/* Registration for a course (/registrace): pick a date and leave a contact, then fill in billing details. */
@layer components {
  /* Where in the registration someone is, above the form: a bar under each step, filled up to the current one. */
  .registration-steps {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-block-end: calc(var(--space-block) * 1.25);
    list-style: none;
    font-size: 0.9rem;

    @media (max-width: 680px) {
      font-size: 0.8rem;
    }
  }

  .registration-steps__step {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    padding-block-end: 0.75rem;
    border-block-end: 3px solid var(--color-border);
    color: var(--color-subtle);

    small {
      font-size: var(--text-small);
      font-weight: 500;
      letter-spacing: 0.06em;
      text-transform: uppercase;
    }

    &[aria-current] {
      border-color: var(--color-accent);
      color: var(--color-ink);
      font-weight: 500;

      small {
        color: var(--color-accent-ink);
      }
    }
  }

  .registration-steps__step--done {
    border-color: var(--color-accent);
  }

  /* The form, and beside it on a wide screen what the course comes with. */
  .registration {
    display: grid;
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
    padding: var(--section-padding);
    padding-block: calc(var(--space-block) * 2.5) 80px;

    &:has(.registration-course) {
      grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    }

    &:not(:has(.registration-course)) {
      max-inline-size: 900px;
    }

    @media (max-width: 900px) {
      &:has(.registration-course) {
        grid-template-columns: minmax(0, 1fr);
      }
    }

    @media (max-width: 680px) {
      padding: 32px 20px 60px;
    }
  }

  .registration__form {
    display: flex;
    flex-direction: column;
    gap: calc(var(--space-block) * 2.25);
    padding: clamp(1.5rem, 4vw, 2.25rem);
    border-radius: var(--radius-card);
    background: var(--color-band);

    /* On a phone the parts stand on the page; only the finish keeps its panel. */
    @media (max-width: 680px) {
      padding: 0;
      background: none;
    }
  }

  .registration__part {
    display: flex;
    flex-direction: column;
    gap: var(--space-block);
  }

  .registration__heading {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem 0.75rem;
    color: var(--color-ink);
    font-size: 1.2rem;
    font-weight: 500;

    small {
      margin-inline-start: auto;
      color: var(--color-subtle);
      font-size: 0.8rem;
      font-weight: 300;
    }
  }

  /* Parts numbered, as on the "how it works" steps. */
  .registration__form--numbered {
    counter-reset: part;

    .registration__heading {
      counter-increment: part;

      &::before {
        content: counter(part);
        display: grid;
        place-items: center;
        inline-size: 2.25rem;
        block-size: 2.25rem;
        border: 1.5px solid var(--color-ink);
        border-radius: 50%;
        font-size: 1rem;
      }
    }
  }

  /* Nothing to register for: the apology alone, with room before the footer. */
  .registration-unavailable {
    padding-block-end: 120px;
  }

  .registration__dates {
    display: grid;
    gap: 0.75rem;
    container-type: inline-size;
  }

  .registration__fields {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
    gap: var(--space-block);
  }

  .registration__field {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;

    label {
      color: var(--color-ink);
      font-size: 0.9rem;
      font-weight: 500;
      cursor: pointer;
    }

    input,
    textarea {
      inline-size: 100%;
      padding: 11px 13px;
      border: 1px solid var(--color-border);
      border-radius: 8px;
      background: var(--color-canvas);
      color: var(--color-text);
      font: inherit;
      font-size: 0.95rem;

      &:focus {
        outline: none;
        border-color: var(--color-accent-ink);
        box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-accent) 40%, transparent);
      }
    }

    textarea {
      min-block-size: 7rem;
      resize: vertical;
    }
  }

  .registration__field--wide {
    grid-column: 1 / -1;
  }

  .registration__star {
    color: var(--color-error);
  }

  /* A field only bots fill in. */
  .registration__trap {
    display: none;
  }

  .registration__finish {
    display: flex;
    flex-direction: column;
    gap: var(--space-block);
    padding-block-start: calc(var(--space-block) * 1.5);
    border-block-start: 1px solid var(--color-border);

