/* styles.css - شامل للصفحة الرئيسية و lecture1 مع تحسينات */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-dark: #0a0f1c;
  --card-bg: rgba(18, 25, 45, 0.85);
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-glow: rgba(59, 130, 246, 0.5);
  --accent: #60a5fa;
  --text-light: #e2e8f0;
  --text-muted: #cbd5e1; /* تحسين التباين من #94a3b8 إلى #cbd5e1 */
  --border-light: rgba(255, 255, 255, 0.08);
  --success: #10b981;
}

body {
  font-family: "Inter", sans-serif;
  background: var(--bg-dark);
  color: var(--text-light);
  line-height: 1.55;
  overflow-x: hidden;
  font-size: 1.05rem;
}

.bg-grid,
.lecture-grid-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.08) 1px, transparent 1px);
  background-size: 45px 45px;
  pointer-events: none;
  z-index: -2;
}

.container,
.lecture-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* ========== تنسيقات الصفحة الرئيسية (index) ========== */
.course-header {
  text-align: center;
  padding: 3rem 1rem 2rem;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 2rem;
}

.course-badge,
.chapter-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(59, 130, 246, 0.15);
  backdrop-filter: blur(4px);
  border: 1px solid rgba(59, 130, 246, 0.4);
  padding: 6px 22px;
  border-radius: 40px;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  color: var(--primary);
}

.course-header h1 {
  font-size: clamp(2.2rem, 6vw, 3.3rem);
  font-weight: 800;
  background: linear-gradient(135deg, #fff, var(--primary), #93c5fd);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  margin-bottom: 0.75rem;
}

.course-sub,
.hero-sub {
  color: var(--text-muted);
  font-size: 1.2rem;
  max-width: 700px;
  margin: 0 auto;
}

.instructor-panel {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(8px);
  border-radius: 48px;
  padding: 18px 32px;
  margin: 28px auto 20px;
  border: 1px solid var(--border-light);
  max-width: 980px;
}

.instructor-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
}

.instructor-item i {
  color: var(--primary);
  font-size: 1.3rem;
}

.weeks-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin: 2.5rem 0;
}

.week-card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: 32px;
  overflow: hidden;
  transition:
    transform 0.25s ease,
    box-shadow 0.3s;
}

.week-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 25px 40px -18px var(--primary-glow);
}

.week-header-bar {
  background: linear-gradient(
    90deg,
    rgba(59, 130, 246, 0.15) 0%,
    rgba(15, 23, 42, 0.8) 100%
  );
  padding: 1.2rem 1.8rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  border-bottom: 1px solid var(--border-light);
}

.chapter-number {
  background: var(--primary);
  color: white;
  font-weight: 700;
  padding: 0.4rem 1.1rem;
  border-radius: 40px;
  font-size: 0.9rem;
}

.chapter-title-main {
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--accent);
  flex: 1;
}

.lecture-btn {
  background: rgba(59, 130, 246, 0.2);
  border: 1px solid var(--primary);
  color: var(--primary);
  padding: 8px 24px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: inherit;
  text-decoration: none;
}

.lecture-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  transform: scale(0.97);
  text-decoration: none;
}

.week-body {
  padding: 1.8rem;
}

.week-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.4rem;
  flex-wrap: wrap;
  gap: 12px;
}

.chapter-topic {
  background: rgba(59, 130, 246, 0.2);
  padding: 0.3rem 1.2rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.info-box {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 24px;
  padding: 1.2rem;
  border-right: 3px solid var(--primary);
}

.info-box h4 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  margin-bottom: 0.9rem;
  color: var(--accent);
  font-size: 1.1rem;
}

.info-box ul {
  list-style: none;
  padding-right: 0;
}

.info-box li {
  margin-bottom: 0.7rem;
  font-size: 0.92rem;
  line-height: 1.45;
  padding-right: 1.2rem;
  position: relative;
}

.info-box li:before {
  content: "▹";
  position: absolute;
  right: -0.5rem;
  color: var(--primary);
}

.practical-lab {
  margin-top: 1.2rem;
  background: rgba(16, 185, 129, 0.1);
  border-radius: 20px;
  padding: 1rem 1.4rem;
  border: 1px solid rgba(16, 185, 129, 0.3);
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 0.92rem;
  font-weight: 500;
}

.practical-lab i {
  color: var(--success);
  font-size: 1.3rem;
}

.assessment-block {
  background: rgba(18, 25, 45, 0.7);
  backdrop-filter: blur(8px);
  border-radius: 32px;
  padding: 2.2rem;
  margin: 2.2rem 0;
  border: 1px solid var(--border-light);
}

.assess-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px;
  margin-top: 1.8rem;
}

