/* ============================================================
   Type by JobAssam — Design System
   Aesthetic: Washi (和紙) — warm paper textures, ink-wash calm,
   precise typographic rhythm, editorial restraint
   ============================================================ */

/* --- Font Faces --- */
@font-face {
  font-family: 'Noto Serif Bengali';
  src: url('../fonts/noto-serif-bengali-bengali.woff2') format('woff2');
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0951-0952, U+0964-0965, U+0980-09FE, U+1CD0, U+1CD2,
    U+1CD5-1CD6, U+1CD8, U+1CE1, U+1CEA, U+1CED, U+1CF2, U+1CF5-1CF7,
    U+200C-200D, U+20B9, U+25CC, U+A8F1;
}

@font-face {
  font-family: 'Noto Serif Bengali';
  src: url('../fonts/noto-serif-bengali-latin.woff2') format('woff2');
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122,
    U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Noto Serif Bengali';
  src: url('../fonts/noto-serif-bengali-latin-ext.woff2') format('woff2');
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7,
    U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F,
    U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}

@font-face {
  font-family: 'Inter';
  src: url('../fonts/inter-latin.woff2') format('woff2');
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
    U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122,
    U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Inter';
  src: url('../fonts/inter-latin-ext.woff2') format('woff2');
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7,
    U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F,
    U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}


/* --- Design Tokens: Light Mode --- */
:root {
  /* Surfaces — warm paper tones */
  --bg-body: #F6F3EE;
  --bg-surface: #FFFFFF;
  --bg-surface-hover: #FAF8F5;
  --bg-surface-active: #F2EFE9;
  --bg-editor: #FFFEFB;
  --bg-toolbar: #FAFAF7;
  --bg-panel: #F9F7F3;

  /* Text — deep sumi ink */
  --text-primary: #1B1918;
  --text-secondary: #6E6962;
  --text-tertiary: #A39E96;
  --text-placeholder: #C4BFBA;
  --text-inverse: #FFFEFB;

  /* Accent — indigo ink */
  --accent: #3D5A80;
  --accent-hover: #2C4464;
  --accent-muted: #3D5A8018;
  --accent-light: #E8EEF4;

  /* Borders */
  --border-subtle: #E8E4DE;
  --border-medium: #D9D4CC;
  --border-strong: #C4BFBA;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(27, 25, 24, 0.04);
  --shadow-sm: 0 1px 3px rgba(27, 25, 24, 0.06), 0 1px 2px rgba(27, 25, 24, 0.04);
  --shadow-md: 0 4px 12px rgba(27, 25, 24, 0.06), 0 2px 4px rgba(27, 25, 24, 0.04);
  --shadow-lg: 0 8px 24px rgba(27, 25, 24, 0.08), 0 4px 8px rgba(27, 25, 24, 0.04);
  --shadow-dropdown: 0 8px 32px rgba(27, 25, 24, 0.12), 0 2px 8px rgba(27, 25, 24, 0.06);

  /* Status */
  --success: #4A7C59;
  --success-bg: #EFF6F0;

  /* Keyboard */
  --key-bg: #FFFFFF;
  --key-bg-hover: #F5F2ED;
  --key-bg-active: #ECE8E2;
  --key-border: #DDD8D1;
  --key-shadow: 0 1px 0 #C4BFBA, 0 2px 4px rgba(27, 25, 24, 0.06);
  --key-shadow-active: 0 0 0 transparent;

  /* Suggestion */
  --suggestion-bg: #FFFFFF;
  --suggestion-hover: #F5F2ED;
  --suggestion-active: #E8EEF4;

  /* Misc */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --transition-fast: 120ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 350ms ease;
  --transition-theme: 450ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Typography */
  --font-ui: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-assamese: 'Noto Serif Bengali', serif;
  --editor-font-size: 20px;
  --editor-line-height: 1.9;

  /* Layout */
  --max-width: 840px;
  --header-height: 56px;
  --toolbar-height: 46px;
  --status-height: 34px;
}


/* --- Design Tokens: Dark Mode --- */
html.dark-mode {
  --bg-body: #111110;
  --bg-surface: #1A1918;
  --bg-surface-hover: #222120;
  --bg-surface-active: #2A2928;
  --bg-editor: #1E1D1B;
  --bg-toolbar: #191817;
  --bg-panel: #1C1B19;

