html,
body {
  min-width: 320px;
  min-height: 100%;
  margin: 0;
  background: var(--product-canvas);
  color: var(--product-text);
  font-family: var(--product-font-ui);
}

body {
  overflow: hidden;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

svg {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: var(--product-radius-control);
  background: var(--product-accent);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.studio-shell {
  display: grid;
  grid-template-columns: 216px minmax(0, 1fr) 320px;
  height: 100vh;
}

.nav-drawer-toggle,
.nav-drawer-mask {
  display: none;
}

.studio-nav {
  display: flex;
  min-height: 0;
  flex-direction: column;
  gap: 12px;
  padding: 16px 10px 12px;
  border-right: 1px solid var(--product-border);
  background: var(--product-canvas);
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 8px;
}

.brand-mark strong,
.brand-mark small {
  display: block;
  letter-spacing: 0.08em;
}

.brand-mark strong {
  font-size: 13px;
}

.brand-mark small {
  margin-top: 2px;
  color: var(--product-text-muted);
  font: 500 12px/1 var(--product-font-ui);
  letter-spacing: 0;
}

.brand-glyph {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--product-border-strong);
  border-radius: 9px;
  color: var(--product-accent-hover);
  font: 700 11px/1 var(--product-font-mono);
}

.studio-nav nav {
  display: grid;
  min-height: 0;
  align-content: start;
  gap: 2px;
  overflow: auto;
}

.nav-group {
  margin: 16px 8px 4px;
  color: var(--product-text-muted);
  font: 500 12px/1.2 var(--product-font-ui);
  letter-spacing: 0;
}

.nav-group:first-child {
  margin-top: 4px;
}

.nav-item {
  display: flex;
  width: 100%;
  min-height: 34px;
  align-items: center;
  gap: 8px;
  padding: 0 10px 0 16px;
  border: 1px solid transparent;
  border-radius: var(--product-radius-control);
  background: transparent;
  color: var(--product-text-secondary);
  cursor: pointer;
  font-size: 13px;
  text-align: left;
}

.nav-item svg {
  width: 18px;
  height: 18px;
}

.nav-item:hover {
  color: var(--product-text);
  background: var(--product-panel);
}

.nav-item.is-active {
  border-color: transparent;
  color: var(--product-text);
  background: transparent;
  box-shadow: inset 2px 0 0 var(--product-accent);
}

.nav-foot {
  display: grid;
  gap: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--product-border);
}

.model-select {
  display: grid;
  gap: 4px;
  min-width: 148px;
}

.model-select span {
  color: var(--product-text-muted);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.workspace {
  min-width: 0;
  overflow-y: auto;
  background: var(--product-panel);
}

.workspace-header {
  position: sticky;
  top: 0;
  z-index: 4;
  display: flex;
  min-height: 56px;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-bottom: 1px solid var(--product-border);
  background: var(--product-panel);
}

.workspace-header::after {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 0;
  height: 2px;
  background: repeating-linear-gradient(
    90deg,
    var(--product-accent) 0 10px,
    transparent 10px 16px
  );
  opacity: 0.55;
}

.eyebrow {
  display: none;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: 24px;
  letter-spacing: -0.02em;
}

h2 {
  margin-bottom: 0;
  font-size: 20px;
}

.account-actions,
.generation-bar,
.section-heading,
.rail-heading,
.field-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--product-space-3);
}

.credit-button {
  display: flex;
  min-height: 40px;
  align-items: center;
  gap: 9px;
  padding: 0 12px;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-control);
  background: var(--product-panel);
  cursor: pointer;
}

.credit-button span {
  color: var(--product-text-muted);
  font-size: 11px;
}

.credit-button strong {
  font: 700 14px/1 var(--product-font-mono);
}

.workspace-panel {
  width: min(1100px, calc(100% - 40px));
  margin: 16px auto 32px;
}

.mode-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  padding: 0;
  border-bottom: 1px solid var(--product-border);
  border-radius: 0;
  margin-bottom: 16px;
  background: transparent;
  overflow: hidden;
}

.mode-tab {
  display: flex;
  min-height: 64px;
  align-items: center;
  gap: 13px;
  padding: 12px 16px;
  border: 0;
  background: var(--product-panel-muted);
  cursor: pointer;
  text-align: left;
}

.mode-tab:hover {
  background: var(--product-panel);
}

.mode-tab.is-active {
  background: transparent;
  box-shadow: inset 0 -2px var(--product-accent);
}

.mode-index {
  color: var(--product-text-muted);
  font: 600 10px/1 var(--product-font-mono);
}

.mode-tab strong,
.mode-tab small {
  display: block;
}

.mode-tab strong {
  font-size: 14px;
}

.mode-tab small {
  margin-top: 4px;
  color: var(--product-text-muted);
  font-size: 11px;
  line-height: 1.35;
}

