/* ===========================================
   HEAVY DESIGN SYSTEM
   All styles in one file — no preprocessor needed
   =========================================== */

/* ===== 0. FONTS ===== */

@font-face {
  font-family: "Test American Grotesk";
  src: url("fonts/TestAmericanGrotesk-Light.otf") format("opentype");
  font-weight: 100;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Test American Grotesk";
  src: url("fonts/TestAmericanGrotesk-Regular.otf") format("opentype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Test American Grotesk";
  src: url("fonts/TestAmericanGrotesk-Bold.otf") format("opentype");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("fonts/JetBrainsMono-Light.woff2") format("woff2");
  font-weight: 100;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("fonts/JetBrainsMono-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("fonts/JetBrainsMono-Bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* ===== 1. VARIABLES ===== */

:root {
  /* Base Colors (Static) */
  --color-white: #FFFFFF;
  /* Typography */
  --font-primary: "Test American Grotesk", -apple-system, sans-serif;
  --font-secondary: "JetBrains Mono", monospace;
  --font-sans: "Inter", -apple-system, sans-serif;

  --line-height-base: 1.5;
  --line-height-tight: 1.2;
  --line-height-loose: 1.75;

  /* Optimal line length: 7-10 words ~ 45-75 characters */
  --measure: 65ch;

  /* Font Size Aliases */
  --font-size-body-xsm: var(--ui-10);
  --font-size-body-sm: var(--ui-12);
  --font-size-body: var(--ui-14);
  --font-size-body-lg: var(--ui-16);
  --font-size-body-xlg: var(--ui-20);
  --font-size-h6: var(--ui-16);
  --font-size-h5: var(--ui-20);
  --font-size-h4: var(--ui-24);
  --font-size-h3: var(--ui-28);
  --font-size-h2: var(--ui-32);
  --font-size-h1: var(--ui-40);
  --font-size-display: var(--ui-48);

  /* UI Scale (spacing, padding, margins) */
  --ui-0: 0px;
  --ui-2: 2px;
  --ui-4: 4px;
  --ui-8: 8px;
  --ui-10: 10px;
  --ui-12: 12px;
  --ui-14: 14px;
  --ui-16: 16px;
  --ui-20: 20px;
  --ui-24: 24px;
  --ui-28: 28px;
  --ui-32: 32px;
  --ui-40: 40px;
  --ui-48: 48px;
  --ui-60: 60px;
  --ui-64: 64px;
  --ui-72: 72px;

  /* Space (numeric) */
  --space-0: var(--ui-0);
  --space-2: var(--ui-2);
  --space-4: var(--ui-4);
  --space-8: var(--ui-8);
  --space-10: var(--ui-10);
  --space-12: var(--ui-12);
  --space-14: var(--ui-14);
  --space-16: var(--ui-16);
  --space-20: var(--ui-20);
  --space-24: var(--ui-24);
  --space-28: var(--ui-28);
  --space-32: var(--ui-32);
  --space-40: var(--ui-40);
  --space-48: var(--ui-48);
  --space-60: var(--ui-60);
  --space-72: var(--ui-72);

  /* Spacing (t-shirt) */
  --spacing-none: var(--ui-0);
  --spacing-xxs: var(--ui-2);
  --spacing-xs: var(--ui-4);
  --spacing-sm: var(--ui-8);
  --spacing-md: var(--ui-16);
  --spacing-lg: var(--ui-24);
  --spacing-xl: var(--ui-32);
  --spacing-2xl: var(--ui-40);
  --spacing-3xl: var(--ui-48);
  --spacing-4xl: var(--ui-64);

  /* Padding Aliases */
  --padding-xs: var(--ui-4);
  --padding-sm: var(--ui-8);
  --padding-md: var(--ui-16);
  --padding-lg: var(--ui-24);
  --padding-xl: var(--ui-32);
  --padding-2xl: var(--ui-48);

  /* Radius */
  --radius-none: 0px;
  --radius-xsm: 2px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 999px;

  /* Grid System */
  --grid-gutter: var(--ui-24);
  --grid-margin: var(--ui-16);

  /* Light Mode (Default) */
  --ui-bg-default: #F3F3F3;
  --ui-surface-default: #E8E8E8;
  --ui-border-default: #E8E8E8;
  --ui-border-strong: #F3F3F3;
  --ui-text-default: #5E5E5E;
  --ui-text-strong: #282828;
  --ui-text-disabled: #BBBBBB;
  --ui-action-primary: #282828;
  --ui-action-primary-hover: #4B4B4B;
  --ui-action-primary-active: #141414;
  --ui-action-primary-text: #F3F3F3;
  --ui-action-secondary: #E8E8E8;
  --ui-action-secondary-hover: #DDDDDD;
  --ui-action-secondary-text: #282828;

