/*
  Pagebeam — Site Stylesheet
  ==========================
  Covers: landing page (index.html) and changelog page (changelog.html).
  Light palette only. The extension options page uses a separate dark stylesheet.
  No external URLs. All fonts are self-hosted via @font-face below.
  No media-query dark mode toggle.
  Min-width: 320px. Comfortable at 960px+.
*/

/* ─── Font faces ───────────────────────────────────────────────────────────── */

@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('./fonts/space-grotesk-latin-400-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('./fonts/space-grotesk-latin-500-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('./fonts/space-grotesk-latin-600-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('./fonts/inter-latin-400-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('./fonts/inter-latin-500-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('./fonts/jetbrains-mono-latin-400-normal.woff2') format('woff2');
}

/* ─── Design tokens (site subset) ──────────────────────────────────────────── */

:root {
  /* Palette */
  --color-ink:              #0B0F14;
  --color-surface:          #F5F0E8;
  --color-accent:           #06B6D4;
  --color-ink-muted:        #3D4450;
  --color-ink-dim:          #8B929E;
  --color-surface-raised:   #EDE8DF;
  --color-border:           color-mix(in srgb, #0B0F14 12%, transparent);
  --color-border-strong:    color-mix(in srgb, #0B0F14 35%, transparent);

  /* Typography */
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, monospace;

  /* Type scale */
  --text-xs:    0.75rem;
  --text-sm:    0.875rem;
  --text-base:  1rem;
  --text-lg:    1.125rem;
  --text-xl:    1.5rem;
  --text-2xl:   2rem;
  --text-3xl:   3rem;

  /* Leading */
  --leading-tight:   1.1;
  --leading-snug:    1.25;
  --leading-normal:  1.5;
  --leading-relaxed: 1.6;

  /* Tracking */
  --tracking-tightest: -0.03em;
  --tracking-tight:    -0.015em;
  --tracking-snug:     -0.01em;
  --tracking-normal:    0em;
  --tracking-wide:      0.04em;
  --tracking-wider:     0.08em;

  /* Weight */
  --weight-regular:  400;
  --weight-medium:   500;
  --weight-semibold: 600;

  /* Spacing — 4px base */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border radius */
  --radius-none: 0;
  --radius-sm:   2px;
  --radius-base: 4px;

  /* Layout */
  --content-base: 768px;
  --content-lg:   960px;

  /* Motion */
  --duration-fast:  120ms;
  --duration-base:  200ms;
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);

  /* Z-index */
  --z-raised: 10;
}

/* ─── Reset & base ──────────────────────────────────────────────────────────── */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-relaxed);
  letter-spacing: var(--tracking-normal);
  min-width: 320px;
}

/* ─── Nav ───────────────────────────────────────────────────────────────────── */

.site-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-raised);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  height: 56px;
  display: flex;
  align-items: center;
}

.site-nav__inner {
  width: 100%;
  max-width: var(--content-lg);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-ink);
}

.site-nav__logo {
  display: block;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.site-nav__wordmark {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-snug);
  line-height: var(--leading-snug);
  color: var(--color-ink);
}

/* Primary CTA button — ink fill */
.btn-primary {
  display: inline-block;
  background-color: var(--color-ink);
  color: var(--color-surface);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-normal);
  text-decoration: none;
  padding: 10px 20px;
  border-radius: var(--radius-base);
  border: none;
  cursor: pointer;
  transition:
    outline-color var(--duration-fast) var(--ease-standard);
  outline: 2px solid transparent;
  outline-offset: 2px;
  white-space: nowrap;
}

.btn-primary:hover {
  outline-color: var(--color-accent);
}

.btn-primary:focus-visible {
  outline-color: var(--color-accent);
}

/* Large CTA variant used in hero */
.btn-primary--lg {
  font-size: var(--text-base);
  padding: 14px 28px;
}

/* ─── Page wrapper ──────────────────────────────────────────────────────────── */

.site-content {
  width: 100%;
  max-width: var(--content-lg);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ─── Hero section ──────────────────────────────────────────────────────────── */

