/* ============================================================================
 * Maiya Official Website Stylesheet (Extracted from HeroUI v3)
 * Theme: Mint | Glassmorphism: Enabled by Default | Mode: System / Light / Dark
 * ============================================================================ */

@layer theme, base, components, utilities;

/* ============================================================================
 * 1. THEME LAYER — Mint Theme Tokens, Light/Dark Modes & Glassmorphism
 * ============================================================================ */
@layer theme {
  :root,
  :host {
    /* Primitive Colors */
    --white: oklch(100% 0 0);
    --black: oklch(0% 0 0);
    --snow: oklch(99.11% 0 0);
    --eclipse: oklch(21.03% 0.0059 285.89);

    /* System-Native Typography (Zero External Font Requests) */
    --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "HarmonyOS Sans SC", "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

    /* Spacing & Sizing */
    --spacing: 0.25rem;
    --border-width: 1px;
    --disabled-opacity: 0.5;
    --ring-offset-width: 2px;

    /* Cursors */
    --cursor-interactive: pointer;
    --cursor-disabled: not-allowed;

    /* Radius Scale */
    --radius: 0.5rem;
    --field-radius: calc(var(--radius) * 1.5);
    --radius-xs: calc(var(--radius) * 0.25);
    --radius-sm: calc(var(--radius) * 0.5);
    --radius-md: calc(var(--radius) * 0.75);
    --radius-lg: calc(var(--radius) * 1);
    --radius-xl: calc(var(--radius) * 1.5);
    --radius-2xl: calc(var(--radius) * 2);
    --radius-3xl: calc(var(--radius) * 3);
    --radius-4xl: calc(var(--radius) * 4);

    /* Motion Curves */
    --ease-smooth: ease;
    --ease-out: cubic-bezier(0.215, 0.61, 0.355, 1);
    --ease-out-fluid: cubic-bezier(0.32, 0.72, 0, 1);
    --ease-in-out: cubic-bezier(0.645, 0.045, 0.355, 1);

    /* Z-Index */
    --z-overlay: 1000;
    --z-modal: 1100;
    --z-toast: 1200;
    --z-tooltip: 1300;
  }

  /* --------------------------------------------------------------------------
   * Mint Light Mode (Default Light)
   * -------------------------------------------------------------------------- */
  :root,
  .light,
  [data-theme="light"],
  [data-design-theme="mint"]:not(.dark):not([data-theme="dark"]) {
    color-scheme: light;

    --background: oklch(97.02% 0.015 154.48);
    --foreground: oklch(21.03% 0.015 154.48);

    --surface: oklch(100% 0.0075 154.48);
    --surface-foreground: oklch(21.03% 0.015 154.48);
    --surface-secondary: oklch(95.24% 0.0225 154.48);
    --surface-secondary-foreground: oklch(21.03% 0.015 154.48);
    --surface-tertiary: oklch(93.73% 0.0225 154.48);
    --surface-tertiary-foreground: oklch(21.03% 0.015 154.48);

    --overlay: oklch(100% 0.0045 154.48);
    --overlay-foreground: oklch(21.03% 0.015 154.48);

    --muted: oklch(55.17% 0.03 154.48);

    --default: oklch(94% 0.015 154.48);
    --default-foreground: oklch(21.03% 0.0059 154.48);

    --field-background: oklch(100% 0.0075 154.48);
    --field-border: oklch(90% 0.015 154.48);
    --field-foreground: oklch(21.03% 0.015 154.48);
    --field-placeholder: oklch(55.17% 0.03 154.48);

    --accent: oklch(87.12% 0.1363 154.48);
    --accent-foreground: oklch(15% 0.0273 154.48);
    --focus: oklch(87.12% 0.1363 154.48);

    --success: oklch(73.29% 0.1992 138.91);
    --success-foreground: oklch(21.03% 0.0059 138.91);

    --warning: oklch(78.19% 0.1631 60.4);
    --warning-foreground: oklch(21.03% 0.0059 60.4);

    --danger: oklch(65.32% 0.2398 13.81);
    --danger-foreground: oklch(99.11% 0 0);

    --segment: oklch(100% 0.015 154.48);
    --segment-foreground: oklch(21.03% 0.015 154.48);

    --border: oklch(90% 0.015 154.48);
    --separator: oklch(92% 0.015 154.48);
    --link: oklch(21.03% 0.015 154.48);
    --backdrop: rgba(0, 0, 0, 0.5);

    --scrollbar-thumb: color-mix(in oklch, var(--foreground) 15%, transparent);
    --scrollbar-track: transparent;

