.page-faq {
  --color-neon-green: #39FF14;
  --color-electric-blue: #00BFFF;
  --color-fire-orange: #FF4500;
  --color-bg-dark: #0D0D0D;
  --color-bg-medium: #1A1A1A;
  --color-border: #333333;
  --color-text-white: #FFFFFF;
  --color-text-gray: #888888;
  --color-text-muted: #666666;
  --faq-gradient-tab: linear-gradient(135deg, var(--color-neon-green), var(--color-electric-blue));
  --faq-gradient-accent: linear-gradient(90deg, var(--color-electric-blue), var(--color-fire-orange));
  --faq-card-bg: #141414;
  --faq-summary-hover: rgba(57, 255, 20, 0.06);
  --faq-radius: 8px;

  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 20px 80px;
  font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--color-bg-dark);
  color: var(--color-text-white);
  line-height: 1.6;
}

/* breadcrumb */
.faq-hero .faq-breadcrumb {
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}
.faq-hero .faq-breadcrumb a {
  color: var(--color-text-gray);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}
.faq-hero .faq-breadcrumb a:hover {
  color: var(--color-text-white);
  border-bottom-color: var(--color-neon-green);
}
.breadcrumb-sep {
  margin: 0 8px;
  color: var(--color-border);
}

/* hero */
.faq-title {
  font-family: 'Orbitron', 'Arial Black', sans-serif;
  font-weight: 900;
  font-size: clamp(32px, 6vw, 56px);
  letter-spacing: 0.1em;
  margin: 0 0 4px;
  line-height: 1.2;
  text-transform: uppercase;
  background: var(--faq-gradient-tab);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.faq-subtitle {
  font-size: clamp(16px, 2.5vw, 22px);
  color: var(--color-text-gray);
  margin: 0 0 24px;
  font-weight: 400;
  letter-spacing: 0.04em;
}

/* search */
.faq-search {
  position: relative;
  max-width: 480px;
  margin-bottom: 40px;
}
.faq-search .faq-search-input {
  width: 100%;
  padding: 14px 20px 14px 48px;
  font-size: 16px;
  font-family: 'Inter', sans-serif;
  background-color: var(--color-bg-medium);
  border: 1px solid var(--color-border);
  border-radius: 40px;
  color: var(--color-text-white);
  outline: none;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.faq-search .faq-search-input::placeholder {
  color: var(--color-text-muted);
}
.faq-search .faq-search-input:focus {
  border-color: var(--color-electric-blue);
  box-shadow: 0 0 0 3px rgba(0, 191, 255, 0.2);
}
.faq-search .faq-search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  pointer-events: none;
}

/* tabs */
.faq-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0;
}
.faq-tabs .faq-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 20px;
  font-family: 'Orbitron', 'Arial Black', sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-gray);
  background: transparent;
  border: none;
  border-radius: var(--faq-radius) var(--faq-radius) 0 0;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
}
.faq-tabs .faq-tab::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: transparent;
  transition: background 0.3s;
}
.faq-tabs .faq-tab:hover {
  color: var(--color-text-white);
  background: rgba(255,255,255,0.03);
}
.faq-tabs .faq-tab.active {
  color: var(--color-text-white);
  background: var(--faq-card-bg);
}
.faq-tabs .faq-tab.active::after {
  background: var(--faq-gradient-accent);
}
.faq-tabs .faq-tab .tab-icon {
  font-size: 10px;
  color: var(--color-neon-green);
  opacity: 0.7;
}
.faq-tabs .faq-tab.active .tab-icon {
  opacity: 1;
}

/* panels */
.faq-panel {
  display: none;
  animation: faqFadeIn 0.4s ease forwards;
}
.faq-panel.active {
  display: block;
}
@keyframes faqFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}
.panel-heading {
  font-family: 'Orbitron', 'Arial Black', sans-serif;
  font-size: clamp(22px, 4vw, 36px);
  font-weight: 900;
  letter-spacing: 0.06em;
  margin: 0 0 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-border);
  color: var(--color-text-white);
}

/* guide image */
.faq-image-block {
  margin-bottom: 32px;
}
.faq-image-block .faq-guide-img {
  max-width: 100%;
  height: auto;
  border-radius: var(--faq-radius);
  border: 1px solid var(--color-border);
  background: var(--color-bg-medium);
  display: block;
  object-fit: contain;
}

/* question group */
.faq-group {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.faq-item {
  background: var(--faq-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--faq-radius);
  overflow: hidden;
  transition: border-color 0.3s;
}
.faq-item[open] {
  border-color: var(--color-electric-blue);
}
.faq-item .faq-question {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 24px;
  font-family: 'Inter', sans-serif;
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text-white);
  background: transparent;
  cursor: pointer;
  list-style: none;
  transition: background 0.2s;
  user-select: none;
}
.faq-item .faq-question::-webkit-details-marker {
  display: none;
}
.faq-item .faq-question::marker {
  display: none;
}
.faq-item .faq-question:hover {
  background: var(--faq-summary-hover);
}
.faq-item .faq-question .q-mark {
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-weight: 700;
  font-size: 14px;
  line-height: 1;
  min-width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--faq-gradient-tab);
  color: var(--color-bg-dark);
}
.faq-item .faq-answer {
  padding: 0 24px 20px 64px;
  font-size: 16px;
  color: var(--color-text-gray);
  line-height: 1.7;
}
.faq-item .faq-answer p {
  margin: 0;
}
.faq-item .faq-answer a {
  color: var(--color-electric-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s;
}
.faq-item .faq-answer a:hover {
  color: var(--color-neon-green);
}

/* cta area */
.faq-cta {
  margin-top: 56px;
  padding: 28px 24px;
  text-align: center;
  border: 1px solid var(--color-border);
  border-radius: var(--faq-radius);
  background: var(--faq-card-bg);
}
.faq-cta p {
  margin: 0;
  font-size: 18px;
  color: var(--color-text-gray);
}
.faq-cta a {
  color: var(--color-neon-green);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}
.faq-cta a:hover {
  border-bottom-color: var(--color-neon-green);
  color: var(--color-text-white);
}

/* responsive */
@media (max-width: 640px) {
  .page-faq {
    padding: 24px 16px 60px;
  }
  .faq-title {
    font-size: 28px;
  }
  .faq-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 4px;
    padding-bottom: 4px;
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
  }
  .faq-tabs .faq-tab {
    flex-shrink: 0;
    padding: 10px 14px;
    font-size: 11px;
  }
  .faq-item .faq-question {
    padding: 14px 16px;
    font-size: 15px;
  }
  .faq-item .faq-answer {
    padding: 0 16px 16px 48px;
    font-size: 15px;
  }
  .faq-item .faq-question .q-mark {
    min-width: 24px;
    height: 24px;
    font-size: 12px;
  }
  .panel-heading {
    font-size: 22px;
  }
}

@media (min-width: 1024px) {
  .faq-image-block .faq-guide-img {
    max-width: 500px;
  }
}