/* ============================================
   Kurenai Network - Main Stylesheet
   Kurenai.io | Kurenai Network
   Design: Dark theme, Crimson Red accent
   ============================================ */

/* === CSS Variables / Design System === */
:root {
  --color-primary: #e63946;
  --color-primary-dark: #c1121f;
  --color-primary-light: #ff6b6b;
  --color-bg-dark: #0a0a1a;
  --color-bg-darker: #060612;
  --color-bg-card: #12122a;
  --color-bg-card-hover: #1a1a3e;
  --color-text-primary: #f0f0f0;
  --color-text-secondary: #a0a0b8;
  --color-text-muted: #6a6a8a;
  --color-border: rgba(230, 57, 70, 0.15);
  --color-glass: rgba(18, 18, 42, 0.6);
  --color-glass-border: rgba(230, 57, 70, 0.2);
  --color-success: #2ecc71;
  --color-warning: #f39c12;
  --gradient-primary: linear-gradient(135deg, #e63946 0%, #c1121f 100%);
  --gradient-hero: linear-gradient(135deg, #0a0a1a 0%, #16213e 50%, #0a0a1a 100%);
  --gradient-card: linear-gradient(145deg, rgba(230, 57, 70, 0.05) 0%, rgba(15, 52, 96, 0.1) 100%);
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1200px;
  --nav-height: 70px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(230, 57, 70, 0.3);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

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

body {
  font-family: var(--font-main);
  background: var(--color-bg-dark);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-light);
}

img {
  max-width: 100%;
  height: auto;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.5em;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 48px;
  text-align: center;
}

.text-center {
  text-align: center;
}

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

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  outline: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 15px rgba(230, 57, 70, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(230, 57, 70, 0.4);
  color: #fff;
}

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

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

.btn-sm {
  padding: 8px 20px;
  font-size: 0.85rem;
}

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: all var(--transition-normal);
  background: transparent;
}

.nav.scrolled {
  background: rgba(10, 10, 26, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav-logo:hover {
  color: var(--color-text-primary);
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-normal);
}

.nav-links a:hover {
  color: var(--color-text-primary);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-links .btn {
  margin-left: 8px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: all var(--transition-normal);
  border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* === Hero Section === */
.hero {
  min-height: 100vh;
  background: var(--gradient-hero);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero-particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--color-primary);
  border-radius: 50%;
  opacity: 0.3;
  animation: float-particle linear infinite;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at center, transparent 0%, var(--color-bg-dark) 70%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 2;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(230, 57, 70, 0.1);
  border: 1px solid rgba(230, 57, 70, 0.2);
  border-radius: 50px;
  font-size: 0.8rem;
  color: var(--color-primary);
  margin-bottom: 24px;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.1;
}

.hero-title-jp {
  display: block;
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-top: 8px;
  letter-spacing: 2px;
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto 36px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 60px;
  flex-wrap: wrap;
}

.hero-stat {
  text-align: center;
}

.hero-stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.hero-stat-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* === Services Section === */
.services {
  padding: 100px 0;
  background: var(--color-bg-darker);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 36px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.service-card:hover {
  transform: translateY(-8px);
  border-color: rgba(230, 57, 70, 0.3);
  box-shadow: var(--shadow-lg);
  background: var(--color-bg-card-hover);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-icon {
  width: 56px;
  height: 56px;
  background: rgba(230, 57, 70, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.service-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.service-card p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: 16px;
  line-height: 1.7;
}

.service-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(230, 57, 70, 0.1);
  border: 1px solid rgba(230, 57, 70, 0.15);
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* === Features Section === */
.features {
  padding: 100px 0;
  background: var(--color-bg-dark);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  text-align: center;
  padding: 32px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  border-color: rgba(230, 57, 70, 0.3);
  transform: translateY(-4px);
  background: var(--color-bg-card);
}

.feature-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  background: rgba(230, 57, 70, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.feature-card h4 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* === Protocol Section (V2Ray / VLESS) === */
.protocol {
  padding: 100px 0;
  background: var(--color-bg-darker);
}

.protocol-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.protocol-visual {
  position: relative;
}

