@layer reset, tokens, base, components, utilities;

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

  html {
    font-size: clamp(16.5px, calc(16px + 0.12vw), 17.5px);
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
  }

  body,
  h1,
  h2,
  h3,
  p,
  figure {
    margin: 0;
  }

  button,
  input,
  textarea,
  select {
    font: inherit;
  }

  button,
  a {
    -webkit-tap-highlight-color: transparent;
  }
}

@layer tokens {
  :root {
    --paper: #f8f6f0;
    --paper-deep: #eeece4;
    --surface: #fcfbf8;
    --surface-soft: #f2f0e9;
    --ink: #292821;
    --ink-soft: #5f5d55;
    --ink-faint: #9d9a91;
    --line: rgba(42, 40, 33, 0.15);
    --line-strong: rgba(42, 40, 33, 0.26);
    --teal: #17666b;
    --teal-deep: #0f4c52;
    --teal-soft: #d5e4df;
    --blue-soft: #dce8ea;
    --sage: #8b9f88;
    --pink: #c88e82;
    --beige: #e7d6b7;
    --display: "Iowan Old Style", "Baskerville", "Songti SC", "YuMincho", "Noto Serif SC", "Noto Serif JP", Georgia, serif;
    --body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans", "Noto Sans SC", "Noto Sans JP", sans-serif;
    --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    --container: 1160px;
    --narrow: 760px;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;
    --radius-pill: 999px;
    --shadow-paper: 0 16px 38px rgba(42, 40, 33, 0.08);
    --shadow-card: 0 8px 24px rgba(42, 40, 33, 0.07);
    --ease: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  }

  [data-theme="dark"] {
    --paper: #1b1b18;
    --paper-deep: #22221e;
    --surface: #24241f;
    --surface-soft: #2a2a25;
    --ink: #ece9df;
    --ink-soft: #b7b4aa;
    --ink-faint: #7c7b72;
    --line: rgba(236, 233, 223, 0.14);
    --line-strong: rgba(236, 233, 223, 0.25);
    --teal: #75b5b0;
    --teal-deep: #a0d0c9;
    --teal-soft: #314844;
    --blue-soft: #314448;
    --sage: #a9bc9f;
    --pink: #e1a49b;
    --beige: #625642;
    --shadow-paper: 0 16px 38px rgba(0, 0, 0, 0.24);
    --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.2);
  }
}

@layer base {
  body {
    min-width: 320px;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--body);
    font-size: 1rem;
    line-height: 1.7;
    overflow-x: hidden;
  }

  body::before {
    position: fixed;
    z-index: -1;
    inset: 0;
    background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
    background-size: 56px 56px;
    content: "";
    opacity: 0.18;
    pointer-events: none;
    mask-image: linear-gradient(to bottom, black, transparent 34%);
  }

  [data-theme="dark"] body::before {
    opacity: 0.1;
  }

  ::selection {
    background: var(--teal-soft);
    color: var(--teal-deep);
  }

  a {
    color: inherit;
    text-decoration: none;
  }

  button {
    border: 0;
    cursor: pointer;
  }

  :focus-visible {
    outline: 2px solid var(--teal);
    outline-offset: 4px;
  }

  h1,
  h2,
  h3 {
    font-family: var(--display);
    font-weight: 500;
    letter-spacing: -0.035em;
    line-height: 1.08;
  }

  h1 em,
  h2 em {
    color: var(--teal);
    font-style: italic;
  }

  img {
    display: block;
    max-width: 100%;
  }
}

@layer components {
  .site-shell {
    position: relative;
    min-height: 100vh;
  }

  .container {
    width: min(var(--container), calc(100% - 48px));
    margin-inline: auto;
  }

  .section-pad {
    padding-block: clamp(5rem, 10vw, 9rem);
  }

  .site-header {
    position: sticky;
    z-index: 20;
    top: 0;
    border-bottom: 1px solid transparent;
    background: color-mix(in srgb, var(--paper) 88%, transparent);
    backdrop-filter: blur(18px);
    transition: border-color var(--ease), box-shadow var(--ease);
  }

  .site-header.is-scrolled {
    border-color: var(--line);
    box-shadow: 0 10px 24px color-mix(in srgb, var(--paper) 72%, transparent);
  }

  .header-inner {
    display: flex;
    min-height: 72px;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
  }

  .brand {
    display: inline-flex;
    align-items: baseline;
    gap: 9px;
    flex-shrink: 0;
  }

  .brand-mark {
    color: var(--teal);
    font-family: var(--display);
    font-size: 1.3rem;
    font-style: italic;
    letter-spacing: -0.08em;
  }

  .brand-name {
    color: var(--ink-soft);
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .main-nav {
    display: flex;
    align-items: center;
    gap: clamp(18px, 3vw, 36px);
  }

  .main-nav a,
  .text-link,
  .footer-top {
    color: var(--ink-soft);
    font-size: 0.86rem;
    font-weight: 650;
    transition: color var(--ease);
  }

  .main-nav a:hover,
  .text-link:hover,
  .footer-top:hover {
    color: var(--teal);
  }

  .header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .language-switcher {
    display: flex;
    gap: 2px;
    padding: 3px;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    background: var(--surface);
  }

  .language-button {
    min-width: 29px;
    padding: 5px 6px;
    border-radius: var(--radius-pill);
    background: transparent;
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 700;
    line-height: 1;
    transition: color var(--ease), background var(--ease);
  }

  .language-button:hover,
  .language-button.is-active {
    background: var(--teal-soft);
    color: var(--teal-deep);
  }

  .theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 7px 9px;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    background: var(--surface);
    color: var(--ink-soft);
    font-size: 0.74rem;
    font-weight: 650;
    transition: border-color var(--ease), color var(--ease);
  }

  .theme-toggle:hover {
    border-color: var(--teal);
    color: var(--teal);
  }

  .theme-toggle-dot {
    width: 8px;
    height: 8px;
    border: 1px solid currentColor;
    border-radius: 50%;
  }

  .hero {
    position: relative;
    min-height: min(780px, calc(100vh - 72px));
    display: grid;
    align-items: center;
    overflow: hidden;
  }

  .hero::after {
    position: absolute;
    z-index: -1;
    top: 8%;
    right: -8%;
    width: 420px;
    height: 420px;
    border: 1px solid var(--line);
    border-radius: 50%;
    content: "";
    opacity: 0.55;
  }

  .hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
    align-items: center;
    gap: clamp(42px, 7vw, 100px);
  }

  .hero-copy {
    position: relative;
    z-index: 1;
  }

  .eyebrow,
  .section-kicker,
  .step-overline,
  .art-note,
  .margin-note,
  .prototype-note {
    color: var(--teal);
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    line-height: 1.4;
    text-transform: uppercase;
  }

  .eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    margin-bottom: 22px;
  }

  .eyebrow-dot {
    width: 8px;
    height: 8px;
    border: 1px solid var(--teal);
    border-radius: 50%;
    box-shadow: inset 0 0 0 2px var(--paper);
    background: var(--teal);
  }

  .hero h1 {
    max-width: 10ch;
    font-size: clamp(3.25rem, 5.8vw, 5.65rem);
    letter-spacing: -0.055em;
    line-height: 1.02;
  }

  .hero-lede {
    max-width: 48ch;
    margin-top: 25px;
    color: var(--ink-soft);
    font-size: clamp(1.02rem, 1.08vw, 1.14rem);
    line-height: 1.78;
  }

  .hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    margin-top: 34px;
  }

  .button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    min-height: 44px;
    padding: 10px 18px;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    transition: transform var(--ease), border-color var(--ease), background var(--ease), color var(--ease), box-shadow var(--ease);
  }

