/* ============================================
   Merkhutu.com — Design System & Styles
   ============================================ */

/* ─── CSS Variables ─── */
:root {
  --color-green: #12372A;
  --color-gold: #C9A227;
  --color-sand: #F5EEDC;
  --color-charcoal: #1D1D1B;
  --color-clay: #8A5A36;
  --color-ivory: #FFFDF5;
  --color-white: #FFFFFF;
  --color-gold-light: #E8D5A3;
  --color-green-light: #1E5242;

  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', system-ui, sans-serif;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.14);

  --max-width: 1200px;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--color-charcoal);
  background-color: var(--color-ivory);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-green);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-gold);
}

/* ─── Typography ─── */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-green);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: 1.125rem; }

p {
  margin-bottom: var(--space-sm);
}

/* ─── Utilities ─── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-lg) 0;
}

.section-alt {
  background-color: var(--color-sand);
}

.text-center {
  text-align: center;
}

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

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.75rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  border: 2px solid transparent;
}

.btn-primary {
  background-color: var(--color-green);
  color: var(--color-ivory);
  border-color: var(--color-green);
}

.btn-primary:hover {
  background-color: var(--color-green-light);
  border-color: var(--color-green-light);
  color: var(--color-ivory);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-green);
  border-color: var(--color-green);
}

.btn-secondary:hover {
  background-color: var(--color-green);
  color: var(--color-ivory);
}

.btn-gold {
  background-color: var(--color-gold);
  color: var(--color-charcoal);
  border-color: var(--color-gold);
}

.btn-gold:hover {
  background-color: #B08E1F;
  border-color: #B08E1F;
  color: var(--color-charcoal);
}

/* ─── Header ─── */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 253, 245, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(18, 55, 42, 0.08);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-green);
  letter-spacing: -0.02em;
}

.nav {
  display: none;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--space-md);
}

.nav-list a {
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--color-charcoal);
  position: relative;
}

.nav-list a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-gold);
  transition: width 0.3s ease;
}

.nav-list a:hover::after {
  width: 100%;
}

.nav-list a:hover {
  color: var(--color-green);
}

.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-green);
  transition: all 0.3s ease;
}

/* ─── Mobile Nav ─── */
.mobile-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: var(--color-ivory);
  border-bottom: 1px solid rgba(18, 55, 42, 0.1);
  padding: var(--space-md);
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  z-index: 999;
}

.mobile-nav.active {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}

.mobile-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.mobile-nav a {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-charcoal);
  display: block;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(18, 55, 42, 0.06);
}

/* ─── Hero ─── */
.hero {
  padding: var(--space-xl) 0;
  background: linear-gradient(135deg, var(--color-ivory) 0%, var(--color-sand) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 200%;
  background: radial-gradient(circle, rgba(201, 162, 39, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  margin-bottom: var(--space-sm);
}

.hero-subheadline {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  color: var(--color-clay);
  margin-bottom: var(--space-md);
  max-width: 540px;
  line-height: 1.5;
}

.hero-buttons {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
  z-index: 1;
}

.currency-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(201, 162, 39, 0.2);
  position: relative;
  overflow: hidden;
}

.currency-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-green));
}

.currency-card-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--color-green);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.currency-card-icon {
  width: 32px;
  height: 32px;
  background-color: var(--color-gold);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  color: var(--color-white);
}

.currency-card-row {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(18, 55, 42, 0.08);
  font-size: 0.9375rem;
}

.currency-card-row:last-child {
  border-bottom: none;
}

.currency-card-label {
  color: var(--color-clay);
  font-weight: 500;
}

.currency-card-value {
  font-weight: 600;
  color: var(--color-green);
}

/* ─── Section Headers ─── */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-lg);
}

.section-header h2 {
  margin-bottom: var(--space-xs);
}

.section-header p {
  color: var(--color-clay);
  font-size: 1.125rem;
}

/* ─── Cards ─── */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.card {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(18, 55, 42, 0.06);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.card-icon {
  width: 48px;
  height: 48px;
  background-color: var(--color-sand);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-sm);
  font-size: 1.25rem;
}

.card h3 {
  margin-bottom: var(--space-xs);
  font-size: 1.25rem;
}

.card p {
  color: var(--color-clay);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 0;
}

/* ─── Conversion Ladder ─── */
.ladder {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

.ladder::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold), var(--color-green));
  opacity: 0.3;
}

.ladder-step {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  position: relative;
}

.ladder-step:first-child {
  padding-top: 0;
}

.ladder-step:last-child {
  padding-bottom: 0;
}

.ladder-marker {
  width: 50px;
  height: 50px;
  background-color: var(--color-white);
  border: 2px solid var(--color-gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--color-green);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.ladder-step.highlight .ladder-marker {
  background-color: var(--color-green);
  border-color: var(--color-green);
  color: var(--color-gold);
}

.ladder-content {
  flex: 1;
  padding-top: 0.5rem;
}

.ladder-content h4 {
  font-size: 1.125rem;
  margin-bottom: 0.25rem;
  color: var(--color-green);
}

