/* ==========================================================================
   萤火虫 (Firefly) - 极速 VLESS + IPLC 专线网络
   Design System: Enchanted Bioluminescent Dark System
   ========================================================================== */

:root {
  --bg-main: #060d09;
  --bg-card: rgba(14, 28, 19, 0.75);
  --bg-card-hover: rgba(20, 42, 28, 0.9);
  --border-subtle: rgba(74, 222, 128, 0.15);
  --border-glow: rgba(74, 222, 128, 0.45);
  --primary: #22c55e;
  --primary-light: #4ade80;
  --primary-glow: rgba(34, 197, 94, 0.35);
  --accent-gold: #facc15;
  --accent-cyan: #38bdf8;
  --text-main: #f0fdf4;
  --text-muted: #86efac;
  --text-dim: #94a3b8;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --shadow-glow: 0 0 25px rgba(34, 197, 94, 0.25);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.6);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(34, 197, 94, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 85% 75%, rgba(74, 222, 128, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(14, 28, 19, 0.4) 0%, transparent 70%);
  background-attachment: fixed;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Typography Helpers */
h1, h2, h3, h4 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.25;
}

.text-gradient {
  background: linear-gradient(135deg, #ffffff 10%, #4ade80 60%, #22c55e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gold {
  color: var(--accent-gold);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #4ade80, #16a34a);
  color: #041208;
  box-shadow: 0 4px 20px rgba(34, 197, 94, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 26px rgba(34, 197, 94, 0.6);
  background: linear-gradient(135deg, #86efac, #22c55e);
}

.btn-secondary {
  background: rgba(14, 28, 19, 0.8);
  color: var(--text-main);
  border-color: var(--border-subtle);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(22, 45, 30, 0.9);
  border-color: var(--primary-light);
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-outline {
  background: transparent;
  color: var(--primary-light);
  border-color: rgba(74, 222, 128, 0.4);
}

.btn-outline:hover {
  background: rgba(34, 197, 94, 0.12);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 17px;
  border-radius: var(--radius-lg);
}

.btn-block {
  width: 100%;
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 13, 9, 0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 14px 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo-img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 0 12px rgba(34, 197, 94, 0.35);
}

.brand-name {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #ffffff;
}

.brand-badge {
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 6px;
  background: rgba(34, 197, 94, 0.15);
  color: var(--primary-light);
  border: 1px solid rgba(74, 222, 128, 0.3);
  font-weight: 600;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--primary-light);
}

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

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 24px;
  cursor: pointer;
}

/* Hero Section */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid var(--border-glow);
  border-radius: 50px;
  font-size: 13px;
  color: var(--primary-light);
  margin-bottom: 24px;
  animation: pulse-border 2.5s infinite;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary-light);
  box-shadow: 0 0 10px var(--primary-light);
}

@keyframes pulse-border {
  0%, 100% { border-color: rgba(74, 222, 128, 0.3); }
  50% { border-color: rgba(74, 222, 128, 0.8); box-shadow: 0 0 15px rgba(34, 197, 94, 0.2); }
}

.hero-title {
  font-size: clamp(34px, 5.5vw, 56px);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-dim);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-coupon-tip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(250, 204, 21, 0.08);
  border: 1px dashed rgba(250, 204, 21, 0.4);
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--accent-gold);
}

.coupon-code-tag {
  background: rgba(250, 204, 21, 0.2);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: monospace;
  font-weight: 700;
}

/* Metric Banner */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 48px;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: center;
  backdrop-filter: blur(8px);
  transition: transform 0.25s, border-color 0.25s;
}

.metric-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
}

.metric-val {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary-light);
  line-height: 1.2;
}

.metric-label {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 4px;
}

/* Section Common */
.section {
  padding: 70px 0;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 50px;
}

.section-tag {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--primary-light);
  font-weight: 700;
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-size: clamp(26px, 3.5vw, 36px);
  margin-bottom: 14px;
}

.section-desc {
  font-size: 15px;
  color: var(--text-dim);
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s;
}

.feature-box:hover {
  transform: translateY(-5px);
  border-color: var(--primary-light);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4), var(--shadow-glow);
}

.feature-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid rgba(74, 222, 128, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
}

