/*
 * File: style.css
 * Project: UniCal Math Studio
 * Purpose: Responsive application layout, mathematical workspace,
 *          collapsible sidebar, themes, and smart keyboard styles.
 * Gate: A — Application Foundation
 */

/* ============================================
   1. DESIGN TOKENS
============================================ */

:root {
  color-scheme: light;

  --font-ui: Inter, "Segoe UI", Arial, sans-serif;

  --color-bg: #f4f6fb;
  --color-surface: #ffffff;
  --color-surface-soft: #f8f9fd;

  --color-text: #192640;
  --color-muted: #75839b;
  --color-border: #e1e7f1;

  --color-primary: #6858ed;
  --color-primary-hover: #5947da;
  --color-primary-soft: #efedff;

  --color-accent: #00a79a;
  --color-accent-soft: #e9f9f5;

  --color-sidebar: #151f34;
  --color-sidebar-hover: #283750;
  --color-sidebar-active: #363968;
  --color-sidebar-text: #b8c6dc;

  --color-shift: #ef9d21;
  --color-shift-soft: #fff0d1;
  --color-shift-dark: #855000;

  --color-second: #149c66;
  --color-second-soft: #dcf8ea;
  --color-second-dark: #086b46;

  --color-error: #df4b56;
  --color-warning: #d28c17;

  --shadow-panel: 0 8px 24px rgba(28, 45, 78, 0.035);

  --sidebar-width: 248px;
  --header-height: 62px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
}


/* ============================================
   2. DARK THEME
============================================ */

.app-shell[data-theme="dark"] {
  color-scheme: dark;

  --color-bg: #101828;
  --color-surface: #1b2940;
  --color-surface-soft: #22314b;

  --color-text: #eef3fc;
  --color-muted: #a1aec4;
  --color-border: #35445d;

  --color-primary: #9c90ff;
  --color-primary-hover: #b0a6ff;
  --color-primary-soft: #35365c;

  --color-accent: #58d8c6;
  --color-accent-soft: #19483f;

  --color-shift-soft: #60461e;
  --color-shift-dark: #ffcf72;

  --color-second-soft: #184e38;
  --color-second-dark: #83e4af;

  --shadow-panel: none;
}


/* ============================================
   3. GLOBAL RESET
============================================ */

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

html {
  font-family: var(--font-ui);
  font-size: 14px;
}

body {
  margin: 0;
  min-width: 320px;
  overflow: hidden;
}

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

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

button:focus-visible,
input:focus-visible,
a:focus-visible,
math-field:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}

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

h1,
h2,
h3,
p {
  margin-top: 0;
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 14px;
  z-index: 200;
  padding: 12px;
  background: white;
  color: #18233d;
  border-radius: 8px;
}

.skip-link:focus {
  top: 10px;
}


/* ============================================
   4. APPLICATION SHELL
============================================ */

.app-shell {
  width: 100%;
  height: 100vh;
  height: 100dvh;

  display: grid;
  grid-template-rows: var(--header-height) minmax(0, 1fr);

  background: var(--color-bg);
  color: var(--color-text);

  overflow: hidden;
}

.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 0;
}

.app-shell.sidebar-collapsed {
  --sidebar-width: 74px;
}


/* ============================================
   5. GLOBAL HEADER
============================================ */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;

  min-width: 0;
  padding: 0 20px;

  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.topbar-left,
.topbar-right {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-symbol {
  width: 38px;
  height: 38px;

  display: grid;
  place-items: center;

  border-radius: 11px;

  background: linear-gradient(
    135deg,
    #7867fa,
    #00b8a7
  );

  color: white;
  font-family: Georgia, serif;
  font-size: 27px;
  font-weight: bold;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-text strong {
  font-size: 20px;
  letter-spacing: -0.7px;
}

.brand-text strong span {
  color: var(--color-primary);
}

.brand-text small {
  margin-top: 3px;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 1.6px;
  color: var(--color-muted);
}

.header-divider {
  height: 27px;
  width: 1px;
  background: var(--color-border);
}

.header-location {
  display: flex;
  align-items: center;
  gap: 9px;

  min-width: 0;
  font-size: 12px;
  color: var(--color-muted);
}

.header-location strong {
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.location-separator {
  color: var(--color-primary);
}

