/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #1a56db;
  --primary-dark: #1442a8;
  --accent: #06b6d4;
  --dark: #0f172a;
  --gray-900: #1e293b;
  --gray-700: #374151;
  --gray-400: #9ca3af;
  --gray-200: #e5e7eb;
  --gray-100: #f3f4f6;
  --white: #ffffff;
  --error: #dc2626;
  --success: #16a34a;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--gray-900);
  line-height: 1.6;
  background: var(--white);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3 {
  line-height: 1.2;
}

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

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  z-index: 1000;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--dark);
}

.logo span {
  color: var(--primary);
}

.nav-links {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--gray-700);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--primary);
}

.btn-nav {
  background: var(--primary);
  color: var(--white) !important;
  padding: 8px 20px;
  border-radius: 6px;
  transition: background 0.2s;
}

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

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--dark);
}

/* ===== Hero ===== */
.hero {
  padding: 140px 0 100px;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%);
  color: var(--white);
  text-align: center;
}

.hero-content {
  max-width: 720px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 20px;
}

.hero h1 span {
  color: var(--accent);
}

.hero p {
  font-size: 1.15rem;
  color: var(--gray-400);
  margin-bottom: 36px;
}

.btn-primary {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  padding: 14px 36px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

/* ===== Courses ===== */
.courses {
  padding: 100px 0;
  text-align: center;
}

.courses h2 {
  font-size: 2rem;
  margin-bottom: 8px;
}

.section-subtitle {
  color: var(--gray-700);
  margin-bottom: 48px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: 36px 28px;
  text-align: left;
  transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  transform: translateY(-4px);
}

.card-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.card h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
  color: var(--dark);
}

.card p {
  color: var(--gray-700);
  font-size: 0.95rem;
}

/* ===== Audience ===== */
.audience {
  padding: 100px 0;
  background: var(--gray-100);
  text-align: center;
}

.audience h2 {
  font-size: 2rem;
  margin-bottom: 48px;
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.audience-card {
  background: var(--white);
  border-radius: 12px;
  padding: 40px 32px;
  text-align: left;
  border-left: 4px solid var(--primary);
}

.audience-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  color: var(--dark);
}

.audience-card p {
  color: var(--gray-700);
  font-size: 0.95rem;
}

/* ===== Enquiry Form ===== */
.enquiry {
  padding: 100px 0;
  text-align: center;
}

.enquiry h2 {
  font-size: 2rem;
  margin-bottom: 8px;
}

.enquiry-form {
  max-width: 600px;
  margin: 0 auto;
  text-align: left;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--dark);
}

.form-group input {
  padding: 12px 14px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12);
}

.form-group input.invalid {
  border-color: var(--error);
}

.form-group-full {
  margin-bottom: 20px;
}

.form-group textarea {
  padding: 12px 14px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  resize: vertical;
  transition: border-color 0.2s;
}

.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12);
}

.char-count {
  font-size: 0.8rem;
  color: var(--gray-400);
  text-align: right;
  margin-top: 4px;
}

.error-msg {
  font-size: 0.8rem;
  color: var(--error);
  min-height: 20px;
  margin-top: 4px;
}

.btn-submit {
  width: 100%;
  margin-top: 8px;
}

.btn-submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.form-success {
  max-width: 600px;
  margin: 32px auto 0;
  padding: 20px;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 8px;
  color: var(--success);
  font-weight: 600;
}

.form-error {
  max-width: 600px;
  margin: 16px auto 0;
  padding: 20px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 8px;
  color: var(--error);
  font-weight: 600;
}

.hidden {
  display: none;
}

/* ===== Footer ===== */
.footer {
  padding: 28px 0;
  background: var(--dark);
  color: var(--gray-400);
  text-align: center;
  font-size: 0.9rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background: var(--white);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--gray-200);
  }

  .nav-links.active {
    display: flex;
  }

  .mobile-toggle {
    display: block;
  }

  .hero {
    padding: 120px 0 80px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .audience-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 12px;
  }
}