@import url('variables.css');

/**
 * Academy Theme - Main Stylesheet
 * Handcrafted with Pure CSS, Modern Flexbox & Grid, Full RTL Support
 */

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

html {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  direction: rtl;
  text-align: right;
  scroll-behavior: smooth;
  background-color: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.35;
  margin-bottom: var(--space-3);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

@media (min-width: 1024px) {
  h1 { font-size: var(--text-5xl); }
  h2 { font-size: var(--text-4xl); }
  h3 { font-size: var(--text-3xl); }
}

p {
  margin-bottom: var(--space-4);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

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

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

ul, ol {
  list-style-position: inside;
  margin-bottom: var(--space-4);
}

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

.skip-link:focus {
  position: fixed !important;
  top: 15px !important;
  right: 15px !important;
  z-index: 10000 !important;
  width: auto !important;
  height: auto !important;
  clip: auto !important;
  background: var(--color-accent) !important;
  color: var(--color-accent-contrast) !important;
  padding: 10px 20px !important;
  border-radius: var(--radius-md) !important;
  font-weight: bold !important;
  box-shadow: var(--shadow-xl) !important;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* ==========================================================================
   2. Layout Containers & Grid System
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.site-main {
  flex: 1 0 auto;
}

.section-py {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

@media (min-width: 768px) {
  .section-py {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-10);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.section-title {
  position: relative;
  display: inline-block;
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-2);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 50%;
  transform: translateX(50%);
  width: 60px;
  height: 3px;
  background-color: var(--color-accent);
  border-radius: var(--radius-full);
}

.section-subtitle {
  color: var(--color-muted);
  font-size: var(--text-lg);
}

/* ==========================================================================
   3. Buttons & Badges
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.65rem 1.4rem;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.4;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-primary-contrast);
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: var(--color-primary-contrast);
  transform: translateY(-1px);
}

.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-accent-contrast);
  border-color: var(--color-accent);
}

.btn-accent:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: var(--color-accent-contrast);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

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

.btn-sm {
  padding: 0.4rem 0.9rem;
  font-size: var(--text-sm);
}

.btn-lg {
  padding: 0.85rem 1.8rem;
  font-size: var(--text-lg);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.65rem;
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  background-color: var(--color-badge-bg);
  color: var(--color-badge-text);
  border: 1px solid var(--color-border);
}

.badge-accent {
  background-color: rgba(201, 162, 39, 0.12);
  color: var(--color-accent);
  border-color: rgba(201, 162, 39, 0.25);
}

/* ==========================================================================
   4. Header & Navigation (Sticky, Responsive, Dropdowns)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.site-branding {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.site-branding img, .site-branding svg {
  max-height: 52px;
  width: auto;
}

.site-title-text {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

/* Nav Menu Desktop */
.primary-navigation {
  display: none;
}

@media (min-width: 1024px) {
  .primary-navigation {
    display: block;
  }
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  color: var(--color-text);
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover, .nav-item:focus-within > .nav-link {
  color: var(--color-primary);
  background-color: var(--color-surface-hover);
}

/* Dropdown Menu (Level 2) */
.sub-menu {
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 240px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  list-style: none;
  padding: var(--space-2);
  margin: 0;
  margin-top: 6px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 200ms ease, visibility 200ms ease, transform 200ms ease;
  transition-delay: 180ms; /* Grace period on mouse leave: keeps menu alive while cursor moves */
  z-index: 1010;
  pointer-events: none;
}

/* Invisible bridge: covers the gap between nav-item and sub-menu so hover never drops */
.sub-menu::before {
  content: '';
  position: absolute;
  top: -14px;
  left: 0;
  right: 0;
  height: 14px;
  background: transparent;
}

.nav-item:hover > .sub-menu,
.nav-item:focus-within > .sub-menu,
.nav-item.is-open > .sub-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition-delay: 0s; /* Opens instantly on hover/focus */
  pointer-events: auto;
}

.sub-menu .nav-link {
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
}

.sub-menu .nav-link:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-primary);
}

/* Header Utilities (Search, Dark Mode Toggle, Mobile Button) */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  background-color: var(--color-surface-hover);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background-color: var(--color-border);
  color: var(--color-primary);
  transform: translateY(-1px);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}

.theme-toggle-btn .sun-icon {
  display: none;
}
.theme-toggle-btn .moon-icon {
  display: block;
}

[data-theme="dark"] .theme-toggle-btn .sun-icon {
  display: block;
}
[data-theme="dark"] .theme-toggle-btn .moon-icon {
  display: none;
}

.mobile-menu-btn {
  display: inline-flex;
}

@media (min-width: 1024px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* Mobile Drawer */
.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: -100%;
  width: 85%;
  max-width: 360px;
  height: 100vh;
  background-color: var(--color-surface);
  border-left: 1px solid var(--color-border);
  box-shadow: var(--shadow-xl);
  z-index: 2000;
  padding: var(--space-6);
  overflow-y: auto;
  transition: right var(--transition-normal);
  display: block;
}

