/* ═══════════════════════════════════════════════════════════════
   飞鸟 Flybird - 风格1:「御风极翼」流线空力风 (Aero-Stream Kinetic)
   ═══════════════════════════════════════════════════════════════ */

:root {
  --bs-font-sans-serif: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --aero-bg: #070b14;
  --aero-bg-card: rgba(13, 20, 36, 0.75);
  --aero-bg-card-hover: rgba(18, 28, 51, 0.9);
  --aero-blue: #38bdf8;
  --aero-cyan: #00f2fe;
  --aero-indigo: #4f46e5;
  --aero-text: #f1f5f9;
  --aero-text-muted: #94a3b8;
  --aero-text-dim: #64748b;
  --aero-border: rgba(56, 189, 248, 0.16);
  --aero-border-glow: rgba(0, 242, 254, 0.45);
  --aero-glow: rgba(0, 242, 254, 0.22);
}

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

body {
  font-family: var(--bs-font-sans-serif);
  background-color: var(--aero-bg);
  color: var(--aero-text);
  overflow-x: hidden;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
}

/* ── Wind Tunnel Grid & Streamline Background ── */
.aero-bg-blobs {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.aero-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-size: 60px 60px;
  background-image: 
    linear-gradient(to right, rgba(56, 189, 248, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(56, 189, 248, 0.02) 1px, transparent 1px);
}

.aero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.35;
  animation: aero-float 16s ease-in-out infinite alternate;
}
.aero-orb-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.25), transparent 70%);
  top: -150px;
  right: -100px;
}
.aero-orb-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.3), transparent 70%);
  bottom: 10%;
  left: -120px;
  animation-delay: -6s;
}
.aero-orb-3 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.2), transparent 70%);
  top: 45%;
  right: 15%;
  animation-delay: -10s;
}

@keyframes aero-float {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.12); }
  100% { transform: translate(-30px, 25px) scale(0.95); }
}

/* ── Streamline Wind Lines ── */
.wind-streak {
  position: absolute;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(56, 189, 248, 0.8), transparent);
  animation: streak 4s linear infinite;
  opacity: 0.6;
}
@keyframes streak {
  0% { transform: translateX(-100vw); opacity: 0; }
  30% { opacity: 0.8; }
  70% { opacity: 0.8; }
  100% { transform: translateX(100vw); opacity: 0; }
}

.page-wrap {
  position: relative;
  z-index: 1;
}

/* ── Navbar ── */
.navbar-wrap {
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}
.site-navbar {
  background: rgba(10, 15, 29, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--aero-border);
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transition: all 0.3s ease;
}
.site-navbar:hover {
  border-color: rgba(56, 189, 248, 0.3);
}
.navbar-logo {
  height: 38px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 0 12px rgba(0, 242, 254, 0.4));
}
.navbar-brand-text {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #fff;
}
.site-navbar .nav-link {
  color: var(--aero-text-muted);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 10px;
  transition: all 0.25s ease;
}
.site-navbar .nav-link:hover {
  color: var(--aero-cyan);
  background: rgba(56, 189, 248, 0.08);
}
.site-navbar .nav-link.active {
  color: #fff;
  background: rgba(56, 189, 248, 0.12);
}

/* ── Buttons ── */
.btn-primary-custom {
  background: linear-gradient(135deg, #00f2fe 0%, #0284c7 60%, #4338ca 100%);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(0, 242, 254, 0.35);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.btn-primary-custom:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0, 242, 254, 0.55);
}

.btn-outline-custom {
  background: rgba(255, 255, 255, 0.04);
  color: #e2e8f0;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 10px;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.btn-outline-custom:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--aero-cyan);
  border-color: var(--aero-cyan);
  transform: translateY(-2px);
}

.btn-ghost-custom {
  color: var(--aero-text-muted);
  border-radius: 10px;
  font-weight: 600;
  transition: all 0.2s;
}
.btn-ghost-custom:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.btn-white-custom {
  background: #ffffff;
  color: #070b14;
  font-weight: 800;
  border-radius: 12px;
  border: none;
  box-shadow: 0 6px 24px rgba(255, 255, 255, 0.3);
  transition: all 0.3s ease;
}
.btn-white-custom:hover {
  background: #e2e8f0;
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(0, 242, 254, 0.4);
}

/* ── Aero Card (Glass + Streamline Border) ── */
.aero-card {
  background: var(--aero-bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--aero-border);
  border-radius: 18px;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.45);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.aero-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--aero-cyan), transparent);
  transition: 0.5s;
}
.aero-card:hover {
  background: var(--aero-bg-card-hover);
  border-color: var(--aero-border-glow);
  transform: translateY(-4px);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.6), 0 0 24px rgba(0, 242, 254, 0.15);
}
.aero-card:hover::before {
  left: 100%;
}

