/* ===========================================
   CodeCraft — Modern Minimalist Education
   Design: Clean, spacious, dark accents on white
   Accent: Mint green (#4FFFB0)
   =========================================== */

/* RESET */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #FAFAFA;
  --bg-alt: #F2F2F2;
  --surface: #FFFFFF;
  --text: #0A0A0A;
  --text-secondary: #555555;
  --text-tertiary: #888888;
  --border: #E8E8E8;
  --accent: #4FFFB0;
  --accent-dark: #0A0A0A;
  --radius: 14px;
  --radius-sm: 8px;
  --max-w: 1200px;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Space Mono', 'SF Mono', monospace;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

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

ul {
  list-style: none;
}

/* CONTAINER */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-dark);
  color: var(--bg);
}

.btn-primary:hover {
  background: #1A1A1A;
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--text);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 15px;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn-block {
  width: 100%;
}

/* NAV */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.nav.scrolled {
  border-bottom-color: var(--border);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 32px;
  margin-left: auto;
  margin-right: 32px;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-actions {
  display: flex;
  gap: 8px;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text);
}

/* MOBILE MENU */
.mobile-menu {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  z-index: 99;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  flex-direction: column;
  gap: 12px;
}

.mobile-menu.open {
  display: flex;
}

.mobile-link {
  font-size: 15px;
  font-weight: 500;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

/* HERO */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 100px 0 60px;
  position: relative;
  overflow: hidden;
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  width: 100%;
}

.hero-content {
  max-width: 520px;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 32px;
}

.hero-cta {
  display: flex;
  gap: 12px;
}

.hero-visual {
  position: relative;
}

.hero-img {
  width: 100%;
  border-radius: 20px;
  aspect-ratio: 1;
  object-fit: cover;
}

.hero-badge {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 600;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}

.hero-badge i {
  font-size: 18px;
}

.hero-badge-1 {
  top: 24px;
  left: -20px;
}

.hero-badge-2 {
  bottom: 30px;
  right: -16px;
}

.hero-badge-2 i {
  color: #FFB800;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-tertiary);
  font-size: 20px;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* SECTIONS */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 56px;
}

.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-header p {
  font-size: 16px;
  color: var(--text-secondary);
}

/* COURSES */
.courses {
  background: var(--bg-alt);
}

.courses-filters {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-btn {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 18px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text-secondary);
}

.filter-btn:hover {
  border-color: var(--text);
  color: var(--text);
}

.filter-btn.active {
  background: var(--accent-dark);
  color: var(--bg);
  border-color: var(--accent-dark);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.course-card {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s;
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.08);
}

.course-card.hidden {
  display: none;
}

.course-thumb {
  position: relative;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.course-thumb-gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--c, #4FFFB0) 0%, color-mix(in srgb, var(--c, #4FFFB0) 40%, #1A1A1A) 100%);
  opacity: 0.15;
}

.course-thumb-gradient::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 30%, var(--c, #4FFFB0) 0%, transparent 60%);
  opacity: 0.25;
}

.course-thumb i {
  font-size: 44px;
  color: var(--c, #4FFFB0);
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.1));
}

.course-level {
  position: absolute;
  top: 12px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 100px;
  background: rgba(10, 10, 10, 0.7);
  color: var(--bg);
  z-index: 2;
}

.course-body {
  padding: 20px;
}

.course-body h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.course-body p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
}

.course-meta {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--text-tertiary);
}

.course-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.course-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.course-price {
  font-size: 22px;
  font-weight: 700;
  font-family: var(--font-mono);
}

/* HOW IT WORKS */
.how {
  background: var(--bg);
}

.how-grid {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 20px;
}

.how-step {
  flex: 1;
  max-width: 320px;
  text-align: center;
  padding: 36px 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
}

.how-number {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  background: #0A0A0A;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.how-icon {
  margin-bottom: 20px;
}

.how-icon i {
  font-size: 40px;
  color: var(--text);
}

.how-step h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.how-step p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.how-connector {
  display: flex;
  align-items: center;
  padding-top: 60px;
}