#compose-form {
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-panel);
  background: var(--product-panel);
  box-shadow: var(--product-shadow-float);
}

.mode-pane {
  min-height: 420px;
  padding: 24px;
}

.field-block {
  padding: 18px;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-panel);
  background: var(--product-panel-muted);
}

.field-block-primary {
  min-height: 100%;
}

label {
  display: block;
  margin-bottom: 8px;
  color: var(--product-text-secondary);
  font-size: 12px;
  font-weight: 600;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-control);
  outline: 0;
  background: var(--product-canvas);
  color: var(--product-text);
}

input,
select {
  height: 42px;
  padding: 0 12px;
}

input[type="checkbox"],
input[type="radio"],
input[type="range"],
input[type="file"] {
  width: auto;
  height: auto;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

input[type="file"],
input[type="range"] {
  width: 100%;
}

input[type="range"] {
  accent-color: var(--product-accent);
}

textarea {
  min-height: 120px;
  padding: 12px;
  resize: vertical;
  line-height: 1.65;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--product-accent);
  box-shadow: var(--product-focus);
}

::placeholder {
  color: var(--product-text-muted);
}

.field-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 9px;
  color: var(--product-text-muted);
  font-size: 10px;
}

.professional-grid,
.sound-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.85fr);
  gap: 16px;
}

.control-stack {
  display: grid;
  align-content: start;
  gap: 12px;
}

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

.style-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.style-chip {
  padding: 5px 9px;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-pill);
  background: transparent;
  color: var(--product-text-muted);
  cursor: pointer;
  font-size: 10px;
}

.style-chip:hover,
.style-chip.is-selected {
  border-color: var(--product-accent);
  color: var(--product-accent-hover);
  background: var(--product-accent-soft);
}

.text-button {
  border: 0;
  background: transparent;
  color: var(--product-accent-hover);
  cursor: pointer;
  font-size: 11px;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-control);
  margin: 0;
  cursor: pointer;
}

.check-row input {
  width: 17px;
  height: 17px;
  accent-color: var(--product-accent);
}

.check-row strong,
.check-row small {
  display: block;
}

.check-row small {
  margin-top: 3px;
  color: var(--product-text-muted);
  font-weight: 400;
}

.generation-bar {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 8px;
  min-height: 82px;
  padding: 16px 20px;
  border-top: 1px solid var(--product-border);
}

.generation-terms {
  color: var(--product-text-muted);
  font-size: 12px;
}

.button {
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: var(--product-radius-control);
  cursor: pointer;
  font-weight: 600;
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.button-primary {
  border-color: var(--product-accent);
  background: var(--product-accent);
  color: var(--product-accent-ink);
}

.button-primary:hover:not(:disabled) {
  background: var(--product-accent-hover);
}

.button-secondary {
  border-color: var(--product-border);
  background: var(--product-panel);
}

.button-secondary:hover {
  border-color: var(--product-border-strong);
  background: var(--product-panel-raised);
}

#generate-button {
  min-width: 172px;
}

#generate-button kbd {
  margin-left: 12px;
  padding: 2px 5px;
  border: 1px solid rgba(42, 34, 12, 0.35);
  border-radius: 4px;
  background: rgba(42, 34, 12, 0.08);
  font: 9px/1.2 var(--product-font-mono);
}

.form-message {
  min-height: 16px;
  margin: 0;
  padding: 0 20px 14px;
  color: var(--product-danger);
  font-size: 12px;
}

.activity-rail {
  display: flex;
  min-width: 0;
  min-height: 0;
  flex-direction: column;
  overflow: auto;
  border-left: 1px solid var(--product-border);
  background: var(--product-canvas);
}

.rail-heading {
  min-height: 84px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--product-border);
}

.icon-button {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-control);
  background: var(--product-panel);
  cursor: pointer;
}

.icon-button svg {
  width: 17px;
  height: 17px;
}

.job-list,
.library-list {
  display: grid;
  gap: 10px;
}

.job-list {
  flex: 1;
  align-content: start;
  overflow-y: auto;
  padding: 12px;
}

.job-card,
.library-card,
.sku-card {
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-control);
  background: var(--product-panel);
}

.job-card {
  padding: 13px;
}

.job-card-head,
.asset-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.job-card h3,
.library-card h3 {
  margin: 0;
  font-size: 12px;
}

.job-meta,
.asset-meta {
  margin: 6px 0 0;
  color: var(--product-text-muted);
  font: 10px/1.5 var(--product-font-mono);
}

.status {
  padding: 3px 7px;
  border-radius: var(--product-radius-pill);
  background: var(--canvas-sunk);
  color: var(--product-text-secondary);
  font-size: 9px;
}

