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

:root {
  --cream:      #f5edd6;
  --cream-mid:  #e8d9b0;
  --cream-dark: #d4c48a;
  --brown:      #3a2a0e;
  --brown-mid:  #7a5c2e;
  --brown-lite: #8b6914;
  --gold:       #f5c842;
  --paper:      #fff8e7;
  --red:        #a83232;
  --font-display: 'Special Elite', serif;
  --font-mono:    'Courier Prime', monospace;
}

html { scroll-behavior: smooth; }

body {
  background-color: var(--cream-mid);
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 28px, rgba(58,42,14,0.04) 28px, rgba(58,42,14,0.04) 29px),
    repeating-linear-gradient(90deg, transparent, transparent 28px, rgba(58,42,14,0.04) 28px, rgba(58,42,14,0.04) 29px);
  min-height: 100vh;
  font-family: var(--font-mono);
  color: var(--brown);
  overflow-x: hidden;
}

/* ─── Nav ─── */
nav {
  background: var(--brown);
  border-bottom: 3px solid var(--brown-lite);
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 200;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--gold);
  letter-spacing: 2px;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 0;
  list-style: none;
}

.nav-links li a {
  display: block;
  padding: 0 16px;
  height: 56px;
  line-height: 56px;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--cream-mid);
  text-decoration: none;
  border-left: 1px solid rgba(255,255,255,0.08);
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.nav-links li a:hover,
.nav-links li a.active {
  background: var(--brown-lite);
  color: var(--gold);
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  height: 2px;
  background: var(--gold);
  border-radius: 2px;
}

.nav-drawer {
  display: none;
  flex-direction: column;
  position: absolute;
  top: 56px;
  left: 0;
  right: 0;
  background: var(--brown);
  border-bottom: 3px solid var(--brown-lite);
  z-index: 199;
}

.nav-drawer.open { display: flex; }

.nav-drawer a {
  display: block;
  padding: 14px 20px;
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--cream-mid);
  text-decoration: none;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.nav-drawer a.active,
.nav-drawer a:hover {
  background: var(--brown-lite);
  color: var(--gold);
}

/* ─── Main Layout ─── */
.container {
  max-width: 780px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 4rem;
}

/* ─── Converter Card ─── */
.card {
  background: var(--cream);
  border: 3px solid var(--brown);
  border-radius: 4px;
  padding: 1.75rem;
  box-shadow: 6px 6px 0 var(--brown);
  margin-bottom: 2rem;
}

.card-header {
  text-align: center;
  border-bottom: 2px dashed var(--brown-lite);
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
}

.card-header h1 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 400;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--brown);
  margin-bottom: 4px;
}

.card-header p {
  font-size: 11px;
  color: var(--brown-mid);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.field-label {
  display: block;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--brown-mid);
  margin-bottom: 6px;
}

.hex-row {
  display: flex;
  margin-bottom: 4px;
}

.prefix-badge {
  background: var(--brown-lite);
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  padding: 12px 14px;
  border: 2px solid var(--brown-lite);
  border-right: none;
  border-radius: 2px 0 0 2px;
  user-select: none;
  line-height: 1;
  flex-shrink: 0;
}

.hex-input {
  flex: 1;
  min-width: 0;
  background: var(--paper);
  border: 2px solid var(--brown-lite);
  border-radius: 0 2px 2px 0;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--brown);
  letter-spacing: 3px;
  text-transform: uppercase;
  outline: none;
  transition: border-color 0.15s, background 0.15s;
  font-size: clamp(16px, 4vw, 20px);
}

.hex-input:focus {
  border-color: var(--brown);
  background: #fffef5;
}

.hex-input::placeholder {
  color: var(--cream-dark);
  font-weight: 400;
  letter-spacing: 1px;
  text-transform: none;
}

.error-msg {
  color: var(--red);
  font-size: 11px;
  letter-spacing: 1px;
  min-height: 18px;
  margin-bottom: 1rem;
}

/* ─── Output ─── */
.output-box {
  background: var(--brown);
  border: 2px solid var(--brown);
  border-radius: 2px;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.output-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 8px 0;
  gap: 8px;
}

.output-row + .output-row {
  border-top: 1px solid rgba(255,255,255,0.08);
}

.output-row.highlight {
  border-top: 1px dashed var(--brown-lite) !important;
  padding-top: 10px;
  margin-top: 4px;
}

.output-key {
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #c5aa72;
  white-space: nowrap;
  flex-shrink: 0;
}

.output-val {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--cream);
  letter-spacing: 1px;
  text-align: right;
  word-break: break-all;
}

.output-val.big {
  font-size: clamp(18px, 5vw, 24px);
  color: var(--gold);
}

/* ─── Bit Grid ─── */
.section-label {
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--brown-mid);
  margin-bottom: 8px;
}

.bit-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 6px;
}

.bit {
  width: 24px;
  height: 24px;
  border: 1.5px solid var(--brown-lite);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--cream-dark);
  background: var(--paper);
  transition: background 0.1s, color 0.1s;
}

