/* Reusable components: logotype, header, navigation, buttons, cards, tags, alerts, footer, backdrop. */

@layer components {
  .icon { flex: none; stroke: currentColor; fill: none; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }

  /* ── Logotype ── */
  .logotype {
    display: inline-flex; align-items: center; gap: 1px;
    font-size: 1.375rem; font-weight: var(--weight-semibold); letter-spacing: -.045em; line-height: 1;
    color: var(--text-strong); text-decoration: none;
    min-block-size: var(--tap-min);
  }
  .logotype:hover { color: var(--text-strong); }
  .logotype__dj { color: var(--accent); transition: color var(--dur-fast) var(--ease-standard); }
  .logotype:hover .logotype__dj { color: var(--accent-hover); }
  .logotype--inline { font-size: inherit; min-block-size: 0; }
  /* Footer: the brand sits in the legal line without standing out of it. */
  .logotype--muted { gap: 0; }
  .logotype--muted, .logotype--muted .logotype__dj,
  .logotype--muted:hover, .logotype--muted:hover .logotype__dj { color: inherit; font-weight: var(--weight-medium); letter-spacing: -.02em; }

  /* ── Header ── */
  .site-header {
    position: sticky; inset-block-start: 0; z-index: var(--z-sticky);
    background: var(--surface-overlay);
    -webkit-backdrop-filter: blur(var(--blur-glass)); backdrop-filter: blur(var(--blur-glass));
    border-block-end: 1px solid var(--border-subtle);
  }
  .site-header__inner {
    position: relative;
    display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
    column-gap: var(--space-4);
    max-inline-size: var(--container-max); margin-inline: auto;
    padding-inline: var(--gutter); min-block-size: var(--header-h);
  }
  .site-header__tools { display: flex; align-items: center; gap: var(--space-2); }

  /* Navigation: without JS it is a second row of links on phones; with JS it becomes a dropdown. */
  .site-nav { order: 3; inline-size: 100%; padding-block-end: var(--space-2); }
  .site-nav__list { display: flex; flex-wrap: wrap; gap: var(--space-1); list-style: none; margin: 0; padding: 0; }
  .site-nav__link {
    display: inline-flex; align-items: center; min-block-size: var(--tap-min);
    padding-inline: var(--space-3); border-radius: var(--radius-sm);
    font-size: var(--fs-body-sm); font-weight: var(--weight-medium);
    color: var(--text-muted); text-decoration: none;
    transition: color var(--dur-fast) var(--ease-standard), background var(--dur-fast) var(--ease-standard);
  }
  .site-nav__link:hover { color: var(--text-strong); background: var(--accent-tint); }
  .site-nav__link[aria-current="page"] { color: var(--text-strong); }
  .site-nav__link[aria-current="page"]::after {
    content: ""; inline-size: 5px; block-size: 5px; margin-inline-start: var(--space-2);
    border-radius: 50%; background: var(--accent);
  }

  .nav-toggle { display: none; }
  .js .nav-toggle { display: inline-flex; }
  .nav-toggle__close { display: none; }
  .nav-toggle[aria-expanded="true"] .nav-toggle__open { display: none; }
  .nav-toggle[aria-expanded="true"] .nav-toggle__close { display: inline-flex; }
  .nav-toggle__open, .theme-toggle__moon { display: inline-flex; }

  .js .site-nav {
    position: absolute; inset-inline: 0; inset-block-start: 100%;
    padding: var(--space-2) var(--gutter) var(--space-4);
    background: var(--surface-page); border-block-end: 1px solid var(--border-subtle);
    display: none;
  }
  .js .site-nav.is-open { display: block; animation: dj-rise var(--dur-base) var(--ease-out) both; }
  .js .site-nav__list { flex-direction: column; }

  @media (min-width: 48rem) {
    .site-header__inner { flex-wrap: nowrap; }
    .site-nav, .js .site-nav {
      order: 0; display: block; position: static; inline-size: auto;
      padding: 0; background: none; border: 0; margin-inline: auto var(--space-4);
      animation: none;
    }
    .js .site-nav__list { flex-direction: row; }
    .js .nav-toggle { display: none; }
  }

