@layer syn.tokens, syn.base, syn.components, syn.semantic, syn.recipes, syn.geometry, syn.symbols, syn.effects, syn.utilities;

@layer syn.tokens {
  :where(.syn-root) {
    color-scheme: dark;
    --syn-font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --syn-mono: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
    --syn-font-ui: var(--syn-font);
    --syn-font-display: var(--syn-font);
    --syn-type-xs: .75rem;
    --syn-type-sm: .875rem;
    --syn-type-base: 1rem;
    /* Type roles are independent from theme palettes and optional font loading. */
    --syn-type-body: var(--syn-type-base);
    --syn-type-heading: clamp(1.15rem, 2.4vw, 1.55rem);
    --syn-type-display: clamp(2rem, 5.5vw, 4rem);
    --syn-leading-body: 1.55;
    --syn-tracking-display: -.045em;
    --syn-space-1: .375rem;
    --syn-space-2: .75rem;
    --syn-space-3: 1.125rem;
    --syn-space-4: 1.75rem;
    --syn-space-5: 2.5rem;
    --syn-cut: .9rem;
    --syn-radius: .25rem;
    --syn-line: 1.55;
    --syn-control-height: 2.75rem;
    --syn-control-padding-block: .7rem;
    --syn-row-padding-block: .7rem;
    --syn-card-padding: var(--syn-space-3);
    --syn-shadow-sm: 0 1px 3px rgb(0 0 0 / 8%);
    --syn-ease: cubic-bezier(.2, .8, .2, 1);
    --syn-duration-fast: 150ms;
  }
  /* Derived surfaces recompute inside nested themes, not just on the parent. */
  :where(.syn-root, .syn-root [data-syn-theme]) {
    --syn-surface-recessed: color-mix(in srgb, var(--syn-bg) 88%, var(--syn-surface));
    --syn-surface-raised: color-mix(in srgb, var(--syn-surface) 72%, var(--syn-surface-hi));
    --syn-border-subtle: color-mix(in srgb, var(--syn-frame) 60%, transparent);
    /* These aliases recompute in nested themed regions. */
    --syn-text-subtle: var(--syn-muted);
    --syn-border-default: var(--syn-frame);
    --syn-border-hover: var(--syn-frame-strong);
    --syn-border-focus: var(--syn-accent);
    --syn-focus-ring: var(--syn-accent);
    --syn-surface-interactive: var(--syn-surface-hi);
    --syn-surface-hover: color-mix(in srgb, var(--syn-surface-hi) 83%, var(--syn-accent));
    --syn-surface-pressed: var(--syn-accent-soft);
    --syn-font-ui: var(--syn-font);
    --syn-font-display: var(--syn-font);
  }
  /* Compact presentation is an opt-in layout control, never a font-size override. */
  :where(.syn-root[data-syn-density="compact"], .syn-root [data-syn-density="compact"]) {
    --syn-control-height: 2.25rem;
    --syn-control-padding-block: .3rem;
    --syn-row-padding-block: .4rem;
    --syn-card-padding: var(--syn-space-2);
  }
  :where(.syn-root), :where(.syn-root[data-syn-theme="grid"], .syn-root [data-syn-theme="grid"]) {
    color-scheme: dark;
    --syn-bg: #080f19;
    --syn-surface: #111f2c;
    --syn-surface-hi: #172a3b;
    --syn-text: #edf9ff;
    --syn-muted: #adbfca;
    --syn-accent: #76e7f7;
    --syn-accent-2: #f7b06c;
    --syn-on-accent: #07121a;
    --syn-frame: #345569;
    --syn-frame-strong: #5086a0;
    --syn-danger: #ffaaa4;
    --syn-success: #8ce6bb;
    --syn-warning: #ffd08b;
    --syn-accent-soft: color-mix(in srgb, var(--syn-accent) 11%, transparent);
    --syn-radius: .25rem;
    --syn-cut: .9rem;
  }
  :where(.syn-root[data-syn-theme="noir"], .syn-root [data-syn-theme="noir"]) {
    color-scheme: dark;
    --syn-bg: #0e0e12;
    --syn-surface: #1c1b20;
    --syn-surface-hi: #2a2628;
    --syn-text: #f8eee5;
    --syn-muted: #c3b5aa;
    --syn-accent: #f1b574;
    --syn-accent-2: #9acfd5;
    --syn-on-accent: #1c100b;
    --syn-frame: #625048;
    --syn-frame-strong: #9a7557;
    --syn-danger: #ffc1ac;
    --syn-success: #a5e4bc;
    --syn-warning: #fbd18c;
    --syn-accent-soft: color-mix(in srgb, var(--syn-accent) 10%, transparent);
    --syn-radius: .25rem;
    --syn-cut: .9rem;
  }
  :where(.syn-root[data-syn-theme="industrial"], .syn-root [data-syn-theme="industrial"]) {
    color-scheme: dark;
    --syn-bg: #121417;
    --syn-surface: #1c2023;
    --syn-surface-hi: #2a3033;
    --syn-text: #f3f2ee;
    --syn-muted: #c0c5c8;
    --syn-accent: #ffb36b;
    --syn-accent-2: #d6c9a9;
    --syn-on-accent: #241409;
    --syn-frame: #69747b;
    --syn-frame-strong: #a0b0b7;
    --syn-danger: #ffb2a7;
    --syn-success: #8dedb0;
    --syn-warning: #ffd08f;
    --syn-accent-soft: color-mix(in srgb, var(--syn-accent) 11%, transparent);
    --syn-radius: .15rem;
    --syn-cut: .45rem;
  }
  :where(.syn-root[data-syn-theme="terminal"], .syn-root [data-syn-theme="terminal"]) {
    color-scheme: dark;
    --syn-bg: #07130d;
    --syn-surface: #0d1f17;
    --syn-surface-hi: #153325;
    --syn-text: #d9fce7;
    --syn-muted: #a2d2b5;
    --syn-accent: #65e8a0;
    --syn-accent-2: #a6f0ce;
    --syn-on-accent: #062011;
    --syn-frame: #3e8761;
    --syn-frame-strong: #69bd8a;
    --syn-danger: #f6a8a8;
    --syn-success: #74e7a7;
    --syn-warning: #eccd86;
    --syn-accent-soft: color-mix(in srgb, var(--syn-accent) 11%, transparent);
    --syn-radius: 0;
    --syn-cut: 0;
  }
  :where(.syn-root[data-syn-theme="corporate"], .syn-root [data-syn-theme="corporate"]) {
    color-scheme: light;
    --syn-bg: #f5f8fc;
    --syn-surface: #ffffff;
    --syn-surface-hi: #e8eef6;
    --syn-text: #18273c;
    --syn-muted: #4b5d72;
    --syn-accent: #155ac8;
    --syn-accent-2: #087a8a;
    --syn-on-accent: #ffffff;
    --syn-frame: #73859b;
    --syn-frame-strong: #526c8c;
    --syn-danger: #b42331;
    --syn-success: #147446;
    --syn-warning: #9a5600;
    --syn-accent-soft: color-mix(in srgb, var(--syn-accent) 9%, transparent);
    --syn-radius: .5rem;
    --syn-cut: 0;
  }
  :where(.syn-root[data-syn-theme="minimal"], .syn-root [data-syn-theme="minimal"]) {
    color-scheme: light;
    --syn-bg: #f7f7f5;
    --syn-surface: #ffffff;
    --syn-surface-hi: #ebedee;
    --syn-text: #202328;
    --syn-muted: #5c6168;
    --syn-accent: #313a45;
    --syn-accent-2: #56606b;
    --syn-on-accent: #ffffff;
    --syn-frame: #7b8189;
    --syn-frame-strong: #555b62;
    --syn-danger: #aa2f3c;
    --syn-success: #1f6c45;
    --syn-warning: #8d5200;
    --syn-accent-soft: color-mix(in srgb, var(--syn-accent) 7%, transparent);
    --syn-radius: .375rem;
    --syn-cut: 0;
  }
    :where(.syn-root[data-syn-theme="studio"], .syn-root [data-syn-theme="studio"]) {
    color-scheme: light;
    --syn-bg: #f5f7fb;
    --syn-surface: #ffffff;
    --syn-surface-hi: #eaf0f8;
    --syn-text: #15233a;
    --syn-muted: #4b5d76;
    --syn-accent: #2458c6;
    --syn-accent-2: #176b80;
    --syn-on-accent: #ffffff;
    --syn-frame: #b8c6d8;
    --syn-frame-strong: #6685b2;
    --syn-danger: #ad2637;
    --syn-success: #17694b;
    --syn-warning: #92500a;
    --syn-accent-soft: color-mix(in srgb, var(--syn-accent) 9%, transparent);
    --syn-radius: .25rem;
    --syn-cut: .9rem;
  }

  /* Opt-in system palette: Studio in light mode, Grid in dark mode.
