:root {
  --color-primary: #2563eb;
  --color-text: #1f2937;
  --color-muted: #6b7280;
  --color-bg: #ffffff;
  --color-border: #e5e7eb;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --max-width: 42rem;
  --content-max: 1100px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --radius: 8px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
}

body.nav-open { overflow: hidden; }

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

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

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

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--color-primary);
  z-index: 1000;
}

body.has-theme-skin .reading-progress {
  background: var(--gh-accent, var(--p100-accent, var(--color-primary)));
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  border-bottom: 1px solid var(--color-border);
  padding: 0;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
}

/* Ghost chrome header — no extra border (see skin-chrome.css) */
.site-header--ghost {
  border-bottom: none;
  padding: 0;
  backdrop-filter: none;
}

.header-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  box-sizing: border-box;
}

.logo {
  font-weight: 700;
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--color-primary);
  text-decoration: none;
  line-height: 1.2;
}

.site-header--skin .logo {
  color: var(--p100-accent, var(--color-primary));
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.35rem 1.25rem;
}

.site-nav a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
}

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

.site-header--skin .site-nav a:hover {
  color: var(--p100-accent, var(--color-primary));
}

/* Mobile drawer (shared with skin chrome — 70% width from left) */
.site-nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 799;
  background: rgba(0, 0, 0, 0.45);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
  pointer-events: none;
}

.site-nav-backdrop.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.site-nav.site-nav--drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 70vw;
  max-width: 70vw;
  z-index: 800;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  gap: 0;
  padding: 0;
  margin: 0;
  background: var(--color-bg);
  box-shadow: 4px 0 28px rgba(0, 0, 0, 0.14);
  transform: translateX(-100%);
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  visibility: hidden;
  overflow: hidden;
}

.site-nav.site-nav--drawer.is-open {
  transform: translateX(0);
  visibility: visible;
}

.site-nav__drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem var(--space-md);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.site-nav__drawer-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
}

.site-nav__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border: none;
  border-radius: 50%;
  background: #f3f4f6;
  color: var(--color-text);
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
}

.site-nav__drawer-links {
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  flex: 1;
}

@media (max-width: 768px) {
  .header-inner .site-nav:not(.site-nav--drawer) {
    display: none;
  }

  .nav-toggle { display: flex; }

  .site-nav.site-nav--drawer a {
    padding: 0.85rem var(--space-md);
    font-size: 1rem;
    border-bottom: 1px solid var(--color-border);
    white-space: normal;
  }
}

@media (min-width: 769px) {
  .site-nav-backdrop {
    display: none !important;
  }

  .header-inner {
    flex-wrap: wrap;
    align-items: center;
  }

  .site-header:not(.site-header--skin) .site-nav.site-nav--drawer {
    display: flex !important;
    position: static;
    transform: none;
    visibility: visible;
    width: auto;
    max-width: none;
    box-shadow: none;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    padding: 0;
    overflow: visible;
  }

  .site-header:not(.site-header--skin) .site-nav__drawer-head {
    display: none;
  }

  .site-header:not(.site-header--skin) .site-nav__drawer-links {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.35rem 1.25rem;
    overflow: visible;
  }

  .site-header:not(.site-header--skin) .site-nav a {
    padding: 0;
    border: none;
  }

  .site-header:not(.site-header--skin) .nav-toggle {
    display: none;
  }
}

/* Main layout */
.layout {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-md);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 300px);
  gap: var(--space-lg);
  align-items: start;
}

.layout--skin-full {
  max-width: min(1280px, 100%);
  grid-template-columns: 1fr;
  padding: 0;
}

.layout--skin-full .main {
  padding: 0;
}

.main { min-width: 0; }

@media (max-width: 900px) {
  .layout:not(.layout--skin-page):not(.layout--skin-full) {
    grid-template-columns: 1fr;
    padding: var(--space-sm);
  }
  body.has-theme-skin .layout {
    grid-template-columns: 1fr;
    padding: 0;
  }
  .sidebar { order: -1; }
}

body.is-skin-split-home .layout--skin-full {
  max-width: none;
  padding: 0;
}

body.is-skin-split-home .site-footer {
  margin-top: 0;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) var(--space-md);
  text-align: center;
  color: var(--color-muted);
  font-size: 0.875rem;
}

.site-footer p { margin: 0.35rem 0; max-width: 40rem; margin-inline: auto; }

/* Static pages */
/* Non-skin listing & contact pages — align with .layout shell */
body:not(.has-theme-skin) .p100-archive,
body:not(.has-theme-skin) .p100-taxonomy,
body:not(.has-theme-skin) .p100-page--contact {
  width: 100%;
  max-width: none;
  margin: 0;
  padding-left: 0;
  padding-right: 0;
}

body:not(.has-theme-skin) .p100-archive__head,
body:not(.has-theme-skin) .p100-taxonomy__head,
body:not(.has-theme-skin) .p100-contact-page__head {
  max-width: none;
  width: 100%;
}

body:not(.has-theme-skin) .p100-post__head,
body:not(.has-theme-skin) .p100-post__body,
body:not(.has-theme-skin) .p100-post__hero,
body:not(.has-theme-skin) .breadcrumb {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}

body:not(.has-theme-skin) .p100-post > * {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  width: 100%;
  box-sizing: border-box;
}

.p100-page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-sm) var(--space-xl);
}

.p100-page__head { margin-bottom: var(--space-lg); }
.p100-page__head h1 { font-size: clamp(1.75rem, 4vw, 2.25rem); line-height: 1.2; }

.p100-page-form { margin-top: var(--space-lg); }

.p100-form label {
  display: block;
  margin-bottom: var(--space-md);
  font-weight: 600;
}

.p100-form input,
.p100-form textarea,
.p100-form select {
  width: 100%;
  max-width: 100%;
  padding: 0.65rem 0.85rem;
  margin-top: 0.35rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font: inherit;
}

.p100-form button,
.p100-form [type="submit"] {
  padding: 0.7rem 1.5rem;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  cursor: pointer;
}

.p100-checkbox { font-weight: 400; font-size: 0.9rem; }
.p100-checkbox input { width: auto; margin-right: 0.5rem; vertical-align: middle; }

/* List / archive pages */
.list-page {
  max-width: var(--max-width);
}

.list-page h1 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  margin-bottom: var(--space-md);
}

.list-page .post-list li {
  padding: var(--space-md) 0;
}

.list-page .post-list a {
  font-size: 1.15rem;
  font-weight: 600;
  color: inherit;
  text-decoration: none;
}

.list-page .post-list a:hover { color: var(--color-primary); }

.home .tagline { font-size: 1.1rem; color: var(--color-muted); }
.home .lead { max-width: 36rem; }