.ladder-content p {
  font-size: 0.9375rem;
  color: var(--color-clay);
  margin-bottom: 0;
}

/* ─── Denomination Cards ─── */
.denomination-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.denomination-card {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(18, 55, 42, 0.06);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.denomination-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background-color: var(--color-gold);
}

.denomination-card.unchecked::before {
  background-color: var(--color-clay);
}

.denomination-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-xs);
}

.denomination-card .value {
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-gold);
  margin-bottom: var(--space-xs);
}

.denomination-card p {
  font-size: 0.875rem;
  color: var(--color-clay);
  margin-bottom: 0;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: var(--space-xs);
}

.badge-review {
  background-color: rgba(138, 90, 54, 0.1);
  color: var(--color-clay);
}

/* ─── Region Cards ─── */
.region-card {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(18, 55, 42, 0.06);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.region-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.region-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.region-card ul {
  list-style: none;
  margin-bottom: var(--space-sm);
}

.region-card li {
  padding: 0.375rem 0;
  font-size: 0.9375rem;
  color: var(--color-clay);
  border-bottom: 1px solid rgba(18, 55, 42, 0.04);
}

.region-card li:last-child {
  border-bottom: none;
}

.region-card .link {
  font-weight: 600;
  font-size: 0.9375rem;
}

/* ─── Table ─── */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(18, 55, 42, 0.06);
}

.table-wrapper table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-white);
  min-width: 600px;
}

.table-wrapper thead {
  background-color: var(--color-green);
  color: var(--color-ivory);
}

.table-wrapper th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.9375rem;
  white-space: nowrap;
}

.table-wrapper td {
  padding: 1rem;
  font-size: 0.9375rem;
  border-bottom: 1px solid rgba(18, 55, 42, 0.06);
  color: var(--color-charcoal);
}

.table-wrapper tbody tr:nth-child(even) {
  background-color: rgba(245, 238, 220, 0.4);
}

.table-wrapper tbody tr:hover {
  background-color: rgba(245, 238, 220, 0.8);
}

/* ─── Accordion ─── */
.accordion {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(18, 55, 42, 0.06);
}

.accordion-item {
  background-color: var(--color-white);
  border-bottom: 1px solid rgba(18, 55, 42, 0.06);
}

.accordion-item:last-child {
  border-bottom: none;
}

.accordion-header {
  width: 100%;
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-green);
  text-align: left;
}

.accordion-header:hover {
  background-color: rgba(245, 238, 220, 0.4);
}

.accordion-icon {
  width: 24px;
  height: 24px;
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: var(--space-sm);
}

.accordion-item.active .accordion-icon {
  transform: rotate(180deg);
}

.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.accordion-item.active .accordion-body {
  max-height: 2000px;
  padding: 0 1.25rem 1.25rem;
}

.accordion-body ul {
  list-style: none;
  columns: 1;
}

.accordion-body li {
  padding: 0.5rem 0;
  font-size: 0.9375rem;
  color: var(--color-charcoal);
  border-bottom: 1px solid rgba(18, 55, 42, 0.04);
  break-inside: avoid;
}

.accordion-body li:last-child {
  border-bottom: none;
}

.accordion-body .currency-note {
  margin-top: var(--space-sm);
  padding: var(--space-sm);
  background-color: var(--color-sand);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--color-clay);
}

/* ─── CTA Section ─── */
.cta-section {
  background-color: var(--color-green);
  color: var(--color-ivory);
  text-align: center;
  padding: var(--space-xl) 0;
}

.cta-section h2 {
  color: var(--color-gold);
  margin-bottom: var(--space-sm);
}

.cta-section p {
  color: rgba(245, 238, 220, 0.85);
  font-size: 1.125rem;
  margin-bottom: var(--space-md);
}

/* ─── Footer ─── */
.footer {
  background-color: var(--color-charcoal);
  color: rgba(255, 253, 245, 0.7);
  padding: var(--space-lg) 0 var(--space-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--color-gold);
  margin-bottom: var(--space-xs);
}

.footer p {
  font-size: 0.9375rem;
  line-height: 1.6;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  color: rgba(255, 253, 245, 0.7);
  font-size: 0.9375rem;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 253, 245, 0.1);
  padding-top: var(--space-md);
  text-align: center;
  font-size: 0.875rem;
  color: rgba(255, 253, 245, 0.5);
}

/* ─── Info Card ─── */
.info-card {
  background-color: var(--color-sand);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
  margin-bottom: var(--space-lg);
  border: 1px solid rgba(201, 162, 39, 0.2);
}

.info-card p {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--color-green);
  margin-bottom: 0;
}

/* ─── Responsive ─── */
@media (min-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .denomination-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .accordion-body ul {
    columns: 2;
  }
}

@media (min-width: 768px) {
  .nav {
    display: flex;
    align-items: center;
    gap: var(--space-md);
  }

  .mobile-menu-toggle {
    display: none;
  }

  .hero .container {
    grid-template-columns: 1fr 1fr;
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr;
  }
}

@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .denomination-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .region-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .accordion-body ul {
    columns: 3;
  }
}