/* ============================================================================
 * Canonical Design System Stylesheet
 * ========================================================================== */

:root {
  color-scheme: light;

  /* Typography */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Primitive Palette — Greyscale */
  --app-grey-50: #ffffff;
  --app-grey-100: #fafafa;
  --app-grey-200: #f7f7f7;
  --app-grey-300: #f2f2f2;
  --app-grey-400: #ebebeb;
  --app-grey-500: #e0e0e0;
  --app-grey-600: #c7c7c7;
  --app-grey-700: #8f8f8f;
  --app-grey-800: #666666;
  --app-grey-900: #292929;
  --app-grey-950: #1f1f1f;
  --app-grey-1000: #141414;
  --app-grey-1100: #0a0a0a;
  --app-grey-1200: #000000;

  /* Primitive Palette — Dark Alpha */
  --app-alpha-dark-0: #00000000;
  --app-alpha-dark-10: #00000005;
  --app-alpha-dark-20: #0000000a;
  --app-alpha-dark-30: #0000000f;
  --app-alpha-dark-40: #00000014;
  --app-alpha-dark-50: #0000001f;
  --app-alpha-dark-60: #00000038;
  --app-alpha-dark-70: #00000070;
  --app-alpha-dark-80: #00000099;
  --app-alpha-dark-90: #000000d6;
  --app-alpha-dark-100: #000000;

  /* Primitive Palette — Light Alpha */
  --app-alpha-light-0: #ffffff00;
  --app-alpha-light-10: #ffffff05;
  --app-alpha-light-20: #ffffff0a;
  --app-alpha-light-30: #ffffff14;
  --app-alpha-light-40: #ffffff1f;
  --app-alpha-light-50: #ffffff29;
  --app-alpha-light-60: #ffffff47;
  --app-alpha-light-70: #ffffff85;
  --app-alpha-light-80: #ffffffb8;
  --app-alpha-light-90: #ffffffeb;
  --app-alpha-light-100: #ffffff;

  /* Primitive Palette — Red */
  --app-red-100: #fff0f0;
  --app-red-200: #ffe5e5;
  --app-red-300: #fcd7d7;
  --app-red-400: #fab9b9;
  --app-red-500: #f28d8d;
  --app-red-600: #eb5656;
  --app-red-700: #e02d2d;
  --app-red-800: #b22424;
  --app-red-900: #881f1f;
  --app-red-1000: #4c1717;
  --app-red-1100: #391212;
  --app-red-1200: #290b0b;

  /* Primitive Palette — Orange */
  --app-orange-100: #fff2eb;
  --app-orange-200: #ffe9de;
  --app-orange-300: #ffd8c4;
  --app-orange-400: #ffbc99;
  --app-orange-500: #fa935f;
  --app-orange-600: #f96c24;
  --app-orange-700: #de530d;
  --app-orange-800: #b7430a;
  --app-orange-900: #93380b;
  --app-orange-1000: #55230a;
  --app-orange-1100: #3d1805;
  --app-orange-1200: #291003;

  /* Primitive Palette — Yellow */
  --app-yellow-100: #fffbe6;
  --app-yellow-200: #fff6cc;
  --app-yellow-300: #ffea80;
  --app-yellow-400: #ffdc2e;
  --app-yellow-500: #f9b506;
  --app-yellow-600: #dd8c08;
  --app-yellow-700: #b76506;
  --app-yellow-800: #944b08;
  --app-yellow-900: #7a3d0a;
  --app-yellow-1000: #472106;
  --app-yellow-1100: #301704;
  --app-yellow-1200: #241103;

  /* Primitive Palette — Green */
  --app-green-100: #ebfaeb;
  --app-green-200: #d5f6d5;
  --app-green-300: #b2edb2;
  --app-green-400: #7cde7c;
  --app-green-500: #46c846;
  --app-green-600: #25af25;
  --app-green-700: #1b981b;
  --app-green-800: #1a741a;
  --app-green-900: #195d19;
  --app-green-1000: #103710;
  --app-green-1100: #0a290a;
  --app-green-1200: #071f07;

  /* Primitive Palette — Cyan */
  --app-cyan-100: #ebf8fa;
  --app-cyan-200: #d7f5f9;
  --app-cyan-300: #b4ebf3;
  --app-cyan-400: #80dcea;
  --app-cyan-500: #45c3d6;
  --app-cyan-600: #29a4b8;
  --app-cyan-700: #258798;
  --app-cyan-800: #256d7a;
  --app-cyan-900: #235964;
  --app-cyan-1000: #12363f;
  --app-cyan-1100: #0c262c;
  --app-cyan-1200: #071b1f;

  /* Primitive Palette — Blue */
  --app-blue-100: #f0f6ff;
  --app-blue-200: #dfecff;
  --app-blue-300: #c2dcff;
  --app-blue-400: #99c5ff;
  --app-blue-500: #6ba6f5;
  --app-blue-600: #3c86e8;
  --app-blue-700: #1c6edb;
  --app-blue-800: #1a58b2;
  --app-blue-900: #1c478c;
  --app-blue-1000: #162c54;
  --app-blue-1100: #10203d;
  --app-blue-1200: #0b1629;

  /* Primitive Palette — Purple */
  --app-purple-100: #f6f0ff;
  --app-purple-200: #ede2ff;
  --app-purple-300: #dec8ff;
  --app-purple-400: #c8a2ff;
  --app-purple-500: #ad75ff;
  --app-purple-600: #914dff;
  --app-purple-700: #7c35ed;
  --app-purple-800: #6828cc;
  --app-purple-900: #5723a8;
  --app-purple-1000: #38176b;
  --app-purple-1100: #27104a;
  --app-purple-1200: #1a0b30;

