/* SVIL Ghost Theme — Design tokens (DESIGN.md) */

:root {
  --color-background: #131315;
  --color-surface: #131315;
  --color-surface-deep: #000000;
  --color-surface-subtle: #18181B;
  --color-surface-container-lowest: #0e0e10;
  --color-surface-container-low: #1c1b1d;
  --color-surface-container: #201f22;
  --color-surface-container-high: #2a2a2c;
  --color-surface-container-highest: #353437;
  --color-on-surface: #e5e1e4;
  --color-on-surface-variant: #c7c4d7;
  --color-primary: #c0c1ff;
  --color-on-primary: #1000a9;
  --color-secondary: #ddb7ff;
  --color-tertiary: #4cd7f6;
  --color-outline: #908fa0;
  --color-outline-variant: #464554;
  --color-border-muted: #27272A;
  --color-text-high: #FFFFFF;
  --color-text-muted: rgba(255, 255, 255, 0.75);

  --space-base: 8px;
  --space-section-gap: 120px;
  --space-container: 1100px;
  --space-gutter: 24px;
  --space-margin-mobile: 20px;
  --space-margin: 20px;
  --space-stack-sm: 12px;
  --space-stack-md: 32px;

  --radius-sm: 0.125rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-card: 12px;

  --nav-height: 64px;
  --mouse-x: 50%;
  --mouse-y: 50%;
}

/* ==========================================================================
   Base
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Hanken Grotesk', 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  background-color: var(--color-background);
  color: var(--color-on-surface);
  -webkit-font-smoothing: antialiased;
}

body ::selection {
  background-color: rgba(192, 193, 255, 0.3);
}

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

a {
  color: inherit;
  text-decoration: none;
}

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

.site-main {
  padding-top: var(--nav-height);
  min-height: calc(100vh - var(--nav-height));
}

/* Typography utilities */
.text-display-hero {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.text-display-mobile {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.text-headline-lg {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
}

.text-headline-md {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.4;
}

.text-body-readable {
  font-size: 18px;
  font-weight: 400;
  line-height: 1.7;
}

.text-label-mono {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
  line-height: 1;
}

.readability-mode .gh-content,
.readability-mode .post-card__excerpt {
  font-size: 22px;
  line-height: 1.8;
}

.readability-mode .color-text-muted,
.readability-mode .post-card__meta {
  color: rgba(255, 255, 255, 0.85);
}

.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
  font-size: 24px;
  line-height: 1;
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 var(--space-margin);
  background: rgba(19, 19, 21, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(70, 69, 84, 0.3);
}

.site-nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-base);
  color: var(--color-primary);
  font-weight: 700;
  min-height: 48px;
}

.site-nav__brand {
  font-size: 24px;
  font-weight: 700;
}

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

.btn-icon,
.btn-readability {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  min-height: 48px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--color-on-surface-variant);
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.btn-icon:hover,
.btn-readability:hover {
  opacity: 0.8;
}

.btn-readability {
  padding: 0 12px;
  min-width: auto;
  border: 1px solid rgba(192, 193, 255, 0.2);
  border-radius: 9999px;
  background: rgba(192, 193, 255, 0.1);
  color: var(--color-primary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
}

.btn-readability[aria-pressed="true"] {
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-color: var(--color-primary);
}

.site-nav__links {
  display: none;
}

.site-nav__links ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: var(--space-gutter);
}

.site-nav__links li {
  display: flex;
}

.site-nav__links a {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  color: var(--color-on-surface-variant);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.site-nav__links a:hover,
.site-nav__links .nav-current {
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .site-nav__links {
    display: block;
  }
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 460px;
  background-color: var(--color-surface-deep);
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

.hero--no-image {
  background-image: url('../images/hero-cover.png');
  background-size: cover;
  background-position: center;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.4) 0%, rgba(19, 19, 21, 1) 100%);
}

.hero__content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--space-container);
  padding: var(--space-stack-md) var(--space-margin);
  text-align: center;
}

.hero__eyebrow {
  margin: 0 0 var(--space-stack-sm);
  color: rgba(255, 255, 255, 0.6);
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.hero__title {
  margin: 0 0 var(--space-base);
  color: var(--color-text-high);
}

.hero__desc {
  margin: 0 0 var(--space-stack-md);
  color: rgba(255, 255, 255, 0.8);
  font-size: 18px;
  line-height: 1.6;
}

