/* ==========================================================================
   KittyCats - page styles (on top of ../assets/css/base.css)
   Every section demonstrates one layout technique; the technique is named
   in the page itself (.technique) and in the comments below.
   ========================================================================== */

@layer page {
  :root {
    --accent: var(--c-kitty);
    --accent-soft: var(--c-kitty-soft);
    --sticky-top: calc(var(--header-h) + var(--space-5));
  }

  .sprite {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
  }

  /* Fur colours (currentColor inside the <symbol>) */
  .fur-ginger { color: #e8913a; }
  .fur-black { color: #34303a; }
  .fur-white { color: #f7f2ea; }
  .fur-grey { color: #9ea4ad; }
  .fur-tabby { color: #a8744a; }
  .fur-cream { color: #efd2a4; }
  .fur-chocolate { color: #7b5236; }
  .fur-blue { color: #7f90a6; }

  /* ---------- Header: nav drops to its own row on small screens ---------- */

  @media (max-width: 47.99em) {
    :root {
      --sticky-top: var(--space-4);
    }

    html {
      scroll-padding-top: var(--space-4);
    }

    .site-header {
      position: relative;
    }

    .site-header__inner {
      flex-wrap: wrap;
      padding-block: var(--space-2);
    }

    .site-nav {
      order: 3;
      flex-basis: 100%;
      margin-left: calc(-1 * var(--space-3));
    }
  }

  /* ---------- Shared bits ---------- */

  .demo-note {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    margin-top: var(--space-5);
    padding: var(--space-3) var(--space-4);
    font-size: var(--step--1);
    line-height: 1.5;
    border: 1.5px dashed var(--accent);
    border-radius: var(--radius-md);
  }

  .demo-note svg {
    flex: none;
    width: 1.25rem;
    height: 1.25rem;
    margin-top: 0.1rem;
    fill: none;
    stroke: var(--accent);
    stroke-width: 2;
    stroke-linecap: round;
  }

  .section-head {
    margin-bottom: var(--space-6);
  }

  .section-head h2,
  .questions__head h2 {
    margin-top: var(--space-2);
  }

  .eyebrow {
    color: var(--accent);
  }

  .section-text {
    max-width: 62ch;
    margin-top: var(--space-3);
    color: var(--c-text-muted);
  }

  /* "Technique" note next to every section */
  /* The label sits above the text: flex-wrap lets the long text take its own line. */
  .technique {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: var(--space-2) var(--space-3);
    max-width: 62ch;
    margin-top: var(--space-4);
    padding: var(--space-3) var(--space-4);
    font-size: var(--step--1);
    line-height: 1.55;
    color: var(--c-text-muted);
    border: 1.5px dashed var(--c-border-strong);
    border-radius: var(--radius-md);
  }

  .technique strong {
    color: var(--c-text);
  }

  .technique__label {
    flex: none;
    margin-top: 0.1rem;
    padding: 1px var(--space-2);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-soft);
    border-radius: var(--radius-pill);
  }

  code {
    padding: 0 0.3em;
    font-family: var(--font-mono);
    font-size: 0.92em;
    color: var(--c-text);
    background: var(--c-surface-2);
    border-radius: 4px;
    overflow-wrap: anywhere;
  }

  .questions,
  .gallery,
  .cats,
  .about,
  .contact {
    padding-block: var(--space-5);
  }

  /* Cobweb thread with a dangling spider between sections */
  .web-divider {
    position: relative;
    height: 3.5rem;
    margin-block: var(--space-5);
  }

  .web-divider::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 1px;
    background: repeating-linear-gradient(90deg, var(--c-border-strong) 0 6px, transparent 6px 12px);
  }

  .web-divider svg {
    position: absolute;
    top: 0;
    right: 14%;
    width: 1.6rem;
    aspect-ratio: 2 / 3;
    color: var(--c-text-muted);
    transform-origin: top center;
    animation: dangle 5s ease-in-out infinite;
  }

  .web-divider:nth-of-type(even) svg {
    right: auto;
    left: 20%;
    animation-delay: -2s;
  }

  @keyframes dangle {
    0%,
    100% {
      transform: translateY(-5px) rotate(-4deg);
    }

    50% {
      transform: translateY(5px) rotate(4deg);
    }
  }

  /* ==========================================================================
     Hero - Fluid layout: clamp() type, aspect-ratio artwork
     ========================================================================== */

  .hero {
    display: grid;
    align-items: center;
    gap: var(--space-6);
    padding-block: var(--space-6) var(--space-5);
  }

  @media (min-width: 48em) {
    .hero {
      grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    }
  }

  .hero__text {
    display: grid;
    justify-items: start;
    gap: var(--space-4);
  }

  .hero h1 {
    font-size: clamp(2.75rem, 1.9rem + 4.2vw, 5.25rem);
    letter-spacing: -0.03em;
  }

  .hero__art {
    position: relative;
    aspect-ratio: 5 / 4;
    overflow: hidden;
    background:
      radial-gradient(circle at 28% 78%, var(--c-kitty-soft), transparent 58%),
      radial-gradient(circle at 80% 30%, var(--c-surface-2), transparent 50%),
      var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-1);
  }

  .hero__art svg {
    position: absolute;
  }

  .hero__web {
    top: -2px;
    left: -2px;
    width: 32%;
    aspect-ratio: 1;
    color: var(--c-text-muted);
    opacity: 0.45;
  }

  .hero__kitten {
    bottom: 8%;
    left: 5%;
    width: 38%;
    aspect-ratio: 1;
  }

  .hero__cat {
    right: 5%;
    bottom: 7%;
    width: 46%;
    aspect-ratio: 1;
  }

  .hero__arrow {
    top: 56%;
    left: 43%;
    width: 11%;
    height: auto;
    aspect-ratio: 60 / 24;
    color: var(--c-kitty-deco);
  }

  .hero__spider {
    top: 0;
    right: 20%;
    width: 7%;
    aspect-ratio: 2 / 3;
    color: var(--c-text-muted);
    transform-origin: top center;
    animation: dangle 6s ease-in-out infinite;
  }

  /* ==========================================================================
     01 - Sticky section: sticky heading + stacking cards
     ========================================================================== */

  .questions {
    display: grid;
    gap: var(--space-6);
  }

  @media (min-width: 48em) {
    .questions {
      grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
      align-items: start;
    }

    .questions__head {
      position: sticky;
      top: var(--sticky-top);
    }
  }

  .questions__cards {
    display: grid;
    gap: var(--space-5);
    margin: 0;
    padding: 0 0 var(--space-6);
    list-style: none;
  }

  .qcard {
    --i: 0;
    position: sticky;
    top: calc(var(--sticky-top) + var(--i) * 1.4rem);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    gap: var(--space-3);
    min-height: clamp(14rem, 10rem + 12vw, 19rem);
    padding: var(--space-6) var(--space-5) var(--space-5);
    background: var(--qcard-bg, var(--c-surface));
    border: 1px solid var(--c-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2);
  }

  .qcard:nth-child(1) {
    --qcard-bg: var(--c-kitty-soft);
  }

  .qcard:nth-child(2) {
    --i: 1;
    --qcard-bg: var(--c-surface-2);
  }

  .qcard:nth-child(3) {
    --i: 2;
    --qcard-bg: var(--c-surface);
  }

  .qcard__num {
    position: absolute;
    top: var(--space-4);
    right: var(--space-5);
    font-family: var(--font-serif);
    font-size: clamp(3rem, 2rem + 4vw, 4.5rem);
    font-weight: 700;
    line-height: 1;
    color: var(--accent);
    opacity: 0.85;
  }

  .qcard h3 {
    max-width: 20ch;
    font-size: var(--step-2);
  }

  .qcard p {
    max-width: 44ch;
    color: var(--c-text-muted);
  }

  /* ==========================================================================
     02 - Grid gallery
     Phones/tablets: auto-fit tracks, featured tile spans the full row.
     From 768px: four tracks, featured tile spans 2 x 2.
     ========================================================================== */

  .gallery__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 9.5rem), 1fr));
    gap: var(--space-4);
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .morph--featured {
    grid-column: 1 / -1;
  }

  @media (min-width: 48em) {
    .gallery__grid {
      grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .morph--featured {
      grid-column: span 2;
      grid-row: span 2;
    }
  }

  .tile-ginger { --tile: light-dark(#fde3c6, #4a2f18); }
  .tile-black { --tile: light-dark(#e7e2f0, #5a5268); }
  .tile-white { --tile: light-dark(#dde8f0, #263642); }
  .tile-grey { --tile: light-dark(#e3e9ec, #2c353c); }
  .tile-tabby { --tile: light-dark(#f0e0cd, #3b2c20); }