  --text-primary: #E8E4DE;
  --text-secondary: #9C9690;
  --text-tertiary: #6E6962;
  --text-placeholder: #524E49;
  --text-inverse: #1B1918;

  --accent: #7BA4CC;
  --accent-hover: #9BBDDB;
  --accent-muted: #7BA4CC18;
  --accent-light: #1E2A38;

  --border-subtle: #2A2928;
  --border-medium: #3A3836;
  --border-strong: #4A4744;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3), 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.35), 0 4px 8px rgba(0, 0, 0, 0.2);
  --shadow-dropdown: 0 8px 32px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.25);

  --success: #6DAE7E;
  --success-bg: #1A261D;

  --key-bg: #222120;
  --key-bg-hover: #2E2D2B;
  --key-bg-active: #3A3836;
  --key-border: #3A3836;
  --key-shadow: 0 1px 0 #111110, 0 2px 4px rgba(0, 0, 0, 0.3);
  --key-shadow-active: 0 0 0 transparent;

  --suggestion-bg: #1A1918;
  --suggestion-hover: #252423;
  --suggestion-active: #1E2A38;
}


/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-theme), color var(--transition-theme);
}

::selection {
  background: var(--accent);
  color: var(--text-inverse);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-strong);
}


/* --- App Container --- */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
}


/* ============================================================
   HEADER
   ============================================================ */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 2px;
  flex-shrink: 0;
  user-select: none;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-brand-icon {
  width: 30px;
  height: 30px;
  background: var(--accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-assamese);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.header-brand-text {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  transition: color var(--transition-theme);
}

.header-brand-text span {
  font-weight: 400;
  color: var(--text-secondary);
  transition: color var(--transition-theme);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Mode toggle pill */
.mode-toggle {
  display: flex;
  align-items: center;
  background: var(--bg-surface-active);
  border-radius: var(--radius-xl);
  padding: 3px;
  gap: 2px;
  border: 1px solid var(--border-subtle);
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.mode-toggle-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border: none;
  border-radius: calc(var(--radius-xl) - 3px);
  background: transparent;
  color: var(--text-tertiary);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  line-height: 1;
}

.mode-toggle-btn .mode-icon {
  font-family: var(--font-assamese);
  font-size: 14px;
  line-height: 1;
}

.mode-toggle-btn.active {
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-xs);
}

.mode-toggle-btn:not(.active):hover {
  color: var(--text-secondary);
}

/* Icon buttons */
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  flex-shrink: 0;
}

.icon-btn:hover {
  background: var(--bg-surface-active);
  color: var(--text-primary);
}

.icon-btn:active {
  transform: scale(0.94);
}

.icon-btn svg {
  width: 18px;
  height: 18px;
  stroke-width: 1.75;
}

.icon-btn.active {
  color: var(--accent);
  background: var(--accent-muted);
}

/* Divider in header */
.header-divider {
  width: 1px;
  height: 20px;
  background: var(--border-subtle);
  margin: 0 4px;
  transition: background-color var(--transition-theme);
}


/* ============================================================
   TOOLBAR
   ============================================================ */
.toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  min-height: var(--toolbar-height);
  padding: 4px;
  gap: 2px;
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
  transition: border-color var(--transition-theme);
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 1px;
}

.toolbar-divider {
  width: 1px;
  height: 22px;
  background: var(--border-subtle);
  margin: 0 6px;
  flex-shrink: 0;
  transition: background-color var(--transition-theme);
}

/* Toolbar buttons */
.tool-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  min-width: 32px;
  padding: 0 8px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  gap: 5px;
  white-space: nowrap;
  position: relative;
}

.tool-btn:hover {
  background: var(--bg-surface-active);
  color: var(--text-primary);
}

.tool-btn:active {
  transform: scale(0.95);
}

.tool-btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  stroke-width: 1.75;
}

.tool-btn .tool-label {
  display: none;
}

@media (min-width: 720px) {
  .tool-btn .tool-label {
    display: inline;
  }
}

/* Font size controls */
.font-size-group {
  display: flex;
  align-items: center;
  gap: 0;
}

