/* ========================================
   Master D — Command Guide Site
   Web3 Deep Space Aesthetic
   ======================================== */

/* --- CSS Variables --- */
:root {
  --bg-primary: #050510;
  --bg-secondary: #0a0a1f;
  --bg-card: rgba(15, 15, 40, 0.6);
  --bg-glass: rgba(20, 20, 50, 0.4);

  --text-primary: #e8e8f0;
  --text-secondary: #8888aa;
  --text-muted: #555570;

  --accent-cyan: #00e5ff;
  --accent-purple: #a855f7;
  --accent-blue: #3b82f6;
  --accent-pink: #ec4899;
  --accent-green: #10b981;

  --gradient-main: linear-gradient(135deg, #00e5ff 0%, #a855f7 50%, #ec4899 100%);
  --gradient-card: linear-gradient(135deg, rgba(0,229,255,0.1) 0%, rgba(168,85,247,0.1) 100%);
  --gradient-glow: radial-gradient(circle, rgba(0,229,255,0.15) 0%, transparent 70%);

  --border-glass: rgba(255,255,255,0.06);
  --border-accent: rgba(0,229,255,0.2);

  --font-display: 'Orbitron', sans-serif;
  --font-body: 'Noto Sans TC', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-glow: 0 0 40px rgba(0,229,255,0.1);
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
}

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0; padding: 0; box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: rgba(0,229,255,0.3); border-radius: 3px; }

/* --- Particle Canvas --- */
#particles {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ============================
   NAVIGATION
   ============================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0 2rem;
  background: rgba(5,5,16,0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-img {
  width: 40px;
  height: 40px;
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 2px;
}

.logo-text .accent {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-secondary);
  transition: all 0.3s ease;
  position: relative;
  padding: 4px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--gradient-main);
  transition: width 0.3s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Language Toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  background: rgba(0,229,255,0.05);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.lang-toggle:hover {
  background: rgba(0,229,255,0.1);
  box-shadow: 0 0 16px rgba(0,229,255,0.15);
}

/* Mobile Menu Button */
.menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all 0.3s ease;
  border-radius: 2px;
}

.menu-btn.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-btn.active span:nth-child(2) { opacity: 0; }
.menu-btn.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile Menu */
.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 1rem 0 1.5rem;
  gap: 0.5rem;
}

.mobile-menu.open { display: flex; }

.mobile-link {
  padding: 10px 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-glass);
  transition: color 0.3s;
}

.mobile-link:hover, .mobile-link.active { color: var(--accent-cyan); }

/* ============================
   HERO
   ============================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 2rem 80px;
  z-index: 1;
}

.hero-glow {
  position: absolute;
  top: -20%; left: 50%;
  transform: translateX(-50%);
  width: 800px; height: 800px;
  background: radial-gradient(circle, rgba(0,229,255,0.08) 0%, rgba(168,85,247,0.05) 40%, transparent 70%);
  pointer-events: none;
  animation: pulse-glow 6s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.6; transform: translateX(-50%) scale(1); }
  50% { opacity: 1; transform: translateX(-50%) scale(1.1); }
}

.hero-content {
  max-width: 800px;
  text-align: center;
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border: 1px solid var(--border-accent);
  border-radius: 100px;
  background: rgba(0,229,255,0.05);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  font-weight: 500;
  margin-bottom: 2rem;
  animation: fadeInUp 0.8s ease;
}

.badge-dot {
  width: 8px; height: 8px;
  background: var(--accent-cyan);
  border-radius: 50%;
  animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 2px;
  margin-bottom: 1.5rem;
}

.title-line {
  display: block;
  animation: fadeInUp 0.8s ease backwards;
}

.title-line:nth-child(1) { animation-delay: 0.2s; }
.title-line:nth-child(2) { animation-delay: 0.4s; }

.gradient-text {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
  animation: fadeInUp 0.8s ease 0.6s backwards;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Formula Card --- */
.formula-card {
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  padding: 0;
  margin-bottom: 2.5rem;
  overflow: hidden;
  backdrop-filter: blur(12px);
  animation: fadeInUp 0.8s ease 0.8s backwards;
  box-shadow: var(--shadow-glow);
}

.formula-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 24px;
  background: rgba(0,229,255,0.05);
  border-bottom: 1px solid var(--border-glass);
}

