:root {
    --ink: #0a1628;
    --deep: #071020;
    --teal: #00c4a7;
    --teal-dim: #009e86;
    --amber: #f5a623;
    --slate: #1e3a5f;
    --slate-light: #2b5180;
    --mist: #e8f4f0;
    --white: #f9fbfc;
    --gray: #8fa8c0;
    --mono: 'Space Mono', monospace;
    --sans: 'Sora', sans-serif;
  }

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

  html { scroll-behavior: smooth; }

  body {
    background: var(--deep);
    color: var(--white);
    font-family: var(--sans);
    overflow-x: hidden;
  }

  /* -- NAV -- */
  nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 999;
    display: flex; align-items: center; justify-content: space-between;
    padding: 1rem 4rem;
    background: rgba(7,16,32,0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,196,167,0.15);
  }
  .nav-logo {
    font-family: var(--mono);
    font-size: 1.1rem;
    color: var(--teal);
    text-decoration: none;
    letter-spacing: 0.08em;
  }
  .nav-logo span { color: var(--white); }
  .nav-links { display: flex; gap: 2rem; list-style: none; }
  .nav-links a {
    color: var(--gray);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    transition: color 0.2s;
  }
  .nav-links a:hover { color: var(--teal); }
  .nav-cta {
    background: var(--teal);
    color: var(--deep) !important;
    padding: 0.5rem 1.2rem;
    border-radius: 4px;
    font-weight: 700 !important;
  }
  .nav-cta:hover { background: var(--teal-dim) !important; color: var(--white) !important; }

  /* -- HERO -- */
  .hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
    padding: 8rem 4rem 4rem;
    gap: 2rem;
    position: relative;
    overflow: hidden;
  }
  .hero::before {
    content: '';
    position: absolute; inset: 0;
    background:
      radial-gradient(ellipse 60% 80% at 100% 50%, rgba(0,196,167,0.08) 0%, transparent 70%),
      radial-gradient(ellipse 40% 60% at 10% 80%, rgba(30,58,95,0.6) 0%, transparent 60%);
    pointer-events: none;
  }
  .hero-grid-bg {
    position: absolute; inset: 0;
    background-image:
      linear-gradient(rgba(0,196,167,0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(0,196,167,0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
  }
  .hero-tag {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--teal);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    display: flex; align-items: center; gap: 0.75rem;
  }
  .hero-tag::before {
    content: '';
    display: inline-block; width: 2rem; height: 1px;
    background: var(--teal);
  }
  .hero h1 {
    font-family: var(--sans);
    font-size: clamp(2.8rem, 5vw, 4.5rem);
    font-weight: 800;
    line-height: 1.05;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
  }
  .hero h1 em {
    font-style: normal;
    color: var(--teal);
  }
  .hero p {
    font-size: 1.1rem;
    color: var(--gray);
    line-height: 1.8;
    max-width: 480px;
    margin-bottom: 2.5rem;
  }
  .hero-btns { display: flex; gap: 1rem; flex-wrap: wrap; }
  .btn-primary {
    display: inline-block;
    background: var(--teal);
    color: var(--deep);
    font-family: var(--sans);
    font-weight: 700;
    font-size: 0.9rem;
    padding: 0.9rem 2rem;
    border-radius: 4px;
    text-decoration: none;
    letter-spacing: 0.05em;
    transition: all 0.25s;
  }
  .btn-primary:hover { background: var(--teal-dim); transform: translateY(-2px); }
  .btn-outline {
    display: inline-block;
    border: 1px solid rgba(0,196,167,0.4);
    color: var(--teal);
    font-family: var(--sans);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 0.9rem 2rem;
    border-radius: 4px;
    text-decoration: none;
    transition: all 0.25s;
  }
  .btn-outline:hover { border-color: var(--teal); background: rgba(0,196,167,0.08); }