  /* Primitive Palette — Pink */
  --app-pink-100: #fdf0f8;
  --app-pink-200: #fce2f2;
  --app-pink-300: #fac6e6;
  --app-pink-400: #f79cd3;
  --app-pink-500: #f067ba;
  --app-pink-600: #e33da0;
  --app-pink-700: #c72885;
  --app-pink-800: #a4236e;
  --app-pink-900: #88215c;
  --app-pink-1000: #531338;
  --app-pink-1100: #3b0d27;
  --app-pink-1200: #2b091d;

  /* Semantic Tokens — Light Mode */
  --app-background-bg-deep: var(--app-grey-300);
  --app-background-bg-base: var(--app-grey-50);
  --app-background-bg-layer-01: var(--app-grey-200);
  --app-background-bg-layer-02: var(--app-grey-300);
  --app-background-bg-inverse: var(--app-grey-950);
  --app-background-bg-button-neutral: var(--app-grey-50);
  --app-background-bg-button-contrast: var(--app-grey-950);

  --app-text-text-primary: var(--app-grey-1000);
  --app-text-text-secondary: var(--app-grey-800);
  --app-text-text-muted: var(--app-grey-700);
  --app-text-text-disabled: var(--app-grey-600);
  --app-text-text-inverse: var(--app-grey-100);
  --app-text-text-button-contrast: var(--app-grey-100);

  --app-icon-icon-primary: var(--app-grey-1000);
  --app-icon-icon-secondary: var(--app-grey-800);
  --app-icon-icon-muted: var(--app-grey-700);
  --app-icon-icon-disabled: var(--app-grey-600);
  --app-icon-icon-inverse: var(--app-grey-100);
  --app-icon-icon-button-contrast: var(--app-grey-100);

  --app-border-border-muted: var(--app-alpha-dark-30);
  --app-border-border-base: var(--app-alpha-dark-40);
  --app-border-border-strong: var(--app-alpha-dark-50);
  --app-border-border-focus: var(--app-grey-1000);
  --app-border-border-inverse: var(--app-grey-1000);

  --app-state-fg-accent: var(--app-blue-700);
  --app-state-bg-accent: var(--app-blue-100);
  --app-state-border-accent: var(--app-blue-400);
  --app-state-fg-success: var(--app-green-700);
  --app-state-bg-success: var(--app-green-100);
  --app-state-border-success: var(--app-green-400);
  --app-state-fg-warning: var(--app-orange-700);
  --app-state-bg-warning: var(--app-orange-100);
  --app-state-border-warning: var(--app-orange-400);
  --app-state-fg-danger: var(--app-red-700);
  --app-state-bg-danger: var(--app-red-100);
  --app-state-border-danger: var(--app-red-400);
  --app-state-fg-attention: var(--app-yellow-600);
  --app-state-bg-attention: var(--app-yellow-100);
  --app-state-border-attention: var(--app-yellow-400);

  --app-overlay-simple-overlay-hover: var(--app-alpha-dark-20);
  --app-overlay-simple-overlay-pressed: var(--app-alpha-dark-30);
  --app-overlay-simple-overlay-disabled: var(--app-alpha-dark-20);
  --app-overlay-simple-overlay-scrim: var(--app-alpha-dark-40);
  --app-overlay-simple-overlay-contrast-hover: var(--app-alpha-light-30);
  --app-overlay-simple-overlay-contrast-pressed: var(--app-alpha-dark-30);

  --app-agent-plan: var(--app-purple-700);
  --app-agent-build: var(--app-blue-700);
  --app-agent-explore: var(--app-cyan-700);
  --app-agent-review: var(--app-green-700);
  --app-agent-writer: var(--app-orange-700);

  --app-avatar-bg-crimson: var(--app-red-200);
  --app-avatar-border-crimson: var(--app-red-500);
  --app-avatar-bg-purple: var(--app-purple-200);
  --app-avatar-border-purple: var(--app-purple-500);
  --app-avatar-bg-orange: var(--app-orange-200);
  --app-avatar-border-orange: var(--app-orange-500);
  --app-avatar-bg-pink: var(--app-pink-200);
  --app-avatar-border-pink: var(--app-pink-500);
  --app-avatar-bg-blue: var(--app-blue-200);
  --app-avatar-border-blue: var(--app-blue-500);
  --app-avatar-bg-green: var(--app-green-200);
  --app-avatar-border-green: var(--app-green-500);

  --app-illustration-illustration-layer-01: var(--app-grey-50);
  --app-illustration-illustration-layer-02: var(--app-grey-400);
  --app-illustration-illustration-layer-03: var(--app-grey-600);