    --surface-shadow:
      0 2px 4px 0 rgba(0, 0, 0, 0.04),
      0 1px 2px 0 rgba(0, 0, 0, 0.06),
      0 0 1px 0 rgba(0, 0, 0, 0.06);
    --overlay-shadow:
      0 2px 8px 0 rgba(0, 0, 0, 0.06),
      0 -6px 12px 0 rgba(0, 0, 0, 0.03),
      0 14px 28px 0 rgba(0, 0, 0, 0.08);
    --field-shadow:
      0 2px 4px 0 rgba(0, 0, 0, 0.04),
      0 1px 2px 0 rgba(0, 0, 0, 0.06),
      0 0 1px 0 rgba(0, 0, 0, 0.06);
  }

  /* --------------------------------------------------------------------------
   * Mint Dark Mode
   * -------------------------------------------------------------------------- */
  .dark,
  [data-theme="dark"],
  [data-design-theme="mint"].dark,
  [data-design-theme="mint"][data-theme="dark"] {
    color-scheme: dark;

    --background: oklch(12% 0.015 154.48);
    --foreground: oklch(99.11% 0.015 154.48);

    --surface: oklch(21.03% 0.03 154.48);
    --surface-foreground: oklch(99.11% 0.015 154.48);
    --surface-secondary: oklch(25.7% 0.0225 154.48);
    --surface-secondary-foreground: oklch(99.11% 0.015 154.48);
    --surface-tertiary: oklch(27.21% 0.0225 154.48);
    --surface-tertiary-foreground: oklch(99.11% 0.015 154.48);

    --overlay: oklch(21.03% 0.03 154.48);
    --overlay-foreground: oklch(99.11% 0.015 154.48);

    --muted: oklch(70.5% 0.03 154.48);

    --default: oklch(27.4% 0.015 154.48);
    --default-foreground: oklch(99.11% 0 0);

    --field-background: oklch(21.03% 0.03 154.48);
    --field-border: oklch(28% 0.015 154.48);
    --field-foreground: oklch(99.11% 0.015 154.48);
    --field-placeholder: oklch(70.5% 0.03 154.48);

    --accent: oklch(87.12% 0.1363 154.48);
    --accent-foreground: oklch(15% 0.0273 154.48);
    --focus: oklch(87.12% 0.1363 154.48);

    --success: oklch(73.29% 0.1992 138.91);
    --success-foreground: oklch(21.03% 0.0059 138.91);

    --warning: oklch(78.19% 0.1631 60.4);
    --warning-foreground: oklch(21.03% 0.0059 60.4);

    --danger: oklch(65.32% 0.2398 13.81);
    --danger-foreground: oklch(99.11% 0 0);

    --segment: oklch(39.64% 0.015 154.48);
    --segment-foreground: oklch(99.11% 0.015 154.48);

    --border: oklch(28% 0.015 154.48);
    --separator: oklch(25% 0.015 154.48);
    --link: oklch(99.11% 0.015 154.48);
    --backdrop: rgba(0, 0, 0, 0.65);

    --scrollbar-thumb: color-mix(in oklch, var(--foreground) 18%, transparent);
    --scrollbar-track: transparent;

    --surface-shadow: 0 0 0 1px color-mix(in oklab, var(--border) 60%, transparent);
    --overlay-shadow:
      0 0 1px 0 rgba(255, 255, 255, 0.22) inset,
      0 16px 36px -4px rgba(0, 0, 0, 0.55);
    --field-shadow: 0 0 0 1px color-mix(in oklab, var(--border) 65%, transparent);
  }

  /* --------------------------------------------------------------------------
   * Calculated Semantic Tokens (Dynamic via color-mix in oklab)
   * -------------------------------------------------------------------------- */
  :root,
  .light,
  .dark,
  [data-theme="light"],
  [data-theme="dark"],
  [data-design-theme] {
    --surface-hover: color-mix(in oklab, var(--surface) 92%, var(--surface-foreground) 8%);
    --background-secondary: color-mix(in oklab, var(--background) 96%, var(--foreground) 4%);
    --background-tertiary: color-mix(in oklab, var(--background) 92%, var(--foreground) 8%);

    --default-hover: color-mix(in oklab, var(--default) 93%, var(--default-foreground) 7%);
    --accent-hover: color-mix(in oklab, var(--accent) 90%, var(--accent-foreground) 10%);
    --success-hover: color-mix(in oklab, var(--success) 90%, var(--success-foreground) 10%);
    --warning-hover: color-mix(in oklab, var(--warning) 90%, var(--warning-foreground) 10%);
    --danger-hover: color-mix(in oklab, var(--danger) 90%, var(--danger-foreground) 10%);

    --default-soft: color-mix(in oklab, var(--default) 55%, transparent);
    --default-soft-foreground: var(--default-foreground);
    --default-soft-hover: color-mix(in oklab, var(--default) 70%, transparent);