  /* ── Icon buttons, theme toggle ── */
  .icon-button {
    display: inline-flex; align-items: center; justify-content: center;
    inline-size: var(--tap-min); block-size: var(--tap-min); padding: 0;
    background: transparent; color: var(--text-muted);
    border: 1px solid var(--border-subtle); border-radius: var(--radius-control);
    transition: background var(--dur-fast) var(--ease-standard), color var(--dur-fast) var(--ease-standard),
      border-color var(--dur-fast) var(--ease-standard), transform var(--dur-instant) var(--ease-standard);
  }
  .icon-button:hover { background: var(--accent-tint); color: var(--text-accent); border-color: var(--border-accent); }
  .icon-button:active { transform: scale(var(--press-scale)); }

  .theme-toggle { display: none; }
  .js .theme-toggle { display: inline-flex; }
  .theme-toggle__sun { display: none; }
  :root[data-theme="light"] .theme-toggle__moon { display: none; }
  :root[data-theme="light"] .theme-toggle__sun { display: inline-flex; }
  @media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) .theme-toggle__moon { display: none; }
    :root:not([data-theme="dark"]) .theme-toggle__sun { display: inline-flex; }
  }

  /* ── Buttons ── */
  .btn {
    --btn-bg: var(--accent); --btn-fg: var(--text-on-accent); --btn-bd: transparent;
    display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
    min-block-size: var(--tap-min); padding: 0 var(--space-5);
    background: var(--btn-bg); color: var(--btn-fg); border: 1px solid var(--btn-bd);
    border-radius: var(--radius-control);
    font-size: var(--fs-body-sm); font-weight: var(--weight-medium); line-height: 1;
    letter-spacing: var(--tracking-body); text-decoration: none; white-space: nowrap;
    transition: background var(--dur-fast) var(--ease-standard), color var(--dur-fast) var(--ease-standard),
      border-color var(--dur-fast) var(--ease-standard), box-shadow var(--dur-base) var(--ease-out),
      transform var(--dur-instant) var(--ease-standard);
  }
  .btn:hover { --btn-bg: var(--accent-hover); --btn-fg: var(--text-on-accent); box-shadow: var(--glow-accent-soft); }
  .btn:active { transform: scale(var(--press-scale)); --btn-bg: var(--accent-press); }
  .btn .icon { transition: transform var(--dur-base) var(--ease-out); }
  .btn:hover .icon { transform: translateX(3px); }
  .btn--lg { min-block-size: 52px; padding-inline: 26px; font-size: var(--fs-body-lg); gap: 10px; }
  .btn--full { display: flex; inline-size: 100%; }
  .btn[disabled], .btn[aria-disabled="true"] { opacity: .42; cursor: not-allowed; pointer-events: none; }

  .btn--secondary {
    --btn-bg: var(--surface-card); --btn-fg: var(--text-strong); --btn-bd: var(--border-default);
    box-shadow: var(--shadow-hairline);
  }
  .btn--secondary:hover { --btn-bg: var(--surface-raised); --btn-fg: var(--text-strong); --btn-bd: var(--border-strong); box-shadow: var(--shadow-hairline); }
  .btn--secondary:active { --btn-bg: var(--surface-raised); }

  .btn--ghost { --btn-bg: transparent; --btn-fg: var(--text-body); }
  .btn--ghost:hover { --btn-bg: var(--accent-tint); --btn-fg: var(--text-accent); box-shadow: none; }
  .btn--ghost:active { --btn-bg: var(--accent-tint-strong); }