  /* Elevations — Light Mode */
  --app-elevation-elements:
    0px 1px 1px -0.5px rgba(0, 0, 0, 0.04),
    0px 3px 3px -1.5px rgba(0, 0, 0, 0.03);
  --app-elevation-raised:
    0 0 0 0.5px rgba(0, 0, 0, 0.08),
    0 1px 2px -1px rgba(0, 0, 0, 0.04),
    0 2px 4px 0 rgba(0, 0, 0, 0.03);
  --app-elevation-floating:
    0 0 0 0.5px rgba(0, 0, 0, 0.12),
    0 2px 3px -1px rgba(0, 0, 0, 0.04),
    0 4px 8px -2px rgba(0, 0, 0, 0.04),
    0 8px 16px -4px rgba(0, 0, 0, 0.04);
  --app-elevation-overlay:
    0 0 0 0.5px rgba(0, 0, 0, 0.12),
    0 4px 6px -2px rgba(0, 0, 0, 0.03),
    0 12px 24px -4px rgba(0, 0, 0, 0.06),
    0 24px 48px -8px rgba(0, 0, 0, 0.08);
  --app-elevation-button-neutral:
    0 0 0 0.5px var(--app-border-border-base),
    0 1px 1px -0.5px rgba(0, 0, 0, 0.04),
    0 2px 2px -1px rgba(0, 0, 0, 0.04);
  --app-elevation-button-contrast:
    0 0 0 0.5px var(--app-grey-1000),
    0 1px 1px -0.5px rgba(0, 0, 0, 0.16),
    0 2px 2px -1px rgba(0, 0, 0, 0.12),
    inset 0 1px 0.5px 0 rgba(255, 255, 255, 0.16);
  --app-elevation-switch-off:
    0 0.5px 1px 0 rgba(0, 0, 0, 0.08),
    0 0 1px 0 rgba(0, 0, 0, 0.28),
    inset 0 2px 2px 0 rgba(0, 0, 0, 0.04);
  --app-elevation-switch-on:
    0 0.5px 1px 0 rgba(0, 0, 0, 0.08),
    0 0 1px 0 rgba(0, 0, 0, 0.8),
    inset 0 2px 2px 0 rgba(0, 0, 0, 0.1);
}

[data-color-scheme="dark"],
.dark {
  color-scheme: dark;

  --app-background-bg-deep: var(--app-grey-1100);
  --app-background-bg-base: var(--app-grey-1000);
  --app-background-bg-layer-01: var(--app-grey-950);
  --app-background-bg-layer-02: var(--app-grey-900);
  --app-background-bg-inverse: var(--app-grey-100);
  --app-background-bg-button-neutral: var(--app-grey-900);
  --app-background-bg-button-contrast: var(--app-grey-100);

  --app-text-text-primary: var(--app-grey-100);
  --app-text-text-secondary: var(--app-grey-600);
  --app-text-text-muted: var(--app-grey-700);
  --app-text-text-disabled: var(--app-grey-800);
  --app-text-text-inverse: var(--app-grey-1000);
  --app-text-text-button-contrast: var(--app-grey-1000);

  --app-icon-icon-primary: var(--app-grey-100);
  --app-icon-icon-secondary: var(--app-grey-600);
  --app-icon-icon-muted: var(--app-grey-700);
  --app-icon-icon-disabled: var(--app-grey-800);
  --app-icon-icon-inverse: var(--app-grey-1000);
  --app-icon-icon-button-contrast: var(--app-grey-1000);

  --app-border-border-muted: var(--app-alpha-light-20);
  --app-border-border-base: var(--app-alpha-light-30);
  --app-border-border-strong: var(--app-alpha-light-50);
  --app-border-border-focus: var(--app-grey-100);
  --app-border-border-inverse: var(--app-grey-100);

  --app-state-fg-accent: var(--app-blue-500);
  --app-state-bg-accent: var(--app-blue-1100);
  --app-state-border-accent: var(--app-blue-800);
  --app-state-fg-success: var(--app-green-500);
  --app-state-bg-success: var(--app-green-1100);
  --app-state-border-success: var(--app-green-800);
  --app-state-fg-warning: var(--app-orange-500);
  --app-state-bg-warning: var(--app-orange-1100);
  --app-state-border-warning: var(--app-orange-800);
  --app-state-fg-danger: var(--app-red-600);
  --app-state-bg-danger: var(--app-red-1100);
  --app-state-border-danger: var(--app-red-800);
  --app-state-fg-attention: var(--app-yellow-500);
  --app-state-bg-attention: var(--app-yellow-1100);
  --app-state-border-attention: var(--app-yellow-800);

  --app-overlay-simple-overlay-hover: var(--app-alpha-light-20);
  --app-overlay-simple-overlay-pressed: var(--app-alpha-light-30);
  --app-overlay-simple-overlay-disabled: var(--app-alpha-light-10);
  --app-overlay-simple-overlay-scrim: var(--app-alpha-dark-70);
  --app-overlay-simple-overlay-contrast-hover: var(--app-alpha-dark-50);
  --app-overlay-simple-overlay-contrast-pressed: var(--app-alpha-dark-30);

  --app-agent-plan: var(--app-purple-500);
  --app-agent-build: var(--app-blue-500);
  --app-agent-explore: var(--app-cyan-500);
  --app-agent-review: var(--app-green-500);
  --app-agent-writer: var(--app-orange-500);

  --app-avatar-bg-crimson: var(--app-red-1000);
  --app-avatar-border-crimson: var(--app-red-700);
  --app-avatar-bg-purple: var(--app-purple-1000);
  --app-avatar-border-purple: var(--app-purple-700);
  --app-avatar-bg-orange: var(--app-orange-1000);
  --app-avatar-border-orange: var(--app-orange-700);
  --app-avatar-bg-pink: var(--app-pink-1000);
  --app-avatar-border-pink: var(--app-pink-700);
  --app-avatar-bg-blue: var(--app-blue-1000);
  --app-avatar-border-blue: var(--app-blue-700);
  --app-avatar-bg-green: var(--app-green-1000);
  --app-avatar-border-green: var(--app-green-700);