  .button:hover {
    transform: translateY(-2px);
  }

  .button-primary {
    background: var(--teal);
    color: var(--paper);
    box-shadow: 0 8px 18px color-mix(in srgb, var(--teal) 22%, transparent);
  }

  .button-primary:hover {
    background: var(--teal-deep);
    color: var(--paper);
  }

  .button-quiet,
  .button-outline {
    border-color: var(--line-strong);
    background: transparent;
    color: var(--ink-soft);
  }

  .button-quiet:hover,
  .button-outline:hover {
    border-color: var(--teal);
    color: var(--teal);
  }

  .hero-proof {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 48px;
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 0.74rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }

  .proof-separator {
    color: var(--pink);
  }

  .hero-art {
    position: relative;
    min-width: 0;
  }

  .illustration-frame {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--line-strong);
    background: #fffefa;
    box-shadow: var(--shadow-paper);
  }

  .illustration-frame::after {
    position: absolute;
    inset: 9px;
    border: 1px dashed color-mix(in srgb, var(--line-strong) 68%, transparent);
    content: "";
    pointer-events: none;
  }

  .illustration-frame img {
    width: 100%;
    height: auto;
    mix-blend-mode: multiply;
  }

  [data-theme="dark"] .illustration-frame {
    background: #eee9dc;
  }

  .illustration-hero {
    transform: rotate(1.2deg);
    border-radius: 5px 22px 8px 18px;
  }

  .art-note {
    position: absolute;
    z-index: 1;
    padding: 7px 9px;
    border: 1px solid var(--line);
    background: var(--paper);
    color: var(--ink-faint);
    font-size: 0.58rem;
    letter-spacing: 0.08em;
  }

  .note-top {
    top: -20px;
    left: 12%;
    transform: rotate(-4deg);
  }

  .note-bottom {
    right: 7%;
    bottom: -17px;
    transform: rotate(3deg);
  }

  .hero-stamp {
    position: absolute;
    right: -20px;
    bottom: 12%;
    display: grid;
    width: 86px;
    height: 86px;
    place-content: center;
    border: 1px solid var(--pink);
    border-radius: 50%;
    color: var(--pink);
    font-family: var(--mono);
    font-size: 0.54rem;
    letter-spacing: 0.04em;
    line-height: 1.1;
    text-align: center;
    text-transform: uppercase;
    transform: rotate(9deg);
  }

  .hero-stamp strong {
    font-family: var(--display);
    font-size: 1.4rem;
    font-style: italic;
    font-weight: 500;
    letter-spacing: -0.08em;
  }

  .section-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 32px;
    margin-bottom: 42px;
  }

  .section-heading-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 20px;
  }

  .section-kicker {
    margin-bottom: 12px;
  }

  .section-heading h2,
  .lab-copy h2,
  .safety-copy h2,
  .about-notes h2,
  .membership-inner h2 {
    font-size: clamp(2.2rem, 4vw, 4.1rem);
  }

  .section-intro {
    max-width: 43ch;
    color: var(--ink-soft);
    font-size: 1.04rem;
    line-height: 1.75;
  }

  .text-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    white-space: nowrap;
  }

  .updates-trigger {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    min-height: 36px;
    padding: 7px 12px 7px 9px;
    border: 1px solid color-mix(in srgb, var(--teal) 34%, var(--line));
    border-radius: 999px;
    background: color-mix(in srgb, var(--teal-soft) 72%, var(--paper));
    color: var(--teal-deep);
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
  }

  .updates-trigger:hover,
  .updates-trigger:focus-visible {
    border-color: var(--teal);
    background: var(--teal-soft);
    transform: translateY(-2px);
  }

  .updates-trigger-mark {
    display: grid;
    width: 20px;
    height: 20px;
    place-items: center;
    border-radius: 50%;
    background: var(--teal);
    color: var(--paper);
    font-size: 0.72rem;
    line-height: 1;
  }

  .updates-trigger-count {
    color: var(--coral);
    font-weight: 700;
  }

  .path-section,
  .about-section {
    border-top: 1px solid var(--line);
  }

  .path-rail {
    position: relative;
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 18px;
  }

  .path-line {
    position: absolute;
    top: 28px;
    right: 8%;
    left: 8%;
    height: 1px;
    background: var(--line-strong);
    overflow: hidden;
  }

  .path-line::after {
    position: absolute;
    inset: 0 auto 0 0;
    width: var(--path-progress, 0%);
    background: linear-gradient(90deg, var(--teal), color-mix(in srgb, var(--teal) 54%, var(--sage)));
    content: "";
    transition: width 520ms cubic-bezier(0.22, 1, 0.36, 1);
  }

  .path-rail[data-active-level="0"] { --path-progress: 0%; }
  .path-rail[data-active-level="1"] { --path-progress: 25%; }
  .path-rail[data-active-level="2"] { --path-progress: 50%; }
  .path-rail[data-active-level="3"] { --path-progress: 75%; }
  .path-rail[data-active-level="4"] { --path-progress: 100%; }

  .step-body {
    transition: transform 360ms cubic-bezier(0.22, 1, 0.36, 1), opacity 260ms ease;
  }

  .path-step {
    position: relative;
    min-width: 0;
  }

  .step-marker {
    position: relative;
    z-index: 1;
    display: grid;
    width: 56px;
    height: 56px;
    place-items: center;
    margin-bottom: 26px;
    padding: 0;
    border: 1px solid color-mix(in srgb, var(--ink) 18%, transparent);
    border-radius: 50%;
    background:
      radial-gradient(circle at 32% 22%, color-mix(in srgb, white 72%, transparent), transparent 42%),
      color-mix(in srgb, var(--surface) 82%, transparent);
    color: var(--ink-soft);
    font-family: var(--mono);
    font-size: 0.76rem;
    font-weight: 700;
    box-shadow:
      inset 0 1px 0 color-mix(in srgb, white 70%, transparent),
      inset 0 -8px 18px color-mix(in srgb, var(--ink) 4%, transparent),
      0 7px 18px color-mix(in srgb, var(--ink) 8%, transparent);
    backdrop-filter: blur(14px) saturate(1.25);
    -webkit-backdrop-filter: blur(14px) saturate(1.25);
    overflow: visible;
    isolation: isolate;
    transform: translateZ(0);
    transition:
      transform 320ms cubic-bezier(0.22, 1, 0.36, 1),
      border-color 260ms ease,
      color 260ms ease,
      background 260ms ease,
      box-shadow 320ms cubic-bezier(0.22, 1, 0.36, 1);
  }

  .step-marker::before {
    position: absolute;
    z-index: -1;
    inset: 4px;
    border: 1px solid color-mix(in srgb, white 50%, transparent);
    border-radius: inherit;
    content: "";
    opacity: 0.72;
    pointer-events: none;
  }

  .step-marker::after {
    position: absolute;
    z-index: -2;
    inset: -9px;
    border: 1px solid color-mix(in srgb, var(--teal) 36%, transparent);
    border-radius: inherit;
    content: "";
    opacity: 0;
    pointer-events: none;
    transform: scale(0.82);
  }

  .step-marker:hover,
  .step-marker:focus-visible {
    border-color: color-mix(in srgb, var(--teal) 58%, var(--line));
    color: var(--teal-deep);
    box-shadow:
      inset 0 1px 0 color-mix(in srgb, white 78%, transparent),
      inset 0 -8px 18px color-mix(in srgb, var(--teal) 7%, transparent),
      0 10px 24px color-mix(in srgb, var(--teal) 14%, transparent);
    transform: translateY(-2px) scale(1.035);
  }

