/* =========================================================
   Kalsanah / ClassPad X - Professional Responsive Layout
   Final override: desktop-first polish with tablet and phone breakpoints
   ========================================================= */

:root {
  --cp-page-max: 1440px;
  --cp-desktop-keypad: clamp(360px, 31vw, 470px);
  --cp-sidebar-desktop: 96px;
  --cp-sidebar-tablet: 78px;
  --cp-gap: clamp(10px, 1vw, 16px);
  --cp-panel-radius: 20px;
  --cp-ui-border: rgba(56, 189, 248, 0.16);
  --cp-ui-border-strong: rgba(56, 189, 248, 0.36);
  --cp-ui-surface: rgba(2, 6, 23, 0.88);
  --cp-ui-surface-2: rgba(15, 23, 42, 0.86);
}

html {
  min-height: 100%;
  height: 100%;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-height: 100dvh;
  height: auto;
  margin: 0;
  padding: clamp(12px, 2vw, 24px);
  align-items: stretch;
  justify-content: center;
  overflow-x: hidden;
  overflow-y: auto;
  background:
    radial-gradient(circle at 12% 0%, rgba(14, 165, 233, 0.18), transparent 34%),
    radial-gradient(circle at 88% 8%, rgba(37, 99, 235, 0.16), transparent 34%),
    linear-gradient(135deg, #020617 0%, #08111f 45%, #020617 100%);
}

body,
button,
input,
select,
textarea {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

button,
input,
select,
textarea {
  max-width: 100%;
}

button {
  touch-action: manipulation;
}

/* Remove calculator toy-shell constraints on professional layouts. */
.cp-device-shell,
.cp-device-frame,
.cp-device-bezel,
.cp-device-screen {
  width: 100%;
  max-width: var(--cp-page-max);
  min-width: 0;
}

.cp-device-shell {
  min-height: calc(100dvh - clamp(24px, 4vw, 48px));
  display: flex;
  align-items: stretch;
  justify-content: center;
}

.cp-device-frame,
.cp-device-bezel,
.cp-device-screen {
  margin: 0;
  padding: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.cp-device-frame::before,
.cp-device-brand,
.cp-device-bottom {
  display: none !important;
}

.cp-app {
  width: 100%;
  min-height: calc(100dvh - clamp(24px, 4vw, 48px));
  height: auto;
  display: flex;
  flex-direction: column;
  gap: var(--cp-gap);
  padding: clamp(12px, 1.4vw, 20px);
  border: 1px solid var(--cp-ui-border);
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(15, 23, 42, 0.95), rgba(2, 6, 23, 0.96)),
    radial-gradient(circle at top left, rgba(14, 165, 233, 0.14), transparent 40%);
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  overflow: hidden;
}

.cp-header {
  flex: 0 0 auto;
  display: grid;
  grid-template-columns: minmax(170px, 1fr) auto minmax(92px, 1fr);
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  border: 1px solid var(--cp-ui-border);
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.92), rgba(2, 6, 23, 0.9));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.cp-header-left,
.cp-header-center,
.cp-header-right {
  min-width: 0;
}

.cp-brand-title {
  font-size: clamp(16px, 1.4vw, 22px);
  letter-spacing: 0.08em;
}

.cp-brand-subtitle {
  margin-top: 2px;
  font-size: clamp(11px, 0.85vw, 13px);
}

.cp-header-mode-indicators {
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}

.cp-indicator,
.cp-display-status-item,
.cp-display-status-value {
  min-width: auto;
  padding: 4px 9px;
  border-color: rgba(148, 163, 184, 0.24);
  background: rgba(2, 6, 23, 0.62);
  font-size: 11px;
  line-height: 1.2;
}

.cp-header-right {
  justify-self: end;
}

.cp-header-btn {
  width: 36px;
  height: 36px;
}

.cp-main {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: var(--cp-sidebar-desktop) minmax(0, 1fr);
  gap: var(--cp-gap);
}

.cp-tabs {
  min-height: 0;
  overflow-y: auto;
  gap: 7px;
  padding: 10px;
  border: 1px solid var(--cp-ui-border);
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.78), rgba(2, 6, 23, 0.78));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
  scrollbar-width: thin;
}

.cp-tab-btn {
  min-height: 62px;
  border-radius: 18px;
  padding: 8px 6px;
  border: 1px solid transparent;
  background: rgba(15, 23, 42, 0.45);
  color: #b6c3d6;
}

.cp-tab-btn:hover {
  border-color: rgba(56, 189, 248, 0.24);
  background: rgba(15, 23, 42, 0.78);
}

