body.tutorial-page {
  padding-top: 64px;
}
.tutorial-hero {
  position: relative;
  overflow: hidden;
  background-image: url(../images/tutorial/banner.webp);
  background-size: cover;
  background-position: center;
  padding: 32px 0 28px;
}
@media (max-width: 768px) {
  .tutorial-hero {
    background-image: none;
    background:
      radial-gradient(
        ellipse at 80% 10%,
        rgba(75, 150, 255, 0.25) 0,
        rgba(148, 191, 255, 0.12) 30%,
        transparent 60%
      ),
      radial-gradient(
        ellipse at 20% 50%,
        rgba(75, 150, 255, 0.15) 0,
        rgba(148, 191, 255, 0.08) 30%,
        transparent 55%
      ),
      linear-gradient(180deg, #eaf0fa 0, #f0f4fb 40%, #fff 100%);
  }
}
.tutorial-hero-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}
.tutorial-hero-title {
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
  line-height: 1.25;
}
.tutorial-hero-desc {
  font-size: 15px;
  color: var(--text-tertiary);
  line-height: 1.65;
}
.tutorial-featured {
  position: relative;
  z-index: 2;
  margin-top: 32px;
  padding-bottom: 24px;
}
.featured-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.featured-video-card-small {
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 24px;
  padding: 8px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow:
    0 8px 30px rgba(0, 0, 0, 0.04),
    inset 0 1px 0#fff;
}
.featured-video-card-small:hover {
  transform: translateY(-4px);
  box-shadow:
    0 16px 40px rgba(58, 120, 255, 0.08),
    inset 0 1px 0#fff;
  background: rgba(255, 255, 255, 0.95);
  border-color: rgba(58, 120, 255, 0.15);
}
.featured-card-heading {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: center;
  margin: 0 0 2px;
  padding: 10px 12px 0;
  line-height: 1.3;
}
.featured-video-player-small {
  aspect-ratio: 16/9;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.1);
}
.featured-video-player-small::before {
  content: "";
  position: absolute;
  inset: 0;
}
.video-placeholder-large {
  width: 34px;
  height: 34px;
  position: absolute;
  bottom: 10px;
  right: 10px;
  transition:
    transform 0.4s cubic-bezier(0.4, 0, 0.2, 1),
    background 0.4s;
}
.featured-video-card-small:hover .video-placeholder-large {
  transform: scale(1.15);
}
.featured-video-info-small {
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
@media (max-width: 768px) {
  .featured-video-info-small {
    order: 2;
  }
  .featured-video-player-small {
    order: 1;
  }
  .video-placeholder-large {
    width: 20px;
    height: 20px;
    right: 5px;
    bottom: 5px;
  }
}
.featured-badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  background: rgba(239, 68, 68, 0.08);
  color: #ef4444;
  padding: 4px 10px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 10px;
  border: 1px solid rgba(239, 68, 68, 0.15);
}
.featured-title-small {
  font-size: 16px;
  font-weight: 700;
  color: #4b5563;
  line-height: 1.3;
  margin: 0;
}
@media (max-width: 768px) {
  .featured-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .featured-video-card-small {
    flex-direction: row;
    align-items: center;
    padding: 8px;
    border-radius: 16px;
    box-shadow: 0 6px 18px rgba(64, 158, 254, 0.15);
  }
  .featured-video-player-small {
    width: 176px;
    height: 99px;
    flex-shrink: 0;
    border-radius: 12px;
    aspect-ratio: auto;
  }
  .featured-video-info-small {
    padding: 8px 12px;
    flex: 1;
  }
  .featured-badge {
    font-size: 11px;
    padding: 3px 8px;
    margin-bottom: 6px;
  }
  .featured-title-small {
    font-size: 14px;
    font-weight: 700;
    color: #111827;
  }
}
.tutorial-tabs-wrap {
  position: sticky;
  top: 64px;
  z-index: 800;
  background: rgba(252, 253, 255, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  margin-bottom: 0;
  padding: 16px 0;
}
.tutorial-tabs {
  display: flex;
  gap: 4px;
  padding: 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  scroll-snap-type: x proximity;
  background: var(--gray-100);
  border-radius: 12px;
  width: max-content;
  max-width: 100%;
}
.tutorial-tabs::-webkit-scrollbar {
  display: none;
}
.tutorial-tab {
  flex: 0 0 auto;
