@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap");

:root {
  --font: "Inter", "Segoe UI", sans-serif;
  --radius: 10px;
  --radius-sm: 7px;
  --toolbar-h: 58px;
  --trans: 140ms ease;
}

body {
  margin: 0;
  height: 100vh;
  overflow: hidden;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
}

body::before {
  display: none;
}

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

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

button,
select,
input[type="number"],
input[type="text"] {
  border: 1px solid var(--edge);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
}

button {
  min-height: 30px;
  padding: 0 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--trans), transform var(--trans), border-color var(--trans);
}

button:hover {
  background: var(--button-hover);
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.4;
  pointer-events: none;
}

select,
input {
  min-height: 30px;
  padding: 0 7px;
}

input[type="number"] {
  text-align: right;
}

.toolbar {
  height: var(--toolbar-h);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 10px;
  border-bottom: 1px solid var(--edge-strong);
  background: var(--surface);
  position: relative;
  z-index: 10;
}

.brand h1 {
  font-size: 1rem;
  letter-spacing: 0.01em;
}

.brand p {
  font-size: 0.74rem;
  color: var(--muted);
}

.toolbar-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.icon-btn {
  width: 32px;
  min-width: 32px;
  height: 30px;
  padding: 0;
  font-size: 15px;
}

#themeToggle {
  width: 34px;
  min-width: 34px;
  padding: 0;
}

#themeIcon {
  font-size: 15px;
  line-height: 1;
}

.workspace {
  display: flex;
  height: calc(100vh - var(--toolbar-h));
  min-height: 0;
}

.panel {
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--surface);
}

.panel-left {
  width: 34%;
  min-width: 280px;
  max-width: 74%;
  border-right: 1px solid var(--edge);
}

.panel-right {
  flex: 1;
}

.panel-head {
  padding: 9px 12px;
  border-bottom: 1px solid var(--edge);
  background: var(--title-bg);
}

.panel-head h2 {
  font-size: 0.92rem;
  margin-bottom: 2px;
}

.panel-head small {
  color: var(--muted);
  font-size: 0.76rem;
}

.panel-body {
  padding: 10px;
  overflow: auto;
  min-height: 0;
}

.divider {
  width: 8px;
  cursor: col-resize;
  background: linear-gradient(180deg, transparent, var(--edge), transparent);
}

.tabs {
  display: flex;
  gap: 4px;
  padding: 8px 10px 0;
  border-bottom: 1px solid var(--edge);
  background: var(--surface);
}

.tab {
  padding: 6px 10px;
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  background: var(--surface-2);
  font-size: 0.82rem;
}

.tab.active {
  background: var(--tab-active);
  border-color: var(--edge-strong);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 8px;
  margin-bottom: 8px;
}

.card {
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background: var(--surface-2);
  padding: 8px 10px;
}

.card h3 {
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 5px;
}

.card .value {
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.table-wrap {
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: auto;
  background: var(--surface-2);
  margin-bottom: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.76rem;
}

th,
td {
  padding: 5px 7px;
  border-right: 1px solid var(--edge-soft);
  border-bottom: 1px solid var(--edge-soft);
  white-space: nowrap;
  text-align: right;
}

th:first-child,
td:first-child,
th:nth-child(2),
td:nth-child(2) {
  text-align: left;
}

thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--table-head);
}

.chart-wrap {
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background: var(--surface-2);
  padding: 8px;
}

.chart-wrap h3 {
  font-size: 0.82rem;
  margin-bottom: 6px;
}

#stiffnessChart {
  width: 100%;
  display: block;
  border: 1px solid var(--edge-soft);
  border-radius: 8px;
  background: var(--surface);
}

.input-groups {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.input-group {
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface-2);
}

.group-toggle {
  width: 100%;
  border: none;
  border-radius: 0;
  text-align: left;
  background: var(--group-head);
  padding: 7px 10px;
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.8rem;
  font-weight: 600;
}

.group-toggle:hover {
  transform: none;
}

.group-arrow {
  font-size: 0.82rem;
  transform: rotate(90deg);
  transition: transform var(--trans);
}

