/* Her Hormone Insider — Marlowe Bennett letters
   Source of truth for visual system. Edit here. */

/* ============================================================
   §6.1 — Design tokens
   ============================================================ */
:root {
  --color-bg: #FAF7F2;
  --color-text: #1F1B16;
  --color-text-soft: #5C544A;
  --color-accent: #8E0E2E;
  --color-accent-hover: #6B0A22;
  --color-border: #E5DED2;
  --color-card-bg: #F2EBDD;
  --color-overlay: rgba(31, 27, 22, 0.5);

  --font-serif: "Source Serif 4", Charter, "Iowan Old Style", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;

  --fs-body: 1.1875rem;
  --fs-body-mobile: 1.0625rem;
  --fs-h1: 2.5rem;
  --fs-h1-mobile: 2rem;
  --fs-h2: 1.625rem;
  --fs-h2-mobile: 1.4375rem;
  --fs-h3: 1.5rem;
  --fs-meta: 0.875rem;
  --fs-small: 0.9375rem;
  --fs-fine-print: 0.8125rem;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-xxl: 6rem;

  --content-width: 680px;
  --content-width-narrow: 560px;
  --header-width: 1200px;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;

  --lh-body: 1.75;
  --lh-heading: 1.25;
  --lh-tight: 1.1;
}

/* ============================================================
   §6.10 — @font-face (self-hosted Source Serif 4 variable)
   Two files cover the 400-700 weight axis (normal + italic).
   ============================================================ */
@font-face {
  font-family: "Source Serif 4";
  src: url("/fonts/source-serif-4-regular.woff2") format("woff2-variations"),
       url("/fonts/source-serif-4-regular.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Source Serif 4";
  src: url("/fonts/source-serif-4-italic.woff2") format("woff2-variations"),
       url("/fonts/source-serif-4-italic.woff2") format("woff2");
  font-weight: 400 700;
  font-style: italic;
  font-display: swap;
}

/* ============================================================
   §6.2 — Reset & base typography
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-serif);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  margin: 0;
  padding: 0;
}

@media (max-width: 720px) {
  body { font-size: var(--fs-body-mobile); }
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.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;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-accent);
  color: #FFFFFF;
  padding: var(--space-sm) var(--space-md);
  z-index: 999;
  text-decoration: none;
}
.skip-link:focus { left: 0; }

h1 {
  font-family: var(--font-serif);
  font-size: var(--fs-h1);
  line-height: var(--lh-heading);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-lg);
  color: var(--color-text);
}
@media (max-width: 720px) {
  h1 { font-size: var(--fs-h1-mobile); }
}

h2 {
  font-family: var(--font-serif);
  font-size: var(--fs-h2);
  line-height: var(--lh-heading);
  font-weight: 600;
  margin: var(--space-xl) 0 var(--space-md);
  color: var(--color-text);
}
@media (max-width: 720px) {
  h2 { font-size: var(--fs-h2-mobile); }
}

h3 {
  font-family: var(--font-serif);
  font-size: var(--fs-h3);
  line-height: var(--lh-heading);
  font-weight: 600;
  margin: 0 0 var(--space-sm);
}

p { margin: 0 0 var(--space-md); }

strong { font-weight: 600; }
em { font-style: italic; }

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--duration-fast) var(--ease);
}
a:hover, a:focus {
  color: var(--color-accent-hover);
  text-decoration-thickness: 2px;
}
a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: 2px;
}

.letter-content ul {
  padding-left: 1.5em;
  margin: 0 0 var(--space-md);
  list-style: disc;
}
.letter-content ul li {
  margin-bottom: var(--space-sm);
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-xl) auto;
  max-width: 4rem;
}

/* ============================================================
   §6.3 — Site header & breadcrumb
   ============================================================ */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
  transition: transform var(--duration-normal) var(--ease);
}
.site-header.hidden { transform: translateY(-100%); }

.site-header-inner {
  max-width: var(--header-width);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.brand {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.brand:hover, .brand:focus {
  color: var(--color-text);
  text-decoration: none;
}

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

.primary-nav a {
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.primary-nav a:hover, .primary-nav a:focus {
  color: var(--color-accent);
  text-decoration: underline;
}
.primary-nav a.nav-cta {
  color: var(--color-accent);
  font-weight: 500;
}
.primary-nav a.nav-cta:hover, .primary-nav a.nav-cta:focus {
  color: var(--color-accent-hover);
}

.mobile-nav-toggle {
  display: none;
  background: transparent;
  border: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;
  padding: 10px;
}
.mobile-nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
}

