/* ============================================================
   NINETHIRTYFIVE — Design System
   Monochromatic Editorial Theme for Ghost
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Outfit:wght@400;500;600;700;800;900&display=swap');

/* --- Design Tokens --- */
:root {
  /* Monochromatic Palette */
  --color-bg-light: #f5f5f0;
  --color-bg-warm: #eeeee8;
  --color-bg-dark: #1a1a1a;
  --color-bg-black: #111111;
  --color-text-primary: #111111;
  --color-text-secondary: #666666;
  --color-text-tertiary: #999999;
  --color-text-inverse: #ffffff;
  --color-text-inverse-secondary: #aaaaaa;
  --color-border: #e0e0e0;
  --color-border-dark: #333333;
  --color-pill-bg: transparent;
  --color-pill-border: #888888;
  --color-pill-text: #888888;
  --color-pill-bg-dark: transparent;
  --color-pill-border-dark: #666666;
  --color-pill-text-dark: #aaaaaa;

  /* Typography */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 720px;
  --header-height: 64px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-light);
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

a:hover {
  opacity: 0.7;
}

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

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

.container--narrow {
  max-width: var(--max-width-narrow);
}

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

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  background: var(--color-bg-light);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(245, 245, 240, 0.92);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.site-header__logo {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  text-transform: uppercase;
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.site-header__nav-link {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.site-header__nav-link:hover {
  color: var(--color-text-primary);
  opacity: 1;
}

.site-header__nav-link--active {
  color: var(--color-text-primary);
  font-weight: 700;
}

.site-header__subscribe {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 0.45rem 1.1rem;
  border: 1.5px solid var(--color-text-primary);
  border-radius: 3px;
  background: transparent;
  color: var(--color-text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.site-header__subscribe:hover {
  background: var(--color-text-primary);
  color: var(--color-bg-light);
}

/* Mobile nav toggle */
.site-header__menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.site-header__menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text-primary);
  margin: 4px 0;
  transition: all var(--transition-fast);
}

/* ============================================================
   HERO SECTION — Featured Article
   ============================================================ */
.hero {
  background: var(--color-bg-light);
  padding: var(--space-3xl) 0 var(--space-2xl);
}

.hero__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.hero__tag {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-pill-text);
  border: 1px solid var(--color-pill-border);
  border-radius: 2px;
  padding: 0.2rem 0.6rem;
  margin-bottom: var(--space-lg);
}

.hero__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  max-width: 800px;
}

.hero__excerpt {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-bottom: var(--space-lg);
}

.hero__meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--color-text-tertiary);
}

.hero__meta-separator {
  color: var(--color-text-tertiary);
}

.hero__image {
  margin-top: var(--space-2xl);
  border-radius: 4px;
  overflow: hidden;
  aspect-ratio: 21 / 9;
}

.hero__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.hero__link:hover .hero__image img {
  transform: scale(1.02);
}

.hero__link:hover .hero__title {
  opacity: 0.75;
}

.hero__link:hover {
  opacity: 1;
}

/* ============================================================
   ARTICLES GRID — Dark Section
   ============================================================ */
.articles-section {
  background: var(--color-bg-dark);
  padding: var(--space-3xl) 0;
}

.articles-section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2xl);
}

.articles-section__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-inverse-secondary);
}

.articles-section__view-all {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-inverse-secondary);
  transition: color var(--transition-fast);
}

.articles-section__view-all:hover {
  color: var(--color-text-inverse);
  opacity: 1;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2xl);
}

/* ============================================================
   POST CARD
   ============================================================ */
.post-card {
  display: block;
  transition: transform var(--transition-base);
}

.post-card:hover {
  opacity: 1;
  transform: translateY(-2px);
}

.post-card__image {
  border-radius: 4px;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  margin-bottom: var(--space-lg);
  background: var(--color-bg-black);
}

.post-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.post-card:hover .post-card__image img {
  transform: scale(1.03);
}

.post-card__content {
  padding-right: var(--space-lg);
}

.post-card__tag {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-pill-text-dark);
  border: 1px solid var(--color-pill-border-dark);
  border-radius: 2px;
  padding: 0.15rem 0.5rem;
  margin-bottom: var(--space-sm);
}

.post-card__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text-inverse);
  margin-bottom: var(--space-sm);
}

.post-card__meta {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--color-text-inverse-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Light variant for use on light backgrounds */
.post-card--light .post-card__title {
  color: var(--color-text-primary);
}

.post-card--light .post-card__meta {
  color: var(--color-text-tertiary);
}

.post-card--light .post-card__tag {
  color: var(--color-pill-text);
  border-color: var(--color-pill-border);
}

/* ============================================================
   POST PAGE — Single Article
   ============================================================ */
.post-header {
  background: var(--color-bg-light);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.post-header__inner {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  text-align: center;
}

.post-header__tag {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-pill-text);
  border: 1px solid var(--color-pill-border);
  border-radius: 2px;
  padding: 0.2rem 0.6rem;
  margin-bottom: var(--space-lg);
}

.post-header__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
}

.post-header__excerpt {
  font-family: var(--font-body);
  font-size: 1.15rem;
  line-height: 1.55;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.post-header__meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--color-text-tertiary);
}

.post-header__feature-image {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.post-header__feature-image img {
  width: 100%;
  border-radius: 4px;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

/* Article content */
.post-content {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-xl);
}

.post-content h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.6rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: var(--space-3xl) 0 var(--space-lg);
}

.post-content h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.25rem;
  line-height: 1.3;
  margin: var(--space-2xl) 0 var(--space-md);
}

.post-content p {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
}

.post-content blockquote {
  border-left: 3px solid var(--color-text-primary);
  padding-left: var(--space-xl);
  margin: var(--space-2xl) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