.hero {
  padding-top: var(--space-20);
  padding-bottom: var(--space-24);
}

.hero__headline {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-tightest);
  line-height: var(--leading-tight);
  color: var(--color-ink);
  max-width: var(--content-base);
}

/* Beam motif: 1px ink rule directly under headline. Echoes the logo beam ray. */
.hero__rule {
  display: block;
  width: 100%;
  max-width: var(--content-base);
  height: 1px;
  background: var(--color-ink);
  border: none;
  margin-top: var(--space-4);
  margin-bottom: var(--space-6);
}

.hero__subhead {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: var(--weight-regular);
  line-height: var(--leading-relaxed);
  letter-spacing: var(--tracking-normal);
  color: var(--color-ink-muted);
  max-width: var(--content-base);
  margin-bottom: var(--space-8);
}

.hero__cta {
  display: flex;
}

/* ─── Features section ──────────────────────────────────────────────────────── */

.features {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-16);
  padding-bottom: var(--space-24);
}

.features__list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  max-width: var(--content-base);
}

@media (min-width: 640px) {
  .features__list {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
  }
}

.feature__label {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-normal);
  color: var(--color-ink);
  margin-bottom: var(--space-2);
}

.feature__desc {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-relaxed);
  letter-spacing: var(--tracking-normal);
  color: var(--color-ink-muted);
}

/* ─── Footer ────────────────────────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) var(--space-6);
}

.site-footer__inner {
  width: 100%;
  max-width: var(--content-lg);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.site-footer__copy,
.site-footer__link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-normal);
  color: var(--color-ink-muted);
}

.site-footer__sep {
  color: var(--color-ink-dim);
  user-select: none;
}

.site-footer__link {
  text-decoration: none;
}

.site-footer__link:hover {
  color: var(--color-ink);
  text-decoration: underline;
}

.site-footer__link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ─── Changelog page ────────────────────────────────────────────────────────── */

.changelog {
  padding-top: var(--space-16);
  padding-bottom: var(--space-24);
}

.changelog__heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: var(--color-ink);
  margin-bottom: var(--space-4);
}

.changelog__rule {
  display: block;
  width: 120px;
  height: 1px;
  background: var(--color-ink);
  border: none;
  margin-bottom: var(--space-12);
}

.changelog__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-10);
  max-width: var(--content-base);
}

/* Each version block: left border at 15% ink opacity */
.changelog-entry {
  border-left: 2px solid color-mix(in srgb, #0B0F14 15%, transparent);
  padding-left: var(--space-6);
}

.changelog-entry__meta {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.changelog-entry__version {
  font-family: var(--font-mono);
  font-size: 0.8125rem; /* 13px */
  font-weight: var(--weight-regular);
  letter-spacing: var(--tracking-wide);
  line-height: var(--leading-normal);
  color: var(--color-accent);
}

.changelog-entry__sep {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-dim);
  user-select: none;
}

.changelog-entry__date {
  font-family: var(--font-mono);
  font-size: var(--text-xs); /* 12px */
  font-weight: var(--weight-regular);
  letter-spacing: var(--tracking-wider);
  line-height: var(--leading-normal);
  color: var(--color-ink-dim);
}

.changelog-entry__items {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.changelog-entry__item {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-relaxed);
  letter-spacing: var(--tracking-normal);
  color: var(--color-ink);
}

/* ─── Accessibility utilities ───────────────────────────────────────────────── */

/* Visually hidden but available to screen readers */
.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;
}

/* ─── Responsive adjustments ────────────────────────────────────────────────── */

@media (max-width: 480px) {
  .hero__headline {
    font-size: 2rem; /* 32px — still large, readable at 320px */
  }

  .hero__subhead {
    font-size: var(--text-base);
  }

  .site-nav__inner {
    padding: 0 var(--space-4);
  }

  .site-content {
    padding: 0 var(--space-4);
  }

  .site-footer {
    padding: var(--space-8) var(--space-4);
  }
}