/* =========================================================
   Single Pages - صفحات العرض الفردية (الدروس/الفروض/الامتحانات)
   تصميم احترافي ومتناسق مع SEO وأزرار تحميل أنيقة
   ========================================================= */

/* ===== Variables ===== */
:root {
  --single-accent: var(--accent, #2c7be5);
  --single-bg: #ffffff;
  --single-border: #e5e7eb;
  --single-text: #0f172a;
  --single-muted: #6b7280;
  --single-shadow: 0 6px 18px rgba(0,0,0,.06);
  --single-shadow-hover: 0 12px 30px rgba(0,0,0,.12);
}

/* ===== Container ===== */
.mx-single-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(16px, 3vw, 24px);
  box-sizing: border-box;
}

@media (max-width: 768px) {
  .mx-single-container {
    padding: 16px 12px;
  }
}

@media (max-width: 480px) {
  .mx-single-container {
    padding: 12px 10px;
  }
}

/* ===== Header ===== */
.mx-single-header {
  margin-bottom: clamp(20px, 3vw, 32px);
  padding-bottom: clamp(16px, 2.5vw, 24px);
  border-bottom: 2px solid var(--single-border);
}

.mx-single-title {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 900;
  line-height: 1.3;
  color: var(--single-text);
  margin: 0 0 clamp(12px, 2vw, 16px);
}

.mx-single-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: clamp(12px, 2vw, 16px);
}

.mx-single-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: #f3f4f6;
  border: 1px solid var(--single-border);
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--single-text);
  text-decoration: none;
  transition: all 0.2s;
}

.mx-single-chip:hover {
  background: var(--single-accent);
  color: #fff;
  border-color: var(--single-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,.1);
}

.mx-single-chip--primary {
  background: color-mix(in oklab, var(--single-accent) 12%, #fff);
  border-color: color-mix(in oklab, var(--single-accent) 30%, #e5e7eb);
  color: var(--single-accent);
}

.mx-single-chip--primary:hover {
  background: var(--single-accent);
  color: #fff;
}

.mx-single-date {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: #f9fafb;
  border: 1px solid var(--single-border);
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--single-muted);
}

.mx-single-date::before {
  content: "📅";
  font-size: 1rem;
}

/* ===== Content ===== */
.mx-single-content {
  background: var(--single-bg);
  border: 1px solid var(--single-border);
  border-radius: 16px;
  padding: clamp(20px, 3vw, 32px);
  margin-bottom: clamp(20px, 3vw, 32px);
  box-shadow: var(--single-shadow);
  line-height: 1.9;
  color: var(--single-text);
}

@media (max-width: 768px) {
  .mx-single-content {
    padding: 20px 16px;
    border-radius: 14px;
  }
}

@media (max-width: 480px) {
  .mx-single-content {
    padding: 16px 12px;
    border-radius: 12px;
  }
}

.mx-single-content p {
  margin-bottom: 1.2rem;
}

.mx-single-content h2,
.mx-single-content h3,
.mx-single-content h4 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-weight: 800;
  color: var(--single-text);
  line-height: 1.4;
}

.mx-single-content h2 {
  font-size: clamp(20px, 3vw, 28px);
}

.mx-single-content h3 {
  font-size: clamp(18px, 2.5vw, 24px);
}

.mx-single-content h4 {
  font-size: clamp(16px, 2vw, 20px);
}

.mx-single-content ul,
.mx-single-content ol {
  margin: 0 0 1.2rem 1.5rem;
  padding: 0;
}

.mx-single-content li {
  margin-bottom: 0.6rem;
}

.mx-single-content img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  margin: 1.5rem 0;
}

.mx-single-content a {
  color: var(--single-accent);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.mx-single-content a:hover {
  text-decoration: none;
  background: color-mix(in oklab, var(--single-accent) 10%, #fff);
  padding: 2px 4px;
  border-radius: 4px;
}

/* ===== Files Section ===== */
.mx-single-files {
  background: var(--single-bg);
  border: 1px solid var(--single-border);
  border-radius: 16px;
  padding: clamp(20px, 3vw, 32px);
  margin-bottom: clamp(20px, 3vw, 32px);
  box-shadow: var(--single-shadow);
}

