:root {
  --font-main: 'Outfit', sans-serif;
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --accent-color: #0284c7;
  --success-color: #10b981;
  --border-color: #e2e8f0;
  --placeholder-bg: rgba(79, 70, 229, 0.05);
  --placeholder-border: rgba(79, 70, 229, 0.25);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.06);
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Wireframe Visual Placeholder */
.wireframe-image-placeholder {
  width: 100%;
  height: 100%;
  min-height: 180px;
  background: var(--placeholder-bg);
  border: 2px dashed var(--placeholder-border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  padding: 1.5rem;
  text-align: center;
}

.wireframe-image-placeholder i {
  font-size: 2.5rem;
  opacity: 0.95;
}

/* Buttons & Pills */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: 30px;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.25s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: #fff;
  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

.btn-outline {
  border-color: var(--border-color);
  color: var(--text-main);
  background: #ffffff;
}

.btn-outline:hover {
  background: #f1f5f9;
  border-color: var(--primary-color);
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1rem;
}

.pill-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary-color);
  border: 1px solid rgba(79, 70, 229, 0.25);
  padding: 0.35rem 1rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
}

/* Header Navbar */
.header {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 1.1rem 0;
  box-shadow: 0 2px 10px rgba(0,0,0,0.03);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--text-main);
}

.brand-icon {
  color: var(--primary-color);
  font-size: 1.6rem;
}

.nav {
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

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

.nav-actions {
  display: flex;
  gap: 0.75rem;
}

/* Hero Section */
.hero-section {
  padding: 4.5rem 0;
  background: radial-gradient(circle at 80% 20%, rgba(79, 70, 229, 0.08) 0%, transparent 60%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.25rem;
  color: var(--text-main);
}

.hero-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-placeholder {
  min-height: 320px;
  box-shadow: var(--shadow);
}

/* Courses Section */
.courses-section {
  padding: 4rem 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 2.5rem;
}

.section-title {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--text-main);
}

.section-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 0.35rem;
}

.view-all-link {
  font-weight: 700;
  color: var(--primary-color);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.95rem;
}

.view-all-link:hover {
  text-decoration: underline;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 15px rgba(0,0,0,0.03);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.course-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary-color);
  box-shadow: 0 12px 25px rgba(79, 70, 229, 0.12);
}

.course-thumb {
  position: relative;
  height: 160px;
}

.course-badge {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: var(--primary-color);
  color: #fff;
  font-weight: 800;
  font-size: 0.7rem;
  padding: 0.2rem 0.6rem;
  border-radius: 12px;
}

.course-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.course-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.3;
  color: var(--text-main);
}

.course-snippet {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
}

.course-meta {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  font-weight: 600;
}

.star {
  color: #f59e0b;
}

.price {
  color: var(--primary-color);
  font-weight: 800;
  font-size: 1rem;
}

/* Middle Banner */
.middle-banner {
  padding: 4rem 0;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.08), rgba(2, 132, 199, 0.08));
}

.text-center {
  text-align: center;
}

.banner-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--text-main);
}

.banner-text {
  max-width: 750px;
  margin: 0 auto;
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* Student Dashboard Section */
.dashboard-section {
  padding: 4.5rem 0;
}

.mb-4 {
  margin-bottom: 2.5rem;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.dashboard-item-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
  transition: border-color 0.25s ease;
}

.dashboard-item-card:hover {
  border-color: var(--primary-color);
}

.dash-icon {
  width: 50px;
  height: 50px;
  background: rgba(79, 70, 229, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  font-size: 1.4rem;
  margin-bottom: 1.25rem;
}

.dash-item-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.dash-item-text {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.progress-bar-wrap {
  width: 100%;
  height: 8px;
  background: #e2e8f0;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-bar {
  height: 100%;
  background: var(--primary-color);
  border-radius: 4px;
}

.progress-bar.accent {
  background: var(--accent-color);
}

.progress-bar.green {
  background: var(--success-color);
}

.progress-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
}

/* Bottom Section */
.bottom-section {
  padding: 4.5rem 0;
  background: #ffffff;
  border-top: 1px solid var(--border-color);
}

.bottom-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: center;
}

.bottom-placeholder {
  min-height: 280px;
}

.bottom-title {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1rem;
  color: var(--text-main);
}

.bottom-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

/* Footer */
.footer {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-brand {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 1024px) {
  .courses-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-grid, .bottom-grid {
    grid-template-columns: 1fr;
  }
  .courses-grid {
    grid-template-columns: 1fr;
  }
  .nav {
    display: none;
  }
  .hero-title {
    font-size: 2.2rem;
  }
}

/* Global Mobile Viewport Overflow Protection */
html, body {
  overflow-x: hidden;
  max-width: 100%;
}
img, svg, video, iframe, canvas {
  max-width: 100%;
  height: auto;
}