    --accent-soft: color-mix(in oklab, var(--accent) 18%, transparent);
    --accent-soft-foreground: color-mix(in oklab, var(--accent) 68%, var(--foreground) 32%);
    --accent-soft-hover: color-mix(in oklab, var(--accent) 26%, transparent);

    --success-soft: color-mix(in oklab, var(--success) 15%, transparent);
    --success-soft-foreground: color-mix(in oklab, var(--success) 75%, var(--foreground) 25%);
    --success-soft-hover: color-mix(in oklab, var(--success) 22%, transparent);

    --warning-soft: color-mix(in oklab, var(--warning) 15%, transparent);
    --warning-soft-foreground: color-mix(in oklab, var(--warning) 75%, var(--foreground) 25%);
    --warning-soft-hover: color-mix(in oklab, var(--warning) 22%, transparent);

    --danger-soft: color-mix(in oklab, var(--danger) 15%, transparent);
    --danger-soft-foreground: color-mix(in oklab, var(--danger) 75%, var(--foreground) 25%);
    --danger-soft-hover: color-mix(in oklab, var(--danger) 22%, transparent);
  }

  /* --------------------------------------------------------------------------
   * Glassmorphism Mode (Global `[data-glass="true"]` OR `.glass`)
   * -------------------------------------------------------------------------- */
  :root:not(.dark):not([data-theme="dark"]) :is([data-glass="true"], .glass),
  [data-glass="true"]:not(.dark):not([data-theme="dark"]),
  .glass:not(.dark):not([data-theme="dark"]) {
    --glass-blur: 20px;
    --glass-saturate: 180%;
    --surface: color-mix(in oklab, var(--white) 64%, transparent);
    --surface-secondary: color-mix(in oklab, var(--white) 48%, transparent);
    --surface-tertiary: color-mix(in oklab, var(--white) 36%, transparent);
    --overlay: color-mix(in oklab, var(--white) 80%, transparent);
    --field-background: color-mix(in oklab, var(--white) 68%, transparent);
    --default: color-mix(in oklab, var(--foreground) 8%, transparent);
    --segment: color-mix(in oklab, var(--white) 85%, transparent);
    --border: color-mix(in oklab, var(--white) 75%, var(--foreground) 12%);
    --separator: color-mix(in oklab, var(--foreground) 10%, transparent);
    --surface-shadow:
      0 8px 32px -4px rgba(15, 23, 42, 0.08),
      0 2px 6px -1px rgba(15, 23, 42, 0.04),
      0 1px 0 0 rgba(255, 255, 255, 0.75) inset;
    --overlay-shadow:
      0 20px 48px -8px rgba(15, 23, 42, 0.18),
      0 1px 0 0 rgba(255, 255, 255, 0.85) inset;
  }

  :is(.dark, [data-theme="dark"]) :is([data-glass="true"], .glass),
  :is([data-glass="true"], .glass):is(.dark, [data-theme="dark"]) {
    --glass-blur: 24px;
    --glass-saturate: 180%;
    --surface: color-mix(in oklab, var(--eclipse) 58%, transparent);
    --surface-secondary: color-mix(in oklab, var(--eclipse) 44%, transparent);
    --surface-tertiary: color-mix(in oklab, var(--eclipse) 34%, transparent);
    --overlay: color-mix(in oklab, var(--eclipse) 78%, transparent);
    --field-background: color-mix(in oklab, var(--eclipse) 58%, transparent);
    --default: color-mix(in oklab, var(--snow) 11%, transparent);
    --segment: color-mix(in oklab, var(--snow) 18%, transparent);
    --border: color-mix(in oklab, var(--snow) 16%, transparent);
    --separator: color-mix(in oklab, var(--snow) 12%, transparent);
    --surface-shadow:
      0 12px 36px -6px rgba(0, 0, 0, 0.45),
      0 1px 0 0 rgba(255, 255, 255, 0.14) inset,
      0 0 0 1px rgba(255, 255, 255, 0.08);
    --overlay-shadow:
      0 24px 56px -8px rgba(0, 0, 0, 0.65),
      0 1px 0 0 rgba(255, 255, 255, 0.18) inset,
      0 0 0 1px rgba(255, 255, 255, 0.1);
  }
}

/* ============================================================================
 * 2. BASE LAYER — Reset, Canvas, Soft Ambient Mesh Orbs & Glass Filters
 * ============================================================================ */
@layer base {
  *,
  *::before,
  *::after {
    box-sizing: border-box;
    border-color: var(--border);
  }

  html {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
  }

  body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--background);
    color: var(--foreground);
    position: relative;
    overflow-x: hidden;
  }