     The guard preserves the original dark defaults in older browsers. */
  @supports (color: light-dark(white, black)) {
    :where(.syn-root[data-syn-theme="auto"], .syn-root [data-syn-theme="auto"]) {
      color-scheme: light dark;
      --syn-bg: light-dark(#f5f7fb, #080f19);
      --syn-surface: light-dark(#ffffff, #111f2c);
      --syn-surface-hi: light-dark(#eaf0f8, #172a3b);
      --syn-text: light-dark(#15233a, #edf9ff);
      --syn-muted: light-dark(#4b5d76, #adbfca);
      --syn-accent: light-dark(#2458c6, #76e7f7);
      --syn-accent-2: light-dark(#176b80, #f7b06c);
      --syn-on-accent: light-dark(#ffffff, #07121a);
      --syn-frame: light-dark(#b8c6d8, #345569);
      --syn-frame-strong: light-dark(#6685b2, #5086a0);
      --syn-danger: light-dark(#ad2637, #ffaaa4);
      --syn-success: light-dark(#17694b, #8ce6bb);
      --syn-warning: light-dark(#92500a, #ffd08b);
      --syn-accent-soft: light-dark(color-mix(in srgb, var(--syn-accent) 9%, transparent), color-mix(in srgb, var(--syn-accent) 11%, transparent));
      --syn-radius: .25rem;
      --syn-cut: .9rem;
    }
  }
  /* Technical typography only for the fallback and explicit technical themes.
     Do not force monospace on Studio/Minimal/Corporate roots. */
  :where(.syn-root:not([data-syn-theme]), .syn-root[data-syn-theme="grid"],
         .syn-root [data-syn-theme="grid"], .syn-root[data-syn-theme="terminal"],
         .syn-root [data-syn-theme="terminal"]) {
    --syn-font-ui: var(--syn-mono);
    --syn-font-display: var(--syn-mono);
  }
}
@layer syn.base {
  :where(.syn-root), :where(.syn-root) *, :where(.syn-root) *::before, :where(.syn-root) *::after { box-sizing: border-box; }
  .syn-root {
    margin: 0;
    font: 400 var(--syn-type-body)/var(--syn-leading-body) var(--syn-font);
    color: var(--syn-text);
    background: var(--syn-bg);
    -webkit-font-smoothing: antialiased;
  }
  .syn-root :where([data-syn-theme]) { color: var(--syn-text); background-color: var(--syn-bg); }
  .syn-root.syn-page { min-height: 100svh; }
  .syn-root :where(h1,h2,h3,h4,p) { margin-block-start: 0; }
  .syn-root :where(h1,h2,h3,h4) { line-height: 1.12; letter-spacing: -.025em; overflow-wrap: anywhere; }
  .syn-root :where(button,input,select,textarea) { font: inherit; }
  .syn-root :where(a) { color: var(--syn-accent); text-underline-offset: .2em; }
  .syn-root :where(:focus-visible) { outline: 3px solid var(--syn-focus-ring); outline-offset: 3px; }
  .syn-root :where(:disabled, [aria-disabled="true"]) { cursor: not-allowed; opacity: .55; }
  .syn-root :where(::selection) { color: var(--syn-on-accent); background: var(--syn-accent); }
  @media (prefers-reduced-motion: reduce) {
    .syn-root *, .syn-root *::before, .syn-root *::after {
      scroll-behavior: auto !important;
      transition-duration: 0s !important;
      animation-duration: 0s !important;
    }
  }
  @media (forced-colors: active) {
    .syn-root :where(:focus-visible) { outline-color: Highlight; }
  }
}
@layer syn.components {
  .syn-shell { width: min(100% - 2rem, 72rem); margin-inline: auto; }
  .syn-header { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; padding-block: 2rem; }
  .syn-nav { display: flex; align-items: center; flex-wrap: wrap; gap: 1rem; }
  .syn-nav a { color: var(--syn-muted); text-decoration: none; font: 600 var(--syn-type-sm) var(--syn-font-ui); }
  .syn-nav a:hover, .syn-nav a[aria-current] { color: var(--syn-accent); }
  .syn-stage {
    --syn-stage-pad: clamp(1.25rem, 4vw, 3rem);
    background: radial-gradient(ellipse at 85% 5%, var(--syn-accent-soft), transparent 50%), var(--syn-bg);
    color: var(--syn-text);
    border: 1px solid var(--syn-frame);
    padding: var(--syn-stage-pad);
    margin-block: 1.5rem;
    position: relative;
    isolation: isolate;
  }
  .syn-stage::before { content: ""; position: absolute; top: 0; left: 0; width: 4rem; height: 2px; background: var(--syn-accent); }
  .syn-stage-header { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 1rem; margin-block-end: 1.75rem; }
  .syn-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); }
  .syn-layout { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 21rem), 1fr)); align-items: start; }
  .syn-stack { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--syn-space-3); }
  .syn-inline { display: flex; align-items: center; flex-wrap: wrap; gap: var(--syn-space-2); }
  .syn-panel {
    position: relative; padding: clamp(1rem, 2.8vw, 1.75rem); overflow-wrap: anywhere;
    color: var(--syn-text); border: 1px solid var(--syn-border-subtle);
    background: linear-gradient(160deg, var(--syn-accent-soft), transparent 40%), var(--syn-surface);
    min-width: 0;
  }
  .syn-panel--cut::after {
    content: ""; pointer-events: none; position: absolute; right: -1px; bottom: -1px;
    width: var(--syn-cut); height: var(--syn-cut); background: var(--syn-bg);
    clip-path: polygon(100% 0, 0 100%, 100% 100%);
  }
  @media (forced-colors: active) { .syn-stage, .syn-panel { border-color: CanvasText; } }
}
@layer syn.components {
  .syn-logo { font: 700 .95rem/1 var(--syn-mono); letter-spacing: .22em; text-decoration: none; color: var(--syn-text); }
  .syn-eyebrow { font: 700 var(--syn-type-xs)/1.4 var(--syn-font-ui); letter-spacing: .15em; text-transform: uppercase; color: var(--syn-accent); }
  .syn-title, .syn-display { font-family: var(--syn-font-display); font-size: var(--syn-type-display); line-height: 1.08; letter-spacing: var(--syn-tracking-display); margin-block: 1rem; max-width: 14ch; }
  .syn-heading { font-family: var(--syn-font-display); font-size: var(--syn-type-heading); line-height: 1.2; margin-block: .5rem 1rem; }
  .syn-body { font: 400 var(--syn-type-body)/var(--syn-leading-body) var(--syn-font-ui); }
  .syn-text-support { font: 400 var(--syn-type-sm)/1.5 var(--syn-font-ui); color: var(--syn-text-subtle); }
  /* Opt-in vertical rhythm; does not alter unwrapped host document styles. */
  .syn-prose { max-width: 65ch; font: 400 var(--syn-type-body)/var(--syn-leading-body) var(--syn-font-ui); }
  .syn-prose > :where(* + *) { margin-block-start: var(--syn-space-2); }
  .syn-prose > :where(h2, h3, h4) { margin-block-start: var(--syn-space-4); }
  .syn-lede { max-width: 56ch; color: var(--syn-muted); }
  .syn-muted { color: var(--syn-text-subtle); }
  .syn-mono { font-family: var(--syn-mono); font-variant-numeric: tabular-nums; }
