/* ==========================================================
   SPACEUNIVERS STYLE
   Organized by section. CSS variables power light/dark theme.
========================================================== */

/* -------------------- THEME VARIABLES -------------------- */
:root {
  --color-bg: #f7f9fc;
  --color-bg-alt: #eef4ff;
  --color-bg-soft: #f8fafc;
  --color-card: #ffffff;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-border: #e2e8f0;
  --color-footer-bg: #0f172a;
  --shadow-sm: 0 5px 20px rgba(0, 0, 0, .08);
  --shadow-md: 0 10px 25px rgba(0, 0, 0, .08);
}

[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-bg-alt: #111827;
  --color-bg-soft: #131c2e;
  --color-card: #1a2436;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-border: #263041;
  --color-footer-bg: #060b16;
  --shadow-sm: 0 5px 20px rgba(0, 0, 0, .35);
  --shadow-md: 0 10px 25px rgba(0, 0, 0, .35);
}

/* -------------------- RESET & BASE -------------------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  transition: background .3s, color .3s;
}

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

section {
  overflow: hidden;
}

.container {
  width: 90%;
  max-width: 1280px;
  margin: auto;
}

.title {
  text-align: center;
  font-size: 42px;
  margin-bottom: 60px;
  color: var(--color-text);
}

/* -------------------- HEADER -------------------- */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--color-card);
  box-shadow: var(--shadow-sm);
  z-index: 999;
  transition: box-shadow .3s, background .3s;
}

.navbar {
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 30px;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

nav {
  display: flex;
  gap: 30px;
}

nav a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-weight: 500;
  transition: .3s;
}

nav a:hover {
  color: var(--color-primary);
}

.buttons {
  display: flex;
  align-items: center;
  gap: 15px;
}

.theme-toggle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  background: transparent;
  color: var(--color-text);
  font-size: 16px;
  cursor: pointer;
  transition: .3s;
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.login {
  padding: 12px 24px;
  border: 2px solid var(--color-primary);
  border-radius: 8px;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
}

.register {
  padding: 12px 24px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: .3s;
}

.register:hover {
  background: var(--color-primary-dark);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  border: 2px solid var(--color-border);
  background: transparent;
  color: var(--color-text);
  font-size: 18px;
  cursor: pointer;
}

/* -------------------- HERO -------------------- */
.hero {
  padding: 170px 0 100px;
  background: linear-gradient(135deg, #2563eb, #4f46e5);
  color: #fff;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 70px;
  align-items: center;
}

.badge {
  display: inline-block;
  background: #fff;
  color: #2563eb;
  padding: 10px 22px;
  border-radius: 50px;
  font-weight: 600;
}

.hero-left h1 {
  font-size: 60px;
  line-height: 1.15;
  margin: 25px 0;
}

.hero-left p {
  font-size: 20px;
  line-height: 1.8;
  opacity: .9;
  margin-bottom: 35px;
}

.hero-buttons {
  display: flex;
  gap: 20px;
}

.btn-primary {
  background: #fff;
  color: #2563eb;
  padding: 16px 35px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: bold;
  border: none;
  cursor: pointer;
  display: inline-block;
}

.btn-primary:hover {
  background: #e2e8f0;
}

.btn-secondary {
  border: 2px solid #fff;
  color: #fff;
  padding: 16px 35px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: bold;
}

.btn-secondary:hover {
  background: #fff;
  color: #2563eb;
}

.hero-right img {
  width: 100%;
  max-width: 550px;
  margin: auto;
}

/* -------------------- STATS -------------------- */
.stats {
  padding: 90px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
}

.stat {
  background: var(--color-card);
  padding: 35px;
  border-radius: 18px;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.stat h2 {
  font-size: 42px;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.stat p {
  margin-top: 10px;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* -------------------- FEATURES / CATEGORIES -------------------- */
.features,
.categories {
  padding: 100px 0;
}

.categories {
  background: var(--color-bg-soft);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
}

.feature {
  background: var(--color-card);
  padding: 35px;
  border-radius: 18px;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: .3s;
}

.feature:hover {
  transform: translateY(-10px);
}

.feature i {
  font-size: 45px;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.feature h3 {
  margin-bottom: 15px;
}

.feature p {
  margin-top: 12px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* -------------------- SEARCH / NEWSLETTER -------------------- */
.search-section {
  padding: 90px 0;
  background: var(--color-bg);
}