.icon-button {
  display: grid;
  place-items: center;

  min-width: 36px;
  height: 36px;

  border: 1px solid var(--color-border);
  border-radius: 9px;

  background: var(--color-surface-soft);
  color: var(--color-text);

  font-size: 18px;
}

.icon-button:hover {
  background: var(--color-primary-soft);
}

.mobile-menu-button {
  display: none;
}

.connection-indicator {
  display: inline-flex;
  align-items: center;
  gap: 7px;

  color: var(--color-muted);
  font-size: 11px;
  white-space: nowrap;
}

.connection-dot {
  width: 8px;
  height: 8px;

  border-radius: 50%;
  background: #1ba879;
}

.connection-indicator.is-offline .connection-dot {
  background: var(--color-error);
}


/* ============================================
   6. SIDEBAR
============================================ */

.sidebar {
  display: flex;
  flex-direction: column;

  min-height: 0;
  overflow: hidden;

  background: var(--color-sidebar);
  color: var(--color-sidebar-text);

  border-right: 1px solid #2a3650;
}

.sidebar-header {
  height: 54px;
  min-height: 54px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  padding: 0 14px;
}

.sidebar-heading {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: #94a7c6;
}

.sidebar-collapse-button {
  width: 29px;
  height: 29px;

  border: 1px solid #3a4964;
  border-radius: 7px;

  background: #273650;
  color: #e2eaff;

  font-size: 20px;
  line-height: 1;
}

.sidebar-collapse-button:hover {
  background: #384b6c;
}

.sidebar-search {
  position: relative;

  margin: 0 11px 14px;
}

.sidebar-search input {
  width: 100%;
  height: 37px;

  padding: 0 12px 0 34px;

  background: #24334d;
  color: #ffffff;

  border: 1px solid #3b4a65;
  border-radius: 9px;

  outline: none;
}

.sidebar-search input::placeholder {
  color: #99a8c2;
}

.sidebar-search input:focus {
  border-color: #9d91ff;
}

.sidebar-search-icon {
  position: absolute;
  left: 11px;
  top: 7px;

  font-size: 20px;
  color: #a0b0cb;
}

.workspace-navigation {
  flex: 1;
  min-height: 0;
  overflow-y: auto;

  padding: 0 9px 15px;

  scrollbar-width: thin;
  scrollbar-color: #465570 transparent;
}

.nav-group {
  margin-bottom: 14px;
}

.nav-group-label {
  padding: 10px 10px 7px;

  font-size: 9px;
  font-weight: 800;
  letter-spacing: 1.3px;

  color: #7f93b2;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 11px;

  width: 100%;
  min-height: 38px;

  padding: 7px 10px;
  margin-bottom: 3px;

  border: 1px solid transparent;
  border-radius: 9px;

  background: transparent;
  color: var(--color-sidebar-text);

  font-size: 12px;
  font-weight: 550;

  transition:
    background 0.15s ease,
    color 0.15s ease;
}

.nav-link:hover {
  background: var(--color-sidebar-hover);
  color: white;
}

.nav-link.active {
  background: var(--color-sidebar-active);
  border-color: #56548a;
  color: white;
}

.nav-link .nav-icon {
  width: 25px;
  min-width: 25px;
  height: 25px;

  display: grid;
  place-items: center;

  border-radius: 7px;

  background: #293d58;
  color: #a6e9e2;

  font-family: Georgia, serif;
  font-size: 15px;
  font-weight: 700;
}

.nav-link.active .nav-icon {
  background: var(--color-primary);
  color: white;
}

.nav-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-loading,
.sidebar-empty {
  padding: 15px;
  color: #a6b5ce;
  font-size: 12px;
  line-height: 1.5;
}

.sidebar-footer {
  display: flex;
  align-items: center;
  gap: 10px;

  padding: 13px;
  border-top: 1px solid #31405a;
}

.sidebar-footer-icon {
  width: 32px;
  height: 32px;

  display: grid;
  place-items: center;

  flex-shrink: 0;

  border-radius: 9px;
  background: #33365d;
  color: #b9b1ff;
}

.sidebar-footer-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  white-space: nowrap;
}

.sidebar-footer-text strong {
  color: #f1f5ff;
  font-size: 11px;
}

.sidebar-footer-text small {
  font-size: 10px;
  color: #9eafc9;
}

.sidebar-backdrop {
  display: none;
}


/* ============================================
   7. COLLAPSED SIDEBAR
============================================ */

.sidebar-collapsed .sidebar-heading,
.sidebar-collapsed .sidebar-search,
.sidebar-collapsed .nav-group-label,
.sidebar-collapsed .nav-text,
.sidebar-collapsed .sidebar-footer-text {
  display: none;
}

