/* =========================================================
   DERS KULUBU - ANA STIL DOSYASI
   SynExtred Digital Education
========================================================= */

/* RENKLER */

:root {
  --bg: #080720;
  --bg-secondary: #10102e;
  --card: #151533;

  --purple: #9d39ff;
  --blue: #00d5ff;

  --white: #ffffff;
  --text: #e8e8f3;
  --muted: #a5a8c3;

  --border: rgba(255, 255, 255, 0.10);

  --radius: 18px;
  --transition: 0.25s ease;
}

/* =========================================================
   GENEL AYARLAR
========================================================= */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Arial,
    sans-serif;

  background: var(--bg);
  color: var(--text);
  line-height: 1.6;

  min-height: 100vh;
}

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

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 4px;
}

.site-wrapper {
  width: 100%;
  overflow-x: clip;
}

/* =========================================================
   HEADER
========================================================= */

.site-header {
  max-width: 1250px;
  margin: 0 auto;

  padding: 18px 24px;

  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;

  font-weight: 750;
  font-size: 20px;
  color: var(--white);
}

.brand img {
  width: 54px;
  height: 54px;
  object-fit: contain;
  border-radius: 50%;
}

.header-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  min-height: 44px;
  padding: 10px 18px;

  border: 1px solid var(--border);
  border-radius: 12px;

  font-weight: 600;
  font-size: 14px;

  transition:
    background var(--transition),
    border-color var(--transition);
}

.header-link:hover {
  background: rgba(255, 255, 255, 0.10);
  border-color: rgba(157, 57, 255, 0.45);
}

/* =========================================================
   TANITIM
========================================================= */

.intro {
  max-width: 960px;
  margin: 0 auto;

  padding: 75px 24px 85px;
  text-align: center;
}

.status {
  display: inline-block;
  margin-bottom: 26px;

  padding: 9px 18px;

  border: 1px solid rgba(157, 57, 255, 0.35);
  border-radius: 40px;

  background: rgba(157, 57, 255, 0.10);

  color: #d8aaff;

  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
}

.intro h1 {
  font-size: clamp(38px, 5vw, 64px);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 26px;
  color: var(--white);
}

.intro h1 span {
  display: block;

  background: linear-gradient(
    90deg,
    var(--blue),
    #a77aff,
    var(--purple)
  );

  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.intro-text {
  max-width: 780px;
  margin: 0 auto 18px;

  font-size: 18px;
  color: var(--text);
}

.secondary-text {
  color: var(--muted);
}

.button-group {
  margin-top: 34px;

  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
}

/* =========================================================
   BUTONLAR
========================================================= */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  min-height: 48px;
  padding: 15px 26px;

  border-radius: 12px;

  font-size: 15px;
  font-weight: 700;
  text-align: center;

  cursor: pointer;

  transition:
    transform var(--transition),
    box-shadow var(--transition),
    opacity var(--transition);
}

.button:hover {
  transform: translateY(-3px);
}

.button-primary {
  color: var(--white);

  background: linear-gradient(
    110deg,
    #8635ff,
    #b52dff,
    #008eff
  );

  box-shadow:
    0 9px 30px rgba(128, 40, 255, 0.22);
}

.button-primary:hover {
  box-shadow:
    0 12px 35px rgba(128, 40, 255, 0.40);
}

/* =========================================================
   ORTAK BOLUMLER
========================================================= */

.courses,
.apps-section {
  max-width: 1250px;
  margin: 0 auto;
  padding: 65px 24px;
}

.section-heading {
  text-align: center;
  margin-bottom: 42px;
}

.section-heading h2 {
  color: var(--white);
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1.25;
  margin-bottom: 12px;
}

.section-heading p {
  color: var(--muted);
  max-width: 680px;
  margin: 0 auto;
}

/* =========================================================
   DERS KARTLARI
========================================================= */

.course-grid {
  display: grid;

  grid-template-columns:
    repeat(3, minmax(0, 1fr));

  gap: 20px;
}

.course-card {
  position: relative;

  display: flex;
  flex-direction: column;

  background: linear-gradient(
    145deg,
    #171735,
    #101028
  );

  border: 1px solid var(--border);
  border-radius: 20px;

  padding: 30px 24px;

  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.course-card:hover {
  transform: translateY(-5px);

  border-color:
    rgba(157, 57, 255, 0.5);

  box-shadow:
    0 12px 35px rgba(0, 0, 0, 0.18);
}

.course-card.active {
  border-color:
    rgba(0, 213, 255, 0.45);

  background: linear-gradient(
    145deg,
    #19204b,
    #171034
  );
}

.course-icon {
  font-size: 34px;
  margin-bottom: 20px;
}

.course-card h3 {
  color: var(--white);
  font-size: 20px;
  line-height: 1.35;
  margin-bottom: 10px;
}