.post-content blockquote p {
  font-size: 1.15rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

.post-content img {
  border-radius: 4px;
  margin: var(--space-2xl) 0;
}

.post-content a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.post-content a:hover {
  opacity: 0.7;
}

.post-content ul,
.post-content ol {
  margin: var(--space-lg) 0;
  padding-left: var(--space-xl);
}

.post-content li {
  font-size: 1.05rem;
  line-height: 1.75;
  margin-bottom: var(--space-sm);
}

.post-content code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.9em;
  background: var(--color-bg-warm);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

.post-content pre {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  padding: var(--space-xl);
  border-radius: 4px;
  overflow-x: auto;
  margin: var(--space-2xl) 0;
}

.post-content pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-3xl) 0;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--color-bg-black);
  padding: var(--space-4xl) 0 var(--space-2xl);
  color: var(--color-text-inverse);
}

.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: var(--space-3xl);
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid var(--color-border-dark);
}

.site-footer__brand-name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
}

.site-footer__brand-tagline {
  font-family: var(--font-body);
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--color-text-inverse-secondary);
  max-width: 260px;
}

.site-footer__column-title {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-inverse-secondary);
  margin-bottom: var(--space-lg);
}

.site-footer__links {
  list-style: none;
}

.site-footer__links li {
  margin-bottom: var(--space-sm);
}

.site-footer__links a {
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--color-text-inverse);
  transition: color var(--transition-fast);
}

.site-footer__links a:hover {
  color: var(--color-text-inverse-secondary);
  opacity: 1;
}

/* Newsletter form in footer */
.site-footer__newsletter-text {
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--color-text-inverse-secondary);
  margin-bottom: var(--space-lg);
  line-height: 1.5;
}

.site-footer__newsletter-form {
  display: flex;
  gap: var(--space-sm);
}

.site-footer__newsletter-input {
  flex: 1;
  font-family: var(--font-body);
  font-size: 0.85rem;
  padding: 0.6rem 0.9rem;
  background: var(--color-bg-dark);
  border: 1px solid var(--color-border-dark);
  border-radius: 3px;
  color: var(--color-text-inverse);
  outline: none;
  transition: border-color var(--transition-fast);
}

.site-footer__newsletter-input::placeholder {
  color: var(--color-text-inverse-secondary);
}

.site-footer__newsletter-input:focus {
  border-color: var(--color-text-inverse-secondary);
}

.site-footer__newsletter-submit {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  background: var(--color-text-inverse);
  color: var(--color-bg-black);
  border: none;
  border-radius: 3px;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.site-footer__newsletter-submit:hover {
  opacity: 0.85;
}

/* Footer bottom bar */
.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-xl);
  font-family: var(--font-body);
  font-size: 0.75rem;
  color: var(--color-text-inverse-secondary);
}

.site-footer__social {
  display: flex;
  gap: var(--space-md);
}

.site-footer__social a {
  color: var(--color-text-inverse-secondary);
  transition: color var(--transition-fast);
}

.site-footer__social a:hover {
  color: var(--color-text-inverse);
  opacity: 1;
}

/* ============================================================
   TAG / AUTHOR PAGES
   ============================================================ */
.archive-header {
  background: var(--color-bg-light);
  padding: var(--space-3xl) 0 var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
}

.archive-header__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 2.4rem;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
}

.archive-header__description {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-md);
  max-width: 600px;
}

.archive-grid {
  background: var(--color-bg-light);
  padding: var(--space-3xl) 0;
}

.archive-grid__inner {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2xl);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* ============================================================
   PAGINATION
   ============================================================ */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  padding: var(--space-2xl) 0;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
}

.pagination a {
  font-weight: 600;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  padding: 0.5rem 1.2rem;
  border-radius: 3px;
  transition: all var(--transition-fast);
}

.pagination a:hover {
  background: var(--color-text-primary);
  color: var(--color-bg-light);
  opacity: 1;
}

/* ============================================================
   ERROR PAGE
   ============================================================ */
.error-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
}

.error-page__code {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 6rem;
  letter-spacing: -0.04em;
  color: var(--color-text-primary);
}

.error-page__message {
  font-family: var(--font-body);
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-md);
}

.error-page__link {
  display: inline-block;
  margin-top: var(--space-xl);
  font-weight: 600;
  border: 1px solid var(--color-text-primary);
  padding: 0.6rem 1.4rem;
  border-radius: 3px;
  transition: all var(--transition-fast);
}

.error-page__link:hover {
  background: var(--color-text-primary);
  color: var(--color-bg-light);
  opacity: 1;
}

/* ============================================================
   GHOST CONTENT CARDS — Width Classes
   ============================================================ */
.kg-width-wide {
  max-width: min(1040px, calc(100vw - 4rem));
  margin-left: auto;
  margin-right: auto;
}

.kg-width-full {
  max-width: none;
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
}

.kg-width-wide img,
.kg-width-full img {
  width: 100%;
}

/* ============================================================
   RESPONSIVE — Tablet
   ============================================================ */
@media (max-width: 900px) {
  .articles-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .site-footer__top {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
  }

  .archive-grid__inner {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   RESPONSIVE — Mobile
   ============================================================ */
@media (max-width: 640px) {
  :root {
    --header-height: 56px;
  }

  .site-header__nav {
    display: none;
  }

  .site-header__menu-toggle {
    display: block;
  }

  /* Mobile nav open state */
  .site-header--nav-open .site-header__nav {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg-light);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-xl);
    gap: var(--space-lg);
  }

  .hero__title {
    font-size: 1.8rem;
  }

  .post-header__title {
    font-size: 1.7rem;
  }

  .site-footer__top {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .site-footer__newsletter-form {
    flex-direction: column;
  }

  .site-footer__bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
}