.input-group.collapsed .group-arrow {
  transform: rotate(0deg);
}

.group-content {
  display: block;
}

.input-group.collapsed .group-content {
  display: none;
}

.input-row {
  display: grid;
  grid-template-columns: 1fr 56px 96px;
  gap: 6px;
  align-items: center;
  padding: 6px 9px;
  border-top: 1px solid var(--edge-soft);
}

.input-row label {
  font-size: 0.77rem;
}

.input-row .unit {
  color: var(--muted);
  font-size: 0.72rem;
}

.scenario-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
}

.scenario-toolbar label {
  font-size: 0.78rem;
}

.scenario-editor {
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  padding: 8px;
  margin-bottom: 8px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 7px;
  background: var(--surface-2);
  align-items: end;
}

.scenario-editor label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 58px;
}

.scenario-editor input,
.scenario-editor select {
  height: 30px;
  box-sizing: border-box;
}

.scenario-editor span {
  font-size: 0.7rem;
  color: var(--muted);
}

:root,
[data-theme="excel-dark"] {
  --bg: #2f3135;
  --bg-detail: none;
  --surface: #2f3238eb;
  --surface-2: #393c43;
  --title-bg: #3e4b5d;
  --tab-active: #42464f;
  --table-head: #3e4b5d;
  --group-head: linear-gradient(90deg, #3e4b5d, #3e4b5d);
  --edge: #525862;
  --edge-soft: #474c55;
  --edge-strong: #697381;
  --text: #e1e4eb;
  --muted: #a8aeb9;
  --button-hover: #4a4e56;
  --accent: #ff9c66;
  --series-orange: #ff9c66;
  --series-blue: #6ea8ff;
  --plot-bg: #2a2d33;
}

[data-theme="excel-light"] {
  --bg: #ededf0;
  --bg-detail: none;
  --surface: #f4f4f7e6;
  --surface-2: #ebebef;
  --title-bg: linear-gradient(90deg, #d8e1ee, #dae4ef);
  --tab-active: #f8f8fb;
  --table-head: #d8e1ee;
  --group-head: linear-gradient(90deg, #d8e1ee, #dae4ef);
  --edge: #b8bdc7;
  --edge-soft: #cdd1d8;
  --edge-strong: #9ea5b0;
  --text: #2e323a;
  --muted: #616774;
  --button-hover: #dfdfe6;
  --accent: #de7b43;
  --series-orange: #de7b43;
  --series-blue: #3b7dd8;
  --plot-bg: #e5e6ea;
}

@media (max-width: 980px) {
  body {
    overflow: auto;
  }

  .workspace {
    flex-direction: column;
    height: auto;
    min-height: calc(100vh - var(--toolbar-h));
  }

  .panel-left,
  .panel-right {
    width: auto;
    min-width: 0;
    max-width: none;
    min-height: 42vh;
  }

  .divider {
    display: none;
  }

  .toolbar {
    height: auto;
    padding: 8px;
    gap: 8px;
    flex-wrap: wrap;
  }

  .toolbar-controls {
    flex-wrap: wrap;
  }
}

@media print {
  @page {
    size: A4 landscape;
    margin: 6mm;
  }

  body {
    background: #fff;
    color: #111;
    overflow: visible;
  }

  body::before,
  .toolbar,
  .divider,
  .panel-left,
  .tabs,
  #tab-passive,
  #tab-scenarios {
    display: none !important;
  }

  .workspace,
  .panel,
  .panel-right,
  .panel-body {
    display: block;
    height: auto;
    overflow: visible;
    border: none;
    box-shadow: none;
    background: #fff;
  }

  #tab-summary {
    display: block !important;
    transform: scale(0.76);
    transform-origin: top left;
    width: 131%;
  }

  #tab-summary .table-wrap {
    overflow: visible;
  }

  #tab-summary table {
    font-size: 7px;
  }

  #tab-summary th,
  #tab-summary td {
    padding: 2px 3px;
    white-space: nowrap;
  }

  #tab-summary .cards {
    gap: 4px;
    margin-bottom: 4px;
  }

  #tab-summary .card {
    padding: 4px 6px;
  }

  #tab-summary .chart-wrap {
    padding: 4px;
    margin-top: 4px;
  }

  .card,
  .table-wrap,
  .chart-wrap {
    border: 1px solid #ddd;
    background: #fff;
  }
}