/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: #1a1a2e; background: #fafbfc; line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

/* ===== Buttons ===== */
.btn {
  display: inline-block; padding: 10px 22px; border-radius: 8px;
  font-weight: 600; font-size: 0.95rem; transition: all .2s;
  cursor: pointer; border: 2px solid transparent;
}
.btn-primary { background: #4f46e5; color: #fff; }
.btn-primary:hover { background: #4338ca; }
.btn-outline { border-color: #4f46e5; color: #4f46e5; }
.btn-outline:hover { background: #4f46e5; color: #fff; }
.btn-lg { padding: 14px 30px; font-size: 1.05rem; }

/* ===== Navbar ===== */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid #e5e7eb;
}
.nav-content {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo {
  font-size: 1.4rem; font-weight: 800; letter-spacing: -0.5px;
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  font-size: 0.92rem; font-weight: 500; color: #555;
  transition: color .2s; position: relative;
}
.nav-links a:hover, .nav-links a.active { color: #4f46e5; }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 2px; background: #4f46e5; border-radius: 2px;
}
.mobile-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; }

/* ===== Hero ===== */
.hero {
  padding: 80px 0 60px;
  background: linear-gradient(160deg, #eef2ff 0%, #fafbfc 50%, #f0fdf4 100%);
}
.hero-inner { display: flex; align-items: center; gap: 60px; }
.hero-text { flex: 1; }
.hero h1 {
  font-size: 3.2rem; font-weight: 800; line-height: 1.15;
  letter-spacing: -1px; margin-bottom: 18px;
}
.hero p { font-size: 1.15rem; color: #555; max-width: 500px; margin-bottom: 28px; }
.hero-cta { display: flex; gap: 14px; }

/* Code Card */
.hero-visual { flex: 1; display: flex; justify-content: center; }
.code-card {
  background: #1e1e2e; border-radius: 14px;
  width: 100%; max-width: 420px; box-shadow: 0 20px 60px rgba(0,0,0,.15);
  overflow: hidden;
}
.code-header { display: flex; gap: 7px; padding: 14px 18px; background: #2a2a3e; }
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }
.code-card pre {
  padding: 20px 22px 24px; font-size: 0.88rem; line-height: 1.7;
  font-family: 'SF Mono', 'Fira Code', monospace; color: #cdd6f4; overflow-x: auto;
}
.code-card .kw { color: #cba6f7; }
.code-card .fn { color: #89b4fa; }
.code-card .param { color: #fab387; }
.code-card .str { color: #a6e3a1; }
.code-card .comment { color: #6c7086; }

/* ===== Section Titles ===== */
.section-title {
  text-align: center; font-size: 2rem; font-weight: 800;
  letter-spacing: -0.5px; margin-bottom: 8px;
}
.section-sub { text-align: center; color: #777; font-size: 1.05rem; margin-bottom: 48px; }

/* ===== Features ===== */
.features { padding: 80px 0; }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.feature-card {
  background: #fff; border: 1px solid #e5e7eb; border-radius: 14px;
  padding: 32px 28px; transition: transform .2s, box-shadow .2s;
}
.feature-card:hover {
  transform: translateY(-4px); box-shadow: 0 12px 32px rgba(79,70,229,.08);
}
.feature-icon { font-size: 2rem; margin-bottom: 14px; }
.feature-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { color: #666; font-size: 0.92rem; }

/* ===== Courses Preview ===== */
.courses-preview { padding: 80px 0; background: #fff; }
.courses-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.course-card {
  display: block; border: 1px solid #e5e7eb; border-radius: 14px; overflow: hidden;
  transition: transform .2s, box-shadow .2s; background: #fff; color: inherit;
}
.course-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,.08); }
.course-thumb {
  height: 160px; display: flex; align-items: center; justify-content: center; position: relative;
}
.course-tag {
  position: absolute; top: 12px; left: 12px;
  background: rgba(255,255,255,.2); backdrop-filter: blur(6px);
  color: #fff; padding: 4px 12px; border-radius: 6px; font-size: 0.78rem; font-weight: 600;
}
.thumb-icon { font-size: 3rem; }
.course-body { padding: 22px; }
.course-body h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.course-body p { color: #666; font-size: 0.88rem; margin-bottom: 14px; }
.course-meta { display: flex; gap: 14px; font-size: 0.8rem; color: #999; }
.center-cta { text-align: center; margin-top: 40px; }