.hero__actions {
  display: flex;
  gap: var(--space-gutter);
  justify-content: center;
  flex-wrap: wrap;
  align-items: center;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 28px;
  border-radius: var(--radius-lg);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: 700;
  font-size: 16px;
  transition: opacity 0.2s ease, transform 0.15s ease;
}

.hero__cta:hover {
  opacity: 0.9;
  color: var(--color-on-primary);
}

.hero__cta:active {
  transform: scale(0.98);
}

.hero__scroll-link {
  color: rgba(255, 255, 255, 0.6);
  transition: color 0.2s ease;
}

.hero__scroll-link:hover {
  color: var(--color-primary);
}

/* ==========================================================================
   YouTube banner (히어로 밑 채널 링크)
   ========================================================================== */

.youtube-banner {
  max-width: var(--space-container);
  margin: 0 auto;
  padding: 0 var(--space-margin);
  margin-top: -40px;
  position: relative;
  z-index: 2;
}

.youtube-banner__link {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 50px;
  padding: 20px 24px;
  border-radius: var(--radius-card);
  background: var(--color-surface-container);
  border: 1px solid var(--color-border-muted);
  color: var(--color-text-high);
  transition: border-color 0.2s ease, transform 0.15s ease, background 0.2s ease;
}

.youtube-banner__link:hover {
  border-color: #FF0000;
  background: var(--color-surface-container-high);
  color: var(--color-text-high);
  transform: translateY(-2px);
}

.youtube-banner__link:active {
  transform: translateY(0);
}

.youtube-banner__icon {
  display: inline-flex;
  flex-shrink: 0;
}

.youtube-banner__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  min-width: 0;
}

.youtube-banner__title {
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
}

.youtube-banner__desc {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.youtube-banner__cta {
  flex-shrink: 0;
  color: var(--color-primary);
}

@media (max-width: 600px) {
  .youtube-banner__link {
    gap: 16px;
    padding: 16px 18px;
    flex-wrap: wrap;
  }

  .youtube-banner__cta {
    width: 100%;
    text-align: right;
  }
}

/* ==========================================================================
   Subscribe forms
   ========================================================================== */

.subscribe-form {
  max-width: 28rem;
  margin: 0 auto;
}

.subscribe-form--hero form {
  display: flex;
  flex-direction: column;
  gap: var(--space-base);
  padding: 6px;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(70, 69, 84, 0.3);
  background: rgba(32, 31, 34, 0.4);
  backdrop-filter: blur(12px);
}

.subscribe-form--cta form {
  display: flex;
  flex-direction: column;
  gap: var(--space-stack-sm);
}

.subscribe-form input[type="email"],
.gh-subscribe-input {
  width: 100%;
  min-height: 48px;
  padding: 12px 16px;
  border: none;
  border-radius: var(--radius-lg);
  background: transparent;
  color: var(--color-on-surface);
  font-family: inherit;
  font-size: 16px;
}

.subscribe-form--cta input[type="email"],
.subscribe-form--cta .gh-subscribe-input {
  background: var(--color-surface-container-high);
  border: 1px solid var(--color-border-muted);
}

.subscribe-form input::placeholder,
.gh-subscribe-input::placeholder {
  color: var(--color-text-muted);
}

.subscribe-form input:focus,
.gh-subscribe-input:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.subscribe-form button,
.gh-subscribe-btn {
  min-height: 48px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.15s ease;
}

.subscribe-form button:hover,
.gh-subscribe-btn:hover {
  opacity: 0.9;
}

.subscribe-form button:active,
.gh-subscribe-btn:active {
  transform: scale(0.98);
}

.gh-subscribe-error,
.gh-subscribe-success {
  margin-top: var(--space-base);
  font-size: 14px;
}

.gh-subscribe-success {
  color: var(--color-tertiary);
}

.gh-subscribe-error {
  color: #ffb4ab;
}

/* ==========================================================================
   Post list
   ========================================================================== */

.post-list {
  padding: var(--space-stack-md) var(--space-margin);
}

.post-list__inner {
  max-width: var(--space-container);
  margin: 0 auto;
}

.section-header {
  display: flex;
  align-items: center;
  gap: var(--space-gutter);
  margin-bottom: var(--space-stack-md);
}

