/*
Theme Name: Keep Blog Lite
Theme URI: https://example.com/keep-blog-lite
Author: Your Name
Author URI: https://example.com
Description: An ultra-lightweight, zero-bloat WordPress theme inspired by the Google Blog's card-based Material Design aesthetic. No frameworks, no jQuery, no third-party SEO plugin required. Built for 100/100 Core Web Vitals.
Version: 1.1.0
Requires at least: 6.5
Tested up to: 7.0
Requires PHP: 8.0
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: keep-blog-lite
Tags: blog, grid-layout, custom-logo, featured-images, translation-ready
*/

/* =========================================================
   1. CSS RESET / BASE
   Minimal reset -- we avoid a full "normalize.css" import
   to keep the request count and byte size as low as possible.
   ========================================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  /* System font stack first (zero network cost). Google Sans / Roboto
     are loaded locally & progressively enhance if present. */
  font-family: "Google Sans", Roboto, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Helvetica, Arial, sans-serif;
  color: #202124; /* Google's near-black text color */
  background-color: #ffffff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

ul,
ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

button {
  font: inherit;
  cursor: pointer;
}

/* =========================================================
   2. CSS VARIABLES (Design Tokens)
   ========================================================= */
:root {
  --color-bg: #ffffff;
  --color-surface: #f8f9fa; /* Google grey-50 */
  --color-border: #e8eaed; /* Google grey-200 */
  --color-text: #202124;
  --color-text-secondary: #5f6368; /* Google grey-700 */
  --color-accent-blue: #1a73e8; /* Google blue-600 */
  --color-accent-blue-hover: #174ea6;
  --radius-card: 12px;
  --radius-pill: 999px;
  --max-width: 1180px;
  --nav-height: 64px;
  --transition-fast: 150ms ease;
}

/* =========================================================
   3. LAYOUT CONTAINER
   ========================================================= */
.wrap {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 24px;
}

/* =========================================================
   4. STICKY NAVIGATION BAR
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.site-branding {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.2px;
}

.site-branding img {
  height: 28px;
  width: auto;
}

.primary-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.primary-menu .menu-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.primary-menu a {
  display: inline-block;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.primary-menu a:hover,
.primary-menu a:focus-visible {
  background-color: var(--color-surface);
  color: var(--color-text);
}

/* Mobile nav toggle (pure CSS + tiny vanilla JS, no libraries) */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  padding: 8px;
}

.menu-toggle svg {
  width: 24px;
  height: 24px;
}

@media (max-width: 780px) {
  .menu-toggle {
    display: inline-flex;
  }

  .primary-menu {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 24px 16px;
    display: none;
  }

  .primary-menu.is-open {
    display: flex;
  }

  .primary-menu .menu-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .primary-menu a {
    padding: 12px 8px;
    border-radius: 8px;
  }
}

/* =========================================================
   5. HERO / PAGE HEADING
   ========================================================= */
.page-heading {
  padding: 48px 0 32px;
}

.page-heading h1 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 500;
  letter-spacing: -1px;
  margin: 0 0 8px;
}

.page-heading p {
  color: var(--color-text-secondary);
  font-size: 18px;
  margin: 0;
}

/* Category / tag / author / search pages: extra breathing room */
.archive-header {
  padding: 72px 0 48px;
}

.archive-description {
  color: var(--color-text-secondary);
  font-size: 18px;
  max-width: 720px;
}

.archive-description p {
  margin: 0;
}

.archive-empty {
  padding-bottom: 64px;
  color: var(--color-text-secondary);
}

@media (max-width: 780px) {
  .archive-header {
    padding: 48px 0 32px;
  }
}

/* =========================================================
   6. CARD GRID (Homepage / Archive)
   ========================================================= */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 32px;
  padding-bottom: 64px;
}

.post-card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.post-card:hover {
  box-shadow: 0 1px 2px rgba(60, 64, 67, 0.08), 0 4px 16px rgba(60, 64, 67, 0.12);
  transform: translateY(-2px);
}

.card-media {
  aspect-ratio: 16 / 10;
  background-color: var(--color-surface);
  overflow: hidden;
}

.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-body {
  padding: 20px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.card-eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--color-accent-blue);
}

.card-title {
  font-size: 20px;
  font-weight: 500;
  line-height: 1.3;
  margin: 0;
}

.card-excerpt {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  margin-top: auto;
  padding-top: 8px;
  font-size: 13px;
  color: var(--color-text-secondary);
  display: flex;
  gap: 8px;
  align-items: center;
}

/* =========================================================
   7. PAGINATION
   ========================================================= */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding-bottom: 64px;
}

.pagination .nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  border: 1px solid var(--color-border);
}

.pagination .current {
  background: var(--color-accent-blue);
  border-color: var(--color-accent-blue);
  color: #fff;
}

.pagination a:hover {
  background: var(--color-surface);
}

/* =========================================================
   8. SINGLE POST -- distraction-free article layout
   ========================================================= */
.article-header {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 24px;
  text-align: left;
}

.article-header .card-eyebrow {
  margin-bottom: 12px;
}

.article-header h1 {
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.5px;
  margin: 0 0 16px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text-secondary);
  font-size: 14px;
}

.article-meta .author-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
}

.article-featured-media {
  max-width: 1000px;
  margin: 0 auto 40px;
  padding: 0 24px;
}

.article-featured-media img {
  border-radius: var(--radius-card);
}

.article-content {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px 64px;
  font-size: 18px;
  line-height: 1.75;
  color: var(--color-text);
}

.article-content h2 {
  font-size: 28px;
  font-weight: 500;
  margin: 40px 0 16px;
  letter-spacing: -0.3px;
}

.article-content h3 {
  font-size: 22px;
  font-weight: 500;
  margin: 32px 0 12px;
}

.article-content p {
  margin: 0 0 24px;
}

.article-content img {
  border-radius: var(--radius-card);
  margin: 24px 0;
}

.article-content a {
  color: var(--color-accent-blue);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.article-content blockquote {
  margin: 32px 0;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--color-accent-blue);
  color: var(--color-text-secondary);
  font-style: italic;
}

.article-content ul,
.article-content ol {
  margin: 0 0 24px;
  padding-left: 24px;
  list-style: revert;
}

.page-links {
  margin: 0 0 24px;
  font-size: 15px;
}

.article-footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px 64px;
  border-top: 1px solid var(--color-border);
  padding-top: 32px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-list a {
  font-size: 13px;
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-text-secondary);
}

.tag-list a:hover {
  background: var(--color-surface);
}

/* =========================================================
   9. FOOTER
   ========================================================= */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
  margin-top: 32px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.footer-menu-list {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

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

/* =========================================================
   10. ACCESSIBILITY / UTILITY
   ========================================================= */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: #fff;
  color: var(--color-text);
  padding: 12px 20px;
  z-index: 200;
  border-radius: 0 0 8px 0;
}

.skip-link:focus {
  left: 0;
}

.screen-reader-text {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
  white-space: nowrap;
}

/* Respect users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}