  .syn-caption { overflow-wrap: anywhere; color: var(--syn-text-subtle); font: 500 var(--syn-type-xs)/1.5 var(--syn-font-ui); letter-spacing: .04em; }
  .syn-metric { margin: .5rem 0 0; font: 650 clamp(2.2rem, 5vw, 3.3rem)/1.1 var(--syn-font-display); font-variant-numeric: tabular-nums; letter-spacing: -.06em; }
  .syn-rule { border: 0; border-top: 1px solid var(--syn-frame); margin-block: 1.25rem; }
  .syn-badge { display: inline-flex; width: fit-content; max-width: 100%; overflow-wrap: anywhere; align-items: center; gap: .45rem; padding: .34rem .6rem; border: 1px solid var(--syn-frame); background: var(--syn-accent-soft); color: var(--syn-accent); font: 650 var(--syn-type-xs)/1.25 var(--syn-font-ui); letter-spacing: .04em; }
  .syn-badge::before { content: ""; width: .35rem; height: .35rem; border-radius: 50%; background: currentColor; }
  .syn-alert { padding: .8rem 1rem; border-inline-start: 3px solid var(--syn-accent); background: var(--syn-surface); color: var(--syn-text); }
  .syn-alert--danger { border-inline-start-color: var(--syn-danger); }
  .syn-code { font: .85em/1.5 var(--syn-mono); overflow-wrap: anywhere; background: var(--syn-surface-hi); padding: .12em .35em; }
  @media (forced-colors: active) { .syn-badge, .syn-alert { border-color: CanvasText; } }
}
@layer syn.components {
  .syn-actions { display: flex; flex-wrap: wrap; gap: .65rem; margin-block-start: 1.5rem; }
  .syn-button {
    display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
    min-height: var(--syn-control-height); padding: var(--syn-control-padding-block) 1rem;
    min-width: 0; max-width: 100%; text-align: center; overflow-wrap: anywhere;
    border: 1px solid var(--syn-border-default); border-radius: var(--syn-radius);
    background: var(--syn-surface-interactive); color: var(--syn-text);
    text-decoration: none; font: 600 var(--syn-type-sm)/1.2 var(--syn-font-ui); letter-spacing: -.005em;
    cursor: pointer; transition: background-color var(--syn-duration-fast) var(--syn-ease), border-color var(--syn-duration-fast) var(--syn-ease), color var(--syn-duration-fast) var(--syn-ease);
  }
  .syn-button:where(:not(:disabled):not([aria-disabled="true"]):hover) { border-color: var(--syn-border-hover); background: var(--syn-surface-hover); }
  .syn-button:where(:not(:disabled):not([aria-disabled="true"]):active) { box-shadow: inset 0 2px 3px rgb(0 0 0 / 14%); }
  .syn-button--primary { background: var(--syn-accent); border-color: var(--syn-accent); color: var(--syn-on-accent); }
  .syn-button--primary:where(:not(:disabled):not([aria-disabled="true"]):hover) { background: color-mix(in srgb, var(--syn-accent), white 10%); color: var(--syn-on-accent); }
  .syn-button--outline { background: transparent; border-color: var(--syn-accent); color: var(--syn-accent); }
  .syn-button--outline:where(:not(:disabled):not([aria-disabled="true"]):hover) { background: var(--syn-accent-soft); }
  .syn-button--danger { color: var(--syn-danger); border-color: var(--syn-danger); background: transparent; }
  .syn-button--danger:where(:not(:disabled):not([aria-disabled="true"]):hover) { background: color-mix(in srgb, var(--syn-danger), transparent 88%); }
  .syn-button--small { min-height: 2.25rem; padding: .4rem .65rem; font-size: var(--syn-type-xs); }
  .syn-button--ghost { background: transparent; border-color: transparent; }
  .syn-button--ghost:where(:not(:disabled):not([aria-disabled="true"]):hover) { background: var(--syn-accent-soft); border-color: var(--syn-frame); }
    .syn-button:where([aria-pressed="true"], [data-syn-state="active"]) {
    border-color: var(--syn-accent);
    background: var(--syn-surface-pressed);
    color: var(--syn-accent);
  }
  .syn-button[aria-busy="true"] { cursor: progress; }
    .syn-button:is(:disabled, [aria-disabled="true"]) { cursor: not-allowed; }
  @media (forced-colors: active) {
    .syn-button { border-color: ButtonText; }
    .syn-button--primary { background: ButtonFace; color: ButtonText; border-color: ButtonText; }
    .syn-button--danger, .syn-button--outline { border-color: ButtonText; color: ButtonText; }
  }
}
@layer syn.components {
  .syn-form { display: grid; gap: 1rem; }
  .syn-label { display: grid; gap: .35rem; font: 600 var(--syn-type-sm)/1.35 var(--syn-font-ui); }
  .syn-input, .syn-select, .syn-textarea {
    width: 100%; min-height: var(--syn-control-height); padding: var(--syn-control-padding-block) .8rem;
    border: 1px solid var(--syn-border-default); background: var(--syn-bg);
    border-radius: var(--syn-radius); color: var(--syn-text);
  }
  .syn-input::placeholder, .syn-textarea::placeholder { color: var(--syn-muted); opacity: 1; }
  .syn-input:where(:not(:disabled):hover), .syn-select:where(:not(:disabled):hover),
  .syn-textarea:where(:not(:disabled):hover) { border-color: var(--syn-border-hover); }
  .syn-input:where(:focus), .syn-select:where(:focus), .syn-textarea:where(:focus) { border-color: var(--syn-border-focus); }
  .syn-input:disabled, .syn-select:disabled, .syn-textarea:disabled { background: var(--syn-surface-recessed); }
  .syn-input:where(:user-invalid, [aria-invalid="true"]),
  .syn-select:where(:user-invalid, [aria-invalid="true"]),
  .syn-textarea:where(:user-invalid, [aria-invalid="true"]) { border-color: var(--syn-danger); }
  .syn-help { color: var(--syn-muted); font-size: .8rem; }
  .syn-error { color: var(--syn-danger); font-size: .8rem; }
  .syn-textarea { min-height: 6rem; resize: vertical; }
  .syn-input[type="checkbox"], .syn-input[type="radio"] { width: 1.1rem; min-height: auto; height: 1.1rem; padding: 0; accent-color: var(--syn-accent); vertical-align: middle; }
  .syn-check { display: inline-flex; align-items: center; gap: .55rem; color: var(--syn-text); cursor: pointer; }
  .syn-fieldset { border: 1px solid var(--syn-frame); padding: 1rem; min-width: 0; }
  .syn-fieldset legend { padding-inline: .45rem; font: 600 .78rem var(--syn-mono); }
  @media (forced-colors: active) {
    .syn-input, .syn-select, .syn-textarea, .syn-fieldset { border-color: CanvasText; }
  }
}
@layer syn.components {
  .syn-popover, .syn-dialog {
    width: min(calc(100vw - 2rem), 26rem); padding: 1.5rem;
    border: 1px solid var(--syn-accent); border-radius: var(--syn-radius);
    background: var(--syn-surface); color: var(--syn-text);
    box-shadow: 0 20px 70px rgb(0 0 0 / 45%);
  }
  .syn-popover { margin: .75rem; inset: auto 1rem 1rem auto; }