  --app-illustration-illustration-layer-01: var(--app-grey-900);
  --app-illustration-illustration-layer-02: var(--app-grey-800);
  --app-illustration-illustration-layer-03: var(--app-grey-700);

  --app-elevation-elements:
    0px 1px 1px -0.5px rgba(0, 0, 0, 0.24),
    0px 3px 3px -1.5px rgba(0, 0, 0, 0.16);
  --app-elevation-raised:
    0 0 0 0.5px var(--app-border-border-base),
    0 1px 2px -1px rgba(0, 0, 0, 0.32),
    0 2px 4px 0 rgba(0, 0, 0, 0.24);
  --app-elevation-floating:
    0 0 0 0.5px var(--app-border-border-base),
    0 2px 3px -1px rgba(0, 0, 0, 0.32),
    0 4px 8px -2px rgba(0, 0, 0, 0.32),
    0 8px 16px -4px rgba(0, 0, 0, 0.32);
  --app-elevation-overlay:
    0 0 0 0.5px var(--app-border-border-base),
    0 4px 6px -2px rgba(0, 0, 0, 0.24),
    0 12px 24px -4px rgba(0, 0, 0, 0.48),
    0 24px 48px -8px rgba(0, 0, 0, 0.64);
  --app-elevation-button-neutral:
    0 0 0 0.5px var(--app-border-border-base),
    0 1px 1px -0.5px rgba(0, 0, 0, 0.32),
    0 2px 2px -1px rgba(0, 0, 0, 0.24),
    inset 0 0.5px 0.5px 0 rgba(255, 255, 255, 0.08);
  --app-elevation-button-contrast:
    0 0 0 0.5px var(--app-grey-100),
    0 1px 1px -0.5px rgba(0, 0, 0, 0.48),
    0 2px 2px -1px rgba(0, 0, 0, 0.32),
    inset 0 1px 0.5px 0 rgba(255, 255, 255, 0.4);
  --app-elevation-switch-off:
    0 0.5px 1px 0 rgba(255, 255, 255, 0.14),
    0 0 1px 0 rgba(0, 0, 0, 0.28),
    inset 0 2px 2px 0 rgba(0, 0, 0, 0.16);
  --app-elevation-switch-on:
    0 0.5px 1px 0 rgba(255, 255, 255, 0.14),
    0 0 1px 0 rgba(0, 0, 0, 0.28),
    inset 0 2px 2px 0 rgba(255, 255, 255, 0.12);
}

/* ============================================================================
 * Base Document Reset
 * ========================================================================== */

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

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1.25;
  font-weight: 440;
  letter-spacing: -0.04px;
  font-variant-numeric: tabular-nums;
  background: var(--app-background-bg-deep);
  color: var(--app-text-text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

code, pre, kbd, .mono {
  font-family: var(--font-mono);
}

/* ============================================================================
 * 1. Application Frame, Top Chrome, Tab Nav & Page Shells
 * ========================================================================== */

.app-viewport-frame {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  overflow: hidden;
  background: var(--app-background-bg-deep);
  padding: 0 8px 8px;
}

.app-header-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  flex-shrink: 0;
  padding: 8px 0;
}

.app-header-bar__inner {
  display: flex;
  align-items: center;
  height: 28px;
  width: 100%;
  gap: 4px;
  padding: 0 8px;
}

.app-header-bar__sep {
  width: 1px;
  height: 12px;
  margin: 0 4px;
  background: var(--app-border-border-strong);
  flex-shrink: 0;
}

.app-header-bar__right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
}

.app-main-canvas {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  min-width: 0;
  width: 100%;
  overflow: hidden;
  border-radius: 10px;
  background: var(--app-background-bg-base);
  box-shadow: var(--app-elevation-raised);
}

/* Horizontal Tab Bar */
[data-tab-nav] {
  position: relative;
  flex-shrink: 0;
  background: var(--app-background-bg-base);
  padding: 0 24px;
}

[data-tab-nav]::after {
  content: "";
  pointer-events: none;
  position: absolute;
  inset: auto 0 0 0;
  height: 0.5px;
  background: var(--app-border-border-strong);
}

.app-tab-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
  gap: 16px;
}

.app-tab-nav__list {
  position: relative;
  display: flex;
  align-items: center;
  height: 100%;
  flex: 1;
  min-width: 0;
  margin: 0 -10px;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
}

.app-tab-nav__list::-webkit-scrollbar {
  display: none;
}

.app-tab-nav__indicator {
  pointer-events: none;
  position: absolute;
  bottom: 0;
  left: 0;
  z-index: 10;
  height: 1px;
  background: var(--app-border-border-inverse);
  transition: transform 220ms cubic-bezier(0.77, 0, 0.175, 1), width 220ms cubic-bezier(0.77, 0, 0.175, 1);
}

/* Scroll View & Page Shells */
.scroll-view {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
}

[data-page-shell="wide"] {
  width: min(calc(100% - 64px), 960px);
  margin: 0 auto;
  padding-bottom: 32px;
}

[data-page-shell="extra-wide"] {
  width: min(calc(100% - 64px), 1520px);
  margin: 0 auto;
  padding-bottom: 32px;
}

[data-page-shell="narrow"] {
  max-width: 512px;
  margin: 0 auto;
  padding: 0 24px 32px;
}

/* Settings 3-Column Layout */
[data-settings-layout] {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(0, 704px) minmax(0, 1fr);
  align-items: start;
  gap: 24px;
  padding-top: 64px;
}

