/* assets/css/styles.css */

/* 
 * GreenTechMag - Premium Static Site Theme
 * ----------------------------------------
 * 1. CSS Variables (Theming & Systems)
 * 2. Reset & Base
 * 3. Typography
 * 4. Layout & Grid
 * 5. Utilities
 * 6. Components
 */

/* 1. CSS Variables */
:root {
  /* Three Color Palette */
  --color-primary: #00994d;
  --color-white: #ffffff;
  --color-black: #000000;
  
  /* System Assignments */
  --color-bg-body: var(--color-white);
  --color-text-main: var(--color-black);
  --color-text-muted: #666666;
  --color-bg-card: var(--color-white);
  --color-border: #e0e0e0;
  --color-tag-bg: var(--color-black);
  --color-tag-text: var(--color-white);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 5rem;

  /* Typography */
  --font-family-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-family-serif: "Merriweather", Georgia, serif;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 3rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
}

/* Dark Theme Overrides */
[data-theme="dark"] {
  --color-bg-body: var(--color-black);
  --color-text-main: var(--color-white);
  --color-text-muted: #bbbbbb;
  --color-bg-card: #111111;
  --color-border: #333333;
  --color-tag-bg: var(--color-white);
  --color-tag-text: var(--color-black);
}

/* 2. Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family-sans);
  background-color: var(--color-bg-body);
  color: var(--color-text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

ul, ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* 3. Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-serif);
  line-height: 1.2;
  margin-bottom: var(--spacing-xs);
  font-weight: 700;
  transition: color var(--transition-fast);
}

h1:hover, h2:hover, h3:hover {
    color: var(--color-primary);
}
h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p {
  margin-bottom: var(--spacing-sm);
}

/* Breadcrumbs */
.breadcrumb {
  padding: var(--spacing-md) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
  margin: 0;
}

.breadcrumb li {
  display: flex;
  align-items: center;
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin: 0 var(--spacing-xs);
  color: var(--color-border);
  font-size: 0.8em;
}

.breadcrumb a {
  color: var(--color-text-muted);
}

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

.breadcrumb [aria-current="page"] {
  color: var(--color-text-main);
  font-weight: 600;
}

/* 4. Layout & Grid */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2-col {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid-2-col {
    grid-template-columns: 2fr 1fr; /* Content 2/3, Sidebar 1/3 */
  }
}

/* 5. Utilities */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.focus\:not-sr-only:focus {
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* 5. Components (Header, Footer, Cards - Base) */
/* Detailed component styles will be added as we build them */

/* 5. Components (Header, Footer, Cards - Base) */

/* --- Header --- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  background-color: var(--color-bg-body);
  z-index: 1000;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

[data-theme="dark"] .site-header {
  background-color: var(--color-black);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3rem; /* Fixed height for consistency */
}

.site-logo {
  font-family: var(--font-family-serif);
  font-weight: 700;
  font-size: var(--font-size-xl);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  text-decoration: none;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.site-logo:hover {
    color: var(--color-primary);
    transform: scale(1.02);
}

.logo-text {
  color: var(--color-text-main);
}

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

/* Navigation */
.site-nav {
  display: none; /* Hidden on mobile by default */
}

@media (min-width: 768px) {
  .site-nav {
    display: block;
  }
}

.nav-list {
  display: flex;
  gap: var(--spacing-md);
}

.nav-link {
  font-weight: 500;
  font-size: var(--font-size-sm);
  color: var(--color-text-main);
  position: relative;
  padding: var(--spacing-xs) 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-fast);
}

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

.nav-link:hover::after {
  width: 100%;
}

/* Nav Link Underline Effect */
.nav-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: 0;
  left: 0;
  background-color: var(--color-primary);
  transition: width var(--transition-fast);
}

.nav-link:hover::after {
  width: 100%;
}

/* Theme & Mobile Toggle */
.theme-toggle,
.mobile-menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  color: var(--color-text-main);
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background-color: var(--color-secondary);
  color: var(--color-primary);
}

.subcategory-nav-bottom {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.subcategory-nav-bottom .section-header {
    margin-bottom: 1.5rem;
}

.subcategory-links {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.subcategory-pill {
    background: var(--color-tag-bg);
    border: 1px solid var(--color-black);
    color: var(--color-tag-text);
    font-weight: 700;
    font-size: 0.85rem;
    padding: 0.5rem 1.2rem;
    transition: all 0.2s ease;
    border-radius: var(--radius-full);
}

