:root {
    --color-text: rgb(209, 213, 219);
    --color-text-heading: rgb(255, 255, 255);
    --color-primary: var(--color-text-heading);
    --color-text-soft: rgb(156, 163, 175);
    --color-background: rgb(17, 17, 17);
    --color-background-soft: rgb(26, 26, 26);
    --color-border: rgb(26, 26, 26);
    --color-accent: rgb(236, 39, 138);
    --color-highlight: rgb(117, 30, 77);
    --color-accent-dark: rgb(143, 0, 81);
    --color-accent-soft: rgb(41, 16, 29);
}

@font-face {
  font-family: 'Geist Mono';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('/fonts/GeistMonoVF-cyrillic.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}

@font-face {
  font-family: 'Geist Mono';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('/fonts/GeistMonoVF-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: 'Geist Mono';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('/fonts/GeistMonoVF-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

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

body {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    color: var(--color-text);
    background: var(--color-background);
    font-family: 'Geist Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
    line-height: 1.6;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--color-text-heading);
  margin-top: 30px;
  margin-bottom: 10px;
}

h1 { font-size: clamp(1.6rem, 3.5vw + 1rem, 2.4rem); }
h2 { font-size: clamp(1.3rem, 2.5vw + 0.8rem, 1.8rem); }
h3 { font-size: clamp(1.1rem, 2vw + 0.6rem, 1.4rem); }

section > h1 {
  font-size: 2rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-accent-dark);
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

strong {
    color: var(--color-text-heading);
    text-transform: uppercase;
}


.accent-color {
    color: var(--color-accent);
}

img, video, svg { max-width: 100%; height: auto; }

@media (max-width: 640px) {
  body { padding: 16px; }
  section > h1 { font-size: 1.6rem; }
}

@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;
  }
}

/* Layout container and background math symbols */
.container {
  display: flex;
  flex-direction: column;
  margin-top: 20px;
  min-height: calc(100vh - 60px);
}

#math-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
  z-index: -1;
}

.math-symbol {
  position: absolute;
  color: var(--color-accent-soft);
  user-select: none;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.today-indicator {
  color: var(--color-text-soft);
  font-size: 0.95rem;
  display: inline-flex;
  gap: 4px;
  align-items: center;
}

.today-indicator strong { color: var(--color-accent); }

.navigation ul {
  display: flex;
  gap: 20px;
  list-style: none;
  margin: 0;
  margin-bottom: 0;
  padding: 0;
}

.navigation a {
  display: inline-block;
  padding: 6px 4px;
}

@media (max-width: 640px) {
  .navigation ul { gap: 12px; flex-wrap: wrap; }
  .navigation a { padding: 8px 2px; font-size: 0.9rem; }
}

/* Search modal */
.search-icon-btn {
  background: transparent;
  border: none;
  padding: 6px;
  margin-left: 8px;
  color: var(--color-accent);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s, box-shadow 0.2s;
}

.search-icon-btn:hover { color: var(--color-accent-dark); }

.search-icon-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.search-icon { display: block; }

.search-modal[hidden] { display: none !important; }

.search-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
}

.search-modal .backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(2px);
}

.search-modal .dialog {
  position: relative;
  background: var(--color-background-soft);
  color: var(--color-text);
  width: min(600px, calc(100vw - 32px));
  margin: 10vh auto 0 auto;
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.search-modal .dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.search-modal .dialog-header h2 {
  font-size: 1.1rem;
  margin: 0;
}

.search-modal .close-btn {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  color: var(--color-text-soft);
}

.search-modal .close-btn:hover { color: var(--color-text); }
.search-modal .close-btn:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

.search-form { display: flex; gap: 8px; }

.search-input {
  flex: 1;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-background);
  color: var(--color-text);
  font-size: 0.95rem;
  font-family: 'Geist Mono', monospace;
}

.search-input::placeholder { color: var(--color-text-soft); }
.search-input:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

.search-submit {
  padding: 10px 14px;
  border-radius: 8px;
  border: none;
  background: var(--color-accent);
  color: #fff;
  cursor: pointer;
  font-family: 'Geist Mono', monospace;
}

