@layer reset, tokens, base, components;

@layer reset {
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
}

@layer tokens {
  :root {
    --bg:        hsl(214, 100%, 5%);
    --surface:   hsl(215, 11%, 3%);
    --surface2:  hsl(214, 4%, 5%);
    --border:    hsl(214, 35%, 22%);
    --border2:   hsl(214, 10%, 25%);
    --text:      hsl(215, 25%, 85%);
    --text2:     hsl(215, 25%, 85%);
    --text3:     hsl(216, 15%, 60%);
    --accent:    hsl(22, 100%, 62%);
    --accent-soft: hsla(22, 100%, 62%, 0.08);
    --accent2:   hsl(22, 100%, 78%);
    --danger:    hsl(0, 100%, 71%);
    --pass-a:    hsl(41, 100%, 65%);
    --pass-aa:   hsl(153, 100%, 55%);
    --pass-aaa:  hsl(201, 100%, 65%);
    --mono:      'Courier New', Courier, monospace;
    --sans:      system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --radius:    0.625rem;
    --radius-sm: 0.375rem;
    --fs-xs:     0.9rem;
    --fs-sm:     1rem;
    --fs-base:   1rem;
    --fs-md:     1.125rem;
    --fs-xl:     3rem;
    --ls-tight:  0.02em;
    --ls-normal: 0.04em;
    --ls-wide:   0.06em;
  }
}

@layer base {
  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-size: var(--fs-base);
    line-height: 1.6;
    min-height: 100vh;
    padding: 1rem 0.75rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    transition: background 0.2s;
  }

  h1 {
    font-weight: 400;
    color: var(--accent);
  }

  main {
    display: grid;
    gap: 1rem;
  }

  @media (min-width: 640px) {
    body {
      padding: 1.4rem 1rem;
    }
  }
}

@layer components {
  .app {
    width: 100%;
    max-width: 65rem;
  }

  .generator {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }

  .generator:hover {
    border-color: var(--accent);
  }

  .generator__container {
    width: min(42rem, 100%);
    margin-inline: auto;
  }

  .info {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }

  .info__title {
    font-size: var(--fs-md);
    font-weight: 400;
    color: var(--accent);
  }

  .info__subtitle {
    font-size: var(--fs-sm);
    font-weight: 500;
    color: var(--text2);
    letter-spacing: var(--ls-normal);
    margin-top: 0.5rem;
  }

  .info__text {
    font-size: var(--fs-base);
    color: var(--text2);
  }

  .info__list {
    list-style: none;
    display: grid;
    gap: 0.4rem;
  }

  .info__item {
    font-size: var(--fs-base);
    color: var(--text2);
    padding-left: 1rem;
    position: relative;
  }

  .info__item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: var(--accent);
  }

  .info__item strong {
    color: var(--text);
    font-weight: 500;
  }

  .info code {
    font-family: var(--mono);
    font-size: var(--fs-xs);
    color: var(--accent2);
  }

  .info__steps {
    list-style: none;
    counter-reset: info-step;
    display: grid;
    gap: 0.4rem;
  }

  .info__step {
    counter-increment: info-step;
    color: var(--text2);
    position: relative;
    padding-left: 1.75rem;
  }

  .info__step::before {
    content: counter(info-step);
    position: absolute;
    left: 0;
    top: 0.05em;
    width: 1.1rem;
    height: 1.1rem;
    border-radius: 50%;
    background: var(--surface2);
    border: 1px solid var(--accent);
    color: var(--accent);
    font-family: var(--mono);
    font-size: var(--fs-xs);
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .generator__title {
    font-size: var(--fs-md);
    font-weight: 400;
    color: var(--accent);
  }

  .generator__row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .generator__row .btn {
    align-self: stretch;
  }