  /* ── Cards ── */
  .card {
    position: relative; display: block; padding: var(--space-6);
    background: var(--surface-card); border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card); box-shadow: var(--shadow-card);
    color: inherit; text-decoration: none;
  }
  .card--glow { box-shadow: var(--glow-accent); }
  .card--interactive {
    transition: transform var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-standard), box-shadow var(--dur-base) var(--ease-out);
  }
  .card--interactive:hover { transform: translateY(var(--lift-hover)); border-color: var(--border-strong); }
  .card__icon {
    display: inline-flex; align-items: center; justify-content: center;
    inline-size: 40px; block-size: 40px; border-radius: var(--radius-md);
    background: var(--accent-tint); color: var(--text-accent); border: 1px solid var(--border-accent);
  }
  .card__title { margin-block-start: var(--space-5); font-size: var(--fs-h4); }
  .card__text { margin-block-start: var(--space-2); font-size: var(--fs-body-sm); color: var(--text-muted); }

  /* ── Tags and badges ── */
  .tag-list { display: flex; flex-wrap: wrap; gap: var(--space-2); list-style: none; margin: 0; padding: 0; }
  .tag {
    display: inline-flex; align-items: center; padding: 5px 11px; white-space: nowrap;
    color: var(--text-body); border: 1px solid var(--border-default); border-radius: var(--radius-pill);
    font-family: var(--font-mono); font-size: var(--fs-micro); letter-spacing: var(--tracking-wide); line-height: 1.4;
    transition: background var(--dur-fast) var(--ease-standard), border-color var(--dur-fast) var(--ease-standard), color var(--dur-fast) var(--ease-standard);
  }
  .tag:hover { background: var(--accent-tint); border-color: var(--border-accent); color: var(--text-accent); }

  .badge {
    display: inline-flex; align-items: center; gap: 6px; padding: 3px 9px; white-space: nowrap;
    background: var(--accent-tint); color: var(--text-accent); border: 1px solid var(--border-accent);
    border-radius: var(--radius-pill); font-size: var(--fs-micro); font-weight: var(--weight-medium);
    letter-spacing: var(--tracking-wide); line-height: 1.5;
  }
  .badge--dot::before { content: ""; inline-size: 6px; block-size: 6px; border-radius: 50%; background: currentColor; }

  /* ── Alerts ── */
  .alert {
    --alert-bg: var(--accent-tint); --alert-bd: var(--border-accent); --alert-fg: var(--text-accent);
    display: flex; gap: var(--space-3); padding: var(--space-4) var(--space-5);
    background: var(--alert-bg); border: 1px solid var(--alert-bd); border-radius: var(--radius-md);
  }
  .alert--success { --alert-bg: var(--success-tint); --alert-bd: var(--success); --alert-fg: var(--success); }
  .alert--warning { --alert-bg: var(--warning-tint); --alert-bd: var(--warning); --alert-fg: var(--warning); }
  .alert--danger { --alert-bg: var(--danger-tint); --alert-bd: var(--danger); --alert-fg: var(--danger); }
  .alert__icon { color: var(--alert-fg); margin-block-start: 1px; }
  .alert__body { display: flex; flex-direction: column; gap: 2px; min-inline-size: 0; font-size: var(--fs-body-sm); color: var(--text-body); }
  .alert__title { font-size: var(--fs-body-sm); }

  /* ── Section heading ── */
  .eyebrow {
    font-family: var(--font-mono); font-size: var(--fs-micro); text-transform: uppercase;
    letter-spacing: var(--tracking-label); color: var(--text-accent); line-height: 1.4;
  }
  .section-heading { display: flex; flex-direction: column; gap: var(--space-4); }
  .section-heading__title { font-size: var(--fs-h2); letter-spacing: var(--tracking-heading); max-inline-size: 22ch; }
  .section-heading--page .section-heading__title { font-size: var(--fs-h1); }
  .section-heading__lead { max-inline-size: var(--measure-prose); font-size: var(--fs-lead); color: var(--text-muted); }

