:root {
  color-scheme: light;
  --bg: #f3f7fb;
  --surface: #ffffff;
  --surface-soft: #f8fbff;
  --line: #d9e3ef;
  --line-strong: #b8c7da;
  --text: #12213a;
  --muted: #677891;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --teal: #10b981;
  --orange: #f59e0b;
  --violet: #8b5cf6;
  --danger: #c2410c;
  --danger-bg: #fff4ed;
  --ok: #047857;
  --ok-bg: #ecfdf5;
  --warn: #9a5a05;
  --warn-bg: #fff7e6;
  --code: #0b1628;
  --shadow: 0 18px 44px rgba(37, 61, 94, 0.11);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 0, rgba(37, 99, 235, 0.12), transparent 28%),
    radial-gradient(circle at 88% 12%, rgba(16, 185, 129, 0.10), transparent 24%),
    linear-gradient(180deg, #fbfdff 0, var(--bg) 410px, #edf3f9 100%);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  font-size: 14px;
}

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

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

button {
  min-height: 38px;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0 15px;
  background: linear-gradient(135deg, var(--primary), #4f7cff);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  filter: brightness(0.97);
}

button:disabled {
  opacity: 0.68;
  cursor: wait;
}

button.secondary,
button.plain {
  background: #fff;
  color: var(--text);
  border-color: var(--line);
}

button.secondary:hover,
button.plain:hover {
  background: #f3f7fb;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  outline: none;
}

input,
select {
  min-height: 42px;
  padding: 8px 11px;
}

textarea {
  min-height: 116px;
  padding: 11px;
  resize: vertical;
  line-height: 1.6;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

label {
  display: grid;
  gap: 8px;
  color: #263650;
  font-weight: 700;
}

label small {
  justify-self: end;
  color: var(--muted);
  font-weight: 500;
}

.hidden {
  display: none !important;
}

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

.app-topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  min-height: 62px;
  display: grid;
  grid-template-columns: auto minmax(260px, 1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 10px 36px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0;
  white-space: nowrap;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: linear-gradient(135deg, #2f80ff, #6aa8ff);
  color: #fff;
  font-size: 15px;
}

.center-nav,
.account {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.center-nav {
  justify-content: center;
}

.account {
  justify-content: flex-end;
}

.center-nav a,
.pill {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.85);
  color: #34445d;
  padding: 0 14px;
  white-space: nowrap;
}

.center-nav a.active,
.pill.status {
  color: var(--primary-dark);
  background: #eef5ff;
}

.pill.credit {
  color: var(--primary-dark);
  background: #eef5ff;
}

.pill.mock {
  color: var(--warn);
  background: var(--warn-bg);
}

.page {
  width: min(1520px, calc(100vw - 64px));
  margin: 0 auto;
  padding: 22px 0 54px;
}

.hero-panel,
.flow-panel,
.panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow);
}

.hero-panel {
  min-height: 180px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) 380px 260px;
  gap: 18px;
  align-items: center;
  padding: 28px 36px;
  overflow: hidden;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--primary);
  font-weight: 900;
}

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

h1 {
  margin-bottom: 14px;
  font-size: clamp(36px, 3.3vw, 54px);
  line-height: 1.1;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: 18px;
}

h3 {
  margin-bottom: 8px;
  font-size: 16px;
}

.hero-copy p:last-child {
  width: min(760px, 100%);
  margin-bottom: 0;
  color: #52647b;
  font-size: 16px;
  line-height: 1.75;
}

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

.hero-metrics div {
  min-height: 70px;
  display: grid;
  align-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 12px 14px;
}

.hero-metrics span {
  color: var(--muted);
}

.hero-metrics strong {
  margin-top: 4px;
  font-size: 18px;
}

.toy-scene {
  min-height: 128px;
  display: grid;
  place-items: center;
}

.toy-stage {
  position: relative;
  width: 230px;
  height: 126px;
  border-radius: 50%;
  background: linear-gradient(180deg, #f6fbff, #dde8f5);
  box-shadow: 0 22px 36px rgba(47, 80, 130, 0.16);
}

.toy-bear,
.toy-house,
.toy-block,
.toy-ball {
  position: absolute;
  display: block;
}