  .syn-dialog { margin: auto; }
  .syn-dialog::backdrop { background: rgb(0 0 0 / 70%); }
  .syn-details { padding: 1rem 0; border-block-start: 1px solid var(--syn-frame); }
  .syn-details summary { cursor: pointer; color: var(--syn-text); font-weight: 650; }
  .syn-details[open] summary { color: var(--syn-accent); }
  .syn-details p { color: var(--syn-muted); margin: .6rem 0 0; }
  @media (forced-colors: active) { .syn-popover, .syn-dialog, .syn-details { border-color: CanvasText; } }
}
@layer syn.components {
  .syn-meter { width: 100%; height: .45rem; overflow: hidden; border: none; border-radius: 0; accent-color: var(--syn-accent); }
  .syn-meter::-webkit-progress-bar { background: var(--syn-bg); }
  .syn-meter::-webkit-progress-value { background: var(--syn-accent); }
  .syn-meter::-moz-progress-bar { background: var(--syn-accent); }
  .syn-table-wrap { overflow-x: auto; }
  .syn-table { width: 100%; border-collapse: collapse; text-align: left; font: var(--syn-type-sm)/1.55 var(--syn-font-ui); }
  .syn-table th, .syn-table td { padding: var(--syn-row-padding-block) .65rem; border-block-end: 1px solid var(--syn-border-subtle); white-space: nowrap; }
  .syn-table tbody tr:not([aria-selected="true"]):not([data-syn-state="selected"]):hover { background: var(--syn-surface-raised); }
  .syn-table tr[aria-selected="true"], .syn-table tr[data-syn-state="selected"] { background: var(--syn-surface-pressed); }
  .syn-table tr:focus-within { outline: 2px solid var(--syn-focus-ring); outline-offset: -2px; }
  .syn-table th { color: var(--syn-text-subtle); font-weight: 550; }
  /* No implicit last-column accent: table columns may contain any kind of data. */
  .syn-table .syn-table-emphasis { color: var(--syn-accent); font-weight: 650; }
  .syn-table .syn-cell--numeric { text-align: right; font-variant-numeric: tabular-nums; }
  .syn-status { display: inline-flex; gap: .4em; align-items: center; color: var(--syn-text); font: 650 var(--syn-type-xs)/1.5 var(--syn-font-ui); }
  .syn-status::before { content: ""; flex: none; width: .45em; height: .45em; border-radius: 50%; background: currentColor; }
  .syn-status--success { color: var(--syn-success); }
  .syn-status--warning { color: var(--syn-warning); }
  .syn-status--danger { color: var(--syn-danger); }
  @media (forced-colors: active) {
    .syn-status::before { border: 1px solid currentColor; }
  }
}
@layer syn.components {
  .syn-region { container-name: syn-region; container-type: inline-size; min-width: 0; }
  .syn-split { display: grid; gap: var(--syn-space-3); min-width: 0; }
  .syn-stats { display: grid; gap: var(--syn-space-2); grid-template-columns: minmax(0, 1fr); }
  .syn-stat { padding: var(--syn-space-3); border: 1px solid var(--syn-frame); background: var(--syn-surface); min-width: 0; }
  .syn-stat-label { color: var(--syn-muted); font: 650 .8125rem/1.4 var(--syn-mono); letter-spacing: .05em; }
  .syn-stat-value { margin: .5rem 0 0; color: var(--syn-text); font: 650 clamp(1.7rem, 4vw, 2.4rem)/1.1 var(--syn-mono); font-variant-numeric: tabular-nums; }
  .syn-toolbar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--syn-space-2); }
  .syn-empty { display: grid; justify-items: center; align-content: center; text-align: center; gap: var(--syn-space-2); min-height: 12rem; padding: var(--syn-space-4); border: 1px dashed var(--syn-frame); background: var(--syn-surface); }
  .syn-empty > :where(h2, h3, p) { margin-block: 0; }
  .syn-pricing { display: grid; gap: var(--syn-space-2); grid-template-columns: minmax(0, 1fr); }
  .syn-price-card { display: flex; flex-direction: column; gap: var(--syn-space-3); min-width: 0; border: 1px solid var(--syn-frame); padding: var(--syn-space-4); background: var(--syn-surface); }
  .syn-price-card[data-syn-featured] { border-color: var(--syn-accent); background: linear-gradient(155deg, var(--syn-accent-soft), transparent 55%), var(--syn-surface); }
  .syn-price-card > .syn-button { margin-block-start: auto; }
  .syn-price-value { margin: 0; color: var(--syn-text); font: 650 clamp(2rem, 5vw, 3rem)/1.1 var(--syn-mono); font-variant-numeric: tabular-nums; }
  .syn-price-value small { color: var(--syn-muted); font: 400 .9rem var(--syn-font); }
  .syn-feature-list { display: grid; gap: .6rem; padding-inline-start: 1.2rem; margin: 0 0 var(--syn-space-3); color: var(--syn-muted); }
  .syn-feature-list li::marker { color: var(--syn-accent); }
    .syn-breadcrumbs ol { display: flex; align-items: center; flex-wrap: wrap; gap: .5rem; list-style: none; padding: 0; margin: 0; }
  .syn-breadcrumbs li { display: inline-flex; align-items: center; gap: .5rem; min-width: 0; }
  .syn-breadcrumbs li + li::before { content: ""; height: .85em; border-inline-start: 1px solid var(--syn-frame-strong); transform: skew(-22deg); }
  .syn-breadcrumbs a { color: var(--syn-muted); }
  .syn-breadcrumbs [aria-current="page"] { color: var(--syn-text); font-weight: 650; }
  .syn-pagination { display: flex; flex-wrap: wrap; align-items: center; gap: .375rem; }
  .syn-page-link { display: inline-grid; place-items: center; min-width: 2.75rem; min-height: 2.75rem; padding: .4rem; border: 1px solid var(--syn-frame); color: var(--syn-text); text-decoration: none; border-radius: var(--syn-radius); }
  .syn-page-link:hover, .syn-page-link[aria-current="page"] { border-color: var(--syn-accent); background: var(--syn-accent-soft); }
  .syn-page-link[aria-current="page"] { font-weight: 700; }
    .syn-skeleton { display: block; width: 100%; min-height: 1em; background: var(--syn-surface-hi); border: 1px solid var(--syn-frame); border-radius: var(--syn-radius); }
  .syn-skeleton--short { max-width: 55%; }
  @container syn-region (min-width: 31rem) {
    .syn-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  }
  @container syn-region (min-width: 43rem) {
    .syn-split { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); }
    .syn-pricing { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  }
  @container syn-region (min-width: 55rem) {
    .syn-stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  }
  @media (forced-colors: active) {
    .syn-stat, .syn-empty, .syn-price-card, .syn-price-card[data-syn-featured] { border-color: CanvasText; }
  }
}
/* Optional semantic mode. Class-free elements auto-style; data-syn-semantic opts in
   controls whose host framework adds ephemeral classes (HTMX, Alpine, etc.).
