:root {
  --nav-bg: rgba(26, 37, 53, 0.92);
  --nav-height: 64px;
  --accent: #3498db;
  --accent-hover: #2980b9;
  --text: #ffffff;
  --text-muted: rgba(255, 255, 255, 0.65);
  --dark-bg: #1a2535;
  --card-bg: rgba(45, 62, 80, 0.75);
  --border: rgba(255, 255, 255, 0.1);
}

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

/* ─── Navigation ─────────────────────────────────────────── */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 10000;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.nav-brand {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.nav-brand-logo {
  height: 20px;
  width: auto;
  object-fit: contain;
  vertical-align: middle;
  margin-right: 6px;
}

.nav-brand-sub {
  color: #b8f0ff;
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  text-shadow:
    0 0 4px rgba(184, 240, 255, 1),
    0 0 10px rgba(120, 220, 255, 0.85),
    0 0 22px rgba(56, 189, 248, 0.65),
    0 0 42px rgba(14, 165, 233, 0.4);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 6px;
}

.nav-links a {
  color: var(--text);
  text-decoration: none;
  padding: 10px 22px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-family: Arial, Helvetica, sans-serif;
  transition: background 0.18s, color 0.18s;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

.nav-icon {
  font-size: 1rem;
  line-height: 1;
  flex-shrink: 0;
}

.nav-links a:hover {
  background: rgba(255, 255, 255, 0.12);
}

.nav-links a.active {
  background: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  cursor: pointer;
  padding: 7px 12px;
  border-radius: 6px;
  font-size: 1.1rem;
  line-height: 1;
  transition: background 0.18s;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
}

@media (max-width: 640px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(26, 37, 53, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 8px 0 16px;
    border-bottom: 1px solid var(--border);
    gap: 0;
    z-index: 9999;
  }

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

  .nav-links a {
    padding: 17px 28px;
    border-radius: 0;
    font-size: 1rem;
    border-bottom: 1px solid var(--border);
    gap: 12px;
  }

  .nav-links li:last-child a {
    border-bottom: none;
  }
}

/* ─── Page Layout ────────────────────────────────────────── */
.page-body {
  min-height: 100vh;
  background: linear-gradient(155deg, #111b2b 0%, #1a2535 45%, #2d3e50 100%);
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  padding-top: var(--nav-height);
}

.page-header {
  text-align: center;
  padding: 64px 24px 48px;
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: 0.5px;
}

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

.page-header p {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto;
  line-height: 1.7;
}

.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 24px;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 28px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 28px;
  border: 1px solid var(--border);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* ─── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 11px 24px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-family: Arial, Helvetica, sans-serif;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.18s, transform 0.12s;
  border: none;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

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

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.08);
}

/* ─── Footer ─────────────────────────────────────────────── */
.page-footer {
  text-align: center;
  padding: 28px 24px;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 40px;
}

/* ─── Form Elements ──────────────────────────────────────── */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 7px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  font-size: 0.95rem;
  font-family: Arial, Helvetica, sans-serif;
  outline: none;
  transition: border-color 0.18s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
}

.form-group textarea {
  resize: vertical;
  min-height: 130px;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255, 255, 255, 0.3);
}