  /* Action Tokens (from Figma) */
  --action-primary-bg-default: #282828;
  --action-primary-bg-hover: #4B4B4B;
  --action-primary-bg-active: #5E5E5E;
  --action-primary-bg-disabled: #E8E8E8;
  --action-primary-text-default: #E8E8E8;
  --action-primary-text-disabled: #BBBBBB;
  --action-secondary-bg-default: #E8E8E8;
  --action-secondary-bg-hover: #DDDDDD;
  --action-secondary-bg-active: #BBBBBB;
  --action-secondary-bg-disabled: #E8E8E8;
  --action-secondary-text-default: #282828;
  --action-secondary-text-disabled: #BBBBBB;
  --action-tertiary-bg-default: #F3F3F3;
  --action-tertiary-bg-hover: #F3F3F3;
  --action-tertiary-bg-active: #F3F3F3;
  --action-tertiary-bg-disabled: #F3F3F3;
  --action-tertiary-border-default: #DDDDDD;
  --action-tertiary-border-hover: #BBBBBB;
  --action-tertiary-border-active: #A6A6A6;
  --action-tertiary-border-disabled: #DDDDDD;
  --action-tertiary-text-default: #282828;
  --action-tertiary-text-disabled: #BBBBBB;
  --action-danger-bg-default: #F3F3F3;
  --action-danger-bg-hover: #F3F3F3;
  --action-danger-bg-active: #F3F3F3;
  --action-danger-bg-disabled: #F3F3F3;
  --action-danger-border-default: #FFD2CD;
  --action-danger-border-hover: #FFB2AB;
  --action-danger-border-active: #FC7F79;
  --action-danger-border-disabled: #FFD2CD;
  --action-danger-text-default: #DE1135;
  --action-danger-text-disabled: #FFB2AB;

  /* Forms Input Tokens (from Figma) */
  --forms-input-bg-default: #E8E8E8;
  --forms-input-text-default: #868686;
  --forms-input-text-value: #282828;
  --forms-input-text-disabled: #BBBBBB;
  --forms-input-icon-default: #868686;
  --forms-input-icon-disabled: #BBBBBB;
  --forms-input-border-hover: #BBBBBB;
  --forms-input-border-focus: #868686;
  --forms-input-border-success: #0E8345;
  --forms-input-border-error: #DE1135;
  --forms-input-text-success: #0E8345;
  --forms-input-text-error: #DE1135;
  --select-chevron: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23868686' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  --select-chevron-disabled: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23BBBBBB' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");

  --ui-feedback-success: #0E8345;
  --ui-feedback-warning: #FC823A;
  --ui-feedback-danger: #DE1135;
  --ui-feedback-info: #007F8C;

}

/* Dark Mode */
[data-theme="dark"] {
  --ui-bg-default: #141414;
  --ui-surface-default: #282828;
  --ui-border-default: #282828;
  --ui-border-strong: #141414;
  --ui-text-default: #DDDDDD;
  --ui-text-strong: #F3F3F3;
  --ui-text-disabled: #727272;
  --ui-action-primary: #F3F3F3;
  --ui-action-primary-hover: #E8E8E8;
  --ui-action-primary-active: #DDDDDD;
  --ui-action-primary-text: #282828;
  --ui-action-secondary: #282828;
  --ui-action-secondary-hover: #4B4B4B;
  --ui-action-secondary-text: #F3F3F3;

  /* Action Tokens (from Figma) */
  --action-primary-bg-default: #E8E8E8;
  --action-primary-bg-hover: #BBBBBB;
  --action-primary-bg-active: #868686;
  --action-primary-bg-disabled: #282828;
  --action-primary-text-default: #282828;
  --action-primary-text-disabled: #4B4B4B;
  --action-secondary-bg-default: #282828;
  --action-secondary-bg-hover: #4B4B4B;
  --action-secondary-bg-active: #5E5E5E;
  --action-secondary-bg-disabled: #282828;
  --action-secondary-text-default: #E8E8E8;
  --action-secondary-text-disabled: #4B4B4B;
  --action-tertiary-bg-default: #141414;
  --action-tertiary-bg-hover: #141414;
  --action-tertiary-bg-active: #141414;
  --action-tertiary-bg-disabled: #141414;
  --action-tertiary-border-default: #282828;
  --action-tertiary-border-hover: #4B4B4B;
  --action-tertiary-border-active: #5E5E5E;
  --action-tertiary-border-disabled: #282828;
  --action-tertiary-text-default: #E8E8E8;
  --action-tertiary-text-disabled: #4B4B4B;
  --action-danger-bg-default: #141414;
  --action-danger-bg-hover: #141414;
  --action-danger-bg-active: #141414;
  --action-danger-bg-disabled: #141414;
  --action-danger-border-default: #520810;
  --action-danger-border-hover: #950F22;
  --action-danger-border-active: #BB032A;
  --action-danger-border-disabled: #520810;
  --action-danger-text-default: #F83446;
  --action-danger-text-disabled: #520810;