.assess-card {
  background: rgba(0, 0, 0, 0.25);
  padding: 1.4rem 2rem;
  border-radius: 28px;
  flex: 1;
  min-width: 170px;
  text-align: center;
  border-bottom: 2px solid var(--primary);
}

.assess-card h3 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 8px;
}

.assess-card p {
  font-size: 1rem;
  font-weight: 600;
}

.assess-card small {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.textbook-section {
  background: rgba(0, 0, 0, 0.35);
  border-radius: 32px;
  padding: 1.8rem;
  margin: 1.5rem 0 2rem;
}

.textbook-section p,
.textbook-section h3 {
  font-size: 1rem;
}

footer,
.lecture-footer {
  text-align: center;
  padding: 2rem 1rem;
  border-top: 1px solid var(--border-light);
  margin-top: 2.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

h2 {
  font-size: 2rem;
  font-weight: 700;
  margin: 1rem 0 0.2rem;
}

.section-desc {
  color: var(--text-muted);
  margin-bottom: 1rem;
  font-size: 1rem;
}

code {
  background: #1e293b;
  padding: 2px 10px;
  border-radius: 30px;
  font-size: 0.85rem;
}

/* ========== تنسيقات خاصة بصفحة المحاضرة lecture1 ========== */
.lecture-hero {
  text-align: center;
  padding: 2.5rem 1rem 2rem;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 2rem;
}

.lecture-hero h1 {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 800;
  background: linear-gradient(135deg, #fff, var(--primary), #93c5fd);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}

.highlight {
  background: linear-gradient(135deg, var(--primary), #93c5fd);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}

.lecture-meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin: 1.2rem 0 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.quick-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 1.5rem 0 2rem;
}

.quick-nav a {
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid var(--border-light);
  padding: 8px 18px;
  border-radius: 40px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-light);
  text-decoration: none;
  transition: 0.2s;
}

.quick-nav a:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

.lecture-card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: 32px;
  padding: 1.8rem;
  margin-bottom: 2rem;
  transition: transform 0.2s;
}

.lecture-card:hover {
  border-color: var(--primary);
  box-shadow: 0 20px 35px -12px var(--primary-glow);
}

.split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}

.info-panel {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 24px;
  padding: 1.2rem;
  border-left: 3px solid var(--primary);
}

.info-panel h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  margin-bottom: 1rem;
  color: var(--accent);
}

.info-panel ul {
  list-style: none;
  padding-left: 0;
}

.info-panel li {
  margin-bottom: 0.7rem;
  padding-left: 1.2rem;
  position: relative;
}

.info-panel li:before {
  content: "▹";
  position: absolute;
  left: -0.2rem;
  color: var(--primary);
}

.callout-icon {
  margin-top: 1rem;
  padding: 0.8rem;
  background: rgba(59, 130, 246, 0.1);
  border-radius: 20px;
  font-size: 0.9rem;
}

.protocol-compare {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 1rem;
  background: rgba(0, 0, 0, 0.2);
  padding: 1rem;
  border-radius: 28px;
}

.protocol-compare div {
  flex: 1;
  padding: 0.5rem;
  border-right: 1px solid var(--border-light);
}

.protocol-compare div:last-child {
  border-right: none;
}

.access-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.access-item {
  background: rgba(0, 0, 0, 0.25);
  padding: 1rem;
  border-radius: 20px;
  border-bottom: 2px solid var(--primary);
}

.media-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0.8rem 0;
}

.media-list span {
  background: rgba(59, 130, 246, 0.2);
  padding: 5px 15px;
  border-radius: 30px;
  font-size: 0.85rem;
}

.note {
  background: rgba(255, 255, 100, 0.1);
  padding: 0.8rem;
  border-radius: 20px;
  border-left: 4px solid var(--accent);
  margin-top: 0.8rem;
}

.core-flex {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 1rem 0;
}

.core-flex > div {
  flex: 1;
  background: rgba(0, 0, 0, 0.2);
  padding: 1rem;
  border-radius: 24px;
}

.comparison-box {
  background: rgba(59, 130, 246, 0.1);
  padding: 1rem;
  border-radius: 20px;
  margin: 1rem 0;
  border-left: 4px solid var(--primary);
}

.delay-formula {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.8rem;
  background: rgba(0, 0, 0, 0.2);
  padding: 1rem;
  border-radius: 24px;
  margin: 1rem 0;
}

.analogy-card,
.traceroute-demo {
  background: rgba(16, 185, 129, 0.1);
  padding: 1rem;
  border-radius: 20px;
  margin: 1rem 0;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

pre {
  background: #0a0f1c;
  padding: 1rem;
  border-radius: 20px;
  overflow-x: auto;
  font-size: 0.8rem;
  border: 1px solid var(--border-light);
  margin: 1rem 0;
  font-family: "Courier New", monospace;
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.security-grid div {
  background: rgba(0, 0, 0, 0.3);
  padding: 1rem;
  border-radius: 20px;
  border-top: 3px solid var(--primary);
}

