/*
Theme Name: Zen Theme
Theme URI: https://example.com/zen-theme
Author: Antigravity AI
Author URI: https://example.com
Description: Minimalist Zen/Wabi-Sabi WordPress theme with Ivory background and Jade Green accents.
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: zen-theme
Tags: minimal, wabi-sabi, zen, beige, green, clean
*/

/* ═══════════════════════════════════════════
   CSS Custom Properties (Design Tokens)
   ═══════════════════════════════════════════ */
:root {
  /* Colors - Light Mode */
  --ink: #334155; /* Slate 700 - Softer, elegant dark text */
  --ink-light: #64748B; /* Slate 500 - Airy light text */
  --paper: #FFFFFF; /* Pure White - Maximum spaciousness */
  --paper-muted: #F8FAFC; /* Slate 50 - Very subtle cool off-white */
  --accent: #10B981; /* Emerald 500 - Brighter, energetic jade */
  --accent-dark: #059669; /* Emerald 600 */
  --border: #E2E8F0; /* Slate 200 - Clean, crisp border */

  /* Typography */
  --font-heading: 'Noto Serif', serif;
  --font-body: 'Inter', system-ui, sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

[data-theme="dark"] {
  /* Colors - Dark Mode */
  --ink: #EAE6D9;
  --ink-light: #A4C3B2;
  --paper: #2D3A3A;
  --paper-muted: #242E2E;
  --accent: #86BBA7;
  --accent-dark: #A4C3B2;
  --border: #3D4F4F;
}

/* ═══════════════════════════════════════════
   Base Styles
   ═══════════════════════════════════════════ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background-color: var(--paper);
  line-height: 1.7;
  font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
}

/* Focus Visible - Accessibility */
*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

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

.screen-reader-text:focus {
  position: static;
  width: auto;
  height: auto;
  padding: 0.5rem;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

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

.post-thumbnail {
  aspect-ratio: 16/9;
  object-fit: cover;
  width: 100%;
}

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

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

/* ═══════════════════════════════════════════
   Typography
   ═══════════════════════════════════════════ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  margin-top: 0;
  margin-bottom: var(--spacing-md);
  color: var(--ink);
}

h1 {
  font-size: clamp(2rem, 1.8rem + 1vw, 3rem);
}

h2 {
  font-size: clamp(1.75rem, 1.5rem + 1.25vw, 2.25rem);
}

h3 {
  font-size: clamp(1.5rem, 1.25rem + 1.25vw, 1.875rem);
}

h4 {
  font-size: clamp(1.25rem, 1rem + 1.25vw, 1.5rem);
}

p {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

/* ═══════════════════════════════════════════
   Layout
   ═══════════════════════════════════════════ */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

.site {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-main {
  flex: 1;
}

/* ═══════════════════════════════════════════
   Header
   ═══════════════════════════════════════════ */
.site-header {
  background-color: var(--paper);
  border-bottom: 1px solid transparent;
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header.scrolled {
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.06);
  border-bottom-color: var(--border);
}

[data-theme="dark"] .site-header.scrolled {
  background-color: rgba(45, 58, 58, 0.85);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.875rem 2rem;
}

.site-branding {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.site-logo {
  max-height: 40px;
  width: auto;
}

.site-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0;
  color: var(--ink);
}

.site-title a {
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.site-logo-icon {
  width: 28px;
  height: 28px;
  object-fit: contain;
  flex-shrink: 0;
  opacity: 0.85;
  transition: opacity 0.3s ease;
}

.site-title a:hover .site-logo-icon {
  opacity: 1;
}

/* Navigation */
.main-navigation {
  display: flex;
  align-items: center;
}

.main-navigation ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: var(--spacing-lg);
}

.main-navigation a {
  color: var(--ink);
  font-weight: 500;
  transition: color 0.2s ease;
}

.main-navigation a:hover,
.main-navigation a:focus {
  color: var(--accent);
}

.main-navigation .current-menu-item > a {
  color: var(--accent);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--spacing-sm);
  cursor: pointer;
  color: var(--ink);
}

.menu-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.menu-toggle[aria-expanded="true"] .hamburger::before {
  transform: rotate(45deg);
  top: 0;
}

.menu-toggle[aria-expanded="true"] .hamburger::after {
  transform: rotate(-45deg);
  bottom: 0;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--ink);
  position: relative;
  transition: background-color 0.3s ease;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: var(--ink);
  transition: transform 0.3s ease;
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  bottom: -8px;
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .main-navigation ul {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background-color: var(--paper);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .main-navigation ul.is-open {
    max-height: 500px;
  }

  .main-navigation li {
    width: 100%;
  }

  .main-navigation a {
    display: block;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border);
  }
}

/* ═══════════════════════════════════════════
   Hero Section
   ═══════════════════════════════════════════ */
.hero-section {
  padding: var(--spacing-2xl) 0;
  background-color: var(--paper-muted);
  text-align: center;
}

.hero-section__title {
  font-size: clamp(2.5rem, 2rem + 2.5vw, 4rem);
  margin-bottom: var(--spacing-md);
  color: var(--ink);
}

.hero-section__description {
  font-size: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
  color: var(--ink-light);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* ═══════════════════════════════════════════
   Post Card
   ═══════════════════════════════════════════ */
.post-card {
  display: flex;
  flex-direction: column;
  background-color: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.post-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.post-card__thumbnail {
  aspect-ratio: 16/9;
  overflow: hidden;
}

