/* ============================================
   BASE STYLES — Reset, Typography, Utilities
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  color: var(--color-graphite);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ── Typography ───────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  color: var(--color-blue-deep);
  letter-spacing: var(--tracking-tight);
}

h1 {
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
}

h2 {
  font-size: var(--text-3xl);
}

h3 {
  font-size: var(--text-2xl);
}

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

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

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

p {
  margin-bottom: var(--space-4);
  color: var(--color-gray-dark);
}

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

strong, b {
  font-weight: var(--weight-semibold);
}

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

/* ── Links ────────────────────────────────── */
a {
  color: var(--color-blue-institutional);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-blue-intense);
}

/* ── Images ───────────────────────────────── */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

img[loading="lazy"] {
  opacity: 1;
  transition: opacity var(--transition-slow);
}

/* ── Lists ────────────────────────────────── */
ul, ol {
  list-style: none;
}

/* ── Tables ───────────────────────────────── */
table {
  border-collapse: collapse;
  width: 100%;
}

/* ── Forms ─────────────────────────────────── */
input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* ── Buttons ──────────────────────────────── */
button {
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  color: inherit;
  line-height: inherit;
}

/* ── Focus Styles ─────────────────────────── */
:focus-visible {
  outline: 2px solid var(--color-blue-intense);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

:focus:not(:focus-visible) {
  outline: none;
}

/* ── Selection ────────────────────────────── */
::selection {
  background-color: var(--color-blue-celeste);
  color: var(--color-blue-deep);
}

/* ── Accessibility Utilities ──────────────── */
.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;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  padding: var(--space-2) var(--space-4);
  background: var(--color-blue-institutional);
  color: var(--color-white);
  font-weight: var(--weight-semibold);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  z-index: calc(var(--z-modal) + 1);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
  color: var(--color-white);
}

/* ── Placeholder Content Indicator ────────── */
.placeholder-content {
  position: relative;
  color: var(--color-gray-medium);
  font-style: italic;
  border-left: 3px solid var(--color-blue-celeste);
  padding-left: var(--space-4);
}

/* ── Animations Base ──────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slower), transform var(--transition-slower);
}

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

.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

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

/* Staggered children */
.stagger-children .fade-in:nth-child(1) { transition-delay: 0ms; }
.stagger-children .fade-in:nth-child(2) { transition-delay: 100ms; }
.stagger-children .fade-in:nth-child(3) { transition-delay: 200ms; }
.stagger-children .fade-in:nth-child(4) { transition-delay: 300ms; }
.stagger-children .fade-in:nth-child(5) { transition-delay: 400ms; }
.stagger-children .fade-in:nth-child(6) { transition-delay: 500ms; }
.stagger-children .fade-in:nth-child(7) { transition-delay: 600ms; }
.stagger-children .fade-in:nth-child(8) { transition-delay: 700ms; }