.stack-visual {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 28px;
  padding: 1rem;
  margin: 1rem 0;
}

.layer {
  background: rgba(59, 130, 246, 0.2);
  margin: 0.5rem 0;
  padding: 0.8rem 1rem;
  border-radius: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  font-weight: 600;
}

.layer span {
  font-weight: normal;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.encap-demo {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin: 1.5rem 0;
  background: rgba(0, 0, 0, 0.25);
  padding: 1rem;
  border-radius: 32px;
}

.encap-box {
  background: var(--primary-dark);
  padding: 8px 16px;
  border-radius: 40px;
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
}

.encap-box .small {
  font-size: 0.7rem;
  font-weight: normal;
  display: block;
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 1rem 0;
}

.timeline div {
  background: rgba(0, 0, 0, 0.25);
  padding: 0.8rem 1rem;
  border-radius: 20px;
  border-left: 4px solid var(--primary);
}

.callout {
  background: rgba(59, 130, 246, 0.15);
  padding: 1rem;
  border-radius: 24px;
  margin-top: 1rem;
}

.summary-core {
  background: linear-gradient(
    135deg,
    rgba(59, 130, 246, 0.1),
    rgba(15, 23, 42, 0.8)
  );
}

.review-questions {
  background: rgba(0, 0, 0, 0.3);
  padding: 1rem;
  border-radius: 24px;
  margin-top: 1rem;
  line-height: 1.8;
}

/* ========== استجابة للشاشات الصغيرة ========== */
@media (max-width: 780px) {
  .content-grid,
  .split-grid {
    grid-template-columns: 1fr;
  }
  .week-header-bar,
  .core-flex {
    flex-direction: column;
    align-items: flex-start;
  }
  body {
    font-size: 1rem;
  }
  .chapter-title-main {
    font-size: 1.2rem;
  }
  .instructor-panel {
    gap: 18px;
    padding: 16px 20px;
    border-radius: 32px;
  }
  .assess-grid {
    flex-direction: column;
    align-items: stretch;
  }
  .assess-card {
    min-width: auto;
  }
  .container,
  .lecture-container {
    padding: 0 18px;
  }
  .quick-nav {
    gap: 8px;
  }
  .quick-nav a {
    padding: 6px 12px;
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .week-body,
  .lecture-card {
    padding: 1.2rem;
  }
  .info-box,
  .info-panel {
    padding: 1rem;
  }
  .assessment-block {
    padding: 1.5rem;
  }
  .course-header,
  .lecture-hero {
    padding: 2rem 0.5rem 1.5rem;
  }
  .encap-demo {
    flex-direction: column;
  }
  .layer {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

/* إضافة في نهاية الملف - لتحسين المسافات والعناصر القابلة للقراءة */
.lecture-container,
.lecture-container-special {
  padding: 2rem;
}

/* توحيد هوامش القوائم */
.lecture-container-special ul,
.lecture-container-special ol,
.lecture-card ul,
.lecture-card ol {
  margin: 0.75rem 0 0.75rem 1.8rem; /* مسافة من اليسار كافية */
  padding-left: 0;
}

/* عناصر الـ li تحت القوائم */
.lecture-container-special li,
.lecture-card li {
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

/* للعناصر التي تحتوي على border-left (مثل الملاحظات) */
.info-note,
.homework-box,
.callout,
.comparison-box {
  padding: 1rem 1rem 1rem 1.5rem; /* زيادة padding-left */
  margin: 1.2rem 0;
  border-left-width: 4px;
  border-left-style: solid;
}

/* العناوين داخل هذه الصناديق يجب أن تحافظ على محاذاتها */
.info-note h3,
.homework-box h3,
.info-note h4,
.homework-box h4 {
  margin-top: 0;
  margin-bottom: 0.75rem;
}

/* الأعمدة (two-cols) */
.two-cols .col {
  padding: 1.2rem;
}

/* قوائم داخل الأعمدة */
.two-cols .col ul,
.two-cols .col ol {
  margin-left: 1.2rem;
}

/* تحسين عرض البطاقات (access-card) */
.access-card {
  padding: 0.8rem 1rem;
  border-left: 3px solid var(--primary);
  margin-bottom: 0.5rem;
}

/* معالجة القوائم المتداخلة */
ul ul,
ol ol,
ul ol,
ol ul {
  margin-top: 0.25rem;
  margin-bottom: 0.25rem;
}