[data-theme="dark"] .subcategory-pill {
    border-color: var(--color-white);
}

.subcategory-pill:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

/* Subscription Feedback */
.subscribe-message {
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
    text-align: center;
    font-weight: 500;
}

.success-message {
    background-color: rgba(0, 153, 77, 0.1);
    color: var(--color-primary);
    border: 1px solid rgba(0, 153, 77, 0.2);
}

.error-message {
    background-color: rgba(230, 57, 70, 0.1);
    color: #e63946;
    border: 1px solid rgba(230, 57, 70, 0.2);
}

/* Theme Toggle Specific Styling */
/* Light Mode (Moon Icon) -> Dark circle */
[data-theme="light"] .theme-toggle {
  background-color: var(--color-text-main); /* Dark/Black */
  color: var(--color-bg-body); /* White/Light */
}

/* Dark Mode (Sun Icon) -> White circle */
[data-theme="dark"] .theme-toggle {
  background-color: #ffffff; /* Explicit White */
  color: #000000; /* Explicit Black/Dark for icon contrast */
}

.theme-toggle:hover {
  transform: scale(1.1);
}

.mobile-menu-toggle {
  display: flex;
}

@media (min-width: 768px) {
  .mobile-menu-toggle {
    display: none;
  }
}

/* --- Mobile Menu Overlay --- */
/* When .is-open is added to .site-nav via JS */
@media (max-width: 767px) {
  .site-nav {
    position: fixed;
    top: 60px; /* Header height approx */
    left: 0;
    right: 0;
    background-color: var(--color-bg-body);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
  }

  .site-nav.is-open {
    display: block;
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
  }

  .nav-link {
    font-size: var(--font-size-lg);
  }
}

/* --- Cards (Base) --- */
.card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  border: 1px solid transparent; /* Anti-aliasing fix */
}

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

.card-image-link {
  display: block;
  overflow: hidden;
  aspect-ratio: 16/9;
}

.card-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.card:hover .card-image {
  transform: scale(1.05);
}

.card-content {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.category-pill {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: var(--color-primary);
  color: white;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--spacing-xs);
  transition: all var(--transition-fast);
}

.category-pill:hover {
    background-color: var(--color-black);
    color: var(--color-white);
    transform: translateY(-1px);
}

[data-theme="dark"] .category-pill:hover {
    background-color: var(--color-white);
    color: var(--color-black);
}

.card-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
}

.card-title a {
  color: var(--color-text-main);
  background-image: linear-gradient(var(--color-text-main), var(--color-text-main));
  background-size: 0% 1px;
  background-repeat: no-repeat;
  background-position: 0 100%;
  transition: background-size var(--transition-fast);
}

.card-title a:hover {
  color: var(--color-text-main);
  background-size: 100% 1px;
}

.card-meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

.card-excerpt {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  flex-grow: 1; /* Push footer down if we had one */
}

/* Featured Card Override */
.card-featured {
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.card-featured .card-title {
  font-size: var(--font-size-2xl);
}

@media (min-width: 768px) {
  .card-featured {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    align-items: stretch;
  }
  
  .card-featured .card-image-link {
    aspect-ratio: auto;
    height: 100%;
  }

  .card-featured .card-content {
    padding: var(--spacing-lg);
    justify-content: center;
  }
}

/* Post Cards List */
.post-feed {
  display: grid;
  gap: var(--spacing-lg);
}

.card-post {
  display: grid;
  gap: var(--spacing-md);
  /* Mobile: Stacked */
}

@media (min-width: 600px) {
  .card-post {
    grid-template-columns: 1fr 1.5fr; /* Horizontal on wider screens */
    align-items: center;
    background: transparent;
  }
  
  .card-post:hover {
    transform: none; /* Disable lift on list items if desired, or keep it */
    transform: translateX(4px);
  }

  .card-post .card-image-link {
    border-radius: var(--radius-md);
    aspect-ratio: 4/3;
  }
  
  .card-post .card-content {
    padding: var(--spacing-xs) 0;
  }
}

/* --- Sidebar Widgets --- */
.widget {
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-md);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.widget-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-xs);
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

/* Categories Widget */
.widget-list li {
  border-bottom: 1px solid var(--color-border);
}
.widget-list li:last-child {
  border-bottom: none;
}

.widget-list a {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-xs) 0;
  color: var(--color-text-muted);
  font-weight: 500;
}