.newsletter {
  padding: 100px 0;
  background: var(--color-bg-soft);
}

.search-box {
  max-width: 800px;
  margin: 40px auto 0;
  display: flex;
  background: var(--color-card);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.search-box input {
  flex: 1;
  padding: 18px 20px;
  border: none;
  outline: none;
  font-size: 16px;
  background: var(--color-card);
  color: var(--color-text);
}

.search-box button {
  padding: 0 30px;
  border: none;
  background: var(--color-primary);
  color: #fff;
  font-size: 16px;
  cursor: pointer;
  transition: .3s;
}

.search-box button:hover {
  background: var(--color-primary-dark);
}

/* -------------------- COURSES -------------------- */
.courses {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.course-card {
  background: var(--color-card);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: .3s;
}

.course-card:hover {
  transform: translateY(-10px);
}

.course-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: #dbeafe;
}

.course-body {
  padding: 25px;
}

.course-body span {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 6px 15px;
  border-radius: 30px;
  font-size: 14px;
  margin-bottom: 15px;
}

.course-body h3 {
  margin-bottom: 15px;
  font-size: 22px;
}

.course-body p {
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.explore-btn {
  display: inline-block;
  padding: 12px 24px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: .3s;
  font-family: inherit;
  font-size: 15px;
}

.explore-btn:hover {
  background: var(--color-primary-dark);
}

/* -------------------- INSTRUCTORS -------------------- */
.instructors {
  padding: 100px 0;
  background: var(--color-bg);
}

.instructor-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.instructor-card {
  background: var(--color-card);
  padding: 40px 30px;
  border-radius: 20px;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: .3s;
}

.instructor-card:hover {
  transform: translateY(-10px);
}

.instructor-avatar {
  width: 90px;
  height: 90px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #4f46e5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 34px;
  color: #fff;
}

.instructor-card h3 {
  margin-bottom: 8px;
}

.instructor-role {
  display: inline-block;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 15px;
}

.instructor-card p {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* -------------------- PRICING -------------------- */
.pricing {
  padding: 100px 0;
  background: var(--color-card);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.price-card {
  background: var(--color-bg-soft);
  padding: 40px;
  border-radius: 20px;
  text-align: center;
  position: relative;
  transition: .3s;
  box-shadow: var(--shadow-md);
  color: var(--color-text);
}

.price-card:hover {
  transform: translateY(-10px);
}

.price-card.active {
  background: var(--color-primary);
  color: #fff;
}

.price-card.active a {
  background: #fff;
  color: var(--color-primary);
}

.price-card.active ul li {
  color: #fff;
}

.popular {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: #f59e0b;
  color: #fff;
  padding: 8px 20px;
  border-radius: 30px;
  font-size: 14px;
  font-weight: bold;
}

.price-card h1 {
  font-size: 50px;
  margin: 20px 0;
}

.price-card h1 small {
  font-size: 16px;
  font-weight: 400;
}

.price-card ul {
  list-style: none;
  margin: 30px 0;
}

.price-card ul li {
  padding: 10px 0;
  color: var(--color-text-muted);
}

.price-card a {
  display: inline-block;
  padding: 14px 30px;
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
}

/* -------------------- TESTIMONIALS -------------------- */
.testimonials {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.testimonial {
  background: var(--color-card);
  padding: 35px;
  border-radius: 20px;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.testimonial h3 {
  margin-bottom: 10px;
}

.testimonial p {
  margin-top: 12px;
  line-height: 1.8;
  color: var(--color-text-muted);
}

/* -------------------- FAQ -------------------- */
.faq {
  padding: 100px 0;
  background: var(--color-card);
}

.faq-item {
  background: var(--color-bg-soft);
  padding: 22px 25px;
  border-radius: 15px;
  margin-bottom: 16px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, .05);
  cursor: pointer;
}

.faq-item summary {
  font-weight: 600;
  color: var(--color-primary);
  list-style: none;
  position: relative;
  padding-right: 30px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-size: 20px;
  color: var(--color-primary);
  transition: transform .3s;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  margin-top: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* -------------------- CTA -------------------- */
.cta {
  padding: 100px 0;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  text-align: center;
  color: #fff;
}

.cta h2 {
  font-size: 48px;
  margin-bottom: 20px;
}

.cta p {
  font-size: 20px;
  margin-bottom: 35px;
}

.cta a {
  display: inline-block;
  padding: 18px 40px;
  background: #fff;
  color: #2563eb;
  text-decoration: none;
  font-weight: bold;
  border-radius: 10px;
}

