/* ==========================================================================
   SwiftShop.pl — Design System  ("Signal")
   --------------------------------------------------------------------------
   Hand-authored modern CSS. Zero runtime cost: no utility framework, no
   preprocessor, no build step. Uses only platform features that ship in
   every current engine:

     • CSS custom properties + @property (typed, animatable tokens)
     • Cascade layers (@layer) for deterministic specificity
     • prefers-color-scheme + [data-theme] overrides
     • Fluid type with clamp() and a 1.25 modular scale
     • Container queries for component-level responsiveness
     • :has() for parent-state styling
     • color-mix() for derived palette steps
     • View Transitions API hooks
     • Scroll-driven animation with @supports fallback
     • Logical properties (inline/block) for RTL-safety

   Why not Tailwind: the whole design surface is ~40 tokens and a dozen
   components. A utility layer would ship more CSS than this file and add a
   build dependency to a site whose entire value proposition is speed.
   ========================================================================== */

/* --------------------------------------------------------------------------
   0. SELF-HOSTED VARIABLE FONTS
   Real files, same origin, no third-party font CDN. Each family is split into
   a `latin` and a `latin-ext` subset so Polish (and other Central-European)
   diacritics — ą ć ę ł ń ó ś ź ż — are covered without shipping Cyrillic,
   Greek or Vietnamese glyphs to every visitor.
   Variable axis `wght` covers 100–900 in a single file per subset.
   -------------------------------------------------------------------------- */
@font-face {
  font-family: "Inter Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url("../fonts/inter-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191,
    U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Inter Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url("../fonts/inter-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF,
    U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020,
    U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: "Space Grotesk Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 300 700;
  src: url("../fonts/space-grotesk-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191,
    U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Space Grotesk Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 300 700;
  src: url("../fonts/space-grotesk-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF,
    U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020,
    U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: "JetBrains Mono Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url("../fonts/jetbrains-mono-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191,
    U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "JetBrains Mono Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url("../fonts/jetbrains-mono-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF,
    U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020,
    U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* Note: the CSS lives at /assets/css/swiftshop.css and fonts at
   /assets/fonts/, hence the ../fonts/ prefix above. */

/* --------------------------------------------------------------------------
   0b. TYPED CUSTOM PROPERTIES
   Registered with @property so they interpolate properly in animation and
   can be hard-switched by the theme toggle without a colour flash.
   -------------------------------------------------------------------------- */
@property --brand-h {
  syntax: "<number>";
  inherits: true;
  initial-value: 252;
}

@property --brand-s {
  syntax: "<percentage>";
  inherits: true;
  initial-value: 100%;
}

@property --glow {
  syntax: "<number>";
  inherits: false;
  initial-value: 0;
}

/* --------------------------------------------------------------------------
   1. LAYERS
   -------------------------------------------------------------------------- */
@layer reset, tokens, base, layout, components, pages, utilities;

/* ==========================================================================
   2. RESET
   ========================================================================== */
@layer reset {
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }

  * {
    margin: 0;
  }

  html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
    scrollbar-gutter: stable;
  }

  body {
    min-block-size: 100svh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
  }

  img,
  picture,
  svg,
  video {
    display: block;
    max-inline-size: 100%;
    block-size: auto;
  }

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

  button {
    background: none;
    border: 0;
    cursor: pointer;
  }

  a {
    color: inherit;
  }

  h1,
  h2,
  h3,
  h4 {
    line-height: 1.1;
    text-wrap: balance;
    overflow-wrap: break-word;
  }

  p {
    text-wrap: pretty;
  }

  ul[class],
  ol[class] {
    list-style: none;
    padding: 0;
  }

  :focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 3px;
    border-radius: 4px;
  }

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

    *,
    *::before,
    *::after {
      animation-duration: 0.001ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.001ms !important;
      scroll-behavior: auto !important;
    }
  }
}

/* ==========================================================================
   3. TOKENS
   ========================================================================== */
@layer tokens {
  :root {
    /* --- Brand ramp, derived from one hue so retheming is a 1-line change */
    --h: 252;
    --brand-50: oklch(97% 0.02 var(--h));
    --brand-100: oklch(94% 0.04 var(--h));
    --brand-200: oklch(88% 0.07 var(--h));
    --brand-300: oklch(80% 0.11 var(--h));
    --brand-400: oklch(70% 0.16 var(--h));
    --brand-500: oklch(60% 0.20 var(--h));
    --brand-600: oklch(52% 0.21 var(--h));
    --brand-700: oklch(44% 0.185 var(--h));
    --brand-900: oklch(28% 0.11 var(--h));

    --accent: oklch(82% 0.15 178);
    --accent-deep: oklch(58% 0.13 183);
    --warm: oklch(74% 0.17 48);
    --gold: oklch(84% 0.15 88);
    --danger: oklch(64% 0.21 25);

    /* --- Typography ------------------------------------------------------ */
    --font-sans: "Inter Variable", "Inter", system-ui, -apple-system,
      "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-display: "Space Grotesk Variable", "Space Grotesk", var(--font-sans);
    --font-mono: "JetBrains Mono Variable", "JetBrains Mono", ui-monospace,
      "SFMono-Regular", Menlo, Consolas, monospace;

    /* Modular scale, ratio 1.25, fluid between 380px and 1440px */
    --step--2: clamp(0.694rem, 0.68rem + 0.07vw, 0.72rem);
    --step--1: clamp(0.833rem, 0.81rem + 0.11vw, 0.875rem);
    --step-0: clamp(1rem, 0.97rem + 0.14vw, 1.0625rem);
    --step-1: clamp(1.2rem, 1.15rem + 0.24vw, 1.3125rem);
    --step-2: clamp(1.44rem, 1.36rem + 0.4vw, 1.6875rem);
    --step-3: clamp(1.728rem, 1.6rem + 0.64vw, 2.125rem);
    --step-4: clamp(2.074rem, 1.87rem + 1vw, 2.75rem);
    --step-5: clamp(2.488rem, 2.16rem + 1.6vw, 3.5625rem);
    --step-6: clamp(2.986rem, 2.44rem + 2.7vw, 4.75rem);

    --lead: 1.05em;

    /* --- Space ----------------------------------------------------------- */
    --space-3xs: 0.25rem;
    --space-2xs: 0.5rem;
    --space-xs: 0.75rem;
    --space-s: 1rem;
    --space-m: 1.5rem;
    --space-l: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4.5rem;
    --space-3xl: 7rem;
    --gutter: clamp(1.25rem, 4vw, 2.5rem);
    --measure: 68ch;
    --page-max: 78rem;

    /* --- Radii & motion -------------------------------------------------- */
    --radius-xs: 6px;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 34px;
    --radius-pill: 999px;

