:root {
  /* ━━━ Cyan → Purple gradient brand — single source of truth ━━━ */
  --color-grad-start: #00c9c8; /* Cyan left anchor */
  --color-grad-mid: #4a6fe3; /* Blue midpoint */
  --color-grad-end: #8b2fc9; /* Purple right anchor */

  --color-primary: #4a6fe3;
  --color-primary-light: #6f8ff0;
  --color-primary-lighter: #c4d0fa;
  --color-primary-pale: #eef1fd;
  --color-primary-dark: #2a4fbf;
  --color-primary-deeper: #1a2d7a;

  --color-accent-cyan: #00c9c8;
  --color-accent-purple: #8b2fc9;
  --color-accent: #00c9c8;

  --color-white: #ffffff;
  --color-text-on-primary: #ffffff;
  --color-text-primary: #1a1a2e;
  --color-text-secondary: #4a4a6a;
  --color-border: #c4d0fa;
  --color-bg-page: #f5f6ff;
  --color-bg-card: #ffffff;
  --color-success: #2d8a4e;
  --color-error: #d94040;
  --color-warning: #8b2fc9;
  --color-info: #4a6fe3;

  /* Master gradients (dùng ở mọi nơi cần gradient) */
  --gradient-brand: linear-gradient(90deg, #00c9c8 0%, #4a6fe3 50%, #8b2fc9 100%);
  --gradient-brand-135: linear-gradient(135deg, #00c9c8 0%, #4a6fe3 50%, #8b2fc9 100%);
  --gradient-brand-vertical: linear-gradient(180deg, #00c9c8 0%, #4a6fe3 50%, #8b2fc9 100%);

  /* Semantic aliases (used across the app) */
  --bg: var(--color-bg-page);
  --card: var(--color-bg-card);
  --text: var(--color-text-primary);
  --muted: var(--color-text-secondary);
  --line: var(--color-border);

  --primary: var(--color-primary);
  --primary-600: var(--color-primary);
  --primary-700: var(--color-primary-dark);
  --primary-soft: var(--color-primary-pale);
  --primary-soft-strong: rgba(74, 111, 227, 0.15);

  --success: var(--color-success);
  --success-soft: #e8f5ec;
  --warning: var(--color-warning);
  --warning-soft: var(--color-primary-pale);
  --error: var(--color-error);
  --error-soft: #fdecec;
  --info: var(--color-info);
  --info-soft: var(--color-primary-pale);
  --accent: var(--color-accent);

  /* Legacy scale tokens → brand mapping */
  --blue-50: var(--color-primary-pale);
  --blue-200: var(--color-primary-lighter);
  --blue-600: var(--color-primary);
  --blue-800: var(--color-primary-dark);

  --slate-50: var(--color-primary-pale);
  --slate-200: var(--color-border);
  --slate-600: var(--color-text-secondary);
  --slate-800: var(--color-text-primary);
  --slate-900: #141426;

  --teal-50: var(--success-soft);
  --teal-200: #b8dcc4;
  --teal-600: var(--color-success);
  --teal-800: #1f6b3a;

  --amber-50: var(--color-primary-pale);
  --amber-200: var(--color-primary-lighter);
  --amber-600: var(--color-accent-cyan);
  --amber-800: var(--color-primary-dark);

  --red-50: var(--error-soft);
  --red-200: #f5b8b8;
  --red-600: var(--color-error);
  --red-800: #a82e2e;

  --violet-50: var(--color-primary-pale);
  --violet-200: var(--color-primary-lighter);
  --violet-600: var(--color-accent-purple);
  --violet-800: var(--color-primary-dark);

  --orange-500: var(--color-primary-light);
  --orange-600: var(--color-primary);
  --orange-700: var(--color-primary-dark);
  --orange-800: var(--color-primary-deeper);