/* -------------------- FOOTER -------------------- */
footer {
  background: var(--color-footer-bg);
  padding: 80px 0 30px;
  color: #fff;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.footer-grid h3 {
  margin-bottom: 20px;
}

.footer-grid ul {
  list-style: none;
}

.footer-grid ul li {
  margin-bottom: 10px;
}

.footer-grid a {
  color: #cbd5e1;
  text-decoration: none;
}

footer p {
  color: #cbd5e1;
  line-height: 1.8;
}

footer a:hover {
  color: #fff;
}

footer hr {
  margin: 40px 0;
  border: none;
  height: 1px;
  background: #334155;
}

.copyright {
  text-align: center;
  color: #94a3b8;
}

/* -------------------- SYLLABUS MODAL -------------------- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, .6);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background: var(--color-card);
  color: var(--color-text);
  max-width: 480px;
  width: 100%;
  border-radius: 20px;
  padding: 40px;
  position: relative;
  max-height: 85vh;
  overflow-y: auto;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: transparent;
  border: none;
  font-size: 26px;
  cursor: pointer;
  color: var(--color-text-muted);
  line-height: 1;
}

.modal-badge {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 6px 15px;
  border-radius: 30px;
  font-size: 13px;
  margin-bottom: 15px;
}

.modal-box h3 {
  font-size: 24px;
  margin-bottom: 20px;
}

.modal-list {
  list-style: none;
  margin-bottom: 25px;
}

.modal-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
  display: flex;
  gap: 10px;
}

.modal-list li i {
  color: var(--color-primary);
}

.modal-cta {
  width: 100%;
  text-align: center;
}

/* -------------------- SCROLL ANIMATIONS -------------------- */
.hidden {
  opacity: 0;
  transform: translateY(40px);
  transition: .7s;
}

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

/* -------------------- BACK TO TOP -------------------- */
#topBtn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border: none;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  display: none;
  box-shadow: 0 10px 20px rgba(0, 0, 0, .2);
  z-index: 999;
  transition: background .3s;
}

#topBtn:hover {
  background: var(--color-primary-dark);
}

/* ==========================================================
   RESPONSIVE
========================================================== */
@media (max-width: 992px) {
  .hero-content,
  .stats-grid,
  .feature-grid,
  .course-grid,
  .pricing-grid,
  .testimonial-grid,
  .instructor-grid,
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .navbar {
    height: 80px;
  }

  nav {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background: var(--color-card);
    flex-direction: column;
    padding: 20px;
    gap: 15px;
    box-shadow: var(--shadow-sm);
    transform: translateY(-150%);
    opacity: 0;
    transition: .3s;
  }

  nav.active {
    transform: translateY(0);
    opacity: 1;
  }

  .hero {
    text-align: center;
    padding-top: 190px;
  }

  .hero-left h1 {
    font-size: 38px;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-content,
  .stats-grid,
  .feature-grid,
  .course-grid,
  .pricing-grid,
  .testimonial-grid,
  .instructor-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .price-card.active {
    transform: none;
  }

  .search-box {
    flex-direction: column;
  }

  .search-box button {
    padding: 18px;
    width: 100%;
  }

  .title {
    font-size: 32px;
  }

  .course-body h3 {
    font-size: 20px;
  }

  .cta h2 {
    font-size: 34px;
  }

  .buttons .login {
    display: none;
  }

  .buttons .register {
    padding: 10px 16px;
    font-size: 14px;
  }
}
/* ==========================================================
   SPACEUNIVERS STYLE
   Organized by section. CSS variables power light/dark theme.
========================================================== */

/* -------------------- THEME VARIABLES -------------------- */
:root {
  --color-bg: #f7f9fc;
  --color-bg-alt: #eef4ff;
  --color-bg-soft: #f8fafc;
  --color-card: #ffffff;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-border: #e2e8f0;
  --color-footer-bg: #0f172a;
  --shadow-sm: 0 5px 20px rgba(0, 0, 0, .08);
  --shadow-md: 0 10px 25px rgba(0, 0, 0, .08);
}

[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-bg-alt: #111827;
  --color-bg-soft: #131c2e;
  --color-card: #1a2436;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-border: #263041;
  --color-footer-bg: #060b16;
  --shadow-sm: 0 5px 20px rgba(0, 0, 0, .35);
  --shadow-md: 0 10px 25px rgba(0, 0, 0, .35);
}