  /* Only animate color transitions after initial load to prevent any FOUC flash */
  html[data-theme-ready="true"] body {
    transition:
      background-color 220ms var(--ease-smooth),
      color 180ms var(--ease-smooth);
  }

  /* Softened Ambient Mesh Orbs for Glassmorphism Mode */
  body::before,
  body::after {
    content: "";
    position: fixed;
    pointer-events: none;
    z-index: -1;
    border-radius: 9999px;
    filter: blur(120px);
    opacity: 0;
  }

  body::before {
    width: 56vw;
    height: 56vw;
    max-width: 720px;
    max-height: 720px;
    top: -14%;
    left: -12%;
    background: radial-gradient(
      circle,
      color-mix(in oklab, var(--accent) 16%, transparent) 0%,
      color-mix(in oklab, var(--success) 8%, transparent) 55%,
      transparent 75%
    );
  }

  body::after {
    width: 52vw;
    height: 52vw;
    max-width: 680px;
    max-height: 680px;
    bottom: -16%;
    right: -12%;
    background: radial-gradient(
      circle,
      color-mix(in oklab, var(--accent) 14%, transparent) 0%,
      color-mix(in oklab, var(--success) 6%, transparent) 55%,
      transparent 75%
    );
  }

  [data-glass="true"] body::before,
  [data-glass="true"] body::after {
    opacity: 1;
  }

  /* Glassmorphism backdrop-filter automatic injection */
  :is([data-glass="true"], .glass) :is(
    .card:not(.card--transparent),
    .surface:not(.card .surface, .modal__dialog .surface),
    .accordion--surface .accordion__item:not(.card .accordion__item),
    .modal__dialog,
    .toast,
    .toast__close-button,
    .tooltip,
    .site-header
  ),
  :is([data-glass="true"], .glass) [data-tooltip]::after,
  :is(
    .card:not(.card--transparent),
    .surface,
    .modal__dialog,
    .toast,
    .tooltip,
    .site-header
  ):is([data-glass="true"], .glass) {
    backdrop-filter: blur(var(--glass-blur, 20px)) saturate(var(--glass-saturate, 180%));
    -webkit-backdrop-filter: blur(var(--glass-blur, 20px)) saturate(var(--glass-saturate, 180%));
  }

  /* Specular glass border on primary glass surfaces */
  :is([data-glass="true"], .glass) :is(
    .card:not(.card--transparent),
    .surface:not(.card .surface, .modal__dialog .surface),
    .accordion--surface .accordion__item:not(.card .accordion__item)
  ),
  :is(
    .card:not(.card--transparent),
    .surface
  ):is([data-glass="true"], .glass) {
    border: 1px solid color-mix(in oklab, var(--border) 65%, transparent);
  }

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

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

  svg {
    display: block;
    flex-shrink: 0;
  }
}

/* ============================================================================
 * 3. COMPONENTS LAYER — Extracted HeroUI v3 Components
 * ============================================================================ */
@layer components {
  /* --------------------------------------------------------------------------
   * Shared Primitives: Label, Description, CloseButton, Separator, Link
   * -------------------------------------------------------------------------- */
  .label {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.25rem;
    color: var(--foreground);
    user-select: none;
  }

  .description {
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--muted);
    margin: 0;
  }

  .close-button {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.875rem;
    height: 1.875rem;
    border-radius: 9999px;
    border: none;
    background: transparent;
    color: var(--muted);
    cursor: var(--cursor-interactive);
    transition: background-color 150ms var(--ease-smooth), color 150ms var(--ease-smooth), transform 150ms var(--ease-smooth);
    outline: none;
    padding: 0;
  }

  .close-button:hover {
    background-color: var(--default);
    color: var(--foreground);
  }

  .close-button:active {
    transform: scale(0.93);
  }

  .close-button:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: 2px;
  }

  .separator {
    border: none;
    background-color: var(--separator);
    flex-shrink: 0;
    margin: 0;
    height: 1px;
    width: 100%;
  }

  .typography-code,
  .typography--code {
    display: inline-flex;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.25;
    padding: 0.15rem 0.45rem;
    border-radius: var(--radius-md);
    background-color: var(--default);
    color: var(--foreground);
  }

  .link {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    line-height: 1.25rem;
    font-weight: 500;
    color: var(--link);
    text-underline-offset: 3px;
    transition: opacity 150ms var(--ease-smooth), color 150ms var(--ease-smooth);
    cursor: var(--cursor-interactive);
  }

  .link:hover {
    opacity: 0.85;
    text-decoration: underline;
  }

  .link--accent {
    color: var(--accent-soft-foreground);
    font-weight: 600;
    text-decoration: underline;
  }

  .link--muted {
    color: var(--muted);
  }

  .link--muted:hover {
    color: var(--foreground);
    text-decoration: none;
    opacity: 1;
  }