/* ── Hero Section ── */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 100px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--aero-cyan);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--aero-cyan);
  box-shadow: 0 0 10px var(--aero-cyan);
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-title {
  font-size: clamp(34px, 5.2vw, 58px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1px;
  color: #ffffff;
}
.text-gradient-aero {
  background: linear-gradient(135deg, #ffffff 10%, #38bdf8 55%, #00f2fe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: 22px;
  font-weight: 700;
  color: #38bdf8;
  letter-spacing: 0.5px;
}
.hero-desc {
  font-size: 16px;
  color: var(--aero-text-muted);
  line-height: 1.7;
}

.trust-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 13px;
  font-weight: 600;
  color: #cbd5e1;
}

/* ── Speed Cockpit Card (Right Hero) ── */
.cockpit-box {
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.9) 0%, rgba(7, 11, 20, 0.95) 100%);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 24px;
  padding: 28px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6), 0 0 30px rgba(56, 189, 248, 0.15);
  position: relative;
  overflow: hidden;
}
.cockpit-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.cockpit-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  color: #34d399;
}
.cockpit-ping {
  font-size: 38px;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
}
.cockpit-ping small {
  font-size: 14px;
  color: var(--aero-cyan);
  font-weight: 600;
}
.cockpit-metric-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 20px;
}
.cockpit-metric-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 12px;
  text-align: center;
}
.cockpit-metric-label {
  font-size: 11px;
  color: var(--aero-text-dim);
  font-weight: 600;
}
.cockpit-metric-val {
  font-size: 16px;
  color: #fff;
  font-weight: 800;
  margin-top: 4px;
}

/* ── Section Titles ── */
.sec-tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 100px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: var(--aero-cyan);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.sec-title {
  font-size: clamp(26px, 3.5vw, 42px);
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.5px;
}
.sec-desc {
  font-size: 15px;
  color: var(--aero-text-muted);
  line-height: 1.6;
}

/* ── Stats ── */
.stat-card {
  padding: 24px 20px;
  text-align: center;
  border-radius: 16px;
  background: var(--aero-bg-card);
  border: 1px solid var(--aero-border);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  transition: all 0.3s ease;
}
.stat-card:hover {
  border-color: var(--aero-border-glow);
  transform: translateY(-3px);
}
.stat-icon {
  font-size: 28px;
}
.stat-num {
  font-size: 36px;
  font-weight: 900;
  color: #fff;
  letter-spacing: -1px;
}
.stat-lbl {
  font-size: 13px;
  color: var(--aero-text-muted);
  font-weight: 600;
}

/* ── Feature Cards ── */
.feat-card {
  padding: 32px 28px;
  border-radius: 20px;
  background: var(--aero-bg-card);
  border: 1px solid var(--aero-border);
  transition: all 0.35s ease;
  height: 100%;
}
.feat-card:hover {
  background: var(--aero-bg-card-hover);
  border-color: var(--aero-border-glow);
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5), 0 0 20px rgba(56, 189, 248, 0.12);
}
.feat-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.15), rgba(79, 70, 229, 0.15));
  border: 1px solid rgba(0, 242, 254, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}
.feat-title {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
}
.feat-desc {
  font-size: 14px;
  color: var(--aero-text-muted);
  line-height: 1.65;
}

/* ── Pricing Cards ── */
.pricing-card {
  padding: 36px 30px;
  border-radius: 24px;
  background: var(--aero-bg-card);
  border: 1px solid var(--aero-border);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
  transition: all 0.35s ease;
  height: 100%;
  display: flex;
  flex-direction: column;
  position: relative;
}
.pricing-card:hover {
  border-color: var(--aero-border-glow);
  transform: translateY(-5px);
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.6), 0 0 24px rgba(0, 242, 254, 0.18);
}
.pricing-card.hot {
  background: linear-gradient(155deg, rgba(16, 26, 49, 0.95) 0%, rgba(9, 14, 26, 0.95) 100%);
  border: 1.5px solid #00f2fe;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), 0 0 35px rgba(0, 242, 254, 0.25);
}
.price-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  padding: 5px 16px;
  border-radius: 100px;
  background: linear-gradient(90deg, #00f2fe, #3b82f6);
  color: #070b14;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 15px rgba(0, 242, 254, 0.4);
  white-space: nowrap;
}
.plan-name {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
}
.plan-price {
  font-size: 42px;
  font-weight: 900;
  color: #fff;
  line-height: 1;
}
.plan-price sup {
  font-size: 20px;
  font-weight: 700;
  color: var(--aero-cyan);
  margin-right: 2px;
}
.plan-price small {
  font-size: 14px;
  color: var(--aero-text-dim);
  font-weight: 500;
}
.plan-sub {
  font-size: 13px;
  color: var(--aero-text-muted);
}
.plan-feats {
  margin: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.plan-feats li {
  font-size: 14px;
  color: #cbd5e1;
  display: flex;
  align-items: center;
  gap: 10px;
}
.plan-feats .ck {
  color: #38bdf8;
  font-weight: 900;
}
.plan-btn {
  padding: 14px;
  font-weight: 700;
  font-size: 15px;
  border-radius: 12px;
  text-align: center;
  margin-top: auto;
}