  .step-marker:active {
    transform: translateY(0) scale(0.94);
  }

  .path-step.is-current .step-marker {
    border-color: var(--teal);
    background:
      radial-gradient(circle at 30% 18%, color-mix(in srgb, white 78%, transparent), transparent 38%),
      linear-gradient(145deg, color-mix(in srgb, var(--teal-soft) 86%, white), color-mix(in srgb, var(--blue-soft) 62%, var(--surface)));
    color: var(--teal-deep);
    box-shadow:
      inset 0 1px 0 color-mix(in srgb, white 84%, transparent),
      inset 0 -10px 22px color-mix(in srgb, var(--teal) 10%, transparent),
      0 0 0 7px color-mix(in srgb, var(--teal-soft) 48%, transparent),
      0 13px 30px color-mix(in srgb, var(--teal) 18%, transparent);
    transform: translateY(-3px) scale(1.055);
  }

  .path-step.is-current .step-body {
    opacity: 1;
    transform: translateY(-3px);
  }

  .step-marker.is-activating::after {
    animation: marker-bloom 520ms cubic-bezier(0.22, 1, 0.36, 1);
  }

  @keyframes marker-bloom {
    0% { opacity: 0.52; transform: scale(0.78); }
    60% { opacity: 0.2; }
    100% { opacity: 0; transform: scale(1.38); }
  }

  .step-overline {
    margin-bottom: 11px;
    color: var(--ink-faint);
    font-size: 0.64rem;
    letter-spacing: 0.08em;
  }

  .step-body h3 {
    margin-bottom: 12px;
    font-family: var(--body);
    font-size: 1.22rem;
    font-weight: 700;
    letter-spacing: -0.025em;
  }

  .step-body p:not(.step-overline) {
    min-height: 86px;
    color: var(--ink-soft);
    font-size: 0.94rem;
    line-height: 1.76;
  }

  .courses-section {
    border-top: 1px solid var(--line);
    background: color-mix(in srgb, var(--paper-deep) 38%, var(--paper));
  }

  .courses-intro {
    max-width: 72ch;
    margin: -8px 0 32px;
  }

  .catalog-toolbar {
    display: grid;
    gap: 11px;
    margin-bottom: 12px;
    padding: 14px 0 17px;
    border-top: 1px dashed var(--line);
    border-bottom: 1px dashed var(--line);
  }

  .catalog-search {
    display: grid;
    grid-template-columns: 24px minmax(0, 1fr) auto;
    align-items: center;
    gap: 8px;
    max-width: 620px;
    padding: 4px 6px 4px 13px;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-pill);
    background: var(--surface);
    box-shadow: 0 8px 24px color-mix(in srgb, var(--ink) 5%, transparent);
  }

  .catalog-search-icon {
    color: var(--teal);
    font-family: var(--display);
    font-size: 1.35rem;
    line-height: 1;
  }

  .catalog-search input {
    min-width: 0;
    padding: 8px 0;
    border: 0;
    outline: 0;
    background: transparent;
    color: var(--ink);
    font: inherit;
    font-size: 0.9rem;
  }

  .catalog-search input::placeholder {
    color: var(--ink-faint);
  }

  .catalog-search button {
    width: 30px;
    height: 30px;
    border: 0;
    border-radius: 50%;
    background: var(--paper-deep);
    color: var(--ink-soft);
    font-size: 1rem;
  }

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

  .filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  .filter-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 13px;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    background: transparent;
    color: var(--ink-soft);
    font-size: 0.8rem;
    font-weight: 700;
    transition: border-color var(--ease), background var(--ease), color var(--ease);
  }

  .filter-button:hover,
  .filter-button.is-active {
    border-color: var(--teal);
    background: var(--teal-soft);
    color: var(--teal-deep);
  }

  .filter-button small {
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 0.64rem;
  }

  .catalog-source-note {
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 0.69rem;
    line-height: 1.6;
  }

  .course-category-block {
    margin-top: 42px;
  }

  .course-category-block:first-child {
    margin-top: 26px;
  }

  .category-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 17px;
    padding-bottom: 11px;
    border-bottom: 1px solid var(--line);
  }

  .category-overline {
    margin-bottom: 5px;
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 0.64rem;
    letter-spacing: 0.08em;
  }

  .category-heading h3 {
    font-family: var(--display);
    font-size: clamp(1.5rem, 2.4vw, 2.25rem);
    letter-spacing: -0.045em;
  }

  .category-count {
    color: var(--teal);
    font-family: var(--display);
    font-size: 1.7rem;
    font-style: italic;
  }

  .catalog-state {
    padding: 36px 0;
    color: var(--ink-soft);
    font-family: var(--mono);
    font-size: 0.8rem;
  }

  .catalog-state-error {
    color: var(--coral);
  }

  .course-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .course-card {
    position: relative;
    display: flex;
    min-height: 348px;
    flex-direction: column;
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--surface);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
  }

  .course-card::before {
    position: absolute;
    top: 0;
    right: 0;
    width: 78px;
    height: 78px;
    border-bottom: 1px solid color-mix(in srgb, var(--teal) 30%, transparent);
    border-left: 1px solid color-mix(in srgb, var(--teal) 30%, transparent);
    border-radius: 0 0 0 100%;
    background: var(--blue-soft);
    content: "";
    opacity: 0.55;
  }

  .course-card:hover {
    border-color: color-mix(in srgb, var(--teal) 46%, var(--line));
    box-shadow: 0 16px 34px color-mix(in srgb, var(--ink) 11%, transparent);
    transform: translateY(-4px);
  }

  .course-meta,
  .repo-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }

  .course-level {
    color: var(--teal);
  }

  .course-card h3 {
    position: relative;
    margin-top: 30px;
    font-family: var(--display);
    font-size: 1.65rem;
    letter-spacing: -0.045em;
    overflow-wrap: anywhere;
  }

  .course-card p {
    margin-top: 15px;
    color: var(--ink-soft);
    font-size: 0.94rem;
    line-height: 1.7;
  }

  .course-excerpt {
    min-height: 78px;
  }

  .course-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-top: 22px;
  }

  .course-tag {
    padding: 4px 8px;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    color: var(--ink-soft);
    font-family: var(--mono);
    font-size: 0.68rem;
  }

  .course-footer {
    display: flex;
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
    margin-top: auto;
    padding-top: 22px;
  }

  .course-source-label {
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 0.58rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }

  .course-footer code {
    max-width: 100%;
    color: var(--ink-soft);
    font-family: var(--mono);
    font-size: 0.58rem;
    line-height: 1.5;
    overflow-wrap: anywhere;
  }

  .course-feedback-button {
    align-self: flex-start;
    margin-top: 19px;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--teal-deep);
    font-size: 0.8rem;
    font-weight: 750;
  }

  .course-feedback-button:hover {
    color: var(--coral);
  }

  .course-outline {
    margin-top: 26px;
    border-top: 1px solid var(--line-strong);
  }

  .course-outline-group {
    border-bottom: 1px solid var(--line-strong);
  }

  .course-outline-heading {
    display: grid;
    grid-template-columns: 48px minmax(0, 1fr) auto 28px;
    align-items: center;
    gap: 16px;
    padding: 21px 8px;
    cursor: pointer;
    list-style: none;
    transition: background var(--ease), color var(--ease);
  }

  .course-outline-heading::-webkit-details-marker {
    display: none;
  }

  .course-outline-heading:hover {
    background: color-mix(in srgb, var(--teal-soft) 44%, transparent);
  }

  .course-outline-index {
    color: var(--coral);
    font-family: var(--display);
    font-size: 1.2rem;
    font-style: italic;
  }

  .course-outline-heading-copy {
    display: grid;
    gap: 4px;
  }

  .course-outline-heading-copy strong {
    font-family: var(--display);
    font-size: clamp(1.3rem, 2vw, 1.85rem);
    font-weight: 600;
    letter-spacing: -0.035em;
  }