.feature-box h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.feature-box p {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.6;
}

/* Node Ping Grid */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: all 0.25s;
}

.node-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-3px);
}

.node-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-flag-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
}

.node-flag {
  font-size: 20px;
}

.node-status-pill {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(34, 197, 94, 0.15);
  color: var(--primary-light);
}

.node-specs {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 8px;
}

.node-ping-val {
  color: var(--primary-light);
  font-weight: 700;
  font-family: monospace;
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px 22px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s;
}

.price-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}

.price-card.featured {
  border-color: var(--primary-light);
  background: linear-gradient(180deg, rgba(20, 48, 28, 0.85) 0%, rgba(10, 22, 14, 0.85) 100%);
  box-shadow: 0 0 30px rgba(34, 197, 94, 0.25);
}

.featured-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #22c55e, #10b981);
  color: #041208;
  font-size: 11px;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: 20px;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 10px rgba(34, 197, 94, 0.4);
}

.price-header {
  margin-bottom: 20px;
  text-align: center;
}

.plan-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 12px;
  color: var(--text-dim);
}

.price-value-wrap {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin: 18px 0;
}

.currency-sym {
  font-size: 20px;
  font-weight: 600;
  color: var(--primary-light);
}

.price-num {
  font-size: 38px;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
}

.price-period {
  font-size: 13px;
  color: var(--text-dim);
}

.price-coupon-pill {
  font-size: 11px;
  color: var(--accent-gold);
  background: rgba(250, 204, 21, 0.1);
  border: 1px solid rgba(250, 204, 21, 0.3);
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 16px;
}

.plan-features {
  list-style: none;
  margin: 0 0 24px 0;
  display: flex;
  flex-direction: column;
  gap: 11px;
  flex-grow: 1;
  font-size: 13px;
  color: #d1fae5;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 18px;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.check-icon {
  color: var(--primary-light);
  font-weight: bold;
}

/* Unlock Matrix */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.unlock-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: all 0.25s;
}

.unlock-item:hover {
  border-color: var(--primary-light);
  transform: translateY(-2px);
}

.unlock-icon {
  font-size: 24px;
}

.unlock-info h4 {
  font-size: 15px;
  margin-bottom: 2px;
}

.unlock-info span {
  font-size: 12px;
  color: var(--primary-light);
}

/* Tutorial Steps */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
}

.step-num {
  position: absolute;
  top: 18px;
  right: 20px;
  font-size: 32px;
  font-weight: 900;
  color: rgba(74, 222, 128, 0.15);
  font-family: monospace;
}

.step-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.step-card p {
  font-size: 14px;
  color: var(--text-dim);
}

/* FAQ Accordion */
.faq-grid {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.faq-question {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.faq-q-mark {
  color: var(--primary-light);
}

.faq-answer {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.6;
}

/* CTA Banner */
.cta-banner {
  margin: 60px 0;
  background: linear-gradient(135deg, rgba(20, 52, 30, 0.85) 0%, rgba(6, 15, 10, 0.95) 100%);
  border: 1px solid var(--primary-light);
  border-radius: var(--radius-lg);
  padding: 50px 30px;
  text-align: center;
  box-shadow: 0 0 40px rgba(34, 197, 94, 0.2);
}

.cta-banner h2 {
  font-size: clamp(26px, 3.5vw, 36px);
  margin-bottom: 14px;
}

.cta-banner p {
  color: var(--text-dim);
  max-width: 600px;
  margin: 0 auto 28px;
  font-size: 15px;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  background: #040906;
  padding: 50px 0 30px;
  font-size: 13px;
  color: var(--text-dim);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 30px;
  margin-bottom: 30px;
}

.footer-brand p {
  max-width: 320px;
  margin-top: 10px;
  line-height: 1.6;
}

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

.footer-col h5 {
  color: var(--text-main);
  font-size: 14px;
  margin-bottom: 12px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 12px;
}

/* Mobile Responsiveness */
@media (max-width: 992px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nodes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .unlock-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .nav-menu.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #060d09;
    border-bottom: 1px solid var(--border-subtle);
    padding: 20px;
    gap: 16px;
  }
  .menu-toggle {
    display: block;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    flex-direction: column;
  }
}