@layer reset, tokens, base, components;

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

  .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }
}

@layer tokens {
  :root {
    --bg:        hsl(214, 100%, 3%);
    --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%);
    --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);
    min-height: 100vh;
    padding: 1.4rem 1rem;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }

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

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

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

  .eyebrow {
    font-family: var(--sans);
    font-size: var(--fs-base);
    color: var(--text3);
  }
}

@layer components {
  .hero, .footer {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
  }

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

  .hero__title {
    font-size: var(--fs-xl);
    line-height: 1.1;
    letter-spacing: var(--ls-tight);
    margin: 0.25rem 0 0.75rem;
  }

  .hero__text {
    color: var(--text);
    max-width: 48ch;
  }

  .demo__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
    padding: 1rem 0;
  }

  .demo__card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
  }

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

  .demo__tag {
    font-size: var(--fs-xs);
    padding: 2px 8px;
    border-radius: 99px;
    background: var(--surface2);
    color: var(--text3);
    border: 1px solid var(--border);
  }

  .demo__title {
    font-size: var(--fs-sm);
    font-weight: 500;
    color: var(--text);
    text-align: center;
  }

  .demo__desc {
    font-size: var(--fs-xs);
    color: var(--text3);
    text-align: center;
    line-height: 1.5;
  }

  .demo__btn {
    width: 52px;
    height: 52px;
    background: var(--surface2);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.2s, background 0.15s;
    position: relative;
    overflow: hidden;
  }

  .demo__btn:hover {
    border-color: var(--accent);
    background: var(--surface);
  }

  .demo__btn:active {
    transform: translateY(1px);
  }

  .demo__btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }

  .demo__lines {
    position: relative;
    width: 22px;
    height: 22px;
  }

  .demo__line {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transform-origin: center;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  }

  .demo__svg {
    width: 28px;
    height: 28px;
    overflow: visible;
  }

  .demo__svg-path {
    fill: none;
    stroke: var(--text);
    stroke-width: 2;
    stroke-linecap: round;
    transition: d 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s;
  }

  .demo__wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .demo__btn--t1 .demo__line,
  .demo__btn--t2 .demo__line,
  .demo__btn--t5 .demo__line {
    transition: transform 0.3s, opacity 0.3s;
  }

  .demo__btn--t1 .demo__line--l1,
  .demo__btn--t2 .demo__line--l1,
  .demo__btn--t5 .demo__line--l1 { transform: translate(-50%, calc(-50% - 7px)); }
  .demo__btn--t1 .demo__line--l2,
  .demo__btn--t2 .demo__line--l2,
  .demo__btn--t5 .demo__line--l2 { transform: translate(-50%, -50%); }
  .demo__btn--t1 .demo__line--l3,
  .demo__btn--t2 .demo__line--l3,
  .demo__btn--t5 .demo__line--l3 { transform: translate(-50%, calc(-50% + 7px)); }

  .demo__btn--t1.is-open .demo__line--l1,
  .demo__btn--t2.is-open .demo__line--l1,
  .demo__btn--t5.is-open .demo__line--l1 { transform: translate(-50%, -50%) rotate(45deg); }
  .demo__btn--t1.is-open .demo__line--l2,
  .demo__btn--t2.is-open .demo__line--l2,
  .demo__btn--t5.is-open .demo__line--l2 { opacity: 0; transform: translate(-50%, -50%) scaleX(0); }
  .demo__btn--t1.is-open .demo__line--l3,
  .demo__btn--t2.is-open .demo__line--l3,
  .demo__btn--t5.is-open .demo__line--l3 { transform: translate(-50%, -50%) rotate(-45deg); }

  .demo__btn--t2 .demo__line { transition: transform 0.45s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.2s; }