.protocol-shape {
  width: 100%;
  aspect-ratio: 1;
  max-width: 400px;
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  position: relative;
}

.protocol-shape-inner {
  width: 80%;
  height: 80%;
  border: 2px dashed rgba(230, 57, 70, 0.3);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  position: relative;
}

.protocol-node {
  width: 12px;
  height: 12px;
  background: var(--color-primary);
  border-radius: 50%;
  position: absolute;
  box-shadow: 0 0 12px rgba(230, 57, 70, 0.5);
}

.protocol-node:nth-child(1) { top: 15%; left: 20%; }
.protocol-node:nth-child(2) { top: 30%; right: 15%; }
.protocol-node:nth-child(3) { bottom: 25%; left: 25%; }
.protocol-node:nth-child(4) { bottom: 15%; right: 20%; }
.protocol-node:nth-child(5) { top: 50%; left: 50%; transform: translate(-50%, -50%); width: 20px; height: 20px; background: var(--color-primary); }

.protocol-connector {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.protocol-connector svg {
  width: 100%;
  height: 100%;
}

.protocol-info h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-bottom: 16px;
}

.protocol-info p {
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  line-height: 1.7;
}

.protocol-info ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.protocol-info ul li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.protocol-info ul li::before {
  content: '✓';
  color: var(--color-primary);
  font-weight: 700;
}

/* === Pricing Section === */
.pricing {
  padding: 100px 0;
  background: var(--color-bg-dark);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.pricing-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  transition: all var(--transition-normal);
  position: relative;
}

.pricing-card.featured {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
  transform: scale(1.03);
}

.pricing-card.featured .pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-primary);
  color: #fff;
  padding: 4px 20px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: rgba(230, 57, 70, 0.3);
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-8px);
}

.pricing-name {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.pricing-currency {
  font-size: 1.2rem;
  font-weight: 600;
}

.pricing-period {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.pricing-features {
  margin-bottom: 20px;
}

.pricing-features li {
  padding: 6px 0;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li::before {
  content: '✓';
  color: var(--color-success);
  font-weight: 700;
}

.pricing-features li.disabled {
  color: var(--color-text-muted);
  text-decoration: line-through;
}

.pricing-features li.disabled::before {
  content: '✗';
  color: var(--color-text-muted);
}

/* === CTA Section === */
.cta-banner {
  padding: 80px 0;
  background: var(--color-bg-darker);
  text-align: center;
}

.cta-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  max-width: 800px;
  margin: 0 auto;
}

.cta-card h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-bottom: 12px;
}

.cta-card p {
  color: var(--color-text-secondary);
  margin-bottom: 28px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* === Footer === */
.footer {
  background: var(--color-bg-darker);
  border-top: 1px solid var(--color-border);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-top: 12px;
  line-height: 1.7;
  max-width: 300px;
}

.footer h4 {
  font-size: 0.9rem;
  margin-bottom: 20px;
  color: var(--color-text-primary);
}

.footer ul li {
  margin-bottom: 10px;
}

.footer ul li a {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

.footer ul li a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(230, 57, 70, 0.1);
}

/* === Section Transitions === */
.section-hidden {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

.section-visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Animations === */
@keyframes float-particle {
  0% {
    transform: translateY(100vh) rotate(0deg);
    opacity: 0;
  }
  10% {
    opacity: 0.3;
  }
  90% {
    opacity: 0.3;
  }
  100% {
    transform: translateY(-10vh) rotate(720deg);
    opacity: 0;
  }
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* === Responsive === */
@media (max-width: 992px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .protocol-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .protocol-visual {
    display: flex;
    justify-content: center;
    order: -1;
  }

  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    max-width: 600px;
    margin: 0 auto;
  }

  .pricing-card.featured {
    transform: none;
    box-shadow: var(--shadow-glow);
  }

  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 10, 26, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-stats {
    gap: 24px;
  }

  .hero-stat-number {
    font-size: 1.5rem;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 380px;
    margin: 0 auto;
  }

  .pricing-card.featured {
    transform: none;
  }

  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .pricing-card {
    padding: 28px 20px;
  }

  .service-card {
    padding: 24px;
  }
}