.settings-nav {
  display: flex;
  flex-direction: column;
  width: 176px;
  gap: 4px;
}

.settings-nav__item {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 6px;
  gap: 8px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 440;
  color: var(--app-text-text-muted);
  transition: background-color 120ms ease, color 120ms ease;
}

.settings-nav__item:hover {
  background: var(--app-overlay-simple-overlay-hover);
  color: var(--app-text-text-primary);
}

.settings-nav__item[data-active="true"] {
  background: var(--app-overlay-simple-overlay-pressed);
  color: var(--app-text-text-primary);
  font-weight: 530;
}

/* Two-Column Activity & Controls Layout */
.activity-dashboard {
  display: grid;
  grid-template-columns: minmax(0, 960px) 352px;
  gap: 56px;
  max-width: 1368px;
  margin: 0 auto;
  padding: 32px 0 64px;
}

/* ============================================================================
 * 2. Buttons ([data-component="button"] & [data-component="icon-button"])
 * ========================================================================== */

[data-component="button"] {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 28px;
  padding: 0 11px;
  border: none;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 16px;
  font-weight: 530;
  letter-spacing: -0.04px;
  white-space: nowrap;
  user-select: none;
  cursor: pointer;
  background: var(--app-background-bg-button-neutral);
  color: var(--app-text-text-primary);
  box-shadow: var(--app-elevation-button-neutral);
}

[data-component="button"]::after,
[data-component="icon-button"]::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: transparent;
}

[data-component="button"][data-size="small"] {
  height: 24px;
  padding: 0 9px;
  border-radius: 4px;
}

[data-component="button"][data-size="large"] {
  height: 32px;
  padding: 0 15px;
  border-radius: 6px;
}

[data-component="button"][data-variant="contrast"] {
  background: linear-gradient(180deg, var(--app-alpha-light-20) 0%, var(--app-alpha-light-0) 100%), var(--app-background-bg-button-contrast);
  color: var(--app-text-text-button-contrast);
  text-shadow: 0 0.5px 1px rgba(0, 0, 0, 0.12);
  box-shadow: var(--app-elevation-button-contrast);
}

[data-component="button"][data-variant="outline"] {
  background: transparent;
  color: var(--app-text-text-primary);
  box-shadow: inset 0 0 0 1px var(--app-border-border-muted);
}

[data-component="button"][data-variant="ghost"] {
  background: transparent;
  color: var(--app-text-text-primary);
  box-shadow: none;
}

[data-component="button"][data-variant="ghost-muted"] {
  background: transparent;
  color: var(--app-text-text-muted);
  box-shadow: none;
}

[data-component="button"][data-variant="danger"] {
  background: var(--app-background-bg-button-neutral);
  color: var(--app-state-fg-danger);
  box-shadow: var(--app-elevation-button-neutral);
}

[data-component="button"][data-variant="warning"] {
  background: var(--app-background-bg-button-neutral);
  color: var(--app-state-fg-warning);
  box-shadow: var(--app-elevation-button-neutral);
}

[data-component="button"]:hover:not(:disabled):not([data-disabled])::after,
[data-component="icon-button"]:hover:not(:disabled):not([data-disabled])::after {
  background: var(--app-overlay-simple-overlay-hover);
}

[data-component="button"][data-variant="ghost-muted"]:hover:not(:disabled):not([data-disabled]) {
  color: var(--app-text-text-primary);
}

[data-component="button"][data-variant="contrast"]:hover:not(:disabled):not([data-disabled])::after {
  background: var(--app-overlay-simple-overlay-contrast-hover);
}

[data-component="button"]:active:not(:disabled):not([data-disabled])::after,
[data-component="icon-button"]:active:not(:disabled):not([data-disabled])::after {
  background: var(--app-overlay-simple-overlay-pressed);
}

[data-component="button"]:focus-visible,
[data-component="icon-button"]:focus-visible {
  outline: none;
  box-shadow: 0 0 0 1px var(--app-border-border-focus);
}

[data-component="button"]:disabled,
[data-component="button"][data-disabled],
[data-component="icon-button"]:disabled,
[data-component="icon-button"][data-disabled] {
  background: var(--app-overlay-simple-overlay-disabled);
  color: var(--app-text-text-disabled);
  box-shadow: none;
  cursor: not-allowed;
}

[data-component="icon-button"] {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  background: var(--app-background-bg-button-neutral);
  color: var(--app-icon-icon-primary);
  box-shadow: var(--app-elevation-button-neutral);
}

[data-component="icon-button"][data-size="small"] {
  width: 20px;
  height: 20px;
  border-radius: 4px;
}

[data-component="icon-button"][data-size="large"] {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

[data-component="icon-button"][data-variant="ghost"] {
  background: transparent;
  box-shadow: none;
}

[data-component="icon-button"][data-variant="ghost-muted"] {
  background: transparent;
  color: var(--app-icon-icon-muted);
  box-shadow: none;
}

[data-component="icon-button"][data-variant="ghost-muted"]:hover:not(:disabled) {
  color: var(--app-icon-icon-primary);
}

/* ============================================================================
 * 3. Form Controls (Inputs, Selects, Switches, Segmented Control)
 * ========================================================================== */

[data-component="field"] {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

[data-slot="field-label"] {
  font-size: 13px;
  line-height: 16px;
  font-weight: 530;
  color: var(--app-text-text-primary);
}

[data-slot="field-description"] {
  font-size: 12px;
  line-height: 16px;
  color: var(--app-text-text-secondary);
}