    /* Framer-Motion-compatible easing: these are the exact cubic-bezier
       values Motion's named easings resolve to, so CSS and JS agree. */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --dur-fast: 140ms;
    --dur: 260ms;
    --dur-slow: 520ms;

    --z-nav: 100;
    --z-overlay: 200;
  }

  /* ---------------- Dark theme (default) ---------------- */
  :root,
  [data-theme="dark"] {
    color-scheme: dark;

    --bg: #06060b;
    --bg-deep: #04040a;
    --surface: #0e0e18;
    --surface-raised: #16162a;
    --line: rgb(255 255 255 / 9%);
    --line-strong: rgb(255 255 255 / 18%);
    --fg: #f3f3f8;
    --fg-muted: #a6a6bd;
    --fg-faint: #6f6f8a;
    --glass: rgb(20 20 38 / 62%);
    --glass-hi: rgb(255 255 255 / 6%);
    --focus: var(--accent);
    --shadow-1: 0 1px 2px rgb(0 0 0 / 40%), 0 8px 24px -12px rgb(0 0 0 / 70%);
    --shadow-2: 0 24px 70px -28px rgb(0 0 0 / 90%), 0 2px 6px rgb(0 0 0 / 50%);
    --hero-veil: radial-gradient(
      120% 80% at 50% -10%,
      rgb(88 70 255 / 34%) 0%,
      transparent 62%
    );
    --grid-line: rgb(255 255 255 / 4%);
    --code-bg: #0a0a14;
  }

  /* ---------------- Light theme ---------------- */
  [data-theme="light"] {
    color-scheme: light;

    --bg: #fbfaff;
    --bg-deep: #f2f0fc;
    --surface: #ffffff;
    --surface-raised: #ffffff;
    --line: rgb(16 14 45 / 9%);
    --line-strong: rgb(16 14 45 / 18%);
    --fg: #0d0b20;
    --fg-muted: #55526f;
    --fg-faint: #837f9c;
    --glass: rgb(255 255 255 / 72%);
    --glass-hi: rgb(16 14 45 / 3%);
    --focus: var(--brand-600);
    --shadow-1: 0 1px 2px rgb(24 18 70 / 6%), 0 8px 24px -14px rgb(24 18 70 / 18%);
    --shadow-2: 0 26px 70px -30px rgb(24 18 70 / 28%), 0 2px 6px rgb(24 18 70 / 6%);
    --hero-veil: radial-gradient(
      120% 80% at 50% -10%,
      rgb(120 105 255 / 22%) 0%,
      transparent 62%
    );
    --grid-line: rgb(16 14 45 / 5%);
    --code-bg: #f4f3fd;
  }

  [data-theme="light"] .ss-logo__plate {
    box-shadow: 0 6px 18px -8px rgb(60 40 200 / 45%);
  }
}

/* ==========================================================================
   4. BASE
   ========================================================================== */
@layer base {
  body {
    background-color: var(--bg);
    color: var(--fg);
    font-family: var(--font-sans);
    font-size: var(--step-0);
    font-synthesis-weight: none;
    font-feature-settings: "cv05" 1, "cv08" 1, "ss03" 1;
    overflow-x: clip;
  }

  /* Ambient aurora + engineering grid, painted behind everything and
     completely inert to input and to assistive tech. */
  body::before,
  body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -1;
  }

  body::before {
    background-image: var(--hero-veil);
  }

  body::after {
    background-image: linear-gradient(var(--grid-line) 1px, transparent 1px),
      linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 72px 72px;
    mask-image: radial-gradient(88% 62% at 50% 4%, #000 0%, transparent 78%);
    opacity: 0.9;
  }

  h1,
  h2,
  h3,
  h4,
  h5 {
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: -0.022em;
  }

  h1 {
    font-size: var(--step-5);
    letter-spacing: -0.035em;
  }

  h2 {
    font-size: var(--step-4);
    letter-spacing: -0.03em;
  }

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

  h4 {
    font-size: var(--step-1);
    font-weight: 600;
  }

  strong,
  b {
    font-weight: 640;
    color: var(--fg);
  }

  code,
  kbd,
  samp {
    font-family: var(--font-mono);
    font-size: 0.9em;
    font-feature-settings: "ss19" 1, "zero" 1;
  }

  :not(pre) > code {
    background: color-mix(in oklab, var(--brand-500) 16%, transparent);
    border: 1px solid color-mix(in oklab, var(--brand-400) 26%, transparent);
    border-radius: var(--radius-xs);
    padding: 0.12em 0.42em;
  }

  ::selection {
    background: color-mix(in oklab, var(--brand-400) 42%, transparent);
    color: var(--fg);
  }

  hr {
    border: 0;
    border-block-start: 1px solid var(--line);
    margin-block: var(--space-xl);
  }

  /* Anchor targets must clear the sticky header */
  :target {
    scroll-margin-block-start: calc(var(--header-h, 68px) + 1.5rem);
  }

  .ss-skip {
    position: absolute;
    inset-inline-start: -9999px;
    inset-block-start: 0;
    z-index: 999;
    padding: 0.85rem 1.25rem;
    background: var(--brand-600);
    color: #fff;
    font-weight: 600;
    border-radius: 0 0 var(--radius-sm) 0;
  }

  .ss-skip:focus {
    inset-inline-start: 0;
  }
}

/* ==========================================================================
   5. LAYOUT PRIMITIVES
   ========================================================================== */
@layer layout {
  .ss-shell {
    inline-size: min(100% - (var(--gutter) * 2), var(--page-max));
    margin-inline: auto;
  }

  .ss-shell--narrow {
    --page-max: 56rem;
  }

  .ss-shell--wide {
    --page-max: 90rem;
  }

  .ss-section {
    padding-block: clamp(3.5rem, 8vw, var(--space-3xl));
    position: relative;
  }

  .ss-section--tight {
    padding-block: clamp(2.5rem, 5vw, 4rem);
  }

  .ss-section--edge {
    border-block-start: 1px solid var(--line);
  }

  .ss-flow > * + * {
    margin-block-start: var(--space-s);
  }

  .ss-flow-l > * + * {
    margin-block-start: var(--space-m);
  }

  .ss-auto-grid {
    display: grid;
    gap: var(--space-m);
    grid-template-columns: repeat(auto-fit, minmax(min(17rem, 100%), 1fr));
  }

  .ss-auto-grid--2 {
    grid-template-columns: repeat(auto-fit, minmax(min(24rem, 100%), 1fr));
  }

  .ss-split {
    display: grid;
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
    grid-template-columns: 1fr;
  }

  @media (min-width: 62rem) {
    .ss-split {
      grid-template-columns: 1.05fr 0.95fr;
    }

