/* Shared building blocks: layout shell, header, buttons, photos, reveals. */

.shell {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: var(--page-gutter);
}

.section {
  padding-block: clamp(var(--space-16), 9vw, var(--space-32));
}

.section--tight {
  padding-block: clamp(var(--space-12), 6vw, var(--space-24));
}

.section--tint {
  background: var(--color-tint);
}

.section__title {
  font-size: clamp(var(--text-2xl), 4.2vw, var(--text-4xl));
  max-width: 22ch;
}

.section__lead {
  margin-top: var(--space-6);
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.eyebrow {
  display: inline-block;
  margin-bottom: var(--space-6);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-brand);
}

.icon {
  width: 1.5em;
  height: 1.5em;
  flex: none;
  fill: currentColor;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: var(--border-hairline) solid transparent;
  transition: border-color var(--duration-fast) var(--ease-press);
}

.site-header[data-stuck="true"] {
  border-bottom-color: var(--color-line);
}

.site-header__bar {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  min-height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  text-decoration: none;
}

.brand__mark {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: var(--radius-pill);
  background: var(--color-brand);
  position: relative;
}

.brand__mark::after {
  content: "";
  position: absolute;
  inset: 28%;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  transform: translate(22%, -22%);
}

.site-nav {
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.site-nav__link {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--duration-fast) var(--ease-press);
}

.site-nav__link[aria-current="true"] {
  background: var(--color-tint);
  color: var(--color-brand);
}

.site-header__tools {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.tool-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-width: 2.75rem;
  min-height: 2.75rem;
  padding: var(--space-2) var(--space-3);
  border: var(--border-hairline) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  font-size: var(--text-sm);
  font-weight: 700;
  transition: transform var(--duration-instant) var(--ease-press),
    background-color var(--duration-fast) var(--ease-press);
}

.tool-button:active {
  transform: scale(0.97);
}

.tool-button[aria-pressed="true"] {
  background: var(--color-brand);
  border-color: var(--color-brand);
  color: var(--color-bg);
}

.menu-toggle {
  display: none;
}

/* Buttons */

.btn {
  --magnet-x: 0px;
  --magnet-y: 0px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 3.25rem;
  padding: var(--space-3) var(--space-8);
  border: var(--border-strong) solid transparent;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: var(--text-base);
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transform: translate(var(--magnet-x), var(--magnet-y));
  transition: transform var(--duration-fast) var(--ease-primary),
    background-color var(--duration-fast) var(--ease-press),
    box-shadow var(--duration-fast) var(--ease-press);
}

.btn:active {
  transform: translate(var(--magnet-x), var(--magnet-y)) scale(0.97);
  transition-duration: var(--duration-instant);
}

.btn .icon {
  width: 1.2em;
  height: 1.2em;
  transition: transform var(--duration-fast) var(--ease-primary);
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  box-shadow: var(--shadow-surface);
}

.btn--ghost {
  border-color: var(--color-ink);
  color: var(--color-ink);
  background: transparent;
}

.btn--on-deep {
  border-color: var(--color-on-deep);
  color: var(--color-on-deep);
  background: transparent;
}

.btn--small {
  min-height: 2.75rem;
  padding: var(--space-2) var(--space-6);
  font-size: var(--text-sm);
}

@media (hover: hover) and (pointer: fine) {
  .site-nav__link:hover {
    background: var(--color-tint);
  }

  .tool-button:hover {
    background: var(--color-tint);
  }

  .tool-button[aria-pressed="true"]:hover {
    background: var(--color-brand);
  }

  .btn--primary:hover {
    box-shadow: var(--shadow-lift);
  }

  .btn--ghost:hover {
    background: var(--color-ink);
    color: var(--color-bg);
  }

  .btn--on-deep:hover {
    background: var(--color-on-deep);
    color: var(--color-brand-deep);
  }

  .btn:hover .icon {
    transform: translateX(var(--space-1));
  }
}

/* Photos */

.photo {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-photo);
  background: var(--color-tint);
}

.photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.caption {
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* Surfaces */

.surface {
  background: var(--color-surface);
  border: var(--border-hairline) solid var(--color-line);
  border-radius: var(--radius-surface);
  box-shadow: var(--shadow-surface);
}

.sample-tag {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-ink-soft);
}

.check-list {
  display: grid;
  gap: var(--space-3);
}

.check-list li {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}

.check-list .icon {
  margin-top: 0.1em;
  color: var(--color-brand);
}

.check-list--no .icon {
  color: var(--color-danger);
}

/* Scroll reveals. Content stays visible when JavaScript is unavailable. */

.js [data-reveal] {
  opacity: 0;
  transform: translateY(var(--space-6));
  transition: opacity var(--duration-base) var(--ease-primary),
    transform var(--duration-base) var(--ease-primary);
  transition-delay: calc(var(--reveal-index, 0) * var(--stagger));
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .js [data-reveal] {
    transform: none;
    transition: opacity var(--duration-fast) linear;
    transition-delay: 0ms;
  }

  .btn,
  .btn:active {
    transform: none;
  }
}

/* Mobile navigation */

@media (max-width: 86rem) {
  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-height) 0 auto 0;
    margin: 0;
    padding: var(--space-4) var(--page-gutter) var(--space-8);
    background: var(--color-bg);
    border-bottom: var(--border-hairline) solid var(--color-line);
    box-shadow: var(--shadow-lift);
    opacity: 0;
    visibility: hidden;
    transform: translateY(calc(var(--space-2) * -1));
    transition: opacity var(--duration-fast) var(--ease-primary),
      transform var(--duration-fast) var(--ease-primary),
      visibility 0s linear var(--duration-fast);
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: none;
    transition-delay: 0s;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav__link {
    padding: var(--space-4);
    font-size: var(--text-lg);
    border-bottom: var(--border-hairline) solid var(--color-line);
    border-radius: 0;
  }

  .site-header__tools {
    margin-left: auto;
  }
}

@media (max-width: 40rem) {
  .site-header__cta {
    display: none;
  }
}

/* Theme button shows the icon of the theme it switches to */

.theme-toggle .icon--sun,
:root[data-theme="dark"] .theme-toggle .icon--moon {
  display: none;
}

:root[data-theme="dark"] .theme-toggle .icon--sun {
  display: block;
}

.lang-link {
  text-decoration: none;
  color: var(--color-ink);
}

@media (max-width: 40rem) {
  .menu-toggle__label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .site-header__bar {
    gap: var(--space-3);
  }
}

/* Header fit: tighter rhythm so five tools and seven links share one line */

.site-header__bar {
  gap: var(--space-4);
}

.site-nav__link {
  padding-inline: var(--space-2);
}

html[data-text="large"] .site-header__cta {
  display: none;
}

@media (max-width: 40rem) {
  .brand {
    font-size: var(--text-lg);
  }

  .brand__mark {
    width: 1.5rem;
    height: 1.5rem;
  }

  .site-header__bar {
    gap: var(--space-2);
  }

  .site-header__tools {
    gap: var(--space-1);
  }

  .tool-button {
    min-width: 2.5rem;
    min-height: 2.5rem;
    padding-inline: var(--space-2);
  }
}

@media (max-width: 40rem) {
  html[data-text="large"] .brand {
    font-size: var(--text-base);
  }

  html[data-text="large"] .brand__mark {
    width: 1.25rem;
    height: 1.25rem;
  }

  html[data-text="large"] .tool-button {
    min-width: 2.1rem;
    min-height: 2.1rem;
    padding-inline: var(--space-1);
  }

  html[data-text="large"] .shell.site-header__bar {
    padding-inline: var(--space-3);
  }
}