/* ============================================================
   railreader2 — shared stylesheet
   ============================================================ */

:root {
  --max-width: 860px;
  --font-body: 'Nunito Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Fira Mono', 'Consolas', 'Courier New', monospace;
}

/* ---- Dark theme (default) ---- */
[data-theme="dark"] {
  --bg: #141c2b;
  --fg: #fff;
  --fg-muted: #a0aec0;
  --accent: #63b3ed;
  --accent-hover: #90cdf4;
  --card-bg: #1a2435;
  --card-border: #2d3a4e;
  --stripe-color: #fff;
  --logo-bg: #fff;
  --logo-fg: #141c2b;
  --toggle-bg: #1a2435;
  --toggle-border: #2d3a4e;
  --lightbox-bg: rgba(0, 0, 0, 0.85);
  --note-bg: #1a2435;
  --note-border: #63b3ed;
}

/* ---- Light theme ---- */
[data-theme="light"] {
  --bg: #f7f8fa;
  --fg: #1a202c;
  --fg-muted: #5a6577;
  --accent: #2b6cb0;
  --accent-hover: #1a4d80;
  --card-bg: #ffffff;
  --card-border: #d8dde6;
  --stripe-color: #1a202c;
  --logo-bg: #1a202c;
  --logo-fg: #f7f8fa;
  --toggle-bg: #ffffff;
  --toggle-border: #d8dde6;
  --lightbox-bg: rgba(0, 0, 0, 0.7);
  --note-bg: #eef5fc;
  --note-border: #2b6cb0;
}

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

body {
  background-color: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  transition: background-color 0.3s, color 0.3s;
}

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

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

/* ---- Header ---- */
.header {
  padding: 2rem 1.5rem 0;
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.header__left {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.header__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.45rem 1rem;
  background-color: var(--logo-bg);
  color: var(--logo-fg);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.35rem;
  position: relative;
  margin-right: 0.5rem;
  transition: background-color 0.3s, color 0.3s;
}

.header__logo img {
  height: 32px;
  width: auto;
  transition: filter 0.3s;
}

[data-theme="light"] .header__logo img {
  filter: invert(1);
}

.header__logo::after {
  content: '';
  display: block;
  position: absolute;
  top: 0;
  right: -12px;
  bottom: 0;
  width: 48px;
  background: repeating-linear-gradient(
    90deg,
    var(--stripe-color),
    var(--stripe-color) 2px,
    transparent 0,
    transparent 10px
  );
  transition: background 0.3s;
}

.header nav {
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.header nav a {
  margin-right: 1.5rem;
  color: var(--accent);
}

/* ---- Theme toggle ---- */
.theme-toggle {
  background: var(--toggle-bg);
  border: 1px solid var(--toggle-border);
  color: var(--fg);
  font-size: 1.2rem;
  width: 2.4rem;
  height: 2.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.3s, border-color 0.3s;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

/* ---- Lightbox ---- */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--lightbox-bg);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.lightbox.active {
  display: flex;
}

.lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border: 1px solid var(--card-border);
}

/* ---- Code ---- */
code {
  font-family: var(--font-mono);
  background-color: var(--card-bg);
  padding: 0.15rem 0.4rem;
  font-size: 0.85em;
  border: 1px solid var(--card-border);
  transition: background-color 0.3s, border-color 0.3s;
}

pre {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: 1rem;
  line-height: 1.5;
}

pre code {
  background: none;
  border: none;
  padding: 0;
}

/* ---- Keyboard shortcuts table ---- */
.shortcuts-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.shortcuts-table th {
  text-align: left;
  font-family: var(--font-mono);
  color: var(--accent);
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid var(--card-border);
}

.shortcuts-table td {
  padding: 0.4rem 0.8rem;
  border-bottom: 1px solid var(--card-border);
}

.shortcuts-table td:first-child {
  font-family: var(--font-mono);
  white-space: nowrap;
  width: 180px;
}

.shortcuts-table td:last-child {
  color: var(--fg-muted);
}

/* ---- Footer ---- */
.footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  font-size: 0.85rem;
  color: var(--fg-muted);
  font-family: var(--font-mono);
  border-top: 1px solid var(--card-border);
}

.footer a {
  color: var(--fg-muted);
}

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

/* ---- Skip link ---- */
.skip-link {
  position: absolute;
  top: -3rem;
  left: 1rem;
  background: var(--fg);
  color: var(--bg);
  padding: 0.5rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  z-index: 9999;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 1rem;
}

/* ---- Screen-reader only ---- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   Index page
   ============================================================ */

/* ---- Hero ---- */
.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 2rem;
}

.hero h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.hero p {
  color: var(--fg-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin-bottom: 1.5rem;
}

.hero__buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  border: 2px solid var(--fg);
  color: var(--fg);
  transition: background-color 0.2s, color 0.2s;
}