.section-header__label {
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  white-space: nowrap;
}

.section-divider {
  flex: 1;
  height: 1px;
  background: rgba(70, 69, 84, 0.3);
}

.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-base);
  margin-bottom: var(--space-stack-md);
}

.tag-filter__chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 9999px;
  border: 1px solid var(--color-border-muted);
  background: transparent;
  color: var(--color-on-surface-variant);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  white-space: nowrap;
  min-height: 36px;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.tag-filter__chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(192, 193, 255, 0.08);
}

.post-list__items {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-gutter);
}

.post-list__items .post-card__title.text-headline-lg,
.post-list__items .post-card__title {
  font-size: 22px;
  line-height: 1.3;
}

.post-list__items .post-card__excerpt {
  font-size: 14px;
  -webkit-line-clamp: 2;
}

/* ==========================================================================
   Post card
   ========================================================================== */

.post-card {
  transition: transform 0.3s ease;
}

.post-card:hover {
  transform: translateY(-4px);
}

.post-card__image-wrap {
  display: block;
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  margin-bottom: var(--space-base);
  overflow: hidden;
  border-radius: var(--radius-card);
  border: 1px solid var(--color-border-muted);
}

.post-card__image-wrap img {
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  transition: transform 0.7s ease;
}

.post-card:hover .post-card__image-wrap img {
  transform: scale(1.05);
}

.post-card__title {
  margin: 0 0 var(--space-stack-sm);
}

.post-card__title a {
  color: var(--color-text-high);
  transition: color 0.2s ease;
}

.post-card:hover .post-card__title a {
  color: var(--color-primary);
}

.post-card__excerpt {
  margin: 0 0 var(--space-base);
  color: var(--color-on-surface-variant);
  font-size: 16px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-stack-sm);
  color: var(--color-text-muted);
}

.post-card__author {
  font-weight: 600;
  color: var(--color-primary);
}

.post-card__sep {
  opacity: 0.3;
}

.reading-time {
  color: var(--color-text-muted);
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: var(--space-gutter);
  margin-top: var(--space-section-gap);
  padding: var(--space-stack-md) 0;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  min-height: 48px;
  padding: 0 16px;
  border: 1px solid var(--color-border-muted);
  border-radius: var(--radius-lg);
  color: var(--color-on-surface-variant);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}

.pagination .pagination-current {
  background: rgba(192, 193, 255, 0.1);
  border-color: rgba(192, 193, 255, 0.2);
  color: var(--color-primary);
}

/* ==========================================================================
   Newsletter CTA
   ========================================================================== */

.newsletter-cta {
  margin-top: var(--space-section-gap);
  padding: 96px var(--space-margin);
  background: var(--color-surface-container-lowest);
  border-top: 1px solid rgba(70, 69, 84, 0.2);
  border-bottom: 1px solid rgba(70, 69, 84, 0.2);
}

.newsletter-cta__inner {
  max-width: var(--space-container);
  margin: 0 auto;
  text-align: center;
}

.newsletter-cta__icon {
  display: block;
  margin: 0 auto var(--space-gutter);
  width: 48px;
  height: 48px;
  color: var(--color-primary);
}

.newsletter-cta h2 {
  margin: 0 0 var(--space-base);
  color: var(--color-on-surface);
}

.newsletter-cta__desc {
  margin: 0 0 40px;
  color: var(--color-on-surface-variant);
  opacity: 0.7;
}

/* ==========================================================================
   Search & tag archives
   ========================================================================== */

.search-page,
.tag-archive,
.author-archive {
  padding: var(--space-stack-md) var(--space-margin) var(--space-section-gap);
}

.search-page__inner,
.tag-archive__inner,
.author-archive__inner {
  max-width: var(--space-container);
  margin: 0 auto;
}

.search-page__header,
.tag-archive__header,
.author-archive__header {
  margin-bottom: var(--space-stack-md);
}

.search-page__label,
.tag-archive__label,
.author-archive__label {
  display: block;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: var(--space-base);
}

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

.author-archive__avatar {
  margin: 0 auto var(--space-gutter);
  border-radius: 50%;
  border: 1px solid var(--color-border-muted);
  object-fit: cover;
}

.author-archive__bio {
  margin: var(--space-base) auto 0;
  max-width: 560px;
  color: var(--color-on-surface-variant);
  font-size: 18px;
  line-height: 1.7;
}

