/* ============================================
   Font Faces
   ============================================ */

@font-face {
  font-family: "crewmate";
  src:
    url("/crewmate-regular.woff2") format("woff2"),
    url("/crewmate-regular.otf") format("opentype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

/* ============================================
   CSS Variables
   ============================================ */

:root {
  /* Colors - Primary */
  --color-primary: #000000;
  --color-primary-light: #333333;
  --color-primary-dark: #000000;
  
  /* Colors - Secondary */
  --color-secondary: #666666;
  --color-secondary-light: #999999;
  --color-secondary-dark: #333333;
  
  /* Colors - Accent */
  --color-accent: #0066cc;
  --color-accent-light: #3399ff;
  --color-accent-dark: #004499;
  
  /* Colors - Neutral */
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  
  /* Colors - Semantic */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  
  /* Colors - Background */
  --color-bg-primary: var(--color-white);
  --color-bg-secondary: var(--color-gray-50);
  --color-bg-tertiary: var(--color-gray-100);
  
  /* Colors - Text */
  --color-text-primary: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-tertiary: var(--color-gray-400);
  --color-text-inverse: var(--color-white);
  --color-button-primary: #0302F5;
  
  /* Typography - Font Family */
  --font-family-primary: 'Inter Tight', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-family-mono: 'Courier New', Courier, monospace;
  
  /* Typography - Font Sizes */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1.125rem; /* 18px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  --font-size-6xl: 3.75rem;   /* 60px */
  --font-size-7xl: 4.5rem;    /* 72px */
  
  /* Typography - Font Weights */
  --font-weight-thin: 100;
  --font-weight-extralight: 200;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --font-weight-black: 900;
  
  /* Typography - Line Heights */
  --line-height-none: 1;
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Typography - Letter Spacing */
  --letter-spacing-tighter: -0.05em;
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  --letter-spacing-widest: 0.1em;
  
  /* Spacing - Base Unit */
  --spacing-unit: 0.25rem; /* 4px */
  
  /* Spacing - Scale */
  --spacing-0: 0;
  --spacing-1: calc(var(--spacing-unit) * 1);   /* 4px */
  --spacing-2: calc(var(--spacing-unit) * 2);   /* 8px */
  --spacing-3: calc(var(--spacing-unit) * 3);   /* 12px */
  --spacing-4: calc(var(--spacing-unit) * 4);   /* 16px */
  --spacing-5: calc(var(--spacing-unit) * 5);   /* 20px */
  --spacing-6: calc(var(--spacing-unit) * 6);   /* 24px */
  --spacing-8: calc(var(--spacing-unit) * 8);   /* 32px */
  --spacing-10: calc(var(--spacing-unit) * 10); /* 40px */
  --spacing-12: calc(var(--spacing-unit) * 12); /* 48px */
  --spacing-16: calc(var(--spacing-unit) * 16); /* 64px */
  --spacing-20: calc(var(--spacing-unit) * 20); /* 80px */
  --spacing-24: calc(var(--spacing-unit) * 24); /* 96px */
  --spacing-32: calc(var(--spacing-unit) * 32); /* 128px */
  --spacing-40: calc(var(--spacing-unit) * 40); /* 160px */
  --spacing-48: calc(var(--spacing-unit) * 48); /* 192px */
  --spacing-64: calc(var(--spacing-unit) * 64); /* 256px */
}

/* ============================================
   Base Styles
   ============================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 160px;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  padding: var(--spacing-16) 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-base);
  margin: var(--spacing-12) 0 var(--spacing-4) 0;
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-base);
}

p {
  margin-bottom: var(--spacing-4);
}

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

a:hover {
  text-decoration: underline;
}

pre {
  margin-left: 0;
}

/* ============================================
   Components
   ============================================ */

/* Navigation */
navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: fixed;
  top: 25px;
  left: 0;
  right: 0;
  z-index: 100;
  max-width: 670px;
  margin: 0 auto var(--spacing-12) auto;
  padding: 12px 24px;
  background-color: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  -moz-backdrop-filter: blur(10px);
}

.logo {
  color: #21201C;
  font-family: 'crewmate', var(--font-family-primary), sans-serif;
  font-size: 24px;
  font-weight: var(--font-weight-medium);
  line-height: 1.2;
  margin: 0;
  padding: 0;
  text-decoration: none;
}

.sublogo {
  color: #63635E;
  font-family: var(--font-family-primary);
  font-size: 16px;
  font-weight: var(--font-weight-normal);
  line-height: 1.2;
  margin: 0;
  padding: 0;
  text-decoration: none;
}

.navigation-links {
  display: flex;
  gap: var(--spacing-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.navigation-links li {
  margin: 0;
  padding: 0;
}

/* Code Block */
.code {
  font-size: var(--font-size-sm);
  white-space-collapse: preserve-breaks;
  background-color: rgb(36, 36, 36);
  color: rgb(250, 250, 250);
  border-radius: 16px;
  padding: 24px;
  margin: var(--spacing-8) 0 var(--spacing-10) 0;
}

/* Video Container */
.video-container {
  width: 100%;
  height: auto;
  border-radius: 16px;
  overflow: hidden;
  margin: var(--spacing-20) 0;
}

video {
  width: 100%;
  height: auto;
  border-radius: 16px;
  transform: scale(1.1);
}

/* ============================================
   Utility Classes
   ============================================ */

.container {
  max-width: 670px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

.container-wide {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--spacing-12) var(--spacing-4);
}

.container-wide:first-of-type {
  margin-top: 0;
  padding-top: var(--spacing-16);
  padding-bottom: 0;
}

footer.container {
  margin-top: var(--spacing-24);
}

/* Button */
button {
  background-color: var(--color-button-primary);
  color: #ffffff;
  border: none;
  border-radius: 16px;
  padding: 12px 24px;
  cursor: pointer;
  font-size: var(--font-size-sm);
  /* font-weight: var(--font-weight-medium); */
  line-height: 1.2;
  margin: 0 0 var(--spacing-6) 0;
  /* padding: 0; */
  text-decoration: none;
  transition: background-color 0.3s ease;
  border: 1px solid var(--color-button-primary);
}

button:hover {
  background-color: var(--color-button-primary-hover);
  color: var(--color-button-primary);
}