@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap');

:root {
  --bg-color: #fcfcfc;
  --text-primary: #1a1a1a;
  --text-secondary: #595959;
  --border-color: #e5e5e5;
  --card-bg: #ffffff;
  --hover-bg: #f5f5f7;
  --accent: #000000;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --transition: all 0.2s ease;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 1.75rem;
}

h3 {
  font-size: 1.25rem;
}

p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 800px;
  margin-bottom: 1.5rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  text-decoration: underline;
}

/* Header & Nav */
.site-header {
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.site-logo {
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  z-index: 102;
}

.site-logo:hover {
  text-decoration: none;
}

.burger-menu {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 102;
  flex-direction: column;
  gap: 5px;
}

.burger-icon {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}

.main-nav a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
}

.main-nav a:hover {
  color: var(--text-primary);
  text-decoration: none;
}

/* Page Container & Layout */
.page-container {
  max-width: 1200px;
  margin: 3rem auto;
  padding: 0 2rem;
}

.page-layout {
  display: flex;
  gap: 2rem;
  flex-direction: column;
}

.main-content {
  flex: 1;
  min-width: 0; /* Prevents overflow in flex child */
}

.ad-sidebar {
  width: 100%;
}

/* Breadcrumbs */
.breadcrumb-trail {
  margin-bottom: 2rem;
}

.breadcrumb-trail ol {
  list-style: none;
  display: flex;
  gap: 0.75rem;
  padding: 0;
  margin: 0;
  font-size: 0.875rem;
  font-weight: 500;
}

.breadcrumb-trail a {
  color: var(--text-secondary);
}

.breadcrumb-trail a:hover {
  color: var(--text-primary);
  text-decoration: none;
}

.breadcrumb-trail span[aria-current="page"] {
  color: var(--text-primary);
}

.breadcrumb-trail .separator {
  color: #ccc;
}

/* Interactive Calculator */
.calculator {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  background-color: var(--card-bg);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  margin-bottom: 2rem;
}

.calculator input[type="number"] {
  padding: 0.75rem;
  font-size: 1.1rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  width: 150px;
}

.calculator label {
  font-weight: 500;
  color: var(--text-primary);
}

.calculator output {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.calculator button[type="submit"] {
  padding: 0.75rem 1.5rem;
  background-color: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  margin-left: auto;
}

.calculator button[type="submit"]:hover {
  background-color: #333;
}

/* Tables (Conversions) */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2rem 0;
  background-color: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

th, td {
  padding: 1.25rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  background-color: var(--hover-bg);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

tr:last-child td {
  border-bottom: none;
}

tbody tr {
  transition: var(--transition);
}

tbody tr:hover {
  background-color: var(--hover-bg);
}

/* FAQs */
dl {
  margin: 2rem 0;
  display: grid;
  gap: 1.5rem;
}

dt {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

dd {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
}

/* Lists */
ul:not(.converter-list):not(.main-nav ul) {
  padding-left: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

ul:not(.converter-list):not(.main-nav ul) li {
  margin-bottom: 0.75rem;
}

/* Converter List (Cards) */
.converter-list {
  list-style: none;
  padding: 0;
  margin: 2rem 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.converter-list li {
  margin: 0;
}

.converter-list a {
  display: flex;
  align-items: center;
  padding: 1.5rem;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-weight: 500;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.converter-list a:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: #d1d1d6;
  text-decoration: none;
}

.converter-list a::after {
  content: "→";
  margin-left: auto;
  color: var(--text-secondary);
  font-size: 1.25rem;
  transition: var(--transition);
}

.converter-list a:hover::after {
  color: var(--text-primary);
  transform: translateX(4px);
}

/* Ad Containers */
.ad-container {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--hover-bg);
  border: 1px dashed var(--border-color);
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin: 2rem 0;
  text-align: center;
  border-radius: var(--radius);
  overflow: hidden;
}
.ad-container::before {
  content: "Advertisement";
}

.ad-top, .ad-bottom {
  width: 100%;
  min-height: 90px;
}

.ad-sidebar-banner {
  width: 100%;
  min-height: 250px;
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: var(--card-bg);
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  border-top: 1px solid var(--border-color);
  padding: 1.5rem;
}

.cookie-banner-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (min-width: 768px) {
  .cookie-banner-content {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
  .cookie-banner-content p {
    margin-bottom: 0;
  }
}

.cookie-banner p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.cookie-banner-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.cookie-btn {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.cookie-btn-primary {
  background-color: var(--accent);
  color: #fff;
}

.cookie-btn-primary:hover {
  background-color: #333;
}

.cookie-btn-secondary {
  background-color: var(--hover-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.cookie-btn-secondary:hover {
  background-color: #e5e5e5;
}

/* Cookie Modal */
.cookie-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 1001;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cookie-modal-content {
  background-color: var(--card-bg);
  border-radius: var(--radius);
  padding: 2rem;
  width: 90%;
  max-width: 500px;
  box-shadow: var(--shadow-md);
  position: relative;
}

.cookie-modal-close {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
}

.cookie-modal-close:hover {
  color: var(--text-primary);
}

.cookie-option {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.cookie-option:last-of-type {
  border-bottom: none;
}

.cookie-option-info h3 {
  margin-top: 0;
  margin-bottom: 0.25rem;
  font-size: 1rem;
}

.cookie-option-info p {
  margin-bottom: 0;
  font-size: 0.85rem;
}

.cookie-modal-buttons {
  margin-top: 2rem;
  display: flex;
  justify-content: flex-end;
}

/* Toggle Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
}

input:checked + .slider {
  background-color: var(--accent);
}

input:disabled + .slider {
  background-color: #888;
  cursor: not-allowed;
}

input:checked + .slider:before {
  transform: translateX(20px);
}

.slider.round {
  border-radius: 24px;
}

.slider.round:before {
  border-radius: 50%;
}


/* Footer */
.site-footer {
  text-align: center;
  padding: 3rem 2rem;
  margin-top: 4rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Media Queries for Responsiveness */
@media (min-width: 768px) {
  .page-layout {
    flex-direction: row;
  }

  .ad-sidebar {
    width: 300px;
    flex-shrink: 0;
  }

  .ad-sidebar-banner {
    min-height: 600px; /* Taller banner for desktop sidebars */
    position: sticky;
    top: 100px;
  }
}

@media (max-width: 767px) {
  .calculator {
    padding: 1.5rem;
    gap: 0.5rem;
  }

  .calculator input[type="number"] {
    width: 100px;
  }

  .calculator button[type="submit"] {
    width: 100%;
    margin-left: 0;
    margin-top: 0.5rem;
  }

  .site-header {
    padding: 1rem;
  }

  .burger-menu {
    display: flex;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    padding: 1rem 0;
    z-index: 101;
  }

  .main-nav.active {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 1rem;
    align-items: center;
  }

  /* Burger Animation */
  .burger-menu.active .burger-icon:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .burger-menu.active .burger-icon:nth-child(2) {
    opacity: 0;
  }
  .burger-menu.active .burger-icon:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
}