:root {
  color-scheme: dark;
  --page: #070d1a;
  --sidebar: #0a1221;
  --panel: #151f31;
  --panel-strong: #101827;
  --panel-soft: #1a2538;
  --field: #090f1d;
  --border: #263449;
  --border-soft: #202d41;
  --text: #f7f9ff;
  --muted: #8390aa;
  --muted-strong: #a7b6d1;
  --accent: #f6a60c;
  --accent-soft: rgba(246, 166, 12, .16);
  --good: #214d34;
  --bad: #603035;
  --shadow: 0 20px 50px rgba(0, 0, 0, .28);
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
  letter-spacing: 0;
  background: var(--page);
  color: var(--text);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover { color: #ffc04d; }

.app-shell {
  display: grid;
  min-height: 100vh;
  grid-template-columns: 218px minmax(0, 1fr);
  background: var(--page);
}

.sidebar {
  position: sticky;
  top: 0;
  display: flex;
  height: 100vh;
  flex-direction: column;
  border-right: 1px solid var(--border-soft);
  background: var(--sidebar);
}

.brand {
  display: flex;
  height: 72px;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border-soft);
  padding: 14px 18px;
}

.brand img {
  display: block;
  max-width: 178px;
  max-height: 38px;
  object-fit: contain;
}

.side-nav {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding-top: 24px;
}

.nav-group {
  margin: 0 14px 10px;
  color: var(--muted-strong);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 4px;
  text-transform: uppercase;
}

.nav-link {
  display: flex;
  min-height: 40px;
  align-items: center;
  gap: 10px;
  border-right: 3px solid transparent;
  color: var(--muted-strong);
  padding: 0 14px;
}

.nav-link:hover,
.nav-link.active {
  background: rgba(246, 166, 12, .12);
  border-right-color: var(--accent);
  color: var(--accent);
}

.nav-link + .nav-group { margin-top: 28px; }

.sidebar-footer {
  border-top: 1px solid var(--border-soft);
  color: var(--muted);
  font-size: 11px;
  line-height: 1.55;
  padding: 12px 14px;
}

.sidebar-footer p { margin: 0; }

.workspace {
  min-width: 0;
  background: var(--page);
}

.topbar {
  display: flex;
  min-height: 59px;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-soft);
  padding: 0 16px 0 28px;
}

.topbar h1 {
  margin: 0;
  color: var(--text);
  font-size: 19px;
  line-height: 1.2;
}

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

.language {
  display: inline-flex;
  min-width: 28px;
  height: 22px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
}

.language.active {
  background: var(--accent);
  color: #151007;
}

.key-dot {
  display: inline-flex;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--accent);
  background: var(--panel-strong);
  font-size: 14px;
}

.content {
  max-width: 1660px;
  margin: 0 auto;
  padding: 28px;
}

.guest-strip {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 12px;
}

.guest-strip p { margin: 0; }

.pill {
  display: inline-flex;
  min-height: 26px;
  align-items: center;
  border: 1px solid rgba(246, 166, 12, .45);
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  padding: 0 11px;
}

.notice {
  display: flex;
  min-height: 55px;
  align-items: center;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 16px;
  border: 1px solid rgba(246, 166, 12, .35);
  border-radius: 7px;
  background: rgba(28, 24, 24, .82);
  color: var(--muted);
  padding: 14px 20px;
}

.notice strong {
  color: var(--muted-strong);
  margin-right: 4px;
}

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.tab-button {
  min-height: 40px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel-strong);
  color: var(--text);
  cursor: pointer;
  font-weight: 700;
  padding: 0 18px;
}

.tab-button.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #171008;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.card {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card h2 {
  margin: 0;
  border-bottom: 1px solid var(--border);
  background: var(--panel-strong);
  color: var(--text);
  font-size: 16px;
  padding: 18px 20px;
}

.card form {
  padding: 24px 26px 26px;
}

h3 {
  margin: 24px 0 14px;
  color: var(--text);
  font-size: 14px;
}

label {
  display: block;
  margin-bottom: 16px;
  color: var(--muted-strong);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .8px;
  text-transform: uppercase;
}

input[type="text"],
input[type="number"],
input[type="file"] {
  width: 100%;
  min-height: 34px;
  margin-top: 8px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--field);
  color: var(--text);
  font: inherit;
  padding: 8px 12px;
}

input[type="file"] {
  cursor: pointer;
  color: var(--muted-strong);
}

input::placeholder { color: #65728c; }

input:focus,
button:focus-visible,
.download-link:focus-visible {
  border-color: var(--accent);
  outline: 2px solid rgba(246, 166, 12, .22);
  outline-offset: 1px;
}

button,
.download-link {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--accent);
  border-radius: 5px;
  background: var(--accent);
  color: #171008;
  cursor: pointer;
  font-weight: 700;
  text-decoration: none;
  padding: 8px 14px;
}

button:hover,
.download-link:hover {
  background: #ffb526;
  color: #171008;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.grid.two {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.preset-box {
  align-self: end;
}

.parts-headline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 20px;
}

.parts-headline h3 { margin: 0; }

.part-row {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(180px, 1fr) auto;
  gap: 10px;
  margin-bottom: 10px;
}

.part-row input { margin-top: 0; }

.remove-part {
  border-color: var(--border);
  background: var(--panel-strong);
  color: var(--muted-strong);
}

.remove-part:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

.size-check,
.result {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--panel-strong);
  color: var(--muted-strong);
  padding: 14px 16px;
}

.result { margin: 0 26px 26px; }

.size-check.ok {
  background: rgba(33, 77, 52, .52);
  border-color: #3b7c53;
}

.size-check.error {
  background: rgba(96, 48, 53, .58);
  border-color: #8e4d55;
}

.hidden { display: none; }

.error-text { color: #ffb9b9; }

.top-gap { margin-top: 16px; }

table {
  width: 100%;
  margin-top: 12px;
  border-collapse: collapse;
  font-size: 13px;
}

th,
td {
  border-bottom: 1px solid var(--border);
  padding: 12px 10px;
  text-align: left;
}

th {
  color: var(--muted-strong);
  font-size: 11px;
  letter-spacing: 1.8px;
  text-transform: uppercase;
}

td { color: var(--text); }

small {
  display: block;
  margin-top: 7px;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .brand {
    justify-content: flex-start;
  }

  .side-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 12px;
    gap: 8px;
  }

  .nav-group,
  .sidebar-footer {
    display: none;
  }

  .nav-link {
    border: 1px solid var(--border);
    border-radius: 6px;
  }

  .nav-link.active {
    border-color: var(--accent);
  }

  .topbar {
    padding-left: 18px;
  }

  .content {
    padding: 18px;
  }

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

@media (max-width: 760px) {
  .grid.two,
  .part-row {
    grid-template-columns: 1fr;
  }

  .parts-headline {
    align-items: stretch;
    flex-direction: column;
  }

  .tabs {
    flex-direction: column;
  }

  .card form {
    padding: 20px 18px;
  }

  .result {
    margin: 0 18px 20px;
  }
}

@media (max-width: 520px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
    padding: 16px 18px;
  }

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