:root {
  color-scheme: light;
  --bg: #f7f9f8;
  --surface: #ffffff;
  --surface-soft: #f2f7f6;
  --ink: #16232d;
  --muted: #65727f;
  --line: #dce4e5;
  --line-strong: #b8cbcc;
  --teal: #168b8f;
  --teal-dark: #0f6e72;
  --coral: #ff6b5f;
  --coral-dark: #e4564c;
  --shadow: 0 18px 45px rgba(21, 43, 45, 0.08);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--ink);
}

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

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

svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto auto;
  align-items: center;
  gap: 18px;
  height: 64px;
  padding: 0 24px;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-size: 20px;
  font-weight: 760;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  color: var(--teal);
}

.topnav {
  display: flex;
  gap: 8px;
}

.topnav a,
.ghost-button,
.download-link,
.tab {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  font-weight: 650;
}

.topnav a:hover,
.ghost-button:hover,
.download-link:hover,
.tab:hover {
  border-color: var(--line-strong);
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  justify-self: end;
  padding: 9px 12px;
  border: 1px solid #cbe7e4;
  border-radius: 8px;
  background: #effaf8;
  color: var(--teal-dark);
  font-size: 13px;
  font-weight: 700;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #19a974;
}

.app-shell {
  width: min(1540px, calc(100% - 32px));
  margin: 16px auto 28px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(340px, 0.9fr) minmax(480px, 1.5fr);
  gap: 12px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.upload-panel,
.text-panel,
.history {
  padding: 22px;
}

.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 16px;
}

.panel-head.compact {
  align-items: center;
}

.step {
  margin: 0 0 4px;
  color: var(--teal-dark);
  font-size: 14px;
  font-weight: 760;
}

h1,
h2 {
  margin: 0;
  font-size: 20px;
  line-height: 1.25;
  letter-spacing: 0;
}

.mini-badge {
  flex: 0 0 auto;
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.dropzone {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 4px 14px;
  min-height: 108px;
  padding: 20px;
  border: 1.5px dashed var(--teal);
  border-radius: 8px;
  background: #fbfefd;
  cursor: pointer;
}

.dropzone.dragover {
  background: #edf9f8;
  border-color: var(--coral);
}

.dropzone input,
.file-tab input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.file-icon {
  grid-row: span 2;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  color: var(--teal);
}

.dropzone strong {
  align-self: end;
  font-size: 16px;
}

.dropzone span:last-child {
  color: var(--muted);
  font-size: 14px;
}

.wave-card {
  display: grid;
  grid-template-columns: 44px 1fr;
  align-items: center;
  gap: 10px;
  margin: 14px 0 18px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

#waveform {
  width: 100%;
  height: 96px;
}

.icon-button,
.play-output {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 50%;
  background: var(--teal);
  color: #fff;
  cursor: pointer;
}

.icon-button:disabled,
.play-output:disabled {
  background: #b8c7c9;
  cursor: not-allowed;
}

.field,
.setting {
  display: grid;
  gap: 8px;
}

.field span,
.setting label {
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
}

input[type="text"],
input[type="password"],
input[type="url"],
input[type="search"],
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  outline: none;
}

input[type="text"],
input[type="password"],
input[type="url"],
input[type="search"],
select {
  height: 42px;
  padding: 0 12px;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(22, 139, 143, 0.14);
}

.check-row {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 10px;
  margin-top: 18px;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.55;
}

.check-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--teal);
}

.privacy-note {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
  padding: 14px;
  border: 1px solid #bfe2df;
  border-radius: 8px;
  background: #effaf8;
  color: var(--teal-dark);
  font-size: 14px;
  font-weight: 650;
}

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 0;
}

.tab {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
  cursor: pointer;
}

.tab.active {
  border-color: #bfe2df;
  background: #effaf8;
  color: var(--teal-dark);
}

.editor-wrap {
  position: relative;
  display: block;
}

textarea {
  min-height: 188px;
  padding: 18px;
  resize: vertical;
  border-top-left-radius: 0;
  line-height: 1.7;
}

#charCount {
  position: absolute;
  right: 14px;
  bottom: 12px;
  color: var(--muted);
  font-size: 13px;
}

.settings {
  display: grid;
  grid-template-columns: 1.1fr 1.1fr repeat(3, 1fr);
  gap: 14px;
  margin: 16px 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfc;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--teal);
}

.provider-config {
  display: grid;
  gap: 12px;
  margin-bottom: 16px;
}

.provider-note {
  padding: 12px 14px;
  border: 1px solid #bfe2df;
  border-radius: 8px;
  background: #effaf8;
  color: var(--teal-dark);
  font-size: 14px;
  line-height: 1.55;
}

.provider-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfc;
}

.provider-grid .wide {
  grid-column: 1 / -1;
}

.provider-grid textarea {
  min-height: 86px;
  border-radius: 8px;
  line-height: 1.45;
}

.hidden {
  display: none !important;
}

.result-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 14px;
}

.player-wrap {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: center;
  gap: 12px;
  min-height: 58px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

#outputAudio {
  width: 100%;
  min-width: 160px;
}

.download-link.disabled {
  pointer-events: none;
  color: #a9b4bb;
  background: #f5f7f7;
}

.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-width: 150px;
  min-height: 56px;
  padding: 0 22px;
  border: 0;
  border-radius: 8px;
  background: var(--coral);
  color: #fff;
  cursor: pointer;
  font-weight: 800;
  box-shadow: 0 14px 28px rgba(255, 107, 95, 0.22);
}

.primary-button:hover {
  background: var(--coral-dark);
}

.primary-button:disabled {
  background: #c1c9ca;
  box-shadow: none;
  cursor: not-allowed;
}

.message {
  min-height: 22px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.message.error {
  color: #b42318;
}

.message.success {
  color: var(--teal-dark);
}

.history {
  margin-top: 12px;
}

.history-actions {
  display: flex;
  gap: 10px;
}

.history-actions input {
  width: 260px;
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  font-size: 14px;
}

th {
  background: #fbfcfc;
  color: #35434e;
  font-weight: 760;
}

td {
  color: #344350;
}

tr:last-child td {
  border-bottom: 0;
}

.row-actions {
  display: flex;
  gap: 8px;
}

.small-action {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}

.empty-row {
  color: var(--muted);
  text-align: center;
}

@media (max-width: 980px) {
  .topbar {
    grid-template-columns: 1fr auto;
    height: auto;
    padding: 12px 16px;
  }

  .topnav {
    display: none;
  }

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

  .settings,
  .provider-grid,
  .result-row {
    grid-template-columns: 1fr;
  }

  .primary-button {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .app-shell {
    width: min(100% - 16px, 1540px);
    margin-top: 8px;
  }

  .topbar {
    gap: 10px;
  }

  .brand {
    font-size: 17px;
  }

  .status {
    font-size: 12px;
    padding: 8px 10px;
  }

  .upload-panel,
  .text-panel,
  .history {
    padding: 16px;
  }

  .panel-head,
  .panel-head.compact {
    display: grid;
  }

  .history-actions,
  .player-wrap {
    display: grid;
    grid-template-columns: 1fr;
    width: 100%;
  }

  .history-actions input {
    width: 100%;
  }

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

  .file-icon {
    grid-row: auto;
  }
}