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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--color-bg-main);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-title);
  color: var(--color-brand);
  line-height: 1.25;
  font-weight: 500;
}

h1 {
  font-size: 3rem;
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: 2.25rem;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: var(--spacing-lg);
  text-align: center;
  position: relative;
  display: block;
}

h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-md);
  font-weight: 400;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Structural Components */
.container {
  width: 90%;
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding-left: var(--spacing-sm);
  padding-right: var(--spacing-sm);
}

section {
  padding: var(--spacing-xxl) 0;
  position: relative;
}

@media (max-width: 768px) {
  section {
    padding: var(--spacing-xl) 0;
  }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-main);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bg-dark);
  border-radius: var(--border-radius-pill);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-brand);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.8rem;
  border-radius: var(--border-radius-pill);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 2px solid transparent;
  gap: 0.5rem;
}

.btn-primary {
  background-color: var(--color-brand);
  color: var(--color-bg-light);
}

.btn-primary:hover {
  background-color: var(--color-brand-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

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

.btn-secondary:hover {
  background-color: var(--color-brand);
  color: var(--color-bg-light);
  transform: translateY(-2px);
}

/* Scroll Animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Utilities */
.text-center {
  text-align: center;
}
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }