:root {
  color-scheme: light;
  --bg: #f4f1ea;
  --bg-accent: #e9f0f4;
  --panel: rgba(255, 255, 255, 0.82);
  --panel-border: rgba(18, 24, 38, 0.1);
  --text: #16202a;
  --muted: #607080;
  --accent: #0f7c75;
  --accent-strong: #0a5f5a;
  --accent-soft: rgba(15, 124, 117, 0.12);
  --shadow: 0 24px 70px rgba(16, 24, 40, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(15, 124, 117, 0.12), transparent 34%),
    radial-gradient(circle at top right, rgba(244, 180, 0, 0.14), transparent 28%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-accent) 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
  background-image: linear-gradient(rgba(15, 24, 40, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 24, 40, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
}

.app-shell {
  position: relative;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 40px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(280px, 0.9fr);
  gap: 20px;
  align-items: end;
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 12px;
  color: var(--accent-strong);
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.lead {
  max-width: 64ch;
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.hero-card,
.panel {
  border: 1px solid var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.hero-card {
  border-radius: 24px;
  padding: 22px;
  display: grid;
  gap: 8px;
}

.hero-card-label {
  color: var(--muted);
  font-size: 13px;
}

.hero-card strong {
  font-size: 18px;
  line-height: 1.4;
}

.hero-card span:last-child {
  color: var(--muted);
}

.panel {
  border-radius: 28px;
  padding: 22px;
}

.grid-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: 18px;
}

.controls,
.preview {
  display: grid;
  gap: 16px;
}

.control-group,
.preview {
  padding: 18px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(18, 24, 38, 0.08);
}

.group-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.group-header h2 {
  margin: 0;
  font-size: 16px;
}

.group-header span,
.status {
  color: var(--muted);
  font-size: 13px;
}

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

.segmented label,
.preset {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60px;
  border-radius: 18px;
  border: 1px solid rgba(18, 24, 38, 0.12);
  background: rgba(255, 255, 255, 0.88);
  cursor: pointer;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.segmented label:hover,
.preset:hover {
  transform: translateY(-1px);
  border-color: rgba(15, 124, 117, 0.28);
  box-shadow: 0 12px 28px rgba(15, 124, 117, 0.08);
}

.segmented input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.segmented label:has(input:checked),
.preset.active {
  border-color: rgba(15, 124, 117, 0.45);
  background: linear-gradient(180deg, rgba(15, 124, 117, 0.12), rgba(15, 124, 117, 0.04));
  box-shadow: 0 16px 30px rgba(15, 124, 117, 0.12);
}

.actions {
  display: grid;
  gap: 10px;
}

button {
  border: 0;
  border-radius: 16px;
  min-height: 54px;
  padding: 0 18px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, color 0.18s ease;
}

button:hover {
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
}

.primary {
  color: white;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: 0 18px 34px rgba(15, 124, 117, 0.24);
}

.secondary,
.ghost {
  background: rgba(255, 255, 255, 0.95);
  color: var(--text);
  border: 1px solid rgba(18, 24, 38, 0.12);
}

.status {
  margin: 0;
  min-height: 22px;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.preset {
  padding: 16px;
  text-align: left;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
}

.preset strong {
  font-size: 16px;
}

.preset span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

@media (max-width: 960px) {
  .hero,
  .grid-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .app-shell {
    width: min(100% - 18px, 100%);
    padding: 18px 0 28px;
  }

  .panel,
  .hero-card,
  .control-group,
  .preview {
    border-radius: 20px;
  }

  .segmented,
  .preset-grid {
    grid-template-columns: 1fr;
  }

}