/* Tezos Official Colors */
:root {
  --tezos-blue: #0F61FF;
  --tezos-blue-hover: #0b4bcc;
  --stealth: #1D2227; /* Dark background */
  --slate: #616F82;
  --steel: #838893;
  --white: #FFFFFF;
  --light-gray: #f5f5f5;
  
  /* Theme Variables - Default Dark */
  --bg-primary: var(--stealth);
  --bg-secondary: #2c323a;
  --text-primary: var(--white);
  --text-secondary: var(--steel);
  --card-bg: #252b33;
  --border-color: #363c45;
  --accent: var(--tezos-blue);
  
  --font-main: 'Roboto', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --container-width: 1200px;
  --header-height: 70px;
}

[data-theme="light"] {
  --bg-primary: var(--white);
  --bg-secondary: var(--light-gray);
  --text-primary: var(--stealth);
  --text-secondary: var(--slate);
  --card-bg: #ffffff;
  --border-color: #e0e0e0;
  --accent: var(--tezos-blue);
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; color: var(--text-primary); }
h3 { font-size: 1.5rem; }

p { margin-bottom: 1rem; color: var(--text-secondary); }

/* Layout Utilities */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4rem 0;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
  border: none;
}

.btn-primary {
  background-color: var(--tezos-blue);
  color: white;
}

.btn-primary:hover {
  background-color: var(--tezos-blue-hover);
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  border-color: var(--tezos-blue);
  color: var(--tezos-blue);
}

/* Header */
header {
  position: fixed;
  top: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(29, 34, 39, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
}

[data-theme="light"] header {
  background-color: rgba(255, 255, 255, 0.95);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  font-weight: 700;
  font-size: 1.2rem;
  gap: 10px;
}

.logo img {
  height: 30px;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--tezos-blue);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Mobile Menu */
.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding-top: calc(var(--header-height) + 4rem);
  padding-bottom: 4rem;
  text-align: center;
  background: radial-gradient(circle at top right, rgba(15, 97, 255, 0.1), transparent 40%);
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--steel) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  max-width: 700px;
  margin: 0 auto 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* Cards Grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.card {
  background-color: var(--card-bg);
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
  border-color: var(--tezos-blue);
}

.card h3 {
  margin-bottom: 1rem;
  color: var(--tezos-blue);
}

/* Footer */
footer {
  background-color: var(--bg-secondary);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.footer-col ul li {
  margin-bottom: 0.75rem;
}

.footer-col ul li a:hover {
  color: var(--tezos-blue);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.8rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--tezos-blue);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 2.5rem; }
  
  .hamburger { display: block; }
  
  .nav-links {
    position: fixed;
    top: var(--header-height);
    right: 0;
    height: calc(100vh - var(--header-height));
    background-color: var(--bg-primary);
    flex-direction: column;
    width: 250px;
    padding: 2rem;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    border-left: 1px solid var(--border-color);
  }
  
  .nav-links.active {
    transform: translateX(0);
  }
}