  /* Forms Input Tokens (from Figma) */
  --forms-input-bg-default: #282828;
  --forms-input-text-default: #5E5E5E;
  --forms-input-text-value: #E8E8E8;
  --forms-input-text-disabled: #4B4B4B;
  --forms-input-icon-default: #BBBBBB;
  --forms-input-icon-disabled: #4B4B4B;
  --forms-input-border-hover: #4B4B4B;
  --forms-input-border-focus: #727272;
  --forms-input-border-success: #0E8345;
  --forms-input-border-error: #DE1135;
  --forms-input-text-success: #0E8345;
  --forms-input-text-error: #DE1135;
  --select-chevron: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23BBBBBB' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  --select-chevron-disabled: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%234B4B4B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");

  --ui-feedback-success: #06C167;
  --ui-feedback-warning: #FFB48C;
  --ui-feedback-danger: #FC7F79;
  --ui-feedback-info: #01B8CA;

}

/* Responsive Grid Margins */
@media (min-width: 768px) {
  :root {
    --grid-margin: var(--ui-24);
  }
}

/* ===== 2. RESET ===== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-secondary, monospace);
  background: var(--ui-bg-default);
  color: var(--ui-text-strong);
  line-height: var(--line-height-base, 1.5);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

ul,
ol {
  list-style: none;
}

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

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

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

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

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

:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--ui-action-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===== 3. TYPOGRAPHY ===== */

h1, .h1, h2, .h2, h3, .h3, h4, .h4, h5, .h5, h6, .h6 {
  font-family: var(--font-primary);
  font-weight: 700;
  line-height: var(--line-height-tight);
}

h1, .h1 { font-size: var(--font-size-display); letter-spacing: -0.02em; margin-bottom: var(--spacing-sm); }
h2, .h2 { font-size: var(--font-size-h2); letter-spacing: -0.01em; }
h3, .h3 { font-size: var(--font-size-h3); }
h4, .h4 { font-size: var(--font-size-h4); }
h5, .h5 { font-size: var(--font-size-h5); }
h6, .h6 { font-size: var(--font-size-h6); }

p, .body {
  font-size: var(--font-size-body);
  line-height: var(--line-height-base);
}

.body-sm {
  font-size: var(--font-size-body-sm);
  line-height: var(--line-height-base);
}

.body-xsm {
  font-size: var(--font-size-body-xsm);
  line-height: var(--line-height-base);
}

.font-primary { font-family: var(--font-primary); }
.font-secondary { font-family: var(--font-secondary); }
.font-sans { font-family: var(--font-sans); }

.font-thin { font-weight: 100; }
.font-extralight { font-weight: 200; }
.font-light { font-weight: 300; }
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }
.font-black { font-weight: 900; }

.text-default { color: var(--ui-text-default); }
.text-strong { color: var(--ui-text-strong); }
.text-muted { color: var(--ui-text-default); }
.text-disabled { color: var(--ui-text-disabled); }

.uppercase { text-transform: uppercase; }
.lowercase { text-transform: lowercase; }
.capitalize { text-transform: capitalize; }

.tracking-tight { letter-spacing: -0.02em; }
.tracking-normal { letter-spacing: 0; }
.tracking-wide { letter-spacing: 0.05em; }
.tracking-wider { letter-spacing: 0.1em; }

.leading-none { line-height: 1; }
.leading-tight { line-height: var(--line-height-tight); }
.leading-normal { line-height: var(--line-height-base); }
.leading-loose { line-height: var(--line-height-loose); }

.heavy-label {
  font-size: var(--font-size-body-xsm);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ui-text-default);
}

.measure { max-width: var(--measure, 65ch); }
.measure-narrow { max-width: 45ch; }
.measure-wide { max-width: 75ch; }

/* ===== 4. GRID ===== */

.container {
  width: 100%;
  padding-inline: var(--grid-margin);
}

.heavy-grid {
  display: grid;
  column-gap: var(--grid-gutter);
  row-gap: var(--space-48);
}

.heavy-grid--auto { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.heavy-grid--auto-sm { grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); }
.heavy-grid--auto-lg { grid-template-columns: repeat(auto-fit, minmax(min(100%, 400px), 1fr)); }

.heavy-grid--2 { grid-template-columns: repeat(2, 1fr); }
.heavy-grid--3 { grid-template-columns: repeat(3, 1fr); }
.heavy-grid--4 { grid-template-columns: repeat(4, 1fr); }
.heavy-grid--6 { grid-template-columns: repeat(6, 1fr); }
.heavy-grid--10 { grid-template-columns: repeat(10, 1fr); }
.heavy-grid--12 { grid-template-columns: repeat(12, 1fr); }
.heavy-grid--baseline { align-items: baseline; }

.heavy-col-span-1 { grid-column-end: span 1; }
.heavy-col-span-2 { grid-column-end: span 2; }
.heavy-col-span-3 { grid-column-end: span 3; }
.heavy-col-span-4 { grid-column-end: span 4; }
.heavy-col-span-6 { grid-column-end: span 6; }
.heavy-col-span-8 { grid-column-end: span 8; }
.heavy-col-span-9 { grid-column-end: span 9; }
.heavy-col-span-full { grid-column: 1 / -1; }

.heavy-gap-1 { gap: var(--space-8); }
.heavy-gap-2 { gap: var(--space-16); }
.heavy-gap-3 { gap: var(--space-24); }
.heavy-gap-4 { gap: var(--space-32); }
.heavy-gap-5 { gap: var(--space-40); }
.heavy-gap-6 { gap: var(--space-48); }

