/* components.css — All section and component styles */

/* ── Section shared ── */
section {
  padding: 0 32px;
  content-visibility: auto;
  contain-intrinsic-size: auto 600px;
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-header {
  margin-bottom: 56px;
}

.section-eyebrow {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.section-desc {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 640px;
  margin-top: 16px;
  line-height: 1.6;
}

/* ── AI Primer ── */
.ai-primer {
  padding-bottom: var(--section-gap);
}

.primer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}

.primer-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  padding: 40px 32px;
  transition: background 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}

.primer-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.primer-card:hover {
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 8px 32px rgba(26, 115, 232, 0.08);
}

.primer-card:hover::before {
  opacity: 1;
}

.primer-number {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 20px;
}

.primer-card h3 {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

.primer-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
}

.primer-card .fun-fact {
  margin-top: 20px;
  padding: 14px 18px;
  background: rgba(26, 115, 232, 0.04);
  border: 1px solid rgba(26, 115, 232, 0.1);
  border-radius: 12px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.primer-card .fun-fact strong {
  color: var(--accent);
  font-weight: 600;
}

/* ── AI Tools Introduction ── */
.ai-tools-intro {
  position: relative;
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
  background: linear-gradient(180deg, rgba(243, 245, 248, 0.9) 0%, rgba(232, 242, 255, 0.95) 100%);
  overflow: hidden;
}

.ai-tools-intro::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(26, 115, 232, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.ai-tools-intro::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(26, 115, 232, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.4;
  pointer-events: none;
}

.ai-tools-intro .section-inner {
  position: relative;
  z-index: 1;
}

.ai-tools-intro .section-header {
  text-align: center;
  margin-bottom: 64px;
}

.ai-tools-intro .section-header .section-title {
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.ai-tools-intro .section-header .section-desc {
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.ai-tools-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.ai-tool-category {
  position: relative;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(26, 115, 232, 0.15);
  border-radius: 24px;
  padding: 40px;
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  overflow: hidden;
}

.ai-tool-category::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--cat-color, #1a73e8), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.ai-tool-category::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(26, 115, 232, 0.03) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.4s, transform 0.4s;
  transform: scale(0.8);
}

.ai-tool-category:hover {
  transform: translateY(-6px);
  box-shadow:
    0 20px 60px rgba(26, 115, 232, 0.15),
    0 0 0 1px rgba(26, 115, 232, 0.2);
  border-color: rgba(26, 115, 232, 0.3);
}

.ai-tool-category:hover::before {
  opacity: 1;
}

.ai-tool-category:hover::after {
  opacity: 1;
  transform: scale(1);
}

.ai-tool-category[data-category="chat"] { --cat-color: #1a73e8; }
.ai-tool-category[data-category="code"] { --cat-color: #6366f1; }
.ai-tool-category[data-category="office"] { --cat-color: #06b6d4; }
.ai-tool-category[data-category="creative"] { --cat-color: #f59e0b; }

.ai-tool-category h3 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 14px;
  position: relative;
  z-index: 1;
}

.ai-tool-category h3 .icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  transition: transform 0.3s;
}

.ai-tool-category[data-category="chat"] h3 .icon {
  background: linear-gradient(135deg, rgba(26, 115, 232, 0.15) 0%, rgba(26, 115, 232, 0.05) 100%);
  box-shadow: 0 4px 16px rgba(26, 115, 232, 0.15);
}

.ai-tool-category[data-category="code"] h3 .icon {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(99, 102, 241, 0.05) 100%);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.15);
}

.ai-tool-category[data-category="office"] h3 .icon {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.15) 0%, rgba(6, 182, 212, 0.05) 100%);
  box-shadow: 0 4px 16px rgba(6, 182, 212, 0.15);
}

.ai-tool-category[data-category="creative"] h3 .icon {
  background: linear-gradient(135deg, rgba(249, 115, 22, 0.15) 0%, rgba(249, 115, 22, 0.05) 100%);
  box-shadow: 0 4px 16px rgba(249, 115, 22, 0.15);
}