/* ── Scenarios ── */
.scene-card {
  padding: 24px;
  border-radius: 18px;
  background: var(--aero-bg-card);
  border: 1px solid var(--aero-border);
  display: flex;
  gap: 18px;
  align-items: flex-start;
  transition: all 0.3s ease;
  height: 100%;
}
.scene-card:hover {
  border-color: rgba(56, 189, 248, 0.4);
  background: var(--aero-bg-card-hover);
  transform: translateY(-3px);
}
.scene-icon {
  font-size: 28px;
  flex-shrink: 0;
}
.scene-title {
  font-size: 16px;
  font-weight: 800;
  color: #fff;
}
.scene-desc {
  font-size: 13px;
  color: var(--aero-text-muted);
  line-height: 1.6;
}

/* ── Testimonials ── */
.testi-card {
  padding: 28px;
  border-radius: 20px;
  background: var(--aero-bg-card);
  border: 1px solid var(--aero-border);
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.testi-text {
  font-size: 14px;
  color: #cbd5e1;
  line-height: 1.7;
  font-style: italic;
  margin: 14px 0 20px;
}
.stars {
  color: #f59e0b;
  font-size: 16px;
  letter-spacing: 2px;
}
.avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #00f2fe, #4f46e5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
  font-size: 16px;
}
.author-name {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
}
.author-role {
  font-size: 12px;
  color: var(--aero-text-dim);
}

/* ── FAQ ── */
.faq-accordion .accordion-item {
  background: var(--aero-bg-card);
  border: 1px solid var(--aero-border);
  border-radius: 14px !important;
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-accordion .accordion-button {
  background: transparent;
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  padding: 18px 22px;
  box-shadow: none !important;
}
.faq-accordion .accordion-button:not(.collapsed) {
  color: var(--aero-cyan);
  background: rgba(56, 189, 248, 0.05);
}
.faq-accordion .accordion-button::after {
  filter: invert(1);
}
.faq-accordion .accordion-body {
  font-size: 14px;
  color: var(--aero-text-muted);
  line-height: 1.7;
  padding: 0 22px 20px;
}

/* ── CTA Box ── */
.cta-box {
  background: linear-gradient(135deg, #0c1a33 0%, #061124 50%, #0c1a33 100%);
  border: 1px solid rgba(0, 242, 254, 0.35);
  border-radius: 28px;
  padding: 60px 30px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6), 0 0 40px rgba(0, 242, 254, 0.15);
  position: relative;
  overflow: hidden;
}
.cta-box::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.1), transparent 60%);
  pointer-events: none;
}
.cta-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.5px;
}
.cta-sub {
  font-size: 16px;
  color: #94a3b8;
}
.cta-note {
  font-size: 12px;
  color: var(--aero-text-dim);
}

/* ── Footer ── */
.site-footer {
  background: #04070d;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--aero-text-muted);
}
.footer-logo {
  height: 32px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 0 10px rgba(0, 242, 254, 0.3));
}
.footer-tagline {
  font-size: 13px;
  line-height: 1.7;
  color: var(--aero-text-dim);
}
.fcol-title {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  color: #fff;
  letter-spacing: 0.5px;
}
.fcol a {
  display: block;
  font-size: 13px;
  color: var(--aero-text-muted);
  transition: color 0.2s;
}
.fcol a:hover {
  color: var(--aero-cyan);
}
.footer-copy {
  font-size: 12px;
  color: var(--aero-text-dim);
}

/* ── Subpages (About, Contact, etc.) ── */
.page-hero {
  padding: 50px 0 30px;
  text-align: center;
}
.page-hero-breadcrumb {
  font-size: 13px;
  color: var(--aero-text-dim);
}
.page-hero-breadcrumb a {
  color: var(--aero-cyan);
}
.page-hero-title {
  font-size: 38px;
  font-weight: 900;
  color: #fff;
}
.page-hero-sub {
  font-size: 16px;
  color: var(--aero-text-muted);
}
.content-card {
  background: var(--aero-bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--aero-border);
  border-radius: 24px;
  padding: 40px;
  line-height: 1.8;
  color: #cbd5e1;
}
.content-card h2 {
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  margin-top: 28px;
  margin-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 8px;
}
.content-card h2:first-of-type {
  margin-top: 0;
}
.content-card ul {
  padding-left: 20px;
}
.content-card li {
  margin-bottom: 8px;
}

/* Responsive tweaks */
@media (max-width: 991px) {
  .cockpit-box {
    margin-top: 30px;
  }
}