  .course-outline-heading .category-count {
    min-width: 42px;
    color: var(--teal);
    font-size: 1.25rem;
    text-align: right;
  }

  .course-outline-chevron {
    color: var(--ink-faint);
    font-size: 1.25rem;
    text-align: center;
    transition: transform var(--ease), color var(--ease);
  }

  .course-outline-group[open] .course-outline-chevron {
    color: var(--teal);
    transform: rotate(180deg);
  }

  .course-outline-list {
    margin: 0 0 0 48px;
    padding: 0 0 6px;
    border-left: 1px solid color-mix(in srgb, var(--teal) 28%, var(--line));
    list-style: none;
  }

  .course-outline-list li {
    border-top: 1px solid var(--line);
  }

  .course-outline-item {
    display: grid;
    width: 100%;
    grid-template-columns: 42px minmax(0, 1fr) 92px 24px;
    align-items: center;
    gap: 14px;
    padding: 15px 12px 15px 18px;
    border: 0;
    background: transparent;
    color: var(--ink);
    text-align: left;
    transition: background var(--ease), padding-left var(--ease);
  }

  .course-outline-item:hover,
  .course-outline-item:focus-visible {
    padding-left: 24px;
    outline: 0;
    background: color-mix(in srgb, var(--surface) 76%, var(--teal-soft));
  }

  .course-outline-number {
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 0.68rem;
  }

  .course-outline-copy {
    display: grid;
    min-width: 0;
    gap: 5px;
  }

  .course-outline-copy strong {
    font-size: 0.98rem;
    font-weight: 760;
    letter-spacing: -0.015em;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .course-outline-copy > span {
    color: var(--ink-soft);
    font-size: 0.8rem;
    line-height: 1.5;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .course-outline-item time {
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 0.66rem;
    text-align: right;
  }

  .course-outline-arrow {
    color: var(--teal);
    font-size: 0.82rem;
    text-align: center;
    transition: transform var(--ease);
  }

  .course-outline-item:hover .course-outline-arrow {
    transform: translate(2px, -2px);
  }

  .category-more {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 9px 0 18px 66px;
    padding: 7px 11px;
    border: 0;
    border-bottom: 1px solid var(--teal);
    background: transparent;
    color: var(--teal-deep);
    font-size: 0.78rem;
    font-weight: 750;
  }

  .catalog-empty-state {
    margin-top: 24px;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }

  .dialog-open {
    overflow: hidden;
  }

  .updates-dialog {
    width: 100%;
    max-width: none;
    height: 100dvh;
    max-height: none;
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
    overflow: hidden;
  }

  .updates-dialog::backdrop {
    background: color-mix(in srgb, var(--ink) 42%, transparent);
    backdrop-filter: blur(4px);
  }

  .updates-panel {
    width: min(720px, calc(100% - 40px));
    max-height: min(780px, calc(100dvh - 40px));
    margin: 20px auto;
    padding: clamp(26px, 5vw, 52px);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-lg);
    background:
      linear-gradient(color-mix(in srgb, var(--surface) 95%, transparent), color-mix(in srgb, var(--surface) 95%, transparent)),
      repeating-linear-gradient(0deg, transparent 0 28px, color-mix(in srgb, var(--teal) 8%, transparent) 28px 29px);
    box-shadow: 0 28px 90px color-mix(in srgb, var(--ink) 26%, transparent);
    overflow-y: auto;
    animation: updates-panel-in 260ms cubic-bezier(0.22, 1, 0.36, 1);
  }

  @keyframes updates-panel-in {
    from { transform: translateY(18px) scale(0.985); opacity: 0; }
    to { transform: translateY(0) scale(1); opacity: 1; }
  }

  .updates-topline {
    display: flex;
    align-items: start;
    justify-content: space-between;
    gap: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--line);
  }

  .updates-topline .section-kicker {
    margin-bottom: 7px;
  }

  .updates-built {
    min-height: 1em;
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 0.68rem;
    line-height: 1.5;
  }

  .updates-panel h2 {
    max-width: 11ch;
    margin-top: 30px;
    font-family: var(--display);
    font-size: clamp(2.45rem, 6vw, 4.7rem);
    line-height: 0.98;
    letter-spacing: -0.06em;
  }

  .updates-intro {
    max-width: 52ch;
    margin-top: 20px;
    color: var(--ink-soft);
    font-size: 1rem;
    line-height: 1.75;
  }

  .updates-list {
    display: grid;
    gap: 0;
    margin-top: 30px;
    border-top: 1px solid var(--line-strong);
  }

  .updates-item {
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr) 18px;
    gap: 14px;
    width: 100%;
    padding: 16px 2px;
    border: 0;
    border-bottom: 1px solid var(--line);
    background: transparent;
    color: inherit;
    text-align: left;
    transition: padding 180ms ease, background 180ms ease;
  }

  .updates-item:hover,
  .updates-item:focus-visible {
    padding-inline: 9px;
    background: color-mix(in srgb, var(--teal-soft) 46%, transparent);
  }

  .updates-item-index {
    color: var(--coral);
    font-family: var(--mono);
    font-size: 0.69rem;
    line-height: 1.6;
  }

  .updates-item-copy {
    min-width: 0;
  }

  .updates-item-copy strong {
    display: block;
    overflow-wrap: anywhere;
    font-size: 1.04rem;
    line-height: 1.45;
  }

  .updates-item-meta {
    display: block;
    margin-top: 5px;
    color: var(--teal-deep);
    font-family: var(--mono);
    font-size: 0.68rem;
    line-height: 1.5;
  }

  .updates-item-summary {
    display: -webkit-box;
    margin-top: 7px;
    overflow: hidden;
    color: var(--ink-soft);
    font-size: 0.84rem;
    line-height: 1.55;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
  }

  .updates-item-arrow {
    align-self: center;
    color: var(--teal);
    font-size: 1rem;
  }

  .updates-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 11px;
    margin-top: 27px;
  }

  .course-dialog {
    width: 100%;
    max-width: none;
    height: 100dvh;
    max-height: none;
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
    overflow: hidden;
  }

  .course-dialog::backdrop {
    background: color-mix(in srgb, var(--ink) 48%, transparent);
    backdrop-filter: blur(4px);
  }

  .course-drawer {
    display: flex;
    width: min(620px, 92vw);
    min-height: 100%;
    margin-left: auto;
    flex-direction: column;
    padding: clamp(28px, 5vw, 58px);
    border-left: 1px solid var(--line-strong);
    background:
      linear-gradient(color-mix(in srgb, var(--surface) 94%, transparent), color-mix(in srgb, var(--surface) 94%, transparent)),
      repeating-linear-gradient(0deg, transparent 0 28px, color-mix(in srgb, var(--teal) 8%, transparent) 28px 29px);
    box-shadow: -24px 0 70px color-mix(in srgb, var(--ink) 22%, transparent);
    overflow-y: auto;
    animation: course-drawer-in 280ms cubic-bezier(0.22, 1, 0.36, 1);
  }

  @keyframes course-drawer-in {
    from { transform: translateX(44px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
  }

  .course-drawer-topline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--line);
  }

  .course-dialog-close {
    width: 38px;
    height: 38px;
    flex: 0 0 auto;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: var(--paper);
    color: var(--ink);
    font-size: 1.2rem;
    line-height: 1;
  }

  .course-drawer h2 {
    margin-top: clamp(28px, 5vw, 56px);
    font-family: var(--display);
    font-size: clamp(2.25rem, 4.5vw, 4.1rem);
    line-height: 1.06;
    letter-spacing: -0.055em;
    overflow-wrap: anywhere;
  }