@media (max-width: 720px) {
  .primary-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md);
  }
  .primary-nav.is-open { display: block; }
  .primary-nav ul {
    flex-direction: column;
    gap: var(--space-md);
    align-items: flex-start;
  }
  .mobile-nav-toggle { display: flex; }
}

.breadcrumb {
  max-width: var(--content-width);
  margin: var(--space-lg) auto var(--space-md);
  padding: 0 var(--space-md);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  color: var(--color-text-soft);
  letter-spacing: 0.02em;
}
.breadcrumb li:not(:last-child)::after {
  content: " /";
  margin-left: var(--space-xs);
  color: var(--color-text-soft);
}
.breadcrumb a {
  color: var(--color-text-soft);
  text-decoration: none;
}
.breadcrumb a:hover, .breadcrumb a:focus {
  color: var(--color-accent);
  text-decoration: underline;
}
.breadcrumb [aria-current="page"] { color: var(--color-text); }

/* ============================================================
   §6.4 — Letter body
   ============================================================ */
.letter {
  padding: var(--space-lg) var(--space-md) var(--space-xxl);
}

.letter-body {
  max-width: var(--content-width);
  margin: 0 auto;
}

.letter-header {
  margin-bottom: var(--space-xl);
}

.letter-meta {
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  color: var(--color-text-soft);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  align-items: center;
}

.letter-meta .letter-number {
  font-weight: 600;
  color: var(--color-text);
}

.letter-meta .meta-divider {
  color: var(--color-text-soft);
}

.letter-meta time,
.letter-meta .reading-time {
  text-transform: none;
  letter-spacing: 0.02em;
}

.byline {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  font-size: var(--fs-small);
  font-family: var(--font-sans);
  color: var(--color-text-soft);
}

.byline a {
  color: var(--color-text);
  font-weight: 500;
}

.byline-text { display: inline-block; }

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.letter-content .salutation {
  font-style: italic;
  font-size: 1.125em;
  font-weight: 400;
  margin: 0 0 var(--space-md);
  font-family: var(--font-serif);
  line-height: var(--lh-body);
}

.letter-content .emphasis-line {
  font-style: italic;
  text-align: center;
  margin: var(--space-lg) 0;
  font-size: 1.0625em;
  color: var(--color-text);
}

.signature {
  font-style: italic;
  margin-top: var(--space-lg);
  font-size: 1.125em;
}

.postscript {
  margin-top: var(--space-xl);
}

.postscript h2 {
  font-style: italic;
  margin-top: 0;
}

/* ============================================================
   §6.5 — IG CTA card + buttons
   ============================================================ */
.cta-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: var(--space-lg) var(--space-md);
  margin: var(--space-xl) auto;
  max-width: var(--content-width-narrow);
  text-align: center;
}

.cta-card h3 {
  font-family: var(--font-serif);
  font-size: var(--fs-h3);
  font-weight: 600;
  margin: 0 0 var(--space-sm);
}

.cta-card .cta-subheading {
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text-soft);
  margin-bottom: var(--space-md);
  line-height: 1.5;
}

.cta-card .cta-handle {
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  color: var(--color-text-soft);
  margin-top: var(--space-sm);
  margin-bottom: 0;
  letter-spacing: 0.02em;
}

.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  padding: 0.875rem 1.75rem;
  border: none;
  border-radius: 3px;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: background var(--duration-fast) var(--ease);
  min-height: 48px;
  letter-spacing: 0.02em;
}

.btn-primary {
  background: var(--color-accent);
  color: #FFFFFF;
}
.btn-primary:hover, .btn-primary:focus {
  background: var(--color-accent-hover);
  color: #FFFFFF;
  text-decoration: none;
}
.btn:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

/* ============================================================
   §6.6 — Next steps & author bio
   ============================================================ */
.next-steps { margin: var(--space-xl) 0; }
.next-steps p { margin-bottom: var(--space-sm); }
.next-steps .next-step-link { margin-bottom: var(--space-md); }

.next-letter-link {
  display: inline-block;
  font-weight: 500;
  font-size: 1.0625em;
  text-decoration: underline;
}

.author-bio {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  max-width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
}

.author-bio img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.author-bio-text { flex: 1; }

.author-bio-text p {
  font-size: var(--fs-small);
  color: var(--color-text-soft);
  margin: 0;
  line-height: 1.6;
}

.author-bio-text strong { color: var(--color-text); }

@media (max-width: 540px) {
  .author-bio {
    flex-direction: column;
    text-align: left;
  }
}

/* ============================================================
   §6.7 — Share bar
   ============================================================ */
.share-bar {
  margin: var(--space-xl) auto;
  padding: var(--space-md);
  border: 1.5px dashed var(--color-border);
  border-radius: 4px;
  max-width: var(--content-width);
  text-align: center;
}

