/* ================================================
   neplov Design System — based on DESIGN.md
   ================================================ */

/* --- Google Fonts: Inter (CursorGothic substitute) + JetBrains Mono --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400&display=swap');

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  /* Brand & Accent */
  --color-primary: #f54e00;
  --color-primary-active: #d04200;

  /* Surface */
  --color-canvas: #f7f7f4;
  --color-canvas-soft: #fafaf7;
  --color-surface-card: #ffffff;
  --color-surface-strong: #e6e5e0;

  /* Hairlines */
  --color-hairline: #e6e5e0;
  --color-hairline-soft: #efeee8;
  --color-hairline-strong: #cfcdc4;

  /* Text */
  --color-ink: #26251e;
  --color-body: #5a5852;
  --color-body-strong: #26251e;
  --color-muted: #807d72;
  --color-muted-soft: #a09c92;
  --color-on-primary: #ffffff;

  /* Timeline (AI-action signature) */
  --color-timeline-thinking: #dfa88f;
  --color-timeline-grep: #9fc9a2;
  --color-timeline-read: #9fbbe0;
  --color-timeline-edit: #c0a8dd;
  --color-timeline-done: #c08532;

  /* Semantic */
  --color-error: #cf2d56;
  --color-success: #1f8a65;

  /* Rounded */
  --rounded-none: 0px;
  --rounded-xs: 4px;
  --rounded-sm: 6px;
  --rounded-md: 8px;
  --rounded-lg: 12px;
  --rounded-xl: 16px;
  --rounded-pill: 9999px;
  --rounded-full: 9999px;

  /* Spacing */
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-base: 16px;
  --space-md: 20px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
  --space-section: 80px;

  /* Font Families */
  --font-display: 'Inter', system-ui, 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-code: 'JetBrains Mono', 'Fira Code', monospace;
}

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

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

body {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-body);
  background-color: var(--color-canvas);
}

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

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

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

/* --- Typography Classes --- */
.display-mega {
  font-family: var(--font-display);
  font-size: 72px;
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -2.16px;
  color: var(--color-ink);
}

.display-lg {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.72px;
  color: var(--color-ink);
}

.display-md {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: -0.325px;
  color: var(--color-ink);
}

.display-sm {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: -0.11px;
  color: var(--color-ink);
}

.title-md {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-ink);
}

.title-sm {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-ink);
}

.body-md {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-body);
}

.body-tracked {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.08px;
  color: var(--color-body);
}

.body-sm {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-body);
}

.caption {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 400;
  line-height: 1.4;
  color: var(--color-muted);
}

.caption-uppercase {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  color: var(--color-muted);
}

.code-text {
  font-family: var(--font-code);
  font-size: 13px;
  font-weight: 400;
  line-height: 1.5;
}

/* --- Layout --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-section) 0;
}

/* --- Top Navigation --- */
.top-nav {
  background-color: var(--color-canvas);
  height: 64px;
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--color-hairline-soft);
}

.top-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.top-nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  text-decoration: none;
}

.top-nav__brand img {
  height: 22px;
  width: auto;
}

.top-nav__brand-text {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: -0.5px;
}

.top-nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.top-nav__link {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-ink);
  text-decoration: none;
  transition: color 0.2s ease;
}

.top-nav__link:hover {
  color: var(--color-primary);
}

.top-nav__link--active {
  color: var(--color-primary);
}

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.nav-hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-ink);
  margin: 4px 0;
  transition: all 0.3s ease;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.0;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  border-radius: var(--rounded-md);
  padding: 10px 18px;
  height: 40px;
}

.btn-primary:hover {
  background-color: var(--color-primary-active);
  color: var(--color-on-primary);
}

.btn-secondary {
  background-color: var(--color-surface-card);
  color: var(--color-ink);
  border-radius: var(--rounded-md);
  padding: 9px 17px;
  height: 40px;
  border: 1px solid var(--color-hairline-strong);
}

.btn-secondary:hover {
  border-color: var(--color-ink);
}

.btn-tertiary {
  background-color: transparent;
  color: var(--color-ink);
  padding: 0;
}

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

.btn-download {
  background-color: var(--color-ink);
  color: var(--color-canvas);
  border-radius: var(--rounded-md);
  padding: 12px 20px;
  height: 44px;
}

.btn-download:hover {
  opacity: 0.9;
  color: var(--color-canvas);
}

/* --- Hero Band --- */
.hero-band {
  background-color: var(--color-canvas);
  padding: var(--space-section) 0;
  text-align: center;
}