.post-card__thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.post-card:hover .post-card__thumbnail img {
  transform: scale(1.05);
}

.post-card__content {
  padding: var(--spacing-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.post-card__meta {
  font-size: 0.875rem;
  color: var(--ink-light);
  margin-bottom: var(--spacing-sm);
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.post-card__meta a {
  color: var(--accent);
}

.post-card__title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.post-card__title a {
  color: var(--ink);
}

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

.post-card__excerpt {
  color: var(--ink-light);
  margin-bottom: var(--spacing-md);
  flex: 1;
}

.post-card__read-more {
  color: var(--accent);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.post-card__read-more:hover {
  color: var(--accent-dark);
}

/* Post Grid */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

/* ═══════════════════════════════════════════
   Single Post
   ═══════════════════════════════════════════ */
.single-post {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-md) var(--spacing-xl);
}

.single-post__header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  padding-top: var(--spacing-lg);
}

.single-post__title {
  font-size: clamp(2rem, 1.8rem + 1vw, 3rem);
  margin-bottom: var(--spacing-md);
  line-height: 1.25;
}

.single-post__meta {
  color: var(--ink-light);
  font-size: 0.875rem;
  letter-spacing: 0.02em;
}

.single-post__featured-image {
  margin: var(--spacing-xl) 0;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.single-post__content {
  font-size: 1.125rem;
  line-height: 1.8;
}

.single-post__content h2,
.single-post__content h3 {
  margin-top: var(--spacing-xl);
}

.single-post__content img {
  border-radius: var(--radius-md);
  margin: var(--spacing-lg) 0;
}

/* ═══════════════════════════════════════════
   Pagination
   ═══════════════════════════════════════════ */
.pagination {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin: var(--spacing-xl) 0;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--spacing-sm);
  background-color: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--ink);
  transition: all 0.2s ease;
}

.pagination a:hover,
.pagination .current {
  background-color: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* ═══════════════════════════════════════════
   Footer
   ═══════════════════════════════════════════ */
.site-footer {
  background-color: var(--paper-muted);
  border-top: 1px solid var(--border);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-widgets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.footer-widget {
  padding: var(--spacing-md);
  background-color: var(--paper);
  border-radius: var(--radius-md);
}

.footer-widget h3 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-md);
}

.footer-widget ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-widget li {
  margin-bottom: var(--spacing-sm);
}

.footer-widget a {
  color: var(--ink-light);
}

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

.site-footer__bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border);
  color: var(--ink-light);
  font-size: 0.875rem;
}

/* Back to Top */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 48px;
  height: 48px;
  background-color: var(--accent);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--accent-dark);
  transform: translateY(-2px);
}

/* ═══════════════════════════════════════════
   Comments
   ═══════════════════════════════════════════ */
.comments-area {
  max-width: 800px;
  margin: var(--spacing-xl) auto;
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--border);
}

.comments-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-lg);
}

.comment-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.comment {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border);
}

.comment-body {
  display: flex;
  gap: var(--spacing-md);
}

.comment-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
}

.comment-content {
  flex: 1;
}

.comment-meta {
  font-size: 0.875rem;
  color: var(--ink-light);
  margin-bottom: var(--spacing-sm);
}

.comment-author {
  font-weight: 500;
  color: var(--ink);
}

/* Comment Form */
.comment-respond {
  margin-top: var(--spacing-xl);
}

.comment-form {
  display: grid;
  gap: var(--spacing-md);
}

.comment-form input,
.comment-form textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 1rem;
  background-color: var(--paper);
  color: var(--ink);
  transition: border-color 0.2s ease;
}

.comment-form input:focus,
.comment-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.comment-form textarea {
  min-height: 150px;
  resize: vertical;
}

.comment-form .submit {
  background-color: var(--accent);
  color: white;
  border: none;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 500;
  transition: background-color 0.2s ease;
}

.comment-form .submit:hover {
  background-color: var(--accent-dark);
}

/* ═══════════════════════════════════════════
   404 & Search
   ═══════════════════════════════════════════ */
.error-404,
.search-no-results {
  text-align: center;
  padding: var(--spacing-2xl) 0;
}

.error-404__title,
.search-no-results__title {
  font-size: clamp(3rem, 2.5rem + 2.5vw, 5rem);
  margin-bottom: var(--spacing-md);
  color: var(--accent);
}

.error-404__text,
.search-no-results__text {
  font-size: 1.25rem;
  color: var(--ink-light);
  margin-bottom: var(--spacing-lg);
}

.search-form {
  max-width: 500px;
  margin: var(--spacing-lg) auto;
  display: flex;
  gap: var(--spacing-sm);
}

.search-form input {
  flex: 1;
  padding: var(--spacing-sm);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 1rem;
}

.search-form button {
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 500;
  transition: background-color 0.2s ease;
}

.search-form button:hover {
  background-color: var(--accent-dark);
}

/* ═══════════════════════════════════════════
   Dark Mode Toggle
   ═══════════════════════════════════════════ */
.dark-mode-toggle {
  background: none;
  border: none;
  padding: var(--spacing-sm);
  cursor: pointer;
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s ease;
}

.dark-mode-toggle:hover {
  color: var(--accent);
}

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

/* ═══════════════════════════════════════════
   Responsive
   ═══════════════════════════════════════════ */
@media (max-width: 640px) {
  .posts-grid {
    grid-template-columns: 1fr;
  }

  .footer-widgets {
    grid-template-columns: 1fr;
  }

  .single-post {
    padding: 0 var(--spacing-sm);
  }
}