  .course-drawer-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    margin-top: 24px;
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 0.69rem;
  }

  .course-drawer-meta > div {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 6px;
  }

  .course-member-gate {
    display: grid;
    gap: 15px;
    margin-top: 46px;
    padding: clamp(22px, 4vw, 34px);
    border: 1px solid color-mix(in srgb, var(--teal) 42%, var(--line));
    border-radius: 18px;
    background:
      linear-gradient(color-mix(in srgb, var(--teal-soft) 52%, var(--surface)), color-mix(in srgb, var(--teal-soft) 52%, var(--surface))),
      repeating-linear-gradient(135deg, transparent 0 18px, color-mix(in srgb, var(--teal) 8%, transparent) 18px 19px);
  }

  .course-member-gate .course-drawer-label {
    margin: 0;
  }

  .course-member-gate h3 {
    max-width: 17ch;
    font-family: var(--display);
    font-size: clamp(1.8rem, 3.3vw, 2.8rem);
    line-height: 1.05;
    letter-spacing: -0.045em;
  }

  .course-member-gate > p:not(.course-drawer-label) {
    max-width: 48ch;
    color: var(--ink-soft);
    font-size: 0.98rem;
    line-height: 1.8;
  }

  .course-member-gate .button {
    justify-self: start;
    margin-top: 3px;
  }

  .course-drawer-summary {
    margin-top: 48px;
    padding: 24px 0;
    border-top: 1px solid var(--line-strong);
    border-bottom: 1px solid var(--line-strong);
  }

  .course-drawer-label {
    margin-bottom: 13px;
    color: var(--coral);
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: 0.07em;
    text-transform: uppercase;
  }

  .course-drawer-summary > p:last-child {
    color: var(--ink-soft);
    font-size: 1rem;
    line-height: 1.9;
  }

  .course-drawer-source {
    display: grid;
    gap: 8px;
    margin-top: 25px;
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 0.61rem;
  }

  .course-drawer-source code {
    color: var(--ink-soft);
    line-height: 1.6;
    overflow-wrap: anywhere;
  }

  .course-drawer-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 11px;
    margin-top: auto;
    padding-top: 48px;
  }

  .lab-section {
    border-top: 1px solid var(--line);
  }

  .lab-grid,
  .safety-grid,
  .about-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: clamp(44px, 8vw, 110px);
  }

  .illustration-lab {
    transform: rotate(-1.2deg);
    border-radius: 24px 5px 20px 8px;
  }

  .margin-note {
    display: block;
    margin-top: 15px;
    color: var(--ink-faint);
    text-align: right;
    transform: rotate(-2deg);
  }

  .lab-copy h2,
  .safety-copy h2 {
    max-width: 11ch;
    margin-bottom: 24px;
  }

  .repo-list {
    display: grid;
    gap: 0;
    margin-block: 30px 28px;
    border-top: 1px solid var(--line);
  }

  .repo-item {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 18px;
    padding-block: 17px;
    border-bottom: 1px solid var(--line);
  }

  .repo-name {
    margin-bottom: 5px;
    color: var(--ink);
    font-family: var(--mono);
    font-size: 0.86rem;
    font-weight: 700;
  }

  .repo-description {
    color: var(--ink-soft);
    font-size: 0.86rem;
    line-height: 1.55;
  }

  .repo-meta {
    align-self: start;
    color: var(--teal);
    font-size: 0.66rem;
    text-align: right;
    white-space: nowrap;
  }

  .repo-language {
    color: var(--ink-faint);
  }

  .safety-section {
    border-top: 1px solid var(--line);
    background: var(--teal-soft);
  }

  .safety-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

  .safety-copy h2 {
    color: var(--teal-deep);
  }

  .safety-copy .section-intro {
    color: color-mix(in srgb, var(--teal-deep) 70%, var(--ink-soft));
  }

  .safety-points {
    display: grid;
    gap: 11px;
    margin-top: 30px;
  }

  .safety-point {
    display: flex;
    align-items: center;
    gap: 13px;
    color: var(--teal-deep);
    font-size: 0.91rem;
    font-weight: 700;
  }

  .point-number {
    color: color-mix(in srgb, var(--teal-deep) 55%, transparent);
    font-family: var(--mono);
    font-size: 0.69rem;
  }

  .illustration-safety {
    border-color: color-mix(in srgb, var(--teal-deep) 34%, transparent);
    border-radius: 8px 25px 9px 20px;
    box-shadow: 0 18px 34px color-mix(in srgb, var(--teal-deep) 12%, transparent);
    transform: rotate(1.4deg);
  }

  .about-card {
    position: relative;
    min-height: 340px;
    padding: 30px;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--surface);
    box-shadow: var(--shadow-card);
  }

  .about-avatar {
    display: grid;
    width: 62px;
    height: 62px;
    margin-block: 32px 18px;
    place-items: center;
    border: 1px solid var(--teal);
    border-radius: 50%;
    background: var(--teal-soft);
    color: var(--teal-deep);
    font-family: var(--display);
    font-size: 2rem;
    font-style: italic;
  }

  .about-name {
    font-family: var(--display);
    font-size: 1.7rem;
  }

  .about-role {
    margin-top: 3px;
    color: var(--teal);
    font-size: 0.83rem;
    font-weight: 700;
  }

  .about-copy {
    max-width: 40ch;
    margin-block: 17px 23px;
    color: var(--ink-soft);
    font-size: 0.95rem;
    line-height: 1.72;
  }

  .about-notes h2 {
    max-width: 8ch;
    margin-bottom: 25px;
  }

  .about-notes > p:not(.section-kicker) {
    max-width: 42ch;
    color: var(--ink-soft);
    font-size: 1rem;
    line-height: 1.8;
  }

  .about-metrics {
    display: flex;
    flex-wrap: wrap;
    gap: clamp(22px, 4vw, 52px);
    margin-top: 40px;
    padding-top: 21px;
    border-top: 1px solid var(--line);
  }

  .about-metrics div {
    display: grid;
    gap: 4px;
  }

  .about-metrics strong {
    color: var(--teal);
    font-family: var(--display);
    font-size: 1.85rem;
    font-style: italic;
    font-weight: 500;
  }

  .about-metrics span {
    color: var(--ink-faint);
    font-size: 0.74rem;
  }

  .membership-section {
    border-top: 1px solid var(--line);
  }

  .feedback-section {
    border-top: 1px solid var(--line);
    background: color-mix(in srgb, var(--paper-deep) 24%, var(--paper));
  }

  .feedback-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
    gap: clamp(44px, 8vw, 110px);
  }

  .feedback-copy h2 {
    max-width: 11ch;
    margin-bottom: 24px;
  }

  .feedback-note {
    max-width: 48ch;
    margin-top: 24px;
    padding-left: 15px;
    border-left: 2px solid var(--coral);
    color: var(--ink-faint);
    font-size: 0.81rem;
    line-height: 1.75;
  }

  .feedback-form {
    display: grid;
    gap: 16px;
    padding: clamp(22px, 4vw, 34px);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-lg);
    background: var(--surface);
    box-shadow: var(--shadow-card);
  }

  .feedback-form label {
    display: grid;
    gap: 7px;
    color: var(--ink-soft);
    font-size: 0.82rem;
    font-weight: 700;
  }

  .feedback-form input,
  .feedback-form select,
  .feedback-form textarea {
    width: 100%;
    padding: 11px 13px;
    border: 1px solid var(--line);
    border-radius: 10px;
    outline: none;
    background: var(--paper);
    color: var(--ink);
    font: inherit;
    font-size: 0.9rem;
    line-height: 1.55;
    transition: border-color var(--ease), box-shadow var(--ease);
  }