    .ss-split--reverse > :first-child {
      order: 2;
    }
  }

  .ss-stack-s {
    display: flex;
    flex-direction: column;
    gap: var(--space-s);
  }

  .ss-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-s);
    align-items: center;
  }

  .ss-row--between {
    justify-content: space-between;
  }

  .ss-prose {
    max-inline-size: var(--measure);
    color: var(--fg-muted);
    font-size: var(--step-0);
    line-height: 1.7;
  }

  .ss-prose--lead {
    font-size: var(--step-1);
    line-height: var(--lead);
    color: var(--fg-muted);
  }

  .ss-prose > * + * {
    margin-block-start: var(--space-s);
  }

  .ss-prose h3 {
    color: var(--fg);
    margin-block-start: var(--space-l);
  }

  .ss-prose h4 {
    color: var(--fg);
    margin-block-start: var(--space-m);
  }

  .ss-prose ul,
  .ss-prose ol {
    padding-inline-start: 1.25em;
    display: grid;
    gap: var(--space-2xs);
  }

  .ss-prose li::marker {
    color: var(--brand-400);
  }

  .ss-prose a {
    color: var(--fg);
    text-decoration-color: var(--brand-400);
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
  }

  .ss-prose a:hover {
    text-decoration-color: var(--accent);
  }

  .ss-center {
    text-align: center;
    margin-inline: auto;
  }
}

/* ==========================================================================
   6. COMPONENTS
   ========================================================================== */
@layer components {
  /* ---------------- 6.1 Logo ---------------- */
  .ss-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-display);
    font-size: var(--step-1);
    font-weight: 700;
    letter-spacing: -0.03em;
    text-decoration: none;
    color: var(--fg);
    border-radius: var(--radius-sm);
  }

  .ss-logo__plate {
    inline-size: 2.375rem;
    block-size: 2.375rem;
    border-radius: 32%;
    flex: none;
    transition: transform var(--dur) var(--ease-spring);
  }

  .ss-logo:hover .ss-logo__plate {
    transform: rotate(-6deg) scale(1.06);
  }

  .ss-logo__word {
    display: inline-flex;
    align-items: baseline;
    gap: 0.34rem;
  }

  .ss-logo__tld {
    font-family: var(--font-mono);
    font-size: 0.62em;
    font-weight: 500;
    color: var(--fg-faint);
    letter-spacing: 0;
  }

  .ss-logo--footer {
    font-size: var(--step-2);
  }

  .ss-logo--footer .ss-logo__plate {
    inline-size: 3rem;
    block-size: 3rem;
  }

  /* ---------------- 6.2 Buttons ---------------- */
  .ss-btn {
    --btn-bg: var(--brand-600);
    --btn-fg: #fff;
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.78rem 1.4rem;
    min-block-size: 2.9rem;
    font-family: var(--font-sans);
    font-size: var(--step--1);
    font-weight: 620;
    letter-spacing: -0.005em;
    line-height: 1;
    text-decoration: none;
    color: var(--btn-fg);
    background: var(--btn-bg);
    border-radius: var(--radius-pill);
    border: 1px solid transparent;
    transition: transform var(--dur-fast) var(--ease-out),
      box-shadow var(--dur) var(--ease-out), background-color var(--dur) ease,
      border-color var(--dur) ease;
    box-shadow: var(--shadow-1);
    isolation: isolate;
    white-space: nowrap;
  }

  .ss-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 34px -14px color-mix(in oklab, var(--btn-bg) 75%, #000);
  }

  .ss-btn:active {
    transform: translateY(0) scale(0.985);
  }

  .ss-btn--primary {
    background-image: linear-gradient(
      100deg,
      var(--brand-600) 0%,
      var(--brand-500) 45%,
      color-mix(in oklab, var(--accent-deep) 62%, var(--brand-500)) 100%
    );
    background-size: 160% 100%;
    background-position: 0% 50%;
    transition: background-position var(--dur-slow) var(--ease-out),
      transform var(--dur-fast) var(--ease-out), box-shadow var(--dur) ease;
  }

  .ss-btn--primary:hover {
    background-position: 100% 50%;
  }

  .ss-btn--ghost {
    --btn-bg: transparent;
    --btn-fg: var(--fg);
    border-color: var(--line-strong);
    backdrop-filter: blur(12px);
  }

  .ss-btn--ghost:hover {
    background-color: var(--glass-hi);
    border-color: color-mix(in oklab, var(--brand-400) 55%, transparent);
    box-shadow: var(--shadow-1);
  }

  .ss-btn--lg {
    padding: 1rem 1.9rem;
    min-block-size: 3.4rem;
    font-size: var(--step-0);
  }

  .ss-btn--sm {
    padding: 0.55rem 0.95rem;
    min-block-size: 2.35rem;
    font-size: var(--step--2);
  }

  .ss-btn__icon {
    inline-size: 1em;
    block-size: 1em;
    flex: none;
  }

  .ss-link-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 600;
    font-size: var(--step--1);
    text-decoration: none;
    color: var(--brand-400);
    border-block-end: 1px solid transparent;
    transition: gap var(--dur) var(--ease-out), color var(--dur) ease;
  }

  .ss-link-cta:hover {
    gap: 0.75rem;
    color: var(--accent);
  }

  /* ---------------- 6.3 Header / navigation ---------------- */
  .ss-header {
    position: sticky;
    inset-block-start: 0;
    z-index: var(--z-nav);
    background: var(--glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-block-end: 1px solid transparent;
    transition: border-color var(--dur) ease, box-shadow var(--dur) ease;
  }

  .ss-header:has(+ *) {
    --header-h: 68px;
  }

  .ss-header[data-stuck="true"] {
    border-block-end-color: var(--line);
    box-shadow: 0 12px 40px -30px rgb(0 0 0 / 80%);
  }

  .ss-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-m);
    min-block-size: var(--header-h, 68px);
  }

  .ss-nav {
    display: none;
  }

  @media (min-width: 60rem) {
    .ss-nav {
      display: flex;
      align-items: center;
      gap: 0.15rem;
    }
  }

  .ss-nav__link {
    position: relative;
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 0.8rem;
    border-radius: var(--radius-pill);
    font-size: var(--step--1);
    font-weight: 520;
    color: var(--fg-muted);
    text-decoration: none;
    transition: color var(--dur) ease, background-color var(--dur) ease;
  }

  .ss-nav__link:hover {
    color: var(--fg);
    background-color: var(--glass-hi);
  }

  .ss-nav__link[aria-current="page"] {
    color: var(--fg);
  }

  .ss-nav__link[aria-current="page"]::after {
    content: "";
    position: absolute;
    inset-inline: 0.8rem;
    inset-block-end: 0.12rem;
    block-size: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--brand-400), var(--accent));
  }

