:root {
  --bg-black: #050608;
  --text-primary: #FFFFFF;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-dim: rgba(255, 255, 255, 0.4);
  --accent-cyan: #00F2FF;
  --accent-purple: #B026FF;
  --border-glass: rgba(255, 255, 255, 0.1);
  --glass-bg: rgba(255, 255, 255, 0.03);
  --font-title: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: var(--bg-black);
  color: var(--text-primary);
  font-family: var(--font-body);
  overflow-x: hidden;
  line-height: 1.6;
}

/* 渐变装饰背景 (Grainy Gradient Overlay) */
.bg-vibe {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: radial-gradient(circle at 20% 30%, rgba(0, 242, 255, 0.05) 0%, transparent 40%),
              radial-gradient(circle at 80% 70%, rgba(176, 38, 255, 0.05) 0%, transparent 40%);
  pointer-events: none;
}

/* 全屏扫描线动效 (Cyber HUD Scanline) */
.scanline {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: linear-gradient(to bottom, transparent 95%, rgba(0, 242, 255, 0.03) 100%);
  background-size: 100% 4px;
  animation: scan 60s linear infinite;
  pointer-events: none;
  z-index: 9999;
}

@keyframes scan {
  from { background-position: 0 0; }
  to { background-position: 0 100%; }
}

/* Typography */
h1, h2, h3 {
  font-family: var(--font-title);
  letter-spacing: -0.02em;
  font-weight: 900;
}

.text-gradient {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Layout Containers */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 120px 0;
  position: relative;
}

/* Outcomes Gallery */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 60px;
}

.gallery-item {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  height: 240px;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}

.gallery-item:hover img {
  transform: scale(1.1);
}

.gallery-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(5,6,8,0.9), transparent);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 24px;
  opacity: 1;
}

/* FAQ Accordion */
.faq-container {
  max-width: 800px;
  margin: 80px auto 0;
}

.faq-item {
  margin-bottom: 12px;
  border: 1px solid var(--border-glass);
  border-radius: 12px;
  overflow: hidden;
  background: var(--glass-bg);
}

.faq-question {
  padding: 20px 24px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s;
}

.faq-question:hover {
  background: rgba(255,255,255,0.03);
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease-out;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  padding: 0 24px 20px;
  max-height: 200px;
}

.faq-item.active .faq-question {
  color: var(--accent-cyan);
}

/* Hint & Micro-copy */
.hint-text {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 12px;
  display: block;
}

.slider-hint::before {
  content: '← 拖动探索 →';
  position: absolute;
  top: -30px;
  font-size: 0.7rem;
  color: var(--accent-cyan);
  letter-spacing: 0.2em;
  font-weight: 800;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-5px); }
}

@media (max-width: 1024px) {
  .gallery-grid {
    grid-template-columns: 1fr;
  }
}

.btn-primary {
  background: var(--text-primary);
  color: #000;
  padding: 16px 32px;
  border-radius: 12px;
  font-weight: 800;
  font-size: 1.1rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 20px rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 10px 30px rgba(255, 255, 255, 0.4);
}

/* Navigation */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 24px 0;
  z-index: 1000;
  background: rgba(5, 6, 8, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-glass);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: -0.05em;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-links {
  display: flex;
  gap: 40px;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--accent-cyan);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 150px;
  overflow: hidden;
}

.hero-content {
  max-width: 600px;
  z-index: 2;
}

.hero h1 {
  font-size: clamp(3rem, 8vw, 5rem);
  line-height: 0.95;
  margin-bottom: 24px;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 500px;
}

.hero-visual {
  position: absolute;
  right: -5%;
  top: 50%;
  transform: translateY(-50%);
  width: 55%;
  z-index: 1;
}

.hero-visual img {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 0 50px rgba(0, 242, 255, 0.2));
  animation: float 10s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-30px) rotate(2deg); }
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 60px;
}

.feature-card {
  padding: 40px;
  transition: all 0.3s;
}

.feature-card:hover {
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-10px);
}

.feature-card i {
  font-size: 2rem;
  color: var(--accent-cyan);
  margin-bottom: 24px;
  display: block;
}

.feature-card h3 {
  margin-bottom: 16px;
  font-size: 1.5rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Responsive */
@media (max-width: 1024px) {
  .hero-visual {
    position: relative;
    right: 0;
    top: 0;
    transform: none;
    width: 100%;
    margin-top: 60px;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
}

/* Learning Loop & Flow */
.loop-container {
  display: flex;
  justify-content: space-between;
  margin-top: 80px;
  position: relative;
  gap: 20px;
}

.loop-step {
  flex: 1;
  text-align: center;
  position: relative;
  z-index: 2;
  padding: 30px 20px;
  background: var(--glass-bg);
  border: 1px solid var(--border-glass);
  border-radius: 20px;
  transition: all 0.3s;
}

.loop-step:hover {
  border-color: var(--accent-cyan);
  background: rgba(0, 242, 255, 0.05);
}

.loop-step .step-number {
  font-family: var(--font-title);
  font-size: 3.5rem;
  font-weight: 950;
  color: transparent;
  position: absolute;
  top: -30px;
  left: 30px;
  z-index: -1;
  opacity: 0.1;
  -webkit-text-stroke: 2px var(--accent-cyan);
}

.loop-step .icon {
  font-size: 2rem;
  margin-bottom: 20px;
  display: block;
  color: var(--accent-cyan);
}

.loop-step h4 {
  margin-bottom: 12px;
  font-size: 1.15rem;
}

/* Interactive Demo Layout */
.demo-section {
  background: linear-gradient(to bottom, transparent, rgba(176, 38, 255, 0.05), transparent);
  border-top: 1px solid var(--border-glass);
  border-bottom: 1px solid var(--border-glass);
}

.demo-wrapper {
  display: flex;
  gap: 80px;
  align-items: center;
  padding: 80px 0;
}

.demo-content {
  flex: 1;
}

.demo-visual {
  flex: 1.2;
  position: relative;
}

.demo-visual img {
  width: 100%;
  border-radius: 16px;
  box-shadow: 0 40px 100px rgba(0,0,0,0.8);
  border: 1px solid var(--border-glass);
}

.demo-steps {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.demo-item {
  padding: 20px;
  border-radius: 12px;
  border: 1px solid transparent;
  transition: all 0.3s;
  cursor: pointer;
}

.demo-item.active {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-glass);
}

.demo-item h5 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--accent-cyan);
}

.demo-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding-left: 28px;
}

/* 🧱 Content Sovereignty Layer - Anti-Scraping */
.no-copy {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

#flow, .faq-container, .features-grid, .glass-pane p, .demo-content {
    -webkit-user-select: none;
    user-select: none;
}

.gallery-grid, .demo-visual {
    pointer-events: none; /* Prevents right-click 'save image as' easily */
}