   Requires core.css and a scoped .syn-semantic ancestor. */
@layer syn.semantic {
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(button:not([class]), button[data-syn-semantic]), :is(input[type="submit"]:not([class]), input[type="submit"][data-syn-semantic]), :is(input[type="button"]:not([class]), input[type="button"][data-syn-semantic]), :is(input[type="reset"]:not([class]), input[type="reset"][data-syn-semantic])) {
    display: inline-flex; justify-content: center; align-items: center; gap: .5rem;
    min-height: var(--syn-control-height); padding: var(--syn-control-padding-block) 1rem;
    border: 1px solid var(--syn-border-default); border-radius: var(--syn-radius);
    background: var(--syn-surface-interactive); color: var(--syn-text);
    cursor: pointer; font: 600 var(--syn-type-sm)/1.2 var(--syn-font-ui);
  }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(button:not([class]), button[data-syn-semantic]), :is(input[type="submit"]:not([class]), input[type="submit"][data-syn-semantic]), :is(input[type="button"]:not([class]), input[type="button"][data-syn-semantic]), :is(input[type="reset"]:not([class]), input[type="reset"][data-syn-semantic])):where(:not(:disabled):not([aria-disabled="true"]):hover) { border-color: var(--syn-border-hover); background: var(--syn-surface-hover); }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(button:not([class]), button[data-syn-semantic]), :is(input[type="submit"]:not([class]), input[type="submit"][data-syn-semantic]), :is(input[type="button"]:not([class]), input[type="button"][data-syn-semantic]), :is(input[type="reset"]:not([class]), input[type="reset"][data-syn-semantic])):where(:not(:disabled):not([aria-disabled="true"]):active) { box-shadow: inset 0 2px 3px rgb(0 0 0 / 14%); }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(button:not([class]), button[data-syn-semantic]), :is(input[type="submit"]:not([class]), input[type="submit"][data-syn-semantic]), :is(input[type="button"]:not([class]), input[type="button"][data-syn-semantic]), :is(input[type="reset"]:not([class]), input[type="reset"][data-syn-semantic]))[aria-busy="true"] { cursor: progress; }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(input:not([class]), input[data-syn-semantic]):is(:not([type]), [type="text"], [type="email"], [type="search"], [type="password"], [type="url"], [type="tel"], [type="number"], [type="date"], [type="time"], [type="datetime-local"], [type="month"], [type="week"]), :is(select:not([class]), select[data-syn-semantic]), :is(textarea:not([class]), textarea[data-syn-semantic])) {
    width: 100%; min-height: var(--syn-control-height); padding: var(--syn-control-padding-block) .8rem;
    border: 1px solid var(--syn-border-default); background: var(--syn-bg); border-radius: var(--syn-radius); color: var(--syn-text);
  }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(input:not([class]), input[data-syn-semantic]):is(:not([type]), [type="text"], [type="email"], [type="search"], [type="password"], [type="url"], [type="tel"], [type="number"], [type="date"], [type="time"], [type="datetime-local"], [type="month"], [type="week"]), :is(select:not([class]), select[data-syn-semantic]), :is(textarea:not([class]), textarea[data-syn-semantic])):where(:not(:disabled):hover) { border-color: var(--syn-border-hover); }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(input:not([class]), input[data-syn-semantic]):is(:not([type]), [type="text"], [type="email"], [type="search"], [type="password"], [type="url"], [type="tel"], [type="number"], [type="date"], [type="time"], [type="datetime-local"], [type="month"], [type="week"]), :is(select:not([class]), select[data-syn-semantic]), :is(textarea:not([class]), textarea[data-syn-semantic])):where(:focus) { border-color: var(--syn-border-focus); }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(input:not([class]), input[data-syn-semantic]):is(:not([type]), [type="text"], [type="email"], [type="search"], [type="password"], [type="url"], [type="tel"], [type="number"], [type="date"], [type="time"], [type="datetime-local"], [type="month"], [type="week"]), :is(select:not([class]), select[data-syn-semantic]), :is(textarea:not([class]), textarea[data-syn-semantic])):disabled { background: var(--syn-surface-recessed); }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(input:not([class]), input[data-syn-semantic]), :is(select:not([class]), select[data-syn-semantic]), :is(textarea:not([class]), textarea[data-syn-semantic])):where(:user-invalid, [aria-invalid="true"]) { border-color: var(--syn-danger); }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(input[type="range"]:not([class]), input[type="range"][data-syn-semantic])) { width: 100%; }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(input:not([class]), input[data-syn-semantic]), :is(textarea:not([class]), textarea[data-syn-semantic]))::placeholder { color: var(--syn-text-subtle); opacity: 1; }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(input[type="checkbox"]:not([class]), input[type="checkbox"][data-syn-semantic]), :is(input[type="radio"]:not([class]), input[type="radio"][data-syn-semantic]), :is(input[type="range"]:not([class]), input[type="range"][data-syn-semantic])) { accent-color: var(--syn-accent); }
  /* WCAG 2.2 AA target-size minimum; native controls remain keyboard-operable. */
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(input[type="checkbox"]:not([class]), input[type="checkbox"][data-syn-semantic]), :is(input[type="radio"]:not([class]), input[type="radio"][data-syn-semantic])) {
    min-inline-size: max(1.5rem, 24px); min-block-size: max(1.5rem, 24px);
    vertical-align: middle; margin: 0; margin-inline-end: .65rem;
  }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(label:not([class]), label[data-syn-semantic])) { display: grid; gap: .35rem; font-weight: 600; font-size: .9rem; }
  /* Native checkbox/radio labels stay inline, even when HTMX adds classes. */
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(label:not([class]):has(> input[type="checkbox"], > input[type="radio"]), label[data-syn-semantic]:has(> input[type="checkbox"], > input[type="radio"])) { display: block; cursor: pointer; }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(fieldset:not([class]), fieldset[data-syn-semantic])) { border: 1px solid var(--syn-frame); min-width: 0; padding: 1rem; }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(legend:not([class]), legend[data-syn-semantic])) { padding-inline: .4rem; }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(article:not([class]), article[data-syn-semantic])) { padding: clamp(1rem, 3vw, 1.75rem); border: 1px solid var(--syn-frame); background: var(--syn-surface); min-width: 0; }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(table:not([class]), table[data-syn-semantic])) { width: 100%; border-collapse: collapse; text-align: left; }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(th:not([class]), th[data-syn-semantic]), :is(td:not([class]), td[data-syn-semantic])) { padding: .65rem; border-bottom: 1px solid var(--syn-frame); }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(th:not([class]), th[data-syn-semantic])) { color: var(--syn-text-subtle); }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(details:not([class]), details[data-syn-semantic])) { padding-block: .75rem; border-block-start: 1px solid var(--syn-frame); }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(summary:not([class]), summary[data-syn-semantic])) { cursor: pointer; font-weight: 600; }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(blockquote:not([class]), blockquote[data-syn-semantic])) { margin-inline: 0; padding: .5rem 1rem; border-inline-start: 2px solid var(--syn-accent); color: var(--syn-muted); }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(hr:not([class]), hr[data-syn-semantic])) { border: 0; border-top: 1px solid var(--syn-frame); }
  :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(code:not([class]), code[data-syn-semantic])) { font-family: var(--syn-mono); color: var(--syn-accent); }
  @media (forced-colors: active) {
    :is(.syn-root.syn-semantic, .syn-root .syn-semantic) :where(:is(button:not([class]), button[data-syn-semantic]), :is(input:not([class]), input[data-syn-semantic]), :is(select:not([class]), select[data-syn-semantic]), :is(textarea:not([class]), textarea[data-syn-semantic]), :is(article:not([class]), article[data-syn-semantic]), :is(fieldset:not([class]), fieldset[data-syn-semantic])) { border-color: CanvasText; }
  }
}
/* Optional page-level compositions. Semantic HTML, no runtime JavaScript.