  .ss-header__tools {
    display: flex;
    align-items: center;
    gap: 0.4rem;
  }

  /* Language switch: a real segmented control of real <a> elements, so it
     is crawlable and works with JS disabled. */
  .ss-lang {
    display: inline-flex;
    align-items: center;
    padding: 3px;
    gap: 2px;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    background: var(--glass-hi);
  }

  .ss-lang__opt {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.34rem 0.6rem;
    border-radius: var(--radius-pill);
    font-size: var(--step--2);
    font-weight: 640;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    text-decoration: none;
    color: var(--fg-muted);
    transition: color var(--dur) ease, background-color var(--dur) ease;
  }

  .ss-lang__opt:hover {
    color: var(--fg);
  }

  .ss-lang__opt[aria-current="true"] {
    color: var(--fg);
    background: color-mix(in oklab, var(--brand-500) 30%, transparent);
    box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--brand-300) 30%, transparent);
  }

  .ss-lang__flag {
    font-size: 0.95em;
    line-height: 1;
  }

  .ss-theme-toggle,
  .ss-menu-toggle {
    display: inline-grid;
    place-items: center;
    inline-size: 2.35rem;
    block-size: 2.35rem;
    border-radius: var(--radius-pill);
    border: 1px solid var(--line);
    color: var(--fg-muted);
    background: var(--glass-hi);
    transition: color var(--dur) ease, border-color var(--dur) ease,
      transform var(--dur) var(--ease-spring);
  }

  .ss-theme-toggle:hover,
  .ss-menu-toggle:hover {
    color: var(--fg);
    border-color: var(--line-strong);
    transform: translateY(-1px);
  }

  .ss-theme-toggle svg {
    inline-size: 1.05rem;
    block-size: 1.05rem;
  }

  .ss-theme-toggle .ss-i-sun,
  [data-theme="light"] .ss-theme-toggle .ss-i-moon {
    display: none;
  }

  [data-theme="light"] .ss-theme-toggle .ss-i-sun {
    display: block;
  }

  .ss-menu-toggle {
    display: inline-grid;
  }

  @media (min-width: 60rem) {
    .ss-menu-toggle {
      display: none;
    }
  }

  /* Mobile drawer — a native <dialog>, so focus trapping, Esc-to-close and
     inert background come from the platform instead of 200 lines of JS. */
  .ss-drawer {
    inline-size: min(22rem, 88vw);
    max-block-size: 100svh;
    margin: 0 0 0 auto;
    padding: var(--space-m);
    border: 0;
    border-inline-start: 1px solid var(--line);
    background: var(--surface);
    color: var(--fg);
  }

  .ss-drawer::backdrop {
    background: rgb(4 4 10 / 62%);
    backdrop-filter: blur(6px);
  }

  .ss-drawer[open] {
    animation: ss-slide-in var(--dur) var(--ease-out);
  }

  @keyframes ss-slide-in {
    from {
      transform: translateX(100%);
    }
    to {
      transform: translateX(0);
    }
  }

  .ss-drawer__list {
    display: grid;
    gap: 0.15rem;
    margin-block: var(--space-m);
  }

  .ss-drawer__list a {
    display: block;
    padding: 0.8rem 0.9rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-display);
    font-size: var(--step-2);
    font-weight: 600;
    text-decoration: none;
    color: var(--fg);
    transition: background-color var(--dur) ease, padding-inline-start var(--dur) var(--ease-out);
  }

  .ss-drawer__list a:hover,
  .ss-drawer__list a[aria-current="page"] {
    background-color: var(--glass-hi);
    padding-inline-start: 1.3rem;
  }

  .ss-scroll-progress {
    position: fixed;
    inset-block-start: 0;
    inset-inline: 0;
    block-size: 2px;
    transform-origin: 0 50%;
    transform: scaleX(var(--progress, 0));
    background: linear-gradient(90deg, var(--brand-500), var(--accent), var(--warm));
    z-index: calc(var(--z-nav) + 1);
    pointer-events: none;
  }

  /* ---------------- 6.4 Cards & surfaces ---------------- */
  .ss-card {
    position: relative;
    padding: clamp(1.25rem, 2.6vw, 1.9rem);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-1);
    container-type: inline-size;
    transition: transform var(--dur) var(--ease-out),
      border-color var(--dur) ease, box-shadow var(--dur) ease;
  }

  .ss-card--hover:hover {
    transform: translateY(-4px);
    border-color: color-mix(in oklab, var(--brand-400) 42%, transparent);
    box-shadow: var(--shadow-2);
  }

  .ss-card--glass {
    background: var(--glass);
    backdrop-filter: blur(18px);
  }

  .ss-card--feature {
    display: flex;
    flex-direction: column;
    gap: var(--space-s);
  }

  /* Gradient hairline border, drawn with a masked pseudo-element so it
     survives any border-radius. */
  .ss-card--glow::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(
      145deg,
      color-mix(in oklab, var(--brand-400) 70%, transparent),
      transparent 42%,
      color-mix(in oklab, var(--accent) 55%, transparent)
    );
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
  }

  .ss-card__icon {
    display: grid;
    place-items: center;
    inline-size: 3rem;
    block-size: 3rem;
    flex: none;
    border-radius: var(--radius-md);
    background: color-mix(in oklab, var(--brand-500) 22%, transparent);
    border: 1px solid color-mix(in oklab, var(--brand-400) 30%, transparent);
    color: var(--brand-200);
  }

  [data-theme="light"] .ss-card__icon {
    color: var(--brand-700);
  }

  .ss-card__icon svg {
    inline-size: 1.5rem;
    block-size: 1.5rem;
  }

  .ss-card__num {
    font-family: var(--font-mono);
    font-size: var(--step--2);
    letter-spacing: 0.1em;
    color: var(--fg-faint);
  }

  .ss-card h3 + p,
  .ss-card h4 + p {
    margin-block-start: 0.55rem;
  }

  /* ---------------- 6.5 Eyebrow / pill / badge ---------------- */
  .ss-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: var(--step--2);
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--brand-300);
  }

  [data-theme="light"] .ss-eyebrow {
    color: var(--brand-600);
  }

  .ss-eyebrow::before {
    content: "";
    inline-size: 1.4rem;
    block-size: 1px;
    background: currentColor;
    opacity: 0.6;
  }

  .ss-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.32rem 0.72rem;
    border-radius: var(--radius-pill);
    border: 1px solid var(--line-strong);
    background: var(--glass-hi);
    font-size: var(--step--2);
    font-weight: 560;
    color: var(--fg-muted);
    text-decoration: none;
    white-space: nowrap;
  }

  a.ss-pill:hover {
    color: var(--fg);
    border-color: color-mix(in oklab, var(--brand-400) 50%, transparent);
  }

