/* ============= ChromaStage — Beautiful UI ============= */
:root {
  --bg-0: #0a0e27;
  --bg-1: #1a1a2e;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-2: rgba(255, 255, 255, 0.07);
  --line: rgba(255, 255, 255, 0.10);
  --text: #ffffff;
  --muted: #b8b8d4;
  --primary: #667eea;
  --primary-2: #764ba2;
  --accent: #f093fb;
  --success: #43e97b;
  --warning: #ffa500;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Prompt", "Noto Sans Thai", system-ui, sans-serif;
  background: linear-gradient(135deg, var(--bg-0) 0%, var(--bg-1) 100%);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  pointer-events: none;
  z-index: 0;
}
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.5;
  animation: float 20s ease-in-out infinite;
}
.blob-1 { width: 500px; height: 500px; background: #667eea; top: -100px; left: -100px; }
.blob-2 { width: 600px; height: 600px; background: #f093fb; bottom: -150px; right: -150px; animation-delay: -7s; }
.blob-3 { width: 400px; height: 400px; background: #43e97b; top: 30%; right: 20%; animation-delay: -14s; opacity: 0.25; }

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(50px, -50px) scale(1.1); }
  66% { transform: translate(-30px, 30px) scale(0.95); }
}

.hero-inner {
  position: relative; z-index: 1;
  max-width: 880px;
  text-align: center;
  animation: fadeUp 0.8s ease-out;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 100px;
  font-size: 13px;
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.hero-title {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  margin: 0 0 24px;
  letter-spacing: -0.02em;
}
.gradient-text {
  background: linear-gradient(135deg, #667eea 0%, #f093fb 50%, #43e97b 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.hero-subtitle {
  font-size: 18px;
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.7;
}
.hero-subtitle strong { color: var(--text); font-weight: 600; }

.hero-cta {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-bottom: 60px;
  flex-wrap: wrap;
}

.hero-demo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 30px;
}
.demo-step {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 20px;
  min-width: 120px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform .2s;
}
.demo-step:hover { transform: translateY(-4px); }
.demo-step.demo-result {
  background: linear-gradient(135deg, rgba(67,233,123,0.2), rgba(102,126,234,0.2));
  border-color: rgba(67,233,123,0.4);
}
.demo-num {
  font-size: 24px;
  font-weight: 700;
  background: linear-gradient(135deg, #667eea, #f093fb);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.demo-label {
  font-size: 13px;
  color: var(--muted);
  margin-top: 4px;
}
.demo-arrow {
  font-size: 22px;
  color: var(--primary);
  font-weight: 300;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  border-radius: 12px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: all .15s;
  font-family: inherit;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.btn:hover { background: var(--panel-2); transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border: none;
  color: white;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(102, 126, 234, 0.4);
}
.btn-primary:hover { box-shadow: 0 12px 32px rgba(102, 126, 234, 0.6); }
.btn-ghost { background: transparent; }
.btn-lg { padding: 16px 32px; font-size: 16px; }
.btn-xl { padding: 20px 48px; font-size: 18px; }
.btn-sm { padding: 6px 12px; font-size: 12px; }

.link-btn {
  background: none;
  border: none;
  color: var(--primary);
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
  font-family: inherit;
  font-size: inherit;
  padding: 0;
}
.link-btn:hover { color: var(--accent); }

/* ===== Mode tabs (TOP LEVEL) ===== */
.mode-tabs-wrap {
  margin-bottom: 32px;
}
.mode-tabs-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 12px 4px;
  text-align: center;
}
.mode-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.mode-tab {
  position: relative;
  background: var(--panel);
  border: 2px solid var(--line);
  border-radius: 20px;
  padding: 28px 24px;
  cursor: pointer;
  transition: all .2s;
  text-align: center;
  font-family: inherit;
  color: var(--text);
}
.mode-tab:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  background: var(--panel-2);
}
.mode-tab.active {
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(240, 147, 251, 0.2));
  box-shadow: 0 8px 32px rgba(102, 126, 234, 0.4);
}
.mode-tab-icon { font-size: 48px; margin-bottom: 8px; }
.mode-tab-title { font-size: 22px; font-weight: 700; margin-bottom: 8px; }
.mode-tab-desc { font-size: 13px; color: var(--muted); line-height: 1.5; }
.mode-tab.active .mode-tab-desc { color: var(--text); }