/* ==========================================================================
   SIGNAL — Certifications page
   ========================================================================== */

@layer sections {

  .certs-hero {
    position: relative;
    padding-block: clamp(8rem, 18vh, 12rem) clamp(2rem, 5vw, 4rem);
    z-index: var(--z-content);
  }

  .certs-hero__inner { display: grid; gap: clamp(1.25rem, 2.5vw, 2rem); }

  .certs-hero__title {
    font-size: var(--step-6);
    line-height: 0.88;
    letter-spacing: -0.05em;
    text-transform: uppercase;
    font-variation-settings: "wdth" 92, "opsz" 96;
    max-width: 14ch;
  }

  .certs-hero__title .out {
    color: transparent;
    -webkit-text-stroke: clamp(1px, 0.13vw, 2.2px) var(--ink);
  }

  .certs-hero__lede {
    max-width: 56ch;
    font-size: var(--step-1);
    line-height: 1.45;
    color: var(--ink-2);
  }

  .certs-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: clamp(1rem, 2.5vw, 2rem);
    margin-block-start: clamp(0.5rem, 2vw, 1.5rem);
    padding-block-start: clamp(1.25rem, 2.5vw, 2rem);
    border-block-start: 1px solid var(--line);
  }

  /* ---- Toolbar: filters + search ---------------------------------------- */
  .certs-bar {
    position: sticky;
    inset-block-start: clamp(4.25rem, 8vh, 5.25rem);
    z-index: 20;
    display: grid;
    gap: 0.85rem;
    padding: 0.85rem;
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    background: color-mix(in oklab, var(--bg) 86%, transparent);
    backdrop-filter: blur(18px) saturate(150%);
    -webkit-backdrop-filter: blur(18px) saturate(150%);
    box-shadow: var(--shadow-sm);
  }

  @media (min-width: 860px) {
    .certs-bar { grid-template-columns: 1fr auto; align-items: center; }
  }

  .certs-filters { display: flex; flex-wrap: wrap; gap: 0.35rem; }

  .certs-bar__right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
  }

  .filter-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.42rem 0.8rem;
    border: 1px solid var(--line);
    border-radius: var(--r-pill);
    background: var(--surface);
    font-size: var(--step--1);
    font-weight: 500;
    color: var(--ink-2);
    white-space: nowrap;
    transition: color var(--t-fast), background var(--t-fast),
                border-color var(--t-fast), transform var(--t-fast) var(--ease-spring);
  }

  .filter-chip span {
    font-family: var(--font-mono);
    font-size: 0.72em;
    color: var(--ink-3);
    transition: color var(--t-fast);
  }

  .filter-chip:hover { color: var(--ink); border-color: var(--line-strong); transform: translateY(-2px); }

  .filter-chip.is-active {
    background: var(--brand);
    border-color: transparent;
    color: var(--on-brand);
    font-weight: 600;
  }
  .filter-chip.is-active span { color: color-mix(in oklab, var(--on-brand) 60%, transparent); }

  .certs-search {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.5rem 0.9rem;
    border: 1px solid var(--line);
    border-radius: var(--r-pill);
    background: var(--bg-3);
    min-inline-size: min(100%, 230px);
  }

  .certs-search svg { inline-size: 1rem; block-size: 1rem; color: var(--ink-3); flex: none; }

  .certs-search input {
    flex: 1;
    min-inline-size: 0;
    border: 0;
    background: none;
    outline: none;
    font-size: var(--step--1);
    color: var(--ink);
  }
  .certs-search input::placeholder { color: var(--ink-3); }

  .certs-count {
    font-family: var(--font-mono);
    font-size: var(--step--2);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-3);
    white-space: nowrap;
  }

  /* ---- Grid -------------------------------------------------------------- */
  .certs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 330px), 1fr));
    gap: clamp(0.75rem, 1.4vw, 1.15rem);
    margin-block-start: clamp(1.5rem, 3vw, 2.5rem);
  }

  .cert {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 1rem;
    align-items: start;
    padding: clamp(1.1rem, 2vw, 1.5rem);
  }

  .cert[hidden] { display: none; }

  /* Featured credentials get a lime hairline down the leading edge. */
  .cert.is-featured::after {
    content: "";
    position: absolute;
    inset-block: 0;
    inset-inline-start: 0;
    inline-size: 3px;
    background: linear-gradient(var(--brand), transparent);
  }

  .cert__mark {
    position: relative;
    display: grid;
    place-items: center;
    inline-size: 2.6rem;
    block-size: 2.6rem;
    flex: none;
    padding: 0.4rem;
    border-radius: 11px;
    background: #fff;
    border: 1px solid var(--brandc, var(--accent));
    box-shadow: 0 6px 18px -8px var(--brandc, var(--accent));
    transition: transform var(--t-mid) var(--ease-spring);
    overflow: hidden;
  }

  .cert__mark img {
    inline-size: 100%;
    block-size: 100%;
    object-fit: contain;
  }

  .cert__mark-fallback {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    background: var(--brandc, var(--accent));
    color: #fff;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: -0.02em;
  }

  .cert:hover .cert__mark { transform: rotate(-8deg) scale(1.08); }

  .cert__body { display: grid; gap: 0.4rem; min-inline-size: 0; }

  .cert__issuer {
    font-family: var(--font-mono);
    font-size: var(--step--2);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-3);
  }

  .cert__title {
    font-size: var(--step-0);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--ink);
    text-wrap: balance;
  }

  .cert__note {
    font-size: var(--step--1);
    line-height: 1.45;
    color: var(--ink-2);
  }

  .cert__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem;
    margin-block-start: 0.25rem;
  }

  .cert__date {
    font-family: var(--font-mono);
    font-size: var(--step--2);
    color: var(--ink-2);
  }

  .cert__tag {
    padding: 0.15rem 0.5rem;
    border: 1px solid var(--line);
    border-radius: var(--r-xs);
    font-family: var(--font-mono);
    font-size: var(--step--2);
    color: var(--ink-3);
  }

  .cert__go {
    display: grid;
    place-items: center;
    inline-size: 2rem;
    block-size: 2rem;
    border-radius: 50%;
    border: 1px solid var(--line);
    color: var(--ink-3);
    transition: transform var(--t-mid) var(--ease-spring),
                background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
  }

  .cert__go svg { inline-size: 0.85rem; block-size: 0.85rem; }

  .cert:hover .cert__go {
    background: var(--ink);
    border-color: var(--ink);
    color: var(--bg);
    transform: translate(2px, -2px) scale(1.06);
  }

  .certs-empty {
    padding: clamp(3rem, 8vw, 6rem) 1rem;
    text-align: center;
    color: var(--ink-3);
  }

  .certs-empty h3 { font-size: var(--step-2); color: var(--ink-2); margin-block-end: 0.5rem; }

  /* ---- Issuer wall ------------------------------------------------------- */
  .issuer-wall {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-block-start: 1rem;
  }

  .issuer-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.85rem 0.4rem 0.4rem;
    border: 1px solid var(--line);
    border-radius: var(--r-pill);
    background: var(--surface);
    font-size: var(--step--1);
    color: var(--ink-2);
  }

  .issuer-pill i {
    inline-size: 1.5rem;
    block-size: 1.5rem;
    flex: none;
    display: grid;
    place-items: center;
    padding: 0.2rem;
    border-radius: 7px;
    background: #fff;
    border: 1px solid var(--c);
    font-style: normal;
    overflow: hidden;
  }

  .issuer-pill i img {
    inline-size: 100%;
    block-size: 100%;
    object-fit: contain;
  }
}