/* ===== 5. LAYOUT UTILITIES ===== */

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }

.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.items-baseline { align-items: baseline; }

.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }

.m-0 { margin: 0; }
.m-1 { margin: var(--space-4); }
.m-2 { margin: var(--space-8); }
.m-3 { margin: var(--space-16); }
.m-4 { margin: var(--space-24); }
.m-5 { margin: var(--space-32); }
.m-6 { margin: var(--space-48); }

.mx-auto { margin-inline: auto; }
.my-0 { margin-block: 0; }
.my-1 { margin-block: var(--space-4); }
.my-2 { margin-block: var(--space-8); }
.my-3 { margin-block: var(--space-16); }
.my-4 { margin-block: var(--space-24); }
.my-5 { margin-block: var(--space-32); }
.my-6 { margin-block: var(--space-48); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-4); }
.mb-2 { margin-bottom: var(--space-8); }
.mb-3 { margin-bottom: var(--space-16); }
.mb-4 { margin-bottom: var(--space-24); }
.mb-5 { margin-bottom: var(--space-32); }
.mb-6 { margin-bottom: var(--space-48); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-4); }
.mt-2 { margin-top: var(--space-8); }
.mt-3 { margin-top: var(--space-16); }
.mt-4 { margin-top: var(--space-24); }
.mt-5 { margin-top: var(--space-32); }
.mt-6 { margin-top: var(--space-48); }

.p-0 { padding: 0; }
.p-1 { padding: var(--space-4); }
.p-2 { padding: var(--space-8); }
.p-3 { padding: var(--space-16); }
.p-4 { padding: var(--space-24); }
.p-5 { padding: var(--space-32); }
.p-6 { padding: var(--space-48); }

.px-0 { padding-inline: 0; }
.px-1 { padding-inline: var(--space-4); }
.px-2 { padding-inline: var(--space-8); }
.px-3 { padding-inline: var(--space-16); }
.px-4 { padding-inline: var(--space-24); }
.px-5 { padding-inline: var(--space-32); }
.px-6 { padding-inline: var(--space-48); }

.py-0 { padding-block: 0; }
.py-1 { padding-block: var(--space-4); }
.py-2 { padding-block: var(--space-8); }
.py-3 { padding-block: var(--space-16); }
.py-4 { padding-block: var(--space-24); }
.py-5 { padding-block: var(--space-32); }
.py-6 { padding-block: var(--space-48); }

.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

.hidden { display: none; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }

.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

.block { display: block; }
.inline-block { display: inline-block; }
.inline { display: inline; }

/* ===== 6. SPACING UTILITIES ===== */

.heavy-stack > * + * { margin-top: var(--stack-space, var(--space-16)); }
.heavy-stack--sm > * + * { margin-top: var(--space-8); }
.heavy-stack--md > * + * { margin-top: var(--space-16); }
.heavy-stack--lg > * + * { margin-top: var(--space-24); }
.heavy-stack--xl > * + * { margin-top: var(--space-32); }

.heavy-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cluster-space, var(--space-16));
  align-items: center;
}

.heavy-with-sidebar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-24);

  & > :first-child {
    flex-basis: var(--sidebar-width, 280px);
    flex-grow: 1;
  }

  & > :last-child {
    flex-basis: 0;
    flex-grow: 999;
    min-inline-size: 50%;
  }
}

.heavy-center {
  box-sizing: content-box;
  max-inline-size: var(--measure);
  margin-inline: auto;
  padding-inline: var(--space-16);
}

.heavy-cover {
  display: flex;
  flex-direction: column;
  min-block-size: 100vh;
  padding: var(--space-16);

  & > * { margin-block: var(--space-16); }
  & > :first-child:not(.heavy-cover__centered) { margin-block-start: 0; }
  & > :last-child:not(.heavy-cover__centered) { margin-block-end: 0; }
  & > .heavy-cover__centered { margin-block: auto; }
}

.heavy-box { padding: var(--space-16); }
.heavy-box--sm { padding: var(--space-8); }
.heavy-box--lg { padding: var(--space-24); }
.heavy-box--xl { padding: var(--space-32); }

/* ===== 7. ACCESSIBILITY ===== */

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

.sr-only-focusable:focus,
.sr-only-focusable:focus-within {
  position: static;
  width: auto;
  height: auto;
  padding: var(--space-8);
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  background: var(--ui-action-primary);
  color: var(--color-white);
  padding: var(--space-8) var(--space-16);
  z-index: 9999;
  transform: translateY(-100%);
  transition: transform 0.2s ease-in-out;

  &:focus { transform: translateY(0); }
}

.focus-ring:focus-visible {
  outline: 2px solid var(--ui-action-primary);
  outline-offset: 2px;
}

.focus-ring-inset:focus-visible {
  outline: 2px solid var(--ui-action-primary);
  outline-offset: -2px;
}