  .generator__output {
    flex: 1;
    min-width: 0;
    font-family: var(--mono);
    font-size: var(--fs-md);
    color: var(--text);
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.875rem 1rem;
    min-height: 3rem;
    display: flex;
    align-items: center;
    word-break: break-all;
    line-height: 1.5;
  }

  .copy-feedback {
    font-family: var(--mono);
    font-size: var(--fs-xs);
    color: var(--pass-aa);
    opacity: 0;
    transition: opacity 0.2s;
    min-height: 1rem;
  }

  .copy-feedback.is-visible {
    opacity: 1;
  }

  .generator__form {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.875rem;
  }

  .generator__form .btn {
    grid-column: 1 / -1;
  }

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

  .field__label {
    font-family: var(--mono);
    font-size: var(--fs-xs);
    color: var(--text3);
    letter-spacing: var(--ls-normal);
  }

  .field__row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .field__input {
    width: 5rem;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    padding: 0.5rem 0.75rem;
    font-family: var(--mono);
    font-size: var(--fs-base);
    outline: none;
    transition: border-color 0.2s;
  }

  .field__input:focus {
    border-color: var(--accent);
  }

  .field__range {
    flex: 1;
    min-width: 0;
    appearance: none;
    height: 0.25rem;
    background: var(--border);
    border-radius: 0.125rem;
    outline: none;
    cursor: pointer;
  }

  .field__range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg);
    cursor: pointer;
    transition: transform 0.1s;
  }

  .field__range::-webkit-slider-thumb:hover {
    transform: scale(1.2);
  }

  .field__range::-moz-range-thumb {
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg);
    cursor: pointer;
    transition: transform 0.1s;
  }

  .field__range::-moz-range-thumb:hover {
    transform: scale(1.2);
  }

  .toggle {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    cursor: pointer;
  }

  .toggle__input {
    display: none;
  }

  .toggle__track {
    width: 2.25rem;
    height: 1.25rem;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 1.25rem;
    position: relative;
    flex-shrink: 0;
    transition: background 0.2s, border-color 0.2s;
  }

  .toggle__track::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 0.875rem;
    height: 0.875rem;
    border-radius: 50%;
    background: var(--text3);
    transition: transform 0.2s, background 0.2s;
  }

  .toggle__input:checked + .toggle__track {
    background: var(--accent-soft);
    border-color: var(--accent);
  }

  .toggle__input:checked + .toggle__track::after {
    transform: translateX(1rem);
    background: var(--accent);
  }

  .toggle__label {
    font-family: var(--mono);
    font-size: var(--fs-sm);
    color: var(--accent);
  }

  .btn {
    font-family: var(--sans);
    font-size: var(--fs-sm);
    font-weight: 500;
    border: 2px solid var(--text);
    border-radius: var(--radius-sm);
    padding: 0.5rem 1.125rem;
    background: transparent;
    color: var(--text);
    cursor: pointer;
    transition: transform 0.1s, opacity 0.2s;
  }

  .btn:hover {
    transform: scale(1.03);
    opacity: 0.9;
  }

  .btn--accent {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
  }

  .footer {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-family: var(--mono);
    font-size: var(--fs-sm);
    color: var(--text3);
  }

  .footer__brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .footer__logo {
    display: block;
    width: 2rem;
    aspect-ratio: 1;
    border-radius: 100%;
  }

  .footer__name {
    color: var(--text2);
    font-weight: 500;
  }

  .footer__link {
    color: var(--text3);
    text-decoration: none;
    word-break: break-all;
    transition: color 0.2s;
  }

  .footer__link:hover {
    color: var(--accent);
  }

  @media (min-width: 640px) {
    .generator,
    .info {
      padding: 2rem 1.5rem;
    }

    .generator__form {
      grid-template-columns: repeat(4, 1fr);
      align-items: center;
    }

    .toggles {
      grid-template-columns: repeat(3, 1fr);
      grid-column: 1 / -1;
    }

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

    .footer {
      padding: 1.25rem 1.5rem;
    }
  }
}