.search-submit:hover { filter: brightness(0.95); }
.search-submit:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

/* Articles */
a.article-link {
  color: var(--color-primary);
  transition: color 0.2s;
  overflow-wrap: anywhere;
}

.articles-list {
  margin-bottom: 2rem;
}

a.article-link:hover { color: var(--color-accent); }

.meta { color: var(--color-text-soft); font-size: 0.9em; }

.arrow { font-size: 1em; }

.article { margin: 1.25rem 0 1.75rem; }

.article h2 { margin: 0 0 0.4rem; line-height: 1.3; }

.article p { margin: 0.3rem 0 0; overflow-wrap: anywhere; }

@media (max-width: 640px) {
  .article { margin: 1rem 0 1.25rem; }
}

/* Articles list pagination */
.pagination {
  text-align: center;
  margin-top: 60px;
  font-size: 1em;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.pagination .page-number,
.pagination .prev,
.pagination .next {
  margin: 0 0.5em;
  color: var(--color-text-soft);
}

.page-number:hover,
.prev:hover,
.next:hover { color: var(--color-accent); }

.pagination .page-number.current { font-weight: bold; color: var(--color-accent); }

@media (max-width: 640px) {
  .pagination { margin-top: 36px; }
}

/* Footer */
footer { margin-top: auto; padding: 2rem 0 1rem; }

.footer-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  margin: 1rem auto;
}

.footer-section h3,
.footer-section h4 {
  margin: 0 0 1rem 0;
  font-size: 1rem;
  font-weight: 600;
}

.footer-section p { margin: 0; font-size: 0.9rem; color: var(--color-text-soft); }

.footer-nav { display: flex; flex-direction: column; gap: 0.5rem; }

.footer-nav.social { flex-direction: row; gap: 1rem; }

.footer-nav a {
  text-decoration: none;
  color: var(--color-text-soft);
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer-nav a:hover { color: var(--color-accent); }

.footer-nav.social a { font-weight: bold; font-size: 1rem; }

.footer-bottom { margin-top: 2rem; padding-top: 1rem; text-align: center; }

.footer-bottom p { margin: 0; font-size: 0.8rem; color: var(--color-text-soft); }

@media (max-width: 640px) {
  .footer-content { flex-direction: column; gap: 1.25rem; }
  .footer-section h3,
  .footer-section h4 { font-size: 0.95rem; }
}

/* Hero and page-specific typography */
.logo { font-weight: bold; font-size: 3rem; }

.tagline {
  margin: 0 0 1rem 0;
  font-size: 1.2rem; 
}

.hero {
  display: flex;
  flex-direction: column;
  margin: 1rem 0;
}

/* Homepage hero layout */
.hero-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
}

.hero-header h1 {
  margin: 0;
}

.hero-header .today-indicator {
  margin: 0;
}

/* Search page tagline tweak */
/* Also used generally for soft tagline color where needed */
.tagline.search, .tagline.search-page, section.hero + .tagline, .tagline.soft { color: var(--color-text-soft); }

/* Highlighted search term */
.hl {
  color: inherit;
  padding: 0 0.25em;
  border-radius: 2px;
  border: 1px solid var(--color-accent);
}

@media (max-width: 640px) {
  .logo { font-size: 2.2rem; }
  .tagline { font-size: 1rem; }
  .hero-header { align-items: center; }
}

/* Error page */
.error-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 80px - 40px);
  text-align: center;
  padding: 40px 20px;
}

.error-code {
  font-size: 8rem;
  font-weight: 900;
  color: var(--color-accent);
  line-height: 1;
  margin: 0;
}

.error-message { font-size: 1.5rem; margin: 20px 0; color: var(--color-text-heading); }

.error-description { font-size: 1rem; color: var(--color-text-soft); margin-bottom: 40px; max-width: 500px; }

.back-link {
  padding: 12px 24px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-background-soft);
  transition: all 0.2s;
}

.back-link:hover { border-color: var(--color-accent); background: var(--color-background); }

@media (max-width: 640px) {
  .error-code { font-size: 4.5rem; }
  .error-message { font-size: 1.25rem; }
}