    @media (max-width: 680px) {
      padding: 1.5rem;
      border: 0;
      border-radius: var(--radius-card);
      background: var(--color-band);
    }
  }

  .registration__consent {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.9rem;
    line-height: 1.5;

    input {
      flex-shrink: 0;
      inline-size: 1.1rem;
      block-size: 1.1rem;
      margin-block-start: 0.15rem;
      accent-color: var(--color-accent-ink);
    }

    label {
      cursor: pointer;
    }

    a {
      text-decoration: underline;
      text-decoration-color: var(--color-accent);
      text-decoration-thickness: 2px;
      text-underline-offset: 3px;
    }
  }

  .registration__submit {
    inline-size: 100%;
    padding: 14px 28px;
    border: 0;
    border-radius: 10px;
    background-color: var(--color-accent);
    color: var(--color-ink);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: filter 0.2s;

    @media (any-hover: hover) {
      &:hover { filter: brightness(0.95); }
    }
  }

  /* One date to pick. A tile in a narrow column, a row where there's room; the picked one lifts off the page. */
  .registration-date {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "city   radio"
      "date   date"
      "place  place"
      "price  price";
    align-items: center;
    gap: 0.2rem 1rem;
    padding: 16px 18px;
    border: 1.5px solid var(--color-border);
    border-radius: 14px;
    background: var(--color-canvas);
    cursor: pointer;

    &:has(:checked) {
      border-color: var(--color-ink);
      box-shadow: var(--shadow-raised);
    }

    input {
      grid-area: radio;
      inline-size: 1.15rem;
      block-size: 1.15rem;
      margin: 0;
      accent-color: var(--color-ink);
    }

    @container (min-width: 520px) {
      grid-template-columns: auto minmax(0, 1fr) auto;
      grid-template-areas:
        "radio city  price"
        "radio date  price"
        "radio place price";
      column-gap: 1.1rem;
      border-color: transparent;
      background: var(--color-surface);

      &:has(:checked) {
        background: var(--color-canvas);
      }
    }
  }

  .registration-date__city {
    grid-area: city;
    color: var(--color-subtle);
    font-size: var(--text-small);
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }

  .registration-date__date {
    grid-area: date;
    color: var(--color-ink);
    font-size: 1.4rem;
    font-weight: 500;

    @container (min-width: 520px) {
      font-size: 1.1rem;
    }
  }

  .registration-date__place {
    grid-area: place;
    color: var(--color-subtle);
    font-size: 0.9rem;
  }

  .registration-date__price {
    grid-area: price;
    margin-block-start: 0.75rem;
    padding-block-start: 0.75rem;
    border-block-start: 1px solid var(--color-border);
    color: var(--color-subtle);
    font-size: 0.85rem;
    font-variant-numeric: tabular-nums;

    s {
      margin-inline-end: 0.3em;
    }

    strong {
      color: var(--color-ink);
      font-size: 1.15rem;
      font-weight: 500;
    }

    small {
      display: block;
      font-size: inherit;
    }

    @container (min-width: 520px) {
      margin: 0;
      padding: 0;
      border: 0;
      text-align: end;
      white-space: nowrap;
    }
  }

  /* What the course comes with, kept in view while the form scrolls past. */
  .registration-course {
    position: sticky;
    inset-block-start: 100px;
    display: flex;
    flex-direction: column;
    gap: calc(var(--space-block) * 1.25);
    padding: clamp(1.5rem, 4vw, 2rem);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);

    .form-guarantees {
      margin: 0;
    }

    @media (max-width: 900px) {
      position: static;
    }
  }

  .registration-course__rating {
    color: var(--color-subtle);
    font-size: 0.95rem;

    strong {
      color: var(--color-ink);
      font-weight: 500;
    }
  }

  .registration-course__help {
    padding-block-start: var(--space-block);
    border-block-start: 1px solid var(--color-border);
    font-size: 0.9rem;

    a {
      font-weight: 500;
    }
  }
}