  .ss-pill--live {
    color: var(--accent);
    border-color: color-mix(in oklab, var(--accent) 38%, transparent);
  }

  .ss-pill--warn {
    color: var(--gold);
    border-color: color-mix(in oklab, var(--gold) 38%, transparent);
  }

  .ss-dot {
    inline-size: 0.45rem;
    block-size: 0.45rem;
    border-radius: 50%;
    background: currentColor;
    box-shadow: 0 0 0 0 currentColor;
    animation: ss-pulse 2.4s var(--ease-in-out) infinite;
  }

  @keyframes ss-pulse {
    0%,
    100% {
      box-shadow: 0 0 0 0 currentColor;
      opacity: 1;
    }
    55% {
      box-shadow: 0 0 0 5px transparent;
      opacity: 0.72;
    }
  }

  /* ---------------- 6.6 Data / stat blocks ---------------- */
  .ss-stat {
    display: grid;
    gap: 0.35rem;
    padding: clamp(1rem, 2vw, 1.5rem);
    border-inline-start: 2px solid color-mix(in oklab, var(--brand-400) 60%, transparent);
  }

  .ss-stat__value {
    font-family: var(--font-display);
    font-size: var(--step-3);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1;
    font-variant-numeric: tabular-nums lining-nums;
    color: var(--fg);
  }

  .ss-stat__label {
    font-size: var(--step--1);
    color: var(--fg-muted);
    max-inline-size: 30ch;
  }

  .ss-stat__source {
    font-family: var(--font-mono);
    font-size: var(--step--2);
    color: var(--fg-faint);
  }

  .ss-stat-group {
    display: grid;
    gap: var(--space-m);
    grid-template-columns: repeat(auto-fit, minmax(min(13rem, 100%), 1fr));
  }

  /* ---------------- 6.7 Tables ---------------- */
  .ss-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--surface);
    -webkit-overflow-scrolling: touch;
  }

  .ss-table {
    inline-size: 100%;
    border-collapse: collapse;
    font-size: var(--step--1);
  }

  .ss-table caption {
    caption-side: top;
    text-align: start;
    padding: 1rem 1.1rem;
    font-family: var(--font-display);
    font-size: var(--step-0);
    font-weight: 600;
    color: var(--fg);
    border-block-end: 1px solid var(--line);
  }

  .ss-table caption span {
    display: block;
    margin-block-start: 0.3rem;
    font-family: var(--font-sans);
    font-size: var(--step--2);
    font-weight: 400;
    color: var(--fg-faint);
  }

  .ss-table th,
  .ss-table td {
    padding: 0.85rem 1.1rem;
    text-align: start;
    border-block-end: 1px solid var(--line);
    vertical-align: top;
  }

  .ss-table thead th {
    font-family: var(--font-mono);
    font-size: var(--step--2);
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--fg-faint);
    background: var(--glass-hi);
    white-space: nowrap;
  }

  .ss-table tbody tr:last-child td,
  .ss-table tbody tr:last-child th {
    border-block-end: 0;
  }

  .ss-table tbody tr:hover {
    background: color-mix(in oklab, var(--brand-500) 8%, transparent);
  }

  .ss-table td strong {
    display: block;
  }

  .ss-table--compact th,
  .ss-table--compact td {
    padding: 0.6rem 0.85rem;
  }

  .ss-num {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
    text-align: end;
    white-space: nowrap;
  }

  /* ---------------- 6.8 Timeline ---------------- */
  .ss-timeline {
    display: grid;
    gap: 0;
    position: relative;
  }

  .ss-timeline__item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-s) var(--space-m);
    padding-block: var(--space-m);
    border-block-start: 1px solid var(--line);
  }

  .ss-timeline__when {
    font-family: var(--font-mono);
    font-size: var(--step--2);
    font-weight: 600;
    color: var(--brand-300);
    white-space: nowrap;
    padding-block-start: 0.25rem;
    min-inline-size: 8.5rem;
  }

  [data-theme="light"] .ss-timeline__when {
    color: var(--brand-600);
  }

  .ss-timeline__what h3 {
    font-size: var(--step-1);
  }

  .ss-timeline__what p {
    margin-block-start: 0.4rem;
    color: var(--fg-muted);
    max-inline-size: var(--measure);
  }

  .ss-timeline__item--past {
    opacity: 0.72;
  }

  /* ---------------- 6.9 FAQ (native <details>) ---------------- */
  .ss-faq {
    display: grid;
    gap: 0.6rem;
  }

  .ss-faq details {
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--surface);
    overflow: clip;
    transition: border-color var(--dur) ease;
  }

  .ss-faq details[open] {
    border-color: color-mix(in oklab, var(--brand-400) 45%, transparent);
    background: color-mix(in oklab, var(--brand-500) 7%, var(--surface));
  }

  .ss-faq summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-s);
    padding: 1.05rem 1.2rem;
    cursor: pointer;
    font-family: var(--font-display);
    font-size: var(--step-1);
    font-weight: 560;
    letter-spacing: -0.015em;
    list-style: none;
  }

  .ss-faq summary::-webkit-details-marker {
    display: none;
  }

  .ss-faq summary::after {
    content: "";
    inline-size: 0.7rem;
    block-size: 0.7rem;
    flex: none;
    border-inline-end: 2px solid var(--brand-400);
    border-block-end: 2px solid var(--brand-400);
    transform: rotate(45deg) translateY(-2px);
    transition: transform var(--dur) var(--ease-out);
  }

  .ss-faq details[open] summary::after {
    transform: rotate(225deg) translateY(-2px);
  }

  .ss-faq .ss-faq__body {
    padding: 0 1.2rem 1.3rem;
    color: var(--fg-muted);
    max-inline-size: var(--measure);
  }

  .ss-faq .ss-faq__body > * + * {
    margin-block-start: 0.7rem;
  }

  /* ---------------- 6.10 Code block ---------------- */
  .ss-code {
    position: relative;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--code-bg);
    overflow: clip;
  }

  .ss-code__bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 0.9rem;
    border-block-end: 1px solid var(--line);
    font-family: var(--font-mono);
    font-size: var(--step--2);
    color: var(--fg-faint);
    background: var(--glass-hi);
  }

  .ss-code__bar b {
    color: var(--fg-muted);
    font-weight: 500;
  }

  .ss-code pre {
    margin: 0;
    padding: 1.05rem 1.2rem;
    overflow-x: auto;
    font-size: var(--step--1);
    line-height: 1.65;
    color: var(--fg);
    tab-size: 2;
  }