  /* Hero right: animated map */
  .hero-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 500px;
    width: 100%;
    align-self: stretch;
    min-width: 0;
  }
  .map-frame {
    width: 100%;
    height: 100%;
    border: 1px solid rgba(0,196,167,0.2);
    border-radius: 8px;
    position: relative;
    overflow: hidden;
    background: #081828;
  }
  .map-photo {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    object-position: center;
  }
  .map-overlay {
    position: absolute; top: 1rem; right: 1rem;
    background: rgba(7,16,32,0.9);
    border: 1px solid rgba(0,196,167,0.3);
    border-radius: 6px;
    padding: 0.75rem 1rem;
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--teal);
  }
  .map-overlay div { margin-bottom: 0.3rem; }
  .map-overlay span { color: var(--white); }

  .pulse-dot {
    position: absolute;
    width: 12px; height: 12px;
    border-radius: 50%;
    background: var(--teal);
    animation: pulse 2s infinite;
  }
  .pulse-dot::after {
    content: '';
    position: absolute;
    inset: -6px;
    border-radius: 50%;
    border: 2px solid var(--teal);
    animation: ripple 2s infinite;
  }
  @keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.6} }
  @keyframes ripple { 0%{transform:scale(1);opacity:0.8} 100%{transform:scale(2.5);opacity:0} }

  /* -- STATS -- */
  .stats {
    display: grid; grid-template-columns: repeat(4,1fr);
    gap: 1px;
    background: rgba(0,196,167,0.1);
    border-top: 1px solid rgba(0,196,167,0.1);
    border-bottom: 1px solid rgba(0,196,167,0.1);
  }
  .stat-item {
    background: var(--deep);
    padding: 2.5rem 2rem;
    text-align: center;
  }
  .stat-num {
    font-family: var(--mono);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--teal);
    display: block;
    margin-bottom: 0.4rem;
  }
  .stat-label {
    font-size: 0.8rem;
    color: var(--gray);
    letter-spacing: 0.1em;
    text-transform: uppercase;
  }

  /* -- SECTION COMMONS -- */
  section { padding: 6rem 4rem; }
  .section-tag {
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--teal);
    letter-spacing: 0.25em;
    text-transform: uppercase;
    margin-bottom: 1rem;
    display: flex; align-items: center; gap: 0.75rem;
  }
  .section-tag::before {
    content: '';
    display: inline-block; width: 2rem; height: 1px;
    background: var(--teal);
  }
  .section-title {
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    line-height: 1.15;
  }
  .section-title em { font-style: normal; color: var(--teal); }
  .section-sub {
    color: var(--gray);
    font-size: 1rem;
    line-height: 1.8;
    max-width: 560px;
    margin-bottom: 3rem;
  }

  /* -- ABOUT -- */
  #about { background: var(--ink); }
  .about-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 5rem;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
  }
  .about-photo {
    position: relative;
  }
  .about-photo-frame {
    width: 100%;
    aspect-ratio: 3/4;
    background: linear-gradient(135deg, var(--slate) 0%, var(--slate-light) 100%);
    border-radius: 4px;
    position: relative;
    overflow: hidden;
    display: flex; align-items: center; justify-content: center;
  }
  .about-photo-frame svg {
    width: 60%;
    opacity: 0.25;
  }
  .about-photo-corner {
    position: absolute;
    bottom: -1rem; right: -1rem;
    width: 120px; height: 120px;
    border-right: 2px solid var(--teal);
    border-bottom: 2px solid var(--teal);
    border-radius: 0 0 4px 0;
  }
  .about-photo-label {
    position: absolute;
    bottom: 1.5rem; left: 1.5rem;
    background: rgba(7,16,32,0.9);
    border: 1px solid rgba(0,196,167,0.3);
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--teal);
  }
  .about-content {}
  .about-content p {
    color: var(--gray);
    line-height: 1.9;
    margin-bottom: 1.2rem;
    font-size: 0.95rem;
  }
  .about-tags {
    display: flex; flex-wrap: wrap; gap: 0.5rem;
    margin: 1.5rem 0;
  }
  .tag {
    background: rgba(0,196,167,0.08);
    border: 1px solid rgba(0,196,167,0.25);
    color: var(--teal);
    padding: 0.3rem 0.8rem;
    border-radius: 3px;
    font-size: 0.78rem;
    font-family: var(--mono);
    letter-spacing: 0.05em;
  }
  .social-links {
    display: flex; gap: 1rem; margin-top: 2rem;
  }
  .social-link {
    display: flex; align-items: center; gap: 0.5rem;
    color: var(--gray);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    transition: color 0.2s;
    border: 1px solid rgba(255,255,255,0.1);
    padding: 0.5rem 1rem;
    border-radius: 4px;
  }
  .social-link:hover { color: var(--teal); border-color: rgba(0,196,167,0.3); }
  .social-link svg { width: 16px; height: 16px; fill: currentColor; }