/* INSTRUCTORS */
.instructors {
  background: var(--bg-alt);
}

.instructors-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.instructor-card {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.instructor-card:hover {
  transform: translateY(-4px);
}

.instructor-img-wrap {
  aspect-ratio: 1;
  overflow: hidden;
}

.instructor-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}

.instructor-card:hover .instructor-img {
  transform: scale(1.05);
}

.instructor-info {
  padding: 24px;
}

.instructor-info h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 4px;
}

.instructor-role {
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--accent);
  background: #0A0A0A;
  display: inline-block;
  padding: 3px 10px;
  border-radius: 100px;
  margin-bottom: 12px;
}

.instructor-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.instructor-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.instructor-tags span {
  font-size: 12px;
  font-family: var(--font-mono);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

/* REVIEWS */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
}

.review-stars {
  display: flex;
  gap: 2px;
  margin-bottom: 16px;
}

.review-stars i {
  font-size: 18px;
  color: #FFB800;
}

.review-text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  margin-bottom: 20px;
  flex: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-dark);
  color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
}

.review-author strong {
  display: block;
  font-size: 14px;
}

.review-author span {
  font-size: 12px;
  color: var(--text-tertiary);
}

/* REGISTER / PRICING */
.register {
  background: var(--bg-alt);
}

.register-grid {
  max-width: 800px;
  margin: 0 auto;
}

.register-info h2 {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: 12px;
}

.register-info > p {
  text-align: center;
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 48px;
}

.pricing-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.pricing-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  position: relative;
}

.pricing-card.featured {
  border-color: var(--accent-dark);
  border-width: 2px;
}

.pricing-popular {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-dark);
  color: var(--bg);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 100px;
  white-space: nowrap;
}

.pricing-label {
  font-size: 14px;
  font-family: var(--font-mono);
  color: var(--text-tertiary);
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 36px;
  font-weight: 700;
  font-family: var(--font-mono);
  margin-bottom: 8px;
}

.pricing-price span {
  font-size: 16px;
  font-weight: 400;
  color: var(--text-tertiary);
}

.pricing-card > p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.pricing-card ul {
  margin-bottom: 24px;
}

.pricing-card li {
  font-size: 14px;
  color: var(--text-secondary);
  padding: 6px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-card li i {
  color: var(--accent);
  font-size: 16px;
  background: #0A0A0A;
  border-radius: 50%;
  padding: 2px;
}

/* FOOTER */
.footer {
  background: #0A0A0A;
  color: #AAAAAA;
  padding: 60px 0 0;
}

.footer .nav-logo span {
  color: #FFFFFF;
}

.footer .nav-logo svg rect {
  fill: #1A1A1A;
}

.footer-brand p {
  font-size: 14px;
  margin-top: 16px;
  max-width: 280px;
  line-height: 1.6;
  color: #888888;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 60px;
  padding-bottom: 48px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: #888888;
  padding: 4px 0;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  border-top: 1px solid #1A1A1A;
  padding: 24px 0;
}

.footer-bottom p {
  font-size: 13px;
  color: #666666;
}

/* SCROLL REVEAL */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* RESPONSIVE */
@media (max-width: 968px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-title {
    font-size: 40px;
  }

  .hero-visual {
    max-width: 420px;
  }

  .courses-grid,
  .instructors-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .how-grid {
    flex-direction: column;
    align-items: center;
  }

  .how-step {
    width: 100%;
    max-width: 400px;
  }

  .how-connector {
    display: none;
  }

  .pricing-cards {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .nav-links,
  .nav-actions {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .hero {
    padding: 80px 0 40px;
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-sub {
    font-size: 15px;
  }

  .hero-badge-1 {
    left: 0;
  }

  .hero-badge-2 {
    right: 0;
  }

  .section {
    padding: 64px 0;
  }

  .section-header h2 {
    font-size: 28px;
  }

  .courses-grid,
  .instructors-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .footer-links {
    grid-template-columns: 1fr 1fr;
  }
}

/* REDUCED MOTION */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}