/* ==================================================
   DESIGN TOKENS
================================================== */
:root {
  --bg-main: linear-gradient(135deg, #ebe9ff, #f7f6ff);
  --glass-bg: rgba(255, 255, 255, 0.28);
  --glass-border: rgba(255, 255, 255, 0.45);
  --glass-shadow: 0 10px 36px rgba(0, 0, 0, 0.12);

  --accent: #7c6cff;
  --accent-soft: rgba(124,108,255,.75);

  --text-main: #1f2937;
  --text-muted: #6b7280;
}

/* ==================================================
   RESET
================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  max-width: 100%;
  overflow-x: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Arial, sans-serif;
  background: var(--bg-main);
  color: var(--text-main);
  line-height: 1.65;
}

/* ==================================================
   HEADER
================================================== */
header {
  max-width: 960px;
  margin: 20px auto 14px;
  padding: 28px 24px;
  text-align: center;

  background: var(--glass-bg);
  backdrop-filter: blur(18px);
  border-radius: 26px;
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

header h1 {
  margin: 0 0 10px;
  font-size: 2rem;
}

header p {
  margin: 0;
  font-size: 1rem;
  color: var(--text-muted);
}

/* ==================================================
   NAVIGATION
================================================== */
nav {
  max-width: 960px;
  margin: 14px auto;
  padding: 14px;
  text-align: center;

  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  border-radius: 22px;
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

nav a {
  display: inline-block;
  margin: 6px 8px;
  padding: 10px 22px;

  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  border-radius: 14px;
  text-decoration: none;
  font-weight: 600;

  transition: transform .25s ease, box-shadow .25s ease;
}

nav a:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(124,108,255,.45);
}

/* ==================================================
   MAIN CONTAINER
================================================== */
main {
  max-width: 960px;
  margin: 20px auto;
  padding: 26px;

  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-radius: 28px;
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

/* ==================================================
   TYPOGRAPHY
================================================== */
h2 {
  margin: 32px 0 14px;
  font-size: 1.55rem;
  color: var(--accent);
  border-left: 4px solid var(--accent);
  padding-left: 14px;
}

h3 {
  margin: 24px 0 10px;
  font-size: 1.25rem;
  color: var(--accent);
}

p {
  margin: 0 0 14px;
}

ul, ol {
  padding-left: 20px;
  margin: 0 0 18px;
}

li {
  margin-bottom: 8px;
}

/* ==================================================
   LINKS
================================================== */
a {
  color: var(--accent);
}

a:hover {
  text-decoration: underline;
}

/* ==================================================
   COURSE CARDS
================================================== */
.course {
  margin: 22px 0;
  padding: 24px;

  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  border-radius: 24px;
  border: 1px solid var(--glass-border);
  box-shadow: 0 10px 30px rgba(0,0,0,0.12);

  transition: transform .3s ease;
}

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

/* ==================================================
   IMAGES
================================================== */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

.school-image {
  width: 100%;
  margin: 18px 0;
  border-radius: 18px;
  box-shadow: 0 14px 32px rgba(0,0,0,0.15);
}

/* ==================================================
   BUTTONS
================================================== */
.btn {
  display: inline-block;
  margin-top: 16px;
  padding: 12px 28px;

  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.45);
  text-decoration: none;
  font-weight: 600;

  transition: transform .25s ease, box-shadow .25s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(124,108,255,.45);
}

/* ==================================================
   TABLE (ROUNDED HEADER)
================================================== */
.responsive-table {
  width: 100%;
  margin-top: 20px;

  border-collapse: separate;
  border-spacing: 0;

  background: var(--glass-bg);
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.responsive-table th,
.responsive-table td {
  padding: 14px;
  text-align: left;
}

.responsive-table thead th {
  background: rgba(124,108,255,.35);
  color: #fff;
  font-weight: 600;
}

.responsive-table thead th:first-child {
  border-top-left-radius: 22px;
}

.responsive-table thead th:last-child {
  border-top-right-radius: 22px;
}

.responsive-table tbody tr:nth-child(odd) {
  background: rgba(255,255,255,.18);
}

/* ==================================================
   FOOTER
================================================== */
footer {
  max-width: 960px;
  margin: 20px auto;
  padding: 20px;

  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  border-radius: 22px;
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);

  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

/* ==================================================
   MOBILE
================================================== */
@media (max-width: 768px) {

  header h1 {
    font-size: 1.65rem;
  }

  header,
  nav,
  main,
  footer {
    margin: 12px;
  }

  main {
    padding: 22px;
  }

  .responsive-table,
  .responsive-table thead,
  .responsive-table tbody,
  .responsive-table tr,
  .responsive-table td {
    display: block;
    width: 100%;
  }

  .responsive-table thead {
    display: none;
  }

  .responsive-table tr {
    margin-bottom: 16px;
    padding: 16px;
    background: var(--glass-bg);
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
  }

  .responsive-table td {
    padding: 8px 0;
  }
}