/* ============================================================
   Layout — header, navigation, panels, footer, breakpoints
   ============================================================ */

.app-header,
.tabs,
.app-main,
.app-footer {
  width: min(var(--page-width), calc(100% - 2.5rem));
  margin-inline: auto;
}

/* ---------- Header ---------- */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 18px;
  padding: 14px 20px;
  border-radius: var(--radius-lg);
  position: sticky;
  top: 12px;
  z-index: 30;
}

.brand {
  display: flex;
  align-items: center;
  gap: 13px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 15px;
  color: #fff;
  background: linear-gradient(140deg, var(--navy-800) 0%, var(--blue-600) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35), 0 12px 24px -14px rgba(16, 36, 81, 0.9);
  flex: none;
}

.brand-text {
  min-width: 0;
}

.brand-text h1 {
  font-size: 21px;
  font-weight: 750;
  letter-spacing: -0.02em;
  background: linear-gradient(100deg, var(--navy-900), var(--blue-600));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand-text p {
  margin-top: 1px;
  font-size: 12.5px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
}

.header-download {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 11px;
  color: var(--navy-800);
  background: rgba(255, 255, 255, 0.72);
  font-size: 12.4px;
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
  transition:
    background 0.2s var(--ease-out),
    border-color 0.2s var(--ease-out),
    transform 0.2s var(--ease-out);
}

.header-download:hover {
  background: #fff;
  border-color: rgba(36, 83, 212, 0.32);
  transform: translateY(-1px);
}

.header-download svg {
  flex: none;
  opacity: 0.8;
}

@media (max-width: 1120px) {
  .header-download span {
    display: none;
  }

  .header-download {
    padding: 8px 9px;
  }
}

/* ---------- Tabs ---------- */

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
  padding: 6px;
  border-radius: var(--radius-md);
  width: fit-content;
  max-width: 100%;
}

.tab {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 18px;
  border: 0;
  border-radius: 11px;
  background: transparent;
  color: var(--muted-strong);
  font-weight: 620;
  font-size: 14px;
  letter-spacing: 0.01em;
  transition:
    color 0.2s var(--ease-out),
    background 0.25s var(--ease-out),
    transform 0.2s var(--ease-out),
    box-shadow 0.25s var(--ease-out);
  white-space: nowrap;
}

.tab:hover {
  color: var(--navy-800);
  background: rgba(230, 237, 255, 0.65);
}

.tab:active {
  transform: scale(0.98);
}

.tab.is-active {
  color: #fff;
  background: linear-gradient(135deg, var(--navy-800) 0%, var(--blue-600) 100%);
  box-shadow: 0 12px 24px -14px rgba(36, 83, 212, 0.95);
}

.tab-icon {
  display: grid;
  place-items: center;
  opacity: 0.85;
}

.tab.is-active .tab-icon {
  opacity: 1;
}

/* ---------- Main / panels ---------- */

.app-main {
  margin-top: 20px;
  padding-bottom: 30px;
}

.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
  animation: panelIn 0.34s var(--ease-out);
}

.panel-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
  padding: 13px 18px;
  border-radius: var(--radius-lg);
  animation: panelIn 0.4s var(--ease-out) both;
}

.toolbar-text {
  min-width: 0;
}

.toolbar-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--navy-900);
}

.toolbar-hint {
  margin-top: 1px;
  font-size: 12.4px;
  color: var(--muted);
  max-width: 72ch;
}

.panel-grid {
  display: grid;
  grid-template-columns: 356px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.settings-card {
  position: sticky;
  top: 106px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.list-card {
  min-width: 0;
}

/* ---------- Footer ---------- */

.app-footer {
  padding: 8px 4px 34px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}

.footer-sep {
  margin-inline: 6px;
  opacity: 0.55;
}

.footer-link {
  color: var(--blue-600);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(36, 83, 212, 0.28);
}

.footer-link:hover {
  color: var(--navy-800);
  border-bottom-color: currentColor;
}

/* ---------- Responsive ---------- */

@media (max-width: 1020px) {
  .panel-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .settings-card {
    position: static;
  }
}

@media (max-width: 720px) {
  .panel-toolbar {
    align-items: flex-start;
    gap: 12px;
  }

  .app-header,
  .tabs,
  .app-main,
  .app-footer {
    width: calc(100% - 1.5rem);
  }

  .app-header {
    top: 8px;
    padding: 12px 14px;
    gap: 12px;
  }

  .brand-text p {
    display: none;
  }

  .brand-mark {
    width: 40px;
    height: 40px;
    border-radius: 13px;
  }

  .brand-text h1 {
    font-size: 19px;
  }

  .tabs {
    width: 100%;
    justify-content: space-between;
  }

  .tab {
    flex: 1 1 auto;
    justify-content: center;
    padding: 10px 9px;
    font-size: 12.8px;
  }
}

@media (max-width: 620px) {
  .tab-icon {
    display: none;
  }

  .tab {
    padding: 9px 8px;
    font-size: 12px;
  }
}

@media (max-width: 460px) {
  .tab {
    gap: 6px;
  }

  .preset-actions {
    flex-direction: column;
  }
}