  scroll-snap-align: start;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  background: 0 0;
  border: 0;
  transition: all 0.2s;
  white-space: nowrap;
  cursor: pointer;
}
.tutorial-tab:hover:not(.active) {
  color: var(--text-primary);
}
.tutorial-tab.active {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}
.tutorial-main {
  padding: 16px 0 64px;
  background: var(--bg-secondary);
}
.tutorial-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 640px) {
  .tutorial-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}
@media (min-width: 1024px) {
  .tutorial-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
.tutorial-list-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow:
    0 4px 20px rgba(15, 23, 42, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.92);
  transition:
    border-color 0.2s,
    box-shadow 0.25s var(--ease-out),
    transform 0.25s var(--ease-out);
  cursor: pointer;
  will-change: transform, box-shadow;
}
.tutorial-list-card:hover {
  border-color: rgba(58, 120, 255, 0.3);
  box-shadow:
    0 20px 40px rgba(15, 23, 42, 0.08),
    0 8px 16px rgba(58, 120, 255, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 1);
  transform: translateY(-4px) scale(1.01);
}
.tutorial-list-card:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
.tutorial-list-card.hidden {
  display: none;
}
.tutorial-card-header {
  padding: 20px;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  font-family: inherit;
  color: inherit;
}
.tutorial-card-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.tutorial-badge-cat {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  gap: 5.15px;
}
.tcat-beginner {
  background: #6b9fdc1a;
  color: #6b9fdc;
}
.tcat-account::before,
.tcat-anti-fraud::before,
.tcat-beginner::before,
.tcat-buy::before,
.tcat-payment::before,
.tcat-recharge::before,
.tcat-sell::before {
  content: "";
  display: inline-block;
  width: 16px;
  height: 16px;
  background-image: url(../images/tutorial/tcat-beginner.webp);
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  flex-shrink: 0;
}
.tcat-payment {
  background: #5a9e6f1a;
  color: #5a9e6f;
}
.tcat-account::before,
.tcat-anti-fraud::before,
.tcat-buy::before,
.tcat-payment::before,
.tcat-recharge::before,
.tcat-sell::before {
  background-image: url(../images/tutorial/tcat-payment.webp);
}
.tcat-buy {
  background: #8b6bbf1a;
  color: #8b6bbf;
}
.tcat-account::before,
.tcat-anti-fraud::before,
.tcat-buy::before,
.tcat-recharge::before,
.tcat-sell::before {
  background-image: url(../images/tutorial/tcat-buy.webp);
}
.tcat-sell {
  background: #b8883a1a;
  color: #b8883a;
}
.tcat-account::before,
.tcat-anti-fraud::before,
.tcat-recharge::before,
.tcat-sell::before {
  background-image: url(../images/tutorial/tcat-sell.webp);
}
.tcat-recharge {
  background: #79bfb91a;
  color: #5a9e97;
}
.tcat-account::before,
.tcat-anti-fraud::before,
.tcat-recharge::before {
  background-image: url(../images/tutorial/tcat-recharge.webp);
}
.tcat-account {
  background: #747b871a;
  color: #747b87;
}
.tcat-account::before,
.tcat-anti-fraud::before {
  background-image: url(../images/tutorial/tcat-account.webp);
}
.tcat-anti-fraud {
  background: #c75c5c1a;
  color: #c75c5c;
}
.tcat-anti-fraud::before {
  background-image: url(../images/tutorial/tcat-anti-fraud.webp);
}
.tutorial-type-badges {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.tutorial-type-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: var(--gray-100);
  color: var(--text-tertiary);
}
.tutorial-type-badge.video {
  background: #fef3c7;
  color: #b45309;
}
.tutorial-card-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  margin: 0;
}
.tutorial-card-desc {
  font-size: 14px;
  color: var(--text-tertiary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin: 0;
  flex: 1;
}
.tutorial-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--gray-100);
  margin-top: auto;
  padding: 12px 20px;
}
.back-to-top,
.tutorial-card-arrow {
  color: var(--primary);
  align-items: center;
}
.tutorial-card-arrow {
  display: inline-flex;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
