:root {
  color-scheme: light;
  --bg: #ffffff;
  --text: #161616;
  --muted: #666666;
  --border: #e5e5e5;
  --chip: #f3f3f3;
  --panel: #f5f5f5;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #fff;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

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

.hidden {
  display: none !important;
}

.app-phone {
  width: min(100%, 430px);
  height: 100vh;
  margin: 0 auto;
  display: grid;
  grid-template-rows: 56px minmax(0, 1fr) auto;
  background: #fff;
  overflow: hidden;
}

.top-nav {
  height: 56px;
  padding: 0 16px;
  display: grid;
  grid-template-columns: 40px 1fr 40px;
  align-items: center;
  position: relative;
  z-index: 2;
  background: #fff;
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

.nav-icon {
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-center {
  text-align: center;
}

.nav-title-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 15px;
  font-weight: 700;
}

.nav-subtitle {
  margin-top: 2px;
  font-size: 12px;
  color: var(--muted);
}

.nav-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

.chat-area {
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 12px 0 8px;
  display: flex;
  flex-direction: column;
}

.chat-history,
.result-cards,
.debug-stack,
.timeline-box,
.advanced-grid,
.switch-grid {
  display: grid;
  gap: 12px;
}

.message {
  padding: 0 16px;
  margin-bottom: 12px;
}

.message-card {
  border-radius: 24px;
  padding: 16px;
  background: var(--panel);
}

.user-message {
  display: flex;
  justify-content: flex-end;
}

.user-message .message-card {
  background: #161616;
  color: #fff;
  max-width: 84%;
}

.welcome-message {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.intro-text-block {
  width: 100%;
  padding: 0 32px;
}

.intro-title {
  margin-bottom: 8px;
  font-size: 22px;
  font-weight: 700;
}

.intro-desc,
.muted {
  color: var(--muted);
}

.result-shell {
  background: transparent;
  padding: 0;
}

.result-card,
.panel-block {
  background: #f7f7f7;
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 14px;
}

.result-card h3,
.panel-block h3 {
  margin-bottom: 10px;
}

.media-preview {
  width: 100%;
  display: block;
  border-radius: 14px;
  margin-bottom: 10px;
}

.result-card a {
  color: #2563eb;
}

.debug-drawer,
.details-block,
.advanced-drawer {
  margin: 0 16px 12px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #fafafa;
  overflow: hidden;
}

.debug-drawer summary,
.details-block summary,
.advanced-drawer summary {
  padding: 14px 16px;
  cursor: pointer;
  font-weight: 600;
}

.summary-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.summary-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 10px 12px;
}

.summary-item span {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.timeline-item {
  border-left: 3px solid #161616;
  padding-left: 10px;
}

.timeline-meta {
  margin-top: 6px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
}

pre {
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  padding: 12px;
  background: #fff;
  border-radius: 14px;
  border: 1px solid var(--border);
  font-size: 12px;
}

.bottom-dock {
  background: #fff;
  padding: 8px 16px calc(12px + env(safe-area-inset-bottom));
  position: relative;
  z-index: 2;
  border-top: 1px solid rgba(0, 0, 0, 0.04);
}

.quick-bar {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 10px;
}

.quick-chip {
  border: none;
  background: var(--chip);
  color: var(--text);
  border-radius: 16px;
  padding: 10px 14px;
  white-space: nowrap;
  font-size: 14px;
  font-weight: 600;
}

.quick-chip.active {
  background: #161616;
  color: #fff;
}

.composer-box {
  background: var(--panel);
  border-radius: 24px;
  padding: 14px;
}

.top-action-sheet,
.tool-sheet {
  margin: 0 16px 12px;
  display: grid;
  gap: 10px;
}

.sheet-action,
.tool-sheet-btn {
  width: 100%;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 16px;
  padding: 12px 14px;
  text-align: left;
  color: var(--text);
  font-size: 14px;
}

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

.image-upload-strip {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.upload-chip {
  min-width: 84px;
  padding: 10px 14px;
  border-radius: 16px;
  background: #fff;
  border: 1px solid var(--border);
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.upload-preview-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.upload-preview-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 10px;
}

.upload-preview-label {
  margin-bottom: 8px;
  font-size: 12px;
  color: var(--muted);
}

.upload-preview-card img {
  width: 100%;
  display: block;
  border-radius: 12px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.composer-input,
input,
select,
textarea {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
}

.composer-input {
  min-height: 32px;
  resize: none;
  font-size: 16px;
  line-height: 1.5;
}

.advanced-grid label,
.mini-select {
  display: grid;
  gap: 8px;
}

.advanced-grid span,
.mini-select span {
  font-size: 12px;
  color: var(--muted);
}

.advanced-grid input,
.advanced-grid select,
.advanced-grid textarea,
.mini-select select {
  background: #fff;
  border-radius: 16px;
  padding: 12px 14px;
}

.switch-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 12px;
}

.switch-grid label {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border-radius: 16px;
  padding: 12px 14px;
}

.switch-grid input {
  width: auto;
}

.composer-actions {
  margin-top: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.round-btn {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 999px;
  background: #fff;
  color: var(--text);
  font-size: 22px;
}

.send-btn {
  background: #161616;
  color: #fff;
}

@media (max-width: 420px) {
  .summary-board,
  .switch-grid {
    grid-template-columns: 1fr;
  }
}