@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-tertiary: #1a1a1a;
  --border: #2a2a2a;

  --text-primary: #e8e8e8;
  --text-secondary: #888888;

  --accent-green: #00ff88;
  --accent-green-alpha: rgba(0, 255, 136, 0.2);

  --accent-yellow: #ffd700;
  --accent-yellow-alpha: rgba(255, 215, 0, 0.2);

  --accent-red: #ff4757;
  --accent-red-alpha: rgba(255, 71, 87, 0.2);

  --accent-blue: #4da6ff;
  --accent-purple: #b44dff;

  --shadow: 0 4px 24px rgba(0, 255, 136, 0.08);
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  background-color: var(--bg-primary);
  overflow-x: hidden;
  width: 100%;
}

body {
  font-family: 'JetBrains Mono', monospace;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  width: 100%;
  max-width: 1920px;
  margin: 0 auto;
  position: relative;
  min-height: 100vh;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: 'Space Grotesk', sans-serif;
  color: var(--text-primary);
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s;
}

ul {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: 'JetBrains Mono', monospace;
}

/* NAVBAR */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 48px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-green);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
}

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

/* BUTTONS */
.btn-primary {
  background-color: var(--accent-green);
  color: var(--bg-primary);
  padding: 8px 16px;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  transition: 0.3s;
}

.btn-primary:hover {
  box-shadow: 0 0 15px var(--accent-green-alpha);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: var(--border-radius-sm);
  transition: 0.3s;
}

.btn-secondary:hover {
  border-color: var(--text-primary);
}

/* FORMS */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.form-group input {
  width: 100%;
  padding: 12px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent-green);
}

/* CARDS */
.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  padding: 24px;
  transition: 0.3s;
}

.card:hover {
  border-color: var(--accent-green-alpha);
  box-shadow: var(--shadow);
}

/* BADGES */
.difficulty-badge {
  padding: 4px 8px;
  border-radius: var(--border-radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid transparent;
}

.difficulty-easy {
  background-color: var(--accent-green-alpha);
  color: var(--accent-green);
  border-color: rgba(0, 255, 136, 0.4);
}

.difficulty-medium {
  background-color: var(--accent-yellow-alpha);
  color: var(--accent-yellow);
  border-color: rgba(255, 215, 0, 0.4);
}

.difficulty-hard {
  background-color: var(--accent-red-alpha);
  color: var(--accent-red);
  border-color: rgba(255, 71, 87, 0.4);
}

/* NOTIFICATION TOAST */
#toast-container {
  position: fixed;
  top: 80px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toast {
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--accent-green);
  padding: 16px 24px;
  border-radius: var(--border-radius-sm);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-primary);
  min-width: 250px;
}

.toast-error {
  border-left-color: var(--accent-red);
}

/* LOADER */
.loader {
  border: 3px solid var(--border);
  border-top: 3px solid var(--accent-green);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

/* HAMBURGER MENU */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  z-index: 1000;
}

.hamburger span {
  width: 30px;
  height: 3px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: 0.3s;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* MOBILE RESPONSIVE TWEAKS */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .navbar {
    padding: 16px 24px;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: var(--bg-secondary);
    flex-direction: column;
    padding-top: 80px;
    border-left: 1px solid var(--border);
    transition: right 0.3s ease;
    z-index: 100;
    align-items: flex-start;
    padding-left: 32px;
  }

  .nav-links.active {
    right: 0;
  }

  #auth-links,
  #user-links {
    flex-direction: column;
    align-items: flex-start !important;
    gap: 16px;
    width: 100%;
  }
}