/* -------------------- RESET & BASE -------------------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  transition: background .3s, color .3s;
}

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

section {
  overflow: hidden;
}

.container {
  width: 90%;
  max-width: 1280px;
  margin: auto;
}

.title {
  text-align: center;
  font-size: 42px;
  margin-bottom: 60px;
  color: var(--color-text);
}

/* -------------------- HEADER -------------------- */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--color-card);
  box-shadow: var(--shadow-sm);
  z-index: 999;
  transition: box-shadow .3s, background .3s;
}

.navbar {
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 30px;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

nav {
  display: flex;
  gap: 30px;
}

nav a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-weight: 500;
  transition: .3s;
}

nav a:hover {
  color: var(--color-primary);
}

nav a.active {
  color: var(--color-primary);
  font-weight: 700;
}

.buttons {
  display: flex;
  align-items: center;
  gap: 15px;
}

.theme-toggle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  background: transparent;
  color: var(--color-text);
  font-size: 16px;
  cursor: pointer;
  transition: .3s;
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.login {
  padding: 12px 24px;
  border: 2px solid var(--color-primary);
  border-radius: 8px;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
}

.register {
  padding: 12px 24px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: .3s;
}

.register:hover {
  background: var(--color-primary-dark);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  border: 2px solid var(--color-border);
  background: transparent;
  color: var(--color-text);
  font-size: 18px;
  cursor: pointer;
}

/* -------------------- HERO -------------------- */
.hero {
  padding: 170px 0 100px;
  background: linear-gradient(135deg, #2563eb, #4f46e5);
  color: #fff;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 70px;
  align-items: center;
}

.badge {
  display: inline-block;
  background: #fff;
  color: #2563eb;
  padding: 10px 22px;
  border-radius: 50px;
  font-weight: 600;
}

.hero-left h1 {
  font-size: 60px;
  line-height: 1.15;
  margin: 25px 0;
}

.hero-left p {
  font-size: 20px;
  line-height: 1.8;
  opacity: .9;
  margin-bottom: 35px;
}

.hero-buttons {
  display: flex;
  gap: 20px;
}

.btn-primary {
  background: #fff;
  color: #2563eb;
  padding: 16px 35px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: bold;
  border: none;
  cursor: pointer;
  display: inline-block;
}

.btn-primary:hover {
  background: #e2e8f0;
}

.btn-secondary {
  border: 2px solid #fff;
  color: #fff;
  padding: 16px 35px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: bold;
}

.btn-secondary:hover {
  background: #fff;
  color: #2563eb;
}

.hero-right img {
  width: 100%;
  max-width: 550px;
  margin: auto;
  border-radius: 24px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, .25);
  object-fit: cover;
  aspect-ratio: 550 / 480;
}

/* -------------------- STATS -------------------- */
.stats {
  padding: 90px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
}

.stat {
  background: var(--color-card);
  padding: 35px;
  border-radius: 18px;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.stat h2 {
  font-size: 42px;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.stat p {
  margin-top: 10px;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* -------------------- FEATURES / CATEGORIES -------------------- */
.features,
.categories {
  padding: 100px 0;
}

.categories {
  background: var(--color-bg-soft);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
}

.feature {
  background: var(--color-card);
  padding: 35px;
  border-radius: 18px;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: .3s;
}

.feature:hover {
  transform: translateY(-10px);
}

.feature i {
  font-size: 45px;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.feature h3 {
  margin-bottom: 15px;
}

.feature p {
  margin-top: 12px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* -------------------- SEARCH / NEWSLETTER -------------------- */
.search-section {
  padding: 90px 0;
  background: var(--color-bg);
}

.newsletter {
  padding: 100px 0;
  background: var(--color-bg-soft);
}

.search-box {
  max-width: 800px;
  margin: 40px auto 0;
  display: flex;
  background: var(--color-card);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.search-box input {
  flex: 1;
  padding: 18px 20px;
  border: none;
  outline: none;
  font-size: 16px;
  background: var(--color-card);
  color: var(--color-text);
}

.search-box button {
  padding: 0 30px;
  border: none;
  background: var(--color-primary);
  color: #fff;
  font-size: 16px;
  cursor: pointer;
  transition: .3s;
}

.search-box button:hover {
  background: var(--color-primary-dark);
}

/* -------------------- COURSES -------------------- */
.courses {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.course-card {
  background: var(--color-card);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: .3s;
}