  /* Sidebar / shell — deep navy → purple */
  --sidebar-bg: #1a2d7a;
  --sidebar-bg-deep: #3a1a6e;
  --sidebar-accent: #00c9c8;
  --sidebar-hover: rgba(255, 255, 255, 0.1);
  --sidebar-active: rgba(255, 255, 255, 0.18);
  --sidebar-active-bg: rgba(0, 201, 200, 0.18);
  --sidebar-active-shadow: rgba(0, 0, 0, 0.25);
  --sidebar-text: rgba(255, 255, 255, 0.78);
  --sidebar-text-strong: var(--color-text-on-primary);
  --sidebar-muted: rgba(255, 255, 255, 0.65);
  --sidebar-border: rgba(255, 255, 255, 0.18);

  --focus-ring: 0 0 0 3px rgba(74, 111, 227, 0.15);
  --focus-ring-strong: 0 0 0 3px rgba(74, 111, 227, 0.25);
  --overlay-backdrop: rgba(26, 45, 122, 0.35);
  --selection-bg: rgba(74, 111, 227, 0.2);
  --placeholder-color: #a0aacc;
}

* {
  box-sizing: border-box;
}

html {
  height: 100%;
  min-height: 100%;
}

body {
  min-height: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  display: flex;
  flex-direction: column;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--color-text-primary);
  background: var(--color-bg-page);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  color: var(--color-primary-dark);
}

h1 {
  font-size: 2rem;
}
h2 {
  font-size: 1.5rem;
}
h3 {
  font-size: 1.25rem;
}

p {
  margin: 0;
  color: var(--color-text-primary);
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

::selection {
  background: var(--selection-bg);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  border: 1px solid var(--color-border);
  padding: 10px;
  font-size: 14px;
  text-align: left;
}

thead th {
  background: var(--color-primary-pale);
  color: var(--color-primary-dark);
  font-weight: 700;
}

tbody tr:hover td {
  background: rgba(74, 111, 227, 0.05);
}

tbody tr.is-selected td,
tbody tr.selected td {
  background: rgba(74, 111, 227, 0.1);
  border-left: 3px solid var(--color-primary);
}

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

input::placeholder,
textarea::placeholder {
  color: var(--placeholder-color);
}

input:not([type="checkbox"]):not([type="radio"]):not([type="range"]),
select,
textarea {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-bg-card);
  color: var(--color-text-primary);
}

input:not([type="checkbox"]):not([type="radio"]):not([type="range"]):focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--focus-ring);
}

input[type="checkbox"],
input[type="radio"] {
  accent-color: var(--color-primary);
}

input[type="range"] {
  accent-color: var(--color-primary);
}

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

hr {
  border: 0;
  border-top: 1px solid var(--color-border);
}

/* Scrollbars */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-primary-lighter) var(--color-primary-pale);
}

*::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

*::-webkit-scrollbar-track {
  background: var(--color-primary-pale);
}

*::-webkit-scrollbar-thumb {
  background: var(--color-primary-lighter);
  border-radius: 999px;
}

*::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* i18n */
html.fm-i18n-transitioning .app,
html.fm-i18n-transitioning body {
  transition: opacity 0.18s ease;
  opacity: 0.94;
}

html[data-fm-lang]:not([data-fm-lang="ja"]) ruby rt {
  display: none !important;
}
html[data-fm-lang="ja"][data-fm-furigana="0"] ruby rt {
  display: none !important;
}
html[data-fm-lang="ja"][data-fm-furigana="1"] ruby {
  ruby-position: over;
}
html[data-fm-lang="ja"][data-fm-furigana="1"] ruby rt {
  font-size: 0.52em;
  line-height: 1.1;
  font-weight: 500;
  user-select: none;
}

@media print {
  :root {
    --color-primary: #4a6fe3;
    --color-primary-dark: #2a4fbf;
    --sidebar-bg: #1a2d7a;
    --sidebar-bg-deep: #1a2d7a;
  }

  body {
    background: #fff !important;
    color: #000 !important;
  }

  a {
    color: #4a6fe3 !important;
  }
}