  .ss-code .ss-c-com {
    color: var(--fg-faint);
  }

  .ss-code .ss-c-key {
    color: var(--brand-300);
  }

  .ss-code .ss-c-str {
    color: var(--accent);
  }

  .ss-code .ss-c-num {
    color: var(--gold);
  }

  [data-theme="light"] .ss-code .ss-c-key {
    color: var(--brand-600);
  }

  [data-theme="light"] .ss-code .ss-c-str {
    color: var(--accent-deep);
  }

  /* ---------------- 6.11 Marquee (logos / trust strip) ---------------- */
  .ss-marquee {
    overflow: clip;
    mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  }

  .ss-marquee__track {
    display: flex;
    gap: var(--space-xl);
    inline-size: max-content;
    animation: ss-marquee 42s linear infinite;
  }

  .ss-marquee:hover .ss-marquee__track {
    animation-play-state: paused;
  }

  @keyframes ss-marquee {
    to {
      transform: translateX(-50%);
    }
  }

  .ss-marquee__item {
    display: inline-flex;
    align-items: baseline;
    gap: 0.5rem;
    font-size: var(--step--1);
    color: var(--fg-faint);
    white-space: nowrap;
  }

  .ss-marquee__item b {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
    color: var(--fg-muted);
  }

  /* ---------------- 6.12 Citation / source list ---------------- */
  .ss-sources {
    display: grid;
    gap: 0.45rem;
    padding: 0;
    margin: 0;
    list-style: none;
    counter-reset: src;
    font-size: var(--step--2);
  }

  .ss-sources li {
    counter-increment: src;
    display: grid;
    grid-template-columns: 1.6rem 1fr;
    gap: 0.5rem;
    color: var(--fg-faint);
    line-height: 1.55;
  }

  .ss-sources li::before {
    content: "[" counter(src) "]";
    font-family: var(--font-mono);
    color: var(--brand-400);
  }

  .ss-sources a {
    color: var(--fg-muted);
    text-decoration-color: var(--line-strong);
    text-underline-offset: 2px;
  }

  .ss-sources a:hover {
    color: var(--fg);
  }

  .ss-cite {
    font-family: var(--font-mono);
    font-size: 0.75em;
    vertical-align: super;
    line-height: 0;
    color: var(--brand-400);
    text-decoration: none;
    padding-inline: 0.1em;
  }

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

  /* ---------------- 6.13 Spectrum / comparison bar ---------------- */
  .ss-bars {
    display: grid;
    gap: 1.05rem;
  }

  .ss-bar {
    display: grid;
    gap: 0.4rem;
  }

  .ss-bar__head {
    display: flex;
    justify-content: space-between;
    gap: var(--space-s);
    font-size: var(--step--1);
  }

  .ss-bar__head b {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
  }

  .ss-bar__track {
    block-size: 0.62rem;
    border-radius: var(--radius-pill);
    background: var(--glass-hi);
    border: 1px solid var(--line);
    overflow: clip;
  }

  .ss-bar__fill {
    block-size: 100%;
    inline-size: var(--w, 0%);
    border-radius: inherit;
    background: linear-gradient(90deg, var(--brand-500), var(--brand-400));
    transform-origin: 0 50%;
  }

  .ss-bar--accent .ss-bar__fill {
    background: linear-gradient(90deg, var(--accent-deep), var(--accent));
  }

  .ss-bar--muted .ss-bar__fill {
    background: linear-gradient(90deg, var(--fg-faint), var(--fg-muted));
  }

  .ss-bar__note {
    font-size: var(--step--2);
    color: var(--fg-faint);
  }

  /* ---------------- 6.14 Hero ---------------- */
  .ss-hero {
    position: relative;
    padding-block: clamp(3.5rem, 9vw, 7.5rem) clamp(3rem, 7vw, 6rem);
    overflow: clip;
  }

  .ss-hero__orb {
    position: absolute;
    z-index: 0;
    border-radius: 50%;
    filter: blur(90px);
    opacity: 0.5;
    pointer-events: none;
  }

  .ss-hero__orb--a {
    inline-size: 34rem;
    block-size: 34rem;
    inset-block-start: -12rem;
    inset-inline-start: -8rem;
    background: radial-gradient(circle, var(--brand-500), transparent 68%);
  }

  .ss-hero__orb--b {
    inline-size: 26rem;
    block-size: 26rem;
    inset-block-start: 4rem;
    inset-inline-end: -8rem;
    background: radial-gradient(circle, var(--accent-deep), transparent 68%);
    opacity: 0.38;
  }

  /* Raised above the decorative orbs. */
  .ss-hero__grid {
    position: relative;
    z-index: 1;
  }

  /* Used when the hero appears mid-page inside an already-padded section
     rather than as a standalone band: keeps the copy aligned with the
     heading above it instead of adding a second, narrower gutter. */
  .ss-hero--inline {
    padding-block: 0;
  }

  /* Two-column hero: copy on the left, a live product surface on the right.
     Collapses to a single column below 62rem. */
  .ss-hero__grid {
    display: grid;
    gap: clamp(2rem, 5vw, 4rem);
    align-items: center;
    grid-template-columns: 1fr;
  }

  @media (min-width: 62rem) {
    .ss-hero__grid {
      grid-template-columns: 1.05fr 0.95fr;
    }
  }

  .ss-hero__title {
    font-size: var(--step-6);
    letter-spacing: -0.042em;
    line-height: 1.02;
    max-inline-size: 22ch;
  }

  .ss-hero__title em {
    font-style: normal;
    background: linear-gradient(
      100deg,
      var(--brand-300) 0%,
      var(--accent) 52%,
      var(--brand-200) 100%
    );
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

  .ss-hero__lede {
    margin-block-start: var(--space-m);
    font-size: var(--step-1);
    line-height: var(--lead);
    color: var(--fg-muted);
    max-inline-size: 46ch;
  }

  .ss-hero__actions {
    margin-block-start: var(--space-l);
  }

  /* ---------------- 6.15 Bento grid ---------------- */
  .ss-bento {
    display: grid;
    gap: var(--space-m);
    grid-template-columns: 1fr;
  }

  @media (min-width: 52rem) {
    .ss-bento {
      grid-template-columns: repeat(6, 1fr);
    }

    .ss-bento > :nth-child(1) {
      grid-column: span 4;
    }

    .ss-bento > :nth-child(2) {
      grid-column: span 2;
    }

    .ss-bento > :nth-child(3) {
      grid-column: span 2;
    }

    .ss-bento > :nth-child(4) {
      grid-column: span 4;
    }

    .ss-bento > :nth-child(n + 5) {
      grid-column: span 3;
    }
  }

  /* ---------------- 6.16 Footer ---------------- */
  .ss-footer {
    border-block-start: 1px solid var(--line);
    padding-block: var(--space-2xl) var(--space-l);
    background: linear-gradient(180deg, transparent, color-mix(in oklab, var(--brand-900) 18%, transparent));
  }

