/* ========================================
   V3 CORE: Variables, Reset, Base, Nav, Footer
   PersonaSpec - Dark/Terminal Aesthetic
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700;800&family=Inter:wght@400;500;600;700&display=swap');

/* ----------------------------------------
   CSS Custom Properties
   ---------------------------------------- */
:root {
  /* Colors */
  --bg: #0A0A0A;
  --bg-raised: #111111;
  --bg-amber: #F59E0B;
  --text: #FAFAFA;
  --text-muted: #737373;
  --text-dark: #0A0A0A;
  --amber: #F59E0B;
  --amber-hover: #D97706;
  --border: #262626;

  /* Feedback colors */
  --success: #22C55E;
  --warning: #F59E0B;
  --error: #EF4444;
  --note: #737373;

  /* Syntax highlighting */
  --syntax-comment: #525252;
  --syntax-keyword: #F472B6;
  --syntax-string: #4ADE80;
  --syntax-function: #60A5FA;

  /* Layout */
  --max-width: 1400px;
  --content-padding: 40px;

  /* Typography scale */
  --text-xs: 0.625rem;   /* 10px */
  --text-sm: 0.75rem;    /* 12px */
  --text-base: 0.8125rem; /* 13px */
  --text-md: 0.875rem;   /* 14px */
  --text-lg: 0.9375rem;  /* 15px */
  --text-xl: 1rem;       /* 16px */
  --text-2xl: 1.25rem;   /* 20px */
  --text-3xl: 1.5rem;    /* 24px */
  --text-4xl: 1.75rem;   /* 28px */
  --text-5xl: 2.5rem;    /* 40px */
  --text-6xl: 3.5rem;    /* 56px */
}

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

html {
  scroll-behavior: smooth;
}

/* ----------------------------------------
   Base Typography
   ---------------------------------------- */
body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Monospace for headlines */
h1, h2, h3, .mono {
  font-family: 'JetBrains Mono', monospace;
}

h1 {
  font-size: var(--text-6xl);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
}

h2 {
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: -0.02em;
}

h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: -0.01em;
}

h4 {
  font-size: var(--text-md);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--amber);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9em;
  background: var(--bg-raised);
  padding: 0.2em 0.4em;
  border-radius: 3px;
}

strong {
  font-weight: 600;
}

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.5rem;
}

/* ----------------------------------------
   Navigation
   ---------------------------------------- */
.nav {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 100;
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
  display: flex;
  align-items: center;
  gap: 48px;
}

.nav__logo {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: var(--text-xl);
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav__logo:hover {
  color: var(--text);
}

.nav__links {
  display: flex;
  gap: 32px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav__links li {
  margin: 0;
}

.nav__links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: var(--text-base);
  transition: color 0.15s ease;
}

.nav__links a:hover,
.nav__links a.is-active {
  color: var(--text);
}

.nav__cta {
  margin-left: auto;
}

/* Mobile nav toggle (hidden by default) */
.nav__toggle {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
  margin-left: auto;
}

.nav__toggle-icon {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  position: relative;
}

.nav__toggle-icon::before,
.nav__toggle-icon::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background: var(--text);
  left: 0;
}

.nav__toggle-icon::before {
  top: -8px;
}

.nav__toggle-icon::after {
  top: 8px;
}

/* ----------------------------------------
   Footer
   ---------------------------------------- */
.footer {
  padding: 32px var(--content-padding);
  border-top: 1px solid var(--border);
  font-size: var(--text-sm);
  color: var(--text-muted);
  text-align: center;
  font-family: 'JetBrains Mono', monospace;
}

/* ----------------------------------------
   Utility Classes
   ---------------------------------------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 100px var(--content-padding);
}

.section--border {
  border-bottom: 1px solid var(--border);
}

.section__header {
  margin-bottom: 48px;
}

.section__title {
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

.section__intro {
  color: var(--text-muted);
  font-size: var(--text-lg);
  max-width: 480px;
}

/* ----------------------------------------
   Buttons
   ---------------------------------------- */
.btn {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-base);
  font-weight: 600;
  padding: 14px 28px;
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}

.btn--primary {
  background: var(--amber);
  color: var(--text-dark);
}

.btn--primary:hover {
  background: var(--amber-hover);
  color: var(--text-dark);
}

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

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

/* ----------------------------------------
   Responsive
   ---------------------------------------- */
@media (max-width: 1000px) {
  :root {
    --content-padding: 24px;
  }

  .nav__toggle {
    display: block;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
  }

  .nav__links.is-open {
    display: flex;
  }

  .nav__cta {
    display: none;
  }

  .section {
    padding: 60px var(--content-padding);
  }

  h1 {
    font-size: clamp(2rem, 8vw, 3.5rem);
  }
}

@media (max-width: 600px) {
  :root {
    --content-padding: 16px;
  }
}