.mobile-nav-drawer.is-open {
  right: 0 !important;
  display: block !important;
}

.mobile-drawer-overlay {
  position: fixed;
  inset: 0;
  background-color: var(--color-overlay);
  z-index: 1999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  pointer-events: none;
}

.mobile-drawer-overlay.is-open {
  opacity: 1 !important;
  visibility: visible !important;
  pointer-events: auto;
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

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

.mobile-nav-item {
  border-bottom: 1px solid var(--color-border-subtle);
}

.mobile-nav-item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.mobile-nav-link {
  flex: 1;
  display: block;
  padding: var(--space-3) 0;
  color: var(--color-text);
  font-weight: 600;
  font-size: var(--text-base);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.mobile-submenu-toggle {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-surface-hover);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.mobile-submenu-toggle:hover {
  background-color: var(--color-border);
  color: var(--color-primary);
}

.mobile-caret-icon {
  transition: transform var(--transition-fast);
}

.mobile-nav-item.is-expanded > .mobile-nav-item-row .mobile-caret-icon {
  transform: rotate(180deg);
}

.mobile-submenu {
  list-style: none;
  padding: 0;
  margin: var(--space-1) 0 var(--space-3) 0;
  padding-right: var(--space-4);
  border-right: 2px solid var(--color-accent);
  display: none;
}

.mobile-nav-item.is-expanded > .mobile-submenu {
  display: block !important;
}

.mobile-submenu-link {
  display: block;
  padding: var(--space-2) 0;
  color: var(--color-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Search Modal Overlay */
.search-modal {
  position: fixed;
  inset: 0;
  z-index: 2100;
  background-color: var(--color-overlay);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 100px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.search-modal.is-open {
  opacity: 1;
  visibility: visible;
}

.search-modal-content {
  background-color: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  width: 90%;
  max-width: 650px;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
  position: relative;
}

.search-form-inner {
  display: flex;
  gap: var(--space-2);
}

.search-input {
  flex: 1;
  padding: 0.8rem 1.2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: inherit;
  font-size: var(--text-base);
}

.search-modal-close {
  position: absolute;
  top: -15px;
  left: -15px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ==========================================================================
   5. Hero Section (Front Page)
   ========================================================================== */
.hero-section {
  position: relative;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-16) 0;
  overflow: hidden;
}

.hero-pattern-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/islamic-pattern.svg');
  background-repeat: repeat;
  opacity: 0.8;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

.hero-badge {
  margin-bottom: var(--space-4);
}

.hero-title {
  font-size: var(--text-4xl);
  line-height: 1.25;
  margin-bottom: var(--space-5);
  color: var(--color-text);
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 3.25rem;
  }
}

.hero-description {
  font-size: var(--text-lg);
  color: var(--color-muted);
  line-height: 1.8;
  margin-bottom: var(--space-8);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}

/* ==========================================================================
   6. Scientific Fields Grid (5 Cards)
   ========================================================================== */
.fields-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .fields-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .fields-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

.field-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-4);
  text-align: center;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.field-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.field-icon-wrap {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-lg);
  background: var(--color-badge-bg);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  transition: all var(--transition-fast);
}

.field-card:hover .field-icon-wrap {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
}

.field-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.field-count {
  font-size: var(--text-xs);
  color: var(--color-muted);
}

/* ==========================================================================
   7. Cards & Grid System (Studies, Journal, Resources, Events, Videos)
   ========================================================================== */
.cards-grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .cards-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .cards-grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Card: Study */
.card-study {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

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

.card-study-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-muted);
}

.card-study-title {
  font-size: var(--text-xl);
  line-height: 1.4;
  margin-bottom: var(--space-3);
}

.card-study-title a {
  color: var(--color-text);
}

.card-study-title a:hover {
  color: var(--color-primary);
}

.card-study-author {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.card-study-abstract {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: 1.7;
  flex-grow: 1;
  margin-bottom: var(--space-4);
}

.card-study-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border-subtle);
}

/* Card: Journal Issue Featured */
.journal-featured-box {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: center;
}

@media (min-width: 900px) {
  .journal-featured-box {
    grid-template-columns: 340px 1fr;
  }
}

.journal-cover-wrap {
  text-align: center;
}

.journal-cover-img {
  max-width: 280px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
}

.journal-meta-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.journal-title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-3);
}

.journal-excerpt {
  color: var(--color-muted);
  font-size: var(--text-base);
  line-height: 1.8;
  margin-bottom: var(--space-6);
}

.journal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* Tabs: Digital Library */
.library-tabs-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
  margin-bottom: var(--space-8);
  list-style: none;
  padding: 0;
}