.sidebar-collapsed .sidebar-header {
  justify-content: center;
  padding: 0;
}

.sidebar-collapsed .nav-link {
  justify-content: center;
  padding: 7px 4px;
}

.sidebar-collapsed .nav-link .nav-icon {
  margin: 0;
}

.sidebar-collapsed .sidebar-footer {
  justify-content: center;
}


/* ============================================
   8. MAIN WORKSPACE
============================================ */

.main-content {
  min-width: 0;
  min-height: 0;

  overflow-y: auto;
  overflow-x: hidden;

  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.workspace-container {
  width: 100%;
  max-width: 1880px;
  margin: 0 auto;

  padding: 22px;
}

.workspace-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;

  margin-bottom: 19px;
}

.workspace-heading-copy {
  min-width: 0;
}

.eyebrow {
  margin-bottom: 8px;

  color: var(--color-primary);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1.5px;
}

.workspace-heading h1 {
  margin-bottom: 6px;

  font-size: clamp(23px, 2.2vw, 32px);
  font-weight: 800;
  letter-spacing: -0.8px;
}

.workspace-heading p {
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 12px;
  line-height: 1.6;
}

.stage-label {
  display: inline-flex;
  align-items: center;

  padding: 7px 11px;

  border: 1px solid #d9d1ff;
  border-radius: 20px;

  background: var(--color-primary-soft);
  color: var(--color-primary);

  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.5px;

  white-space: nowrap;
}

.workspace-grid {
  display: grid;

  grid-template-columns:
    minmax(0, 1fr)
    minmax(265px, 310px);

  align-items: start;
  gap: 17px;
}

.workspace-primary,
.workspace-inspector {
  display: flex;
  flex-direction: column;
  gap: 14px;

  min-width: 0;
}


/* ============================================
   9. GENERAL STUDIO PANELS
============================================ */

.studio-panel {
  min-width: 0;

  padding: 15px;

  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);

  box-shadow: var(--shadow-panel);
}

.panel-heading,
.keyboard-panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.panel-heading-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.panel-icon {
  width: 35px;
  height: 35px;

  display: grid;
  place-items: center;

  flex-shrink: 0;

  background: var(--color-primary-soft);
  color: var(--color-primary);

  border-radius: 10px;

  font-family: Georgia, serif;
  font-size: 19px;
  font-weight: 800;
}

.studio-panel h2 {
  margin: 0;
  font-size: 13px;
  font-weight: 800;
}

.panel-subtitle {
  margin: 4px 0 0;

  color: var(--color-muted);
  font-size: 10px;
}

.live-math-label {
  color: var(--color-accent);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.8px;

  white-space: nowrap;
}


/* ============================================
   10. DIRECT MATHEMATICAL WRITING SCREEN
============================================ */

.math-writing-surface {
  display: flex;
  flex-direction: column;

  min-height: clamp(150px, 22vh, 270px);

  margin-top: 13px;
  padding: 14px;

  overflow: auto;

  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.unical-math-field {
  display: block;
  flex: 1;

  width: 100%;
  min-height: 125px;

  padding: 10px 4px;

  background: transparent;
  color: var(--color-text);

  border: 0;
  outline: none;

  font-size: clamp(23px, 2.2vw, 34px);
  line-height: 1.55;

  overflow: auto;
  overflow-wrap: anywhere;
}

.unical-math-field:focus-within {
  outline: none;
}

/* UniCal will supply its own mathematical keyboard. */

math-field::part(virtual-keyboard-toggle) {
  display: none;
}

.math-writing-surface:focus-within {
  border-color: var(--color-primary);

  box-shadow:
    0 0 0 3px
    color-mix(
      in srgb,
      var(--color-primary) 12%,
      transparent
    );
}

.math-editor-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;

  margin-top: 12px;
}

.editor-status {
  color: var(--color-muted);
  font-size: 10px;
  line-height: 1.5;
}