.bit.on {
  background: var(--brown-lite);
  color: var(--cream);
}

.bit-count {
  font-size: 11px;
  color: var(--brown-mid);
  letter-spacing: 1px;
  margin-bottom: 1.5rem;
}

/* ─── FAQ Section ─── */
.faq-section {
  background: var(--cream);
  border: 2px solid var(--brown);
  border-radius: 2px;
  padding: 1.5rem;
  box-shadow: 4px 4px 0 var(--brown);
  margin-bottom: 2rem;
}

.faq-section h2 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 400;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 1rem;
  border-bottom: 1px dashed var(--brown-lite);
  padding-bottom: 0.5rem;
  color: var(--brown);
}

.faq-item { margin-bottom: 1rem; }
.faq-item:last-child { margin-bottom: 0; }
.faq-q { font-size: 13px; font-weight: 700; color: var(--brown); margin-bottom: 4px; }
.faq-a { font-size: 13px; color: var(--brown-mid); line-height: 1.65; }

/* ─── Footer ─── */
footer {
  text-align: center;
  padding: 2rem 1rem;
  border-top: 2px dashed var(--brown-lite);
  font-size: 11px;
  color: var(--brown-mid);
  letter-spacing: 1px;
}

footer a { color: var(--brown-lite); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* ─── About Page ─── */
.about-hero {
  text-align: center;
  padding: 2.5rem 0 1.75rem;
  border-bottom: 2px dashed var(--brown-lite);
  margin-bottom: 2rem;
}

.about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(22px, 6vw, 32px);
  font-weight: 400;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.about-hero p { font-size: 14px; color: var(--brown-mid); max-width: 480px; margin: 0 auto; line-height: 1.7; }

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.about-card {
  background: var(--cream);
  border: 2px solid var(--brown);
  border-radius: 2px;
  padding: 1.25rem;
  box-shadow: 4px 4px 0 var(--brown);
}

.about-card h3 {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  color: var(--brown);
}

.about-card p { font-size: 13px; color: var(--brown-mid); line-height: 1.6; }

.about-prose {
  background: var(--cream);
  border: 2px solid var(--brown);
  border-radius: 2px;
  padding: 1.5rem;
  box-shadow: 6px 6px 0 var(--brown);
  margin-bottom: 2rem;
}

.about-prose h2 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 400;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 1rem;
  border-bottom: 1px dashed var(--brown-lite);
  padding-bottom: 0.5rem;
}

.about-prose p { font-size: 14px; line-height: 1.75; color: var(--brown-mid); margin-bottom: 1rem; }
.about-prose p:last-child { margin-bottom: 0; }

.table-wrap { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; margin-top: 1rem; }

.example-table { width: 100%; min-width: 380px; border-collapse: collapse; font-size: 13px; }

.example-table th {
  background: var(--brown);
  color: var(--gold);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 8px 10px;
  text-align: left;
  white-space: nowrap;
}

.example-table td {
  padding: 7px 10px;
  border-bottom: 1px solid var(--cream-mid);
  font-family: var(--font-mono);
  color: var(--brown);
  white-space: nowrap;
}

.example-table tr:nth-child(even) td { background: var(--paper); }

/* ─── Legal Page ─── */
.legal-header {
  text-align: center;
  padding: 2rem 0 1.5rem;
  border-bottom: 2px dashed var(--brown-lite);
  margin-bottom: 2rem;
}

.legal-header h1 {
  font-family: var(--font-display);
  font-size: clamp(20px, 6vw, 28px);
  font-weight: 400;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.legal-header p { font-size: 12px; color: var(--brown-mid); letter-spacing: 1px; }

.legal-tabs {
  display: flex;
  border-bottom: 2px solid var(--brown);
  margin-bottom: 1.5rem;
  overflow-x: auto;
}

.legal-tab {
  padding: 10px 16px;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  border: 2px solid transparent;
  border-bottom: none;
  background: transparent;
  font-family: var(--font-mono);
  color: var(--brown-mid);
  transition: background 0.15s, color 0.15s;
  margin-bottom: -2px;
  white-space: nowrap;
}

.legal-tab.active {
  background: var(--cream);
  border-color: var(--brown);
  border-bottom-color: var(--cream);
  color: var(--brown);
  font-weight: 700;
}

.legal-tab:hover:not(.active) { background: var(--cream-mid); }
.legal-content { display: none; }
.legal-content.active { display: block; }

.legal-section {
  background: var(--cream);
  border: 2px solid var(--brown);
  border-radius: 2px;
  padding: 1.5rem;
  box-shadow: 4px 4px 0 var(--brown);
  margin-bottom: 1.5rem;
}

.legal-section h2 {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  color: var(--brown);
}