  /* ── Backdrop: square grid with drifting light patches (hero, optional CTA) ── */
  .grid-bg { position: relative; isolation: isolate; }
  .grid-bg__layer {
    position: absolute; inset: 0; z-index: -1; overflow: hidden; pointer-events: none;
    background-image:
      linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
      linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
    background-size: var(--grid-cell) var(--grid-cell);
    -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 35%, transparent 100%);
    mask-image: radial-gradient(120% 90% at 50% 0%, #000 35%, transparent 100%);
  }
  .grid-bg--flat .grid-bg__layer { -webkit-mask-image: none; mask-image: none; }
  .grid-bg__glow { position: absolute; border-radius: 50%; will-change: transform; }
  .grid-bg__glow--azure {
    inset-block-start: -22%; inset-inline-start: 8%; inline-size: 54%; block-size: 80%;
    background: radial-gradient(circle at center, var(--glow-azure) 0%, transparent 66%);
    filter: blur(18px); animation: dj-drift-a calc(var(--dur-ambient) * 2.2) var(--ease-in-out) infinite;
  }
  .grid-bg__glow--cyan {
    inset-block-start: -6%; inset-inline-end: 2%; inline-size: 44%; block-size: 70%;
    background: radial-gradient(circle at center, var(--glow-cyan) 0%, transparent 70%);
    filter: blur(22px); animation: dj-drift-b calc(var(--dur-ambient) * 3.4) var(--ease-in-out) infinite;
  }

  /* ── Backdrop: rings spreading like ripples on water (closing CTA) ── */
  .ripples { position: relative; isolation: isolate; overflow: hidden; }
  .ripples__layer {
    position: absolute; inset: 0; z-index: -1; pointer-events: none;
    -webkit-mask-image: radial-gradient(60% 80% at 50% 50%, #000 30%, transparent 80%);
    mask-image: radial-gradient(60% 80% at 50% 50%, #000 30%, transparent 80%);
  }
  .ripples__ring {
    --ring-scale: 1;
    position: absolute; inset-block-start: 50%; inset-inline-start: 50%;
    inline-size: min(68rem, 150vw); aspect-ratio: 1; border: 1px solid var(--ripple-line); border-radius: 50%;
    opacity: 0; transform: translate(-50%, -50%) scale(.06);
    animation: dj-ripple 15s cubic-bezier(.25, .6, .45, 1) infinite;
  }
  .ripples__ring:nth-child(1) { --ring-scale: .2; }
  .ripples__ring:nth-child(2) { --ring-scale: .4; animation-delay: -3s; }
  .ripples__ring:nth-child(3) { --ring-scale: .6; animation-delay: -6s; }
  .ripples__ring:nth-child(4) { --ring-scale: .8; animation-delay: -9s; }
  .ripples__ring:nth-child(5) { --ring-scale: 1; animation-delay: -12s; }
  /* Reduced motion: the rings stand still as concentric circles. */
  @media (prefers-reduced-motion: reduce) {
    .ripples__ring { animation-name: none; opacity: .8; transform: translate(-50%, -50%) scale(var(--ring-scale)); }
  }

  /* ── Forms ── */
  .form { display: flex; flex-direction: column; gap: var(--space-5); }
  .form__row { display: grid; gap: var(--space-5); }
  @media (min-width: 40rem) { .form__row { grid-template-columns: 1fr 1fr; } }
  .form__note { font-size: var(--fs-caption); color: var(--text-faint); }
  .form__trap { position: absolute; inset-inline-start: -10000px; inline-size: 1px; block-size: 1px; overflow: hidden; }

  .field { display: flex; flex-direction: column; gap: var(--space-2); min-inline-size: 0; }
  .field__label { padding: 0; font-size: var(--fs-caption); font-weight: var(--weight-medium); color: var(--text-strong); }
  .field__req { margin-inline-start: 4px; color: var(--text-accent); }
  .field__hint { font-size: var(--fs-caption); color: var(--text-faint); }
  .field__error { font-size: var(--fs-caption); color: var(--text-danger); }