.course-card:hover {
  transform: translateY(-10px);
}

.course-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: #dbeafe;
}

.course-body {
  padding: 25px;
}

.course-body span {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 6px 15px;
  border-radius: 30px;
  font-size: 14px;
  margin-bottom: 15px;
}

.course-body h3 {
  margin-bottom: 15px;
  font-size: 22px;
}

.course-body p {
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.explore-btn {
  display: inline-block;
  padding: 12px 24px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: .3s;
  font-family: inherit;
  font-size: 15px;
}

.explore-btn:hover {
  background: var(--color-primary-dark);
}

/* -------------------- INSTRUCTORS -------------------- */
.instructors {
  padding: 100px 0;
  background: var(--color-bg);
}

.instructor-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.instructor-card {
  background: var(--color-card);
  padding: 40px 30px;
  border-radius: 20px;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: .3s;
}

.instructor-card:hover {
  transform: translateY(-10px);
}

.instructor-avatar {
  width: 90px;
  height: 90px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #4f46e5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 34px;
  color: #fff;
}

.instructor-card h3 {
  margin-bottom: 8px;
}

.instructor-role {
  display: inline-block;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 15px;
}

.instructor-card p {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* -------------------- PRICING -------------------- */
.pricing {
  padding: 100px 0;
  background: var(--color-card);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.price-card {
  background: var(--color-bg-soft);
  padding: 40px;
  border-radius: 20px;
  text-align: center;
  position: relative;
  transition: .3s;
  box-shadow: var(--shadow-md);
  color: var(--color-text);
}

.price-card:hover {
  transform: translateY(-10px);
}

.price-card.active {
  background: var(--color-primary);
  color: #fff;
}

.price-card.active a {
  background: #fff;
  color: var(--color-primary);
}

.price-card.active ul li {
  color: #fff;
}

.popular {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: #f59e0b;
  color: #fff;
  padding: 8px 20px;
  border-radius: 30px;
  font-size: 14px;
  font-weight: bold;
}

.price-card h1 {
  font-size: 50px;
  margin: 20px 0;
}

.price-card h1 small {
  font-size: 16px;
  font-weight: 400;
}

.price-card ul {
  list-style: none;
  margin: 30px 0;
}

.price-card ul li {
  padding: 10px 0;
  color: var(--color-text-muted);
}

.price-card a {
  display: inline-block;
  padding: 14px 30px;
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
}

/* -------------------- TESTIMONIALS -------------------- */
.testimonials {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.testimonial {
  background: var(--color-card);
  padding: 35px;
  border-radius: 20px;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.testimonial h3 {
  margin-bottom: 10px;
}

.testimonial p {
  margin-top: 12px;
  line-height: 1.8;
  color: var(--color-text-muted);
}

/* -------------------- FAQ -------------------- */
.faq {
  padding: 100px 0;
  background: var(--color-card);
}

.faq-item {
  background: var(--color-bg-soft);
  padding: 22px 25px;
  border-radius: 15px;
  margin-bottom: 16px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, .05);
  cursor: pointer;
}

.faq-item summary {
  font-weight: 600;
  color: var(--color-primary);
  list-style: none;
  position: relative;
  padding-right: 30px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-size: 20px;
  color: var(--color-primary);
  transition: transform .3s;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  margin-top: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* -------------------- CTA -------------------- */
.cta {
  padding: 100px 0;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  text-align: center;
  color: #fff;
}

.cta h2 {
  font-size: 48px;
  margin-bottom: 20px;
}

.cta p {
  font-size: 20px;
  margin-bottom: 35px;
}

.cta a {
  display: inline-block;
  padding: 18px 40px;
  background: #fff;
  color: #2563eb;
  text-decoration: none;
  font-weight: bold;
  border-radius: 10px;
}

/* -------------------- FOOTER -------------------- */
footer {
  background: var(--color-footer-bg);
  padding: 80px 0 30px;
  color: #fff;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.footer-grid h3 {
  margin-bottom: 20px;
}

.footer-grid ul {
  list-style: none;
}

.footer-grid ul li {
  margin-bottom: 10px;
}

.footer-grid a {
  color: #cbd5e1;
  text-decoration: none;
}

footer p {
  color: #cbd5e1;
  line-height: 1.8;
}

footer a:hover {
  color: #fff;
}

footer hr {
  margin: 40px 0;
  border: none;
  height: 1px;
  background: #334155;
}