  /* -- TOP COURSES -- */
  #top-courses { background: var(--deep); }
  .top-courses-header {
    max-width: 1100px; margin: 0 auto 3rem;
    display: flex; justify-content: space-between; align-items: flex-end;
  }
  .courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 1100px;
    margin: 0 auto;
  }
  .course-card {
    background: var(--ink);
    border: 1px solid rgba(0,196,167,0.1);
    border-radius: 6px;
    overflow: visible;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    position: relative;
  }
  .course-card:hover {
    border-color: rgba(0,196,167,0.4);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,196,167,0.1);
  }
  .course-card.featured {
    border-color: rgba(0,196,167,0.35);
  }
  .course-badge {
    position: absolute; top: 1rem; right: 1rem;
    background: var(--teal);
    color: var(--deep);
    font-family: var(--mono);
    font-size: 0.65rem;
    font-weight: 700;
    padding: 0.25rem 0.6rem;
    border-radius: 3px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
  }
  .course-thumb {
    width: 100%; height: 180px;
    position: relative;
    overflow: hidden;
  }
  .course-thumb-bg {
    width: 100%; height: 100%;
    display: flex; align-items: center; justify-content: center;
    font-size: 4rem;
    position: relative;
  }
  .course-thumb-bg::after {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(to bottom, transparent 50%, rgba(10,22,40,0.9) 100%);
  }
  .thumb-c1 { background: linear-gradient(135deg, #0a2a4a 0%, #1e5080 100%); }
  .thumb-c2 { background: linear-gradient(135deg, #0a3020 0%, #1a6040 100%); }
  .thumb-c3 { background: linear-gradient(135deg, #2a1a0a 0%, #5a3010 100%); }
  .course-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; }
  .course-level {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--gray);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
  }
  .course-title {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 0.75rem;
    color: var(--white);
  }
  .course-desc {
    font-size: 0.85rem;
    color: var(--gray);
    line-height: 1.7;
    flex: 1;
    margin-bottom: 1rem;
  }
  .course-meta {
  display: flex;
  flex-wrap: wrap;          /* ← bunu ekle */
  gap: 0.4rem 0.75rem;      /* ← bunu ekle */
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid rgba(255,255,255,0.07);
}
  .course-price {
    font-family: var(--mono);
    font-size: 1.1rem;
    color: var(--teal);
    font-weight: 700;
  }
  .course-students {
    font-size: 0.78rem;
    color: var(--gray);
  }
  .course-rating {
    display: flex; align-items: center; gap: 0.3rem;
    font-size: 0.82rem;
    color: var(--amber);
  }

  /* -- ALL COURSES -- */
  #courses { background: var(--ink); }
  .all-courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    max-width: 1100px;
    margin: 0 auto;
  }

  /* -- SERVICES -- */
  #services { background: var(--deep); }
  .services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 1100px; margin: 0 auto;
  }
  .service-card {
    background: var(--ink);
    border: 1px solid rgba(0,196,167,0.1);
    border-radius: 6px;
    padding: 2rem;
    transition: border-color 0.3s;
  }
  .service-card:hover { border-color: rgba(0,196,167,0.35); }
  .service-icon {
    width: 48px; height: 48px;
    background: rgba(0,196,167,0.1);
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.2rem;
  }
  .service-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--white);
  }
  .service-desc {
    font-size: 0.875rem;
    color: var(--gray);
    line-height: 1.75;
  }