  .ss-footer__grid {
    display: grid;
    gap: var(--space-xl);
    grid-template-columns: 1fr;
  }

  @media (min-width: 52rem) {
    .ss-footer__grid {
      grid-template-columns: 1.4fr repeat(3, 1fr);
    }
  }

  .ss-footer h3 {
    font-family: var(--font-mono);
    font-size: var(--step--2);
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--fg-faint);
    margin-block-end: var(--space-s);
  }

  .ss-footer ul {
    display: grid;
    gap: 0.55rem;
    list-style: none;
    padding: 0;
    margin: 0;
  }

  .ss-footer a {
    font-size: var(--step--1);
    color: var(--fg-muted);
    text-decoration: none;
    transition: color var(--dur) ease;
  }

  .ss-footer a:hover {
    color: var(--fg);
    text-decoration: underline;
    text-decoration-color: var(--brand-400);
    text-underline-offset: 3px;
  }

  .ss-footer__bottom {
    margin-block-start: var(--space-xl);
    padding-block-start: var(--space-m);
    border-block-start: 1px solid var(--line);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-s) var(--space-m);
    justify-content: space-between;
    align-items: center;
    font-size: var(--step--2);
    color: var(--fg-faint);
  }

  /* ---------------- 6.17 Contact / forms ---------------- */
  .ss-contact-list {
    display: grid;
    gap: 0;
  }

  .ss-contact-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-s);
    padding-block: var(--space-m);
    border-block-start: 1px solid var(--line);
  }

  .ss-contact-item:last-child {
    border-block-end: 1px solid var(--line);
  }

  .ss-contact-item__label {
    font-family: var(--font-mono);
    font-size: var(--step--2);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--fg-faint);
    grid-column: 2;
  }

  .ss-contact-item__value {
    grid-column: 2;
    font-size: var(--step-1);
    font-family: var(--font-display);
    font-weight: 560;
  }

  .ss-contact-item__value a {
    text-decoration: none;
    border-block-end: 2px solid color-mix(in oklab, var(--brand-400) 55%, transparent);
  }

  .ss-contact-item__value a:hover {
    border-block-end-color: var(--accent);
  }

  .ss-contact-item__note {
    grid-column: 2;
    font-size: var(--step--2);
    color: var(--fg-faint);
  }

  .ss-field {
    display: grid;
    gap: 0.4rem;
  }

  .ss-field label {
    font-size: var(--step--1);
    font-weight: 560;
  }

  .ss-field input,
  .ss-field textarea,
  .ss-field select {
    padding: 0.72rem 0.9rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--line-strong);
    background: var(--surface);
    color: var(--fg);
    transition: border-color var(--dur) ease, box-shadow var(--dur) ease;
  }

  .ss-field input:focus,
  .ss-field textarea:focus,
  .ss-field select:focus {
    outline: none;
    border-color: var(--brand-400);
    box-shadow: 0 0 0 3px color-mix(in oklab, var(--brand-500) 28%, transparent);
  }

  .ss-field__hint {
    font-size: var(--step--2);
    color: var(--fg-faint);
  }

  .ss-form-grid {
    display: grid;
    gap: var(--space-s);
  }

  @media (min-width: 40rem) {
    .ss-form-grid--2 {
      grid-template-columns: 1fr 1fr;
    }

    .ss-form-grid--2 .ss-field--wide {
      grid-column: 1 / -1;
    }
  }

  /* ---------------- 6.18 Notice / callout ---------------- */
  .ss-notice {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-s);
    padding: 1rem 1.15rem;
    border-radius: var(--radius-md);
    border: 1px solid color-mix(in oklab, var(--gold) 34%, transparent);
    background: color-mix(in oklab, var(--gold) 8%, transparent);
    font-size: var(--step--1);
    color: var(--fg-muted);
  }

  .ss-notice svg {
    inline-size: 1.25rem;
    block-size: 1.25rem;
    color: var(--gold);
    flex: none;
  }

  .ss-notice--info {
    border-color: color-mix(in oklab, var(--brand-400) 34%, transparent);
    background: color-mix(in oklab, var(--brand-500) 9%, transparent);
  }

  .ss-notice--info svg {
    color: var(--brand-300);
  }

  .ss-notice strong {
    color: var(--fg);
  }

  /* ---------------- 6.19 Breadcrumbs ---------------- */
  .ss-crumbs {
    font-size: var(--step--2);
    color: var(--fg-faint);
  }

  .ss-crumbs ol {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    list-style: none;
    padding: 0;
    margin: 0;
  }

  .ss-crumbs li + li::before {
    content: "/";
    margin-inline-end: 0.4rem;
    color: var(--line-strong);
  }

  .ss-crumbs a {
    text-decoration: none;
    color: var(--fg-faint);
  }

  .ss-crumbs a:hover {
    color: var(--fg);
  }

  .ss-crumbs [aria-current="page"] {
    color: var(--fg-muted);
  }

  /* ---------------- 6.20 Page header band ---------------- */
  .ss-band {
    position: relative;
    padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(2rem, 4vw, 3rem);
    border-block-end: 1px solid var(--line);
    overflow: clip;
  }

  .ss-band__inner {
    display: grid;
    gap: var(--space-m);
  }

  .ss-band h1 {
    font-size: var(--step-5);
    max-inline-size: 26ch;
  }

  .ss-band__lede {
    font-size: var(--step-1);
    line-height: var(--lead);
    color: var(--fg-muted);
    max-inline-size: 56ch;
  }

  .ss-band__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-s);
    font-size: var(--step--2);
    color: var(--fg-faint);
    font-family: var(--font-mono);
  }

  /* ---------------- 6.21 Tabs (progressive, anchor-based) --------------- */
  .ss-tabbar {
    display: flex;
    gap: 0.35rem;
    padding: 0.35rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-pill);
    background: var(--glass-hi);
    overflow-x: auto;
    scrollbar-width: none;
  }

  .ss-tabbar::-webkit-scrollbar {
    display: none;
  }

  .ss-tabbar a {
    padding: 0.5rem 0.95rem;
    border-radius: var(--radius-pill);
    font-size: var(--step--1);
    font-weight: 560;
    text-decoration: none;
    color: var(--fg-muted);
    white-space: nowrap;
  }

  .ss-tabbar a:hover {
    color: var(--fg);
    background: var(--glass-hi);
  }

  /* ---------------- 6.22 Step list ---------------- */
  .ss-steps {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: var(--space-l);
    counter-reset: step;
  }

  .ss-steps > li {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-m);
    counter-increment: step;
  }

  .ss-steps > li::before {
    content: counter(step, decimal-leading-zero);
    font-family: var(--font-mono);
    font-size: var(--step--1);
    font-weight: 600;
    color: var(--brand-300);
    padding-block-start: 0.35rem;
    border-block-start: 2px solid color-mix(in oklab, var(--brand-400) 55%, transparent);
    min-inline-size: 3.2rem;
  }