.library-tab-btn {
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text);
  font-family: inherit;
  font-weight: 600;
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.library-tab-btn[aria-selected="true"] {
  background-color: var(--color-primary);
  color: var(--color-primary-contrast);
  border-color: var(--color-primary);
}

.library-tab-panel {
  display: none;
}

.library-tab-panel.is-active {
  display: block;
}

/* Card: Resource */
.card-resource {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.card-resource:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.resource-format-badge {
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--color-badge-bg);
  color: var(--color-primary);
}

/* Card: Event */
.event-featured-card {
  background: linear-gradient(135deg, var(--color-primary) 0%, #10233b 100%);
  color: #FFFFFF;
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  margin-bottom: var(--space-8);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: center;
}

@media (min-width: 768px) {
  .event-featured-card {
    grid-template-columns: 220px 1fr;
  }
}

.event-date-large {
  text-align: center;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-4);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.event-date-day {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1;
  font-family: var(--font-heading);
  color: var(--color-accent);
}

.event-date-month {
  font-size: var(--text-lg);
  font-weight: 600;
}

.event-date-year {
  font-size: var(--text-sm);
  opacity: 0.8;
}

.event-content-title {
  color: #FFFFFF;
  font-size: var(--text-2xl);
  margin-bottom: var(--space-3);
}

.event-meta-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  font-size: var(--text-sm);
  opacity: 0.9;
}

.event-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Card: Video (Facade Player) */
.card-video {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.video-facade-container {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 ratio */
  background-color: #000000;
  cursor: pointer;
  overflow: hidden;
}

.video-facade-container img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.video-facade-container:hover img {
  transform: scale(1.05);
}

.video-play-btn {
  position: absolute;
  top: 50%;
  right: 50%;
  transform: translate(50%, -50%);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: rgba(31, 58, 95, 0.9);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
  transition: all var(--transition-fast);
  border: 2px solid var(--color-accent);
}

.video-facade-container:hover .video-play-btn {
  background-color: var(--color-accent);
  color: var(--color-accent-contrast);
  transform: translate(50%, -50%) scale(1.1);
}

.card-video-content {
  padding: var(--space-4);
  flex-grow: 1;
}

.card-video-title {
  font-size: var(--text-base);
  line-height: 1.4;
  margin-bottom: var(--space-2);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-4);
  background-color: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-xl);
  color: var(--color-muted);
}

.empty-state-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-3);
  color: var(--color-muted);
  opacity: 0.6;
}

/* ==========================================================================
   8. Single Post / Page Styles
   ========================================================================== */
.entry-header {
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.entry-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  color: var(--color-muted);
  font-size: var(--text-sm);
  margin-top: var(--space-3);
}

.abstract-highlight-box {
  background-color: var(--color-surface-hover);
  border-right: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
}

.abstract-highlight-title {
  font-size: var(--text-lg);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.keywords-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.pdf-download-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5) var(--space-6);
  margin-bottom: var(--space-8);
  box-shadow: var(--shadow-sm);
}

.citation-box {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-top: var(--space-10);
}

.citation-code {
  background: var(--color-bg);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  font-family: monospace;
  font-size: var(--text-xs);
  display: block;
  overflow-x: auto;
  direction: ltr;
  text-align: left;
}

/* ==========================================================================
   9. Forms & Form Alerts
   ========================================================================== */
.form-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: 600;
  color: var(--color-text);
  font-size: var(--text-sm);
}

.form-label .required {
  color: var(--color-error);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: inherit;
  font-size: var(--text-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(31, 58, 95, 0.15);
  outline: none;
}

.form-file-dropzone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  text-align: center;
  background-color: var(--color-bg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.form-file-dropzone:hover {
  border-color: var(--color-accent);
}

.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.alert-success {
  background-color: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid var(--color-success);
}

.alert-error {
  background-color: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

/* ==========================================================================
   10. Pagination & Breadcrumbs
   ========================================================================== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-12);
}

.page-numbers {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.page-numbers:hover, .page-numbers.current {
  background-color: var(--color-primary);
  color: var(--color-primary-contrast);
  border-color: var(--color-primary);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-muted);
  margin-bottom: var(--space-6);
}

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

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

/* ==========================================================================
   11. Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-16);
  color: var(--color-text);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  }
}

.footer-widget-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
  color: var(--color-primary);
  position: relative;
  padding-bottom: var(--space-2);
}

.footer-widget-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 35px;
  height: 2px;
  background-color: var(--color-accent);
}

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

.footer-links li {
  margin-bottom: var(--space-2);
}

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

.footer-links a:hover {
  color: var(--color-accent);
  padding-right: 4px;
}

.social-links-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.social-icon-link {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background-color: var(--color-surface-hover);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.social-icon-link:hover {
  background-color: var(--color-primary);
  color: var(--color-primary-contrast);
  transform: translateY(-2px);
}

.footer-bottom-bar {
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

/* ==========================================================================
   12. Reduced Motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}