  .morph {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--tile, var(--c-surface-2));
    border: 1px solid var(--c-border);
    border-radius: var(--radius-lg);
  }

  .morph__btn {
    position: relative;
    display: block;
    flex: 1 1 auto;
    width: 100%;
    aspect-ratio: 1;
    padding: 0;
    background: transparent;
    border: 0;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }

  .morph--featured .morph__btn {
    min-height: 16rem;
  }

  @media (min-width: 48em) {
    .morph--featured .morph__btn {
      aspect-ratio: auto;
    }
  }

  .morph__btn:focus-visible {
    outline-offset: -6px;
  }

  .morph__btn svg {
    position: absolute;
    inset: 0;
    width: 76%;
    max-height: 86%;
    margin: auto;
    aspect-ratio: 1;
    transition: opacity 320ms var(--ease), transform 420ms var(--ease);
  }


  .morph__cat {
    opacity: 0;
    transform: scale(0.82) translateY(6%);
  }

  .morph__btn[aria-pressed="true"] .morph__kitten {
    opacity: 0;
    transform: scale(1.12);
  }

  .morph__btn[aria-pressed="true"] .morph__cat {
    opacity: 1;
    transform: none;
  }

  @media (hover: hover) and (pointer: fine) {
    .morph__btn:hover .morph__kitten {
      opacity: 0;
      transform: scale(1.12);
    }

    .morph__btn:hover .morph__cat {
      opacity: 1;
      transform: none;
    }
  }

  .morph__caption {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: var(--c-surface);
    border-top: 1px solid var(--c-border);
  }

  .morph__state {
    padding: 0 var(--space-2);
    font-size: var(--step--1);
    color: var(--c-text-muted);
    border: 1px dashed var(--c-border-strong);
    border-radius: var(--radius-pill);
  }

  /* ==========================================================================
     03 - Flexbox card row
     ========================================================================== */

  /* Cards keep one width (no flex-grow), so a short last row never stretches;
     justify-content: center balances it instead. On phones a card takes the
     full row. */
  .cats__row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .cat-card {
    display: flex;
    flex: 1 1 100%;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-5);
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-1);
    transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  }

  /* Phones: two cards per row, so the list doesn't turn into three screens. */
  @media (min-width: 22em) and (max-width: 33.99em) {
    .cats__row {
      gap: var(--space-3);
    }

    .cat-card {
      flex: 1 1 calc(50% - var(--space-3) / 2);
      padding: var(--space-4);
    }

    .cat-card .cat-card__img {
      width: 4.5rem;
    }

    .cat-card .btn {
      padding-inline: var(--space-3);
    }
  }

  @media (min-width: 34em) {
    .cat-card {
      flex: 0 1 15rem;
    }
  }

  @media (min-width: 64em) {
    .cat-card {
      flex-basis: 16.5rem;
    }
  }

  .cat-card:hover {
    box-shadow: var(--shadow-2);
    transform: translateY(-3px);
  }

  .cat-card__img {
    width: 6.5rem;
    aspect-ratio: 1;
    margin-bottom: var(--space-2);
    padding: var(--space-2);
    background: var(--c-kitty-soft);
    border-radius: 50%;
  }

  .cat-card__traits {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
  }

  .cat-card__traits span {
    padding: 0 var(--space-2);
    font-size: var(--step--1);
    color: var(--c-text-muted);
    background: var(--c-surface-2);
    border-radius: var(--radius-pill);
  }

  .cat-card__text {
    color: var(--c-text-muted);
  }

  /* The flexbox trick: an auto margin swallows the free space above the
     button, so every button sits at the bottom of its card. `gap` keeps a
     minimum distance to the text. */
  .cat-card__btn {
    margin-top: auto;
  }

  /* ==========================================================================
     04 - Two-column split
     ========================================================================== */

  .split {
    display: grid;
    gap: var(--space-6);
  }

  @media (min-width: 48em) {
    .split {
      grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
      align-items: start;
    }
  }

  .split__main {
    display: grid;
    gap: var(--space-4);
  }

  .split__main p {
    max-width: 58ch;
  }

  .checklist {
    display: grid;
    gap: var(--space-3);
    padding: 0;
    list-style: none;
  }

