/* ========================================
   1. CSS Custom Properties
   ======================================== */

:root {
  /* Primary */
  --color-primary: #6C63FF;
  --color-primary-light: #8B85FF;
  --color-primary-dark: #4F46E5;

  /* Neutrals (Slate scale) */
  --color-gray-950: #0B0F1A;
  --color-gray-800: #1E293B;
  --color-gray-600: #475569;
  --color-gray-400: #94A3B8;
  --color-gray-200: #E2E8F0;
  --color-gray-100: #F1F5F9;
  --color-gray-50: #F8FAFC;
  --color-white: #FFFFFF;

  /* Code blocks */
  --color-code-bg: #1E293B;
  --color-code-text: #E2E8F0;

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #F8FAFC 0%, #EEF2FF 50%, #F8FAFC 100%);

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  --leading-tight: 1.25;
  --leading-normal: 1.6;

  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Spacing */
  --section-padding: 6rem;
  --container-max: 1120px;

  /* Misc */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.1);
  --transition: 0.2s ease;
}

/* ========================================
   2. CSS Reset / Base
   ======================================== */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--color-gray-800);
  background-color: var(--color-gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  color: var(--color-gray-950);
  line-height: var(--leading-tight);
  font-weight: var(--font-bold);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p {
  color: var(--color-gray-600);
  max-width: 640px;
}

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

a:hover {
  color: var(--color-primary-dark);
}

ul {
  list-style: none;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

img, svg {
  display: block;
  max-width: 100%;
}

/* ========================================
   3. Utility Classes
   ======================================== */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 2rem;
}

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

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

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-header h2 {
  margin-bottom: 1rem;
}

.section-header p {
  margin: 0 auto;
  font-size: var(--text-lg);
}

/* ========================================
   4. Components
   ======================================== */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
}

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

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--color-gray-800);
  border-color: var(--color-gray-200);
}

.btn-secondary:hover {
  border-color: var(--color-gray-400);
  color: var(--color-gray-950);
  transform: translateY(-1px);
}

/* Cards */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-gray-300, #CBD5E1);
}

/* Badge */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-primary {
  background: #EEF2FF;
  color: var(--color-primary-dark);
}

.badge-green {
  background: #ECFDF5;
  color: #059669;
}

.badge-amber {
  background: #FFFBEB;
  color: #B45309;
}

/* Code Block */
.code-block {
  background: var(--color-code-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}

.code-block-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.2);
}

.code-block-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.code-block-dot:nth-child(1) { background: #FF5F57; }
.code-block-dot:nth-child(2) { background: #FFBD2E; }
.code-block-dot:nth-child(3) { background: #28C840; }

.code-block pre {
  padding: 1.25rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.code-block code {
  color: var(--color-code-text);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.code-block .copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-gray-400);
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.6rem;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: all var(--transition);
}

.code-block .copy-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
}

/* Feature icon */
.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #EEF2FF;
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
  color: var(--color-primary);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

/* Step number */
.step-number {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  flex-shrink: 0;
}

/* ========================================
   5. Layout Sections
   ======================================== */

/* --- Nav --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 1rem 0;
  background: rgba(248, 250, 252, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: box-shadow var(--transition);
}

.nav.scrolled {
  box-shadow: var(--shadow-sm);
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-gray-950);
}

.nav-brand svg {
  width: 36px;
  height: 36px;
}

.nav-brand span {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  letter-spacing: -0.02em;
}

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

.nav-links a {
  color: var(--color-gray-600);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  text-decoration: none;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--color-gray-950);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-gray-800);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* --- Hero --- */
.hero {
  background: var(--gradient-hero);
  padding: 5rem 0 6rem;
}

.hero .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero h1 {
  max-width: 720px;
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: var(--text-lg);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
}

.hero-terminal {
  max-width: 560px;
  width: 100%;
  text-align: left;
}

.hero-terminal .prompt { color: #10B981; }
.hero-terminal .command { color: #E2E8F0; }
.hero-terminal .output { color: #94A3B8; }
.hero-terminal .highlight { color: #6C63FF; }

.hero-tools {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.hero-tools span {
  font-size: var(--text-sm);
  color: var(--color-gray-400);
  font-weight: var(--font-medium);
}

.tool-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-gray-800);
  font-weight: var(--font-medium);
}

/* --- TLDR (Parallax) --- */
.tldr {
  position: relative;
  padding: 6rem 0;
  overflow: hidden;
  color: var(--color-white);
}