  .feedback-form textarea {
    min-height: 132px;
    resize: vertical;
  }

  .feedback-form input:focus,
  .feedback-form select:focus,
  .feedback-form textarea:focus {
    border-color: var(--teal);
    box-shadow: 0 0 0 3px var(--teal-soft);
  }

  .feedback-form .button {
    justify-self: start;
    margin-top: 4px;
  }

  .feedback-status {
    min-height: 1.3em;
    color: var(--teal-deep);
    font-size: 0.77rem;
    line-height: 1.5;
  }

  .membership-inner {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 40px;
    padding: clamp(32px, 5vw, 64px);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-lg);
    background: var(--surface-soft);
  }

  .membership-inner h2 {
    margin-bottom: 19px;
  }

  .membership-actions {
    display: grid;
    justify-items: start;
    gap: 13px;
    flex-shrink: 0;
  }

  .prototype-note {
    color: var(--ink-faint);
    font-size: 0.72rem;
    letter-spacing: 0.05em;
    text-transform: none;
  }

  .site-footer {
    border-top: 1px solid var(--line);
  }

  .footer-inner {
    display: flex;
    min-height: 98px;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    color: var(--ink-faint);
    font-size: 0.79rem;
  }

  .footer-inner > div {
    display: inline-flex;
    align-items: baseline;
    gap: 8px;
  }

  .footer-muted {
    color: var(--ink-faint);
    font-family: var(--mono);
    font-size: 0.69rem;
  }

  .toast {
    position: fixed;
    z-index: 40;
    right: 22px;
    bottom: 22px;
    max-width: min(360px, calc(100vw - 44px));
    padding: 12px 15px;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    background: var(--surface);
    box-shadow: var(--shadow-paper);
    color: var(--ink-soft);
    font-size: 0.86rem;
    opacity: 0;
    pointer-events: none;
    transform: translateY(8px);
    transition: opacity var(--ease), transform var(--ease);
  }

  .toast.is-visible {
    opacity: 1;
    transform: translateY(0);
  }
}

@layer utilities {
  .reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 650ms cubic-bezier(0.16, 1, 0.3, 1), transform 650ms cubic-bezier(0.16, 1, 0.3, 1);
  }

  .reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
  }

  .reveal-delay-1 {
    transition-delay: 90ms;
  }

  .reveal-delay-2 {
    transition-delay: 160ms;
  }

  .reveal-delay-3 {
    transition-delay: 230ms;
  }

  .reveal-delay-4 {
    transition-delay: 300ms;
  }

  @media (max-width: 980px) {
    .header-inner {
      gap: 16px;
    }

    .main-nav {
      gap: 17px;
    }

    .hero-grid {
      grid-template-columns: minmax(0, 1fr) minmax(330px, 0.92fr);
      gap: 42px;
    }

    .path-rail {
      grid-template-columns: repeat(3, minmax(0, 1fr));
      row-gap: 48px;
    }

    .path-line {
      display: none;
    }

    .course-grid {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }
  }

  @media (max-width: 720px) {
    .container {
      width: min(var(--container), calc(100% - 32px));
    }

    .site-header {
      position: relative;
    }

    .header-inner {
      min-height: auto;
      flex-wrap: wrap;
      padding-block: 13px 9px;
    }

    .brand {
      order: 1;
    }

    .header-actions {
      order: 2;
      margin-left: auto;
    }

    .main-nav {
      order: 3;
      width: 100%;
      gap: 20px;
      overflow-x: auto;
      padding-bottom: 2px;
      scrollbar-width: none;
    }

    .main-nav::-webkit-scrollbar {
      display: none;
    }

    .hero {
      min-height: auto;
      padding-top: 4.7rem;
    }

    .hero-grid,
    .lab-grid,
    .safety-grid,
    .about-grid,
    .feedback-grid {
      grid-template-columns: 1fr;
      gap: 48px;
    }

    .hero h1 {
      max-width: 9ch;
      font-size: clamp(2.85rem, 13vw, 4.65rem);
      line-height: 1.02;
    }

    .hero-art {
      width: calc(100% - 20px);
      margin-inline: auto;
    }

    .hero-stamp {
      right: -14px;
    }

    .section-heading {
      display: grid;
      align-items: start;
      gap: 19px;
      margin-bottom: 30px;
    }

    .section-heading-actions {
      justify-content: flex-start;
      gap: 14px;
    }

    .section-heading h2,
    .lab-copy h2,
    .safety-copy h2,
    .about-notes h2,
    .membership-inner h2,
    .feedback-copy h2 {
      font-size: clamp(2.3rem, 11vw, 3.8rem);
    }

    .path-rail {
      grid-template-columns: 1fr;
      gap: 27px;
    }

    .path-step {
      display: grid;
      grid-template-columns: 56px minmax(0, 1fr);
      gap: 18px;
    }

    .step-marker {
      margin-bottom: 0;
    }

    .step-body p:not(.step-overline) {
      min-height: auto;
    }

    .course-grid {
      grid-template-columns: 1fr;
    }

    .catalog-search {
      max-width: none;
    }

    .course-outline-heading {
      grid-template-columns: 36px minmax(0, 1fr) auto 22px;
      gap: 9px;
      padding: 18px 2px;
    }

    .course-outline-heading-copy strong {
      font-size: 1.24rem;
    }

    .course-outline-list {
      margin-left: 0;
      border-left: 0;
    }

    .course-outline-item {
      grid-template-columns: 32px minmax(0, 1fr) 22px;
      gap: 9px;
      padding: 14px 2px;
    }

    .course-outline-item:hover,
    .course-outline-item:focus-visible {
      padding-left: 7px;
    }

    .course-outline-copy strong {
      white-space: normal;
    }

    .course-outline-copy > span {
      display: -webkit-box;
      overflow: hidden;
      white-space: normal;
      -webkit-box-orient: vertical;
      -webkit-line-clamp: 2;
    }

    .course-outline-item time {
      display: none;
    }

    .category-more {
      margin-left: 0;
    }

    .course-drawer {
      width: 100%;
      padding: 26px 22px 34px;
      border-left: 0;
    }

    .updates-panel {
      width: calc(100% - 24px);
      max-height: calc(100dvh - 24px);
      margin: 12px auto;
      padding: 24px 18px 22px;
      border-radius: 22px;
    }

    .updates-panel h2 {
      font-size: clamp(2.45rem, 13vw, 3.8rem);
    }

    .updates-item {
      grid-template-columns: 28px minmax(0, 1fr) 16px;
      gap: 9px;
      padding-block: 14px;
    }

    .updates-actions {
      align-items: flex-start;
    }

    .course-drawer h2 {
      font-size: clamp(2.35rem, 12vw, 3.7rem);
    }

    .course-drawer-meta {
      align-items: flex-start;
      flex-direction: column;
    }

    .course-drawer-meta > div {
      justify-content: flex-start;
    }

    .course-drawer-actions {
      align-items: flex-start;
      flex-direction: column;
    }

    .lab-copy {
      order: -1;
    }

    .safety-copy h2,
    .lab-copy h2,
    .about-notes h2,
    .feedback-copy h2 {
      max-width: 10ch;
    }

    .membership-inner,
    .footer-inner {
      align-items: flex-start;
      flex-direction: column;
    }

    .membership-inner {
      padding: 30px 24px;
    }

    .footer-inner {
      justify-content: center;
      padding-block: 28px;
      text-align: center;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    html {
      scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
    }