  .input {
    inline-size: 100%; min-block-size: var(--tap-min); padding: 11px 14px;
    background: var(--surface-inset); color: var(--text-strong);
    border: 1px solid var(--border-default); border-radius: var(--radius-control);
    font-size: var(--fs-body-sm); line-height: 1.5;
    transition: border-color var(--dur-fast) var(--ease-standard), box-shadow var(--dur-fast) var(--ease-standard);
  }
  .input::placeholder { color: var(--text-faint); opacity: 1; }
  .input:hover { border-color: var(--border-strong); }
  .input:focus { outline: 2px solid transparent; border-color: var(--accent); box-shadow: var(--ring-focus); }
  .input[aria-invalid="true"] { border-color: var(--danger); }
  .input--area { min-block-size: 9rem; resize: vertical; line-height: var(--leading-body); }

  .select { position: relative; }
  .select select { appearance: none; padding-inline-end: 38px; cursor: pointer; }
  .select::after {
    content: ""; position: absolute; inset-inline-end: 16px; inset-block-start: 50%;
    inline-size: 8px; block-size: 8px; margin-block-start: -6px; pointer-events: none;
    border-inline-end: 1.5px solid var(--text-muted); border-block-end: 1.5px solid var(--text-muted);
    transform: rotate(45deg);
  }

  .choice { position: relative; display: flex; align-items: flex-start; gap: var(--space-3); min-block-size: var(--tap-min); padding-block: 11px; cursor: pointer; }
  .choice__input { position: absolute; opacity: 0; inline-size: 1px; block-size: 1px; }
  .choice__label { font-size: var(--fs-body-sm); color: var(--text-body); line-height: 1.5; }
  .choice__mark {
    flex: none; display: inline-flex; align-items: center; justify-content: center;
    inline-size: 20px; block-size: 20px; margin-block-start: 1px;
    background: var(--surface-inset); border: 1px solid var(--border-strong);
    transition: background var(--dur-fast) var(--ease-standard), border-color var(--dur-fast) var(--ease-standard);
  }
  .choice:hover .choice__mark { border-color: var(--accent); }
  .choice__input:focus-visible + .choice__mark { outline: 2px solid var(--accent); outline-offset: 2px; }
  .choice__input[aria-invalid="true"] + .choice__mark { border-color: var(--danger); }
  .choice__mark--radio { border-radius: 50%; }
  .choice__mark--radio::after {
    content: ""; inline-size: 9px; block-size: 9px; border-radius: 50%; background: var(--accent);
    transform: scale(0); transition: transform var(--dur-base) var(--ease-out);
  }
  .choice__input:checked + .choice__mark--radio { border-color: var(--accent); }
  .choice__input:checked + .choice__mark--radio::after { transform: scale(1); }
  .choice__mark--check { border-radius: var(--radius-xs); color: var(--text-on-accent); }
  .choice__mark--check .icon { stroke-width: 2.5; opacity: 0; transform: scale(.6); transition: opacity var(--dur-fast) var(--ease-standard), transform var(--dur-base) var(--ease-out); }
  .choice__input:checked + .choice__mark--check { background: var(--accent); border-color: var(--accent); }
  .choice__input:checked + .choice__mark--check .icon { opacity: 1; transform: none; }

  .btn[aria-busy="true"] { opacity: .7; pointer-events: none; }

  /* ── Footer ── */
  .site-footer { border-block-start: 1px solid var(--border-subtle); background: var(--surface-1); padding-block: var(--space-6); }
  .site-footer__inner {
    display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
    gap: var(--space-2) var(--space-6); text-align: center;
    font-size: var(--fs-caption); color: var(--text-faint);
  }
  .site-footer__links { display: flex; gap: var(--space-4); list-style: none; margin: 0; padding: 0; }
  .site-footer__links a {
    display: inline-flex; align-items: center; gap: 4px; min-block-size: var(--tap-min);
    color: var(--text-muted); text-decoration: none;
  }
  .site-footer__links a:hover { color: var(--text-accent); }

  /* ── Entrance ── */
  .js .reveal { opacity: 0; }
  .js .reveal.is-visible { animation: dj-rise var(--dur-slow) var(--ease-entrance) both; animation-delay: var(--reveal-delay, 0ms); }
}