   These classes are separate from the small, stable core API. */
@layer syn.recipes {
  /* Small fluid type scale and intrinsic layouts (all opt-in). */
  .syn-root {
    --syn-fluid-display-size: clamp(2rem, 1.3rem + 2.8vw, 4.25rem);
    --syn-type-lede: clamp(1.0625rem, 1rem + .4vw, 1.375rem);
    --syn-reading-width: 65ch;
  }
  .syn-root .syn-fluid-display { font-size: var(--syn-fluid-display-size); line-height: 1.08; letter-spacing: -.035em; overflow-wrap: anywhere; }
  .syn-root .syn-fluid-lede { font-size: var(--syn-type-lede); }
  .syn-root .syn-reading { max-inline-size: var(--syn-reading-width); }
  /* First child is sidebar; second child is the flexible content region. */
  .syn-root .syn-sidebar { display: flex; flex-wrap: wrap; align-items: start; gap: var(--syn-space-3); min-width: 0; }
  .syn-root .syn-sidebar > :first-child { flex: 1 1 var(--syn-sidebar-width, 16rem); min-width: min(100%, var(--syn-sidebar-width, 16rem)); }
  .syn-root .syn-sidebar > :last-child { flex: 999 1 0; min-width: min(100%, var(--syn-sidebar-content-min, 28rem)); }
  /* All children switch together from stacked to inline as space permits. */
  .syn-root .syn-switcher { display: flex; flex-wrap: wrap; gap: var(--syn-space-3); min-width: 0; }
  .syn-root .syn-switcher > * { flex-grow: 1; flex-basis: max(0px, calc((var(--syn-switcher-threshold, 40rem) - 100%) * 999)); min-width: 0; }

  /* Application shell: usable with server rendering, HTMX, React or plain HTML. */
  .syn-app-shell {
    display: grid; grid-template-columns: minmax(0, 1fr);
    min-height: 100svh; min-width: 0;
  }
  .syn-app-rail {
    display: flex; flex-direction: column; gap: var(--syn-space-2);
    padding: var(--syn-space-3); border-block-end: 1px solid var(--syn-frame);
    background: var(--syn-surface-recessed); color: var(--syn-text);
  }
  .syn-app-nav { display: flex; gap: .35rem; flex-wrap: wrap; }
  .syn-app-nav a {
    display: block; padding: .55rem .75rem; border-radius: var(--syn-radius);
    color: var(--syn-muted); text-decoration: none; font-size: .875rem; font-weight: 600;
  }
  .syn-app-nav a:where(:hover, [aria-current="page"]) {
    color: var(--syn-accent); background: var(--syn-accent-soft);
  }
  .syn-app-nav a[aria-current="page"] { box-shadow: inset 3px 0 var(--syn-accent); }
  .syn-workspace { width: 100%; min-width: 0; padding: clamp(1rem, 3vw, 2.5rem); }
  .syn-app-topbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; margin-block-end: 1.5rem; }
  .syn-kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr)); gap: var(--syn-space-2); }
  .syn-app-card {
    min-width: 0; padding: var(--syn-card-padding);
    border: 1px solid var(--syn-border-subtle); border-radius: var(--syn-radius);
    background: var(--syn-surface); color: var(--syn-text);
    box-shadow: var(--syn-shadow-sm);
  }
  .syn-app-card > :first-child { margin-block-start: 0; }
  .syn-app-card > :last-child { margin-block-end: 0; }
  .syn-app-card-header { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: .6rem; margin-block-end: 1rem; }
  .syn-app-card-header > :first-child { margin: 0; }
  .syn-activity-list { list-style: none; margin: 0; padding: 0; }
  .syn-activity-list li { display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem 1rem; padding: .75rem 0; border-block-end: 1px solid var(--syn-frame); }
  .syn-activity-list li:last-child { border-block-end: 0; }
  /* Business/marketing: typography and hierarchy without forcing a dark look. */
  .syn-site-hero {
    position: relative; isolation: isolate; overflow: hidden;
    border: 1px solid var(--syn-frame); border-radius: var(--syn-radius);
    background: radial-gradient(ellipse at 80% 20%, var(--syn-accent-soft), transparent 56%), var(--syn-surface);
    color: var(--syn-text);
    padding: clamp(2rem, 6vw, 5rem);
  }
  .syn-site-hero::before {
    content: ""; position: absolute; inset-block-start: 0; inset-inline-start: 0;
    width: min(9rem, 40%); height: 3px; background: var(--syn-accent); pointer-events: none;
  }
  .syn-site-heading { font-family: var(--syn-font-display); font-size: clamp(2.3rem, 5.5vw, 4.7rem); line-height: 1.08; letter-spacing: -.055em; max-width: 16ch; }
  /* Optional editorial voice inspired by premium developer tooling; local serif only. */
  .syn-site-heading--editorial { font-family: ui-serif, Georgia, Cambria, "Times New Roman", serif; font-weight: 500; letter-spacing: -.045em; }
  .syn-site-heading strong { color: var(--syn-accent); }
  .syn-feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr)); gap: var(--syn-space-2); }
  .syn-feature-card { min-width: 0; padding: var(--syn-space-4); background: var(--syn-surface); color: var(--syn-text); border: 1px solid var(--syn-border-subtle); border-radius: var(--syn-radius); }
  .syn-feature-card > :first-child { margin-block-start: 0; }
  .syn-feature-card > :last-child { margin-block-end: 0; }
  .syn-cta-band { display: flex; align-items: center; flex-wrap: wrap; justify-content: space-between; gap: var(--syn-space-3); padding: var(--syn-space-4); background: var(--syn-accent-soft); color: var(--syn-text); border-inline-start: 3px solid var(--syn-accent); }
  /* Browser-rendered CLI/documentation panels; true CLI uses separate ANSI tokens. */
  .syn-terminal {
    --syn-terminal-bg: #0b1625;
    --syn-terminal-fg: #e6f4fa;
    --syn-terminal-muted: #b6c8d8;
    --syn-terminal-prompt: #85e7cf;
    border: 1px solid var(--syn-frame-strong); border-radius: var(--syn-radius);
    background: var(--syn-terminal-bg); color: var(--syn-terminal-fg);
    font: 400 .85rem/1.65 var(--syn-mono); min-width: 0; overflow: hidden;
  }
  .syn-terminal-bar { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem; align-items: center; padding: .55rem 1rem; border-block-end: 1px solid #385265; color: var(--syn-terminal-muted); font-size: .8125rem; }
  .syn-terminal-body { margin: 0; padding: 1.1rem; overflow-x: auto; }
  .syn-terminal-line { display: block; white-space: pre-wrap; overflow-wrap: anywhere; }
  .syn-terminal-prompt { color: var(--syn-terminal-prompt); }
  .syn-terminal-muted { color: var(--syn-terminal-muted); }
  .syn-terminal-command { color: #f9dfad; }
  .syn-terminal-success { color: #a1f1bf; }
  .syn-terminal-error { color: #ffb6b2; }
  .syn-terminal-warning { color: #ffe0a3; }
  .syn-terminal-path { color: #b2dcff; }
  .syn-terminal-meta { color: var(--syn-terminal-muted); font-size: .75em; letter-spacing: .06em; }
  .syn-terminal-title { font-weight: 650; color: var(--syn-terminal-fg); overflow-wrap: anywhere; }
  .syn-terminal-dots { display: inline-flex; gap: .35rem; align-items: center; }
  .syn-terminal-dots > span { display: block; width: .55rem; height: .55rem; border-radius: 50%; background: #ffb6b2; }
  .syn-terminal-dots > span:nth-child(2) { background: #ffe0a3; }
  .syn-terminal-dots > span:nth-child(3) { background: #a1f1bf; }
  .syn-terminal-output { display: block; white-space: pre-wrap; overflow-wrap: anywhere; }
  /* A static, non-blinking caret; it never suggests fake live input. */
  .syn-terminal-cursor { display: inline-block; width: .6ch; height: 1em; vertical-align: -.16em; background: currentColor; }

  /* Composable surface geometry; themes control colors, modifiers control shape. */
