/* ============================================================
   BASE STYLES — Reset, globals, typography (AIWork-Inspired)
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: var(--weight-regular);
  line-height: var(--leading-relaxed);
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
input, textarea { font: inherit; color: inherit; }

/* --- Focus ring --- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* --- Selection --- */
::selection {
  background: var(--color-purple-20);
  color: var(--color-text);
}

/* --- Headings --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: var(--weight-bold);
  color: var(--color-text);
  letter-spacing: -0.025em;
}

h1 {
  font-size: var(--text-4xl);
  line-height: var(--leading-tight);
  letter-spacing: -0.03em;
  font-weight: var(--weight-extrabold);
}

h2 {
  font-size: var(--text-3xl);
  line-height: var(--leading-snug);
  letter-spacing: -0.025em;
  font-weight: var(--weight-bold);
}

h3 {
  font-size: var(--text-2xl);
  line-height: var(--leading-snug);
  letter-spacing: -0.02em;
}

h4 {
  font-size: var(--text-lg);
  line-height: var(--leading-normal);
  letter-spacing: -0.01em;
}

@media (min-width: 768px) {
  h1 { font-size: var(--text-6xl); }
  h2 { font-size: var(--text-5xl); }
  h3 { font-size: var(--text-3xl); }
}

@media (min-width: 1024px) {
  h1 { font-size: var(--text-7xl); }
}

/* --- Paragraphs --- */
p {
  color: var(--color-text-muted);
}

.text-subtle {
  color: var(--color-text-subtle);
  font-size: var(--text-sm);
}

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

.gradient-text-blue {
  background: var(--gradient-blue);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
}

/* --- Mono text utility --- */
.mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
  letter-spacing: 0;
}

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

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 640px) {
  .container { padding-left: var(--space-6); padding-right: var(--space-6); }
}
@media (min-width: 1024px) {
  .container { padding-left: var(--space-8); padding-right: var(--space-8); }
}

/* --- Container wide variant --- */
.container-wide {
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 640px) {
  .container-wide { padding-left: var(--space-6); padding-right: var(--space-6); }
}
@media (min-width: 1024px) {
  .container-wide { padding-left: var(--space-8); padding-right: var(--space-8); }
}

/* --- Section spacing --- */
.section {
  padding-top: var(--space-20);
  padding-bottom: var(--space-20);
}

@media (min-width: 768px) {
  .section {
    padding-top: var(--space-32);
    padding-bottom: var(--space-32);
  }
}

/* --- Section headers --- */
.section-header {
  text-align: center;
  max-width: var(--max-w-md);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-16);
}

.section-header h2 {
  margin-bottom: var(--space-4);
}

.section-header p {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 36rem;
  margin-left: auto;
  margin-right: auto;
  margin-top: var(--space-4);
}

/* Section label (eyebrow text) */
.section-label {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
  display: block;
}

/* --- Utility: screen-reader only --- */
.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;
}

/* --- Grid helpers --- */
.grid-2 { display: grid; gap: var(--space-6); }
.grid-3 { display: grid; gap: var(--space-6); }
.grid-4 { display: grid; gap: var(--space-6); }

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

@media (min-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* --- Bento grid (2×2 and mixed) --- */
.bento-grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .bento-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .bento-grid { grid-template-columns: repeat(4, 1fr); }
  .bento-wide { grid-column: span 2; }
}