/* ===== ROOT VARIABLES ===== */
:root {
  --primary: #1a5276;
  --primary-light: #2e86c1;
  --primary-dark: #154360;
  --accent: #f0f4f8;
  --white: #ffffff;
  --text-dark: #1a1a2e;
  --text-mid: #4a4a6a;
  --text-light: #7f8c8d;
  --border: #d6e4f0;
  --shadow: 0 4px 20px rgba(26, 82, 118, 0.1);
  --radius: 8px;
  --font-main: 'Segoe UI', system-ui, sans-serif;
}

/* ===== RESET ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  color: var(--text-dark);
  line-height: 1.6;
  background: var(--white);
}

/* ===== TYPOGRAPHY ===== */
h1 { font-size: 2.8rem; font-weight: 700; line-height: 1.2; }
h2 { font-size: 2rem; font-weight: 600; }
h3 { font-size: 1.3rem; font-weight: 600; }
p  { font-size: 1rem; color: var(--text-mid); }

/* ===== BUTTONS ===== */
.btn-primary {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  padding: 14px 32px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  transition: background 0.3s ease;
}
.btn-primary:hover { background: var(--primary-dark); }

.btn-outline {
  display: inline-block;
  border: 2px solid var(--white);
  color: var(--white);
  padding: 12px 30px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}
.btn-outline:hover {
  background: var(--white);
  color: var(--primary);
}

/* ===== NAVBAR ===== */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: var(--white);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow);
  z-index: 1000;
}
.nav-logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 500;
  transition: color 0.3s;
}
.nav-links a:hover { color: var(--primary); }

/* ===== SECTIONS ===== */
section { padding: 80px 2rem; }
.container { max-width: 1100px; margin: 0 auto; }
.section-title {
  text-align: center;
  margin-bottom: 3rem;
  color: var(--primary-dark);
}
.section-title p {
  margin-top: 0.5rem;
  color: var(--text-light);
}

/* ===== FOOTER ===== */
footer {
  background: var(--primary-dark);
  color: var(--white);
  text-align: center;
  padding: 2rem;
  font-size: 0.9rem;
}
footer a { color: var(--border); text-decoration: none; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  .nav-links { display: none; }
}
/* ===== GALLERY FILTER BUTTONS ===== */
.filter-btn {
  padding: 10px 24px;
  border: 2px solid var(--primary);
  background: white;
  color: var(--primary);
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s ease;
}
.filter-btn:hover,
.filter-btn.active {
  background: var(--primary);
  color: white;
}