/* ===== Footer ===== */
.footer { padding: 40px 0 0; background: #1a1a2e; color: #ccc; }
.footer-grid-simple {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 20px;
}
.footer-brand .logo { margin-bottom: 4px; }
.footer-brand p { font-size: 0.85rem; color: #999; }
.footer-nav { display: flex; gap: 24px; }
.footer-nav a { color: #999; font-size: 0.88rem; transition: color .2s; }
.footer-nav a:hover { color: #a5b4fc; }
.footer-bottom {
  border-top: 1px solid #2a2a3e; padding: 20px 0;
  font-size: 0.82rem; color: #666; text-align: center;
}

/* ===== Page Header ===== */
.page-header {
  padding: 48px 0 32px;
  background: linear-gradient(160deg, #eef2ff 0%, #fafbfc 100%);
  text-align: center;
}
.page-header h1 { font-size: 2.4rem; font-weight: 800; margin-bottom: 8px; }
.page-header p { color: #666; font-size: 1.05rem; }
.page-content { padding: 48px 0 80px; }

/* Filters */
.filters { display: flex; gap: 10px; justify-content: center; margin-bottom: 40px; flex-wrap: wrap; }
.filter-btn {
  padding: 8px 20px; border-radius: 20px; border: 1px solid #e5e7eb;
  background: #fff; font-size: 0.88rem; font-weight: 500; cursor: pointer; transition: all .2s;
}
.filter-btn:hover, .filter-btn.active { background: #4f46e5; color: #fff; border-color: #4f46e5; }

/* Tutorial cards */
.tutorial-card {
  background: #fff; border: 1px solid #e5e7eb; border-radius: 14px;
  padding: 28px; transition: transform .2s, box-shadow .2s;
}
.tutorial-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,.06); }
.tutorial-card .tag {
  display: inline-block; padding: 4px 10px; border-radius: 6px;
  font-size: 0.75rem; font-weight: 600; margin-bottom: 12px;
}
.tag-html { background: #fef3c7; color: #92400e; }
.tag-css { background: #dbeafe; color: #1e40af; }
.tag-js { background: #fef9c3; color: #854d0e; }
.tag-python { background: #d1fae5; color: #065f46; }
.tag-react { background: #ede9fe; color: #5b21b6; }
.tag-node { background: #dcfce7; color: #166534; }
.tutorial-card h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.tutorial-card p { color: #666; font-size: 0.9rem; margin-bottom: 12px; }
.tutorial-meta { font-size: 0.8rem; color: #999; }

/* Project cards */
.project-card {
  background: #fff; border: 1px solid #e5e7eb; border-radius: 14px;
  overflow: hidden; transition: transform .2s, box-shadow .2s;
}
.project-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,.08); }
.project-banner {
  height: 140px; display: flex; align-items: center; justify-content: center; font-size: 3rem;
}
.project-card .project-body { padding: 22px; }
.project-card h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
.project-card .difficulty {
  display: inline-block; padding: 3px 10px; border-radius: 6px;
  font-size: 0.72rem; font-weight: 600; margin-bottom: 10px;
}
.diff-beginner { background: #d1fae5; color: #065f46; }
.diff-intermediate { background: #fef3c7; color: #92400e; }
.diff-advanced { background: #fee2e2; color: #991b1b; }
.project-card p { color: #666; font-size: 0.88rem; margin-bottom: 12px; }
.tech-stack { display: flex; gap: 6px; flex-wrap: wrap; }
.tech-stack span {
  padding: 3px 10px; background: #f3f4f6; border-radius: 6px; font-size: 0.75rem; color: #555;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero-inner { flex-direction: column; text-align: center; }
  .hero p { margin: 0 auto 28px; }
  .hero-cta { justify-content: center; }
  .features-grid, .courses-grid { grid-template-columns: 1fr; }
  .footer-grid-simple { flex-direction: column; gap: 16px; text-align: center; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .mobile-toggle { display: block; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; padding: 20px 24px; gap: 16px;
    border-bottom: 1px solid #e5e7eb; box-shadow: 0 8px 24px rgba(0,0,0,.08);
  }
  .hero h1 { font-size: 2.2rem; }
}