.status.is-working {
  color: var(--product-accent-hover);
  background: var(--product-accent-soft);
}

.status.is-success {
  color: var(--product-success);
  background: rgba(91, 122, 78, 0.14);
}

.status.is-failed {
  color: var(--product-danger);
  background: rgba(184, 68, 42, 0.12);
}

.job-error {
  margin: 8px 0 0;
  color: var(--product-danger);
  font-size: 10px;
}

.rail-foot {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--product-border);
  color: var(--product-text-muted);
  font-size: 9px;
}

.empty-state {
  padding: 42px 18px;
  color: var(--product-text-muted);
  font-size: 12px;
  text-align: center;
}

.section-heading {
  margin-bottom: 20px;
}

.section-lead {
  color: var(--product-text-secondary);
  font-size: 13px;
}

.library-card {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) minmax(220px, 1.4fr) auto;
  align-items: center;
  gap: 18px;
  padding: 16px;
}

.library-card audio {
  width: 100%;
  height: 34px;
}

.asset-actions button {
  min-height: 34px;
}

.sku-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.sku-card {
  display: flex;
  min-height: 190px;
  flex-direction: column;
  padding: 18px;
}

.sku-card h3 {
  margin: 0;
  font-size: 13px;
}

.sku-price {
  margin: 12px 0;
  font: 700 22px/1 var(--product-font-mono);
}

.sku-card p {
  color: var(--product-text-muted);
  font-size: 11px;
  line-height: 1.6;
}

.sku-card .button {
  margin-top: auto;
}

.payment-box {
  display: flex;
  align-items: center;
  gap: 20px;
  width: fit-content;
  padding: 18px;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-panel);
  margin-top: 18px;
  background: var(--product-panel);
}

#payment-qr {
  padding: 8px;
  background: white;
}

.auth-dialog {
  width: min(420px, calc(100% - 32px));
  padding: 0;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-panel);
  background: var(--product-panel);
  color: var(--product-text);
  box-shadow: var(--product-shadow-float);
}

.auth-dialog::backdrop {
  background: rgba(28, 25, 21, 0.45);
  backdrop-filter: blur(6px);
}

.dialog-card {
  position: relative;
  display: grid;
  gap: 10px;
  padding: 26px;
}

.dialog-card h2 {
  font-size: 20px;
}

.dialog-card > p:not(.eyebrow, .form-message) {
  color: var(--product-text-muted);
  font-size: 12px;
}

.dialog-card .button {
  margin-top: 8px;
}

.dialog-card > a {
  color: var(--product-accent-hover);
  font-size: 11px;
  text-align: center;
}

.dialog-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  border: 0;
  background: transparent;
  color: var(--product-text-muted);
  cursor: pointer;
  font-size: 22px;
}

.toast-region {
  position: fixed;
  top: 18px;
  left: 50%;
  z-index: 200;
  display: grid;
  gap: 8px;
  width: min(420px, calc(100% - 32px));
  transform: translateX(-50%);
}

.toast {
  padding: 12px 14px;
  border: 1px solid var(--product-border-strong);
  border-radius: var(--product-radius-control);
  background: var(--product-panel-raised);
  box-shadow: var(--product-shadow-float);
  font-size: 12px;
}

.toast.is-error {
  border-color: rgba(184, 68, 42, 0.55);
}

@media (max-width: 1180px) {
  .studio-shell {
    grid-template-columns: 216px minmax(0, 1fr);
  }
  .activity-rail {
    display: none;
  }
}

@media (max-width: 900px) {
  body {
    overflow: auto;
  }
  .nav-drawer-toggle {
    display: inline-flex;
    position: fixed;
    z-index: 30;
    top: 10px;
    left: 10px;
    border: 1px solid var(--product-border);
    background: var(--product-panel-raised);
    color: inherit;
    border-radius: 999px;
    padding: 8px 12px;
  }
  .studio-shell {
    display: block;
    height: auto;
  }
  .studio-nav {
    position: fixed;
    z-index: 28;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(280px, 86vw);
    transform: translateX(-105%);
    transition: transform 160ms ease;
    max-height: none;
    border-right: 1px solid var(--product-border);
    border-bottom: 0;
  }
  body.nav-open .studio-nav {
    transform: translateX(0);
  }
  body.nav-open .nav-drawer-mask {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 27;
    background: rgba(28, 25, 21, 0.40);
  }
  .workspace,
  .activity-rail {
    overflow: visible;
    height: auto;
  }
  .workspace-panel {
    width: min(100% - 28px, 760px);
  }
  .professional-grid,
  .sound-layout,
  .chip-grid,
  .entry-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .studio-shell {
    display: block;
  }
  .workspace-header {
    min-height: 70px;
    padding: 12px 14px;
  }
  .workspace-header h1 {
    font-size: 17px;
  }
  .credit-button span {
    display: none;
  }
  .mode-tabs {
    grid-template-columns: 1fr;
  }
  .mode-tab {
    min-height: 58px;
  }
  .mode-pane {
    min-height: 0;
    padding: 14px;
  }
  .compact-grid,
  .sku-grid {
    grid-template-columns: 1fr;
  }
  .generation-bar {
    align-items: stretch;
    flex-direction: column;
  }
  #generate-button {
    width: 100%;
  }
  .library-card {
    grid-template-columns: 1fr;
  }
}