  .syn-frame--precision { position: relative; border: 1px solid var(--syn-frame-strong); }
  .syn-frame--precision::before {
    content: ""; position: absolute; inset-block-start: -1px; inset-inline-start: -1px;
    width: 3.5rem; height: 2px; background: var(--syn-accent); pointer-events: none;
  }
  .syn-frame--industrial { border-inline-start: 3px solid var(--syn-accent); background: linear-gradient(110deg, var(--syn-accent-soft), transparent 55%), var(--syn-surface); color: var(--syn-text); }
  .syn-frame--soft { border-radius: .75rem; box-shadow: 0 8px 30px rgb(0 0 0 / 6%); }

  /* Optional emphasis: a theme-colored accent line without extra markup or JS. */
  .syn-surface--accent {
    border-color: var(--syn-frame-strong);
    box-shadow: inset 0 3px var(--syn-accent);
    background: linear-gradient(160deg, var(--syn-accent-soft), transparent 45%), var(--syn-surface);
  }
  /* Use on small, interactive surfaces. No persistent will-change or transforms. */
  .syn-surface--lift {
    transition: border-color var(--syn-duration-fast) var(--syn-ease),
                box-shadow var(--syn-duration-fast) var(--syn-ease);
  }
  @media (hover: hover) and (pointer: fine) {
    .syn-surface--lift:where(:hover, :focus-within) {
      border-color: var(--syn-frame-strong);
      box-shadow: 0 8px 24px rgb(0 0 0 / 12%);
    }
    .syn-surface--accent.syn-surface--lift:where(:hover, :focus-within) {
      box-shadow: inset 0 3px var(--syn-accent), 0 8px 24px rgb(0 0 0 / 12%);
    }
  }
  .syn-surface--lift:focus-within { border-color: var(--syn-accent); }

  /* Opt in only on long, below-fold sections. A placeholder height avoids jumps. */
  .syn-defer-section {
    content-visibility: auto;
    contain-intrinsic-size: auto var(--syn-defer-size, 36rem);
  }
  @media print {
    .syn-defer-section { content-visibility: visible; contain-intrinsic-size: none; }
  }
  @media (prefers-reduced-motion: reduce) {
    .syn-surface--lift { transition: none; }
  }
  @media (min-width: 53rem) {
    .syn-app-shell { grid-template-columns: minmax(12.5rem, 15.5rem) minmax(0, 1fr); }
    .syn-app-rail { border-block-end: 0; border-inline-end: 1px solid var(--syn-frame); }
    .syn-app-nav { display: grid; }
  }
  @media (forced-colors: active) {
    .syn-app-card, .syn-site-hero, .syn-feature-card, .syn-terminal, .syn-frame--precision, .syn-frame--industrial { border-color: CanvasText; }
    .syn-frame--precision::before, .syn-site-hero::before { display: none; }
    .syn-surface--accent { box-shadow: none; border-block-start: 3px solid Highlight; background: Canvas; }
    .syn-surface--lift:where(:hover, :focus-within) { box-shadow: none; }
    .syn-terminal { forced-color-adjust: auto; }
  }
}
/* Optional original frame treatments: pure CSS, independently loadable.
   Pair .syn-frame with exactly one shape modifier. No canvas, images or JS.
   The cut shapes paint their own outlines; they do not mask the host's parent. */
@layer syn.geometry {
  .syn-frame {
    position: relative;
    z-index: 0;
    isolation: isolate;
    min-width: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: var(--syn-text);
  }
  .syn-frame::before,
  .syn-frame::after {
    content: "";
    position: absolute;
    pointer-events: none;
    z-index: -1;
    inset: 0;
  }
  /* Two clipped nested surfaces form a border along the diagonal edges;
     no parent-background-colored triangle is needed. */
  .syn-frame--bevel {
    --syn-frame-shape: polygon(
      var(--syn-frame-cut, 1rem) 0, calc(100% - var(--syn-frame-cut, 1rem)) 0,
      100% var(--syn-frame-cut, 1rem), 100% calc(100% - var(--syn-frame-cut, 1rem)),
      calc(100% - var(--syn-frame-cut, 1rem)) 100%, var(--syn-frame-cut, 1rem) 100%,
      0 calc(100% - var(--syn-frame-cut, 1rem)), 0 var(--syn-frame-cut, 1rem));
  }
  .syn-frame--notch {
    --syn-frame-shape: polygon(
      0 0, calc(100% - var(--syn-frame-cut, 1rem)) 0,
      100% var(--syn-frame-cut, 1rem), 100% 100%,
      var(--syn-frame-cut, 1rem) 100%, 0 calc(100% - var(--syn-frame-cut, 1rem)));
  }
  .syn-frame--bevel::before,
  .syn-frame--notch::before {
    clip-path: var(--syn-frame-shape);
    background: var(--syn-frame-outline, var(--syn-frame-strong));
  }
  .syn-frame--bevel::after,
  .syn-frame--notch::after {
    inset: var(--syn-frame-stroke, 1px);
    clip-path: var(--syn-frame-shape);
    background: var(--syn-frame-fill, var(--syn-surface));
  }
  /* Brackets don't obscure the content or assume an enclosing background. */
  .syn-frame--bracket::before {
    background: var(--syn-frame-fill, var(--syn-surface));
  }
  .syn-frame--bracket::after {
    --syn-bracket-size: clamp(.75rem, var(--syn-frame-cut, 1rem), 1.5rem);
    background:
      linear-gradient(var(--syn-accent), var(--syn-accent)) top left / var(--syn-bracket-size) var(--syn-frame-stroke, 1px) no-repeat,
      linear-gradient(var(--syn-accent), var(--syn-accent)) top left / var(--syn-frame-stroke, 1px) var(--syn-bracket-size) no-repeat,
      linear-gradient(var(--syn-accent), var(--syn-accent)) top right / var(--syn-bracket-size) var(--syn-frame-stroke, 1px) no-repeat,
      linear-gradient(var(--syn-accent), var(--syn-accent)) top right / var(--syn-frame-stroke, 1px) var(--syn-bracket-size) no-repeat,
      linear-gradient(var(--syn-accent), var(--syn-accent)) bottom left / var(--syn-bracket-size) var(--syn-frame-stroke, 1px) no-repeat,
      linear-gradient(var(--syn-accent), var(--syn-accent)) bottom left / var(--syn-frame-stroke, 1px) var(--syn-bracket-size) no-repeat,
      linear-gradient(var(--syn-accent), var(--syn-accent)) bottom right / var(--syn-bracket-size) var(--syn-frame-stroke, 1px) no-repeat,
      linear-gradient(var(--syn-accent), var(--syn-accent)) bottom right / var(--syn-frame-stroke, 1px) var(--syn-bracket-size) no-repeat;
  }
  /* Inner technical framing with no additional DOM elements. */
  .syn-frame--inset::before {
    border: var(--syn-frame-stroke, 1px) solid var(--syn-frame-outline, var(--syn-frame-strong));
    background: var(--syn-frame-fill, var(--syn-surface));
  }
  .syn-frame--inset::after {
    inset: .45rem;
    border: var(--syn-frame-stroke, 1px) solid var(--syn-accent);
    opacity: .55;
  }
  .syn-frame--circuit::before {
    border: var(--syn-frame-stroke, 1px) solid var(--syn-frame-outline, var(--syn-frame-strong));
    background: var(--syn-frame-fill, var(--syn-surface));
  }
  .syn-frame--circuit::after {
    background:
      linear-gradient(var(--syn-accent),var(--syn-accent)) top left / 38% 2px no-repeat,
      linear-gradient(var(--syn-accent),var(--syn-accent)) top left / 2px 28% no-repeat,
      linear-gradient(var(--syn-accent),var(--syn-accent)) bottom right / 28% 2px no-repeat,
      linear-gradient(var(--syn-accent),var(--syn-accent)) bottom right / 2px 38% no-repeat;
  }
  @media (forced-colors: active) {
    .syn-frame {
      border: 1px solid CanvasText;
      background: Canvas;
      color: CanvasText;
    }
    .syn-frame::before, .syn-frame::after { display: none; }
  }
}
/* Optional icon, Unicode and text-art presentations.
   No shipped glyphs, SVG assets, fonts or runtime JavaScript. */
@layer syn.symbols {
  /* Every rule is scoped to a Syntyr root, including root-self use.
