/* ==========================================================================
   Mountain Path Treks - Base Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Colors */
  --primary-bg: #0f0f23;
  --secondary-bg: #1a1a2e;
  --text-light: #f8f9fa;
  --text-muted: #a0a0a0;
  --accent: #e94560;
  --accent-hover: #ff6b6b;
  --border: #2d2d44;

  /* Spacing */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;
  --space-3xl: 96px;

  /* Layout */
  --max-width: 1200px;
  --container-padding: 20px;

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.6;
  --line-height-heading: 1.2;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Borders */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 16px;
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: var(--line-height-base);
  color: var(--text-light);
  background-color: var(--primary-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

a {
  text-decoration: none;
  color: inherit;
  background: none;
}

ul,
ol {
  list-style: none;
}

/* --------------------------------------------------------------------------
   Base Typography
   -------------------------------------------------------------------------- */
h1 {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: var(--line-height-heading);
}

h2 {
  font-size: 2rem;
  font-weight: 600;
  line-height: var(--line-height-heading);
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: var(--line-height-heading);
}

h4 {
  font-size: 1.25rem;
  font-weight: 500;
  line-height: var(--line-height-heading);
}

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

p:last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Links
   -------------------------------------------------------------------------- */
a {
  color: var(--text-light);
  transition: color var(--transition-fast);
}

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

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

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

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

.text-muted {
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  border: none;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-primary {
  background-color: var(--accent);
  color: var(--text-light);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  color: var(--text-light);
}

.btn-primary:active {
  transform: scale(0.98);
}

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

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

/* --------------------------------------------------------------------------
   Header / Navigation
   -------------------------------------------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--primary-bg);
  border-bottom: 1px solid var(--border);
  padding: var(--space-sm) 0;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-light);
}

.logo:hover {
  color: var(--accent);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-menu a {
  font-weight: 500;
  padding: var(--space-xs) 0;
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent);
  transition: width var(--transition-fast);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-light);
  transition: transform var(--transition-fast);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 80px;
  background: linear-gradient(135deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
}

.hero-content {
  max-width: 800px;
  padding: var(--space-xl);
}

.hero h1 {
  margin-bottom: var(--space-md);
  color: var(--text-light);
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  background-color: var(--secondary-bg);
  border-top: 1px solid var(--border);
  padding: var(--space-xl) 0;
  text-align: center;
}

.footer p {
  color: var(--text-muted);
  font-size: 0.875rem;
}

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

/* --------------------------------------------------------------------------
   About Preview Section
   -------------------------------------------------------------------------- */
.about-preview {
  padding: var(--space-2xl) 0;
  background-color: var(--primary-bg);
}

.about-preview .container {
  max-width: 900px;
}

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

.about-content h2 {
  margin-bottom: var(--space-md);
}

.about-content p {
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

/* --------------------------------------------------------------------------
   Destinations Section
   -------------------------------------------------------------------------- */
.destinations {
  padding: var(--space-2xl) 0;
  background-color: var(--secondary-bg);
}

.destination-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.destination-card {
  background-color: var(--primary-bg);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.destination-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
}

.destination-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
}

.destination-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.destination-card:hover .destination-image img {
  transform: scale(1.05);
}

.destination-content {
  padding: var(--space-md);
}

.destination-content h3 {
  margin-bottom: var(--space-sm);
}

.destination-content p {
  color: var(--text-muted);
  margin-bottom: var(--space-md);
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   Treks Section
   -------------------------------------------------------------------------- */
.treks {
  padding: var(--space-2xl) 0;
  background-color: var(--primary-bg);
}

.treks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.trek-card {
  background-color: var(--secondary-bg);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.trek-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
}

.trek-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
}

.trek-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.trek-card:hover .trek-image img {
  transform: scale(1.05);
}

.trek-content {
  padding: var(--space-md);
}

.trek-content h4 {
  margin-bottom: var(--space-sm);
}

.trek-content p {
  color: var(--text-muted);
  margin-bottom: var(--space-md);
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   Content Section
   -------------------------------------------------------------------------- */
.content-section {
  padding: var(--space-2xl) 0;
}

.placeholder-content {
  text-align: center;
  padding: var(--space-2xl);
  background-color: var(--secondary-bg);
  border-radius: var(--border-radius-lg);
}

.placeholder-message h3 {
  margin-bottom: var(--space-md);
}

.placeholder-message p {
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.placeholder-message ul {
  text-align: left;
  max-width: 400px;
  margin: var(--space-md) auto;
  color: var(--text-muted);
}

.placeholder-message ul li {
  margin-bottom: var(--space-xs);
}

/* --------------------------------------------------------------------------
   Responsive Styles
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --container-padding: 16px;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  .hero {
    min-height: auto;
    padding: 120px 0 var(--space-xl);
  }

  .hero-content {
    padding: var(--space-md);
  }

  .hero p {
    font-size: 1rem;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    flex-direction: column;
    justify-content: flex-start;
    padding-top: 80px;
    background-color: var(--secondary-bg);
    border-left: 1px solid var(--border);
    transition: right var(--transition-base);
    gap: var(--space-md);
  }

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

  .mobile-menu-toggle {
    display: flex;
    z-index: 1001;
  }

  .mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
}

@media (min-width: 769px) {
  .nav-menu {
    display: flex !important;
  }
}