 4px;
}

.download-link {
  display: inline-block;
  font-family: 'Söhne', 'Helvetica Neue', Arial, sans-serif;
  font-weight: 600;
  font-size: 1rem;
  padding: calc(var(--space-unit) * 1) calc(var(--space-unit) * 2);
  background: var(--color-primary);
  color: var(--color-bg);
  text-decoration: none;
  border-radius: 4px;
  transition: transform 150ms ease-out, background 150ms ease-out;
}

.download-link:hover,
.download-link:focus-visible {
  background: var(--color-primary-dim);
  transform: translateY(-1px);
}

/* ---- Pricing block ---- */
.pricing-block {
  margin-top: calc(var(--space-unit) * 3);
  background: var(--color-surface);
  border-radius: 4px;
  padding: calc(var(--space-unit) * 2);
  text-align: center;
}

.pricing-block .price {
  font-family: 'Söhne', 'Helvetica Neue', Arial, sans-serif;
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-text);
  margin-bottom: calc(var(--space-unit) * 0.4);
}

.pricing-block .price-description {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: calc(var(--space-unit) * 1);
}

.pricing-block .disclaimer {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: calc(var(--space-unit) * 0.5);
}

/* ---- Non-goals disclaimer ---- */
.disclaimer-section {
  margin-top: calc(var(--space-unit) * 2);
  padding: calc(var(--space-unit) * 1.5);
  background: var(--color-surface);
  border-radius: 4px;
}

.disclaimer-section h3 {
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: calc(var(--space-unit) * 0.5);
}

.disclaimer-section ul {
  list-style: none;
  padding: 0;
}

.disclaimer-section li {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  padding-left: calc(var(--space-unit) * 0.5);
  text-indent: calc(var(--space-unit) * -0.5);
}

.disclaimer-section li::before {
  content: "— ";
  color: var(--color-border);
}

/* ---- Footer ---- */
.site-footer {
  margin-top: calc(var(--space-unit) * 3);
  padding: calc(var(--space-unit) * 1.5) 0;
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  border-top: none;
}

/* ---- Utility ---- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ---- Print stylesheet ---- */
@media print {
  body {
    background: #fff;
    font-size: 11pt;
    line-height: 1.4;
  }

  .upload-zone,
  .mapping-area,
  .controls-row,
  .download-area,
  .pricing-block,
  .site-footer {
    display: none !important;
  }

  .month-block {
    break-inside: avoid;
    page-break-inside: avoid;
    background: none;
    border: 1px solid #ccc;
    padding: 8px;
    margin-bottom: 12px;
    border-radius: 2px;
  }

  .hero {
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .hero h1 { font-size: 18pt; }
  .hero p  { font-size: 11pt; }

  .month-block .checklist-item input[type="checkbox"] {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .disclaimer-section {
    display: block;
    background: none;
    border: 1px solid #ccc;
    font-size: 9pt;
  }

  @page {
    margin: 0.75in;
  }
}

/* ---- Mobile responsiveness ---- */
@media (max-width: 600px) {
  :root { --space-unit: 10px; }

  body { font-size: 15px; }

  .hero {
    text-align: center;
  }

  .hero-text p {
    margin: 0 auto calc(var(--space-unit) * 2);
  }

  .hero-image {
    margin-top: calc(var(--space-unit) * 2);
  }

  .hero h1 { font-size: 1.6rem; }

  .page { padding: 0 calc(var(--space-unit) * 1.5); }

  .month-header { flex-direction: column; }

  .month-stats { flex-wrap: wrap; }

  .controls-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .mapping-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .upload-zone {
    padding: calc(var(--space-unit) * 1.5);
  }

  .checklist-item {
    font-size: 0.85rem;
  }
}

/* ---- Shared site navigation ---- */
.site-nav {
  padding: calc(var(--space-unit) * 1.5) 0;
  margin-bottom: calc(var(--space-unit) * 1);
  border-bottom: none;
}

.nav-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 calc(var(--space-unit) * 2);
  display: flex;
  align-items: center;
  gap: calc(var(--space-unit) * 1);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: calc(var(--space-unit) * 0.5);
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1;
}

.nav-logo img {
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: calc(var(--space-unit) * 0.8);
  margin-left: auto;
  font-family: 'Söhne', 'Helvetica Neue', Arial, sans-serif;
  font-size: 0.9rem;
}

.nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  padding: calc(var(--space-unit) * 0.3) calc(var(--space-unit) * 0.5);
  border-radius: 0;
  transition: color 150ms ease-out;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--color-primary);
}