/* ===== Course Detail Page ===== */
.course-hero { padding: 48px 0 56px; }
.course-hero-inner { display: flex; align-items: center; gap: 48px; }
.course-hero-text { flex: 1; }
.back-link {
  display: inline-block; font-size: 0.88rem; color: #666;
  margin-bottom: 16px; transition: color .2s;
}
.back-link:hover { color: #4f46e5; }
.course-type-badge {
  display: inline-block; padding: 4px 14px; border-radius: 6px;
  background: #4f46e5; color: #fff; font-size: 0.78rem; font-weight: 600;
  margin-bottom: 14px;
}
.course-hero h1 { font-size: 2.4rem; font-weight: 800; line-height: 1.2; margin-bottom: 14px; }
.course-hero p { font-size: 1.05rem; color: #555; max-width: 560px; margin-bottom: 20px; line-height: 1.7; }
.course-info-row { display: flex; gap: 20px; font-size: 0.9rem; color: #666; }
.course-hero-icon {
  flex-shrink: 0; width: 180px; height: 180px; border-radius: 24px;
  display: flex; align-items: center; justify-content: center;
  font-size: 5rem; background: rgba(255,255,255,.6); backdrop-filter: blur(8px);
  border: 1px solid rgba(0,0,0,.06);
}

/* Sections */
.course-section { padding: 48px 0; }
.course-section.alt-bg { background: #f8f9fb; }
.course-section h2 { font-size: 1.5rem; font-weight: 800; margin-bottom: 24px; }

/* Learn list */
.learn-list {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 32px;
}
.learn-list li {
  padding-left: 28px; position: relative; font-size: 0.95rem; color: #444; line-height: 1.6;
}
.learn-list li::before {
  content: '✓'; position: absolute; left: 0; color: #4f46e5; font-weight: 700;
}

/* Curriculum accordion */
.curriculum-module {
  border: 1px solid #e5e7eb; border-radius: 10px; margin-bottom: 10px;
  overflow: hidden; background: #fff;
}
.module-header {
  display: flex; align-items: center; gap: 14px; padding: 16px 20px;
  cursor: pointer; transition: background .2s; user-select: none;
}
.module-header:hover { background: #f8f9fb; }
.module-num { font-size: 0.82rem; font-weight: 700; color: #4f46e5; min-width: 28px; }
.module-title { flex: 1; font-weight: 600; font-size: 0.95rem; }
.module-count { font-size: 0.8rem; color: #999; }
.module-arrow { font-size: 0.85rem; color: #999; transition: transform .2s; }
.curriculum-module.open .module-arrow { transform: rotate(90deg); }
.module-items {
  max-height: 0; overflow: hidden; transition: max-height .3s ease;
  padding: 0 20px;
}
.curriculum-module.open .module-items {
  max-height: 500px; padding: 0 20px 16px;
}
.module-items li {
  padding: 8px 0 8px 28px; position: relative; font-size: 0.9rem; color: #555;
  border-top: 1px solid #f0f0f0;
}
.module-items li::before {
  content: '▹'; position: absolute; left: 8px; color: #bbb;
}

/* Prerequisites */
.prereq-list li {
  padding: 8px 0 8px 28px; position: relative; font-size: 0.95rem; color: #444;
}
.prereq-list li::before {
  content: '•'; position: absolute; left: 8px; color: #4f46e5; font-weight: 700;
}