.ai-tool-category:hover h3 .icon {
  transform: scale(1.1) rotate(3deg);
}

.ai-tool-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
  z-index: 1;
}

.ai-tool-list li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.6);
  border-radius: 14px;
  border: 1px solid rgba(26, 115, 232, 0.08);
  transition: all 0.3s;
}

.ai-tool-list li:hover {
  background: rgba(255, 255, 255, 0.95);
  border-color: rgba(26, 115, 232, 0.2);
  transform: translateX(6px);
  box-shadow: 0 4px 20px rgba(26, 115, 232, 0.08);
}

.ai-tool-list .tool-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.ai-tool-list .tool-name::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cat-color, var(--accent));
  flex-shrink: 0;
}

.ai-tool-list .tool-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  padding-left: 14px;
}

.ai-tool-list .tool-try {
  font-size: 12px;
  color: var(--accent);
  padding-left: 14px;
  margin-top: 2px;
  font-weight: 500;
  opacity: 0.8;
}

/* Glow badge for each category */
.ai-tool-category .glow-dot {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cat-color, var(--accent));
  box-shadow: 0 0 12px var(--cat-color, var(--accent)), 0 0 24px var(--cat-color, var(--accent));
  animation: glow-pulse 2s ease-in-out infinite;
}

@keyframes glow-pulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.2); }
}

/* ── Scenarios ── */
.scenarios {
  position: relative;
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
}

.scenarios::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80%;
  height: 60%;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.04) 0%, transparent 70%);
  pointer-events: none;
}

.scenarios .section-inner {
  position: relative;
  z-index: 1;
}

.scenario-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.scenario-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  transition: box-shadow 0.4s, transform 0.4s;
  position: relative;
}

.scenario-card:hover {
  box-shadow: 0 16px 48px rgba(26, 115, 232, 0.12);
  transform: translateY(-4px);
}

.scenario-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #6366f1, #06b6d4);
  opacity: 0;
  transition: opacity 0.3s;
}

.scenario-card:hover::after {
  opacity: 1;
}

.scenario-header {
  padding: 32px 32px 0;
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.scenario-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
  background: linear-gradient(135deg, rgba(26, 115, 232, 0.1) 0%, rgba(99, 102, 241, 0.1) 100%);
}

.scenario-tag {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: rgba(26, 115, 232, 0.08);
  padding: 3px 10px;
  border-radius: 8px;
  display: inline-block;
  margin-bottom: 8px;
}

.scenario-header h3 {
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.scenario-body {
  padding: 20px 32px 32px;
}

.scenario-problem {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
  padding-left: 16px;
  border-left: 2px solid rgba(26, 115, 232, 0.2);
  font-style: italic;
}

.scenario-solution {
  font-size: 15px;
  color: var(--text);
  line-height: 1.65;
}

.scenario-wow {
  margin-top: 16px;
  padding: 12px 16px;
  background: linear-gradient(135deg, rgba(26, 115, 232, 0.04), rgba(99, 102, 241, 0.04));
  border-radius: 12px;
  border: 1px solid rgba(26, 115, 232, 0.08);
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.scenario-wow strong {
  color: var(--accent);
  font-weight: 600;
}

/* ── AI Frontier ── */
.frontier {
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
  background: linear-gradient(180deg, rgba(243, 245, 248, 0.9) 0%, rgba(237, 242, 250, 0.95) 100%);
  position: relative;
}

.frontier::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(26, 115, 232, 0.06) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.5;
  pointer-events: none;
}

.frontier .section-inner {
  position: relative;
  z-index: 1;
}

.frontier-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
}

.news-list {
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}

.news-item {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 24px;
  padding: 28px 32px;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
}