.copyright {
  text-align: center;
  color: #94a3b8;
}

/* -------------------- SYLLABUS MODAL -------------------- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, .6);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background: var(--color-card);
  color: var(--color-text);
  max-width: 480px;
  width: 100%;
  border-radius: 20px;
  padding: 40px;
  position: relative;
  max-height: 85vh;
  overflow-y: auto;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: transparent;
  border: none;
  font-size: 26px;
  cursor: pointer;
  color: var(--color-text-muted);
  line-height: 1;
}

.modal-badge {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 6px 15px;
  border-radius: 30px;
  font-size: 13px;
  margin-bottom: 15px;
}

.modal-box h3 {
  font-size: 24px;
  margin-bottom: 20px;
}

.modal-list {
  list-style: none;
  margin-bottom: 25px;
}

.modal-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
  display: flex;
  gap: 10px;
}

.modal-list li i {
  color: var(--color-primary);
}

.modal-cta {
  width: 100%;
  text-align: center;
}

/* -------------------- SCROLL ANIMATIONS -------------------- */
.hidden {
  opacity: 0;
  transform: translateY(40px);
  transition: .7s;
}

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

/* -------------------- BACK TO TOP -------------------- */
#topBtn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border: none;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  display: none;
  box-shadow: 0 10px 20px rgba(0, 0, 0, .2);
  z-index: 999;
  transition: background .3s;
}

#topBtn:hover {
  background: var(--color-primary-dark);
}

/* -------------------- ABOUT: STORY SECTION -------------------- */
.story {
  padding: 100px 0;
  background: var(--color-card);
}

.story-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.story-text h2 {
  font-size: 36px;
  margin-bottom: 20px;
  color: var(--color-text);
}

.story-text p {
  color: var(--color-text-muted);
  line-height: 1.9;
  margin-bottom: 18px;
  font-size: 16px;
}

.story-img img {
  width: 100%;
  border-radius: 24px;
  box-shadow: var(--shadow-md);
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

/* -------------------- CONTACT PAGE -------------------- */
.contact-section {
  padding: 100px 0;
  background: var(--color-bg);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 40px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-card {
  background: var(--color-card);
  padding: 28px;
  border-radius: 18px;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: flex-start;
  gap: 18px;
}

.contact-card i {
  font-size: 24px;
  color: var(--color-primary);
  background: var(--color-bg-alt);
  width: 50px;
  height: 50px;
  min-width: 50px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-card h3 {
  margin-bottom: 6px;
  font-size: 17px;
}

.contact-card p {
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.6;
}

.contact-form-box {
  background: var(--color-card);
  padding: 40px;
  border-radius: 20px;
  box-shadow: var(--shadow-md);
}

.contact-form-box h3 {
  font-size: 24px;
  margin-bottom: 25px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 18px;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group.full {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  padding: 14px 16px;
  border: 2px solid var(--color-border);
  border-radius: 10px;
  font-family: inherit;
  font-size: 15px;
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: .3s;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 130px;
}

.contact-form-box .btn-submit {
  width: 100%;
  padding: 16px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: .3s;
}

.contact-form-box .btn-submit:hover {
  background: var(--color-primary-dark);
}

@media (max-width: 992px) {
  .story-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .story-img {
    order: -1;
  }
}

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 992px) {
  .hero-content,
  .stats-grid,
  .feature-grid,
  .course-grid,
  .pricing-grid,
  .testimonial-grid,
  .instructor-grid,
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .navbar {
    height: 80px;
  }

  nav {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background: var(--color-card);
    flex-direction: column;
    padding: 20px;
    gap: 15px;
    box-shadow: var(--shadow-sm);
    transform: translateY(-150%);
    opacity: 0;
    transition: .3s;
  }

  nav.active {
    transform: translateY(0);
    opacity: 1;
  }

  .hero {
    text-align: center;
    padding-top: 190px;
  }

  .hero-left h1 {
    font-size: 38px;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-content,
  .stats-grid,
  .feature-grid,
  .course-grid,
  .pricing-grid,
  .testimonial-grid,
  .instructor-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .price-card.active {
    transform: none;
  }

  .search-box {
    flex-direction: column;
  }

  .search-box button {
    padding: 18px;
    width: 100%;
  }

  .title {
    font-size: 32px;
  }

  .course-body h3 {
    font-size: 20px;
  }

  .cta h2 {
    font-size: 34px;
  }

  .buttons .login {
    display: none;
  }

  .buttons .register {
    padding: 10px 16px;
    font-size: 14px;
  }
}