.no-mouse-focus:focus:not(:focus-visible) {
  outline: none;
  box-shadow: none;
}

.touch-target { min-height: 44px; min-width: 44px; }
.touch-target-sm { min-height: 24px; min-width: 24px; }

.contrast-high {
  color: var(--ui-text-strong);
  background: var(--ui-bg-default);
}

.contrast-invert {
  color: var(--ui-bg-default);
  background: var(--ui-text-strong);
}

@media (prefers-reduced-motion: reduce) {
  .motion-reduce {
    animation: none !important;
    transition: none !important;
  }
}

@media (forced-colors: active) {
  .forced-colors-outline {
    outline: 2px solid currentColor;
    outline-offset: 2px;
  }
}

/* ===== 8. ELEMENTS ===== */

/* --- 8a. Buttons --- */

.heavy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  padding: var(--space-12);
  font-family: var(--font-secondary);
  font-size: var(--font-size-body-sm);
  font-weight: 400;
  line-height: 1;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;

  &:focus-visible {
    outline: 2px solid var(--ui-action-primary);
    outline-offset: 2px;
  }
}

.heavy-btn--primary {
  background: var(--action-primary-bg-default);
  color: var(--action-primary-text-default);

  &:hover:not(:disabled) { background: var(--action-primary-bg-hover); }
  &:active:not(:disabled) { background: var(--action-primary-bg-active); }

  &:disabled {
    background: var(--action-primary-bg-disabled);
    color: var(--action-primary-text-disabled);
    cursor: not-allowed;
  }
}

.heavy-btn--secondary {
  background: var(--action-secondary-bg-default);
  color: var(--action-secondary-text-default);

  &:hover:not(:disabled) { background: var(--action-secondary-bg-hover); }
  &:active:not(:disabled) { background: var(--action-secondary-bg-active); }

  &:disabled {
    background: var(--action-secondary-bg-disabled);
    color: var(--action-secondary-text-disabled);
    cursor: not-allowed;
  }
}

.heavy-btn--danger {
  background: var(--action-danger-bg-default);
  color: var(--action-danger-text-default);
  border-color: var(--action-danger-border-default);

  &:hover:not(:disabled) { border-color: var(--action-danger-border-hover); }
  &:active:not(:disabled) { border-color: var(--action-danger-border-active); }

  &:disabled {
    background: var(--action-danger-bg-disabled);
    color: var(--action-danger-text-disabled);
    border-color: var(--action-danger-border-disabled);
    cursor: not-allowed;
  }
}

.heavy-btn--tertiary {
  background: var(--action-tertiary-bg-default);
  color: var(--action-tertiary-text-default);
  border-color: var(--action-tertiary-border-default);

  &:hover:not(:disabled) { border-color: var(--action-tertiary-border-hover); }
  &:active:not(:disabled) { border-color: var(--action-tertiary-border-active); }

  &:disabled {
    background: var(--action-tertiary-bg-disabled);
    color: var(--action-tertiary-text-disabled);
    border-color: var(--action-tertiary-border-disabled);
    cursor: not-allowed;
  }
}

.heavy-btn--xs {
  padding: var(--space-4);
  font-size: var(--font-size-body-xsm);
  border-radius: var(--radius-xsm);
}

.heavy-btn--sm {
  padding: var(--space-8);
  font-size: var(--font-size-body-xsm);
}

.heavy-btn--lg {
  padding: var(--space-16);
  font-size: var(--font-size-body);
  border-radius: var(--radius-md);
}

.heavy-btn--block { width: 100%; }

.heavy-btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--ui-text-default);
  transition: background-color 0.15s ease, color 0.15s ease;

  &:hover {
    background: var(--ui-surface-default);
    color: var(--ui-text-strong);
  }
}

.heavy-btn-group {
  display: flex;
  gap: var(--space-4);
}

/* --- 8a-ii. Select --- */

.heavy-select {
  appearance: none;
  display: inline-block;
  padding: var(--space-12);
  padding-right: 32px;
  font-family: var(--font-secondary);
  font-size: var(--font-size-body-sm);
  font-weight: 400;
  line-height: 1;
  color: var(--forms-input-text-value);
  background-color: var(--forms-input-bg-default);
  background-image: var(--select-chevron);
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 12px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.15s ease;

  &:hover:not(:disabled) {
    border-color: var(--forms-input-border-hover);
  }

  &:focus {
    outline: none;
    border-color: var(--forms-input-border-focus);
  }

  &:disabled {
    color: var(--forms-input-text-disabled);
    background-image: var(--select-chevron-disabled);
    cursor: not-allowed;
  }
}

.heavy-select--xs {
  padding: var(--space-4);
  padding-right: 22px;
  font-size: var(--font-size-body-xsm);
  border-radius: var(--radius-xsm);
  background-position: right 4px center;
  background-size: 10px;
}

.heavy-select--sm {
  padding: var(--space-8);
  padding-right: 26px;
  font-size: var(--font-size-body-xsm);
  background-position: right 8px center;
  background-size: 10px;
}

