/* Reset & box-sizing */
* {
  box-sizing: border-box;
}

/* Page base */
html, body {
  height: 100%;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, 'Helvetica Neue', Arial;
  background: #0f172a;
  color: #e2e8f0;
  padding: 18px;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

/* Layout container */
.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 18px;
}

/* Navigation */
nav {
  text-align: center;
  margin-bottom: 20px;
}

nav a {
  color: #c7f9d2;
  text-decoration: none;
  margin: 0 8px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 8px;
  transition: background 0.18s ease, transform 0.12s ease;
}

nav a:hover {
  background: rgba(34,197,94,0.08);
  transform: translateY(-1px);
}

/* Headings */
h1 {
  text-align: center;
  margin-bottom: 18px;
  font-weight: 700;
  color: #f8fafc;
  font-size: 1.6rem;
}

h2 {
  margin-top: 16px;
  margin-bottom: 10px;
  font-weight: 600;
  color: #e6eef8;
  font-size: 1.1rem;
}

/* Content cards / sections */
.section, #courses {
  background: linear-gradient(180deg, rgba(30,41,59,0.9), rgba(30,41,59,0.85));
  padding: 18px;
  border-radius: 12px;
  margin-top: 14px;
  margin-bottom: 20px;
  border: 1px solid rgba(255,255,255,0.04);
}

/* Paragraphs inside container */
.container p {
  color: #cbd5e1;
  line-height: 1.6;
  margin-top: 10px;
  font-size: 0.98rem;
}

.container p + p {
  margin-top: 12px;
}

.contact-email {
  display: inline-block;
  margin-top: 8px;
  padding: 6px 10px;
  background: rgba(255,255,255,0.03);
  border-radius: 8px;
  color: #e6fff0;
  font-weight: 600;
}

/* Form and inputs (used by index but kept here) */
.course {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 10px;
  margin-bottom: 10px;
}

input, select, textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid #334155;
  background: #0b1220;
  color: #e2e8f0;
  font-size: 14px;
  transition: all 0.16s ease;
}

input::placeholder, textarea::placeholder {
  color: #64748b;
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg fill='%23e2e8f0' height='20' viewBox='0 0 20 20' width='20'><path d='M5 7l5 5 5-5z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 16px;
  padding-right: 36px;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: #22c55e;
  box-shadow: 0 0 0 3px rgba(34,197,94,0.12);
}

button {
  padding: 10px 14px;
  border-radius: 8px;
  border: none;
  background: #22c55e;
  color: #022c22;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  background: #16a34a;
  transform: translateY(-1px);
}

.danger {
  background: #ef4444;
  color: white;
}

.result {
  margin-top: 15px;
  font-size: 20px;
  text-align: center;
  font-weight: 700;
  color: #22c55e;
}

/* Responsive */
@media (max-width: 760px) {
  .course {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 14px;
  }
}