.author-archive__website {
  display: inline-block;
  margin-top: var(--space-base);
  color: var(--color-primary);
}

.tag-archive__desc {
  margin: var(--space-base) 0 0;
  color: var(--color-on-surface-variant);
  font-size: 18px;
  line-height: 1.7;
}

.search-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-stack-sm);
  margin-bottom: var(--space-section-gap);
  max-width: 560px;
}

.search-form__input {
  min-height: 48px;
  padding: 12px 16px;
  border: 1px solid var(--color-border-muted);
  border-radius: var(--radius-lg);
  background: var(--color-surface-container-high);
  color: var(--color-on-surface);
  font-family: inherit;
  font-size: 16px;
}

.search-form__input:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.search-form__submit {
  align-self: flex-start;
}

.search-page__empty {
  color: var(--color-on-surface-variant);
}

.search-page__results {
  margin-top: var(--space-stack-md);
}

@media (min-width: 768px) {
  .search-form {
    flex-direction: row;
    align-items: stretch;
  }

  .search-form__input {
    flex: 1;
  }
}

/* ==========================================================================
   Post detail
   ========================================================================== */

.post__hero-image {
  margin: 0;
  max-height: 480px;
  overflow: hidden;
}

.post__hero-image img {
  width: 100%;
  height: 480px;
  object-fit: cover;
}

.post__container,
.page__container {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-stack-md) var(--space-margin) var(--space-section-gap);
}

.post__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-base);
  margin-bottom: var(--space-gutter);
}

.tag-chip {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text-high);
  text-transform: uppercase;
  font-size: 11px;
  transition: background 0.2s ease;
}

.tag-chip:hover {
  background: rgba(192, 193, 255, 0.15);
  color: var(--color-primary);
}

.post__title,
.page__title {
  margin: 0 0 var(--space-gutter);
  color: var(--color-text-high);
}

.post__meta {
  display: flex;
  align-items: center;
  gap: var(--space-stack-sm);
  margin-bottom: var(--space-stack-md);
  color: var(--color-text-muted);
}

.post__meta-sep {
  opacity: 0.3;
}

.page__feature-image {
  margin: 0 0 var(--space-stack-md);
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--color-border-muted);
}

/* ==========================================================================
   Ghost content (kg-card, prose)
   ========================================================================== */

.gh-content {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-on-surface);
}

.gh-content > * + * {
  margin-top: 1.25em;
}

.gh-content h1,
.gh-content h2,
.gh-content h3,
.gh-content h4 {
  color: var(--color-text-high);
  line-height: 1.3;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.gh-content h2 {
  font-size: 32px;
  font-weight: 700;
}

.gh-content h3 {
  font-size: 24px;
  font-weight: 600;
}

.gh-content a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.gh-content img {
  border-radius: var(--radius-card);
  margin: 1.5em auto;
}

.gh-content blockquote {
  margin: 1.5em 0;
  padding-left: 1em;
  border-left: 3px solid var(--color-primary);
  color: var(--color-on-surface-variant);
  font-style: italic;
}

.gh-content pre,
.gh-content code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9em;
}

.gh-content pre {
  padding: 1em;
  overflow-x: auto;
  border-radius: var(--radius-lg);
  background: var(--color-surface-container);
  border: 1px solid var(--color-border-muted);
}

.gh-content :not(pre) > code {
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  background: var(--color-surface-container-high);
}

.gh-content ul,
.gh-content ol {
  padding-left: 1.5em;
}

.gh-content hr {
  border: none;
  border-top: 1px solid var(--color-border-muted);
  margin: 2em 0;
}

.kg-card {
  margin: 2em 0;
}

.kg-image-card img {
  width: 100%;
}

.kg-width-wide {
  position: relative;
  width: 85vw;
  max-width: min(85vw, 960px);
  margin-left: auto;
  margin-right: auto;
}

.kg-width-full {
  position: relative;
  width: 100vw;
  left: 50%;
  right: 50%;
  margin-left: -50vw;
  margin-right: -50vw;
}

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

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background: var(--color-surface-deep);
  border-top: 1px solid rgba(70, 69, 84, 0.2);
  padding: 64px var(--space-margin) 48px;
}

.site-footer__inner {
  max-width: var(--space-container);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 40px;
}