.font-size-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1;
}

.font-size-btn:hover {
  background: var(--bg-surface-active);
  color: var(--text-primary);
}

.font-size-btn:active {
  transform: scale(0.92);
}

.font-size-btn.decrease,
.font-size-btn.increase {
  font-size: 13px;
}

.font-size-value {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-tertiary);
  min-width: 28px;
  text-align: center;
  tabular-nums: lining-nums;
  font-variant-numeric: tabular-nums;
  transition: color var(--transition-theme);
}


/* ============================================================
   EDITOR
   ============================================================ */
.editor-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  min-height: 0;
}

.editor {
  flex: 1;
  min-height: 320px;
  padding: 32px 28px;
  font-family: var(--font-assamese);
  font-size: var(--editor-font-size);
  line-height: var(--editor-line-height);
  color: var(--text-primary);
  background: transparent;
  border: none;
  outline: none;
  overflow-y: auto;
  word-wrap: break-word;
  overflow-wrap: break-word;
  white-space: pre-wrap;
  caret-color: var(--accent);
  cursor: text;
  transition: color var(--transition-theme);
  position: relative;
}

.editor:empty::before {
  content: attr(data-placeholder);
  color: var(--text-placeholder);
  pointer-events: none;
  font-style: normal;
  transition: color var(--transition-theme);
}

/* Active buffer underline (for phonetic preview) */
.editor .buffer-preview {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-style: dotted;
  text-underline-offset: 4px;
}

/* Editor area paper effect */
.editor-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-editor);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  margin: 12px 0 0;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition:
    background-color var(--transition-theme),
    border-color var(--transition-theme),
    box-shadow var(--transition-theme);
  position: relative;
}

.editor-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 20% 0%, var(--accent-muted) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, var(--accent-muted) 0%, transparent 50%);
  opacity: 0.5;
  z-index: 0;
  transition: opacity var(--transition-theme);
}

.editor-container:focus-within {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-md), 0 0 0 3px var(--accent-muted);
}


/* ============================================================
   SUGGESTION DROPDOWN
   ============================================================ */
.suggestion-dropdown {
  position: absolute;
  z-index: 100;
  min-width: 180px;
  max-width: 320px;
  max-height: 240px;
  overflow-y: auto;
  background: var(--suggestion-bg);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-dropdown);
  padding: 4px;
  display: none;
  transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.suggestion-dropdown.visible {
  display: block;
  animation: dropdown-in 150ms cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes dropdown-in {
  from {
    opacity: 0;
    transform: translateY(-4px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.suggestion-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  gap: 12px;
}

.suggestion-item:hover,
.suggestion-item.active {
  background: var(--suggestion-hover);
}

.suggestion-item.selected {
  background: var(--suggestion-active);
}

.suggestion-text {
  font-family: var(--font-assamese);
  font-size: 17px;
  color: var(--text-primary);
  line-height: 1.4;
}

.suggestion-hint {
  font-size: 11px;
  color: var(--text-tertiary);
  font-family: var(--font-ui);
  flex-shrink: 0;
}


/* ============================================================
   STATUS BAR
   ============================================================ */
.status-bar {
  display: flex;
  align-items: center;
  height: var(--status-height);
  padding: 0 8px;
  gap: 16px;
  border-top: 1px solid var(--border-subtle);
  font-size: 12px;
  color: var(--text-tertiary);
  font-weight: 400;
  user-select: none;
  flex-shrink: 0;
  transition: border-color var(--transition-theme), color var(--transition-theme);
  font-variant-numeric: tabular-nums;
}

.status-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.status-divider {
  color: var(--border-medium);
}

.status-save {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 5px;
}

.status-save-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.status-save-dot.saved {
  opacity: 1;
}

.status-save svg {
  width: 13px;
  height: 13px;
  stroke-width: 2;
  color: var(--success);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.status-save.saved svg {
  opacity: 1;
}


/* ============================================================
   VIRTUAL KEYBOARD
   ============================================================ */
.keyboard-panel {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-panel);
  padding: 12px 0;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition:
    max-height var(--transition-slow),
    opacity var(--transition-base),
    padding var(--transition-slow),
    background-color var(--transition-theme),
    border-color var(--transition-theme);
}