.hero-band__subtitle {
  margin-top: var(--space-base);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-band__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-base);
  margin-top: var(--space-xl);
}

/* --- Cards --- */
.card {
  background-color: var(--color-surface-card);
  border-radius: var(--rounded-lg);
  border: 1px solid var(--color-hairline);
  padding: var(--space-lg);
}

.feature-card {
  background-color: var(--color-surface-card);
  border-radius: var(--rounded-lg);
  border: 1px solid var(--color-hairline);
  padding: var(--space-lg);
  transition: border-color 0.2s ease;
}

.feature-card:hover {
  border-color: var(--color-hairline-strong);
}

.feature-card__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
}

.feature-card__body {
  color: var(--color-body);
  font-size: 15px;
  line-height: 1.6;
}

.feature-card__meta {
  margin-top: var(--space-base);
  font-size: 14px;
  color: var(--color-muted);
}

.feature-card__tag {
  display: inline-block;
  background-color: var(--color-surface-strong);
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  border-radius: var(--rounded-pill);
  padding: 4px 10px;
  margin-bottom: var(--space-sm);
}

.feature-card__tag--discontinued {
  background-color: var(--color-muted-soft);
  color: var(--color-on-primary);
}

/* Card grid layouts */
.card-grid {
  display: grid;
  gap: var(--space-base);
}

.card-grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.card-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

/* --- Profile Table --- */
.profile-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-lg);
  overflow: hidden;
}

.profile-table th,
.profile-table td {
  padding: var(--space-sm) var(--space-base);
  text-align: left;
  border-bottom: 1px solid var(--color-hairline);
  font-size: 15px;
}

.profile-table th {
  background-color: var(--color-canvas-soft);
  color: var(--color-ink);
  font-weight: 600;
  width: 140px;
  white-space: nowrap;
}

.profile-table td {
  color: var(--color-body);
}

.profile-table tr:last-child th,
.profile-table tr:last-child td {
  border-bottom: none;
}

/* --- Update Timeline --- */
.update-list {
  list-style: none;
}

.update-item {
  display: flex;
  gap: var(--space-base);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-hairline-soft);
  align-items: baseline;
}

.update-item:last-child {
  border-bottom: none;
}

.update-date {
  font-family: var(--font-code);
  font-size: 13px;
  color: var(--color-muted);
  white-space: nowrap;
  min-width: 100px;
}

.update-text {
  font-size: 15px;
  color: var(--color-body);
}

.update-text a {
  color: var(--color-primary);
}

.badge-new {
  display: inline-block;
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-radius: var(--rounded-pill);
  padding: 2px 8px;
  margin-left: var(--space-xs);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* --- Code Block --- */
.code-block {
  background-color: var(--color-surface-card);
  color: var(--color-ink);
  font-family: var(--font-code);
  font-size: 13px;
  line-height: 1.5;
  border-radius: var(--rounded-lg);
  padding: var(--space-md);
  border: 1px solid var(--color-hairline);
  overflow-x: auto;
}

/* --- Badge Pill --- */
.badge-pill {
  display: inline-block;
  background-color: var(--color-surface-strong);
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  border-radius: var(--rounded-pill);
  padding: 4px 10px;
}

/* --- Sidebar / Info Boxes --- */
.info-box {
  background-color: var(--color-surface-card);
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-base);
}

.info-box__title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
}

.info-box__body {
  font-size: 14px;
  color: var(--color-body);
  line-height: 1.6;
}

.info-box__body a {
  color: var(--color-primary);
}

/* --- CTA Band --- */
.cta-band {
  background-color: var(--color-canvas);
  padding: 96px 0;
  text-align: center;
  border-top: 1px solid var(--color-hairline-soft);
}

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

/* --- Footer --- */
.footer {
  background-color: var(--color-canvas);
  border-top: 1px solid var(--color-hairline);
  padding: 64px 0 48px;
}

.footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.footer__brand img {
  height: 18px;
  width: auto;
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
  flex-wrap: wrap;
  justify-content: center;
}

.footer__link {
  font-size: 14px;
  color: var(--color-body);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer__link:hover {
  color: var(--color-ink);
}

.footer__copy {
  font-size: 13px;
  color: var(--color-muted);
  text-align: center;
}

/* --- Breadcrumb --- */
.breadcrumb {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: var(--space-xl);
}

.breadcrumb a {
  color: var(--color-muted);
  text-decoration: none;
}

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

.breadcrumb__sep {
  margin: 0 var(--space-xs);
  color: var(--color-muted-soft);
}