.share-bar-prompt {
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  color: var(--color-text-soft);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-sm);
}

.share-bar-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-xs);
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  font-weight: 500;
  padding: 0.625rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  background: var(--color-bg);
  color: var(--color-text);
  text-decoration: none;
  cursor: pointer;
  min-height: 44px;
  transition: background var(--duration-fast) var(--ease),
              border-color var(--duration-fast) var(--ease);
}
.share-btn:hover, .share-btn:focus {
  background: var(--color-card-bg);
  border-color: var(--color-text-soft);
  color: var(--color-text);
  text-decoration: none;
}
.share-btn--email {
  border-color: var(--color-text);
}

@media (min-width: 720px) {
  .share-mobile-only { display: none; }
}

/* ============================================================
   §6.8 — Site footer
   ============================================================ */
.site-footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) var(--space-md);
  margin-top: var(--space-xxl);
}

.site-footer-inner {
  max-width: var(--header-width);
  margin: 0 auto;
  text-align: center;
}

.site-footer nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.site-footer a {
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  color: var(--color-text-soft);
  text-decoration: none;
}
.site-footer a:hover, .site-footer a:focus {
  color: var(--color-accent);
  text-decoration: underline;
}

.footer-disclaimer {
  font-family: var(--font-sans);
  font-size: var(--fs-fine-print);
  color: var(--color-text-soft);
  font-style: italic;
  margin-bottom: var(--space-sm);
  max-width: 60ch;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.5;
}

.footer-mailing,
.footer-tagline {
  font-family: var(--font-sans);
  font-size: var(--fs-fine-print);
  color: var(--color-text-soft);
  margin-bottom: var(--space-xs);
}

.footer-attribution {
  font-family: var(--font-sans);
  font-size: var(--fs-fine-print);
  color: var(--color-text-soft);
  margin-top: var(--space-md);
  opacity: 0.8;
}

.footer-attribution a {
  color: var(--color-text-soft);
}

/* ============================================================
   Homepage / Library / Cluster grid components
   ============================================================ */
.hero-letter {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md) var(--space-lg);
}

.hero-letter .salutation {
  font-style: italic;
  font-size: 1.25em;
  margin-bottom: var(--space-md);
}

.hero-letter h1 {
  font-size: var(--fs-h1);
  margin-bottom: var(--space-md);
}

.section-block {
  max-width: var(--content-width);
  margin: var(--space-xl) auto;
  padding: 0 var(--space-md);
}

.library-grid {
  max-width: var(--header-width);
  margin: var(--space-xl) auto;
  padding: 0 var(--space-md);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

.library-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  transition: border-color var(--duration-fast) var(--ease),
              transform var(--duration-fast) var(--ease);
}

.library-card:hover, .library-card:focus {
  border-color: var(--color-text-soft);
  transform: translateY(-2px);
  text-decoration: none;
}

.library-card .card-eyebrow {
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  color: var(--color-accent);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}

.library-card h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  line-height: 1.3;
}

.library-card p {
  font-size: var(--fs-small);
  color: var(--color-text-soft);
  line-height: 1.5;
  margin-bottom: 0;
}

.library-card .card-status {
  font-family: var(--font-sans);
  font-size: var(--fs-fine-print);
  color: var(--color-text-soft);
  margin-top: var(--space-sm);
  font-style: italic;
}

/* Cluster pillar nav */
.cluster-nav {
  max-width: var(--content-width);
  margin: var(--space-xl) auto;
  padding: var(--space-lg) var(--space-md);
  background: var(--color-card-bg);
  border-radius: 4px;
}

.cluster-nav h3 {
  margin-bottom: var(--space-md);
}

.cluster-nav ul {
  list-style: none;
  padding-left: 0;
}

.cluster-nav li {
  margin-bottom: var(--space-sm);
  padding-left: 1em;
  position: relative;
}

.cluster-nav li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* Stub / coming-soon page */
.stub-page {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-xxl) var(--space-md);
  text-align: center;
}

.stub-page h1 {
  margin-bottom: var(--space-md);
}

.stub-page .stub-eyebrow {
  font-family: var(--font-sans);
  font-size: var(--fs-meta);
  color: var(--color-text-soft);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
}

.stub-page .stub-body {
  font-size: 1.125em;
  color: var(--color-text-soft);
  max-width: 540px;
  margin: 0 auto var(--space-lg);
  line-height: 1.6;
}

.stub-page .stub-cta {
  margin-top: var(--space-lg);
}

/* ============================================================
   §6.9 — Reduced motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}