.toy-bear {
  left: 30px;
  bottom: 32px;
  width: 52px;
  height: 62px;
  border-radius: 48% 48% 42% 42%;
  background: #eab37b;
}

.toy-bear::before,
.toy-bear::after {
  content: "";
  position: absolute;
  top: -10px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #d99b62;
}

.toy-bear::before { left: -6px; }
.toy-bear::after { right: -6px; }

.toy-house {
  right: 36px;
  bottom: 32px;
  width: 74px;
  height: 70px;
  border-radius: 8px;
  background: #ffd8b3;
  border: 6px solid #f6a46d;
}

.toy-house::before {
  content: "";
  position: absolute;
  left: 6px;
  top: -34px;
  width: 52px;
  height: 52px;
  transform: rotate(45deg);
  background: #ffb37f;
  border-radius: 8px 8px 0 8px;
}

.toy-block {
  bottom: 24px;
  width: 26px;
  height: 26px;
  border-radius: 6px;
}

.block-a { left: 112px; background: #9bd5ff; }
.block-b { left: 146px; background: #ffcf67; }
.toy-ball { width: 18px; height: 18px; border-radius: 50%; bottom: 32px; }
.toy-ball.one { left: 96px; background: #f97316; }
.toy-ball.two { right: 18px; background: #7dd3fc; }

.flow-panel {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 20px;
  align-items: center;
  margin-top: 16px;
  padding: 18px 22px;
}

.flow-title {
  display: grid;
  gap: 6px;
}

.flow-title strong {
  font-size: 18px;
}

.flow-title span,
.flow-steps span,
.rail-steps span,
.panel-head span,
.result-toolbar small,
.side-info p,
.side-info li,
.upload-card small,
.preview-card span,
.mini-preview span {
  color: var(--muted);
}

.flow-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.flow-steps li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
}

.flow-steps i {
  grid-row: span 2;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #edf4ff;
  color: var(--primary);
  font-style: normal;
  font-weight: 900;
}

.flow-steps li.done i,
.flow-steps li.active i {
  background: var(--primary);
  color: #fff;
}

.flow-steps strong,
.rail-steps strong {
  align-self: end;
}

.workspace {
  display: grid;
  grid-template-columns: 286px minmax(0, 1fr) 330px;
  gap: 16px;
  margin-top: 16px;
  align-items: start;
}

.left-rail,
.center-work,
.right-rail,
.stack {
  display: grid;
  gap: 16px;
}

.panel {
  overflow: hidden;
}

.panel-head {
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
}

.panel-body {
  padding: 18px;
}

.button-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.button-row.compact {
  gap: 8px;
}

.button-row.compact button {
  min-height: 34px;
}

.icon-btn {
  width: 30px;
  min-height: 30px;
  padding: 0;
  border-radius: 50%;
}

.notice {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: var(--surface-soft);
  color: var(--muted);
  white-space: pre-wrap;
  line-height: 1.6;
}

.notice.ok {
  color: var(--ok);
  background: var(--ok-bg);
  border-color: #b8e4d2;
}

.notice.warn {
  color: var(--warn);
  background: var(--warn-bg);
  border-color: #efd69b;
}

.notice.error {
  color: var(--danger);
  background: var(--danger-bg);
  border-color: #fecab3;
}

.rail-steps {
  margin: 0;
  padding: 18px;
  list-style: none;
  display: grid;
  gap: 0;
}

.rail-steps li {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  column-gap: 12px;
  row-gap: 4px;
  padding: 0 0 24px;
}

.rail-steps li::after {
  content: "";
  position: absolute;
  left: 21px;
  top: 44px;
  bottom: 0;
  border-left: 1px dashed #c9d8e9;
}

.rail-steps li:last-child {
  padding-bottom: 0;
}

.rail-steps li:last-child::after {
  display: none;
}

.rail-steps i {
  grid-row: span 2;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #eef5ff;
  color: var(--primary);
  font-style: normal;
  font-weight: 900;
}

.rail-steps li.active i,
.rail-steps li.done i {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #6b95ff);
}