[data-slot="field-error"] {
  font-size: 12px;
  line-height: 16px;
  color: var(--app-state-fg-danger);
}

[data-component="text-input"] [data-slot="text-input-shell"],
.text-input-shell {
  display: flex;
  align-items: center;
  height: 28px;
  padding: 0 6px 0 8px;
  gap: 6px;
  border-radius: 6px;
  border: 1px solid transparent;
  background: linear-gradient(180deg, var(--app-alpha-light-20) 0%, var(--app-alpha-light-0) 100%), var(--app-background-bg-base);
  box-shadow: var(--app-elevation-button-neutral);
}

[data-component="text-input"][data-size="large"] [data-slot="text-input-shell"] {
  height: 32px;
}

[data-component="text-input"] [data-slot="text-input-shell"]:hover {
  background: var(--app-background-bg-base);
}

[data-component="text-input"] [data-slot="text-input-shell"]:focus-within,
.text-input-shell:focus-within {
  border-color: var(--app-border-border-focus);
  box-shadow: none;
  background: var(--app-background-bg-base);
}

[data-component="text-input"] input,
.text-input-shell input {
  flex: 1;
  min-width: 0;
  border: none;
  outline: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 16px;
  font-weight: 440;
  color: var(--app-text-text-primary);
}

[data-component="text-input"] input::placeholder,
.text-input-shell input::placeholder {
  color: var(--app-text-text-muted);
}

/* Select Trigger */
[data-component="select"] {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  height: 28px;
  padding: 0 8px;
  gap: 6px;
  border: none;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 16px;
  font-weight: 530;
  cursor: pointer;
  background: var(--app-background-bg-button-neutral);
  color: var(--app-text-text-primary);
  box-shadow: var(--app-elevation-button-neutral);
}

[data-component="select"][data-appearance="inline"] {
  height: 28px;
  padding: 0 8px 0 6px;
  background: transparent;
  box-shadow: none;
}

[data-component="select"][data-appearance="inline"]:hover {
  background: var(--app-overlay-simple-overlay-hover);
}

[data-slot="select-trigger-value"] {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

[data-slot="select-trigger-icon"] {
  display: inline-flex;
  align-items: center;
  color: var(--app-icon-icon-secondary);
}

/* Switch */
[data-component="switch"] {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

[data-component="switch"] [data-slot="switch-control"] {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 24px;
  height: 16px;
  padding: 2px;
  border-radius: 4px;
  border: 0.5px solid var(--app-border-border-base);
  background: var(--app-background-bg-layer-02);
  box-shadow: var(--app-elevation-switch-off);
  transition: background-color 150ms cubic-bezier(0.22, 1, 0.36, 1), border-color 150ms cubic-bezier(0.22, 1, 0.36, 1);
}

[data-component="switch"][data-checked] [data-slot="switch-control"] {
  background: var(--app-background-bg-inverse);
  border-color: var(--app-border-border-strong);
  box-shadow: var(--app-elevation-switch-on);
}

[data-component="switch"] [data-slot="switch-thumb"] {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: var(--app-background-bg-base);
  transition: transform 150ms cubic-bezier(0.22, 1, 0.36, 1), width 150ms cubic-bezier(0.22, 1, 0.36, 1);
}

[data-component="switch"][data-checked] [data-slot="switch-thumb"] {
  transform: translateX(8px);
}

/* Segmented Control */
[data-component="segmented-control"] {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 2px;
  border-radius: 6px;
  background: var(--app-background-bg-layer-01);
  box-shadow: inset 0 0 0 0.5px var(--app-border-border-muted);
}

[data-slot="segmented-control-item"] {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 24px;
  padding: 0 8px;
  border: none;
  border-radius: 4px;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 16px;
  font-weight: 530;
  color: var(--app-text-text-muted);
  cursor: pointer;
}

[data-slot="segmented-control-item"][data-selected="true"] {
  background: var(--app-background-bg-base);
  color: var(--app-text-text-primary);
  border: 0.5px solid var(--app-border-border-strong);
  box-shadow: var(--app-elevation-elements);
}

/* ============================================================================
 * 4. Billing Trigger, Avatars & Tags
 * ========================================================================== */

.billing-trigger {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 8px 0 6px;
  gap: 6px;
  border-radius: 6px;
  border: 0.5px solid var(--app-border-border-base);
  background: var(--app-background-bg-layer-01);
  box-shadow: var(--app-elevation-elements);
  font-family: var(--font-sans);
  font-size: 12px;
  line-height: 16px;
  font-weight: 530;
  color: var(--app-text-text-primary);
  cursor: pointer;
}

.billing-trigger:hover {
  background: var(--app-background-bg-layer-02);
}

.billing-battery {
  display: inline-flex;
  align-items: center;
  width: 16px;
  height: 11px;
}

.billing-battery__body {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  width: 14px;
  height: 10px;
  padding: 1.5px;
  border-radius: 2.5px;
  border: 1px solid var(--app-border-border-strong);
}

.billing-battery__bar {
  border-radius: 0.5px;
  background: var(--app-border-border-muted);
}

.billing-battery__bar[data-filled="true"] {
  background: var(--app-state-fg-success);
}

[data-component="avatar"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 530;
  flex-shrink: 0;
  background: var(--app-avatar-bg-blue);
  color: var(--app-text-text-primary);
  box-shadow: inset 0 0 0 0.5px var(--app-avatar-border-blue);
}