.keyboard-panel.visible {
  max-height: 320px;
  opacity: 1;
  padding: 16px 0;
}

.keyboard-toggle-bar {
  display: flex;
  justify-content: center;
  padding: 4px 0;
}

.keyboard-toggle-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.keyboard-toggle-btn:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.keyboard-toggle-btn.active {
  background: var(--accent-light);
  color: var(--accent);
  border-color: var(--accent);
}

.keyboard-toggle-btn svg {
  width: 14px;
  height: 14px;
  stroke-width: 1.75;
}

.keyboard-grid {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 0 4px;
}

.keyboard-row {
  display: flex;
  gap: 5px;
  justify-content: center;
}

/* Keyboard keys — styled in keyboard.css, base structure here */
.vk-key {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 44px;
  border: 1px solid var(--key-border);
  border-radius: var(--radius-sm);
  background: var(--key-bg);
  box-shadow: var(--key-shadow);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
  font-family: var(--font-assamese);
  padding: 2px;
  user-select: none;
}

.vk-key:hover {
  background: var(--key-bg-hover);
  transform: translateY(-1px);
}

.vk-key:active {
  background: var(--key-bg-active);
  box-shadow: var(--key-shadow-active);
  transform: translateY(1px);
}

.vk-key.highlight {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-muted);
}

.vk-key-main {
  font-size: 16px;
  line-height: 1;
  color: var(--text-primary);
  transition: color var(--transition-theme);
}

.vk-key-shift {
  position: absolute;
  top: 3px;
  right: 4px;
  font-size: 9px;
  line-height: 1;
  color: var(--text-tertiary);
  transition: color var(--transition-theme);
}

.vk-key-sub {
  font-family: var(--font-ui);
  font-size: 8px;
  color: var(--text-tertiary);
  line-height: 1;
  margin-top: 1px;
  opacity: 0.6;
  transition: color var(--transition-theme);
}

.vk-key.wide {
  width: 80px;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
}

.vk-key.space {
  width: 340px;
  font-family: var(--font-ui);
  font-size: 11px;
  color: var(--text-tertiary);
}


/* ============================================================
   REFERENCE PANEL
   ============================================================ */
.reference-panel {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-panel);
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition:
    max-height var(--transition-slow),
    opacity var(--transition-base),
    background-color var(--transition-theme),
    border-color var(--transition-theme);
}

.reference-panel.visible {
  max-height: 480px;
  opacity: 1;
}

.reference-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 8px;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
  transition: border-color var(--transition-theme);
}

.reference-tabs::-webkit-scrollbar {
  display: none;
}

.reference-tab {
  padding: 10px 16px;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.reference-tab:hover {
  color: var(--text-secondary);
}

.reference-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.reference-content {
  padding: 16px;
  max-height: 400px;
  overflow-y: auto;
}

.reference-tab-content {
  display: none;
}

.reference-tab-content.active {
  display: block;
  animation: fade-in 200ms ease;
}

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

/* Reference grid for characters */
.char-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(56px, 1fr));
  gap: 6px;
}

.char-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 4px 6px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.char-cell:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

.char-cell-main {
  font-family: var(--font-assamese);
  font-size: 20px;
  line-height: 1.2;
  color: var(--text-primary);
}

.char-cell-sub {
  font-family: var(--font-ui);
  font-size: 9px;
  color: var(--text-tertiary);
  margin-top: 3px;
}

/* Conjunct table */
.conjunct-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.conjunct-table th {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 2px solid var(--border-medium);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.conjunct-table td {
  padding: 6px 12px;
  border-bottom: 1px solid var(--border-subtle);
  transition: border-color var(--transition-theme);
}

.conjunct-table td:first-child {
  font-family: var(--font-assamese);
  font-size: 18px;
}

.conjunct-table tr:hover td {
  background: var(--bg-surface-hover);
}

/* Shortcuts list */
.shortcut-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.shortcut-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.shortcut-item:hover {
  background: var(--bg-surface-hover);
}

