/* ================================
   Global Base Styles
   ================================ */

/* Reset & Base */
* {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
}
html, body {
  margin: 0;
  padding: 0;
  background-color: var(--color-bg);
  color: var(--color-text-main);
  font-family: var(--font-primary);
  font-size: var(--text-size-body);
  line-height: var(--line-height-body);
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover,
a:focus {
  color: var(--color-link-hover);
}
.page-frame {
  max-width: var(--layout-max-width);
  margin: 0 auto;
  padding-left: var(--layout-padding-x);
  padding-right: var(--layout-padding-x);
}

/* Typography */
h1, h2, h3 {
  line-height: var(--line-height-heading);
  letter-spacing: -0.02em;
  font-weight: 700;
}
h1 {
  font-size: var(--text-size-h1);
}
h2 {
  font-size: var(--text-size-h2);
}
h3 {
  font-size: var(--text-size-h3);
}

/* Header */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255,255,255,0.9);
  border-bottom: 1px solid #eaeaea;
  backdrop-filter: blur(8px);
}
header .nav-inner {
  max-width: var(--layout-max-width);
  margin: 0 auto;
  padding: 20px var(--layout-padding-x);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header .brand {
  font-weight: 700;
  font-size: 18px;
}
header nav a {
  margin-left: 20px;
  font-weight: 500;
}
header nav a.active {
  color: var(--color-accent);
}
/* Header effects */
.site-header.scrolled {
  background-color: rgba(255,255,255,0.95);
  box-shadow: 0 4px 16px rgba(0,0,0,0.05);
  transition: all 0.3s ease;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 16px;
  border-radius: var(--radius-button);
  font-weight: 600;
  text-decoration: none;
  transition: background-color var(--transition-fast);
}
.btn-primary {
  background-color: var(--color-accent);
  color: #000;
}
.btn-outline {
  background-color: transparent;
  color: var(--color-text-main);
  border: 1px solid #00000030;
}
.btn-outline:hover {
  border-color: #00000060;
}

/* Section Defaults */
section {
  margin-bottom: var(--section-padding-desktop);
}
@media (max-width: 768px) {
  section {
    margin-bottom: var(--section-padding-mobile);
  }
}

/* Footer */
footer.site-footer {
  background-color: #000;
  color: #fff;
  text-align: center;
  padding: 60px var(--layout-padding-x);
}
footer.site-footer p {
  margin: 8px 0;
  color: #d9d9d9;
}

/* Intersection Observer */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease-out;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}