.tldr-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 60%, rgba(108, 99, 255, 0.15) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 80% 40%, rgba(79, 70, 229, 0.12) 0%, transparent 70%),
    linear-gradient(135deg, #0B0F1A 0%, #1a1040 40%, #1E293B 100%);
  background-attachment: fixed;
  background-size: cover;
}

/* Watermark logo */
.tldr-logo {
  position: absolute;
  width: 500px;
  height: 500px;
  right: -60px;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(108, 99, 255, 0.06);
}

/* Subtle dot grid overlay */
.tldr-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
  background-attachment: fixed;
}

/* Top/bottom gradient fade for smooth blending */
.tldr-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, rgba(11, 15, 26, 0.6) 0%, transparent 15%, transparent 85%, rgba(11, 15, 26, 0.6) 100%);
}

.tldr-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.tldr-content h2 {
  font-size: var(--text-2xl);
  margin-bottom: 1.5rem;
  color: var(--color-primary-light);
}

.tldr-content p {
  max-width: 720px;
  margin: 0 auto 1.25rem;
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-gray-200);
}

.tldr-content p:last-child {
  margin-bottom: 0;
}

/* --- Features --- */
.features {
  padding: var(--section-padding) 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card h3 {
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

/* --- How It Works --- */
.how-it-works {
  padding: var(--section-padding) 0;
  background: var(--color-gray-100);
}

.steps {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.step {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.step-line {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.step-connector {
  width: 2px;
  flex: 1;
  background: var(--color-gray-200);
  min-height: 2rem;
}

.step-content {
  flex: 1;
  padding-bottom: 0.5rem;
}

.step-content h3 {
  margin-bottom: 0.5rem;
}

.step-content p {
  font-size: var(--text-sm);
  margin-bottom: 1rem;
}

.step-content .code-block {
  margin-top: 0.75rem;
}

/* --- Tool Setup --- */
.tool-setup {
  padding: var(--section-padding) 0;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  max-width: 960px;
  margin: 0 auto;
}

.tool-card {
  display: flex;
  flex-direction: column;
}

.tool-card .badge {
  align-self: flex-start;
  margin-bottom: 1rem;
}

.tool-card h3 {
  margin-bottom: 0.75rem;
}

.tool-card p {
  font-size: var(--text-sm);
  margin-bottom: 1rem;
}

.tool-card .code-block {
  margin-bottom: 1rem;
}

.tool-card .card-link {
  margin-top: auto;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
}

/* --- Getting Started --- */
.getting-started {
  padding: var(--section-padding) 0;
  background: var(--color-gray-100);
}

.start-steps {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.start-step h3 {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.start-step p {
  font-size: var(--text-sm);
  margin-bottom: 1rem;
}

.start-cta {
  text-align: center;
  margin-top: 3rem;
}

/* --- Footer --- */
.footer {
  padding: 3rem 0;
  border-top: 1px solid var(--color-gray-200);
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-gray-600);
  font-size: var(--text-sm);
}

.footer-brand svg {
  width: 24px;
  height: 24px;
  color: var(--color-gray-400);
}

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

.footer-links a {
  color: var(--color-gray-600);
  font-size: var(--text-sm);
}

.footer-links a:hover {
  color: var(--color-gray-950);
}

.footer-tagline {
  font-size: var(--text-sm);
  color: var(--color-gray-400);
}

/* ========================================
   6. Responsive
   ======================================== */

@media (max-width: 768px) {
  :root {
    --section-padding: 4rem;
  }

  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-2xl); }

  /* Nav */
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-white);
    padding: 1.5rem 2rem;
    box-shadow: var(--shadow-md);
    gap: 1rem;
  }

  .nav-links.open {
    display: flex;
  }

  /* Hero */
  .hero {
    padding: 3rem 0 4rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
  }

  .hero-actions .btn {
    justify-content: center;
  }

  .hero-tools {
    flex-wrap: wrap;
    justify-content: center;
  }

  /* Grids */
  .features-grid,
  .tool-grid {
    grid-template-columns: 1fr;
  }

  /* Steps */
  .step {
    gap: 1rem;
  }

  /* Footer */
  .footer .container {
    flex-direction: column;
    gap: 1.5rem;
    text-align: center;
  }

  .footer-links {
    gap: 1.5rem;
  }
}

@media (max-width: 480px) {
  h1 { font-size: var(--text-3xl); }

  .container {
    padding: 0 1.25rem;
  }

  .hero-terminal {
    max-width: 100%;
  }

  .code-block pre {
    padding: 1rem;
  }

  .code-block code {
    font-size: var(--text-xs);
  }
}