}
.tutorial-card-arrow svg {
  width: 16px;
  height: 16px;
}
.back-to-top {
  position: fixed;
  bottom: 96px;
  right: 24px;
  z-index: 890;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow:
    0 8px 24px rgba(15, 23, 42, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.95);
  display: flex;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition:
    opacity 0.25s,
    visibility 0.25s,
    transform 0.25s var(--ease-out),
    border-color 0.2s;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  border-color: var(--primary-light);
  box-shadow:
    0 12px 32px rgba(58, 120, 255, 0.18),
    inset 0 1px 0#fff;
}
@media (max-width: 480px) {
  .back-to-top {
    right: 16px;
    bottom: 88px;
  }
}
.tutorial-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1100;
  background: rgba(17, 24, 39, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.3s,
    visibility 0.3s;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
}
.tutorial-modal-overlay.open {
  opacity: 1;
  visibility: visible;
}
.tutorial-modal {
  background: var(--bg-primary);
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
  width: 100%;
  max-width: 720px;
  max-height: min(92vh, 900px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow:
    0 24px 48px rgba(15, 23, 42, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  transform: translateY(100%);
  transition: transform 0.35s var(--ease-out);
}
.tutorial-modal-overlay.open .tutorial-modal {
  transform: translateY(0);
}
@media (min-width: 768px) {
  .tutorial-modal-overlay {
    align-items: center;
    padding: 24px;
  }
  .tutorial-modal {
    border-radius: var(--radius-xl);
    max-height: min(88vh, 820px);
  }
}
.tutorial-modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--gray-100);
  flex-shrink: 0;
}
.tutorial-modal-title-wrap {
  min-width: 0;
}
.tutorial-modal-cat {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 6px;
}
.tutorial-modal-title {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  margin: 0;
}
.tutorial-modal-close {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  transition:
    background 0.2s,
    color 0.2s;
}
.tutorial-modal-close:hover {
  background: var(--gray-100);
  color: var(--text-primary);
}
.tutorial-modal-body {
  overflow-y: auto;
  padding: 20px;
  flex: 1;
  -webkit-overflow-scrolling: touch;
}
.tutorial-step-indicator {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 8px;
}
.tutorial-step-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}
.tutorial-step-dots {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.tutorial-step-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gray-200);
  transition:
    background 0.2s,
    transform 0.2s;
}
.tutorial-step-dot.active {
  background: var(--primary);
  transform: scale(1.15);
}
.tutorial-section-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 16px;
  border-radius: 10px;
  background: var(--gray-100);
  padding: 3px;
}
.tutorial-section-tab {
  flex: 1;
  padding: 8px 16px;
  border: 0;
  background: 0 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}
.tutorial-section-tab.active {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}
.tutorial-section-tab:hover:not(.active) {
  color: var(--text-primary);
}
.tutorial-step-screenshot {
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
}
.tutorial-screenshot-placeholder {
  aspect-ratio: 9/14;
  max-height: 340px;
  background: var(--gray-100);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1.5px dashed var(--gray-300);
}
.tutorial-screenshot-placeholder span {
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-400);
}
.tutorial-step-text {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: 12px;
}
.tutorial-step-tip {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 10px 14px;
  background: #eff6ff;
  border-radius: 8px;
  margin-bottom: 16px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--primary);
}
.tutorial-step-tip svg {
  flex-shrink: 0;
  margin-top: 1px;
}
.tutorial-video-placeholder {
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-700) 100%);