    .reveal {
      opacity: 1;
      transform: none;
    }
  }
}

/* iOS 26-inspired Liquid Glass layer: soft depth, clear hierarchy, restrained motion. */
@layer ios26 {
  :root {
    --paper: #edf4f2;
    --paper-deep: #e2ecea;
    --surface: rgba(255, 255, 255, 0.58);
    --surface-soft: rgba(255, 255, 255, 0.42);
    --line: rgba(73, 102, 101, 0.16);
    --line-strong: rgba(73, 102, 101, 0.28);
    --glass-border: rgba(255, 255, 255, 0.78);
    --glass-highlight: rgba(255, 255, 255, 0.72);
    --shadow-paper: 0 24px 70px rgba(61, 91, 91, 0.13), 0 3px 10px rgba(61, 91, 91, 0.06);
    --shadow-card: 0 18px 44px rgba(61, 91, 91, 0.1), 0 2px 8px rgba(61, 91, 91, 0.05);
  }

  [data-theme="dark"] {
    --paper: #101c1d;
    --paper-deep: #16292a;
    --surface: rgba(31, 52, 53, 0.62);
    --surface-soft: rgba(40, 65, 65, 0.48);
    --line: rgba(210, 235, 230, 0.14);
    --line-strong: rgba(210, 235, 230, 0.27);
    --glass-border: rgba(225, 248, 242, 0.2);
    --glass-highlight: rgba(225, 248, 242, 0.14);
    --shadow-paper: 0 24px 70px rgba(0, 0, 0, 0.28), 0 3px 10px rgba(0, 0, 0, 0.18);
    --shadow-card: 0 18px 44px rgba(0, 0, 0, 0.22), 0 2px 8px rgba(0, 0, 0, 0.14);
  }

  body {
    background:
      radial-gradient(760px 500px at 92% -8%, color-mix(in srgb, var(--teal-soft) 78%, transparent), transparent 70%),
      radial-gradient(700px 520px at -12% 32%, color-mix(in srgb, var(--blue-soft) 64%, transparent), transparent 72%),
      var(--paper);
  }

  body::before {
    background-size: 72px 72px;
    opacity: 0.1;
    mask-image: linear-gradient(to bottom, black, transparent 42%);
  }

  body::after {
    position: fixed;
    z-index: -2;
    inset: 0;
    background:
      radial-gradient(380px 260px at 78% 38%, color-mix(in srgb, var(--pink) 16%, transparent), transparent 74%),
      radial-gradient(480px 340px at 20% 78%, color-mix(in srgb, var(--sage) 12%, transparent), transparent 76%);
    content: "";
    filter: blur(28px);
    opacity: 0.8;
    pointer-events: none;
  }

  .site-header {
    top: 14px;
    width: min(1240px, calc(100% - 32px));
    margin-inline: auto;
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    background: color-mix(in srgb, var(--surface) 78%, transparent);
    box-shadow: 0 16px 34px rgba(61, 91, 91, 0.08), inset 0 1px 0 var(--glass-highlight);
    backdrop-filter: blur(26px) saturate(1.32);
    -webkit-backdrop-filter: blur(26px) saturate(1.32);
  }

  .site-header.is-scrolled {
    border-color: color-mix(in srgb, var(--teal) 30%, var(--glass-border));
    box-shadow: 0 18px 42px rgba(61, 91, 91, 0.14), inset 0 1px 0 var(--glass-highlight);
  }

  .header-inner {
    width: min(var(--container), calc(100% - 36px));
    min-height: 66px;
  }

  .main-nav a,
  .language-switcher,
  .theme-toggle {
    border: 1px solid transparent;
    border-radius: 999px;
  }

  .main-nav a {
    padding: 7px 12px;
    transition: color var(--ease), background var(--ease), border-color var(--ease), transform var(--ease);
  }

  .main-nav a:hover,
  .main-nav a:focus-visible {
    border-color: var(--glass-border);
    background: color-mix(in srgb, var(--surface) 70%, transparent);
    color: var(--teal);
    transform: translateY(-1px);
  }

  .language-switcher,
  .theme-toggle {
    border-color: var(--glass-border);
    background: color-mix(in srgb, var(--surface) 64%, transparent);
    box-shadow: inset 0 1px 0 var(--glass-highlight);
    backdrop-filter: blur(14px) saturate(1.18);
    -webkit-backdrop-filter: blur(14px) saturate(1.18);
  }

  .theme-toggle {
    padding-inline: 11px;
  }

  .hero {
    min-height: min(820px, calc(100vh - 82px));
  }

  .hero::before {
    position: absolute;
    z-index: -1;
    top: 7%;
    left: 35%;
    width: 540px;
    height: 540px;
    border: 1px solid color-mix(in srgb, var(--glass-border) 84%, transparent);
    border-radius: 50%;
    box-shadow: inset 0 0 80px color-mix(in srgb, var(--teal-soft) 32%, transparent);
    content: "";
    opacity: 0.56;
  }

  .hero::after {
    border-color: color-mix(in srgb, var(--glass-border) 72%, transparent);
    box-shadow: 0 0 80px color-mix(in srgb, var(--blue-soft) 42%, transparent);
  }

  .eyebrow,
  .art-note,
  .hero-stamp,
  .margin-note {
    border-color: var(--glass-border);
    background: color-mix(in srgb, var(--surface) 70%, transparent);
    box-shadow: inset 0 1px 0 var(--glass-highlight), 0 8px 22px rgba(61, 91, 91, 0.08);
    backdrop-filter: blur(16px) saturate(1.25);
    -webkit-backdrop-filter: blur(16px) saturate(1.25);
  }

  .eyebrow {
    padding: 7px 12px 7px 9px;
    border: 1px solid var(--glass-border);
    border-radius: 999px;
  }

  .illustration-frame {
    border-color: var(--glass-border);
    border-radius: 28px;
    background: color-mix(in srgb, var(--surface) 74%, white);
    box-shadow: var(--shadow-paper), inset 0 1px 0 var(--glass-highlight);
    backdrop-filter: blur(18px) saturate(1.12);
    -webkit-backdrop-filter: blur(18px) saturate(1.12);
  }

  .illustration-frame::after {
    inset: 12px;
    border-color: color-mix(in srgb, var(--glass-border) 76%, var(--line-strong));
    border-radius: 20px;
  }

  .illustration-hero,
  .illustration-lab,
  .illustration-safety {
    transform: none;
  }

  .note-top,
  .note-bottom {
    border-radius: 999px;
  }

  .hero-stamp {
    border-radius: 50%;
  }

  .button {
    min-height: 48px;
    padding-inline: 20px;
    border-radius: 999px;
    box-shadow: inset 0 1px 0 var(--glass-highlight);
  }

  .button-primary {
    border-color: color-mix(in srgb, var(--teal) 66%, white);
    background: linear-gradient(145deg, color-mix(in srgb, var(--teal) 96%, white), var(--teal-deep));
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.34), 0 12px 24px color-mix(in srgb, var(--teal) 22%, transparent);
  }

  .button-primary:hover {
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.42), 0 16px 30px color-mix(in srgb, var(--teal) 28%, transparent);
  }

  .button-quiet,
  .button-outline {
    border-color: var(--glass-border);
    background: color-mix(in srgb, var(--surface) 64%, transparent);
    box-shadow: inset 0 1px 0 var(--glass-highlight), 0 8px 18px rgba(61, 91, 91, 0.06);
    backdrop-filter: blur(14px) saturate(1.2);
    -webkit-backdrop-filter: blur(14px) saturate(1.2);
  }

  .path-section,
  .courses-section,
  .lab-section,
  .about-section,
  .membership-section,
  .feedback-section {
    border-top-color: color-mix(in srgb, var(--glass-border) 70%, var(--line));
    background: transparent;
  }