  /* --------------------------------------------------------------------------
   * Button
   * -------------------------------------------------------------------------- */
  .button {
    position: relative;
    isolation: isolate;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    height: 2.25rem;
    width: fit-content;
    padding: 0 1rem;
    border-radius: min(9999px, var(--radius-3xl));
    font-size: 0.875rem;
    line-height: 1.25rem;
    font-weight: 600;
    white-space: nowrap;
    outline: none;
    user-select: none;
    border: 1px solid transparent;
    cursor: var(--cursor-interactive);
    transform-origin: center;
    transition:
      transform 220ms var(--ease-smooth),
      background-color 120ms var(--ease-out),
      border-color 120ms var(--ease-out),
      color 120ms var(--ease-out),
      box-shadow 120ms var(--ease-out);

    --button-bg: var(--accent);
    --button-bg-hover: var(--accent-hover);
    --button-fg: var(--accent-foreground);

    background-color: var(--button-bg);
    color: var(--button-fg);
  }

  .button svg {
    width: 1rem;
    height: 1rem;
    pointer-events: none;
  }

  .button:hover:not(:disabled):not([aria-disabled="true"]) {
    background-color: var(--button-bg-hover);
  }

  .button:active:not(:disabled):not([aria-disabled="true"]),
  .button[data-pressed="true"] {
    transform: scale(0.97);
  }

  .button:focus-visible {
    outline: 2px solid var(--focus);
    outline-offset: var(--ring-offset-width);
  }

  .button--sm {
    height: 2rem;
    padding: 0 0.875rem;
    font-size: 0.8125rem;
  }

  .button--lg {
    height: 2.75rem;
    padding: 0 1.375rem;
    font-size: 0.9375rem;
  }

  .button--primary {
    --button-bg: var(--accent);
    --button-bg-hover: var(--accent-hover);
    --button-fg: var(--accent-foreground);
  }

  .button--secondary {
    --button-bg: var(--default);
    --button-bg-hover: var(--default-hover);
    --button-fg: var(--accent-soft-foreground);
  }

  .button--tertiary {
    --button-bg: var(--default);
    --button-bg-hover: var(--default-hover);
    --button-fg: var(--default-foreground);
  }

  .button--outline {
    --button-bg: transparent;
    --button-bg-hover: color-mix(in oklab, var(--default) 65%, transparent);
    --button-fg: var(--default-foreground);
    border-color: var(--border);
  }

  .button--ghost {
    --button-bg: transparent;
    --button-bg-hover: var(--default);
    --button-fg: var(--default-foreground);
  }

  .button--icon-only {
    width: 2.25rem;
    padding: 0;
  }

  .button--icon-only.button--sm {
    width: 2rem;
  }

  .button--full-width {
    width: 100%;
  }

  /* --------------------------------------------------------------------------
   * Card & Surface
   * -------------------------------------------------------------------------- */
  .card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
    padding: 1.5rem;
    border-radius: min(32px, var(--radius-3xl));
    background-color: var(--surface);
    color: var(--surface-foreground);
    box-shadow: var(--surface-shadow);
    transition: background-color 200ms var(--ease-smooth), box-shadow 200ms var(--ease-smooth), border-color 200ms var(--ease-smooth), transform 220ms var(--ease-out);
  }

  .card__header {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
  }

  .card__title {
    font-size: 1.0625rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--foreground);
    margin: 0;
  }

  .card__description {
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--muted);
    margin: 0;
  }

  .card__content {
    display: flex;
    flex: 1;
    flex-direction: column;
    gap: 0.625rem;
  }

  .card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding-top: 0.25rem;
  }

  .surface {
    padding: 1rem;
    border-radius: min(24px, var(--radius-2xl));
    background-color: var(--surface);
    color: var(--surface-foreground);
    box-shadow: var(--surface-shadow);
  }

  .surface--secondary {
    background-color: var(--surface-secondary);
    box-shadow: none;
  }

  /* --------------------------------------------------------------------------
   * Chip / Badge
   * -------------------------------------------------------------------------- */
  .chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    height: 1.625rem;
    padding: 0 0.675rem;
    border-radius: min(9999px, var(--radius-3xl));
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1.25rem;
    white-space: nowrap;
    background-color: var(--default);
    color: var(--default-foreground);
    border: 1px solid transparent;
  }

  .chip--accent {
    background-color: var(--accent-soft);
    color: var(--accent-soft-foreground);
  }

  .chip--outline {
    background-color: transparent;
    border-color: var(--border);
  }

  .chip__dot {
    width: 0.4rem;
    height: 0.4rem;
    border-radius: 9999px;
    background-color: var(--accent);
  }