.choice-row,
.radio-row,
.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.big-action {
  display: grid;
  flex: 1 1 180px;
  gap: 4px;
  min-height: 64px;
  padding: 12px 14px;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-control);
  background: var(--product-panel);
  cursor: pointer;
  text-align: left;
}

.big-action small,
.entry-card small,
.sku-card small {
  color: var(--product-text-muted);
  font-size: 12px;
}

.chip-grid {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 6px;
  margin-top: 12px;
}

.chip-grid .style-chip {
  min-height: 32px;
  padding: 0 6px;
  font-size: 12px;
}

.field-tools {
  display: flex;
  gap: 8px;
  align-items: center;
}

.icon-text {
  min-height: 32px;
  padding: 0 10px;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-control);
  background: transparent;
  cursor: pointer;
  color: var(--product-text-secondary);
  font-size: 12px;
}

.help-copy {
  margin: 8px 0 0;
  color: var(--product-text-muted);
  font-size: 12px;
  line-height: 1.5;
}

.check-row,
.radio-row label {
  display: flex;
  gap: 8px;
  align-items: center;
  margin: 0;
  font-weight: 500;
}

.check-row input,
.radio-row input {
  width: auto;
  height: auto;
}

.more-options {
  margin-top: 12px;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-panel);
  background: var(--product-panel-muted);
}

.more-options summary {
  padding: 12px 14px;
  cursor: pointer;
  font-size: 13px;
}

.more-options .more-body {
  display: grid;
  gap: 12px;
  padding: 0 14px 14px;
}

.entry-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.entry-card {
  display: grid;
  gap: 6px;
  min-height: 140px;
  padding: 22px;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-panel);
  background: var(--product-panel);
  text-align: left;
  cursor: pointer;
}

.entry-card strong {
  font-size: 18px;
}

.work-card,
.library-card {
  display: grid;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-control);
  background: var(--product-panel-muted);
}

.work-card.is-selected {
  border-color: var(--line-strong);
  box-shadow: inset 3px 0 0 var(--brass);
}

.work-card h3,
.library-card h3 {
  margin: 0;
  font-size: 13px;
}

/* C1b：我的作品迁入主区下方 3 列网格（样板 .works/.grid/.w-card） */
.main-works {
  margin-top: 28px;
}
.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
@media (max-width: 1100px) {
  .works-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .works-grid { grid-template-columns: 1fr; }
}
.main-work-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-panel);
  background: var(--product-panel);
}
.main-work-card .mw-cover {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  flex: none;
  background: var(--product-panel-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--product-text-muted);
  font-size: 10px;
}
.main-work-card .mw-meta { flex: 1; min-width: 0; }
.main-work-card .mw-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--product-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.main-work-card .mw-sub {
  font-size: 11px;
  color: var(--product-text-muted);
}
.main-work-card .mw-play {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--product-border);
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--product-text-secondary);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}
.main-work-card .mw-play:hover {
  border-color: var(--brass);
  color: var(--brass);
}
.main-work-card .mw-play svg { width: 14px; height: 14px; }

.pager {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-top: 8px;
}

.rail-tools {
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
}

.slider-row {
  display: grid;
  grid-template-columns: 88px 1fr 42px;
  gap: 8px;
  align-items: center;
  font-size: 12px;
}

.slider-row input[type="range"] {
  padding: 0;
  background: transparent;
}

.player {
  position: relative;
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
}

.player audio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.player-play {
  min-height: 32px;
  border: 1px solid var(--product-border-strong);
  border-radius: var(--product-radius-control);
  background: var(--product-panel);
  cursor: pointer;
}

.player-time {
  color: var(--product-text-muted);
  font: 11px/1 var(--product-font-mono);
}

.timing-canvas {
  width: 100%;
  height: 92px;
  border: 1px solid var(--product-border);
  border-radius: var(--product-radius-control);
  background: var(--product-canvas);
}

.result-box {
  min-height: 120px;
  white-space: pre-wrap;
}

#lyrics-result {
  min-height: 400px;
}