/* ============================================
   BASE STYLES
   Reset, typography, layout, utilities
   ============================================ */

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

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-normal);
  line-height: var(--leading-relaxed);
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: hidden;
  min-height: 100vh;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

h1 {
  font-size: clamp(var(--text-5xl), 8vw, var(--text-7xl));
  letter-spacing: var(--tracking-tight);
}

h2 {
  font-size: clamp(var(--text-3xl), 5vw, var(--text-5xl));
  letter-spacing: var(--tracking-tight);
}

h3 {
  font-size: clamp(var(--text-2xl), 3vw, var(--text-3xl));
}

h4 {
  font-size: var(--text-xl);
}

h5 {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
}

h6 {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
}

p {
  margin-bottom: var(--space-5);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

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

strong, b {
  font-weight: var(--weight-bold);
  color: var(--text-primary);
}

em {
  color: var(--accent);
}

small {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

ul, ol {
  list-style: none;
}

img, picture, video, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

img {
  border-style: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: 100%;
  line-height: inherit;
  margin: 0;
}

button, [type='button'], [type='submit'] {
  -webkit-appearance: button;
  cursor: pointer;
}

button:disabled, [disabled] {
  cursor: not-allowed;
  opacity: 0.5;
}

input, textarea, select {
  outline: none;
}

textarea {
  resize: vertical;
}

/* ===== LAYOUT ===== */
.container {
  width: 100%;
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

.container-narrow {
  width: 100%;
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

.container-wide {
  width: 100%;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

/* ===== SECTIONS ===== */
.section {
  padding: var(--space-24) 0;
  position: relative;
}

.section-dark {
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  max-width: var(--max-width-narrow);
  margin: 0 auto var(--space-16);
}

.section-tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--accent);
  margin-bottom: var(--space-4);
}

.section-title {
  margin-bottom: var(--space-4);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== GRID ===== */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* ===== SCROLL ANIMATIONS ===== */
[data-reveal] {
  opacity: 0;
  transition:
    opacity 0.6s var(--ease-out),
    transform 0.6s var(--ease-out);
}

[data-reveal].revealed {
  opacity: 1;
  transform: none;
}

[data-reveal="fade-up"] {
  transform: translateY(30px);
}

[data-reveal="fade-in"] {
  transform: none;
}

[data-reveal="scale-up"] {
  transform: scale(0.95);
}

/* Stagger delay */
[data-reveal]:not(.revealed)[style*="--delay"] {
  transition-delay: var(--delay);
}

/* ===== ACCESSIBILITY ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

::selection {
  background-color: var(--accent);
  color: var(--text-primary);
}

/* ===== SCROLLBAR ===== */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--text-muted) var(--bg-tertiary);
}

::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: var(--radius-full);
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .section {
    padding: var(--space-16) 0;
  }

  .section-header {
    margin-bottom: var(--space-10);
  }

  .container, .container-narrow, .container-wide {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
}

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