  [data-theme="light"] .ss-steps > li::before {
    color: var(--brand-600);
  }

  /* ---------------- 6.23 Accordion-free raw JSON viewer ---------------- */
  .ss-json {
    font-family: var(--font-mono);
    font-size: var(--step--2);
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-word;
    max-block-size: 22rem;
    overflow: auto;
    padding: 1rem 1.15rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--line);
    background: var(--code-bg);
    color: var(--fg-muted);
  }

  /* ---------------- 6.24 Reveal-on-scroll (JS-enhanced, safe without JS) - */
  [data-reveal] {
    opacity: 1;
  }

  .ss-js [data-reveal] {
    opacity: 0;
    transform: translateY(18px);
  }

  .ss-js [data-reveal].is-in {
    opacity: 1;
    transform: none;
    transition: opacity var(--dur-slow) var(--ease-out),
      transform var(--dur-slow) var(--ease-out);
    transition-delay: var(--reveal-delay, 0ms);
  }
}

/* ==========================================================================
   7. PAGE-SPECIFIC
   ========================================================================== */
@layer pages {
  /* Hero product mock */
  .ss-mock {
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--surface);
    box-shadow: var(--shadow-2);
    overflow: clip;
  }

  .ss-mock__chrome {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.7rem 0.95rem;
    border-block-end: 1px solid var(--line);
    background: var(--glass-hi);
    font-family: var(--font-mono);
    font-size: var(--step--2);
    color: var(--fg-faint);
  }

  .ss-mock__dots {
    display: flex;
    gap: 0.32rem;
  }

  .ss-mock__dots i {
    inline-size: 0.6rem;
    block-size: 0.6rem;
    border-radius: 50%;
    background: var(--line-strong);
  }

  .ss-mock__body {
    padding: 1.15rem;
    display: grid;
    gap: 0.9rem;
  }

  .ss-mock__row {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 0.85rem;
    align-items: center;
    padding: 0.7rem 0.8rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--glass-hi);
    font-size: var(--step--2);
  }

  .ss-mock__swatch {
    inline-size: 2.1rem;
    block-size: 2.1rem;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--brand-400), var(--accent-deep));
    flex: none;
  }

  .ss-mock__name {
    font-weight: 560;
    color: var(--fg);
  }

  .ss-mock__sub {
    color: var(--fg-faint);
  }

  .ss-mock__price {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
    color: var(--fg);
  }

  .ss-mock__bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-s);
    padding-block-start: 0.4rem;
    font-family: var(--font-mono);
    font-size: var(--step--2);
    color: var(--fg-faint);
  }

  /* Agent transcript */
  .ss-chat {
    display: grid;
    gap: 0.7rem;
    font-size: var(--step--1);
  }

  .ss-chat__msg {
    display: grid;
    gap: 0.3rem;
    padding: 0.8rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--line);
    background: var(--glass-hi);
    max-inline-size: 82%;
  }

  .ss-chat__msg--user {
    justify-self: end;
    border-color: color-mix(in oklab, var(--brand-400) 40%, transparent);
    background: color-mix(in oklab, var(--brand-500) 18%, transparent);
  }

  .ss-chat__who {
    font-family: var(--font-mono);
    font-size: var(--step--2);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--fg-faint);
  }

  .ss-chat__msg p {
    color: var(--fg);
    line-height: 1.55;
  }

  /* Metric chips row */
  .ss-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  /* Highlighted inline figure */
  .ss-fig {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums lining-nums;
    font-weight: 600;
    color: var(--fg);
    white-space: nowrap;
  }

  /* Pricing table emphasis */
  .ss-plan {
    display: grid;
    gap: var(--space-s);
    align-content: start;
  }

  .ss-plan__price {
    display: flex;
    align-items: baseline;
    gap: 0.4rem;
    font-family: var(--font-display);
  }

  .ss-plan__amount {
    font-size: var(--step-4);
    font-weight: 700;
    letter-spacing: -0.035em;
  }

  .ss-plan__unit {
    font-size: var(--step--1);
    color: var(--fg-muted);
  }

  .ss-plan__list {
    display: grid;
    gap: 0.5rem;
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: var(--step--1);
    color: var(--fg-muted);
  }

  .ss-plan__list li {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.55rem;
    align-items: start;
  }

  .ss-plan__list svg {
    inline-size: 1rem;
    block-size: 1rem;
    margin-block-start: 0.25rem;
    color: var(--accent);
    flex: none;
  }

  .ss-card--tier {
    border-color: color-mix(in oklab, var(--brand-400) 42%, transparent);
    box-shadow: var(--shadow-2);
  }
}

/* ==========================================================================
   8. UTILITIES
   ========================================================================== */
@layer utilities {
  .ss-visually-hidden {
    position: absolute !important;
    inline-size: 1px;
    block-size: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
  }

  .ss-text-muted {
    color: var(--fg-muted);
  }

  .ss-text-faint {
    color: var(--fg-faint);
  }

  .ss-text-accent {
    color: var(--accent);
  }

  .ss-mono {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
  }

  .ss-mt-s {
    margin-block-start: var(--space-s);
  }

  .ss-mt-m {
    margin-block-start: var(--space-m);
  }

  .ss-mt-l {
    margin-block-start: var(--space-l);
  }

  .ss-mt-xl {
    margin-block-start: var(--space-xl);
  }

  .ss-max-measure {
    max-inline-size: var(--measure);
  }

  .ss-no-js-hidden {
    display: none;
  }

  .ss-js .ss-no-js-hidden {
    display: revert;
  }

  .ss-js-hidden {
    display: revert;
  }

  .ss-js .ss-js-hidden {
    display: none;
  }

  /* Container query demo: the stat grid reflows by its own width, not the
     viewport's — so it behaves correctly inside narrow columns too. */
  @container (max-width: 22rem) {
    .ss-stat-group {
      grid-template-columns: 1fr;
    }
  }
}

/* ==========================================================================
   9. VIEW TRANSITIONS
   ========================================================================== */
@view-transition {
  navigation: auto;
}

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 220ms;
  animation-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   10. PRINT
   ========================================================================== */
@media print {
  :root {
    --bg: #fff;
    --fg: #000;
    --fg-muted: #333;
    --fg-faint: #555;
    --surface: #fff;
    --line: #ccc;
  }

  body::before,
  body::after,
  .ss-header,
  .ss-footer,
  .ss-scroll-progress,
  .ss-hero__orb {
    display: none !important;
  }

  .ss-card,
  .ss-table-wrap {
    box-shadow: none;
    break-inside: avoid;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #555;
  }
}