:root {
  --bg: #f4f8ff;
  --panel: rgba(255, 255, 255, 0.82);
  --line: rgba(34, 54, 96, 0.15);
  --text: #1f2d53;
  --sub: #5970a5;
  --primary: #3f7cff;
  --secondary: #19b8ff;
  --ok: #42d392;
}

[data-theme="sky"] {
  --primary: #3f7cff;
  --secondary: #19b8ff;
}

[data-theme="mint"] {
  --primary: #17b486;
  --secondary: #5fd3a5;
}

[data-theme="peach"] {
  --primary: #ff9256;
  --secondary: #ffb178;
}

[data-theme="lavender"] {
  --primary: #8f77ff;
  --secondary: #b69cff;
}

[data-theme="sunny"] {
  --primary: #ffb028;
  --secondary: #ffd34d;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at 20% 10%, #ffffff, var(--bg) 56%);
  color: var(--text);
}

.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(circle at center, black 40%, transparent 100%);
  z-index: 0;
  opacity: 0.55;
}

.bg-glow {
  position: fixed;
  width: 46vw;
  height: 46vw;
  max-width: 600px;
  max-height: 600px;
  right: -120px;
  top: -80px;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--primary), transparent 30%), transparent 70%);
  filter: blur(30px);
  opacity: 0.45;
  pointer-events: none;
  z-index: 0;
}

.topbar,
main,
.footer {
  position: relative;
  z-index: 1;
}

.topbar {
  max-width: 1200px;
  margin: 0 auto;
  padding: 22px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  letter-spacing: 1px;
  font-weight: 700;
}

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

.theme-btn {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
  color: var(--text);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 12px;
  cursor: pointer;
}

.theme-btn.active {
  background: linear-gradient(120deg, var(--primary), var(--secondary));
  color: #ffffff;
  border-color: transparent;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px 24px 48px;
}

.hero {
  padding: 48px 0 28px;
}

.badge {
  display: inline-block;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--secondary);
  font-size: 12px;
  letter-spacing: 1px;
}

h1 {
  margin: 14px 0 0;
  font-size: clamp(32px, 5.2vw, 62px);
  line-height: 1.12;
}

.desc {
  margin-top: 18px;
  color: var(--sub);
  max-width: 760px;
  line-height: 1.7;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  gap: 12px;
}

.solid-btn,
.ghost-btn {
  border-radius: 12px;
  padding: 10px 18px;
  text-decoration: none;
  border: 1px solid var(--line);
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  transition: 0.2s ease;
}

.solid-btn {
  background: linear-gradient(120deg, var(--primary), var(--secondary));
  border-color: transparent;
  color: #ffffff;
  font-weight: 700;
}

.solid-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px color-mix(in srgb, var(--secondary), transparent 65%);
}

.ghost-btn {
  background: rgba(255, 255, 255, 0.66);
}

.ghost-btn:hover {
  background: rgba(255, 255, 255, 0.9);
}

.features {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
  backdrop-filter: blur(10px);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--secondary), white 20%);
}

.lab-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 14px;
}

.card.big {
  min-height: 170px;
}

.pulse-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.metric {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.5);
}

.metric-label {
  display: block;
  color: var(--sub);
  font-size: 12px;
}

.metric-value {
  display: block;
  margin-top: 4px;
  font-size: 26px;
  font-weight: 700;
  color: var(--secondary);
}

.card h3 {
  margin: 0;
}

.card p {
  margin: 10px 0 0;
  color: var(--sub);
  line-height: 1.6;
}

.studio {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  backdrop-filter: blur(8px);
}

.panel h2 {
  margin-top: 0;
}

.hint {
  margin-top: -8px;
  color: var(--sub);
  font-size: 13px;
}

form {
  display: grid;
  gap: 12px;
}

.form-block {
  margin-top: 8px;
}

label {
  display: grid;
  gap: 6px;
  font-size: 13px;
}

input,
textarea,
select {
  width: 100%;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text);
  padding: 10px 12px;
  outline: none;
}

input:focus,
textarea:focus {
  border-color: var(--secondary);
}

.full {
  width: 100%;
  border: 0;
  padding: 12px;
}

.output-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.status {
  font-size: 12px;
  color: var(--secondary);
}

#resultBox {
  margin-top: 8px;
  min-height: 420px;
  max-height: 520px;
  overflow: auto;
  white-space: pre-wrap;
  line-height: 1.7;
  color: #29407a;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
}

.image-box {
  min-height: 420px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.88);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  color: var(--sub);
}

.image-box img {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
  border-radius: 10px;
}

.image-actions {
  margin-top: 10px;
  display: flex;
  gap: 10px;
}

.image-actions a {
  color: color-mix(in srgb, var(--primary), #234486 25%);
  font-size: 13px;
}

.footer {
  text-align: center;
  color: var(--sub);
  padding: 28px;
}

@media (max-width: 980px) {
  .features,
  .studio,
  .lab-grid,
  .pulse-grid {
    grid-template-columns: 1fr;
  }

  .toolbar {
    flex-wrap: wrap;
    justify-content: flex-end;
  }
}