/* --- Section Headers --- */
.section-header {
  margin-bottom: var(--space-xl);
}

.section-header::after {
  content: '';
  display: block;
  width: 100%;
  height: 1px;
  background-color: var(--color-hairline);
  margin-top: var(--space-sm);
}

/* --- Prose / Article Content --- */
.prose {
  max-width: 720px;
}

.prose p {
  margin-bottom: var(--space-base);
  line-height: 1.75;
  color: var(--color-body);
}

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

.prose strong {
  color: var(--color-ink);
  font-weight: 600;
}

.prose a {
  color: var(--color-primary);
}

.prose code {
  font-family: var(--font-code);
  font-size: 13px;
  background-color: var(--color-canvas-soft);
  padding: 2px 6px;
  border-radius: var(--rounded-xs);
  border: 1px solid var(--color-hairline);
}

.prose pre {
  background-color: var(--color-surface-card);
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-lg);
  padding: var(--space-md);
  overflow-x: auto;
  margin: var(--space-lg) 0;
}

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

.prose ul,
.prose ol {
  margin: var(--space-base) 0;
  padding-left: var(--space-lg);
}

.prose li {
  margin-bottom: var(--space-xs);
  line-height: 1.6;
}

.prose blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-base);
  margin: var(--space-lg) 0;
  color: var(--color-muted);
  font-style: italic;
}

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

/* --- AA Art --- */
.aa-art {
  font-family: 'MS PGothic', 'Mona', 'IPAMonaPGothic', sans-serif;
  font-size: 14px;
  line-height: 1.2;
  color: var(--color-muted);
  white-space: pre;
  text-align: left;
  display: inline-block;
}

/* --- Blog Post List --- */
.post-list {
  list-style: none;
}

.post-item {
  display: flex;
  gap: var(--space-base);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-hairline-soft);
  align-items: baseline;
}

.post-item:last-child {
  border-bottom: none;
}

.post-date {
  font-family: var(--font-code);
  font-size: 13px;
  color: var(--color-muted);
  white-space: nowrap;
  min-width: 100px;
}

.post-title-link {
  font-size: 15px;
  color: var(--color-ink);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* --- Two Column Layout (main page) --- */
.page-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--space-xl);
  align-items: start;
}

.page-main {
  min-width: 0;
}

.page-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-base);
  position: sticky;
  top: 80px;
}

/* --- Misc/Utility --- */
.text-ink { color: var(--color-ink); }
.text-body { color: var(--color-body); }
.text-muted { color: var(--color-muted); }
.text-primary { color: var(--color-primary); }
.text-center { text-align: center; }

.mt-xs { margin-top: var(--space-xs); }
.mt-sm { margin-top: var(--space-sm); }
.mt-base { margin-top: var(--space-base); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-xxl { margin-top: var(--space-xxl); }
.mt-section { margin-top: var(--space-section); }

.mb-xs { margin-bottom: var(--space-xs); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-base { margin-bottom: var(--space-base); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

/* --- Responsive --- */

/* Tablet */
@media (max-width: 1024px) {
  .display-mega {
    font-size: 56px;
    letter-spacing: -1.5px;
  }

  .page-layout {
    grid-template-columns: 1fr;
  }

  .page-sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }

  .card-grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile */
@media (max-width: 640px) {
  .display-mega {
    font-size: 32px;
    letter-spacing: -0.8px;
  }

  .display-lg {
    font-size: 26px;
    letter-spacing: -0.5px;
  }

  .display-md {
    font-size: 22px;
  }

  .container {
    padding: 0 var(--space-base);
  }

  .section {
    padding: var(--space-xxl) 0;
  }

  .hero-band {
    padding: var(--space-xxl) 0;
  }

  .hero-band__actions {
    flex-direction: column;
  }

  .card-grid--2,
  .card-grid--3 {
    grid-template-columns: 1fr;
  }

  .page-sidebar {
    grid-template-columns: 1fr;
  }

  .top-nav__links {
    display: none;
  }

  .top-nav__links--open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-canvas);
    border-bottom: 1px solid var(--color-hairline);
    padding: var(--space-lg);
    gap: var(--space-base);
    z-index: 99;
  }

  .nav-hamburger {
    display: block;
  }

  .update-item {
    flex-direction: column;
    gap: var(--space-xxs);
  }

  .post-item {
    flex-direction: column;
    gap: var(--space-xxs);
  }

  .profile-table th {
    width: auto;
  }

  .cta-band {
    padding: var(--space-xxl) 0;
  }

  .footer__links {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }
}