.formula-icon { font-size: 1.2rem; }

.formula-title {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent-cyan);
  text-transform: uppercase;
}

.formula-body { padding: 24px; }

.formula-parts {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.formula-part {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
}

.formula-part:nth-child(1) { background: rgba(0,229,255,0.15); color: var(--accent-cyan); }
.formula-part:nth-child(3) { background: rgba(168,85,247,0.15); color: var(--accent-purple); }
.formula-part:nth-child(5) { background: rgba(59,130,246,0.15); color: var(--accent-blue); }
.formula-part:nth-child(7) { background: rgba(236,72,153,0.15); color: var(--accent-pink); }
.formula-part:nth-child(9) { background: rgba(16,185,129,0.15); color: var(--accent-green); }

.formula-plus {
  color: var(--text-muted);
  font-size: 1.2rem;
  font-weight: 300;
}

.formula-example {
  background: rgba(0,0,0,0.3);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  text-align: left;
}

.formula-label {
  font-size: 0.8rem;
  color: var(--accent-cyan);
  margin-bottom: 8px;
  font-weight: 500;
}

.formula-code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.8;
  display: block;
}

/* --- Hero Buttons --- */
.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 1s backwards;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
}

.btn-primary {
  background: var(--gradient-main);
  color: #000;
  box-shadow: 0 4px 20px rgba(0,229,255,0.3);
}

.btn-primary:hover {
  box-shadow: 0 4px 30px rgba(0,229,255,0.5);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
}

.btn-ghost:hover {
  border-color: var(--accent-cyan);
  background: rgba(0,229,255,0.05);
}

.btn-lg {
  padding: 18px 36px;
  font-size: 1.05rem;
}

/* ============================
   CAPABILITIES
   ============================ */
.capabilities {
  position: relative;
  z-index: 1;
  padding: 100px 2rem;
  max-width: 1280px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 0.8rem;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
}

.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.capability-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2rem;
  overflow: hidden;
  transition: all 0.4s ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.capability-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
}

.card-glow {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

.capability-card:hover .card-glow { opacity: 1; }

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 0.5rem;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  flex: 1;
}

.card-arrow {
  margin-top: 1.2rem;
  font-size: 1.3rem;
  color: var(--accent-cyan);
  opacity: 0;
  transform: translateX(-10px);
  transition: all 0.3s ease;
}

.capability-card:hover .card-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ============================
   TIPS
   ============================ */
.tips-section {
  position: relative;
  z-index: 1;
  padding: 80px 2rem 100px;
  max-width: 1280px;
  margin: 0 auto;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.tip-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.3s ease;
}

.tip-card:hover {
  border-color: var(--border-accent);
}

.tip-number {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
  line-height: 1;
}

.tip-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
}

.tip-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ============================
   CTA
   ============================ */
.cta-section {
  position: relative;
  z-index: 1;
  padding: 60px 2rem 100px;
  max-width: 800px;
  margin: 0 auto;
}

.cta-card {
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-xl);
  padding: 3.5rem 2.5rem;
  box-shadow: var(--shadow-glow);
}

.cta-card h2 {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 1rem;
}

.cta-card p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-size: 1rem;
}

/* ============================
   FOOTER
   ============================ */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border-glass);
  padding: 2.5rem 2rem;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.footer-logo {
  width: 48px;
  height: 48px;
  opacity: 0.7;
}

.footer-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ============================
   RESPONSIVE
   ============================ */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .menu-btn { display: flex; }
  
  .hero { padding: 100px 1.5rem 60px; }
  .hero-title { font-size: 1.8rem; }
  
  .formula-parts { gap: 6px; }
  .formula-part { padding: 6px 12px; font-size: 0.8rem; }
  
  .capabilities { padding: 60px 1.5rem; }
  .capabilities-grid { grid-template-columns: 1fr; }
  
  .tips-grid { grid-template-columns: 1fr; }
  
  .cta-card { padding: 2.5rem 1.5rem; }
}

@media (max-width: 480px) {
  .navbar { padding: 0 1rem; }
  .hero-badge { font-size: 0.75rem; padding: 6px 14px; }
  .hero-desc { font-size: 0.95rem; }
  .btn { padding: 12px 20px; font-size: 0.9rem; }
}