.editor-actions {
  display: flex;
  align-items: center;
  gap: 7px;
}

.subtle-button {
  padding: 8px 13px;

  border: 1px solid var(--color-border);
  border-radius: 8px;

  background: var(--color-surface-soft);
  color: var(--color-text);

  font-size: 11px;
  font-weight: 700;
}

.subtle-button:hover:not(:disabled) {
  background: var(--color-primary-soft);
}


/* ============================================
   11. COMPUTATION OPERATION BAR
============================================ */

.operation-panel {
  padding: 12px 14px;
}

.operation-panel-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.operation-panel-info {
  min-width: 0;
}

.operation-panel-info p {
  margin: 5px 0 0;

  color: var(--color-muted);
  font-size: 10px;
  line-height: 1.5;
}

.primary-button {
  min-height: 38px;
  padding: 9px 17px;

  border: 0;
  border-radius: 9px;

  background: var(--color-primary);
  color: white;

  font-size: 12px;
  font-weight: 800;

  white-space: nowrap;
}

.primary-button:hover:not(:disabled) {
  background: var(--color-primary-hover);
}


/* ============================================
   12. ADVANCED KEYBOARD
============================================ */

.keyboard-panel {
  padding: 13px;
}

.keyboard-panel-heading {
  margin-bottom: 12px;
}

.keyboard-layer-indicator {
  font-size: 10px;
  font-weight: 800;
  color: var(--color-muted);
  white-space: nowrap;
}

.keyboard-tabs {
  display: flex;
  align-items: center;
  gap: 5px;

  min-width: 0;
  overflow-x: auto;

  padding-bottom: 8px;
  scrollbar-width: thin;
}

.keyboard-tab {
  flex: 0 0 auto;

  padding: 8px 11px;

  border: 1px solid transparent;
  border-radius: 9px;

  background: transparent;
  color: var(--color-muted);

  font-size: 11px;
  font-weight: 700;

  white-space: nowrap;
}

.keyboard-tab:hover {
  background: var(--color-surface-soft);
}

.keyboard-tab.active {
  background: var(--color-primary-soft);
  color: var(--color-primary);
  border-color: var(--color-border);
}

.template-toolbar {
  display: flex;
  gap: 6px;

  flex-wrap: wrap;

  padding: 8px 0;
}

.template-button {
  min-height: 31px;
  padding: 6px 10px;

  background: var(--color-surface-soft);
  color: var(--color-text);

  border: 1px solid var(--color-border);
  border-radius: 7px;

  font-size: 10px;
  font-weight: 700;
}

.template-button:hover {
  background: var(--color-primary-soft);
}

.keyboard-keys {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 5px;

  min-width: 0;
}

.keyboard-pending {
  grid-column: 1 / -1;

  margin: 0;
  padding: 26px 15px;

  border: 1px dashed var(--color-border);
  border-radius: 10px;

  text-align: center;
  color: var(--color-muted);

  font-size: 11px;
  line-height: 1.6;
}

.math-key {
  position: relative;

  min-width: 0;
  min-height: 41px;

  display: flex;
  align-items: center;
  justify-content: center;

  padding: 4px;

  background: var(--color-primary-soft);
  color: var(--color-primary);

  border: 1px solid var(--color-border);
  border-radius: 8px;

  font-family: Georgia, serif;
  font-size: 16px;
  font-weight: 650;

  transition:
    background 0.12s ease,
    transform 0.12s ease;
}

.math-key:hover:not(:disabled) {
  filter: brightness(0.97);
}

.math-key:active:not(:disabled) {
  transform: translateY(1px);
}

.math-key.numeric {
  background: var(--color-surface);
  color: var(--color-text);

  font-family: var(--font-ui);
  font-size: 14px;
}

.math-key.utility {
  background: var(--color-surface-soft);
  color: var(--color-text);
}

.math-key.key-equals {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.math-key.key-shift {
  background: #e7eef9;
  color: #385a8e;
}

.math-key.key-second {
  background: #e7eef9;
  color: #385a8e;
}


/* ============================================
   13. SHIFT — AMBER FUNCTION LAYER
============================================ */

.keyboard-panel[data-layer="shift"] .math-key.function-key,
.keyboard-panel[data-layer="shift"] .math-key.key-shift {
  background: var(--color-shift-soft);
  color: var(--color-shift-dark);
  border-color: var(--color-shift);
}

.keyboard-panel[data-layer="shift"] .keyboard-layer-indicator {
  color: var(--color-shift-dark);
}