  /* --------------------------------------------------------------------------
   * Accordion (FAQ Collapsible List)
   * -------------------------------------------------------------------------- */
  .accordion {
    display: flex;
    flex-direction: column;
    width: 100%;
  }

  .accordion--surface {
    gap: 0.625rem;
  }

  .accordion__item {
    border-bottom: 1px solid var(--separator);
  }

  .accordion__item:last-child {
    border-bottom: none;
  }

  .accordion--surface .accordion__item {
    border: none;
    border-radius: min(20px, var(--radius-2xl));
    background-color: var(--surface);
    box-shadow: var(--surface-shadow);
    padding: 0 1.25rem;
  }

  .accordion__trigger {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.125rem 0;
    border: none;
    background: transparent;
    color: var(--foreground);
    font-size: 0.96875rem;
    font-weight: 600;
    text-align: start;
    cursor: var(--cursor-interactive);
    outline: none;
    transition: color 150ms var(--ease-smooth);
  }

  .accordion__chevron {
    color: var(--muted);
    transition: transform 220ms var(--ease-out-fluid), color 150ms var(--ease-smooth);
    flex-shrink: 0;
  }

  .accordion__item[data-expanded="true"] .accordion__chevron {
    transform: rotate(180deg);
    color: var(--accent-soft-foreground);
  }

  .accordion__panel {
    padding-bottom: 1.125rem;
    font-size: 0.90625rem;
    line-height: 1.65;
    color: var(--muted);
  }

  .accordion__item:not([data-expanded="true"]) .accordion__panel {
    display: none;
  }

  /* --------------------------------------------------------------------------
   * Overlays: Modal, Tooltip, Toast
   * -------------------------------------------------------------------------- */
  .overlay-backdrop {
    position: fixed;
    inset: 0;
    background-color: var(--backdrop);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 220ms var(--ease-out);
  }

  .overlay-backdrop[data-open="true"] {
    opacity: 1;
    pointer-events: auto;
  }

  .modal__dialog {
    position: relative;
    width: 100%;
    max-width: 24rem;
    border-radius: min(32px, var(--radius-3xl));
    background-color: var(--overlay);
    color: var(--overlay-foreground);
    box-shadow: var(--overlay-shadow);
    border: 1px solid color-mix(in oklab, var(--border) 65%, transparent);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.125rem;
    transform: scale(0.95) translateY(8px);
    transition: transform 240ms var(--ease-out-fluid);
  }

  .overlay-backdrop[data-open="true"] .modal__dialog {
    transform: scale(1) translateY(0);
  }

  .modal__header {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.625rem;
  }

  .modal__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 9999px;
    flex-shrink: 0;
    background-color: var(--accent-soft);
    color: var(--accent-soft-foreground);
  }

  .modal__close-trigger {
    position: absolute;
    top: 1rem;
    inset-inline-end: 1rem;
    z-index: 10;
  }

  .modal__body {
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--muted);
    margin: -4px;
    padding: 4px;
    overflow: visible;
  }

  .modal__footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.5rem;
    width: 100%;
    padding-top: 0.25rem;
  }

  .modal__footer--split > .button {
    flex: 1;
    width: 100%;
  }

  /* Tooltip */
  [data-tooltip] {
    position: relative;
    display: inline-flex;
  }

  [data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    padding: 0.375rem 0.625rem;
    border-radius: min(12px, var(--radius-xl));
    background-color: var(--overlay);
    color: var(--overlay-foreground);
    border: 1px solid color-mix(in oklab, var(--border) 65%, transparent);
    font-size: 0.75rem;
    line-height: 1.25;
    font-weight: 500;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    box-shadow: var(--overlay-shadow);
    transition: opacity 150ms var(--ease-out), transform 150ms var(--ease-out);
    z-index: var(--z-tooltip);
  }

  [data-tooltip]:not([data-tooltip-placement])::after,
  [data-tooltip][data-tooltip-placement="top"]::after {
    bottom: calc(100% + 0.5rem);
    left: 50%;
    transform: translate(-50%, 4px) scale(0.95);
  }

  [data-tooltip]:not([data-tooltip-placement]):hover::after,
  [data-tooltip][data-tooltip-placement="top"]:hover::after {
    opacity: 1;
    transform: translate(-50%, 0) scale(1);
  }

  [data-tooltip][data-tooltip-placement="bottom"]::after {
    top: calc(100% + 0.5rem);
    left: 50%;
    transform: translate(-50%, -4px) scale(0.95);
  }

  [data-tooltip][data-tooltip-placement="bottom"]:hover::after {
    opacity: 1;
    transform: translate(-50%, 0) scale(1);
  }

  @media (hover: none) {
    [data-tooltip]::after {
      display: none;
    }
  }