.news-item:last-child {
  border-bottom: none;
}

.news-item:hover {
  background: rgba(26, 115, 232, 0.03);
}

.news-date {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
  padding-top: 4px;
}

.news-content h4 {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  line-height: 1.35;
}

.news-content p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.news-category {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 6px;
}

.frontier-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-card {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(26, 115, 232, 0.1);
  border-radius: 16px;
  padding: 28px;
  box-shadow: 0 4px 24px rgba(26, 115, 232, 0.04);
}

.sidebar-card h4 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.trend-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.trend-list li {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.55;
  padding-left: 14px;
  position: relative;
}

.trend-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.trend-list strong {
  color: var(--text);
  font-weight: 500;
}

/* ── Insights ── */
.insights {
  position: relative;
  background: linear-gradient(180deg, rgba(243, 245, 248, 0.5) 0%, var(--bg) 100%);
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
}

.article-layout {
  display: grid;
  /* 桌面：主区填满列宽 + 侧边栏 300px，让标题/正文更舒展 */
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}

.article-layout + .article-layout {
  margin-top: 88px;
}

.article-card {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  min-width: 0; /* allow grid item to shrink without overflowing */
}

.article-header {
  /* 流式 padding：手机 24px / 桌面 56px */
  padding: clamp(28px, 4.5vw, 56px) clamp(24px, 4.5vw, 56px) clamp(20px, 3vw, 36px);
  border-bottom: 1px solid var(--border);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.article-meta span {
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  background: rgba(26, 115, 232, 0.08);
  padding: 4px 12px;
  border-radius: 12px;
}

.article-title {
  /* 标题字号自适应，平板和手机都能舒适阅读 */
  font-size: clamp(24px, 3.2vw, 38px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 20px;
  /* 限制标题行宽，避免超宽屏时一行字过长 */
  max-width: 22ch;
}

.article-lead {
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 56ch;
}

.article-body {
  /* 同样的流式 padding */
  padding: clamp(24px, 3.5vw, 44px) clamp(24px, 4.5vw, 56px) clamp(28px, 4vw, 52px);
}

.article-body > h3,
.article-body > p,
.article-body > .article-quote {
  /* 最佳阅读行宽 ≈60-75 中文字符，自适应字号 */
  max-width: 68ch;
}

.article-body h3 {
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: clamp(28px, 3vw, 40px) 0 16px;
  line-height: 1.3;
}

.article-body h3:first-child {
  margin-top: 0;
}

.article-body p {
  font-size: clamp(15px, 1.4vw, 16px);
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.article-body p:last-child {
  margin-bottom: 0;
}

.article-quote {
  margin: 28px 0;
  padding: clamp(18px, 2.5vw, 24px) clamp(20px, 2.8vw, 28px);
  border-left: 3px solid var(--accent);
  background: rgba(26, 115, 232, 0.04);
  border-radius: 0 12px 12px 0;
}

.article-quote p {
  font-size: clamp(15px, 1.5vw, 17px);
  color: var(--text);
  font-weight: 500;
  line-height: 1.6;
  margin: 0;
}

.article-quote cite {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-muted);
  font-style: normal;
  font-weight: 400;
}

.article-sidebar {
  position: sticky;
  top: 100px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.insight-panel {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
}

.insight-panel h4 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* 替代原内联样式：统一侧边栏描述文字的节奏 */
.insight-panel-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.insight-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.insight-list li {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.55;
  padding-left: 14px;
  position: relative;
}

.insight-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.btn-video {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px 20px;
  background: var(--text);
  color: #fff;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s;
}

.btn-video:hover {
  background: #333;
  color: #fff;
}

/* ── CTA Banner ── */
.cta-banner {
  position: relative;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  color: #fff;
  padding: 80px 32px;
  overflow: hidden;
  text-align: center;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(26, 115, 232, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 115, 232, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.cta-banner::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(26, 115, 232, 0.15) 0%, transparent 70%);
  filter: blur(60px);
  pointer-events: none;
}