/* ============================================
   14. SECOND FUNCTION — GREEN LAYER
============================================ */

.keyboard-panel[data-layer="second"] .math-key.function-key,
.keyboard-panel[data-layer="second"] .math-key.key-second {
  background: var(--color-second-soft);
  color: var(--color-second-dark);
  border-color: var(--color-second);
}

.keyboard-panel[data-layer="second"] .keyboard-layer-indicator {
  color: var(--color-second-dark);
}


/* ============================================
   15. KEYBOARD FOOTER
============================================ */

.keyboard-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;

  margin-top: 10px;

  color: var(--color-muted);
  font-size: 10px;
  line-height: 1.5;
}


/* ============================================
   16. INSPECTOR / SPECIALIST PANELS
============================================ */

.inspector-panel {
  padding: 15px;
}

.inspector-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;

  margin-bottom: 10px;
}

.inspector-icon {
  color: var(--color-primary);
  font-size: 19px;
}

.inspector-description {
  color: var(--color-muted);
  font-size: 11px;
  line-height: 1.6;
}

.operation-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.operation-button {
  min-height: 33px;
  padding: 7px 10px;

  border: 1px solid var(--color-border);
  border-radius: 8px;

  background: var(--color-surface-soft);
  color: var(--color-muted);

  font-size: 11px;
  font-weight: 700;
}

.operation-button:hover {
  background: var(--color-primary-soft);
}

.operation-button.selected {
  background: var(--color-primary-soft);
  color: var(--color-primary);

  border-color: var(--color-primary);
}

.result-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;

  min-height: 165px;
  padding: 16px;

  text-align: center;
  border-radius: 11px;

  background: var(--color-surface-soft);
}

.result-empty-icon {
  font-family: Georgia, serif;
  font-size: 37px;

  color: var(--color-primary);

  margin-bottom: 10px;
}

.result-content strong {
  font-size: 12px;
}

.result-content p {
  margin: 7px 0 0;

  color: var(--color-muted);
  font-size: 11px;
  line-height: 1.6;
}

.specialist-content {
  padding: 12px;

  color: var(--color-muted);
  background: var(--color-surface-soft);

  border-radius: 10px;

  font-size: 11px;
  line-height: 1.7;
}


/* ============================================
   17. STATUS TOAST
============================================ */

.app-toast {
  position: fixed;
  right: 20px;
  bottom: 20px;

  z-index: 100;

  max-width: min(350px, calc(100vw - 40px));

  padding: 11px 15px;

  background: var(--color-sidebar);
  color: white;

  border-radius: 10px;
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.15);

  font-size: 12px;

  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);

  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
}

.app-toast.visible {
  opacity: 1;
  transform: translateY(0);
}


/* ============================================
   18. LAPTOP / SMALL DESKTOP
============================================ */

@media (max-width: 1180px) {

  .workspace-container {
    padding: 16px;
  }

  .workspace-grid {
    grid-template-columns: minmax(0, 1fr) 255px;
    gap: 12px;
  }

  .studio-panel {
    padding: 12px;
  }

  .math-key {
    min-height: 37px;
    font-size: 14px;
  }

}


/* ============================================
   19. TABLETS
============================================ */

@media (max-width: 980px) {

  .workspace-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .workspace-inspector {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .workspace-inspector > :last-child {
    grid-column: 1 / -1;
  }

  .math-writing-surface {
    min-height: 160px;
  }

}


/* ============================================
   20. MOBILE NAVIGATION
============================================ */

@media (max-width: 760px) {

  .app-layout,
  .app-shell.sidebar-collapsed .app-layout {
    display: block;
  }

  .topbar {
    padding: 0 12px;
  }

  .mobile-menu-button {
    display: grid;
  }

  .header-divider,
  .header-location,
  .connection-indicator {
    display: none;
  }

  .sidebar {
    position: fixed;
    top: var(--header-height);
    bottom: 0;
    left: 0;

    z-index: 70;

    width: min(285px, calc(100vw - 45px));

    transform: translateX(-105%);
    transition: transform 0.2s ease;
  }

  .app-shell.mobile-sidebar-open .sidebar {
    transform: translateX(0);
  }

  .sidebar-backdrop {
    position: fixed;
    inset: var(--header-height) 0 0;

    z-index: 60;
    display: none;

    width: 100%;

    border: 0;
    background: rgba(8, 15, 30, 0.55);
  }

  .app-shell.mobile-sidebar-open .sidebar-backdrop {
    display: block;
  }

  .sidebar-collapsed .sidebar-heading,
  .sidebar-collapsed .sidebar-search,
  .sidebar-collapsed .nav-group-label,
  .sidebar-collapsed .nav-text,
  .sidebar-collapsed .sidebar-footer-text {
    display: revert;
  }