  /* -- CONTACT -- */
  #contact { background: var(--ink); }
  .contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 5rem;
    max-width: 1100px; margin: 0 auto;
  }
  .contact-info p {
    color: var(--gray);
    line-height: 1.8;
    margin-bottom: 2rem;
    font-size: 0.95rem;
  }
  .contact-item {
    display: flex; align-items: flex-start; gap: 1rem;
    margin-bottom: 1.2rem;
  }
  .contact-item-icon {
    width: 36px; height: 36px;
    background: rgba(0,196,167,0.1);
    border-radius: 6px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
  }
  .contact-item-text {
    font-size: 0.875rem;
    color: var(--gray);
    line-height: 1.6;
  }
  .contact-item-text strong {
    color: var(--white);
    display: block;
    margin-bottom: 0.2rem;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }
  .contact-form { display: flex; flex-direction: column; gap: 1rem; }
  .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
  .form-group { display: flex; flex-direction: column; gap: 0.4rem; }
  .form-group label {
    font-size: 0.75rem;
    font-family: var(--mono);
    color: var(--gray);
    letter-spacing: 0.1em;
    text-transform: uppercase;
  }
  .form-group input,
  .form-group textarea,
  .form-group select {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 4px;
    color: var(--white);
    font-family: var(--sans);
    font-size: 0.9rem;
    padding: 0.75rem 1rem;
    outline: none;
    transition: border-color 0.2s;
  }
  .form-group input:focus,
  .form-group textarea:focus,
  .form-group select:focus {
    border-color: var(--teal);
  }
  .form-group textarea { resize: vertical; min-height: 130px; }
  .form-group select option { background: var(--ink); }

  /* -- FOOTER -- */
  footer {
    background: var(--deep);
    border-top: 1px solid rgba(0,196,167,0.1);
    padding: 3rem 4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
  }
  .footer-logo {
    font-family: var(--mono);
    color: var(--teal);
    font-size: 1rem;
    text-decoration: none;
  }
  .footer-copy {
    color: var(--gray);
    font-size: 0.8rem;
  }
  .footer-links { display: flex; gap: 1.5rem; }
  .footer-links a {
    color: var(--gray);
    text-decoration: none;
    font-size: 0.8rem;
    transition: color 0.2s;
  }
  .footer-links a:hover { color: var(--teal); }

  /* -- ANIMATIONS -- */
  @keyframes floatIn {
    from { opacity:0; transform: translateY(30px); }
    to { opacity:1; transform: translateY(0); }
  }
  .hero-left > * {
    animation: floatIn 0.7s ease both;
  }
  .hero-left > *:nth-child(1) { animation-delay: 0.1s; }
  .hero-left > *:nth-child(2) { animation-delay: 0.25s; }
  .hero-left > *:nth-child(3) { animation-delay: 0.4s; }
  .hero-left > *:nth-child(4) { animation-delay: 0.55s; }
  .hero-visual { animation: floatIn 0.9s ease 0.4s both; }

  @media (max-width: 900px) {
    nav { padding: 1rem 2rem; }
    .nav-links { display: none; }
    .hero { grid-template-columns: 1fr; padding: 6rem 2rem 3rem; }
    .hero-visual { display: none; }
    section { padding: 4rem 2rem; }
    .courses-grid, .services-grid { grid-template-columns: 1fr; }
    .about-grid, .contact-grid { grid-template-columns: 1fr; }
    .stats { grid-template-columns: 1fr 1fr; }
    footer { flex-direction: column; align-items: flex-start; padding: 2rem; }
    .top-courses-header { flex-direction: column; align-items: flex-start; gap: 1rem; }
  }