  .checklist li {
    position: relative;
    padding-left: 2.25rem;
  }

  .checklist li::before {
    content: "";
    position: absolute;
    top: 0.15em;
    left: 0;
    width: 1.5rem;
    height: 1.5rem;
    background: var(--accent-soft);
    border-radius: 50%;
  }

  .checklist li::after {
    content: "";
    position: absolute;
    top: 0.42em;
    left: 0.55rem;
    width: 0.4rem;
    height: 0.75rem;
    border: solid var(--accent);
    border-width: 0 2.5px 2.5px 0;
    transform: rotate(45deg);
  }

  .person {
    position: relative;
    display: grid;
    gap: var(--space-3);
    padding: var(--space-6) var(--space-5) var(--space-5);
    overflow: hidden;
    background: var(--c-kitty-soft);
    border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
    border-radius: var(--radius-lg);
  }

  .person__web {
    position: absolute;
    top: -2px;
    right: -2px;
    width: 7rem;
    aspect-ratio: 1;
    color: var(--accent);
    opacity: 0.3;
    transform: scaleX(-1);
  }

  .person h3 {
    font-size: var(--step-2);
  }

  .person__links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-2);
    padding: 0;
    list-style: none;
  }

  .person__links a {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding: 0 var(--space-4);
    font-weight: 700;
    color: var(--c-text);
    text-decoration: none;
    background: var(--c-surface);
    border: 2px solid var(--c-border-strong);
    border-radius: var(--radius-pill);
  }

  .person__links a:hover {
    border-color: var(--c-text);
  }

  /* ==========================================================================
     05 - Form grid
     ========================================================================== */

  .cat-form {
    display: grid;
    gap: var(--space-5);
    max-width: 52rem;
    padding: clamp(1.25rem, 0.75rem + 2.5vw, 2.5rem);
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-1);
  }

  @media (min-width: 48em) {
    .cat-form {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .field--full {
      grid-column: 1 / -1;
    }
  }

  .field {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    min-width: 0;
    margin: 0;
    padding: 0;
    border: 0;
  }

  .field label:not(.radio),
  .field legend {
    padding: 0;
    font-weight: 700;
  }

  .field__optional {
    font-weight: 400;
    color: var(--c-text-muted);
  }

  .field input:not([type="radio"]),
  .field select,
  .field textarea {
    width: 100%;
    min-height: 48px;
    padding: var(--space-3) var(--space-4);
    background: var(--c-surface);
    border: 2px solid var(--c-border-strong);
    border-radius: var(--radius-md);
  }

  .field textarea {
    resize: vertical;
  }

  .field input::placeholder,
  .field textarea::placeholder {
    color: var(--c-text-muted);
    opacity: 1;
  }

  .field :is(input, select, textarea):focus-visible {
    border-color: var(--accent);
    outline-offset: 2px;
  }

  .field [aria-invalid="true"],
  .field--radios[aria-invalid="true"] .radio {
    border-color: var(--c-danger);
  }

  .radios {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
  }

  .radio {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    min-height: 48px;
    padding: 0 var(--space-5) 0 var(--space-4);
    font-weight: 600;
    background: var(--c-surface);
    border: 2px solid var(--c-border-strong);
    border-radius: var(--radius-pill);
    cursor: pointer;
  }

  .radio:has(input:checked) {
    background: var(--accent-soft);
    border-color: var(--accent);
  }

  .radio input {
    width: 1.15rem;
    height: 1.15rem;
    margin: 0;
    accent-color: var(--accent);
  }

  .field__error {
    font-size: var(--step--1);
    font-weight: 600;
    color: var(--c-danger);
  }

  .field__error:empty {
    display: none;
  }

  .cat-form__actions {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-4);
  }

  .cat-form__status {
    font-weight: 600;
  }

  .cat-form__status:not(:empty) {
    flex: 1 1 18rem;
    padding: var(--space-3) var(--space-4);
    background: var(--c-geo-soft);
    border-left: 4px solid var(--c-geo);
    border-radius: var(--radius-sm);
  }

  /* ==========================================================================
     06 - Footer (layout lives in base.css; this adds the technique note)
     ========================================================================== */

  .technique--footer {
    max-width: none;
    margin: 0 0 var(--space-5);
  }
}