  /* Toast Stack Region (Positioned below the 4rem Sticky Navbar) */
  .toast-region {
    position: fixed;
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.625rem;
    max-width: 24rem;
    width: calc(100vw - 2rem);
    pointer-events: none;
  }

  .toast-region[data-placement="top"],
  .toast-region:not([data-placement]) {
    top: 4.75rem;
    left: 50%;
    transform: translateX(-50%);
  }

  .toast {
    position: relative;
    pointer-events: auto;
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.75rem 1.125rem;
    border-radius: min(9999px, var(--radius-3xl));
    background-color: var(--overlay);
    color: var(--overlay-foreground);
    box-shadow: var(--overlay-shadow);
    border: 1px solid color-mix(in oklab, var(--border) 65%, transparent);
    animation: maiya-toast-top-in 260ms var(--ease-out-fluid);
    max-width: 100%;
  }

  .toast__indicator {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--success-soft-foreground);
    flex-shrink: 0;
  }

  .toast__content {
    display: flex;
    flex-direction: column;
    min-width: 0;
  }

  .toast__title {
    font-size: 0.875rem;
    line-height: 1.35;
    font-weight: 600;
    color: var(--overlay-foreground);
    margin: 0;
  }

  .toast--success .toast__indicator {
    color: var(--success);
  }

  @keyframes maiya-toast-top-in {
    from {
      opacity: 0;
      transform: translateY(-12px) scale(0.95);
    }
    to {
      opacity: 1;
      transform: translateY(0) scale(1);
    }
  }
}

/* ============================================================================
 * 4. PAGE LAYOUT & SECTIONS UTILITIES
 * ============================================================================ */
@layer utilities {
  .container {
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 1.25rem;
  }

  /* --------------------------------------------------------------------------
   * 1. Sticky Navbar
   * -------------------------------------------------------------------------- */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: color-mix(in oklab, var(--background) 80%, transparent);
    backdrop-filter: blur(var(--glass-blur, 16px)) saturate(var(--glass-saturate, 180%));
    -webkit-backdrop-filter: blur(var(--glass-blur, 16px)) saturate(var(--glass-saturate, 180%));
    border-bottom: 1px solid color-mix(in oklab, var(--separator) 80%, transparent);
  }

  :is([data-glass="true"], .glass) .site-header {
    background-color: var(--surface);
  }

  .site-header__inner {
    height: 4rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
  }

  .brand-logo {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
  }

  .brand-logo__img {
    height: 2rem;
    width: auto;
    display: block;
  }

  /* Instant CSS-driven Light/Dark Logo switching (Zero JS FOUC) */
  .dark .brand-logo__img--light,
  [data-theme="dark"] .brand-logo__img--light {
    display: none !important;
  }

  :root:not(.dark):not([data-theme="dark"]) .brand-logo__img--dark {
    display: none !important;
  }

  /* Instant CSS-driven Mode Icon switching (system / light / dark) */
  .mode-icon {
    display: none;
  }

  html[data-color-mode="system"] .mode-icon--system,
  html:not([data-color-mode]) .mode-icon--system {
    display: inline-flex;
  }

  html[data-color-mode="light"] .mode-icon--light {
    display: inline-flex;
  }

  html[data-color-mode="dark"] .mode-icon--dark {
    display: inline-flex;
  }

  /* --------------------------------------------------------------------------
   * 2. First Screen (Hero + Trial Config Card)
   * -------------------------------------------------------------------------- */
  .hero-section {
    text-align: center;
    padding: 3.5rem 0 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
  }

  .hero-title {
    font-size: clamp(2rem, 5vw, 3.25rem);
    line-height: 1.22;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin: 0;
    color: var(--foreground);
  }

  /* Pure Emerald-to-Mint Gradient (Scheme A: Zero gray/black muddiness) */
  .hero-title__highlight {
    display: block;
    margin-top: 0.25rem;
    background: linear-gradient(135deg, #15803d 0%, #16a34a 45%, #10b981 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

  .dark .hero-title__highlight,
  [data-theme="dark"] .hero-title__highlight {
    background: linear-gradient(135deg, #bbf7d0 0%, #86efac 50%, #34d399 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

  .hero-desc {
    font-size: clamp(0.95rem, 2vw, 1.0625rem);
    max-width: 580px;
    line-height: 1.65;
    color: var(--muted);
    margin: 0;
  }

  /* Trial Configuration Card */
  .trial-card {
    width: 100%;
    max-width: 420px;
    margin-top: 0.5rem;
    padding: 1.5rem;
    text-align: start;
    gap: 1.125rem;
  }

  .trial-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
  }

  .trial-card__title-wrap {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .trial-config-list {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
    padding: 1rem 1.125rem;
    border-radius: min(20px, var(--radius-2xl));
    background-color: var(--surface-secondary);
    border: 1px solid color-mix(in oklab, var(--border) 60%, transparent);
  }