.heavy-select--lg {
  padding: var(--space-16) var(--space-12);
  padding-right: 34px;
  font-size: var(--font-size-body);
  border-radius: var(--radius-md);
  background-size: 14px;
}

/* --- 8a-iii. Search --- */

.heavy-search {
  position: relative;
  display: inline-flex;
  align-items: center;

  &::before {
    content: "";
    position: absolute;
    left: var(--space-12);
    width: 12px;
    height: 12px;
    flex-shrink: 0;
    background-color: var(--forms-input-icon-default);
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.3-4.3'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.3-4.3'/%3E%3C/svg%3E");
    mask-size: contain;
    mask-repeat: no-repeat;
    pointer-events: none;
    z-index: 1;
  }

  & input {
    width: 100%;
    padding: var(--space-12);
    padding-left: calc(var(--space-12) + 12px + var(--space-8));
    font-family: var(--font-secondary);
    font-size: var(--font-size-body-sm);
    font-weight: 400;
    line-height: 1;
    color: var(--forms-input-text-value);
    background-color: var(--forms-input-bg-default);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    transition: border-color 0.15s ease;

    &::placeholder { color: var(--forms-input-text-default); }
    &:hover:not(:disabled) { border-color: var(--forms-input-border-hover); }

    &:focus {
      outline: none;
      border-color: var(--forms-input-border-focus);
    }

    &:disabled {
      color: var(--forms-input-text-disabled);
      cursor: not-allowed;
    }
  }

  &:has(input:disabled)::before {
    background-color: var(--forms-input-icon-disabled);
  }
}

.heavy-search--xs {
  &::before { left: var(--space-4); width: 10px; height: 10px; }

  & input {
    padding: var(--space-4);
    padding-left: calc(var(--space-4) + 10px + var(--space-4));
    font-size: var(--font-size-body-xsm);
    border-radius: var(--radius-xsm);
  }
}

.heavy-search--sm {
  &::before { left: var(--space-8); width: 10px; height: 10px; }

  & input {
    padding: var(--space-8);
    padding-left: calc(var(--space-8) + 10px + var(--space-4));
    font-size: var(--font-size-body-xsm);
  }
}

.heavy-search--lg {
  &::before { left: var(--space-12); width: 14px; height: 14px; }

  & input {
    padding: var(--space-16) var(--space-12);
    padding-left: calc(var(--space-12) + 14px + var(--space-8));
    font-size: var(--font-size-body);
    border-radius: var(--radius-md);
  }
}

/* --- 8b. Form Controls --- */

.heavy-form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  grid-column: 1 / 5;
}

.heavy-form-label {
  font-size: var(--font-size-body-sm);
  font-weight: 700;
  color: var(--ui-text-strong);
}

.heavy-form-label--required::after {
  content: " *";
  color: var(--ui-feedback-danger);
}

.heavy-form-input {
  padding: var(--space-12);
  font-family: var(--font-secondary);
  font-size: var(--font-size-body-sm);
  font-weight: 400;
  line-height: 1;
  color: var(--forms-input-text-value);
  background-color: var(--forms-input-bg-default);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  transition: border-color 0.15s ease;

  &::placeholder { color: var(--forms-input-text-default); }

  &:hover:not(:disabled) {
    border-color: var(--forms-input-border-hover);
  }

  &:focus {
    outline: none;
    border-color: var(--forms-input-border-focus);
  }

  &:disabled {
    color: var(--forms-input-text-disabled);
    cursor: not-allowed;
  }
}

.heavy-form-input--xs {
  padding: var(--space-4);
  font-size: var(--font-size-body-xsm);
  border-radius: var(--radius-xsm);
}

.heavy-form-input--sm {
  padding: var(--space-8);
  font-size: var(--font-size-body-xsm);
}

.heavy-form-input--lg {
  padding: var(--space-16) var(--space-12);
  font-size: var(--font-size-body);
  border-radius: var(--radius-md);
}

.heavy-form-textarea {
  width: 100%;
  min-height: 100px;
  resize: vertical;
}

.heavy-form-select {
  appearance: none;
  background-image: var(--select-chevron);
  background-repeat: no-repeat;
  background-position: right var(--space-12) center;
  background-size: 12px;
  padding-right: 32px;
}

.heavy-form-check {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.heavy-form-check-input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--ui-action-primary);
}

.heavy-form-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  cursor: pointer;

  & input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
  }

  & .heavy-form-toggle-track {
    width: 36px;
    height: 20px;
    background: var(--ui-border-default);
    border-radius: var(--radius-full);
    position: relative;
    transition: background-color 0.15s ease;

    &::after {
      content: "";
      position: absolute;
      top: 2px;
      left: 2px;
      width: 16px;
      height: 16px;
      background: var(--color-white);
      border-radius: var(--radius-full);
      transition: transform 0.15s ease;
    }
  }

  & input:checked + .heavy-form-toggle-track {
    background: var(--ui-action-primary);

    &::after { transform: translateX(16px); }
  }
}

.heavy-form-file {
  & input[type="file"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
  }