.cta-inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
}

.cta-inner h2 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 20px;
}

.cta-inner p {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.6;
  margin-bottom: 36px;
}

.cta-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.cta-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  color: var(--text);
  padding: 14px 28px;
  border-radius: 28px;
  font-size: 15px;
  font-weight: 500;
  transition: background 0.2s, transform 0.15s;
}

.cta-link:hover {
  background: #e8eaed;
  transform: translateY(-1px);
}

.cta-link.outline {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.cta-link.outline:hover {
  border-color: rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.08);
}

/* ── Footer ── */
footer {
  position: relative;
  z-index: 1;
  background: #0a0f1a;
  color: rgba(255, 255, 255, 0.45);
  padding: 32px;
  border-top: 1px solid rgba(26, 115, 232, 0.15);
}

/* ── Learning Courses ── */
.learning-courses {
  position: relative;
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
  background: linear-gradient(180deg, rgba(243, 245, 248, 0.6) 0%, var(--bg) 100%);
}

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

.learning-card {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px;
  transition: box-shadow 0.4s, transform 0.4s;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.learning-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #6366f1, #06b6d4);
  opacity: 0;
  transition: opacity 0.3s;
}

.learning-card:hover {
  box-shadow: 0 16px 48px rgba(26, 115, 232, 0.12);
  transform: translateY(-4px);
}

.learning-card:hover::before {
  opacity: 1;
}

.learning-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.learning-icon {
  font-size: 28px;
  line-height: 1;
}

.learning-card-header h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.learning-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  background: rgba(26, 115, 232, 0.08);
  padding: 2px 10px;
  border-radius: 8px;
  display: inline-block;
  margin-top: 4px;
}

.learning-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
}

.course-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.course-list li a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  padding: 10px 14px;
  border-radius: 10px;
  background: rgba(26, 115, 232, 0.03);
  border: 1px solid rgba(26, 115, 232, 0.06);
  transition: all 0.25s;
}

.course-list li a:hover {
  background: rgba(26, 115, 232, 0.07);
  border-color: rgba(26, 115, 232, 0.15);
  transform: translateX(4px);
}

.course-list cite {
  font-size: 12px;
  color: var(--text-muted);
  font-style: normal;
  font-weight: 400;
  flex-shrink: 0;
}

.learning-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  transition: gap 0.2s;
}

.learning-cta:hover {
  gap: 10px;
}

/* ── Quick FAQ ── */
.quick-faq {
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
}

.faq-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.faq-item {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  transition: box-shadow 0.3s, transform 0.3s;
}

.faq-item:hover {
  box-shadow: 0 8px 32px rgba(26, 115, 232, 0.08);
  transform: translateY(-2px);
}

.faq-item h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}

.faq-item p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── TL;DR Summary Boxes ── */
.section-tldr {
  margin-top: 40px;
  padding: 24px 28px;
  background: linear-gradient(135deg, rgba(26, 115, 232, 0.03), rgba(99, 102, 241, 0.03));
  border: 1px solid rgba(26, 115, 232, 0.12);
  border-left: 3px solid var(--accent);
  border-radius: 0 14px 14px 0;
}

.section-tldr h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
}

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

.section-tldr li {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  padding-left: 18px;
  position: relative;
}

.section-tldr li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 600;
}

/* ── Tool Comparison Table ── */
.tool-comparison {
  margin-top: 48px;
}

.comparison-title {
  font-size: 20px;
  font-weight: 500;
  margin-bottom: 24px;
  text-align: center;
  letter-spacing: -0.01em;
}

.comparison-table-wrap {
  overflow-x: auto;
  border-radius: 14px;
  border: 1px solid var(--border);
}

.tool-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.tool-table thead {
  background: rgba(26, 115, 232, 0.06);
}

.tool-table th {
  padding: 14px 18px;
  text-align: left;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}

.tool-table td {
  padding: 14px 18px;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
}

