@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;
  font-weight: 300;
  src: url('../assets/fonts/NotoSansSC-Light.ttf') format('truetype');
}

@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;
  font-weight: 400;
  src: url('../assets/fonts/NotoSansSC-Regular.ttf') format('truetype');
}

@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;
  font-weight: 500;
  src: url('../assets/fonts/NotoSansSC-Medium.ttf') format('truetype');
}

@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;
  font-weight: 600;
  src: url('../assets/fonts/NotoSansSC-SemiBold.ttf') format('truetype');
}

@font-face {
  font-family: 'Noto Sans SC';
  font-style: normal;
  font-weight: 700;
  src: url('../assets/fonts/NotoSansSC-Bold.ttf') format('truetype');
}

:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);


  --bg: #f5f7ff;
  --header-bg: rgba(255, 255, 255, 0.9);
  --header-border: rgba(0, 0, 0, 0.08);
  --card-bg: rgba(255, 255, 255, 0.8);
  --text-primary: #0a0a0a;
  --text-secondary: rgba(18, 24, 35, 0.7);
  --glass-bg: rgba(255, 255, 255, 0.5);
  --shadow: rgba(0, 0, 0, 0.08);
}


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

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-primary);
  background: var(--bg);
  overflow-x: hidden;
  line-height: 1.6;
}


@keyframes float {
  0% { transform: translateY(0px) rotate(0deg); }
  33% { transform: translateY(-30px) rotate(120deg); }
  66% { transform: translateY(20px) rotate(240deg); }
  100% { transform: translateY(0px) rotate(360deg); }
}

header {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--header-bg);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--header-border);
  z-index: 1000;
  padding: 20px 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
}

.logo {
  font-weight: 700;
  font-size: 24px;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.logo-img {
  height:130px;
  width: auto;
  display: block;
}
nav {
  display: flex;
  gap: 30px;
}

nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 14px;
  transition: all 0.3s ease;
  position: relative;
}

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

nav a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width 0.3s ease;
}

nav a:hover::after {
  width: 100%;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 4px;
}

.mobile-menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  transition: 0.3s;
}


.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 20px 80px;
  background: #ffffff;
  position: relative;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: 20px;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.hero p {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: rgba(34, 34, 34, 0.85);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section p {
 
  font-size: 18px;
  max-width: 700px;
  margin: 0 auto 60px;
  line-height: 1.7;
}

#problem .section-description,
#service .section-description {
  color: rgba(226, 224, 224, 0.9) !important;
}

.cta {
  background: var(--primary-gradient);
  color: white;
  padding: 16px 32px;
  border: none;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 8px 32px rgba(102, 126, 234, 0.3);
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.cta:hover::before {
  left: 100%;
}

.cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(102, 126, 234, 0.4);
}

.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px 20px;
  text-align: center;
}

.section h2 {
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 20px;
  color: rgba(20, 25, 32, 0.95);
}

.challenges-grid h2,
.solutions-grid h2,
.courses h2,
.signup h2 {
  color: rgba(240, 240, 240, 0.95);
}

.courses .section-description,
.courses .start-date {
  color: rgba(240, 240, 240, 0.85);
  text-shadow: none;
}

.section p {
  color: var(--text-secondary);
  font-size: 18px;
  max-width: 700px;
  margin: 0 auto 60px;
  line-height: 1.7;
}

.lecturer {
  max-width: 900px;
  margin: 0 auto;
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 50px;
  line-height: 1.8;
  color: var(--text-secondary);
  overflow: auto;
  position: relative;
}

.lecturer-header {
  display: block;
  margin-bottom: 16px;
}

.lecturer-header h3 {
  margin: 0 0 8px 0;
  font-size: 1.3rem;
  color: var(--text-primary);
}

.lecturer-photo {
  width: 120px;
  height: 120px;
  border-radius: 16px;
  object-fit: cover;
  border: 2px solid rgba(255, 255, 255, 0.8);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.2);
  float: right;
  margin: 0 0 16px 20px;
}

.lecturer-content {
  margin-top: 16px;
}

.lecturer ul {
  margin-left: 20px;
  margin-top: 20px;
  list-style-position: inside;
}



.why-us {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
  padding: 100px 20px;
}

.why-us-content {
  text-align: left;
}

.why-us-content h2 {
  margin-bottom: 18px;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.why-us-content p {
  color: rgba(34, 34, 34, 0.85);
  font-size: 18px;
  line-height: 1.7;
  max-width: 620px;
}

.why-us-visual {
  width: 100%;
  height: 260px;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.12);
  position: relative;
  overflow: hidden;
}