.mx-single-files__title {
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 900;
  color: var(--single-text);
  margin: 0 0 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.mx-single-files__title::before {
  content: "📁";
  font-size: 1.5rem;
}

.mx-single-files__desc {
  color: var(--single-muted);
  font-size: 0.95rem;
  margin: 0 0 clamp(16px, 2.5vw, 24px);
  line-height: 1.6;
}

.mx-single-files__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
}

@media (max-width: 640px) {
  .mx-single-files__grid {
    grid-template-columns: 1fr;
  }
}

.mx-single-file {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  background: #f9fafb;
  border: 2px solid var(--single-border);
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.2s;
  box-sizing: border-box;
}

.mx-single-file:hover {
  background: var(--single-accent);
  border-color: var(--single-accent);
  transform: translateY(-3px);
  box-shadow: var(--single-shadow-hover);
}

.mx-single-file:hover .mx-single-file__icon,
.mx-single-file:hover .mx-single-file__name,
.mx-single-file:hover .mx-single-file__type {
  color: #fff;
}

.mx-single-file__icon {
  font-size: 2rem;
  flex-shrink: 0;
  transition: transform 0.2s;
}

.mx-single-file:hover .mx-single-file__icon {
  transform: scale(1.1);
}

.mx-single-file__content {
  flex: 1;
  min-width: 0;
}

.mx-single-file__name {
  display: block;
  font-weight: 800;
  font-size: 1rem;
  color: var(--single-text);
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mx-single-file__type {
  display: block;
  font-size: 0.85rem;
  color: var(--single-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.mx-single-file__arrow {
  font-size: 1.5rem;
  color: var(--single-muted);
  flex-shrink: 0;
  transition: transform 0.2s;
}

.mx-single-file:hover .mx-single-file__arrow {
  transform: translateX(4px);
  color: #fff;
}

html[dir="rtl"] .mx-single-file:hover .mx-single-file__arrow {
  transform: translateX(-4px);
}

/* File Type Icons */
.mx-single-file--pdf .mx-single-file__icon::before { content: "📄"; }
.mx-single-file--video .mx-single-file__icon::before { content: "🎥"; }
.mx-single-file--image .mx-single-file__icon::before { content: "🖼️"; }
.mx-single-file--doc .mx-single-file__icon::before { content: "📝"; }
.mx-single-file--link .mx-single-file__icon::before { content: "🔗"; }

/* ===== SEO Section ===== */
.mx-single-seo {
  background: linear-gradient(135deg, #f9fafb 0%, #ffffff 100%);
  border: 1px solid var(--single-border);
  border-radius: 16px;
  padding: clamp(20px, 3vw, 32px);
  margin-bottom: clamp(20px, 3vw, 32px);
  box-shadow: var(--single-shadow);
}

.mx-single-seo__title {
  font-size: clamp(18px, 2.5vw, 24px);
  font-weight: 900;
  color: var(--single-text);
  margin: 0 0 clamp(12px, 2vw, 16px);
}

.mx-single-seo__content {
  color: var(--single-text);
  line-height: 1.9;
  font-size: 1rem;
}

.mx-single-seo__content p {
  margin-bottom: 1rem;
}

.mx-single-seo__content strong {
  color: var(--single-accent);
  font-weight: 800;
}

/* ===== Related Links ===== */
.mx-single-related {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.mx-single-related__title {
  font-size: clamp(18px, 2.5vw, 24px);
  font-weight: 900;
  color: var(--single-text);
  margin: 0 0 clamp(12px, 2vw, 16px);
  display: flex;
  align-items: center;
  gap: 10px;
}

.mx-single-related__title::before {
  content: "🔗";
  font-size: 1.5rem;
}

.mx-single-related__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 12px;
}

@media (max-width: 640px) {
  .mx-single-related__grid {
    grid-template-columns: 1fr;
  }
}

.mx-single-related__item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: #fff;
  border: 2px solid var(--single-border);
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.2s;
}

.mx-single-related__item:hover {
  background: var(--single-accent);
  border-color: var(--single-accent);
  transform: translateY(-2px);
  box-shadow: var(--single-shadow-hover);
}