.tool-table tbody tr:nth-child(even) {
  background: rgba(26, 115, 232, 0.02);
}

.tool-table tbody tr {
  transition: background 0.2s;
}

.tool-table tbody tr:hover {
  background: rgba(26, 115, 232, 0.05);
}

/* ── Author & Final Summary ── */
.author-summary {
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
}

.about-author {
  margin-bottom: 48px;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px;
}

.author-info {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.author-avatar {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  background: linear-gradient(135deg, rgba(26, 115, 232, 0.1), rgba(99, 102, 241, 0.1));
  flex-shrink: 0;
}

.author-text h4 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.author-text p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.final-summary {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 48px;
}

.final-summary h2 {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.summary-point {
  padding: 20px;
  background: rgba(26, 115, 232, 0.03);
  border-radius: 14px;
  border: 1px solid rgba(26, 115, 232, 0.08);
  transition: border-color 0.3s;
}

.summary-point:hover {
  border-color: rgba(26, 115, 232, 0.2);
}

.summary-num {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  background: rgba(26, 115, 232, 0.08);
  padding: 2px 10px;
  border-radius: 8px;
  display: inline-block;
  margin-bottom: 10px;
}

.summary-point h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.summary-point p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

.summary-closing {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
  font-weight: 500;
}

/* ── Author Channels ── */
.author-channels {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.channel-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-radius: 10px;
  background: rgba(26, 115, 232, 0.03);
  border: 1px solid rgba(26, 115, 232, 0.08);
  font-size: 14px;
  color: var(--text);
  text-decoration: none;
  transition: all 0.25s;
}

.channel-link:hover {
  background: rgba(26, 115, 232, 0.07);
  border-color: rgba(26, 115, 232, 0.18);
  transform: translateX(4px);
}

.channel-icon {
  font-size: 18px;
  flex-shrink: 0;
}

.channel-link strong {
  color: var(--accent);
  font-weight: 600;
}

/* ── Footer Expanded ── */
.footer-brand {
  margin-bottom: 24px;
}

.footer-logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #4da3ff, #6366f1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-tagline {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.35);
  margin-top: 6px;
  line-height: 1.5;
}

.footer-channels {
  margin-bottom: 24px;
}

.footer-channel-group h4 {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.4);
  margin-bottom: 12px;
}

.footer-channel-group a {
  display: block;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.35);
  text-decoration: none;
  padding: 4px 0;
  transition: color 0.2s;
}

.footer-channel-group a:hover {
  color: rgba(255, 255, 255, 0.65);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 12px;
}

/* ── Tech Investment ── */
.tech-invest {
  position: relative;
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
  background: linear-gradient(180deg, var(--bg) 0%, rgba(243, 245, 248, 0.4) 50%, var(--bg) 100%);
}

.invest-articles {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.invest-card {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px;
  position: relative;
  overflow: hidden;
}

.invest-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #6366f1, #f59e0b);
}

.invest-card-top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.invest-badge {
  font-size: 11px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), #6366f1);
  padding: 4px 12px;
  border-radius: 8px;
}

.invest-date {
  font-size: 13px;
  color: var(--text-muted);
}

.invest-card h3 {
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  line-height: 1.3;
}

.invest-lead {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 28px;
}

.invest-lead strong {
  color: var(--text);
}

/* Metrics Grid */
.invest-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 32px;
  padding: 24px;
  background: rgba(26, 115, 232, 0.03);
  border-radius: 14px;
  border: 1px solid rgba(26, 115, 232, 0.08);
}

.metric {
  text-align: center;
  padding: 12px 8px;
}

.metric-value {
  display: block;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.metric-label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Analysis */
.invest-analysis {
  margin-bottom: 28px;
}

.invest-analysis h4 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
  margin-top: 20px;
}

.invest-analysis h4:first-child {
  margin-top: 0;
}

.invest-analysis p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 10px;
}

.invest-analysis strong {
  color: var(--text);
}

/* Highlights Grid (WWDC) */
.invest-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 28px;
}