.cp-tab-btn .cp-tab-icon {
  font-size: 21px;
  line-height: 1;
}

.cp-tab-btn .cp-tab-label {
  font-size: 11px;
  letter-spacing: 0.04em;
}

.cp-tab-btn.is-active {
  border-color: rgba(56, 189, 248, 0.55);
  background: linear-gradient(180deg, rgba(14, 165, 233, 0.94), rgba(3, 105, 161, 0.9));
  color: #f8fafc;
  box-shadow: 0 12px 24px rgba(14, 165, 233, 0.22);
}

.cp-content {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--cp-desktop-keypad);
  grid-template-rows: auto minmax(0, 1fr);
  gap: var(--cp-gap);
  padding: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  overflow: hidden;
}

.cp-display,
.cp-workspace,
.cp-keypad {
  min-width: 0;
  border: 1px solid var(--cp-ui-border);
  border-radius: var(--cp-panel-radius);
  background: linear-gradient(180deg, var(--cp-ui-surface-2), var(--cp-ui-surface));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.035), 0 16px 42px rgba(0, 0, 0, 0.18);
}

.cp-display {
  grid-column: 1;
  grid-row: 1;
  min-height: 182px;
  padding: 14px;
}

.cp-display-history {
  min-height: 92px;
  font-size: 13px;
  border-color: rgba(148, 163, 184, 0.16);
}

.cp-display-expression-row,
.cp-display-result-row,
.cp-display-message-row {
  font-size: 13px;
}

.cp-display-result-value {
  font-size: clamp(18px, 1.6vw, 26px);
}

.cp-workspace {
  grid-column: 1;
  grid-row: 2;
  min-height: 0;
  padding: 14px;
  overflow: hidden;
}

.cp-keypad {
  grid-column: 2;
  grid-row: 1 / span 2;
  margin: 0;
  min-height: 0;
  padding: 12px;
  overflow: hidden;
}

.cp-content.cp-content--no-display,
.cp-content[data-display-mode="workspace-only"],
.cp-content:has(.cp-workspace-view.is-active:not([data-view="main"])) {
  grid-template-columns: minmax(0, 1fr) var(--cp-desktop-keypad);
  grid-template-rows: minmax(0, 1fr);
}

.cp-display--hidden,
.cp-content[data-display-mode="workspace-only"] .cp-display,
.cp-content:has(.cp-workspace-view.is-active:not([data-view="main"])) .cp-display {
  display: none !important;
}

.cp-content.cp-content--no-display .cp-workspace,
.cp-content[data-display-mode="workspace-only"] .cp-workspace,
.cp-content:has(.cp-workspace-view.is-active:not([data-view="main"])) .cp-workspace {
  grid-column: 1;
  grid-row: 1;
}

.cp-content.cp-content--no-display .cp-keypad,
.cp-content[data-display-mode="workspace-only"] .cp-keypad,
.cp-content:has(.cp-workspace-view.is-active:not([data-view="main"])) .cp-keypad {
  grid-column: 2;
  grid-row: 1;
}

.cp-workspace-view,
.cp-workspace-view.is-active,
.cp-workspace-body {
  min-height: 0;
}

.cp-workspace-view.is-active {
  height: 100%;
}

.cp-workspace-body {
  height: calc(100% - 32px);
  overflow: auto;
}

.cp-workspace-header {
  min-height: 32px;
  margin-bottom: 10px;
  gap: 10px;
}

.cp-workspace-title {
  margin: 0;
  font-size: clamp(18px, 1.35vw, 24px);
}

.cp-workspace-text,
.cp-input,
.cp-textarea,
.cp-select,
.cp-btn,
.cp-table,
.cp-finance-result,
.cp-convert-result {
  font-size: 13px;
}

.cp-input,
.cp-textarea,
.cp-select {
  min-height: 38px;
  border-radius: 12px;
  padding: 8px 10px;
}

.cp-textarea {
  min-height: 140px;
}

.cp-btn {
  min-height: 36px;
  padding: 8px 13px;
  border-radius: 12px;
}

.cp-workspace-body--split {
  grid-template-columns: minmax(260px, 0.95fr) minmax(300px, 1.25fr);
  gap: 14px;
}

.cp-workspace-body--convert {
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 14px;
}

.cp-convert-grid,
.cp-finance-grid {
  grid-template-columns: repeat(2, minmax(180px, 1fr));
  gap: 10px;
}

