:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --ink: #12253a;
  --muted: #55687d;
  --accent: #c23d2b;
  --accent-soft: #f5d6d1;
  --line: #d8e2ec;
  --metric-bg: #fcfdff;
  --input-bg: #ffffff;
  --canvas-bg: linear-gradient(180deg, #fff 0%, #f7fbff 100%);
  --chart-grid: #d9e3ee;
  --chart-grid-soft: #edf2f8;
  --chart-label: #5a6f84;
  --chart-zero: #42586f;
  --chart-title: #12253a;
}

:root[data-theme="dark"] {
  --bg: #131c27;
  --panel: #1a2432;
  --ink: #e7eef8;
  --muted: #a0b2c8;
  --accent: #e25a44;
  --accent-soft: #4a2b27;
  --line: #304156;
  --metric-bg: #16202c;
  --input-bg: #101822;
  --canvas-bg: linear-gradient(180deg, #1b2735 0%, #15202c 100%);
  --chart-grid: #3b4f66;
  --chart-grid-soft: #2a3a4d;
  --chart-label: #afbfd3;
  --chart-zero: #d1dced;
  --chart-title: #e7eef8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: radial-gradient(circle at 10% 10%, #ffffff 0, var(--bg) 45%, #e9f0f8 100%);
  color: var(--ink);
  transition: background 0.2s ease, color 0.2s ease;
  overflow-x: hidden;
}

:root[data-theme="dark"] body {
  background: radial-gradient(circle at 10% 10%, #243445 0, var(--bg) 45%, #0e161f 100%);
}

.layout {
  display: grid;
  grid-template-columns: minmax(420px, 620px) 1fr;
  gap: 16px;
  padding: 16px;
  min-height: 100vh;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 8px 22px rgba(17, 37, 62, 0.08);
  min-width: 0;
}

h1 {
  margin: 0;
  font-size: 1.45rem;
}

.title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.toolbar-switches {
  display: flex;
  align-items: center;
  gap: 10px;
}

h2 {
  margin-top: 16px;
  margin-bottom: 8px;
  font-size: 1rem;
}

.subtitle,
.hint,
.note {
  margin: 6px 0 10px;
  color: var(--muted);
  font-size: 0.9rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

label {
  display: grid;
  gap: 4px;
  font-size: 0.86rem;
  min-width: 0;
}

input {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px;
  font-size: 16px;
  background: var(--input-bg);
  color: var(--ink);
}

select {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px;
  font-size: 16px;
  background: var(--input-bg);
  color: var(--ink);
}

input:focus {
  outline: 2px solid var(--accent-soft);
  border-color: var(--accent);
}

select:focus {
  outline: 2px solid var(--accent-soft);
  border-color: var(--accent);
}

.structure-select-row {
  margin-top: 4px;
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 8px;
  align-items: center;
}

.structure-select-row label {
  margin: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
  font-size: 0.86rem;
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

th,
td {
  padding: 6px;
  border-bottom: 1px solid var(--line);
  text-align: right;
  white-space: nowrap;
}

th:first-child,
td:first-child {
  text-align: left;
}

td input {
  width: 100%;
  text-align: right;
  padding: 6px;
}

th:last-child,
td:last-child {
  text-align: center;
  width: 56px;
}

.structure-actions {
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.structure-actions #runBtn {
  margin-left: auto;
}

.comparison-card {
  margin-top: 14px;
}

.comparison-card h3 {
  margin: 0 0 8px;
  font-size: 0.95rem;
}

.comparison-card td,
.comparison-card th {
  font-size: 0.82rem;
}

.comparison-card tr.is-changed {
  background: color-mix(in srgb, var(--accent-soft) 40%, transparent);
}

.row-remove-btn {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  border-radius: 8px;
  padding: 4px 6px;
  font-size: 0.78rem;
  min-width: 32px;
}

.actions {
  margin-top: 14px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

button {
  border: none;
  background: linear-gradient(135deg, #d44934, #b53220);
  color: #fff;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.95rem;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.05);
}

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}

.theme-switch {
  border: none;
  background: transparent;
  padding: 0;
  margin: 0;
}

.lang-switch {
  border: none;
  background: transparent;
  padding: 0;
  margin: 0;
}

.lang-switch-track {
  width: 78px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 6px 14px rgba(12, 24, 39, 0.18);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  position: relative;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.lang-label {
  position: relative;
  z-index: 1;
  user-select: none;
}

.lang-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 34px;
  height: 26px;
  border-radius: 999px;
  background: linear-gradient(135deg, #d44934, #b53220);
  transition: transform 0.18s ease;
}

:root[lang="en"] .lang-thumb {
  transform: translateX(38px);
}

.theme-switch-track {
  width: 66px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 6px 14px rgba(12, 24, 39, 0.18);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px;
  position: relative;
}

.lang-switch-track,
.theme-switch-track {
  flex-shrink: 0;
}

.theme-icon {
  font-size: 13px;
  line-height: 1;
  color: var(--muted);
  user-select: none;
}

.theme-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: linear-gradient(135deg, #9aa7b6, #6e7f92);
  transition: transform 0.18s ease;
}

:root[data-theme="dark"] .theme-thumb {
  transform: translateX(32px);
}

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

.metric {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  background: var(--metric-bg);
}

.metric .k {
  color: var(--muted);
  font-size: 0.8rem;
}

.metric .v {
  margin-top: 2px;
  font-size: 1.02rem;
  font-weight: 600;
}

canvas {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--canvas-bg);
}

#participantStats {
  margin-top: 10px;
  font-size: 0.86rem;
  color: var(--muted);
  max-height: 180px;
  overflow: auto;
  border-top: 1px solid var(--line);
  padding-top: 8px;
}

.participant-line {
  display: grid;
  grid-template-columns: 132px 58px minmax(88px, 1fr) 10px 68px minmax(88px, 1fr) 10px 70px minmax(88px, 1fr);
  gap: 8px;
  align-items: center;
  padding: 4px 0;
  border-bottom: 1px solid var(--line);
}

.participant-line:last-child {
  border-bottom: none;
}

.participant-name,
.participant-metric-label,
.participant-separator {
  white-space: nowrap;
}

.participant-metric-value {
  text-align: right;
  white-space: nowrap;
}

.site-footer {
  padding: 0 16px 16px;
  text-align: center;
}

.contact-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
}

.contact-link:hover {
  color: var(--ink);
  text-decoration: underline;
}

@media (max-width: 700px) {
  .participant-line {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .participant-separator {
    display: none;
  }

  .participant-metric-value {
    text-align: left;
  }
}

@media (max-width: 1080px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .title-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .toolbar-switches {
    align-self: flex-end;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .structure-select-row {
    grid-template-columns: 1fr;
  }

  .structure-actions {
    display: grid;
  }

  .structure-actions button {
    width: 100%;
  }
}

@media (max-width: 540px) {
  .layout {
    padding: 10px;
    gap: 10px;
  }

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

  h1 {
    font-size: 1.2rem;
    line-height: 1.25;
  }

  .subtitle,
  .hint,
  .note {
    font-size: 0.84rem;
  }

  th,
  td {
    padding: 5px;
    font-size: 0.8rem;
  }

  td input {
    min-width: 72px;
    font-size: 16px;
  }

  #summary {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 420px) {
  .toolbar-switches {
    width: 100%;
    justify-content: flex-end;
  }

  .lang-switch-track {
    width: 74px;
  }

  .theme-switch-track {
    width: 62px;
  }

  :root[data-theme="dark"] .theme-thumb {
    transform: translateX(28px);
  }

  :root[lang="en"] .lang-thumb {
    transform: translateX(34px);
  }
}