.shortcut-desc {
  color: var(--text-secondary);
  font-size: 13px;
}

.shortcut-keys {
  display: flex;
  gap: 4px;
}

.kbd {
  display: inline-flex;
  align-items: center;
  padding: 2px 7px;
  background: var(--bg-surface-active);
  border: 1px solid var(--border-medium);
  border-radius: 4px;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  box-shadow: 0 1px 0 var(--border-strong);
  line-height: 1.4;
}


/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 0 20px;
  flex-shrink: 0;
  user-select: none;
}

.footer-text {
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 0.01em;
  transition: color var(--transition-theme);
}

.footer-text a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-text a:hover {
  color: var(--accent);
}


/* ============================================================
   TOOLTIP
   ============================================================ */
[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  top: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 10px;
  background: var(--text-primary);
  color: var(--text-inverse);
  font-size: 11px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: 200;
}

[data-tooltip]:hover::after {
  opacity: 1;
}


/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes pulse-save {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.saving-indicator {
  animation: pulse-save 1.5s ease-in-out infinite;
}


/* ============================================================
   RESPONSIVE (desktop-first adjustments)
   ============================================================ */
@media (max-width: 640px) {
  html {
    overflow-x: hidden;
  }

  .app {
    padding: 0 12px;
  }

  .header {
    gap: 8px;
  }

  .header-brand-text span {
    display: none;
  }

  .header-actions {
    gap: 2px;
    flex-shrink: 1;
    min-width: 0;
  }

  .mode-toggle {
    padding: 2px;
  }

  .mode-toggle-btn {
    padding: 4px 8px;
    font-size: 11px;
    gap: 3px;
  }

  .mode-toggle-btn .mode-icon {
    font-size: 12px;
  }

  .header-divider {
    margin: 0 2px;
    height: 16px;
  }

  .icon-btn {
    width: 30px;
    height: 30px;
  }

  .icon-btn svg {
    width: 16px;
    height: 16px;
  }

  .editor {
    padding: 24px 18px;
  }

  .toolbar {
    padding: 4px 2px;
    gap: 1px;
  }

  .toolbar-divider {
    margin: 0 3px;
  }

  .keyboard-panel.visible {
    padding: 12px 0;
  }

  .keyboard-grid {
    padding: 0 2px;
  }

  .keyboard-row {
    gap: 3px;
  }

  .vk-key {
    width: 30px;
    height: 36px;
  }

  .vk-key-main {
    font-size: 13px;
  }

  .vk-key-shift {
    font-size: 7px;
    top: 2px;
    right: 2px;
  }

  .vk-key-sub {
    font-size: 7px;
  }

  .vk-key.wide {
    width: 48px;
    font-size: 9px;
  }

  .vk-key.space {
    width: 140px;
    font-size: 10px;
  }

  .reference-content {
    padding: 12px;
  }

  .char-grid {
    grid-template-columns: repeat(auto-fill, minmax(46px, 1fr));
    gap: 4px;
  }

  .char-cell {
    padding: 6px 2px 4px;
  }

  .char-cell-main {
    font-size: 17px;
  }

  .status-bar {
    padding: 0 6px;
    font-size: 11px;
    gap: 10px;
  }
}


/* ============================================================
   PRINT
   ============================================================ */
@media print {
  .header,
  .toolbar,
  .status-bar,
  .keyboard-panel,
  .keyboard-toggle-bar,
  .reference-panel,
  .footer {
    display: none !important;
  }

  body {
    background: white !important;
    color: black !important;
  }

  .app {
    max-width: 100% !important;
    padding: 0 !important;
  }

  .editor-container {
    border: none !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    margin: 0 !important;
    background: white !important;
  }

  .editor-container::before {
    display: none !important;
  }

  .editor {
    padding: 0 !important;
    font-size: 14pt !important;
    min-height: auto !important;
    color: black !important;
  }

