:root {
  --color-deep-ocean: #030f1c;
  --color-ocean: #011829;
  --color-sea: #4da2ff;
  --color-aqua: #c0e6ff;
  --color-cloud: #ffffff;

  --card-padding: 2em;
  --card-content-gap: 0.5em;
  --border-radius: 1em;
}

body {
  background: var(--color-deep-ocean);
  color: var(--color-cloud);
  font-family: 'Inter', sans-serif;
  margin: 0;
  padding: 100px 0 8em 0; /* Add top padding for fixed header */
  font-weight: 400;
  line-height: 1.55;
  font-size: 16px;
}

/* Responsive Typography */
@media (max-width: 768px) {
  body {
    font-size: 14px;
    padding-top: 80px; /* Adjust for smaller fixed header on mobile */
  }
}

h1, h2, h3 {
  font-weight: 500;
  line-height: 1.35;
}

h1 {
  font-size: 56px;
}

h2 {
  font-size: 48px;
}

h3 {
  font-size: 24px;
}

/* Responsive Typography */
@media (max-width: 768px) {
  h1 {
    font-size: 36px;
  }
  
  h2 {
    font-size: 32px;
  }
  
  h3 {
    font-size: 20px;
  }
}

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 1em 0;
  border-bottom: 1px solid var(--color-ocean);
  background: rgba(3, 15, 28, 0.8); /* Semi-transparent deep ocean */
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px); /* Safari support */
  z-index: 1001;
}

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

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: inherit;
}

.nav-logo:hover {
  opacity: 0.8;
  transition: opacity 0.3s ease;
}

.logo-icon {
  width: 3em;
  height: 3em;
  margin-right: 0.5em;
}

.logo-text {
  font-size: 1.25em;
  color: var(--color-cloud);
  font-weight: 700;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  color: var(--color-cloud);
  text-decoration: none;
  display: flex;
  align-items: center;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  outline: none;
  color: var(--color-cloud);
  cursor: pointer;
  align-items: center;
  gap: 0.5em;
  padding: 0.5em 1.5em;
  border-radius: 1000px;
  font-family: inherit;
  font-weight: 500;
}

.mobile-menu-btn:focus {
  outline: none;
}

.mobile-menu-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

.mobile-menu-btn .arrow-icon {
  filter: brightness(0) invert(1); /* White color */
  transition: transform 0.3s ease;
  width: 2em;
  height: 2em;
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--color-deep-ocean);
    flex-direction: column;
    gap: 1em;
    padding: 2em;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    overflow: hidden;
    height: auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  }
  
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .nav-dropdown .arrow-icon {
    transform: rotate(0deg);
  }
}

.btn {
  padding: 0.5em 1.5em;
  border-radius: 2em;
  line-height: 100%;
  text-decoration: none;
  font-weight: 500;
  display: flex;
  align-items: center;
  height: 48px;
  box-sizing: border-box;
}

.nav .btn {
  padding: 1em;
  height: 32px;
}

.btn:hover {
  background: var(--color-aqua);
  color: var(--color-deep-ocean);
  border: 1px solid var(--color-aqua);
}

.btn-primary {
  background: var(--color-sea);
  color: var(--color-cloud);
  border: 1px solid var(--color-sea);
}

.btn-secondary {
  background: var(--color-ocean);
  color: var(--color-cloud);
  border: 1px solid var(--color-ocean);
}

.hero {
  position: relative;
  padding: 4em 0 12em 0;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 1em;      /* Match container padding */
  right: 1em;     /* Match container padding */
  bottom: 0;
  /* Remove width: 100% */
  background-image: url('assets/img/background.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.5;
  border-radius: 2em;
}

.hero-background::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-aqua);
  mix-blend-mode: multiply;
  border-radius: 2em;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1em;
  position: relative;
}

/* Responsive Container */
@media (max-width: 768px) {
  .container {
    padding: 0 1.5em;
  }
}

/* Section Scroll Margins for Fixed Header */
section[id] {
  scroll-margin-top: 120px;
}