  aspect-ratio: 16/9;
  max-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.85);
  margin-top: 8px;
}
.tutorial-video-placeholder svg {
  opacity: 0.9;
}
.tutorial-video-placeholder p {
  font-size: 13px;
  font-weight: 500;
  margin: 0;
}
.tutorial-modal-nav {
  display: flex;
  gap: 12px;
  padding: 16px 20px 20px;
  border-top: 1px solid var(--gray-100);
  background: var(--bg-primary);
  flex-shrink: 0;
}
.tutorial-modal-nav .btn-primary,
.tutorial-modal-nav .btn-secondary {
  flex: 1;
  justify-content: center;
}
.tutorial-modal-nav .btn-primary:disabled,
.tutorial-modal-nav .btn-secondary:disabled {
  opacity: 0.45;
  pointer-events: none;
  transform: none;
}
.tutorial-related {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--gray-100);
}
.tutorial-related h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.tutorial-related-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.tutorial-related-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: var(--gray-50);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition:
    background 0.2s,
    color 0.2s;
  border: 1px solid transparent;
  width: 100%;
  text-align: left;
  font-family: inherit;
  cursor: pointer;
}
.tutorial-related-link:hover {
  background: var(--primary-bg);
  color: var(--primary);
  border-color: rgba(58, 120, 255, 0.15);
}
body.modal-open {
  overflow: hidden;
}
@media (max-width: 480px) {
  .tutorial-tabs {
    margin: 0 16px;
    width: auto;
  }
  .tutorial-tab {
    padding: 8px 12px;
    font-size: 14px;
  }
}
.tutorial-detail-page {
  padding: 24px 0 60px;
  min-height: 60vh;
}
.td-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-tertiary);
  margin-bottom: 24px;
}
.td-breadcrumb a {
  color: var(--primary);
  text-decoration: none;
}
.td-breadcrumb a:hover {
  text-decoration: underline;
}
.td-breadcrumb svg {
  flex-shrink: 0;
}
.td-header {
  margin-bottom: 24px;
}
.td-header .tutorial-badge-cat {
  margin-bottom: 10px;
}
.td-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 10px;
  line-height: 1.3;
}
.td-section-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 28px;
  border-radius: 12px;
  background: var(--gray-100);
  padding: 4px;
  max-width: 480px;
}
.td-section-tab {
  flex: 1;
  padding: 10px 20px;
  border: 0;
  background: 0 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.td-section-tab.active {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}
.td-section-tab:hover:not(.active) {
  color: var(--text-primary);
}
.td-steps {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
}
.td-step {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
  background: var(--bg-primary);
  border-radius: 20px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 2px 16px rgba(15, 23, 42, 0.04);
  padding: 40px 44px;
  transition:
    box-shadow 0.3s var(--ease-out),
    transform 0.3s var(--ease-out),
    border-color 0.2s;
  scroll-margin-top: 96px;
}
.td-step:hover {
  box-shadow: 0 12px 40px rgba(58, 120, 255, 0.08), 0 4px 12px rgba(15, 23, 42, 0.04);
  border-color: rgba(58, 120, 255, 0.2);
  transform: translateY(-2px);
}
.td-step:nth-of-type(even) .td-step-content {
  order: 2;
}
.td-step:nth-of-type(even) .td-step-media {
  order: 1;
}
.td-step-content {
  min-width: 0;
}
.td-step-label {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.td-step-number {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  padding: 6px 14px;
  border-radius: 999px;
  line-height: 1;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 12px rgba(58, 120, 255, 0.25), inset 0 1px 1px rgba(255, 255, 255, 0.3);
}
.td-step-text {
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-primary);
  margin-bottom: 16px;
  font-weight: 500;
}
.td-step-tip {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(58, 120, 255, 0.04);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--primary);
  border: 1px solid rgba(58, 120, 255, 0.12);
}
.td-step-tip svg {
  flex-shrink: 0;
  margin-top: 2px;
}
.td-step-media {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  width: 100%;
}
.td-step-media img {
  max-width: 100%;
  width: auto;