[data-component="avatar"][data-size="small"] {
  width: 16px;
  height: 16px;
  font-size: 10px;
}

[data-component="avatar"][data-size="large"] {
  width: 28px;
  height: 28px;
  font-size: 13px;
}

[data-component="avatar"][data-kind="org"] {
  border-radius: 4px;
}

[data-component="avatar"][data-kind="org"][data-size="large"] {
  border-radius: 6px;
}

[data-component="tag"] {
  display: inline-flex;
  align-items: center;
  height: 16px;
  padding: 0 4px;
  border-radius: 2px;
  border: 0.5px solid var(--app-border-border-base);
  background: var(--app-background-bg-layer-02);
  font-size: 11px;
  line-height: 16px;
  font-weight: 530;
  color: var(--app-text-text-secondary);
}

[data-component="tag"][data-tone="success"] {
  background: var(--app-state-bg-success);
  border-color: var(--app-state-border-success);
  color: var(--app-state-fg-success);
}

[data-component="tag"][data-tone="warning"] {
  background: var(--app-state-bg-warning);
  border-color: var(--app-state-border-warning);
  color: var(--app-state-fg-warning);
}

[data-component="tag"][data-tone="danger"] {
  background: var(--app-state-bg-danger);
  border-color: var(--app-state-border-danger);
  color: var(--app-state-fg-danger);
}

/* ============================================================================
 * 5. Recessed-Tray DataTable & Cards
 * ========================================================================== */

.data-table-tray {
  overflow: hidden;
  border-radius: 6px;
  padding: 2px;
  background: var(--app-background-bg-layer-01);
  box-shadow: inset 0 0 0 0.5px var(--app-border-border-muted);
}

.data-table-tray__scroll {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  text-align: left;
  font-size: 13px;
}

.data-table thead tr {
  height: 32px;
  font-size: 12px;
  font-weight: 530;
  color: var(--app-text-text-secondary);
}

.data-table th {
  padding: 0 12px;
  font-weight: 530;
  white-space: nowrap;
}

.data-table tbody {
  background: var(--app-background-bg-base);
  border-radius: 4px;
  box-shadow: var(--app-elevation-raised);
}

.data-table tbody tr {
  height: 48px;
  transition: background-color 120ms ease;
}

.data-table tbody tr:hover:not(.data-table__pagination-row) {
  background: var(--app-overlay-simple-overlay-hover);
}

.data-table td {
  padding: 0 12px;
  border-bottom: 1px solid var(--app-border-border-muted);
  vertical-align: middle;
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table__pagination-row {
  height: 48px;
  font-size: 12px;
  color: var(--app-text-text-secondary);
}

/* Cards */
.app-card {
  border-radius: 8px;
  border: 1px solid var(--app-border-border-base);
  background: var(--app-background-bg-base);
}

.app-card--divided {
  padding: 0 20px;
}

.app-card__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--app-border-border-muted);
}

.app-card__row:last-child {
  border-bottom: none;
}

.activity-card {
  border-radius: 8px;
  background: var(--app-background-bg-base);
  box-shadow: var(--app-elevation-raised);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.activity-card__label {
  font-size: 12px;
  line-height: 16px;
  color: var(--app-text-text-secondary);
}

.activity-card__value {
  font-size: 24px;
  line-height: 28px;
  font-weight: 530;
  letter-spacing: -0.48px;
  color: var(--app-text-text-primary);
}

/* ============================================================================
 * 6. Modals ([data-component="dialog"]) & Side Drawers ([data-component="app-drawer"])
 * ========================================================================== */

[data-component="dialog-overlay"] {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--app-overlay-simple-overlay-scrim);
}

[data-component="dialog"] {
  position: fixed;
  top: 45%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1001;
  width: min(calc(100vw - 32px), 480px);
  border-radius: 6px;
  background: var(--app-background-bg-layer-01);
  box-shadow: var(--app-elevation-overlay);
  display: flex;
  flex-direction: column;
}

[data-slot="dialog-header"] {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  gap: 12px;
}

[data-slot="dialog-title"] {
  margin: 0;
  font-size: 15px;
  line-height: 20px;
  font-weight: 530;
  color: var(--app-text-text-primary);
}

[data-slot="dialog-body"] {
  padding: 0 16px 16px;
  color: var(--app-text-text-secondary);
  font-size: 13px;
  line-height: 20px;
}

[data-slot="dialog-footer"] {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding: 16px;
  border-top: 0.5px solid var(--app-border-border-muted);
}

[data-component="app-drawer"] {
  position: fixed;
  inset: 8px 8px 8px auto;
  z-index: 60;
  width: min(var(--side-drawer-width, 440px), calc(100vw - 16px));
  height: calc(100dvh - 16px);
  border-radius: 12px;
  background: var(--app-background-bg-base);
  box-shadow: var(--app-elevation-overlay);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Dropdown Menus ([data-component="menu-content"]) */
[data-component="menu-content"] {
  padding: 2px;
  border-radius: 6px;
  background: var(--app-background-bg-layer-01);
  box-shadow: var(--app-elevation-floating);
  display: flex;
  flex-direction: column;
}

[data-component="menu-item"] {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 28px;
  padding: 0 12px;
  gap: 8px;
  border: none;
  border-radius: 4px;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 16px;
  font-weight: 530;
  color: var(--app-text-text-primary);
  cursor: pointer;
  text-align: left;
  width: 100%;
}

[data-component="menu-item"]:hover,
[data-component="menu-item"][data-highlighted] {
  background: var(--app-overlay-simple-overlay-hover);
}