.mx-single-related__item:hover .mx-single-related__text,
.mx-single-related__item:hover .mx-single-related__arrow {
  color: #fff;
}

.mx-single-related__text {
  flex: 1;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--single-text);
}

.mx-single-related__arrow {
  font-size: 1.2rem;
  color: var(--single-muted);
  transition: transform 0.2s;
}

.mx-single-related__item:hover .mx-single-related__arrow {
  transform: translateX(4px);
}

html[dir="rtl"] .mx-single-related__item:hover .mx-single-related__arrow {
  transform: translateX(-4px);
}

/* ===== Navigation ===== */
.mx-single-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

@media (max-width: 640px) {
  .mx-single-nav {
    grid-template-columns: 1fr;
  }
}

.mx-single-nav__item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  background: #fff;
  border: 2px solid var(--single-border);
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.2s;
  box-sizing: border-box;
}

.mx-single-nav__item:hover {
  background: var(--single-accent);
  border-color: var(--single-accent);
  transform: translateY(-2px);
  box-shadow: var(--single-shadow-hover);
}

.mx-single-nav__item:hover .mx-single-nav__text,
.mx-single-nav__item:hover .mx-single-nav__arrow {
  color: #fff;
}

.mx-single-nav__item--prev {
  text-align: right;
}

html[dir="ltr"] .mx-single-nav__item--prev {
  text-align: left;
}

.mx-single-nav__item--next {
  text-align: left;
  flex-direction: row-reverse;
}

html[dir="ltr"] .mx-single-nav__item--next {
  text-align: right;
  flex-direction: row;
}

.mx-single-nav__arrow {
  font-size: 1.5rem;
  color: var(--single-muted);
  flex-shrink: 0;
  transition: transform 0.2s;
}

.mx-single-nav__item:hover .mx-single-nav__arrow {
  transform: translateX(-4px);
}

.mx-single-nav__item--next:hover .mx-single-nav__arrow {
  transform: translateX(4px);
}

html[dir="rtl"] .mx-single-nav__item:hover .mx-single-nav__arrow {
  transform: translateX(4px);
}

html[dir="rtl"] .mx-single-nav__item--next:hover .mx-single-nav__arrow {
  transform: translateX(-4px);
}

.mx-single-nav__content {
  flex: 1;
  min-width: 0;
}

.mx-single-nav__label {
  display: block;
  font-size: 0.85rem;
  color: var(--single-muted);
  font-weight: 600;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.mx-single-nav__title {
  display: block;
  font-weight: 800;
  font-size: 1rem;
  color: var(--single-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mx-single-nav__item--disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ===== Back Button ===== */
.mx-single-back {
  text-align: center;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.mx-single-back__btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  background: #fff;
  border: 2px solid var(--single-accent);
  border-radius: 12px;
  color: var(--single-accent);
  font-weight: 800;
  font-size: 1rem;
  text-decoration: none;
  transition: all 0.2s;
  box-shadow: 0 4px 12px rgba(0,0,0,.05);
}

.mx-single-back__btn:hover {
  background: var(--single-accent);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--single-shadow-hover);
}

.mx-single-back__icon {
  font-size: 1.2rem;
}

/* ===== Empty States ===== */
.mx-single-empty {
  text-align: center;
  padding: clamp(40px, 6vw, 60px) 20px;
  color: var(--single-muted);
}

.mx-single-empty__icon {
  font-size: 4rem;
  margin-bottom: 16px;
}

.mx-single-empty__text {
  font-size: 1.1rem;
  font-weight: 600;
}

/* ===== Responsive Adjustments ===== */
@media (max-width: 768px) {
  .mx-single-title {
    font-size: clamp(22px, 5vw, 28px);
  }
  
  .mx-single-meta {
    gap: 8px;
  }
  
  .mx-single-chip,
  .mx-single-date {
    padding: 6px 12px;
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .mx-single-title {
    font-size: 20px;
  }
  
  .mx-single-chip,
  .mx-single-date {
    padding: 6px 10px;
    font-size: 0.8rem;
  }
  
  .mx-single-file,
  .mx-single-related__item,
  .mx-single-nav__item {
    padding: 12px 14px;
  }
}