/* ── Custom Properties ── */
:root {
  --navy: #1a2744;
  --navy-light: #2d4a7a;
  --navy-lighter: #3a6098;
  --white: #ffffff;
  --gray-light: #f4f5f7;
  --gray: #6b7280;
  --text: #1f2937;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(26, 39, 68, 0.10);
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 64px; }
body { font-family: var(--font); color: var(--text); line-height: 1.6; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ── Layout ── */
.container { max-width: 800px; margin: 0 auto; padding: 0 1.25rem; }

/* ── Nav ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.nav-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Animations ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.hero h1 {
  animation: fadeUp 0.8s ease-out both;
}

.hero-subtitle {
  animation: fadeUp 0.8s ease-out 0.15s both;
}

.hero .btn {
  animation: fadeUp 0.8s ease-out 0.3s both;
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in:nth-child(1) { transition-delay: 0s; }
.fade-in:nth-child(2) { transition-delay: 0.15s; }

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  color: var(--white);
  text-align: center;
  padding: 6rem 1.25rem 5rem;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.8);
  max-width: 480px;
  margin: 0 auto 2rem;
}

/* ── Buttons ── */
.btn {
  display: inline-block;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(26, 39, 68, 0.15);
}

.btn-primary:hover {
  background: var(--navy-light);
  border-color: var(--navy-light);
}

.btn-secondary {
  background: transparent;
  color: var(--navy);
  border-color: var(--navy);
}

.btn-secondary:hover {
  background: var(--navy);
  color: var(--white);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid var(--white);
}

.btn-outline:hover {
  background: var(--white);
  color: var(--navy);
}

/* ── Profile Sections ── */
.profile {
  padding: 5rem 0;
  background: var(--white);
}

.profile-alt {
  background: var(--gray-light);
}

.profile-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.profile-card:hover {
  box-shadow: 0 8px 30px rgba(26, 39, 68, 0.15);
  transform: translateY(-2px);
}

.profile-alt .profile-card {
  background: var(--white);
}

.profile-header {
  background: var(--navy);
  color: var(--white);
  padding: 2rem 2rem 1.5rem;
}

.profile-header h2 {
  font-size: 1.75rem;
  margin-bottom: 0.25rem;
}

.profile-title {
  color: rgba(255, 255, 255, 0.75);
  font-size: 1rem;
}

.profile-body {
  padding: 2rem;
}

.profile-body > p {
  color: var(--gray);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.profile-body > p:last-of-type {
  margin-bottom: 1.5rem;
}

.profile-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.profile-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.profile-links a {
  color: var(--navy-light);
  font-weight: 500;
  transition: color 0.2s;
}

.profile-links a:hover { color: var(--navy); }

/* ── Footer ── */
.footer {
  background: var(--navy);
  color: var(--white);
  text-align: center;
  padding: 4rem 1.25rem 2rem;
}

.footer h2 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.footer > .container > p {
  color: rgba(255, 255, 255, 0.7);
}

.footer-copy {
  margin-top: 3rem;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ── Mobile ── */
@media (max-width: 640px) {
  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--navy);
    padding: 1rem 1.25rem 1.5rem;
    gap: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  }

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

  .nav-links li { padding: 0.75rem 0; }

  .hero { padding: 4rem 1.25rem 3.5rem; }
  .hero h1 { font-size: 2rem; }

  .profile { padding: 3rem 0; }
  .profile-header { padding: 1.5rem; }
  .profile-body { padding: 1.5rem; }

  .profile-actions { flex-direction: column; }
  .profile-actions .btn { text-align: center; }
}