.nav-links .nav-active {
  color: var(--color-primary);
  font-weight: 600;
}

/* ---- Theme toggle ---- */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: calc(var(--space-unit) * 0.3);
  font-size: 1.1rem;
  line-height: 1;
  border-radius: 0;
  transition: transform 150ms ease-out;
  color: var(--color-text-muted);
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  transform: translateY(-1px);
}

/* ---- Section eyebrows (numbered labels above h2) ---- */
.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin: 0 0 calc(var(--space-unit) * 0.6);
  line-height: 1.4;
}

/* ---- Section headings ---- */
.section-heading {
  font-size: 1.5rem;
  margin-top: calc(var(--space-unit) * 3);
  margin-bottom: calc(var(--space-unit) * 1.5);
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.25;
}

.section-heading a {
  color: var(--color-accent);
  text-decoration: underline;
}

/* ---- Content sections ---- */
.content-section {
  margin-top: calc(var(--space-unit) * 3);
  margin-bottom: calc(var(--space-unit) * 2);
}

/* ---- Step list (vertical, not cards) ---- */
.step-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.step-list li {
  margin-bottom: calc(var(--space-unit) * 1.5);
  line-height: 1.6;
  padding-left: calc(var(--space-unit) * 2.5);
  position: relative;
}

.step-list li::before {
  content: attr(data-step);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-primary);
  font-weight: 600;
}

.step-list li:last-child {
  margin-bottom: 0;
}

/* ---- Product figure / schematic ---- */
.product-figure {
  margin: calc(var(--space-unit) * 3) auto;
  max-width: 720px;
  text-align: center;
}

.product-figure svg {
  display: block;
  margin: 0 auto;
}

.figure-labels {
  display: flex;
  justify-content: center;
  gap: calc(var(--space-unit) * 1.5);
  margin-top: calc(var(--space-unit) * 1);
  flex-wrap: wrap;
}

.figure-label {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-surface);
  padding: calc(var(--space-unit) * 0.3) calc(var(--space-unit) * 0.6);
  border-radius: 4px;
}

/* ---- Limitation list ---- */
.limitation-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.limitation-list li {
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--color-text-muted);
  padding-left: calc(var(--space-unit) * 0.8);
  margin-bottom: calc(var(--space-unit) * 0.5);
}

.limitation-list li::before {
  content: "\2014";
  color: var(--color-border);
  margin-left: calc(var(--space-unit) * -0.8);
  padding-right: calc(var(--space-unit) * 0.3);
}

/* ---- FAQ / objection ---- */
.objection-box {
  background: var(--color-surface);
  border-radius: 4px;
  padding: calc(var(--space-unit) * 1.5) calc(var(--space-unit) * 2);
  margin-top: calc(var(--space-unit) * 2);
}

.objection-box .question {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: calc(var(--space-unit) * 0.6);
}

.objection-box .answer {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ---- CTA strip ---- */
.cta-strip {
  text-align: center;
  padding: calc(var(--space-unit) * 3) 0;
  margin-top: calc(var(--space-unit) * 2);
}

.cta-strip p {
  font-size: 1.1rem;
  color: var(--color-text);
  max-width: 540px;
  margin: 0 auto calc(var(--space-unit) * 1.5);
}

/* ---- Footer ---- */
.site-footer {
  margin-top: calc(var(--space-unit) * 3);
  padding: calc(var(--space-unit) * 2) 0;
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: calc(var(--space-unit) * 1);
  margin-bottom: calc(var(--space-unit) * 0.8);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  padding: calc(var(--space-unit) * 0.2) 0;
  font-size: 0.82rem;
}

.footer-links a:hover {
  color: var(--color-primary);
}

.site-footer p {
  max-width: 540px;
  margin: 0 auto;
}

/* ---- Motion: month blocks fade in ---- */
@keyframes month-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ---- Mobile responsiveness (enhanced) ---- */
@media (max-width: 600px) {
  .nav-inner {
    flex-wrap: wrap;
    gap: calc(var(--space-unit) * 0.5);
  }

  .nav-links {
    font-size: 0.82rem;
    gap: calc(var(--space-unit) * 0.5);
  }

  .figure-labels {
    flex-direction: column;
    align-items: center;
    gap: calc(var(--space-unit) * 0.6);
  }

  .objection-box {
    padding: calc(var(--space-unit) * 1);
  }
}

/* ---- Smooth scroll ---- */
html { scroll-behavior: smooth; }