  max-height: 620px;
  object-fit: contain;
  border-radius: 14px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 8px 32px rgba(15, 23, 42, 0.08);
  display: block;
}
/* 宽图（双拼 / 横版海报）整步通栏：文字在上、大图在下横跨整卡 */
.td-step.td-step-wide {
  grid-template-columns: 1fr;
}
.td-step.td-step-wide .td-step-content,
.td-step.td-step-wide:nth-of-type(even) .td-step-content {
  order: 0;
}
.td-step.td-step-wide .td-step-media,
.td-step.td-step-wide:nth-of-type(even) .td-step-media {
  order: 0;
}
.td-step.td-step-wide .td-step-media img {
  max-height: 620px;
  max-width: 100%;
  width: auto;
}

/* 纯文字步骤（无截图）：单栏通排 */
.td-step.td-step-noimg {
  grid-template-columns: 1fr;
}
.td-step.td-step-noimg .td-step-content,
.td-step.td-step-noimg:nth-of-type(even) .td-step-content {
  order: 0;
}
.td-screenshot-placeholder {
  aspect-ratio: 4/3;
  width: 100%;
  background: linear-gradient(135deg, var(--gray-50), #f1f5f9);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  border: 1.5px dashed var(--gray-200);
}
.td-screenshot-placeholder span {
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-400);
}
.td-progress {
  position: fixed;
  top: 50%;
  right: 24px;
  transform: translateY(-50%);
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 10px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 18px;
  box-shadow:
    0 8px 32px rgba(15, 23, 42, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.3s,
    visibility 0.3s,
    transform 0.3s var(--ease-out);
  max-height: 70vh;
  overflow-y: auto;
  scrollbar-width: none;
}
.td-progress::-webkit-scrollbar {
  display: none;
}
.td-progress.visible {
  opacity: 1;
  visibility: visible;
}
.td-progress-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 10px;
  font-size: 13px;
  color: var(--text-tertiary);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
  white-space: nowrap;
}
.td-progress-item:hover {
  background: rgba(58, 120, 255, 0.06);
  color: var(--text-primary);
}
.td-progress-item.active {
  background: rgba(58, 120, 255, 0.1);
  color: var(--primary);
  font-weight: 600;
}
.td-progress-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--gray-100);
  color: var(--text-tertiary);
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
  transition: all 0.2s;
}
.td-progress-item.active .td-progress-num {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(58, 120, 255, 0.3);
}
.td-progress-text {
  font-size: 13px;
  font-weight: 500;
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -0.01em;
}
.td-video {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--gray-200);
}
.td-related h2,
.td-video h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.td-video-body {
  display: flex;
  flex-direction: column;
  gap: 28px;
  align-items: center;
}
.td-video-item {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.td-video-label {
  align-self: flex-start;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}
.td-video-player {
  display: block;
  max-width: 100%;
  max-height: 78vh;
  width: auto;
  height: auto;
  border-radius: 14px;
  background: #000;
  box-shadow: 0 8px 32px rgba(15, 23, 42, 0.12);
}
.td-related {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--gray-200);
}
.td-related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 16px;
}
.td-related-card {
  display: block;
  padding: 16px 20px;
  background: var(--gray-50);
  border-radius: 12px;
  border: 1px solid var(--gray-200);
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 15px;
  transition: all 0.2s;
}
.td-related-card:hover {
  background: #fff;
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: 0 2px 8px rgba(58, 120, 255, 0.1);
}
@media (max-width: 1024px) {
  .td-progress {
    display: none;
  }
}
@media (max-width: 1024px) {
  .td-step {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 28px 24px;
  }
  .td-step:nth-of-type(even) .td-step-content,
  .td-step:nth-of-type(even) .td-step-media {
    order: unset;
  }
  .td-step-media img {
    max-width: 680px;
    margin: 0 auto;
  }
}
@media (max-width: 768px) {
  .td-title {
    font-size: 22px;
  }
  .td-step {
    padding: 24px 20px;