  .trial-config-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    font-size: 0.9rem;
    line-height: 1.4;
  }

  .trial-config-row__label {
    color: var(--muted);
    font-weight: 500;
  }

  .trial-config-row__value {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--foreground);
    letter-spacing: 0.01em;
    user-select: all;
  }

  /* Bookmark / Share CTA (Clean Pure Text Button) */
  .share-trigger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    margin-top: 0.25rem;
    padding: 0.25rem 0.5rem;
    border: none;
    background: transparent;
    color: var(--muted);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: var(--cursor-interactive);
    transition: color 150ms var(--ease-smooth);
  }

  .share-trigger:hover {
    color: var(--foreground);
  }

  .share-trigger__arrow {
    display: inline-block;
    transition: transform 150ms var(--ease-out);
  }

  .share-trigger:hover .share-trigger__arrow {
    transform: translate(2px, -2px);
  }

  /* Scroll-to-Tutorial Guide Button */
  .scroll-guide {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    margin-top: 0.5rem;
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    color: var(--muted);
    font-size: 0.84375rem;
    font-weight: 500;
    cursor: var(--cursor-interactive);
    transition: color 150ms var(--ease-smooth);
  }

  .scroll-guide:hover {
    color: var(--foreground);
  }

  .scroll-guide__arrow {
    animation: maiya-bounce-down 1.8s infinite ease-in-out;
    color: var(--accent-soft-foreground);
  }

  @keyframes maiya-bounce-down {
    0%, 100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(5px);
    }
  }

  /* --------------------------------------------------------------------------
   * 3. Section Common Header (Part 2 Tutorial & Part 3 FAQ)
   * -------------------------------------------------------------------------- */
  .page-section {
    padding: 3.5rem 0;
    scroll-margin-top: 4.5rem;
  }

  .page-section--faq {
    padding-top: 3.5rem;
    padding-bottom: 6.5rem;
  }

  .section-header {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2.25rem;
  }

  .section-title {
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--foreground);
    margin: 0;
  }

  .section-desc {
    font-size: 0.9375rem;
    color: var(--muted);
    margin: 0;
  }

  /* --------------------------------------------------------------------------
   * 4. Tutorial 3-Steps Grid
   * -------------------------------------------------------------------------- */
  .steps-grid {
    display: grid;
    grid-template-columns: repeat(1, minmax(0, 1fr));
    gap: 1.5rem;
    align-items: stretch;
  }

  @media (min-width: 820px) {
    .steps-grid {
      grid-template-columns: repeat(3, minmax(0, 1fr));
    }
  }

  .step-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 1.25rem;
    padding: 1.5rem;
  }

  .step-card__top {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
  }

  .step-card__title {
    font-size: 1.125rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--foreground);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.625rem;
  }

  .step-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.625rem;
    height: 1.625rem;
    border-radius: 9999px;
    background-color: var(--accent-soft);
    color: var(--accent-soft-foreground);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 700;
    line-height: 1;
    flex-shrink: 0;
  }

  .step-card__desc {
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--muted);
    margin: 0;
  }

  .step-card__figure {
    margin: 0;
    width: 100%;
    border-radius: 1.25rem;
    overflow: hidden;
    background-color: var(--surface-secondary);
    border: 1px solid color-mix(in oklab, var(--border) 75%, transparent);
    box-shadow: var(--surface-shadow);
  }

  .step-card__img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: cover;
  }

  /* --------------------------------------------------------------------------
   * 5. FAQ Section Wrapper
   * -------------------------------------------------------------------------- */
  .faq-wrapper {
    max-width: 760px;
    margin: 0 auto;
  }

  /* --------------------------------------------------------------------------
   * 6. Footer
   * -------------------------------------------------------------------------- */
  .site-footer {
    margin-top: auto;
    padding: 2.25rem 1.25rem 3rem;
    border-top: 1px solid var(--separator);
    text-align: center;
    font-size: 0.8125rem;
    line-height: 1.65;
    color: var(--muted);
  }

  /* --------------------------------------------------------------------------
   * 7. Flex & Spacing Helpers
   * -------------------------------------------------------------------------- */
  .flex { display: flex; }
  .inline-flex { display: inline-flex; }
  .flex-col { flex-direction: column; }
  .items-center { align-items: center; }
  .justify-between { justify-content: space-between; }
  .justify-center { justify-content: center; }
  .flex-wrap { flex-wrap: wrap; }
  .gap-2 { gap: 0.5rem; }
  .gap-3 { gap: 0.75rem; }
  .gap-4 { gap: 1rem; }
  .w-full { width: 100%; }
}