.tips {
  margin: 0 18px 18px;
  border: 1px solid #cfe0f5;
  border-radius: 8px;
  background: #f4f9ff;
  padding: 14px;
}

.tips p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.55;
}

.board-form {
  display: grid;
  grid-template-columns: minmax(320px, 0.92fr) minmax(420px, 1.08fr);
  gap: 18px;
  align-items: start;
}

.upload-area,
.config-area {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.upload-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 14px;
  min-width: 0;
}

.upload-top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.upload-icon {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: #eef5ff;
  color: var(--primary);
  font-weight: 900;
}

.preview-card {
  position: relative;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(135deg, #f8fbff, #edf4ff);
  cursor: pointer;
  overflow: hidden;
}

.preview-card {
  min-height: 176px;
}

.preview-card img {
  display: none;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.upload-actions {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.primary-upload > small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.text-btn {
  min-height: auto;
  margin-top: 10px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--primary);
  font-weight: 700;
}

.binding-note,
.result-note {
  border: 1px solid #c6dbff;
  border-radius: 8px;
  background: #f0f6ff;
  color: #1d4ed8;
  padding: 12px;
  line-height: 1.55;
}

.binding-note strong {
  display: block;
  margin-bottom: 4px;
  font-weight: 700;
}

.binding-note p,
.result-note {
  margin: 0;
  font-size: 13px;
}

.result-note {
  margin: 14px 16px 0;
}

.result-panel {
  margin-top: 16px;
}

.result-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

.result-tabs .tab {
  background: transparent;
  color: #52647b;
  border-color: transparent;
  border-radius: 8px;
}

.result-tabs .tab.active {
  background: #eef5ff;
  border-color: #cde0ff;
  color: var(--primary-dark);
}

.result-tabs span {
  margin-left: auto;
  color: var(--muted);
}

.tab-panel {
  display: none;
  padding: 16px;
}

.tab-panel.active {
  display: block;
}

.result-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.result-toolbar strong,
.result-toolbar small {
  display: block;
}

.result-toolbar small {
  margin-top: 5px;
  line-height: 1.45;
}

.prompt-box,
.json-box {
  margin: 0;
  width: 100%;
  border-radius: 8px;
  padding: 18px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.75;
}

.prompt-box {
  min-height: 360px;
  max-height: 680px;
  color: #e9f1ff;
  background:
    linear-gradient(180deg, rgba(37, 99, 235, 0.08), transparent 110px),
    var(--code);
  border: 1px solid #213047;
}

.prompt-box.collapsed {
  max-height: 220px;
}

.json-box {
  max-height: 560px;
  color: #1d2c45;
  background: #f8fbff;
  border: 1px solid var(--line);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.guide-grid div {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: #fff;
}

.guide-grid p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.65;
}

.side-info {
  padding: 18px;
  display: grid;
  gap: 16px;
}

.side-info article {
  border-bottom: 1px solid var(--line);
  padding-bottom: 16px;
}

.side-info article:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
}

.side-info p,
.side-info ul {
  margin: 0;
  line-height: 1.65;
}

.side-info ul {
  padding-left: 18px;
}

.warning-card {
  border: 1px solid #f4cf9b;
  border-radius: 8px;
  padding: 14px;
  background: linear-gradient(135deg, #fff7e6, #fffdf7);
  color: #b45309;
}

.warning-card p {
  margin: 8px 0 0;
  line-height: 1.55;
}

@media (max-width: 1280px) {
  .app-topbar {
    grid-template-columns: 1fr;
  }

  .center-nav,
  .account {
    justify-content: flex-start;
  }

  .hero-panel {
    grid-template-columns: 1fr;
  }

  .toy-scene {
    display: none;
  }

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

@media (max-width: 900px) {
  .page {
    width: min(100vw - 22px, 1520px);
    padding-top: 12px;
  }

  .hero-panel,
  .flow-panel,
  .board-form,
  .guide-grid {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    padding: 22px;
  }

  h1 {
    font-size: 34px;
  }

  .flow-steps {
    grid-template-columns: 1fr;
  }

  .result-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .button-row {
    width: 100%;
  }

  .button-row button {
    flex: 1 1 auto;
  }
}