.cp-graph2d-controls,
.cp-graph3d-controls,
.cp-stat-controls,
.cp-finance-actions,
.cp-geometry-toolbar,
.cp-convert-actions,
.cp-settings-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.cp-graph2d-canvas,
.cp-graph3d-canvas,
.cp-stat-graph-canvas {
  width: 100%;
  height: clamp(320px, 45vh, 560px);
  border-radius: 16px;
  border-color: rgba(56, 189, 248, 0.14);
  touch-action: none;
}

.cp-geometry-canvas-wrapper {
  min-height: 420px;
  height: min(58vh, 620px);
}

.cp-geometry-canvas {
  min-height: 420px;
  border-radius: 16px;
}

.cp-sheet-wrapper,
.cp-finance-amort-table-wrapper,
.cp-convert-main,
.cp-workspace-body--scroll {
  overflow: auto;
  scrollbar-width: thin;
}

.cp-sheet-table {
  min-width: 860px;
  font-size: 12px;
}

.cp-sheet-cell {
  width: 96px;
  height: 34px;
  font-size: 12px;
}

.cp-keypad-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-start;
  overflow: visible;
}

.cp-keypad-tab {
  flex: 1 1 70px;
  min-height: 32px;
  padding: 7px 8px;
  font-size: 11px;
  border-radius: 12px;
}

.cp-keypad-page.is-active {
  min-height: 0;
}

.cp-keypad-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 10px;
}

.cp-key {
  min-height: clamp(44px, 5vh, 58px);
  padding: 8px 6px;
  border-radius: 14px;
  font-size: clamp(12px, 0.9vw, 15px);
}

/* Tablet: preserve a real app layout, but stack keypad below workspace. */
@media (max-width: 1023px) {
  body {
    padding: 10px;
  }

  .cp-device-shell,
  .cp-app {
    min-height: calc(100dvh - 20px);
  }

  .cp-app {
    border-radius: 22px;
    padding: 10px;
  }

  .cp-header {
    grid-template-columns: minmax(150px, auto) minmax(0, 1fr) auto;
    padding: 10px;
  }

  .cp-main {
    grid-template-columns: var(--cp-sidebar-tablet) minmax(0, 1fr);
  }

  .cp-tabs {
    padding: 7px;
  }

  .cp-tab-btn {
    min-height: 56px;
    border-radius: 16px;
  }

  .cp-content,
  .cp-content.cp-content--no-display,
  .cp-content[data-display-mode="workspace-only"],
  .cp-content:has(.cp-workspace-view.is-active:not([data-view="main"])) {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto minmax(320px, 1fr) auto;
    overflow: auto;
  }

  .cp-content.cp-content--no-display,
  .cp-content[data-display-mode="workspace-only"],
  .cp-content:has(.cp-workspace-view.is-active:not([data-view="main"])) {
    grid-template-rows: minmax(360px, 1fr) auto;
  }

  .cp-display {
    grid-column: 1;
    grid-row: 1;
    min-height: 150px;
  }

  .cp-workspace,
  .cp-content.cp-content--no-display .cp-workspace,
  .cp-content[data-display-mode="workspace-only"] .cp-workspace,
  .cp-content:has(.cp-workspace-view.is-active:not([data-view="main"])) .cp-workspace {
    grid-column: 1;
    grid-row: auto;
    min-height: 320px;
  }

  .cp-keypad,
  .cp-content.cp-content--no-display .cp-keypad,
  .cp-content[data-display-mode="workspace-only"] .cp-keypad,
  .cp-content:has(.cp-workspace-view.is-active:not([data-view="main"])) .cp-keypad {
    grid-column: 1;
    grid-row: auto;
  }

  .cp-keypad-grid {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }

  .cp-key--wide {
    grid-column: span 2;
  }

  .cp-graph2d-canvas,
  .cp-graph3d-canvas,
  .cp-stat-graph-canvas {
    height: clamp(280px, 38vh, 460px);
  }
}

/* Phone: app fills viewport, tabs become bottom navigation, controls remain touch-friendly. */
@media (max-width: 767px) {
  body {
    padding: 0;
    background: #020617;
  }

  .cp-device-shell,
  .cp-app {
    min-height: 100dvh;
  }

  .cp-app {
    border: 0;
    border-radius: 0;
    padding: max(8px, env(safe-area-inset-top)) 8px max(8px, env(safe-area-inset-bottom));
    gap: 8px;
    overflow: hidden;
  }

  .cp-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
    padding: 9px;
    border-radius: 16px;
  }

  .cp-header-center {
    grid-column: 1 / -1;
    grid-row: 2;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .cp-header-center::-webkit-scrollbar {
    display: none;
  }

  .cp-header-mode-indicators {
    width: max-content;
    min-width: 100%;
    justify-content: flex-start;
    flex-wrap: nowrap;
  }

