/* ==========================================================================
   Base — resets, global typography, layout primitives, utility classes
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--text-primary);
  background-color: var(--bg-body);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

/* Respect reduced-motion preference across the whole site */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

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

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

ul,
ol {
  padding: 0;
}

button {
  font-family: inherit;
}

::selection {
  background: var(--color-purple);
  color: #fff;
}

/* ---- Focus visibility (accessibility) ---- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 3000;
  background: var(--color-blue);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus {
  left: 0;
}

/* ---- Headings ---- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}

h1 {
  font-size: var(--fs-h1);
  font-weight: 700;
}
h2 {
  font-size: var(--fs-h2);
  font-weight: 700;
}
h3 {
  font-size: var(--fs-h3);
}
h4 {
  font-size: var(--fs-h4);
}

p {
  margin: 0 0 1rem;
  color: var(--text-secondary);
}

.lead {
  font-size: var(--fs-lead);
  color: var(--text-secondary);
  font-weight: 400;
}

.display-text {
  font-size: var(--fs-display);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

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

.text-muted-custom {
  color: var(--text-muted) !important;
}

/* ---- Layout helpers ---- */
.container-xl {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

section {
  position: relative;
}

.section-py {
  padding-block: var(--section-py);
}

.section-py-sm {
  padding-block: clamp(2.5rem, 5vw, 4.5rem);
}

.bg-surface {
  background-color: var(--bg-surface);
}

.bg-surface-alt {
  background-color: var(--bg-surface-alt);
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-blue) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-blue) 25%, transparent);
  color: var(--color-blue);
  font-size: var(--fs-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
}
[data-theme="dark"] .section-badge {
  color: #93b4ff;
}

.section-badge i,
.section-badge span.dot {
  color: var(--color-purple);
}

.section-heading {
  max-width: 720px;
  margin-inline: auto;
  text-align: center;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.section-heading.text-start {
  margin-inline: 0;
  text-align: left;
}

/* ---- Scrollbar polish ---- */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--color-blue), var(--color-purple));
  border-radius: var(--radius-pill);
}

/* ---- Divider waves ---- */
.divider-wave {
  position: absolute;
  left: 0;
  width: 100%;
  line-height: 0;
  z-index: 1;
  pointer-events: none;
}
.divider-wave.top {
  top: -1px;
}
.divider-wave.bottom {
  bottom: -1px;
  transform: rotate(180deg);
}
.divider-wave svg {
  width: 100%;
  height: clamp(40px, 8vw, 120px);
}
.divider-wave path {
  fill: var(--bg-body);
}

/* ---- Lazy image fade-in ---- */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity 0.5s var(--ease-out-quart);
}
img[loading="lazy"].loaded,
img.is-loaded {
  opacity: 1;
}

/* ---- Visually hidden ---- */
.visually-hidden-focusable:not(:focus):not(:focus-within) {
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute !important;
  white-space: nowrap;
  width: 1px;
}