  .sidebar-collapsed .sidebar-header {
    justify-content: space-between;
    padding: 0 14px;
  }

  .sidebar-collapsed .nav-link {
    justify-content: flex-start;
    padding: 7px 10px;
  }

  .sidebar-collapsed .sidebar-footer {
    justify-content: flex-start;
  }

  .main-content {
    height: 100%;
  }

  .workspace-container {
    padding: 13px;
  }

  .workspace-heading {
    margin-bottom: 13px;
  }

  .workspace-heading h1 {
    font-size: 23px;
  }

  .workspace-inspector {
    grid-template-columns: minmax(0, 1fr);
  }

  .workspace-inspector > :last-child {
    grid-column: auto;
  }

  .math-writing-surface {
    min-height: 145px;
    padding: 10px;
  }

  .unical-math-field {
    font-size: 24px;
  }

  .math-key {
    min-height: 39px;
    font-size: 13px;
    border-radius: 6px;
  }

  .keyboard-keys {
    gap: 4px;
  }

  .keyboard-footer {
    font-size: 9px;
  }

}


/* ============================================
   21. SMALL PHONES
============================================ */

@media (max-width: 400px) {

  .brand-text strong {
    font-size: 18px;
  }

  .brand-text small {
    font-size: 8px;
  }

  .workspace-container {
    padding: 9px;
  }

  .studio-panel {
    padding: 10px;
    border-radius: 12px;
  }

  .live-math-label {
    font-size: 8px;
  }

  .math-writing-surface {
    padding: 8px;
  }

  .keyboard-keys {
    gap: 3px;
  }

  .math-key {
    min-height: 37px;
    padding: 2px;
    font-size: 12px;
  }

}


/* ============================================
   22. ACCESSIBILITY
============================================ */

@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

}


/*
 * File: style.css — Gate B UI additions.
 * Purpose: Responsive calculation options, live results,
 *          errors, and compact result-first tablet/mobile flow.
 *
 * Append below the existing Gate A stylesheet.
 */


/* ============================================
   1. COMPUTATION OPTIONS
============================================ */

.calculation-options {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;

  min-width: 0;
  flex-wrap: wrap;
  margin-left: auto;
}

.calculation-label {
  display: grid;
  gap: 4px;

  color: var(--color-muted);
  font-size: 10px;
  font-weight: 700;
}

.calculation-label select {
  height: 35px;
  max-width: 130px;

  border: 1px solid var(--color-border);
  border-radius: 8px;

  background: var(--color-surface-soft);
  color: var(--color-text);

  padding: 0 7px;
  font-size: 11px;
}

.operation-panel-inner {
  flex-wrap: wrap;
}

.operation-panel .primary-button {
  align-self: flex-end;
  min-width: 99px;
}

.operation-button.coming-soon {
  opacity: 0.50;
  cursor: not-allowed;
}


/* ============================================
   2. MATH API RECONNECT BUTTON
============================================ */

.api-retry-button {
  width: 28px;
  height: 28px;
  padding: 0;

  border: 1px solid var(--color-border);
  border-radius: 8px;

  background: var(--color-surface-soft);
  color: var(--color-text);

  font-size: 18px;
}

.api-retry-button:hover {
  background: var(--color-primary-soft);
}


/* ============================================
   3. MATHEMATICAL RESULT PANEL
============================================ */

.result-content.has-result {
  align-items: stretch;
  justify-content: flex-start;
  gap: 10px;

  min-height: 130px;

  text-align: left;
  overflow-wrap: anywhere;
}

.result-heading {
  font-size: 13px;
}

.result-field-label {
  font-size: 10px;
  color: var(--color-muted);

  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.045em;
}


/* ============================================
   4. PROPER MATHEMATICAL RENDERING
============================================ */