  & .heavy-form-file-trigger {
    display: inline-flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--padding-sm) var(--padding-md);
    font-size: var(--font-size-body-sm);
    font-weight: 400;
    line-height: 1;
    text-transform: uppercase;
    color: var(--ui-text-default);
    background: var(--ui-surface-default);
    border: 1px dashed var(--ui-border-default);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: border-color 0.15s ease;

    &:hover { border-color: var(--ui-text-default); }
  }

  &.heavy-form-file--xs .heavy-form-file-trigger {
    padding: var(--space-4);
    font-size: var(--font-size-body-xsm);
    border-radius: var(--radius-xsm);
  }

  &.heavy-form-file--sm .heavy-form-file-trigger {
    padding: var(--space-8);
    font-size: var(--font-size-body-xsm);
  }

  &.heavy-form-file--lg .heavy-form-file-trigger {
    padding: var(--space-16);
    font-size: var(--font-size-body);
    border-radius: var(--radius-md);
  }
}


.heavy-form-hint {
  font-size: var(--font-size-body-xsm);
  color: var(--ui-text-default);
}

.heavy-form-hint--error { color: var(--ui-feedback-danger); }
.heavy-form-hint--success { color: var(--ui-feedback-success); }

.heavy-form-error {
  font-size: var(--font-size-body-sm);
  color: var(--ui-feedback-danger);
}

.heavy-form-input--error { border-color: var(--forms-input-border-error); color: var(--forms-input-text-error); }
.heavy-form-input--success { border-color: var(--forms-input-border-success); color: var(--forms-input-text-success); }

/* --- 8c. Data Display --- */

.heavy-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--padding-xs) var(--padding-sm);
  font-size: var(--font-size-body-xsm);
  font-weight: 500;
  letter-spacing: 0.025em;
  border-radius: var(--radius-sm);
  background: var(--ui-surface-default);
  color: var(--ui-text-default);
}

.heavy-badge--success { background: var(--ui-feedback-success); color: var(--color-white); }
.heavy-badge--warning { background: var(--ui-feedback-warning); color: var(--color-white); }
.heavy-badge--danger { background: var(--ui-feedback-danger); color: var(--color-white); }
.heavy-badge--info { background: var(--ui-feedback-info); color: var(--color-white); }

.heavy-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.heavy-stat-value {
  font-family: var(--font-primary);
  font-size: var(--font-size-h2);
  font-weight: 700;
  line-height: var(--line-height-tight);
  letter-spacing: -0.01em;
  color: var(--ui-text-strong);
  font-variant-numeric: tabular-nums;
}

.heavy-stat-label {
  font-size: var(--font-size-body-xsm);
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--ui-text-default);
  margin-top: var(--space-4);
}

.heavy-stat-unit {
  font-size: var(--font-size-h5);
  font-weight: 400;
  color: var(--ui-text-default);
}

.heavy-stat-delta {
  font-size: var(--font-size-body-sm);

}

.heavy-stat-delta--positive { color: var(--ui-feedback-success); }
.heavy-stat-delta--negative { color: var(--ui-feedback-danger); }

.heavy-kv {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: var(--padding-sm) 0;
  border-bottom: 1px solid var(--ui-border-default);

  &:last-child { border-bottom: none; }
}

.heavy-kv-key {
  font-size: var(--font-size-body-sm);
  color: var(--ui-text-default);
}

.heavy-kv-value {
  font-size: var(--font-size-body-sm);
  font-weight: 600;
  color: var(--ui-text-strong);
  text-align: right;
}

.heavy-list-item {
  padding: var(--padding-sm) var(--padding-md);
  border-bottom: 1px solid var(--ui-border-default);
  transition: background-color 0.15s ease;

  &:last-child { border-bottom: none; }
  &:hover { background: var(--ui-surface-default); }
}

.heavy-progress {
  width: 100%;
  height: 8px;
  background: var(--ui-surface-default);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.heavy-progress-bar {
  height: 100%;
  background: var(--ui-action-primary);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

/* --- 8d. Feedback --- */

.heavy-status-msg {
  padding: var(--padding-sm) var(--padding-md);
  font-size: var(--font-size-body-sm);
  border-radius: var(--radius-sm);
  border: 1px solid var(--ui-border-default);
  background: var(--ui-surface-default);
  color: var(--ui-text-strong);
}

.heavy-status-msg--success { border-color: var(--ui-feedback-success); color: var(--ui-feedback-success); }
.heavy-status-msg--error { border-color: var(--ui-feedback-danger); color: var(--ui-feedback-danger); }
.heavy-status-msg--warning { border-color: var(--ui-feedback-warning); color: var(--ui-feedback-warning); }
.heavy-status-msg--info { border-color: var(--ui-feedback-info); color: var(--ui-feedback-info); }

.heavy-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--padding-2xl) var(--padding-md);
  text-align: center;
}

.heavy-empty-state-title {
  font-size: var(--font-size-h5);
  font-weight: 600;
  color: var(--ui-text-strong);
}

.heavy-empty-state-description {
  font-size: var(--font-size-body-sm);
  color: var(--ui-text-default);
  margin-top: var(--space-4);
}