[data-component="menu-item"][data-variant="danger"] {
  color: var(--app-state-fg-danger);
}

.menu-separator {
  height: 0.5px;
  margin: 2px -2px;
  background: var(--app-border-border-muted);
}

/* Authentication Shell (Login / Sign Up / SSO) */
.auth-shell {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  gap: 32px;
  padding: 24px;
  background: var(--app-background-bg-deep);
}

.auth-shell__column {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 320px;
  gap: 24px;
}

.auth-shell__title {
  margin: 0;
  text-align: center;
  font-size: 15px;
  line-height: 20px;
  font-weight: 530;
  letter-spacing: -0.15px;
  color: var(--app-text-text-primary);
}

.auth-shell__divider {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  line-height: 16px;
  color: var(--app-text-text-muted);
}

.auth-shell__divider::before,
.auth-shell__divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--app-border-border-muted);
}

/* ============================================================================
 * 7. Accessibility, Localization, Skeletons & Responsive Adaptations
 * ========================================================================== */

/* Skip to main content link */
.skip-link {
  position: fixed;
  top: 8px;
  inset-inline-start: 8px;
  z-index: 2000;
  padding: 6px 12px;
  border-radius: 6px;
  background: var(--app-background-bg-inverse);
  color: var(--app-text-text-inverse);
  font-size: 13px;
  font-weight: 530;
  box-shadow: var(--app-elevation-floating);
  transform: translateY(-150%);
  transition: transform 120ms ease;
}

.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--app-border-border-focus);
  outline-offset: 2px;
}

/* Skeleton Loader (CLS = 0) */
.app-skeleton {
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  background: var(--app-background-bg-layer-02);
}

.app-skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--app-overlay-simple-overlay-hover) 50%,
    transparent 100%
  );
  animation: app-shimmer 1400ms ease-in-out infinite;
}

@keyframes app-shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* Multi-Script & CJK Typography Reset */
:lang(ja), :lang(zh), :lang(ko), :lang(ar), :lang(he), :lang(th) {
  letter-spacing: 0 !important;
  line-height: 1.45;
}

/* Directional Icon Flipping in RTL */
[dir="rtl"] .icon-directional {
  transform: scaleX(-1);
}

/* Tablet & Single-Column Breakpoint (< 1100px) */
@media (max-width: 1100px) {
  .activity-dashboard,
  [data-settings-layout] {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 24px;
  }

  .settings-nav {
    flex-direction: row;
    width: 100%;
    overflow-x: auto;
    padding-bottom: 4px;
  }
}

/* Mobile & Small Tablet Breakpoint (< 768px) */
@media (max-width: 768px) {
  .app-viewport-frame {
    padding: 0 4px max(4px, env(safe-area-inset-bottom));
  }
  .app-header-bar {
    padding: 4px 0;
  }
  [data-tab-nav] {
    padding: 0 16px;
  }
  [data-page-shell="wide"],
  [data-page-shell="extra-wide"] {
    width: min(calc(100% - 32px), 960px);
  }
}

/* Mobile Portrait Bottom-Sheet Adaptation (< 640px) */
@media (max-width: 640px) {
  [data-component="dialog"] {
    top: auto;
    left: 4px;
    right: 4px;
    bottom: max(4px, env(safe-area-inset-bottom));
    width: auto;
    max-height: calc(100dvh - 24px);
    transform: none;
    border-radius: 12px;
  }

  [data-component="app-drawer"] {
    inset: auto 4px max(4px, env(safe-area-inset-bottom)) 4px;
    width: auto;
    height: auto;
    max-height: calc(100dvh - 24px);
    border-radius: 12px;
  }
}

/* Touch Device / Coarse Pointer Adaptation */
@media (pointer: coarse) {
  [data-component="button"],
  [data-component="select"],
  [data-component="menu-item"],
  .settings-nav__item {
    min-height: 36px;
  }

  [data-component="icon-button"] {
    min-width: 32px;
    min-height: 32px;
  }

  /* Prevent iOS Safari auto-zoom on input focus */
  [data-component="text-input"] input,
  .text-input-shell input,
  textarea,
  select {
    font-size: 16px;
  }
}

/* Reduced Motion Preference */
@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;
  }
}

/* Windows High Contrast / Forced Colors Mode */
@media (forced-colors: active) {
  [data-component="button"],
  [data-component="icon-button"],
  [data-component="select"],
  [data-component="text-input"] [data-slot="text-input-shell"],
  .app-card,
  .data-table-tray {
    border: 1px solid ButtonText;
  }

  [data-component="button"]:focus-visible,
  [data-component="icon-button"]:focus-visible,
  [data-component="select"]:focus-visible {
    outline: 2px solid Highlight;
    outline-offset: 2px;
  }
}

/* ==========================================================================
   Universal Legal & Privacy Footer (.app-footer)
   ========================================================================== */
.app-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  border-top: 0.5px solid var(--app-border-border-muted);
  font-size: 11px;
  line-height: 16px;
  color: var(--app-text-text-muted);
}

.app-footer__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.app-footer__links a {
  color: var(--app-text-text-secondary);
  text-decoration: none;
  transition: color 100ms ease;
}

.app-footer__links a:hover {
  color: var(--app-text-text-primary);
  text-decoration: underline;
}

.app-footer__meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.app-footer__gpc-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--app-text-text-secondary);
  font-size: 11px;
}

.app-footer__gpc-dot {
  color: #10b981;
  font-size: 8px;
}