/* ===== CSS Variables ===== */
:root {
  --primary: #00F0FF;
  --primary-dim: rgba(0,240,255,0.12);
  --primary-glow: rgba(0,240,255,0.25);
  --accent: #FF006E;
  --accent-dim: rgba(255,0,110,0.12);
  --bg: #0A0A0F;
  --bg-alt: #0E0E18;
  --bg-card: #12121E;
  --text: #E0E0E0;
  --text-dim: #888899;
  --text-bright: #FFFFFF;
  --border: #1A1A2E;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 30px rgba(0,240,255,0.08);
  --transition: all 0.3s ease;
  --max-width: 1200px;
  --nav-height: 72px;
}

/* ===== Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: "PingFang SC","Microsoft YaHei","Inter",system-ui,sans-serif; color: var(--text); background: var(--bg); line-height: 1.7; overflow-x: hidden; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: #66f7ff; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
strong { color: #fff; }

/* ===== Sprite System ===== */
.sprite {
  background-image: url('../assets/images/anytd.png');
  background-repeat: no-repeat;
  display: block;
}

/* ===== Container ===== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ===== Section ===== */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }
.section-title { text-align: center; font-size: 2.2rem; font-weight: 700; margin-bottom: 12px; color: #fff; letter-spacing: -0.02em; }
.section-title span { color: var(--primary); }
.section-subtitle { text-align: center; font-size: 1.05rem; color: var(--text-dim); margin-bottom: 48px; max-width: 640px; margin-left: auto; margin-right: auto; }
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag { display: inline-block; padding: 4px 16px; border: 1px solid var(--primary-glow); border-radius: 20px; font-size: 0.75rem; color: var(--primary); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 16px; }
.section-desc { font-size: 1.05rem; color: var(--text-dim); max-width: 600px; margin: 0 auto; }
.text-gradient { background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

/* ===== Grid ===== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ===== Card ===== */
.card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; transition: var(--transition); position: relative; overflow: hidden; }
.card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, transparent, var(--primary), transparent); opacity: 0; transition: var(--transition); }
.card:hover { transform: translateY(-4px); border-color: var(--primary-glow); box-shadow: var(--shadow-glow); }
.card:hover::before { opacity: 1; }
.card-icon { width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center; margin-bottom: 20px; font-size: 1.3rem; }
.card-icon.cyan { background: var(--primary-dim); }
.card-icon.pink { background: var(--accent-dim); }
.card h3 { font-size: 1.2rem; margin-bottom: 10px; color: #fff; }
.card h4 { font-size: 1rem; margin-bottom: 8px; color: #fff; }
.card p { color: var(--text-dim); font-size: 0.92rem; line-height: 1.7; }
.card.compact { padding: 24px; }
.card-highlight { border-color: var(--primary); box-shadow: var(--shadow-glow); }
.card-highlight::before { opacity: 1; }

/* ===== Button ===== */
.btn { display: inline-block; padding: 12px 32px; border-radius: 8px; font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: var(--transition); border: none; text-align: center; font-family: inherit; }
.btn-primary { background: var(--primary); color: #0A0A0F; }
.btn-primary:hover { background: #33f3ff; color: #0A0A0F; transform: translateY(-2px); box-shadow: 0 4px 20px rgba(0,240,255,0.35); }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #0A0A0F; }

/* ===== Navbar ===== */
.navbar { position: fixed; top: 0; left: 0; right: 0; height: var(--nav-height); background: rgba(10,10,15,0.9); backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); z-index: 1000; transition: var(--transition); }
.navbar .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.nav-logo { display: flex; align-items: center; }
.nav-links { display: flex; gap: 28px; }
.nav-links a { color: var(--text-dim); font-size: 0.92rem; font-weight: 500; position: relative; }
.nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--primary); transition: var(--transition); }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--text); transition: var(--transition); border-radius: 2px; }
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== Hero ===== */
.hero { padding-top: calc(var(--nav-height) + 60px); padding-bottom: 80px; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -200px; left: 50%; transform: translateX(-50%); width: 900px; height: 900px; background: radial-gradient(circle, rgba(0,240,255,0.06) 0%, transparent 65%); pointer-events: none; }
.hero .container { display: flex; align-items: center; gap: 60px; position: relative; z-index: 1; }
.hero-content { flex: 1; }
.hero-badge { display: inline-block; padding: 6px 16px; border: 1px solid var(--primary-glow); border-radius: 20px; font-size: 0.8rem; color: var(--primary); margin-bottom: 24px; letter-spacing: 0.05em; }
.hero-content h1 { font-size: 3rem; font-weight: 800; line-height: 1.2; margin-bottom: 20px; color: #fff; }
.hero-content h1 span { color: var(--primary); }
.hero-content h1 span.alt { color: var(--accent); }
.hero-desc { font-size: 1.05rem; color: var(--text-dim); margin-bottom: 32px; max-width: 480px; }
.hero-buttons { display: flex; gap: 16px; }
.hero-sprite { flex-shrink: 0; }