.why-us-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.why-us-visual::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.4), rgba(255, 255, 255, 0.05));
  border-radius: 20px;
}

@media (max-width: 768px) {
  .why-us {
    grid-template-columns: 1fr;
  }

  .why-us-visual {
    height: 220px;
  }
}


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

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  margin-top: 60px;
}

.courses .card {
  text-align: left;
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 40px 30px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  min-height: 310px;

}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--accent-gradient);

}



.card ul.course-list {
  text-align: left;
  margin: 20px 0;
  padding-left: 20px;
  color: var(--text-secondary);
}

.card ul.course-list li {
  margin-bottom: 10px;
  line-height: 1.5;
}

.card i {
  font-size: 48px;
  color: #667eea;
  margin-bottom: 20px;
  display: block;
}

.card h3 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--text-primary);
}

.courses .card p {
  line-height: 1.0;
  margin-bottom: 0.5em;
}

.card p {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.challenges-grid {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  position: relative;
}

.challenges-grid .section {
  position: relative;
  z-index: 2;
}

.solutions-grid {
  background: linear-gradient(135deg, #2d1b69 0%, #11998e 50%, #38ef7d 100%);
  position: relative;
}

.courses {
  background: linear-gradient(135deg, #2d1b69 0%, #11998e 50%, #38ef7d 100%);
  position: relative;
  margin-bottom: 80px;
  padding-bottom: 320px;
}

.challenges-grid .section p,
.solutions-grid .section p,
.courses .section-description {
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.lecturer {
  max-width: 900px;
  margin: 0 auto;
  text-align: left;
  line-height: 1.8;
  font-size: 18px;
  color: var(--text-secondary);
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 50px;
}

.lecturer-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 20px;
}

.lecturer-header h3 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
}

.lecturer-photo {
  height: 260px;
  width:auto;
  object-fit: cover;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.12);
  position: relative;
  overflow: hidden;
}

.lecturer-content {
  margin-top: 20px;
}

.lecturer strong {
  color: var(--text-primary);
  font-weight: 600;
  display: block;
  margin-bottom: 20px;
  font-size: 20px;
}

.lecturer ul {
  margin-left: 20px;
  margin-top: 20px;
  list-style-position: inside;
}

.lecturer li {
  margin-bottom: 10px;
}

.signup {
  background: var(--primary-gradient);
  padding: 100px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.signup::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?ixlib=rb-4.0.3&auto=format&fit=crop&w=2072&q=80') center/cover no-repeat;
  opacity: 0.1;
  z-index: 1;
  pointer-events: none;
}

.signup .section {
  position: relative;
  z-index: 2;
  padding: 0;
}

form {
  max-width: 500px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 40px;
}

input, textarea {
  padding: 16px 20px;
  font-size: 16px;
  border-radius: 12px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  color: var(--text-primary);
  font-family: inherit;
  transition: all 0.3s ease;
}

input::placeholder, textarea::placeholder {
  color: var(--text-secondary);
}

input:focus, textarea:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
}

button.submit {
  background: var(--dark-bg);
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.2);
  padding: 16px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s ease;
  margin-top: 10px;
}

button.submit:hover {
  background: white;
  color: var(--dark-bg);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

footer {
  text-align: center;
  padding: 40px 20px;
  font-size: 14px;
  color: white;
  background: #000000;
  backdrop-filter: none;
}

footer a {
  color: white;
  text-decoration: none;
  transition: color 0.3s ease;
}
/* Mobile Menu */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }

  nav {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--header-bg);
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 40px;
    transition: left 0.3s ease;
    z-index: 999;
  }

  nav a {
    font-size: 18px;
    color: var(--text-primary);
  }

  nav.active {
    left: 0;
  }

  nav a {
    font-size: 18px;
  }

  .mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }

  .hero {
    padding: 100px 20px 60px;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .section {
    padding: 80px 20px;
  }

  .grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

  .card {
    padding: 30px 20px;
  }

  .lecturer {
    padding: 30px 20px;
    margin: 20px;
  }

  form {
    margin: 20px;
  }
}

/* Tablet */
@media (max-width: 1024px) and (min-width: 769px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .hero h1 {
    font-size: 3rem;
  }

  .section {
    padding: 80px 20px;
  }
}

/* Animations */

.card.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.card.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Scroll animations */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}


@media (max-width: 768px) {
  .lecturer {
    padding: 30px 20px;
  }

  .lecturer-header {
    display: block;
  }

  .lecturer-photo {
    float: none;
    display: block;
    margin: 0 auto 16px auto;
    width: 150px;
    height: 170px;
  }
}