@media (max-width: 768px) {
  section[id] {
    scroll-margin-top: 100px;
  }
}

.hero-title {
  margin-bottom: var(--card-content-gap);
  max-width: 65%;
}

.hero-description {
  max-width: 65%;
  margin: 0 0 3em 0;
}

.hero-buttons {
  display: flex;
  gap: 1em;
}

/* Responsive Hero */
@media (max-width: 768px) {
  .hero {
    padding: 1em 2em 4em 2em;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .hero-description {
    margin: 0 0 2em 0;
  }
}

.how-it-works {
  padding: 2em 0;
}

.section-title {
  text-align: center;
  margin-bottom: 1em;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1em;
}

/* Responsive Grids */
@media (max-width: 768px) {
  .cards-grid {
    grid-template-columns: 1fr;
  }
  
  .how-it-works .card,
  .user-roles .feature-card {
    height: auto;
    min-height: 200px;
  }
  
  .why-suistrategy .features-grid {
    grid-template-columns: 1fr;
  }
  
  .why-suistrategy .feature-card {
    min-height: auto;
  }
  
  .protocol-tokens .card {
    padding-bottom: 2em;
  }
  
  .features .feature-card,
  .roadmap .card {
    padding: 1.5em;
  }
}

.card {
  background: var(--color-ocean);
  padding: var(--card-padding);
  border-radius: var(--border-radius);
  border: none;
  outline: none;
  display: flex;
  flex-direction: column;
  gap: var(--card-content-gap);
}

/* Fixed height only for specific sections */
.how-it-works .card,
.user-roles .feature-card {
  height: 300px;
}

/* Protocol tokens with larger bottom padding */
.protocol-tokens .card {
  padding-bottom: 3em;
}

.card-number {
  color: var(--color-aqua);
}

.card-title {
  color: var(--color-sea);
  margin: 0;
}

.features {
  padding: 2em 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1em;
}

/* Responsive Features Grid */
@media (max-width: 1024px) and (min-width: 769px) {
  .features-grid {
    grid-template-columns: 1fr;
    gap: 1.5em;
  }
  
  .cards-grid {
    gap: 1.5em;
  }
}

@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  background: var(--color-ocean);
  padding: var(--card-padding);
  border-radius: var(--border-radius);
  border: none;
  outline: none;
  display: flex;
  flex-direction: column;
  gap: var(--card-content-gap);
}

/* Protocol features as full-width rows */
.features .features-grid {
  display: flex;
  flex-direction: column;
  gap: 1em;
}

.features .feature-card {
  width: 100%;
  padding: 2em;
}

/* Why SuiStrategy - equal height columns */
.why-suistrategy .features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1em;
  align-items: stretch;
}

.why-suistrategy .feature-card {
  height: auto;
  min-height: 250px;
}

/* Roadmap vertical stacked */
.roadmap .cards-grid {
  display: flex;
  flex-direction: column;
  gap: 1em;
}

.roadmap .card {
  width: 100%;
  height: auto;
  padding: 2em;
}

.feature-title {
  color: var(--color-sea);
  margin: 0;
}

.faq {
  padding: 2em 0;
}

.faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1em;
}

.faq-item {
  background: var(--color-ocean);
  border-radius: var(--border-radius);
  border: none;
  outline: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-aqua);
  padding: var(--card-padding);
  cursor: pointer;
  list-style: none;
}

.faq-label {
  font-weight: 500;
}

/* Arrow icon styling */
.arrow-icon {
  width: 2em;
  height: 2em;
  margin-left: 0.5em;
  transition: transform 0.3s ease;
}

/* Button arrow styling - match button colors */
.btn-primary .arrow-icon {
  filter: brightness(0) invert(1); /* White color to match button text */
}

.btn-secondary .arrow-icon {
  filter: brightness(0) invert(1); /* White color to match button text */
}

.btn:hover .arrow-icon {
  filter: brightness(0) saturate(100%) invert(8%) sepia(59%) saturate(3151%) hue-rotate(200deg) brightness(97%) contrast(96%); /* Dark blue to match hover text */
}

/* Navigation dropdown arrow */
.nav-dropdown .arrow-icon {
  filter: brightness(0) invert(1); /* White color */
  transform: rotate(90deg); /* Point down for dropdown */
}

/* FAQ arrow styling */
.faq-arrow {
  width: 2em;
  height: 2em;
  transition: transform 0.3s ease;
  filter: brightness(0) saturate(100%) invert(76%) sepia(46%) saturate(434%) hue-rotate(178deg) brightness(104%) contrast(101%); /* Aqua color */
}

