:root {
  color-scheme: light;
  --bg: #f6f3ed;
  --surface: #fffdf8;
  --surface-strong: #ffffff;
  --ink: #1d2528;
  --muted: #647174;
  --line: #ddd5c8;
  --accent: #116b68;
  --accent-strong: #0b5452;
  --accent-soft: #dff1ee;
  --warn: #8a4b10;
  --shadow: 0 18px 46px rgba(29, 37, 40, 0.08);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

button {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-strong);
  color: var(--ink);
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

button:hover:not(:disabled) {
  border-color: var(--accent);
}

button:active:not(:disabled) {
  transform: translateY(1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

[hidden] {
  display: none !important;
}

h1,
h2,
h3,
p {
  margin: 0;
}

.app-shell {
  min-height: 100vh;
  padding-bottom: 76px;
}

.main-area {
  width: min(100%, 920px);
  margin: 0 auto;
  padding: 16px;
  display: grid;
  gap: 16px;
}

.side-nav {
  display: none;
}

.bottom-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.96);
  backdrop-filter: blur(16px);
}

.nav-item {
  padding: 0 12px;
  font-weight: 800;
}

.nav-item.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.settings-panel,
.feature-card,
.output-panel,
.history-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.settings-panel,
.feature-card,
.output-panel {
  padding: 16px;
}

.history-panel {
  padding: 14px;
}

.settings-panel {
  display: grid;
  gap: 12px;
}

.auth-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.auth-panel #auth-status,
.quota-status {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.35;
}

.quota-status {
  margin-top: 2px;
}

.auth-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.auth-actions button {
  min-height: 38px;
  padding: 0 12px;
  font-size: 0.9rem;
  font-weight: 800;
}

.language-toggle,
.font-toggle,
.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.language-option,
.font-option,
.action-row button,
#clear-history {
  min-height: 38px;
  padding: 0 12px;
  font-size: 0.9rem;
}

.language-option.active,
.font-option.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-strong);
  font-weight: 800;
}

.history-search {
  display: block;
  margin-bottom: 12px;
}

.history-search input {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
}

.history-search input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.tts-controls {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.tts-controls label {
  display: grid;
  gap: 6px;
  min-width: 0;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 750;
}

.tts-controls label span {
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.tts-controls select,
.tts-controls input[type="range"] {
  width: 100%;
}

.tts-controls select {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
  background: var(--surface-strong);
  color: var(--ink);
}

.tts-controls output {
  color: var(--ink);
  font-weight: 800;
}

.feature-page {
  display: none;
  gap: 16px;
}

.feature-page.active {
  display: grid;
}

.eyebrow {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.feature-card h2 {
  font-size: clamp(2rem, 8vw, 4.25rem);
  line-height: 0.96;
  margin-bottom: 18px;
}

.input-label {
  display: block;
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 800;
}

textarea {
  width: 100%;
  min-height: 142px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 13px;
  background: var(--surface-strong);
  color: var(--ink);
  line-height: 1.5;
}

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

.character-counter {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 750;
  text-align: right;
}

.character-counter.warning {
  color: var(--warn);
}

.character-counter.over-limit {
  color: #9f1d1d;
}

.go-button {
  width: 100%;
  margin-top: 12px;
  min-height: 52px;
  background: var(--accent);
  border-color: var(--accent);
  color: white;
  font-weight: 850;
}

.go-button:hover:not(:disabled) {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

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

.panel-header h3 {
  font-size: 1.05rem;
  line-height: 1.2;
}

.status {
  min-height: 22px;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.9rem;
}

.status.error {
  color: var(--warn);
}

.empty-state {
  color: var(--muted);
}

.markdown-output {
  min-height: 180px;
  padding-top: 4px;
  line-height: 1.62;
  overflow-wrap: anywhere;
}

.markdown-output h1,
.markdown-output h2,
.markdown-output h3 {
  margin: 18px 0 8px;
  line-height: 1.25;
}

.markdown-output h1:first-child,
.markdown-output h2:first-child,
.markdown-output h3:first-child {
  margin-top: 0;
}

.markdown-output h1 {
  font-size: 1.55rem;
}

.markdown-output h2 {
  font-size: 1.14rem;
}

.markdown-output h3 {
  font-size: 1rem;
}

.markdown-output p {
  margin: 8px 0;
}

.markdown-output .markdown-indent {
  margin: 3px 0 3px 1.75rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--line);
  color: var(--muted);
  font-size: 0.95em;
}

.markdown-output ul,
.markdown-output ol {
  margin: 8px 0 12px;
  padding-left: 22px;
}

.markdown-output blockquote {
  margin: 10px 0;
  padding: 8px 12px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
}

.markdown-output hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 16px 0;
}

.tts-unit {
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  margin-right: 2px;
}

.tts-button {
  width: 30px;
  min-height: 30px;
  border-radius: 8px;
  padding: 0;
  line-height: 1;
  vertical-align: baseline;
}

.thai-looped .thai-text {
  font-family: inherit;
}

.thai-loopless .thai-text {
  font-family: "Noto Sans Thai", "Avenir Next", Arial, sans-serif;
  font-size: 1em;
  font-weight: 500;
}

.history-list {
  display: grid;
  gap: 10px;
}

.history-month {
  display: grid;
  gap: 8px;
}

.history-month + .history-month {
  margin-top: 6px;
}

.history-month-title {
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 4px 0;
}

.history-item {
  width: 100%;
  min-height: auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  align-items: stretch;
  padding: 0;
  background: var(--surface-strong);
}

.history-load {
  min-height: auto;
  border: 0;
  padding: 12px;
  text-align: left;
  background: transparent;
}

.history-load:hover:not(:disabled) {
  border-color: transparent;
}

.history-delete {
  align-self: center;
  min-height: 36px;
  margin-right: 10px;
  padding: 0 10px;
  color: var(--warn);
  font-size: 0.82rem;
  font-weight: 800;
}

.history-title {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 4px;
  font-weight: 800;
}

.history-meta,
.history-preview {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.35;
}

@media (min-width: 760px) {
  .app-shell {
    display: grid;
    grid-template-columns: 220px 1fr;
    padding-bottom: 0;
  }

  .side-nav {
    position: sticky;
    top: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 100vh;
    padding: 20px 14px;
    border-right: 1px solid var(--line);
    background: var(--surface);
  }

  .brand {
    margin-bottom: 12px;
  }

  .brand h1 {
    font-size: 1.18rem;
    line-height: 1.15;
  }

  .brand p {
    margin-top: 4px;
    color: var(--muted);
    font-size: 0.9rem;
  }

  .side-nav .nav-item {
    justify-content: flex-start;
    text-align: left;
  }

  .bottom-nav {
    display: none;
  }

  .main-area {
    width: min(100%, 980px);
    margin: 0;
    padding: 24px;
  }

  .settings-panel,
  .feature-card,
  .output-panel {
    padding: 20px;
  }

  .settings-panel {
    grid-template-columns: auto auto 1fr;
    align-items: start;
  }

  .auth-panel {
    grid-column: 1 / -1;
  }

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