.course-card p {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 0;
}

.course-status {
  display: inline-block;
  align-self: flex-start;

  margin-top: auto;
  padding-top: 22px;

  color: #b7b7c9;

  font-size: 12px;
  font-weight: 600;
}

.course-status.available {
  color: #37e3ff;
}

/* =========================================================
   MOBIL UYGULAMALAR
========================================================= */

.apps-grid {
  display: grid;

  grid-template-columns:
    repeat(3, minmax(0, 1fr));

  gap: 20px;
}

.app-card {
  display: flex;
  flex-direction: column;
  align-items: center;

  padding: 35px 24px;
  text-align: center;

  background: var(--card);

  border: 1px solid var(--border);
  border-radius: var(--radius);

  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.app-card:hover {
  transform: translateY(-5px);

  border-color:
    rgba(157, 57, 255, 0.45);

  box-shadow:
    0 12px 35px rgba(0, 0, 0, 0.20);
}

.app-card h3 {
  color: var(--white);
  font-size: 23px;
  margin-bottom: 8px;
}

.app-card p {
  color: var(--muted);
  font-size: 14px;
}

/* =========================================================
   APP STORE & GOOGLE PLAY BUTONLARI
========================================================= */

.store-buttons {
  width: 100%;

  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;

  margin-top: auto;
  padding-top: 24px;
}

.store-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  min-height: 44px;
  padding: 11px 18px;

  border-radius: 12px;

  border: 1px solid
    rgba(157, 57, 255, 0.35);

  color: var(--white);

  background:
    rgba(157, 57, 255, 0.12);

  font-size: 14px;
  font-weight: 650;
  text-align: center;

  transition:
    background var(--transition),
    transform var(--transition),
    border-color var(--transition);
}

.store-btn:hover {
  background:
    rgba(157, 57, 255, 0.28);

  border-color:
    rgba(157, 57, 255, 0.65);

  transform: translateY(-2px);
}

.store-btn:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

/* =========================================================
   COK YAKINDA
========================================================= */

.coming-soon {
  max-width: 1100px;
  margin: 70px auto 100px;
  padding: 65px 30px;

  text-align: center;

  background:
    radial-gradient(
      ellipse at top,
      rgba(137, 40, 255, 0.18),
      transparent 70%
    ),
    #11102e;

  border: 1px solid
    rgba(157, 57, 255, 0.25);

  border-radius: 25px;
}

.coming-soon h2 {
  color: var(--white);
  font-size: 40px;
  margin-bottom: 20px;
}

.coming-soon p {
  max-width: 650px;
  margin: 0 auto 28px;

  color: var(--muted);
  font-size: 17px;
}

/* =========================================================
   FOOTER
========================================================= */

.footer {
  padding: 45px 20px;

  text-align: center;

  background: #070619;
  border-top: 1px solid var(--border);
}

.footer-logo {
  width: 80px;
  height: 80px;
  object-fit: contain;

  border-radius: 50%;
  margin: 0 auto 18px;
}

.footer p {
  color: var(--muted);
  font-size: 14px;
}

.footer .copyright {
  margin-top: 12px;
  font-size: 12px;
}

/* =========================================================
   TABLET
========================================================= */

@media (max-width: 900px) {

  .course-grid,
  .apps-grid {
    grid-template-columns:
      repeat(2, minmax(0, 1fr));
  }

  .intro {
    padding-top: 55px;
  }
}

/* =========================================================
   MOBIL
========================================================= */

@media (max-width: 600px) {

  .site-header {
    padding: 14px 16px;
    gap: 10px;
  }

  .brand {
    font-size: 16px;
    gap: 8px;
  }

  .brand img {
    width: 42px;
    height: 42px;
  }

  .header-link {
    font-size: 12px;
    padding: 9px 12px;
  }

  .intro {
    padding: 50px 18px 55px;
  }

  .intro h1 {
    font-size: clamp(32px, 9vw, 37px);
  }

  .intro-text {
    font-size: 16px;
  }

  .status {
    font-size: 10px;
    letter-spacing: 0.4px;
    line-height: 1.5;
  }

  .courses,
  .apps-section {
    padding: 45px 18px;
  }

  .course-grid,
  .apps-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .course-card {
    padding: 25px 20px;
  }

  .app-card {
    padding: 28px 20px;
  }

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

  .store-btn {
    width: 100%;
  }

  .coming-soon {
    margin: 45px 16px 65px;
    padding: 45px 22px;
  }

  .coming-soon h2 {
    font-size: 32px;
  }

  .coming-soon p {
    font-size: 15px;
  }
}

/* =========================================================
   HAREKET HASSASIYETI
========================================================= */

@media (prefers-reduced-motion: reduce) {

  html {
    scroll-behavior: auto;
  }

  .button,
  .header-link,
  .course-card,
  .app-card,
  .store-btn {
    transition: none;
  }

  .button:hover,
  .course-card:hover,
  .app-card:hover,
  .store-btn:hover {
    transform: none;
  }
}