  .demo__btn--t4 .demo__line {
    transition: transform 0.3s, opacity 0.3s;
    transform-origin: 0% 50%;
  }
  .demo__btn--t4 .demo__line--l1 { transform: translate(-50%, calc(-50% - 6px)); }
  .demo__btn--t4 .demo__line--l2 { transform: translate(-50%, -50%); }
  .demo__btn--t4 .demo__line--l3 { transform: translate(-50%, calc(-50% + 6px)); }
  .demo__btn--t4.is-open .demo__line--l1 { transform: translate(-50%, -50%) rotate(45deg); }
  .demo__btn--t4.is-open .demo__line--l2 { opacity: 0; transform: translate(-50%, -50%) scaleX(0); }
  .demo__btn--t4.is-open .demo__line--l3 { transform: translate(-50%, -50%) rotate(-45deg); }

  .demo__btn--t5 .demo__line { transition: transform 0.35s, opacity 0.2s; }
  .demo__btn--t5.is-open .demo__wrap { transform: rotate(180deg); }

  .footer {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
  }

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

  .footer__logo {
    width: 1.75rem;
    height: 1.75rem;
    border-radius: var(--radius-sm);
    object-fit: cover;
  }

  .footer__name {
    font-weight: 600;
    letter-spacing: var(--ls-wide);
  }

  .footer__link {
    color: var(--text3);
    text-decoration: none;
    font-size: var(--fs-sm);
  }

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

  .doc {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
  }

  .doc__intro {
    color: var(--text);
    max-width: 60ch;
    padding: 1.5rem 1.5rem 0;
  }

  .doc__demo {
    display: flex;
    justify-content: center;
    padding: 1rem 1.5rem;
  }

  .doc__body {
    color: var(--text3);
    max-width: 65ch;
    line-height: 1.6;
    padding: 0 1.5rem 1.5rem;
  }

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

  .tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
  }

  .tabs__item {
    font-size: var(--fs-sm);
    font-weight: 500;
    letter-spacing: var(--ls-normal);
    color: var(--text3);
    padding: 0.875rem 1rem;
    cursor: pointer;
    border: none;
    border-bottom: 2px solid transparent;
    background: none;
    transition: color 0.15s, border-color 0.15s;
  }

  .tabs__item:hover { color: var(--text); }
  .tabs__item.is-active { color: var(--accent); border-bottom-color: var(--accent); }

  .tabs__panel { display: none; }
  .tabs__panel.is-active { display: block; }

  .code {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin: 0 1.5rem 0.75rem;
    transition: border-color 0.2s;
  }

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

  .code__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.625rem 1rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface2);
  }

  .code__header-text {
    font-size: var(--fs-sm);
    color: var(--text3);
    font-family: var(--mono);
  }

  .code__copy {
    background: var(--accent);
    color: var(--surface);
    border: 2px solid var(--accent);
    border-radius: var(--radius-sm);
    font-family: var(--sans);
    font-size: var(--fs-sm);
    font-weight: 600;
    letter-spacing: var(--ls-normal);
    padding: 0.4rem 1rem;
    cursor: pointer;
    transition: transform 0.1s, opacity 0.2s;
  }

  .code__copy:hover { transform: scale(1.03); opacity: 0.9; }
  .code__copy:active { transform: scale(0.98); }

  .code__pre {
    margin: 0;
    padding: 1rem 1.125rem;
    font-family: var(--mono);
    font-size: var(--fs-sm);
    line-height: 1.6;
    overflow-x: auto;
    color: var(--text);
    white-space: pre;
  }

  .tok-sel  { color: var(--accent2); }
  .tok-prop { color: var(--text); }
  .tok-val  { color: var(--pass-aaa); }
  .tok-comment { color: var(--text3); }

}

@media (prefers-reduced-motion: reduce) {
  .demo__line,
  .demo__svg-path,
  .demo__wrap,
  .demo__btn,
  .code__copy,
  .tabs__item,
  .code {
    transition: none !important;
  }
}

@media (max-width: 55rem) {
  .tabs {
    overflow-x: auto;
  }
  .tabs__item {
    white-space: nowrap;
  }
}