:root {
  --primary-blue: #0052cc;
  --primary-hover: #0041a3;
  --accent-yellow: #f1b400;
  --accent-hover: #e0a600;
  --bg-color: #f4f7fc;
  --card-bg: #ffffff;
  --text-main: #0a192f;
  --text-muted: #5f6c7d;
  --border-color: #e2e8f0;
  --shadow-color: rgba(0, 0, 0, 0.05);
  --select-arrow: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%230052cc' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'></polyline></svg>");
}

body.dark-theme {
  --bg-color: #0d1117;
  --card-bg: #161b22;
  --text-main: #f0f6fc;
  --text-muted: #8b949e;
  --border-color: #30363d;
  --shadow-color: rgba(0, 0, 0, 0.4);
  --select-arrow: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f1b400' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'></polyline></svg>");
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Roboto, -apple-system, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-header h2 {
  font-size: 34px;
  font-weight: 700;
  color: var(--text-main);
}

.divider {
  width: 70px;
  height: 4px;
  background-color: var(--accent-yellow);
  margin: 15px auto 0;
  border-radius: 2px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 8%;
  background: var(--card-bg);
  box-shadow: 0 4px 25px var(--shadow-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background-color 0.3s ease;
}

header .logo img {
  height: 55px;
  width: 55px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-color);
  transition: transform 0.3s ease;
}

header nav {
  display: flex;
  align-items: center;
}

header nav a {
  text-decoration: none;
  color: var(--text-main);
  margin-left: 28px;
  font-weight: 600;
  font-size: 15px;
  transition: 0.3s ease;
}

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

.btn-nav {
  background-color: var(--primary-blue);
  color: #ffffff !important;
  padding: 10px 22px;
  border-radius: 6px;
  box-shadow: 0 4px 10px rgba(0, 82, 204, 0.2);
}

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

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-btn, .hamburger-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all 0.3s ease;
}

.hamburger-btn {
  display: none;
}

.theme-btn:hover, .hamburger-btn:hover {
  background: var(--primary-blue);
  color: #ffffff;
  border-color: var(--primary-blue);
}

.lang-switcher {
  display: flex;
  gap: 4px;
  background-color: var(--bg-color);
  padding: 3px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 700;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-btn.active {
  background-color: var(--primary-blue);
  color: #ffffff;
}

#hero {
  background: linear-gradient(135deg, rgba(0, 82, 204, 0.92), rgba(10, 25, 47, 0.96)), url("assets/hero-bg.jpg") no-repeat center center/cover;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #ffffff;
  padding: 60px 20px;
}

.badge {
  background-color: rgba(241, 180, 0, 0.2);
  color: var(--accent-yellow);
  padding: 6px 16px;
  border-radius: 30px;
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 20px;
  border: 1px solid var(--accent-yellow);
}

.hero-content h1 {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero-content p {
  font-size: 18px;
  margin-bottom: 35px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  opacity: 0.9;
}

.hero-buttons {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-main {
  padding: 15px 32px;
  background-color: var(--accent-yellow);
  color: #0a192f;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 700;
  transition: 0.3s ease;
}

.btn-secondary {
  padding: 15px 32px;
  background-color: transparent;
  color: #ffffff;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
  border: 2px solid #ffffff;
  transition: 0.3s ease;
}

#about, #courses, #results, #contact {
  padding: 80px 8%;
}

.about-grid, .course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.about-card {
  padding: 20px;
  text-align: center;
}

.icon-wrapper {
  width: 75px;
  height: 75px;
  background-color: rgba(0, 82, 204, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.about-card i {
  font-size: 32px;
  color: var(--primary-blue);
}

.course-card {
  background: var(--card-bg);
  padding: 35px 25px;
  border-radius: 12px;
  box-shadow: 0 4px 20px var(--shadow-color);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid var(--border-color);
}

.course-tag {
  position: absolute;
  top: 15px;
  right: 20px;
  background-color: rgba(0, 82, 204, 0.12);
  color: var(--primary-blue);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
}

.course-tag.intensiv { background-color: rgba(255, 51, 102, 0.12); color: #ff3366; }
.course-tag.bolalar { background-color: rgba(255, 153, 0, 0.12); color: #ff9900; }

.results-grid {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.result-box {
  background: var(--card-bg);
  padding: 25px 35px;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 15px var(--shadow-color);
  border: 1px solid var(--border-color);
  border-bottom: 4px solid var(--primary-blue);
  min-width: 200px;
  flex: 1;
}

.result-box .score {
  font-size: 38px;
  font-weight: 800;
  color: var(--primary-blue);
}

.social-promo {
  background: var(--card-bg);
  padding: 35px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.social-btn {
  text-decoration: none;
  color: #ffffff;
  padding: 10px 24px;
  border-radius: 6px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.social-btn.tg { background-color: #0088cc; }
.social-btn.insta { background-color: #e1306c; }
.social-btn.yt { background-color: #ff0000; }

.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  max-width: 1100px;
  margin: 0 auto;
}

.contact-form-wrapper {
  background-color: var(--bg-color);
  padding: 30px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.form-group {
  margin-bottom: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group input, .form-group select {
  padding: 12px;
  border: 1.5px solid var(--border-color);
  border-radius: 8px;
  font-size: 15px;
  background-color: var(--card-bg);
  color: var(--text-main);
  outline: none;
}

.form-group select {
  appearance: none;
  background-image: var(--select-arrow);
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 16px;
  padding-right: 40px;
}

.btn-submit {
  width: 100%;
  padding: 14px;
  background-color: var(--primary-blue);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

footer {
  background-color: #0a192f;
  color: #ffffff;
  padding: 35px 8%;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
}

@media (max-width: 992px) {
  header {
    padding: 15px 5%;
  }

  .hamburger-btn {
    display: flex;
  }

  header nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--card-bg);
    flex-direction: column;
    padding: 20px 0;
    box-shadow: 0 10px 20px var(--shadow-color);
    border-top: 1px solid var(--border-color);
    display: none;
  }

  header nav.open {
    display: flex;
  }

  header nav a {
    margin: 12px 0;
    font-size: 16px;
  }
}

@media (max-width: 768px) {
  #hero { min-height: 70vh; }
  .hero-content h1 { font-size: 32px; }
  .hero-content p { font-size: 15px; }
  .contact-container { grid-template-columns: 1fr; }
  #about, #courses, #results, #contact { padding: 60px 5%; }
}

@media (max-width: 480px) {
  .hero-buttons { flex-direction: column; }
  .btn-main, .btn-secondary { width: 100%; text-align: center; }
  .footer-content { flex-direction: column; text-align: center; }
}