/* ===== Sprite Showcase ===== */
.sprite-showcase { text-align: center; margin: 40px 0; }
.sprite-showcase .sprite { margin: 0 auto; border-radius: var(--radius); }

/* ===== Comparison ===== */
.comparison-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; max-width: 800px; margin: 0 auto; }

/* ===== Step Grid ===== */
.step-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 48px; }
.step-card { text-align: center; padding: 28px 20px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); transition: var(--transition); }
.step-card:hover { border-color: var(--primary-glow); transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.step-num { font-size: 2rem; font-weight: 800; color: var(--primary); opacity: 0.3; margin-bottom: 8px; }
.step-card h3 { font-size: 1.15rem; color: #fff; margin-bottom: 8px; }
.step-card p { color: var(--text-dim); font-size: 0.88rem; }

/* ===== Matrix ===== */
.matrix-layout { display: flex; align-items: center; gap: 48px; }
.matrix-sprite { flex-shrink: 0; }
.matrix-cards { flex: 1; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

/* ===== Demo ===== */
.demo-tabs { display: flex; justify-content: center; gap: 8px; margin-bottom: 32px; flex-wrap: wrap; max-width: 900px; margin-left: auto; margin-right: auto; }
.demo-tab { padding: 6px 14px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 20px; color: var(--text-dim); font-size: 0.78rem; font-weight: 500; cursor: pointer; transition: var(--transition); font-family: inherit; white-space: nowrap; }
.demo-tab:hover { border-color: var(--primary-glow); color: var(--primary); }
.demo-tab.active { background: var(--primary-dim); border-color: var(--primary); color: var(--primary); font-weight: 600; }
.demo-layout { display: flex; align-items: center; gap: 48px; }
.demo-terminal { flex: 1; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.terminal-header { display: flex; align-items: center; gap: 8px; padding: 12px 16px; background: rgba(0,0,0,0.3); border-bottom: 1px solid var(--border); }
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }
.terminal-title { color: var(--text-dim); font-size: 0.78rem; margin-left: 12px; }
.terminal-body { padding: 20px; min-height: 260px; font-family: "JetBrains Mono","Fira Code","Courier New",monospace; font-size: 0.85rem; line-height: 1.8; }
.terminal-line { display: flex; align-items: center; gap: 8px; }
.prompt { color: var(--primary); }
.typed { color: #fff; }
.cursor { color: var(--primary); animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }
.terminal-output { color: var(--text-dim); padding-left: 20px; }
.terminal-output.success { color: #28c840; }
.terminal-output.info { color: var(--primary); }
.demo-btn { display: block; width: 100%; padding: 12px; background: rgba(0,0,0,0.3); border: none; border-top: 1px solid var(--border); color: var(--primary); font-size: 0.9rem; font-weight: 600; cursor: pointer; transition: var(--transition); font-family: inherit; }
.demo-btn:hover { background: var(--primary-dim); }
.demo-sprite { flex-shrink: 0; }

/* ===== Roadmap ===== */
.roadmap { max-width: 860px; margin: 0 auto; }
.roadmap-phase { margin-bottom: 48px; }
.phase-header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.phase-header h3 { font-size: 1.15rem; color: #fff; }
.phase-tag { padding: 4px 14px; border-radius: 20px; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.05em; }
.phase-tag.now { background: var(--primary-dim); color: var(--primary); border: 1px solid var(--primary); }
.phase-tag.mid { background: var(--accent-dim); color: var(--accent); border: 1px solid var(--accent); }
.phase-tag.future { background: rgba(168,85,247,0.12); color: #a855f7; border: 1px solid #a855f7; }
.phase-items { display: grid; gap: 14px; }
.phase-item { display: flex; gap: 16px; padding: 20px 24px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); transition: var(--transition); }
.phase-item:hover { border-color: var(--primary-glow); }
.phase-icon { font-size: 1.4rem; flex-shrink: 0; width: 36px; text-align: center; }
.phase-item h4 { font-size: 0.98rem; color: #fff; margin-bottom: 4px; }
.phase-item p { color: var(--text-dim); font-size: 0.86rem; }
.evolution-chain { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 8px; margin-top: 48px; padding: 24px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); }
.chain-item { padding: 6px 16px; border: 1px solid var(--border); border-radius: 20px; font-size: 0.82rem; color: var(--text-dim); }
.chain-item.active { color: var(--primary); border-color: var(--primary); background: var(--primary-dim); font-weight: 600; }
.chain-arrow { color: var(--text-dim); font-size: 0.85rem; opacity: 0.4; }