.widget-list a:hover {
  color: var(--color-primary);
  transform: translateX(4px);
  display: flex; /* keep flex */
}

/* Search Widget */
.search-form {
  display: flex;
  gap: var(--spacing-xs);
}

.form-input {
  width: 100%;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  background-color: var(--color-bg-body);
  color: var(--color-text-main);
}

.form-input:focus {
  outline: 2px solid var(--color-primary);
  border-color: transparent;
}

/* Buttons */
.btn-primary {
  background-color: var(--color-primary);
  color: white;
  border: 1px solid var(--color-primary);
}

.btn-primary:hover {
  filter: brightness(1.1);
}

.btn-outline {
  border: 1px solid var(--color-border);
  background: transparent; /* No var */
  color: var(--color-text-main);
}

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

.btn-block {
  display: flex;
  width: 100%;
  margin-top: var(--spacing-xs);
}

/* Video Widget */
.video-wrapper {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--spacing-xs);
}

.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 3rem;
  height: 3rem;
  background-color: rgba(0,0,0,0.7);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: transform var(--transition-fast);
}

.video-wrapper:hover .play-button {
  transform: translate(-50%, -50%) scale(1.1);
  background-color: var(--color-primary);
}

.video-caption {
  font-size: var(--font-size-sm);
  font-weight: 500;
}

/* Pagination */
.pagination-wrapper {
  margin-top: var(--spacing-xl);
  text-align: center;
}
/* --- Article Layout --- */
.article-header {
  margin-bottom: var(--spacing-lg);
  text-align: center;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.article-title {
  font-size: 2.5rem;
  margin-top: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

@media (min-width: 768px) {
  .article-title {
    font-size: 3.5rem;
  }
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.meta-author-avatar img {
  border-radius: 50%;
  width: 40px;
  height: 40px;
  object-fit: cover;
}

.meta-info {
  text-align: left;
}

.meta-byline a {
  font-weight: 700;
  color: var(--color-text-main);
}

.meta-separator {
  margin: 0 var(--spacing-xs);
}

.article-hero {
  margin-bottom: var(--spacing-xl);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.article-hero img {
  width: 100%;
  height: auto;
}

.article-hero figcaption {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-align: center;
  margin-top: var(--spacing-xs);
  font-style: italic;
}

/* Article Body Typography */
.article-body {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--color-text-main);
  max-width: 740px; /* Optimal reading width */
  margin: 0 auto;
}

.article-body p {
  margin-bottom: var(--spacing-lg);
}

.article-body .lead {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-text-main);
}

.article-body h2 {
  font-size: 2rem;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
}

.article-body h3 {
  font-size: 1.5rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

.article-body blockquote {
  border-left: 4px solid var(--color-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  background-color: var(--color-bg-card);
  font-size: 1.25rem;
  font-style: italic;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.article-body blockquote cite {
  display: block;
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-sm);
  font-style: normal;
  color: var(--color-text-muted);
}

.article-body ul, 
.article-body ol {
  margin-bottom: var(--spacing-lg);
  padding-left: var(--spacing-xl);
}

.article-body li {
  margin-bottom: var(--spacing-xs);
  list-style-type: disc; /* explicitly set */
}

/* Article Footer */
.article-footer {
  max-width: 740px;
  margin: var(--spacing-xl) auto 0;
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-lg);
}

.article-tags {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

.tag {
  background-color: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
  display: inline-block;
}

.tag:hover {
  background-color: var(--color-primary);
  color: white;
  transform: scale(1.05);
}

/* Author Bio */
.author-bio {
  display: flex;
  gap: var(--spacing-md);
  background-color: var(--color-bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.author-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.author-info h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xs);
}

.author-info p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

.author-link {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-primary);
}

/* Comments */
.comments-section {
  max-width: 740px;
  margin: var(--spacing-xl) auto;
  text-align: center;
  padding: var(--spacing-xl) 0;
  border-top: 1px dashed var(--color-border);
}

/* --- Footer --- */
.site-footer {
  background-color: var(--color-bg-body);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xxl) 0 var(--spacing-xl);
  margin-top: var(--spacing-xxl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-sm);
  max-width: 300px;
}

.footer-links h4,
.footer-social h4 {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-main);
}

.footer-links ul li {
  margin-bottom: var(--spacing-xs);
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border); /* Slightly darker line */
  padding-top: var(--spacing-md);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
}

[data-theme="dark"] .site-footer {
  background-color: var(--color-bg-card); /* Distinct separate area */
}