.site-footer__logo {
  display: block;
  font-size: 24px;
  color: var(--color-on-surface);
  margin-bottom: var(--space-base);
}

.site-footer__brand p {
  margin: 0;
  max-width: 280px;
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.5;
}

.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-gutter);
}

.site-footer__nav a {
  color: var(--color-on-surface-variant);
  min-height: 48px;
  display: inline-flex;
  align-items: center;
}

.site-footer__nav a:hover {
  color: var(--color-primary);
}

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

.social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-surface-container-high);
  border: 1px solid rgba(70, 69, 84, 0.3);
  color: var(--color-on-surface-variant);
  transition: border-color 0.2s ease;
}

.social-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.social-btn svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.site-footer__copy {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 12px;
  opacity: 0.6;
  line-height: 1.6;
}

.site-footer__copy a {
  text-decoration: underline;
  text-decoration-color: rgba(192, 193, 255, 0.4);
}

/* ==========================================================================
   Error page
   ========================================================================== */

.error-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: var(--space-stack-md) var(--space-margin);
}

.error-page__inner {
  text-align: center;
  max-width: 480px;
}

.error-page__code {
  color: var(--color-primary);
  margin: 0 0 var(--space-base);
}

.error-page__title {
  margin: 0 0 var(--space-base);
  color: var(--color-text-high);
}

.error-page__desc {
  margin: 0 0 var(--space-stack-md);
  color: var(--color-on-surface-variant);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 24px;
  border-radius: var(--radius-lg);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: 700;
  transition: opacity 0.2s ease;
}

.btn-primary:hover {
  opacity: 0.9;
  color: var(--color-on-primary);
}

/* ==========================================================================
   Mouse glow (desktop)
   ========================================================================== */

.mouse-glow {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 30;
  opacity: 0;
  transition: opacity 0.3s ease;
  background: radial-gradient(
    600px at var(--mouse-x) var(--mouse-y),
    rgba(192, 193, 255, 0.03),
    transparent 80%
  );
}

body:not(.readability-mode):hover .mouse-glow {
  opacity: 1;
}

/* ==========================================================================
   Responsive — tablet/desktop (768px+)
   ========================================================================== */

@media (min-width: 768px) {
  :root {
    --space-margin: 40px;
  }

  .text-display-mobile,
  .hero__title {
    font-size: 56px;
    line-height: 1.1;
    letter-spacing: -0.04em;
  }

  .text-headline-lg {
    font-size: 36px;
  }

  .post-list__items {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-gutter);
  }

  .post-list__items .post-card__title.text-headline-lg,
  .post-list__items .post-card__title {
    font-size: 20px;
  }

  .hero {
    min-height: 560px;
  }

  .hero__content {
    padding-top: var(--space-section-gap);
    padding-bottom: var(--space-section-gap);
  }

  .subscribe-form--hero form {
    flex-direction: row;
    align-items: stretch;
  }

  .subscribe-form--hero input[type="email"],
  .subscribe-form--hero .gh-subscribe-input {
    flex: 1;
  }

  .subscribe-form--hero button,
  .subscribe-form--hero .gh-subscribe-btn {
    flex-shrink: 0;
  }

  .subscribe-form--cta form {
    flex-direction: row;
    align-items: stretch;
    max-width: 32rem;
    margin: 0 auto;
  }

  .subscribe-form--cta input[type="email"],
  .subscribe-form--cta .gh-subscribe-input {
    flex: 1;
  }

  .site-footer__inner {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
    text-align: left;
  }

  .site-footer__brand {
    flex: 1 1 280px;
  }

  .site-footer__nav {
    flex: 1 1 auto;
    justify-content: flex-end;
  }

  .site-footer__social {
    flex: 0 0 auto;
  }

  .site-footer__copy {
    flex: 1 1 100%;
    text-align: center;
  }

  .post__container,
  .page__container {
    padding-top: var(--space-stack-md);
    padding-bottom: var(--space-section-gap);
  }
}

@media (min-width: 1280px) {
  :root {
    --space-margin: 48px;
  }
}

@media (max-width: 374px) {
  .text-display-mobile,
  .hero__title {
    font-size: 28px;
  }

  .text-headline-lg,
  .post-card__title {
    font-size: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .post-card:hover {
    transform: none;
  }

  .mouse-glow {
    display: none;
  }
}