.legal-section p,
.legal-section li { font-size: 13px; line-height: 1.75; color: var(--brown-mid); margin-bottom: 0.5rem; }
.legal-section ul { padding-left: 1.25rem; margin-bottom: 0.5rem; }
.legal-section li { margin-bottom: 4px; }

.effective-badge {
  display: inline-block;
  background: var(--brown);
  color: var(--gold);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 2px;
  margin-bottom: 1rem;
}

/* ─── Learn Page ─── */
.learn-hero {
  text-align: center;
  padding: 2.5rem 0 1.75rem;
  border-bottom: 2px dashed var(--brown-lite);
  margin-bottom: 2rem;
}

.learn-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(22px, 6vw, 32px);
  font-weight: 400;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.learn-hero p { font-size: 14px; color: var(--brown-mid); max-width: 520px; margin: 0 auto; line-height: 1.7; }

.article-card {
  background: var(--cream);
  border: 2px solid var(--brown);
  border-radius: 2px;
  padding: 2rem;
  box-shadow: 6px 6px 0 var(--brown);
  margin-bottom: 2.5rem;
}

.article-card h2 {
  font-family: var(--font-display);
  font-size: clamp(18px, 4vw, 24px);
  font-weight: 400;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--brown);
  margin-bottom: 0.5rem;
  border-bottom: 1px dashed var(--brown-lite);
  padding-bottom: 0.75rem;
}

.article-meta {
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--brown-mid);
  margin-bottom: 1.25rem;
}

.article-card h3 {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--brown);
  margin: 1.5rem 0 0.5rem;
}

.article-card p { font-size: 14px; line-height: 1.8; color: var(--brown-mid); margin-bottom: 1rem; }
.article-card p:last-child { margin-bottom: 0; }

.article-card ul, .article-card ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.article-card li { font-size: 14px; line-height: 1.75; color: var(--brown-mid); margin-bottom: 0.4rem; }

.article-card code {
  background: var(--brown);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 2px 6px;
  border-radius: 2px;
}

.article-card .inline-table-wrap { width: 100%; overflow-x: auto; margin: 1rem 0; }

.article-card table { width: 100%; min-width: 320px; border-collapse: collapse; font-size: 13px; }
.article-card table th {
  background: var(--brown);
  color: var(--gold);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 8px 10px;
  text-align: left;
}
.article-card table td { padding: 7px 10px; border-bottom: 1px solid var(--cream-mid); font-family: var(--font-mono); color: var(--brown); }
.article-card table tr:nth-child(even) td { background: var(--paper); }

/* ─── Color Converter Page ─── */
.color-swatch {
  width: 100%;
  height: 120px;
  border-radius: 2px;
  border: 2px solid var(--brown);
  margin-bottom: 1rem;
  transition: background-color 0.2s;
  background: #1a3f6f;
}

.color-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.color-info-box {
  background: var(--brown);
  border-radius: 2px;
  padding: 0.75rem;
  text-align: center;
}

.color-info-box .cib-label {
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #c5aa72;
  margin-bottom: 4px;
}

.color-info-box .cib-val {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--gold);
}

.color-picker-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.color-picker-row label {
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--brown-mid);
}

input[type="color"] {
  width: 52px;
  height: 40px;
  border: 2px solid var(--brown-lite);
  border-radius: 2px;
  background: none;
  cursor: pointer;
  padding: 2px;
}

.divider {
  text-align: center;
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--brown-mid);
  margin: 1.5rem 0;
  border-top: 1px dashed var(--brown-lite);
  padding-top: 1.5rem;
}

.color-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 0.5rem;
}

.preset-swatch {
  width: 36px;
  height: 36px;
  border-radius: 2px;
  border: 2px solid var(--brown);
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
  flex-shrink: 0;
}

.preset-swatch:hover { transform: scale(1.15); box-shadow: 2px 2px 0 var(--brown); }

/* ─── Mobile ─── */
@media (max-width: 600px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }

  .container { padding: 1rem 0.75rem 3rem; max-width: 100%; }
  .card { padding: 1.25rem 1rem; box-shadow: 3px 3px 0 var(--brown); }
  .card-header h1 { font-size: 20px; letter-spacing: 2px; }
  .prefix-badge { font-size: 16px; padding: 12px 10px; }

  .output-row { flex-direction: column; gap: 2px; }
  .output-val { text-align: left; font-size: 15px; }
  .output-val.big { font-size: 22px; }

  .bit { width: 20px; height: 20px; font-size: 10px; }
  .about-hero { padding: 1.5rem 0 1.25rem; }
  .about-prose { padding: 1.25rem 1rem; box-shadow: 3px 3px 0 var(--brown); }
  .legal-section { padding: 1.25rem 1rem; box-shadow: 3px 3px 0 var(--brown); }
  .article-card { padding: 1.25rem 1rem; box-shadow: 3px 3px 0 var(--brown); }
}

@media (max-width: 380px) {
  .nav-logo { font-size: 17px; }
  .card-header h1 { font-size: 17px; }
}