/* ============================================================
   BASE.CSS — Reset, Global Defaults, Typography
   ============================================================ */

/* ── Modern 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-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-surface);
  overflow-x: hidden;
  min-height: 100vh;
}

/* ── Typography ── */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-navy);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

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

a {
  color: var(--color-teal);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-teal-dark);
}

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

ul,
ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
}

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
}

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

.text-gradient {
  background: linear-gradient(135deg, var(--color-teal-light), var(--color-orange));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.accent-bar {
  width: 60px;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--gradient-teal);
  margin-bottom: var(--space-6);
}

.accent-bar--center {
  margin-left: auto;
  margin-right: auto;
}

/* ── Selection ── */
::selection {
  background-color: var(--color-teal);
  color: var(--color-white);
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-surface-alt);
}

::-webkit-scrollbar-thumb {
  background: var(--color-teal);
  border-radius: var(--radius-full);
}

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

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

/* ── Animations ── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-40px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(40px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.05); }
}

@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-up { animation: fadeInUp 0.8s ease forwards; }
.fade-in    { animation: fadeIn 0.8s ease forwards; }

.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }

/* ── Dark Mode Headings ── */
html[data-theme="dark"] h1,
html[data-theme="dark"] h2,
html[data-theme="dark"] h3,
html[data-theme="dark"] h4,
html[data-theme="dark"] h5,
html[data-theme="dark"] h6 {
  color: var(--color-text);
}

/* Always-dark sections keep white headings in both themes */
.section--dark h2,
.section--dark h3,
.section--dark h4,
.section--gradient h2,
.section--gradient h3,
.page-header h1,
.cta-section h2,
.cta-section h3 {
  color: var(--color-white);
}