/* ============================================================
   Phase 2 — Features, Advantages, Pricing, CTA, Clients, FAQ
   ============================================================ */

/* ---- Features (六大核心能力) ---- */
.features-section {
  padding: 80px 24px;
  background: radial-gradient(circle at 50% 50%, #1e293b 0%, var(--color-bg-dark) 100%);
  position: relative;
  overflow: hidden;
}

.features-section::before,
.features-section::after {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.features-section::before {
  top: -120px;
  right: -120px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.12) 0%, transparent 70%);
}

.features-section::after {
  bottom: -120px;
  left: -120px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
}

.features-header {
  text-align: center;
  margin-bottom: 48px;
  position: relative;
  z-index: 1;
}

.features-title {
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 800;
  color: var(--color-white);
  margin: 0 0 12px;
  letter-spacing: 1px;
}

.features-title::after {
  content: '';
  display: block;
  width: 64px;
  height: 4px;
  background: var(--color-primary);
  margin: 20px auto 0;
  border-radius: 2px;
}

.features-subtitle {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.65);
  margin: 16px 0 0;
  font-weight: 400;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: var(--container-max);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.feature-card {
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(37, 99, 235, 0.35);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.25);
}

.feature-icon-box {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-md);
  background: rgba(37, 99, 235, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.feature-icon {
  font-size: 30px;
  color: #93c5fd;
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin: 0 0 12px;
}

.feature-desc {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.75;
}

/* ---- Advantages subsection (merged) ---- */
.advantages-subsection {
  margin-top: 64px;
  position: relative;
  z-index: 1;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
}

.advantages-subsection-title {
  text-align: center;
  font-size: 24px;
  font-weight: 700;
  color: var(--color-white);
  margin: 0 0 32px;
}

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

.advantage-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

.advantage-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.card-img-box {
  height: 180px;
  overflow: hidden;
}

.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.advantage-card:hover .card-img {
  transform: scale(1.04);
}

.card-content {
  padding: 22px 22px 26px;
}

.card-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 8px;
}

.card-sub {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.card-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.card-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 8px;
}

.card-list li i {
  color: var(--color-success);
  margin-top: 4px;
  flex-shrink: 0;
}

@media (max-width: 1024px) {
  .features-grid,
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .features-grid,
  .advantages-grid {
    grid-template-columns: 1fr;
  }

  .features-section {
    padding: 56px 20px;
  }
}

/* ---- Pricing ---- */
.pricing-section {
  padding: 80px 24px;
  background: var(--color-bg);
}

.pricing-title {
  font-size: clamp(28px, 4vw, 36px);
  text-align: center;
  margin: 0 0 48px;
  font-weight: 800;
  color: var(--color-text);
}

.pricing-title::after {
  content: '';
  display: block;
  width: 56px;
  height: 4px;
  background: var(--color-primary);
  margin: 16px auto 0;
  border-radius: 2px;
}

.pricing-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1280px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px 22px;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.pricing-card.featured {
  border: 2px solid var(--color-primary);
  box-shadow: 0 12px 32px rgba(37, 99, 235, 0.15);
}

.pricing-card.featured:hover {
  transform: translateY(-6px);
}

.badge-popular {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: var(--color-white);
  padding: 5px 16px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

.pricing-card.featured {
  position: relative;
}

.pricing-header {
  text-align: center;
  padding-bottom: 20px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.pricing-plan-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.pricing-price {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
}

.pricing-price span {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
}

.pricing-note {
  display: inline-block;
  margin-top: 10px;
  font-size: 12px;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 10px;
  border-radius: 999px;
}

.pricing-features {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 10px;
  line-height: 1.5;
}

.pricing-features li i {
  color: var(--color-success);
  margin-top: 3px;
  flex-shrink: 0;
}

.pricing-btn {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--color-primary);
  background: transparent;
  color: var(--color-primary);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.pricing-btn:hover,
.pricing-card.featured .pricing-btn {
  background: var(--color-primary);
  color: var(--color-white);
}

@media (max-width: 1024px) {
  .pricing-container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .pricing-container {
    grid-template-columns: 1fr;
  }
}

/* ---- Clients ---- */
.clients-section {
  padding: 64px 24px;
  background: var(--color-white);
}

.clients-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.clients-header {
  text-align: center;
  margin-bottom: 36px;
}

.clients-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-text);
  margin: 0 0 8px;
}

.clients-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--color-primary);
  margin: 12px auto 0;
  border-radius: 2px;
}

.clients-subtitle {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-top: 12px;
}

.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.client-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.client-item:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.client-icon {
  color: var(--color-primary);
  font-size: 8px;
}

.client-name {
  font-size: 13px;
  color: var(--color-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

@media (max-width: 900px) {
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ---- Final CTA ---- */
.final-cta-section {
  background: linear-gradient(135deg, #1e40af 0%, var(--color-primary) 50%, #3b82f6 100%);
  padding: 72px 24px;
  text-align: center;
  color: var(--color-white);
}

.final-cta-container {
  max-width: 640px;
  margin: 0 auto;
}

.final-cta-title {
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  margin: 0 0 12px;
  line-height: 1.35;
}

.final-cta-middle-text {
  font-size: 14px;
  opacity: 0.9;
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.final-cta-slogan {
  font-size: clamp(20px, 3vw, 26px);
  margin-bottom: 28px;
  font-weight: 500;
}

.final-cta-btn {
  background: var(--color-white);
  color: var(--color-primary);
  border: none;
  padding: 14px 36px;
  font-size: 16px;
  font-weight: 700;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  font-family: inherit;
}

.final-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.final-cta-icon {
  margin-bottom: 16px;
  opacity: 0.85;
}

.final-cta-icon svg {
  stroke: var(--color-white);
}

/* ---- FAQ Accordion ---- */
.faq-section {
  padding: 80px 24px;
  background: var(--color-bg-dark);
  color: var(--color-white);
}

.faq-container {
  max-width: 880px;
  margin: 0 auto;
}

.faq-header {
  margin-bottom: 36px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.faq-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-white);
  margin: 0;
}

.faq-title::after {
  content: '';
  display: block;
  width: 100%;
  height: 3px;
  background: var(--color-primary);
  margin-top: 12px;
  border-radius: 2px;
}

.faq-list {
  display: flex;
  flex-direction: column;
}

.faq-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.faq-question {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 20px 36px 20px 0;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  user-select: none;
  line-height: 1.5;
}

.faq-question::after {
  content: '+';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 300;
  color: var(--color-primary);
  transition: transform var(--transition);
}

.faq-item.open .faq-question::after {
  content: '−';
}

.faq-q-mark {
  color: var(--color-primary);
  font-weight: 800;
  flex-shrink: 0;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease, opacity 0.25s ease;
  opacity: 0;
  padding: 0 0 0 28px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.75;
}

.faq-item.open .faq-answer {
  max-height: 600px;
  opacity: 1;
  padding: 0 0 20px 28px;
}

.faq-highlight {
  color: #93c5fd;
  font-weight: 600;
}

.faq-answer ul {
  padding-left: 18px;
  margin: 8px 0;
}

.faq-answer p {
  margin: 0 0 8px;
}