  .cp-brand-title {
    font-size: 14px;
  }

  .cp-brand-subtitle {
    display: none;
  }

  .cp-header-btn {
    width: 34px;
    height: 34px;
  }

  .cp-main {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: minmax(0, 1fr) auto;
    gap: 8px;
    overflow: hidden;
  }

  .cp-content,
  .cp-content.cp-content--no-display,
  .cp-content[data-display-mode="workspace-only"],
  .cp-content:has(.cp-workspace-view.is-active:not([data-view="main"])) {
    grid-column: 1;
    grid-row: 1;
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr) auto;
    gap: 8px;
    overflow: hidden;
  }

  .cp-content.cp-content--no-display,
  .cp-content[data-display-mode="workspace-only"],
  .cp-content:has(.cp-workspace-view.is-active:not([data-view="main"])) {
    grid-template-rows: minmax(0, 1fr) auto;
  }

  .cp-tabs {
    grid-column: 1;
    grid-row: 2;
    flex-direction: row;
    gap: 6px;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 6px;
    border-radius: 18px;
    scroll-snap-type: x proximity;
    scrollbar-width: none;
  }

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

  .cp-tab-btn {
    flex: 0 0 64px;
    min-height: 52px;
    padding: 7px 6px;
    scroll-snap-align: start;
  }

  .cp-tab-btn .cp-tab-icon {
    font-size: 18px;
  }

  .cp-tab-btn .cp-tab-label {
    font-size: 9px;
  }

  .cp-display {
    min-height: 132px;
    padding: 10px;
    border-radius: 16px;
  }

  .cp-display-history {
    min-height: 58px;
    font-size: 11px;
  }

  .cp-display-status-row,
  .cp-display-expression-row,
  .cp-display-result-row,
  .cp-display-message-row {
    font-size: 11px;
  }

  .cp-display-status-right {
    max-width: 48%;
    overflow-x: auto;
  }

  .cp-workspace,
  .cp-content.cp-content--no-display .cp-workspace,
  .cp-content[data-display-mode="workspace-only"] .cp-workspace,
  .cp-content:has(.cp-workspace-view.is-active:not([data-view="main"])) .cp-workspace {
    min-height: 0;
    padding: 10px;
    border-radius: 16px;
    overflow: hidden;
  }

  .cp-workspace-body {
    height: calc(100% - 28px);
  }

  .cp-workspace-body--split,
  .cp-workspace-body--convert,
  .cp-convert-grid,
  .cp-finance-grid {
    grid-template-columns: 1fr;
  }

  .cp-workspace-title {
    font-size: 16px;
  }

  .cp-input,
  .cp-textarea,
  .cp-select,
  .cp-btn,
  .cp-table,
  .cp-finance-result,
  .cp-convert-result {
    font-size: 12px;
  }

  .cp-btn {
    min-height: 34px;
    padding: 7px 10px;
  }

  .cp-graph2d-canvas,
  .cp-graph3d-canvas,
  .cp-stat-graph-canvas {
    height: clamp(220px, 34vh, 360px);
  }

  .cp-geometry-canvas-wrapper,
  .cp-geometry-canvas {
    min-height: 260px;
    height: 100%;
  }

  .cp-keypad {
    padding: 8px;
    border-radius: 16px;
    overflow: hidden;
  }

  .cp-keypad-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 5px;
    scrollbar-width: none;
  }

  .cp-keypad-tabs::-webkit-scrollbar {
    display: none;
  }

  .cp-keypad-tab {
    flex: 0 0 auto;
    min-height: 29px;
    padding: 6px 9px;
    font-size: 10px;
  }

  .cp-keypad-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 5px;
    margin-top: 7px;
  }

  .cp-key {
    min-height: 39px;
    padding: 6px 4px;
    border-radius: 12px;
    font-size: 11px;
  }

  .cp-sheet-table {
    min-width: 720px;
  }
}

@media (max-width: 380px) {
  .cp-app {
    padding-left: 6px;
    padding-right: 6px;
  }

  .cp-header {
    padding: 7px;
  }

  .cp-indicator,
  .cp-display-status-item,
  .cp-display-status-value {
    padding: 3px 7px;
    font-size: 10px;
  }

  .cp-tab-btn {
    flex-basis: 58px;
  }

  .cp-key {
    min-height: 35px;
    font-size: 10px;
  }

  .cp-keypad-grid {
    gap: 4px;
  }
}

@media (min-width: 1280px) {
  .cp-app {
    min-height: calc(100dvh - 48px);
  }

  .cp-keypad-grid {
    gap: 9px;
  }
}