.faq-item[open] .faq-arrow {
  transform: rotate(90deg); /* Point down when open */
}

.faq-answer {
  color: var(--color-cloud);
  padding: 0 var(--card-padding) var(--card-padding) var(--card-padding);
}

/* Footer Styles */
.footer {
  padding: 3em 0 2em 0;
  margin-top: 4em;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2em;
  align-items: start;
}

.footer-section {
  display: flex;
  flex-direction: column;
  gap: 1em;
}

.footer-title {
  color: var(--color-sea);
  font-size: 1.2em;
  font-weight: 500;
  margin: 0;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5em;
}

.footer-link {
  color: var(--color-cloud);
  text-decoration: none;
  opacity: 0.8;
  transition: opacity 0.3s ease;
}

.footer-link:hover {
  opacity: 1;
  color: var(--color-aqua);
}

.footer-disclaimer {
  color: var(--color-cloud);
  opacity: 0.7;
  font-size: 0.9em;
  line-height: 1.5;
  margin: 0;
}

/* Responsive Footer */
@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
    gap: 2em;
    text-align: left;
  }
  
  .footer {
    padding: 2em 0 1.5em 0;
    margin-top: 2em;
  }
}

/* Competitive Table Styles */
.competitive {
  padding: 2em 0;
}

.table-container {
  overflow-x: auto;
  border-radius: var(--border-radius);
  margin-top: 2em;
}

.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--color-ocean);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.comparison-table th {
  background: var(--color-ocean);
  color: var(--color-cloud);
  padding: 1.5em;
  text-align: left;
  font-weight: 500;
  font-size: 1.1em;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.comparison-table td {
  padding: 1.2em 1.5em;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-cloud);
}

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

.comparison-table thead tr:first-child th:first-child {
  border-top-left-radius: var(--border-radius);
}

.comparison-table thead tr:first-child th:last-child {
  border-top-right-radius: var(--border-radius);
}

.comparison-table tbody tr:last-child td:first-child {
  border-bottom-left-radius: var(--border-radius);
}

.comparison-table tbody tr:last-child td:last-child {
  border-bottom-right-radius: var(--border-radius);
}

.comparison-table .highlight {
  color: var(--color-aqua);
  font-weight: 500;
}

.comparison-table .positive {
  color: var(--color-cloud);
  font-weight: 500;
}

.comparison-table .negative {
  color: var(--color-cloud);
  font-weight: 500;
}

/* Responsive Table */
@media (max-width: 768px) {
  .comparison-table th,
  .comparison-table td {
    padding: 1em;
    font-size: 0.9em;
  }
  
  .table-container {
    margin-top: 1em;
  }
}

/* Feature Numbers */
.feature-number {
  font-size: 3em;
  font-weight: 700;
  color: var(--color-sea);
  margin-bottom: 0.5em;
  line-height: 1;
}

@media (max-width: 768px) {
  .feature-number {
    font-size: 2.5em;
  }
}

/* Enhanced Product Cards */
.product-card {
  position: relative;
}

.product-token {
  font-size: 1.5em;
  font-weight: 700;
  color: var(--color-aqua);
  background: rgba(192, 230, 255, 0.1);
  padding: 0.5em 1em;
  border-radius: 0.5em;
  display: flex;
  align-items: center;
  gap: 0.5em;
  margin-bottom: 1em;
  width: fit-content;
}

.product-token-logo {
  width: 1.5em;
  height: 1.5em;
  flex-shrink: 0;
}

.product-title {
  font-size: 1.3em;
  margin-bottom: 0.5em;
}

.product-highlight {
  background: var(--color-sea);
  color: var(--color-cloud);
  padding: 0.5em 1em;
  border-radius: 0.5em;
  font-size: 0.9em;
  font-weight: 500;
  margin-bottom: 1em;
  display: inline-block;
}

@media (max-width: 768px) {
  .product-token {
    font-size: 1.2em;
    padding: 0.4em 0.8em;
  }
  
  .product-token-logo {
    width: 1.2em;
    height: 1.2em;
  }
  
  .product-title {
    font-size: 1.1em;
  }
  
  .product-highlight {
    font-size: 0.85em;
    padding: 0.4em 0.8em;
  }
}