/* ═══════════════════════════════════════════════════════════
   BASE STYLES — Reset + Global Defaults
   Uses tokens from tokens.css
   ═══════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: var(--weight-regular);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  color: var(--color-text);
}

h1 { font-size: var(--text-h1); font-weight: var(--weight-bold); }
h2 { font-size: var(--text-h2); font-weight: var(--weight-semibold); }
h3 { font-size: var(--text-h3); font-weight: var(--weight-semibold); }
h4 { font-size: var(--text-h4); font-weight: var(--weight-semibold); }

p {
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 65ch;
}

a {
  color: var(--color-interactive);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-default);
}

a:hover {
  color: var(--color-text);
}

code, pre {
  font-family: var(--font-mono);
  font-size: var(--text-small);
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--gutter-mobile);
  padding-right: var(--gutter-mobile);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--gutter-tablet);
    padding-right: var(--gutter-tablet);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-left: var(--gutter-desktop);
    padding-right: var(--gutter-desktop);
  }
}

/* Section */
.section {
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-3xl);
}

@media (min-width: 768px) {
  .section {
    padding-top: var(--section-padding-y);
    padding-bottom: var(--section-padding-y);
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--btn-font);
  font-weight: var(--btn-weight);
  border-radius: var(--btn-radius);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--duration-fast) var(--ease-default),
              box-shadow var(--duration-fast) var(--ease-default);
  white-space: nowrap;
}

.btn:hover {
  transform: scale(1.03);
}

.btn-primary {
  background: var(--gradient-cta);
  color: white;
  padding: 0.75rem 2rem;
  font-size: 1rem;
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow-lg);
  color: white;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 0.75rem 2rem;
  font-size: 1rem;
}

.btn-secondary:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-glow);
  color: var(--color-text);
}

/* Cards — glass-morphism */
.card {
  background: var(--card-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--card-border);
  border-radius: var(--card-radius);
  padding: var(--card-padding);
  box-shadow: var(--card-shadow);
  transition: border-color var(--duration-fast) var(--ease-default),
              box-shadow var(--duration-fast) var(--ease-default),
              transform var(--duration-fast) var(--ease-default);
}

.card:hover {
  border-color: var(--glass-hover-border);
  box-shadow: var(--glass-hover-shadow);
  transform: scale(1.02);
}

/* Gradient text */
.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Accessibility — focus states */
:focus-visible {
  outline: 2px solid var(--steel-blue);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* Scroll animations */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-normal) var(--ease-default),
              transform var(--duration-normal) var(--ease-default);
}

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