  .path-rail {
    padding: 34px 30px 28px;
    border: 1px solid var(--glass-border);
    border-radius: 32px;
    background: color-mix(in srgb, var(--surface) 56%, transparent);
    box-shadow: var(--shadow-card), inset 0 1px 0 var(--glass-highlight);
    backdrop-filter: blur(22px) saturate(1.18);
    -webkit-backdrop-filter: blur(22px) saturate(1.18);
  }

  .step-marker {
    border-color: var(--glass-border);
    background:
      radial-gradient(circle at 30% 18%, rgba(255, 255, 255, 0.78), transparent 40%),
      color-mix(in srgb, var(--surface) 74%, transparent);
    box-shadow: inset 0 1px 0 var(--glass-highlight), inset 0 -8px 18px color-mix(in srgb, var(--ink) 4%, transparent), 0 10px 24px rgba(61, 91, 91, 0.1);
  }

  .path-step.is-current .step-marker {
    box-shadow: inset 0 1px 0 var(--glass-highlight), inset 0 -10px 22px color-mix(in srgb, var(--teal) 10%, transparent), 0 0 0 7px color-mix(in srgb, var(--teal-soft) 42%, transparent), 0 16px 32px color-mix(in srgb, var(--teal) 20%, transparent);
  }

  .catalog-toolbar,
  .feedback-form,
  .about-card,
  .membership-inner {
    border: 1px solid var(--glass-border);
    border-radius: 30px;
    background: color-mix(in srgb, var(--surface) 58%, transparent);
    box-shadow: var(--shadow-card), inset 0 1px 0 var(--glass-highlight);
    backdrop-filter: blur(22px) saturate(1.16);
    -webkit-backdrop-filter: blur(22px) saturate(1.16);
  }

  .catalog-toolbar {
    padding: 18px 20px 20px;
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
  }

  .catalog-search {
    border-color: var(--glass-border);
    background: color-mix(in srgb, var(--surface) 72%, transparent);
    box-shadow: inset 0 1px 0 var(--glass-highlight), 0 8px 24px rgba(61, 91, 91, 0.06);
    backdrop-filter: blur(16px) saturate(1.18);
    -webkit-backdrop-filter: blur(16px) saturate(1.18);
  }

  .filter-button,
  .updates-trigger,
  .course-tag {
    border-color: var(--glass-border);
    background: color-mix(in srgb, var(--surface) 48%, transparent);
    box-shadow: inset 0 1px 0 var(--glass-highlight);
    backdrop-filter: blur(12px) saturate(1.15);
    -webkit-backdrop-filter: blur(12px) saturate(1.15);
  }

  .filter-button:hover,
  .filter-button.is-active,
  .updates-trigger:hover,
  .updates-trigger:focus-visible {
    border-color: color-mix(in srgb, var(--teal) 52%, var(--glass-border));
    background: color-mix(in srgb, var(--teal-soft) 62%, var(--surface));
  }

  .course-category-block {
    padding: 20px 22px 12px;
    border: 1px solid var(--glass-border);
    border-radius: 30px;
    background: color-mix(in srgb, var(--surface) 48%, transparent);
    box-shadow: var(--shadow-card), inset 0 1px 0 var(--glass-highlight);
    backdrop-filter: blur(18px) saturate(1.12);
    -webkit-backdrop-filter: blur(18px) saturate(1.12);
  }

  .course-category-block:first-child {
    margin-top: 26px;
  }

  .course-outline {
    margin-top: 20px;
    border-top-color: color-mix(in srgb, var(--glass-border) 74%, var(--line));
  }

  .course-outline-heading:hover,
  .course-outline-item:hover,
  .course-outline-item:focus-visible,
  .updates-item:hover,
  .updates-item:focus-visible {
    background: color-mix(in srgb, var(--teal-soft) 44%, transparent);
  }

  .course-card {
    border-color: var(--glass-border);
    border-radius: 26px;
    background: color-mix(in srgb, var(--surface) 66%, transparent);
    box-shadow: var(--shadow-card), inset 0 1px 0 var(--glass-highlight);
    backdrop-filter: blur(18px) saturate(1.12);
    -webkit-backdrop-filter: blur(18px) saturate(1.12);
  }

  .course-card::before {
    background: color-mix(in srgb, var(--blue-soft) 70%, transparent);
  }

  .safety-section {
    padding-block: clamp(5rem, 10vw, 9rem);
    background: transparent;
  }

  .safety-grid {
    padding: clamp(28px, 5vw, 64px);
    border: 1px solid var(--glass-border);
    border-radius: 34px;
    background: color-mix(in srgb, var(--teal-soft) 54%, var(--surface));
    box-shadow: var(--shadow-card), inset 0 1px 0 var(--glass-highlight);
    backdrop-filter: blur(24px) saturate(1.18);
    -webkit-backdrop-filter: blur(24px) saturate(1.18);
  }

  .course-dialog::backdrop,
  .updates-dialog::backdrop {
    background: rgba(15, 35, 36, 0.28);
    backdrop-filter: blur(18px) saturate(1.18);
    -webkit-backdrop-filter: blur(18px) saturate(1.18);
  }

  .course-drawer,
  .updates-panel {
    border: 1px solid var(--glass-border);
    background:
      linear-gradient(color-mix(in srgb, var(--surface) 78%, transparent), color-mix(in srgb, var(--surface) 78%, transparent)),
      radial-gradient(420px 280px at 12% 8%, color-mix(in srgb, var(--teal-soft) 52%, transparent), transparent 72%);
    box-shadow: 0 30px 90px rgba(15, 35, 36, 0.22), inset 0 1px 0 var(--glass-highlight);
    backdrop-filter: blur(30px) saturate(1.28);
    -webkit-backdrop-filter: blur(30px) saturate(1.28);
  }

  .course-drawer {
    min-height: calc(100% - 36px);
    margin: 18px 18px 18px auto;
    border-radius: 30px;
  }

  .updates-panel {
    border-radius: 30px;
  }

  .course-member-gate {
    border-color: color-mix(in srgb, var(--teal) 42%, var(--glass-border));
    border-radius: 24px;
    background: color-mix(in srgb, var(--teal-soft) 52%, var(--surface));
    box-shadow: inset 0 1px 0 var(--glass-highlight);
  }

  .course-dialog-close,
  .toast {
    border-color: var(--glass-border);
    background: color-mix(in srgb, var(--surface) 70%, transparent);
    box-shadow: inset 0 1px 0 var(--glass-highlight), var(--shadow-card);
    backdrop-filter: blur(16px) saturate(1.2);
    -webkit-backdrop-filter: blur(16px) saturate(1.2);
  }

  .feedback-form input,
  .feedback-form select,
  .feedback-form textarea {
    border-color: var(--glass-border);
    background: color-mix(in srgb, var(--paper) 68%, var(--surface));
    box-shadow: inset 0 1px 0 var(--glass-highlight);
  }

  .reveal {
    transition-duration: 720ms;
  }

  @media (max-width: 720px) {
    .site-header {
      width: calc(100% - 20px);
      border-radius: 26px;
    }

    .header-inner {
      width: calc(100% - 24px);
    }

    .hero {
      min-height: auto;
    }

    .hero::before {
      top: 12%;
      left: 2%;
      width: 360px;
      height: 360px;
    }

    .path-rail {
      padding: 22px 18px;
      border-radius: 26px;
    }

    .catalog-toolbar,
    .feedback-form,
    .about-card,
    .membership-inner,
    .course-category-block,
    .safety-grid {
      border-radius: 26px;
    }

    .course-category-block {
      padding: 16px 14px 8px;
    }

    .course-drawer {
      width: calc(100% - 24px);
      min-height: calc(100% - 24px);
      margin: 12px;
      border-radius: 26px;
    }
  }
}