/* ===== About ===== */
.about-layout { display: flex; align-items: center; gap: 48px; }
.about-sprite { flex-shrink: 0; }
.about-text { flex: 1; }
.about-text h3 { font-size: 1.4rem; color: #fff; margin-bottom: 16px; }
.vision-quote { font-size: 1.1rem; color: var(--primary); font-style: italic; margin-bottom: 16px; padding-left: 16px; border-left: 3px solid var(--primary); }
.about-text > p { color: var(--text-dim); margin-bottom: 24px; }
.about-values { display: flex; flex-wrap: wrap; gap: 10px; }
.value-tag { padding: 6px 16px; border: 1px solid var(--border); border-radius: 20px; font-size: 0.82rem; color: var(--primary); transition: var(--transition); }
.value-tag:hover { border-color: var(--primary); background: var(--primary-dim); }

/* ===== CTA / Waitlist ===== */
.cta-section { background: var(--bg-alt); }
.cta-box { display: flex; align-items: center; gap: 48px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 48px; position: relative; overflow: hidden; }
.cta-box::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, var(--primary), var(--accent)); }
.cta-sprite { flex-shrink: 0; }
.cta-content { flex: 1; }
.cta-content h2 { font-size: 1.8rem; color: #fff; margin-bottom: 12px; }
.cta-content h2 span { color: var(--primary); }
.cta-content > p { color: var(--text-dim); margin-bottom: 24px; }
.waitlist-form { display: flex; gap: 12px; margin-bottom: 12px; }
.waitlist-form input { flex: 1; padding: 12px 20px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; color: #fff; font-size: 0.95rem; font-family: inherit; transition: var(--transition); }
.waitlist-form input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-dim); }
.waitlist-form input::placeholder { color: var(--text-dim); }
.form-note { color: var(--text-dim); font-size: 0.8rem; }

/* ===== Footer ===== */
.footer { background: #06060A; color: var(--text-dim); padding: 64px 0 0; border-top: 1px solid var(--border); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid var(--border); }
.footer h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
.footer-brand p { font-size: 0.88rem; line-height: 1.7; margin-bottom: 12px; }
.footer-links a { display: block; color: var(--text-dim); font-size: 0.88rem; margin-bottom: 10px; }
.footer-links a:hover { color: var(--primary); }
.footer-bottom { padding: 20px 0; display: flex; justify-content: space-between; align-items: center; font-size: 0.82rem; }

/* ===== Fade-in ===== */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== Back to Top ===== */
.back-top { position: fixed; bottom: 32px; right: 32px; width: 44px; height: 44px; border-radius: 50%; background: var(--bg-card); color: var(--primary); border: 1px solid var(--border); cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; opacity: 0; pointer-events: none; transition: var(--transition); z-index: 900; }
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { border-color: var(--primary); background: var(--primary-dim); }

/* ===== Responsive ===== */
@media (max-width: 1023px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .step-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .hero .container { flex-direction: column; text-align: center; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-buttons { justify-content: center; }
  .matrix-layout, .about-layout, .demo-layout { flex-direction: column; }
  .cta-box { flex-direction: column; text-align: center; }
  .comparison-cards { grid-template-columns: 1fr; }
}

@media (max-width: 767px) {
  .nav-links { display: none; position: fixed; top: var(--nav-height); left: 0; right: 0; background: rgba(10,10,15,0.98); flex-direction: column; padding: 24px; gap: 16px; border-bottom: 1px solid var(--border); }
  .nav-links.open { display: flex; }
  .hamburger { display: flex; }
  .hero-content h1 { font-size: 2rem; }
  .section { padding: 64px 0; }
  .section-title { font-size: 1.6rem; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .step-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .hero-sprite .sprite, .sprite-showcase .sprite { width: 100% !important; height: auto !important; }
  .matrix-cards { grid-template-columns: 1fr; }
  .waitlist-form { flex-direction: column; }
  .evolution-chain { gap: 4px; }
  .chain-item { font-size: 0.72rem; padding: 4px 10px; }
}