     Place on an inline SVG or a wrapper around an SVG. Keep icon artwork
     vendor-controlled: do not force stroke, fill, or stroke-width. */
  :where(.syn-root .syn-icon, .syn-root.syn-icon) {
    display: inline-block;
    inline-size: var(--syn-icon-size, 1.25em);
    block-size: var(--syn-icon-size, 1.25em);
    flex: none;
    vertical-align: -.15em;
    color: inherit;
  }
  :where(.syn-root .syn-icon > svg, .syn-root.syn-icon > svg) {
    display: block;
    inline-size: 100%;
    block-size: 100%;
  }

  /* Symbols belong in the DOM; CSS does not generate meaningful content. */
  :where(.syn-root .syn-symbol, .syn-root.syn-symbol) {
    display: inline-block;
    line-height: 1;
    vertical-align: -.075em;
  }
  :where(.syn-root .syn-symbol--accent, .syn-root.syn-symbol--accent) { color: var(--syn-accent, currentColor); }
  :where(.syn-root .syn-symbol--muted, .syn-root.syn-symbol--muted) { color: var(--syn-muted, currentColor); }

  /* Preserve ASCII / Unicode box geometry, with horizontal scroll instead
     of wrapping and breaking columns on a narrow screen. */
  :where(.syn-root .syn-ascii, .syn-root.syn-ascii) {
    display: block;
    max-inline-size: 100%;
    margin: 0;
    overflow-x: auto;
    white-space: pre;
    font-family: var(--syn-mono, ui-monospace, monospace);
    font-variant-ligatures: none;
    font-kerning: none;
    line-height: 1.4;
    tab-size: 4;
  }
  :where(.syn-root .syn-ascii--accent, .syn-root.syn-ascii--accent) { color: var(--syn-accent, currentColor); }
  :where(.syn-root .syn-ascii--muted, .syn-root.syn-ascii--muted) { color: var(--syn-muted, currentColor); }
}
/* Optional static effects. */
@layer syn.effects {
  .syn-grid-effect {
    background-image:
      linear-gradient(to right, color-mix(in srgb, var(--syn-accent), transparent 95%) 1px, transparent 1px),
      linear-gradient(to bottom, color-mix(in srgb, var(--syn-accent), transparent 95%) 1px, transparent 1px);
    background-size: 2rem 2rem;
  }
  .syn-glow { box-shadow: 0 0 22px color-mix(in srgb, var(--syn-accent), transparent 88%); }
  /* Static atmospheric wash. This is decoration, not an interactive state. */
  .syn-gradient-wash {
    background-image:
      radial-gradient(ellipse at 15% 10%, color-mix(in srgb, var(--syn-accent), transparent 85%), transparent 55%),
      radial-gradient(ellipse at 90% 80%, color-mix(in srgb, var(--syn-accent-2), transparent 90%), transparent 60%);
  }
  /* Gradient horizon. */
  .syn-horizon {
    background-image:
      linear-gradient(to bottom, transparent 45%, var(--syn-bg) 100%),
      repeating-linear-gradient(to right, transparent 0 calc(3rem - 1px), color-mix(in srgb, var(--syn-accent), transparent 90%) calc(3rem - 1px) 3rem),
      repeating-linear-gradient(to bottom, transparent 0 calc(3rem - 1px), color-mix(in srgb, var(--syn-accent), transparent 90%) calc(3rem - 1px) 3rem),
      radial-gradient(ellipse at 70% 20%, var(--syn-accent-soft), transparent 55%);
  }
  /* Gradient atmosphere. */
  .syn-atmosphere {
    background-image:
      radial-gradient(ellipse at 85% 10%, var(--syn-accent-soft), transparent 55%),
      radial-gradient(ellipse at 15% 90%, color-mix(in srgb, var(--syn-accent-2), transparent 94%), transparent 60%);
    background-color: var(--syn-bg);
  }
  .syn-scanlines { position: relative; isolation: isolate; }
  .syn-scanlines::after {
    content: ""; pointer-events: none; position: absolute; inset: 0; z-index: 2;
    background: repeating-linear-gradient(to bottom, transparent 0 3px, rgb(0 0 0 / 10%) 3px 4px);
  }
  @media (forced-colors: active) {
    .syn-scanlines::after { display: none; }
    .syn-horizon, .syn-atmosphere, .syn-gradient-wash { background-image: none; }
  }
}
/* Optional, finite utilities: no generator, JS runtime, resets or network assets.
   Load after syntyr.core.css, or use syntyr.all.css. */
@layer syn.utilities {
  .syn-root :where(.syn-u-flex) { display: flex; min-width: 0; }
  .syn-root :where(.syn-u-grid) { display: grid; min-width: 0; }
  .syn-root :where(.syn-u-stack) { display: grid; gap: var(--syn-space-2); min-width: 0; }
  .syn-root :where(.syn-u-inline) { display: flex; flex-wrap: wrap; align-items: center; gap: var(--syn-space-2); }
  .syn-root :where(.syn-u-center) { align-items: center; justify-content: center; }
  .syn-root :where(.syn-u-between) { justify-content: space-between; }
  .syn-root :where(.syn-u-gap-1) { gap: var(--syn-space-1); }
  .syn-root :where(.syn-u-gap-2) { gap: var(--syn-space-2); }
  .syn-root :where(.syn-u-gap-3) { gap: var(--syn-space-3); }
  .syn-root :where(.syn-u-p-1) { padding: var(--syn-space-1); }
  .syn-root :where(.syn-u-p-2) { padding: var(--syn-space-2); }
  .syn-root :where(.syn-u-p-3) { padding: var(--syn-space-3); }
  .syn-root :where(.syn-u-mt-1) { margin-block-start: var(--syn-space-1); }
  .syn-root :where(.syn-u-mt-2) { margin-block-start: var(--syn-space-2); }
  .syn-root :where(.syn-u-mt-3) { margin-block-start: var(--syn-space-3); }
  .syn-root :where(.syn-u-sr-only) {
    position: absolute; width: 1px; height: 1px; padding: 0;
    margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0);
    white-space: nowrap; border: 0;
  }
}
/* Optional print treatment for reports and business documents.
   No print-time JavaScript, remote assets, or hidden essential content. */
@layer syn.print {
  @media print {
    .syn-root *, .syn-root *::before, .syn-root *::after {
      animation: none; transition: none;
    }
    :where(.syn-root, .syn-root [data-syn-theme]) {
      color-scheme: light;
      --syn-bg: #fff;
      --syn-surface: #fff;
      --syn-surface-hi: #f3f3f3;
      --syn-text: #111;
      --syn-muted: #333;
      --syn-accent: #111;
      --syn-accent-2: #333;
      --syn-on-accent: #fff;
      --syn-accent-soft: transparent;
      --syn-frame: #777;
      --syn-frame-strong: #555;
      --syn-danger: #750000;
      --syn-success: #174a2c;
      --syn-warning: #674500;
    }
    .syn-root { background: #fff; color: #111; }
    .syn-root :is(.syn-app-shell, .syn-layout) { display: block; }
    .syn-root :is(.syn-app-rail, .syn-app-nav, .syn-pagination, .syn-print-hide) { display: none; }
    .syn-root :is(.syn-table-wrap, .syn-terminal-body) { overflow: visible; }
    .syn-root :is(.syn-grid-effect, .syn-horizon, .syn-atmosphere, .syn-glow, .syn-site-hero, .syn-stage, .syn-panel) {
      background-image: none; box-shadow: none;
    }
    .syn-root .syn-scanlines::after { display: none; }
    .syn-root :is(.syn-button, .syn-page-link) {
      background: transparent; color: #111; box-shadow: none; border-color: #777;
    }
    .syn-root .syn-terminal, .syn-root .syn-terminal * {
      color: #111; background: #fff; box-shadow: none;
    }
    .syn-root :is(.syn-panel, .syn-app-card, .syn-feature-card, .syn-stat, .syn-price-card) {
      break-inside: avoid;
    }
    .syn-root a { text-decoration: underline; }
  }
}