.highlight-item {
  padding: 20px;
  background: rgba(26, 115, 232, 0.02);
  border: 1px solid rgba(26, 115, 232, 0.06);
  border-radius: 14px;
  transition: border-color 0.3s;
}

.highlight-item:hover {
  border-color: rgba(26, 115, 232, 0.15);
}

.highlight-item h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.highlight-item p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Takeaway */
.invest-takeaway {
  padding: 20px 24px;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.04), rgba(239, 68, 68, 0.03));
  border: 1px solid rgba(245, 158, 11, 0.15);
  border-radius: 14px;
  margin-bottom: 24px;
}

.invest-takeaway h4 {
  font-size: 15px;
  font-weight: 600;
  color: #d97706;
  margin-bottom: 8px;
}

.invest-takeaway p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.invest-takeaway strong {
  color: var(--text);
}

/* Source Links */
.invest-source {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
}

.invest-source span {
  font-weight: 500;
}

.invest-source a {
  color: var(--accent);
  text-decoration: none;
  padding: 3px 10px;
  border-radius: 6px;
  background: rgba(26, 115, 232, 0.06);
  transition: background 0.2s;
}

.invest-source a:hover {
  background: rgba(26, 115, 232, 0.12);
}

@media (prefers-reduced-motion: reduce) {
  .hero-eyebrow::before,
  .gpu-row-bar::before,
  .ai-tool-category .glow-dot {
    animation: none;
  }
  .gpu-frame,
  .gpu-frame::before,
  .chat-ai-icon,
  .chat-status-dot {
    animation: none;
  }
  .gpu-row {
    transition: none;
    opacity: 1;
    transform: none;
  }
  .gpu-row-bar {
    transition: none;
  }
  #particle-canvas {
    display: none;
  }
  .bg-orb {
    transition: none;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.45);
  transition: color 0.2s;
}

.footer-links a:hover {
  color: rgba(255, 255, 255, 0.8);
}

/* ── Divider ── */
.divider {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 1px;
  background: var(--border);
}

/* ── Responsive ── */
@media (max-width: 1100px) {
  /* 平板横屏：主区 + 稍窄的侧边栏，保持 2 列 */
  .article-layout {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 28px;
  }

  .article-layout + .article-layout {
    margin-top: 72px;
  }

  .article-title {
    font-size: clamp(22px, 3.4vw, 30px);
  }
}

@media (max-width: 900px) {
  .primer-grid {
    grid-template-columns: 1fr;
  }

  .ai-tools-grid {
    grid-template-columns: 1fr;
  }

  .scenario-cards {
    grid-template-columns: 1fr;
  }

  .frontier-grid {
    grid-template-columns: 1fr;
  }

  .learning-grid {
    grid-template-columns: 1fr;
  }

  .faq-list {
    grid-template-columns: 1fr;
  }

  .summary-grid {
    grid-template-columns: 1fr;
  }

  .final-summary {
    padding: 28px;
  }

  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-layout + .article-layout {
    margin-top: 56px;
  }

  .article-sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 24px;
  }

  .article-title {
    font-size: clamp(22px, 4vw, 32px);
  }

  .article-header,
  .article-body {
    padding-left: 28px;
    padding-right: 28px;
  }

  .article-quote {
    padding: 20px 22px;
    margin: 22px 0;
  }

  .article-quote p {
    font-size: 15px;
  }

  .article-body h3 {
    font-size: 20px;
    margin: 32px 0 12px;
  }

  .article-lead {
    font-size: 16px;
  }

  .invest-card {
    padding: 24px;
  }

  .invest-metrics {
    grid-template-columns: repeat(2, 1fr);
    padding: 16px;
  }