    border-radius: 16px;
    gap: 20px;
  }
  .td-step-number {
    font-size: 11px;
    padding: 5px 12px;
    letter-spacing: 0.02em;
  }
  .td-step-text {
    font-size: 15px;
  }
  .td-step.td-step-substep .td-step-text {
    font-size: 15px;
  }
  .td-step-media img {
    max-width: 100%;
  }
  .td-screenshot-placeholder,
  .td-section-tabs {
    max-width: 100%;
  }
  /* 竖版手机视频：按手机屏宽度居中显示，不再全屏铺满 */
  .td-video-player {
    max-width: 285px;
    max-height: none;
    margin: 0 auto;
  }
  /* 视频与标题整体居中，平衡且基本不撞右下角悬浮球 */
  .td-video-item {
    align-items: center;
  }
  .td-video-label {
    align-self: center;
  }
}
/* === 横向步骤布局（适用于短流程教程） === */
.td-steps.td-steps-horizontal {
  flex-direction: row;
  flex-wrap: nowrap;
  gap: 20px;
  align-items: stretch;
}
.td-steps.td-steps-horizontal .td-step {
  grid-template-columns: 1fr;
  flex: 1 1 0;
  min-width: 0;
  padding: 28px 24px;
  gap: 20px;
}
.td-steps.td-steps-horizontal .td-step:nth-of-type(even) .td-step-content,
.td-steps.td-steps-horizontal .td-step:nth-of-type(even) .td-step-media {
  order: unset;
}
.td-steps.td-steps-horizontal .td-step-content {
  text-align: center;
}
.td-steps.td-steps-horizontal .td-step-label {
  justify-content: center;
}
.td-steps.td-steps-horizontal .td-step-text {
  font-size: 15px;
}
.td-steps.td-steps-horizontal .td-step-media img {
  max-height: 360px;
  width: auto;
  max-width: 100%;
  margin: 0 auto;
}
.td-steps.td-steps-horizontal .td-step:hover {
  transform: translateY(-4px);
}
@media (max-width: 1024px) {
  .td-steps.td-steps-horizontal {
    flex-direction: column;
  }
}

/* === 子分组标题（如「方式一」「方式二」） === */
.td-step-group-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.02em;
  padding: 8px 0 4px;
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
  scroll-margin-top: 96px;
}
.td-step-group-title::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 18px;
  background: linear-gradient(180deg, var(--primary), rgba(58, 120, 255, 0.4));
  border-radius: 2px;
}
.td-step-group-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(58, 120, 255, 0.18), transparent);
}
.td-steps > .td-step-group-title:first-child {
  margin-top: 0;
}
/* 分组标题图标（替代 emoji，统一线性风格） */
.td-step-group-title.has-icon {
  gap: 8px;
}
.td-step-group-title.has-icon::before {
  display: none;
}
.td-sec-icon {
  display: inline-flex;
  align-items: center;
  flex: none;
}
.td-sec-icon svg {
  width: 18px;
  height: 18px;
  display: block;
}
.td-sec-icon.sec-case { color: var(--primary); }
.td-sec-icon.sec-danger { color: #e5483d; }
.td-sec-icon.sec-ok { color: #16a34a; }

/* === 子步骤（无 step 编号的延续步骤） === */
.td-step.td-step-substep {
  padding: 32px 44px;
  background: linear-gradient(135deg, #fafbff 0%, #fff 100%);
  box-shadow: 0 1px 8px rgba(15, 23, 42, 0.03);
}
.td-step.td-step-substep .td-step-text {
  font-size: 17px;
  color: var(--text-primary);
  font-weight: 500;
}

/* === 进度指示器内的分组分隔标签 === */
.td-progress-divider {
  padding: 8px 12px 4px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 6px;
  border-top: 1px solid rgba(0, 0, 0, 0.06);
}
.td-progress-divider:first-child {
  border-top: 0;
  margin-top: 0;
  padding-top: 2px;
}
.td-progress-divider.has-icon {
  display: flex;
  align-items: center;
  gap: 6px;
}
.td-progress-divider.has-icon .td-sec-icon svg {
  width: 14px;
  height: 14px;
}

@media (max-width: 1024px) {
  .td-step.td-step-substep {
    padding: 24px 24px;
  }
  .td-step-group-title {
    font-size: 14px;
    padding: 4px 0;
  }
}
@media (max-width: 768px) {
  .td-step.td-step-substep {
    padding: 20px 20px;
    border-radius: 14px;
  }
}

/* === 移动端教程中心：收紧首屏 + 列表卡片默认可见 === */
@media (max-width: 768px) {
  /* 1. 收紧首屏高度，让教程列表的第一行能透出在折叠线附近 */
  .tutorial-hero {
    padding: 18px 0 14px;
  }
  .tutorial-hero-desc {
    font-size: 14px;
  }
  .tutorial-featured {
    margin-top: 16px;
    padding-bottom: 16px;
  }
  .tutorial-tabs-wrap {
    padding: 12px 0;
  }
  .tutorial-main {
    padding-top: 12px;
  }
  /* 2. 列表卡片默认即可见，不依赖滚动淡入，避免首屏一片空白 */
  .tutorial-list-card.anim-fade-up {
    opacity: 1;
    transform: none;
    transition: none;
  }
}