.heavy-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--ui-border-default);
  border-top-color: var(--ui-action-primary);
  border-radius: var(--radius-full);
  animation: spin 0.6s linear infinite;
}

.heavy-skeleton {
  background: linear-gradient(
    90deg,
    var(--ui-bg-default) 25%,
    var(--ui-surface-default) 50%,
    var(--ui-bg-default) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

/* --- 8e. Navigation --- */

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

.heavy-tab {
  padding: var(--padding-sm) var(--padding-md);
  font-size: var(--font-size-body-sm);
  color: var(--ui-text-default);
  text-decoration: none;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;

  &:hover { color: var(--ui-text-strong); }
}

.heavy-tab--active {
  color: var(--ui-text-strong);
  border-bottom-color: var(--ui-action-primary);
}

.heavy-breadcrumbs {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  font-size: var(--font-size-body-sm);
}

.heavy-breadcrumbs-separator { color: var(--ui-text-disabled); }

.heavy-breadcrumbs-link {
  color: var(--ui-text-default);
  text-decoration: none;

  &:hover { color: var(--ui-text-strong); }
}

.heavy-breadcrumbs-current { color: var(--ui-text-strong); }

.heavy-nav-link {
  font-size: var(--font-size-body-sm);
  color: var(--ui-text-default);
  text-decoration: none;
  transition: color 0.15s ease;

  &:hover { color: var(--ui-text-strong); }
}

.heavy-nav-link--active {
  color: var(--ui-text-strong);
  font-weight: 600;
}

.heavy-chip {
  display: inline-flex;
  align-items: center;
  padding: var(--padding-xs) var(--padding-sm);
  font-size: var(--font-size-body-xsm);
  color: var(--ui-text-default);
  background: transparent;
  border: 1px solid var(--ui-border-default);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;

  &:hover {
    border-color: var(--ui-text-default);
    color: var(--ui-text-strong);
  }
}

.heavy-chip--active {
  background: var(--ui-action-primary);
  border-color: var(--ui-action-primary);
  color: var(--color-white);
}

/* --- 8f. Layout --- */

.heavy-card {
  background: var(--ui-surface-default);
  border: 1px solid var(--ui-border-default);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.heavy-card-header {
  padding: var(--padding-md);
  border-bottom: 1px solid var(--ui-border-default);
}

.heavy-card-body { padding: var(--padding-md); }

.heavy-card-footer {
  padding: var(--padding-md);
  border-top: 1px solid var(--ui-border-default);
}

.heavy-card-title {
  font-size: var(--font-size-h5);
  font-weight: 600;
  color: var(--ui-text-strong);
}

.heavy-card-subtitle {
  font-size: var(--font-size-body-sm);
  color: var(--ui-text-default);
  margin-top: var(--space-4);
}

.heavy-card--elevated {
  border: none;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
}

.heavy-card--interactive {
  cursor: pointer;
  transition: box-shadow 0.15s ease, transform 0.15s ease;

  &:hover {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
    transform: translateY(-1px);
  }
}

.collapsible {
  border: 1px solid var(--ui-border-default);
  border-radius: var(--radius-sm);

  & summary {
    padding: var(--padding-sm) var(--padding-md);
    font-size: var(--font-size-body-sm);
    color: var(--ui-text-strong);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-color 0.15s ease;

    &:hover { background: var(--ui-surface-default); }

    &::after {
      content: "+";
      font-size: var(--font-size-body);
      color: var(--ui-text-default);
    }

    &::-webkit-details-marker { display: none; }
  }

  &[open] summary::after { content: "\2212"; }

  & > :last-child:not(summary) {
    padding: var(--padding-md);
    border-top: 1px solid var(--ui-border-default);
  }
}

.divider {
  border: none;
  border-top: 1px solid var(--ui-border-default);
  margin: var(--space-24) 0;
}

.heavy-section-header {
  font-size: var(--font-size-body-xsm);
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--ui-text-default);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--ui-border-default);
}

/* --- 8g. Animation --- */

:root {
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.45, 0, 0.55, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slide-up {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slide-down {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scale-in {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.animate-fade-in { animation: fade-in 0.2s var(--ease-out) forwards; }
.animate-slide-up { animation: slide-up 0.3s var(--ease-out) forwards; }
.animate-slide-down { animation: slide-down 0.3s var(--ease-out) forwards; }
.animate-scale-in { animation: scale-in 0.2s var(--ease-spring) forwards; }
.animate-spin { animation: spin 1s linear infinite; }

.stagger-children > * {
  opacity: 0;
  animation: slide-up 0.3s var(--ease-out) forwards;
}

.stagger-children > *:nth-child(1) { animation-delay: 0ms; }
.stagger-children > *:nth-child(2) { animation-delay: 50ms; }
.stagger-children > *:nth-child(3) { animation-delay: 100ms; }
.stagger-children > *:nth-child(4) { animation-delay: 150ms; }
.stagger-children > *:nth-child(5) { animation-delay: 200ms; }
.stagger-children > *:nth-child(6) { animation-delay: 250ms; }