@media (max-width: 900px) {
  .course-hero-inner { flex-direction: column; text-align: center; }
  .course-hero p { margin: 0 auto 20px; }
  .course-info-row { justify-content: center; }
  .learn-list { grid-template-columns: 1fr; }
  .course-hero-icon { width: 120px; height: 120px; font-size: 3.5rem; }
}

/* ===== WordPress Lesson List ===== */
.wp-note { color: #888; font-size: 0.95rem; }
.wp-lessons { display: flex; flex-direction: column; gap: 10px; }
.wp-lesson-card {
  display: flex; align-items: center; gap: 18px;
  padding: 18px 22px; background: #fff; border: 1px solid #e5e7eb;
  border-radius: 10px; transition: all .2s; color: inherit;
}
.wp-lesson-card:hover {
  border-color: #4f46e5; box-shadow: 0 4px 16px rgba(79,70,229,.08);
  transform: translateX(4px);
}
.lesson-num {
  font-size: 0.85rem; font-weight: 700; color: #4f46e5;
  min-width: 28px;
}
.lesson-info { flex: 1; }
.lesson-info h4 { font-size: 0.98rem; font-weight: 600; margin-bottom: 4px; }
.lesson-info p { font-size: 0.82rem; color: #888; margin: 0; }
.lesson-arrow { color: #ccc; font-size: 1.1rem; transition: color .2s; }
.wp-lesson-card:hover .lesson-arrow { color: #4f46e5; }

/* ===== Lesson Reading Page ===== */
.lesson-page { padding: 32px 0 80px; }
.lesson-container { max-width: 780px; }
.lesson-container .back-link { margin-bottom: 24px; }
.lesson-container h1 {
  font-size: 2rem; font-weight: 800; line-height: 1.3; margin-bottom: 12px;
}
.lesson-meta { font-size: 0.85rem; color: #888; margin-bottom: 32px; }

/* WordPress content styling */
.lesson-content { font-size: 1.05rem; line-height: 1.8; color: #333; }
.lesson-content h2 { font-size: 1.5rem; font-weight: 700; margin: 36px 0 14px; }
.lesson-content h3 { font-size: 1.2rem; font-weight: 700; margin: 28px 0 10px; }
.lesson-content p { margin-bottom: 18px; }
.lesson-content ul, .lesson-content ol { margin: 0 0 18px 24px; }
.lesson-content li { margin-bottom: 6px; }
.lesson-content img { max-width: 100%; border-radius: 10px; margin: 20px 0; }
.lesson-content pre {
  background: #1e1e2e; color: #cdd6f4; padding: 20px 24px;
  border-radius: 10px; overflow-x: auto; font-size: 0.9rem;
  line-height: 1.6; margin: 20px 0;
}
.lesson-content code {
  background: #f3f4f6; padding: 2px 6px; border-radius: 4px;
  font-size: 0.9em; color: #e11d48;
}
.lesson-content pre code { background: none; padding: 0; color: inherit; }
.lesson-content blockquote {
  border-left: 3px solid #4f46e5; padding: 12px 20px; margin: 20px 0;
  background: #f8f9fb; color: #555; font-style: italic;
}
.lesson-content a { color: #4f46e5; text-decoration: underline; }

/* Lesson navigation */
.lesson-nav {
  display: flex; justify-content: space-between; gap: 16px;
  margin-top: 48px; padding-top: 24px; border-top: 1px solid #e5e7eb;
}
.lesson-nav-btn {
  padding: 12px 20px; border: 1px solid #e5e7eb; border-radius: 10px;
  font-size: 0.9rem; font-weight: 600; color: #444; transition: all .2s;
  max-width: 48%;
}
.lesson-nav-btn:hover { border-color: #4f46e5; color: #4f46e5; }
.lesson-nav-btn.next { margin-left: auto; text-align: right; }