.btn:hover {
  background-color: var(--fg);
  color: var(--bg);
}

.btn--primary {
  background-color: var(--fg);
  color: var(--bg);
}

.btn--primary:hover {
  background-color: transparent;
  color: var(--fg);
}

/* ---- Demo ---- */
.demo {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 2rem;
}

.demo__container {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  overflow: hidden;
  transition: background-color 0.3s, border-color 0.3s;
}

.demo__container img {
  width: 100%;
  height: auto;
  display: block;
}

.demo__caption {
  padding: 0.8rem 1rem;
  font-size: 0.9rem;
  color: var(--fg-muted);
  font-family: var(--font-mono);
}

/* ---- Sections ---- */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.section h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
}

.section h2::before {
  content: '# ';
  color: var(--accent);
}

/* ---- Story ---- */
.story {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-left: 3px solid var(--accent);
  padding: 1.5rem 1.8rem;
  margin-bottom: 1rem;
  line-height: 1.8;
  transition: background-color 0.3s, border-color 0.3s;
}

.story p {
  color: var(--fg-muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.story p:last-child {
  margin-bottom: 0;
}

.story strong {
  color: var(--fg);
}

/* ---- Note callout ---- */
.note {
  background-color: var(--note-bg);
  border: 1px solid var(--note-border);
  border-left: 3px solid var(--note-border);
  padding: 1rem 1.4rem;
  margin-top: 1rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--fg-muted);
  transition: background-color 0.3s, border-color 0.3s;
}

.note strong {
  color: var(--fg);
}

/* ---- Screenshots ---- */
.screenshots {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.screenshots__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.screenshot {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  overflow: hidden;
  transition: background-color 0.3s, border-color 0.3s;
}

.screenshot img {
  width: 100%;
  height: auto;
  display: block;
  cursor: pointer;
  transition: opacity 0.2s;
}

.screenshot img:hover {
  opacity: 0.9;
}

.screenshot figcaption {
  padding: 0.6rem 0.8rem;
  font-size: 0.85rem;
  color: var(--fg-muted);
}

/* ---- Features ---- */
.features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.feature {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 1.2rem;
  transition: background-color 0.3s, border-color 0.3s;
}

.feature h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
}

.feature p {
  color: var(--fg-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ---- Getting Started (steps) ---- */
.steps {
  counter-reset: step;
  list-style: none;
}

.steps li {
  counter-increment: step;
  margin-bottom: 1rem;
  padding-left: 2rem;
  position: relative;
}

.steps li::before {
  content: counter(step) '.';
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
}

/* ============================================================
   Guide page
   ============================================================ */

/* ---- Content wrapper ---- */
.content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

.content h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.content > p.subtitle {
  color: var(--fg-muted);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

/* ---- Table of contents ---- */
.toc {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 1.2rem 1.5rem;
  margin-bottom: 2.5rem;
}

.toc h2 {
  font-size: 1rem;
  font-family: var(--font-mono);
  margin-bottom: 0.6rem;
}

.toc ol {
  padding-left: 1.5rem;
  font-size: 0.95rem;
}

.toc li { margin-bottom: 0.3rem; }

/* ---- Guide sections ---- */
.guide-section {
  margin-bottom: 3rem;
}

.guide-section h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--card-border);
}

.guide-section h2::before {
  content: '# ';
  color: var(--accent);
}

.guide-section h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 1.2rem 0 0.5rem;
  font-family: var(--font-mono);
}

.guide-section p {
  color: var(--fg-muted);
  margin-bottom: 0.8rem;
}

.guide-section p strong { color: var(--fg); }

.guide-section ul, .guide-section ol {
  padding-left: 1.5rem;
  color: var(--fg-muted);
  margin-bottom: 0.8rem;
}

.guide-section li { margin-bottom: 0.3rem; }

/* ---- Guide screenshots ---- */
.guide-screenshot {
  margin: 1rem 0 1.5rem;
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  overflow: hidden;
  max-width: 600px;
}

.guide-screenshot img {
  width: 100%;
  height: auto;
  display: block;
  cursor: pointer;
  transition: opacity 0.2s;
}

.guide-screenshot img:hover { opacity: 0.9; }

.guide-screenshot figcaption {
  padding: 0.5rem 0.8rem;
  font-size: 0.85rem;
  color: var(--fg-muted);
}

/* ---- Tip boxes ---- */
.tip {
  background-color: var(--card-bg);
  border-left: 3px solid var(--accent);
  padding: 0.8rem 1rem;
  margin: 1rem 0;
  font-size: 0.9rem;
}

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

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 600px) {
  /* Shared */
  .header {
    flex-direction: column;
  }

  .header__logo {
    font-size: 1.15rem;
  }

  .header__logo img {
    height: 26px;
  }

  /* Index */
  .screenshots__row,
  .features {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .hero__buttons {
    flex-direction: column;
  }

  .btn {
    text-align: center;
  }

  /* Guide */
  .content h1 {
    font-size: 1.5rem;
  }

  .guide-screenshot {
    max-width: 100%;
  }
}