  .guide-overlay {
    display: none !important;
  }
}


/* ============================================================
   ONBOARDING GUIDE
   ============================================================ */
.guide-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.guide-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.guide-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(27, 25, 24, 0.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  transition: background-color var(--transition-theme);
}

html.dark-mode .guide-backdrop {
  background: rgba(0, 0, 0, 0.6);
}

.guide-modal {
  position: relative;
  width: 100%;
  max-width: 520px;
  max-height: calc(100vh - 48px);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(12px) scale(0.97);
  transition:
    transform var(--transition-slow),
    background-color var(--transition-theme),
    border-color var(--transition-theme),
    box-shadow var(--transition-theme);
}

.guide-overlay.visible .guide-modal {
  transform: translateY(0) scale(1);
}

/* Close button */
.guide-close {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  z-index: 1;
  transition: all var(--transition-fast);
}

.guide-close:hover {
  background: var(--bg-surface-active);
  color: var(--text-primary);
}

/* Body */
.guide-body {
  flex: 1;
  overflow-y: auto;
  padding: 28px 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.guide-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.guide-welcome {
  text-align: center;
  padding-bottom: 4px;
}

.guide-welcome-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 12px;
  background: var(--accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-assamese);
  font-size: 22px;
  font-weight: 700;
}

.guide-heading-as {
  font-family: var(--font-assamese);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  margin: 0 0 4px;
  transition: color var(--transition-theme);
}

.guide-subheading {
  font-family: var(--font-assamese);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  transition: color var(--transition-theme);
}

.guide-text-as {
  font-family: var(--font-assamese);
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
  transition: color var(--transition-theme);
}

.guide-text-as strong {
  color: var(--accent);
  font-weight: 600;
}

/* Mode cards */
.guide-modes {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.guide-mode-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-family: var(--font-assamese);
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
  transition:
    background-color var(--transition-theme),
    border-color var(--transition-theme),
    color var(--transition-theme);
}

.guide-mode-card strong {
  display: block;
  color: var(--text-primary);
  font-size: 14px;
  transition: color var(--transition-theme);
}

.guide-mode-desc {
  font-size: 13px;
  color: var(--text-tertiary);
  transition: color var(--transition-theme);
}

.guide-mode-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-assamese);
  font-size: 16px;
  font-weight: 600;
  transition: background-color var(--transition-theme), color var(--transition-theme);
}

/* Example rows */
.guide-example {
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition:
    background-color var(--transition-theme),
    border-color var(--transition-theme);
}

.guide-example-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.guide-input {
  font-family: var(--font-ui);
  font-size: 14px;
  color: var(--text-tertiary);
  background: var(--bg-surface);
  padding: 3px 10px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-subtle);
  font-style: italic;
  letter-spacing: 0.02em;
  transition:
    background-color var(--transition-theme),
    border-color var(--transition-theme),
    color var(--transition-theme);
}

.guide-arrow {
  color: var(--accent);
  font-size: 16px;
  flex-shrink: 0;
}

.guide-output {
  font-family: var(--font-assamese);
  font-size: 18px;
  color: var(--text-primary);
  font-weight: 600;
  transition: color var(--transition-theme);
}

/* Hints */
.guide-hint {
  font-family: var(--font-assamese);
  font-size: 13px;
  color: var(--text-tertiary);
  line-height: 1.6;
  margin: 0;
  transition: color var(--transition-theme);
}

.guide-hint .kbd {
  vertical-align: baseline;
  margin: 0 1px;
}

/* Tips list */
.guide-tip-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: var(--font-assamese);
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  transition: color var(--transition-theme);
}

.guide-tip-list li {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.guide-tip-list .kbd {
  flex-shrink: 0;
}

/* Footer */
.guide-footer {
  padding: 0 24px 24px;
  display: flex;
  justify-content: center;
  flex-shrink: 0;
}

.guide-start-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 10px 24px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-assamese);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.guide-start-btn:hover {
  background: var(--accent-hover);
}

.guide-start-btn:active {
  transform: scale(0.98);
}

/* Mobile */
@media (max-width: 640px) {
  .guide-overlay {
    padding: 12px;
  }

  .guide-modal {
    max-width: 100%;
  }

  .guide-body {
    padding: 20px 16px 16px;
    gap: 16px;
  }

  .guide-heading-as {
    font-size: 19px;
  }

  .guide-text-as {
    font-size: 14px;
  }

  .guide-footer {
    padding: 0 16px 16px;
  }
}