.result-math-field {
  display: block;

  width: 100%;
  min-height: 60px;

  padding: 14px 8px;

  background: var(--color-surface);
  color: var(--color-text);

  border: 1px solid var(--color-border);
  border-radius: 10px;

  font-size: clamp(22px, 2vw, 30px);

  overflow-x: auto;
  pointer-events: none;
}

.result-approximation,
.result-plain {
  font-family:
    ui-monospace,
    Consolas,
    monospace;

  font-size: 13px;
  color: var(--color-text);

  word-break: break-word;
  line-height: 1.65;
}


/* ============================================
   5. MATHEMATICAL WARNINGS
============================================ */

.result-warning {
  margin: 0;
  padding: 9px 11px;

  border-left: 3px solid #d59b25;

  background: var(--color-surface);
  color: var(--color-text);

  font-size: 11px;
  line-height: 1.55;
}


/* ============================================
   6. ERROR MESSAGES
============================================ */

.result-error .result-heading {
  color: var(--color-error);
}

.result-error-message {
  color: var(--color-text);
}

.result-error-code {
  align-self: flex-start;

  padding: 4px 7px;

  color: var(--color-error);

  border: 1px solid var(--color-border);
  border-radius: 6px;

  font: 11px
    ui-monospace,
    Consolas,
    monospace;
}


/* ============================================
   7. LOADING AND COPY ACTIONS
============================================ */

.result-loading {
  opacity: 0.75;
}

.result-copy {
  align-self: flex-start;
}


/* ============================================
   8. SMALL DESKTOP / LAPTOP
============================================ */

@media (max-width: 1100px) {

  .calculation-options {
    order: 3;
    width: 100%;
    justify-content: flex-start;
  }

  .operation-panel .primary-button {
    margin-left: auto;
  }

}


/* ============================================
   9. TABLET — RESULT BEFORE KEYBOARD
============================================ */

@media (max-width: 980px) {

  /*
   * Put the result immediately below the writing
   * and operation area, before the long keyboard.
   *
   * No index.html changes are needed.
   */

  .workspace-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .workspace-grid > .workspace-primary,
  .workspace-grid > .workspace-inspector {
    display: contents;
  }

  .math-editor-panel {
    order: 1;
  }

  .operation-panel {
    order: 2;
  }

  .result-panel {
    order: 3;
  }

  .keyboard-panel {
    order: 4;
  }

  .workspace-inspector > :not(.result-panel) {
    order: 5;
  }

}


/* ============================================
   10. SMALL PHONES
============================================ */

@media (max-width: 440px) {

  .operation-panel-inner {
    align-items: stretch;
  }

  .calculation-options {
    gap: 6px;
  }

  .calculation-label {
    flex: 1;
  }

  .calculation-label select {
    width: 100%;
    max-width: none;
  }

  .operation-panel .primary-button {
    width: 100%;
  }

  .result-math-field {
    font-size: 21px;
  }

}


/*
 * File: style.css — Gate B live-preview additions.
 * Purpose: Compact optional live-numeric toggle and readable real-time
 *          result states. Append after the existing Gate B rules.
 */

/* Align the live-preview preference with domain and precision controls. */

.calculation-options {
  align-items: end;
  row-gap: 8px;
}

.live-preview-option {
  display: inline-flex;
  align-items: center;
  gap: 7px;

  min-height: 35px;
  padding: 5px 10px;

  border: 1px solid var(--color-border);
  border-radius: 9px;

  background: var(--color-surface-soft);
  color: var(--color-text);

  font-size: 11px;
  font-weight: 700;

  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

.live-preview-option input {
  accent-color: var(--color-primary);

  width: 15px;
  height: 15px;
  margin: 0;

  cursor: pointer;
}

.live-preview-option:focus-within {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.result-success .result-heading {
  color: var(--color-primary);
}

.result-notice .result-heading {
  color: var(--color-muted);
}

.result-notice .result-error-message {
  color: var(--color-muted);
}

.result-loading .result-heading::after {
  content: "";

  display: inline-block;
  width: 10px;
  height: 10px;

  margin-left: 9px;

  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);

  border-radius: 50%;

  animation: unical-wait 0.75s linear infinite;
}

@keyframes unical-wait {
  to {
    transform: rotate(360deg);
  }
}

.result-math-field {
  max-width: 100%;
}

@media (max-width: 600px) {
  .calculation-options {
    justify-content: stretch;
  }

  .live-preview-option {
    flex: 1 1 100%;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .result-loading .result-heading::after {
    animation: none;
  }
}