  .invest-highlights {
    grid-template-columns: 1fr;
  }

  nav {
    display: none;
  }
}

@media (max-width: 600px) {
  .hero {
    padding: 140px 20px 80px;
  }

  section {
    padding: 0 20px;
  }

  .header-inner {
    padding: 16px 20px;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 24px 20px;
  }

  .scenario-header,
  .scenario-body {
    padding-left: 24px;
    padding-right: 24px;
  }

  .article-layout + .article-layout {
    margin-top: 40px;
  }

  .article-sidebar {
    grid-template-columns: 1fr;
  }

  .article-header {
    padding: 28px 20px 24px;
  }

  .article-body {
    padding: 28px 20px 32px;
  }

  .article-title {
    font-size: clamp(20px, 5vw, 26px);
    margin-bottom: 14px;
  }

  .article-lead {
    font-size: 15px;
    line-height: 1.65;
  }

  .article-meta span {
    font-size: 11px;
    padding: 3px 10px;
  }

  .article-body h3 {
    font-size: 18px;
    margin: 28px 0 10px;
  }

  .article-body p {
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 14px;
  }

  .article-quote {
    padding: 18px 18px;
    margin: 20px 0;
  }

  .article-quote p {
    font-size: 14px;
    line-height: 1.55;
  }

  .article-quote cite {
    font-size: 12px;
    margin-top: 8px;
  }

  .insight-panel {
    padding: 20px;
  }

  .insight-list li {
    font-size: 13px;
  }

  .btn-video {
    font-size: 13px;
    padding: 10px 16px;
  }
}

/* ── Tech Feed ── */
.tech-feed {
  padding-bottom: var(--section-gap);
}
.tf-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: -24px 0 24px;
  font-size: 13px;
  color: var(--text-muted);
}
.tf-status { font-weight: 500; }
.tf-updated { color: var(--text-muted); }

.tf-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
@media (max-width: 720px) {
  .tf-grid { grid-template-columns: 1fr; }
}

.tf-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 22px 18px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  color: inherit;
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.tf-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(26, 115, 232, 0.08);
}
.tf-card-title {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.tf-card-summary {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}
.tf-card-meta {
  font-size: 12px;
  color: var(--text-muted);
  padding-top: 8px;
  border-top: 1px dashed var(--border);
  margin-top: 4px;
}

/* skeleton */
.tf-skeleton { pointer-events: none; }
.tf-sk-line {
  height: 12px;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--bg-subtle) 25%, var(--border) 37%, var(--bg-subtle) 63%);
  background-size: 400% 100%;
  animation: tf-shimmer 1.4s ease-in-out infinite;
}
.tf-sk-line + .tf-sk-line { margin-top: 12px; }
.tf-sk-line.w-60 { width: 60%; }
.tf-sk-line.w-70 { width: 70%; }
.tf-sk-line.w-80 { width: 80%; }
.tf-sk-line.w-90 { width: 90%; }
@keyframes tf-shimmer {
  0%   { background-position: 100% 50%; }
  100% { background-position: 0 50%; }
}

.tf-error {
  margin-top: 24px;
  padding: 20px;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: 12px;
  color: var(--text-secondary);
}
.tf-retry {
  margin-top: 12px;
  padding: 8px 20px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
  transition: border-color 0.2s, color 0.2s;
}
.tf-retry:hover { border-color: var(--accent); color: var(--accent); }

/* 小屏手机：进一步压缩内边距和字号，避免文字拥挤 */
@media (max-width: 480px) {
  section {
    padding: 0 16px;
  }

  .article-layout + .article-layout {
    margin-top: 32px;
  }

  .article-card {
    border-radius: 16px;
  }

  .article-meta {
    gap: 6px;
    margin-bottom: 14px;
  }

  .article-meta span {
    font-size: 10px;
    padding: 2px 8px;
  }

  .article-header {
    padding: 22px 16px 16px;
  }

  .article-body {
    padding: 22px 16px 24px;
  }

  .article-title {
    font-size: clamp(18px, 5.2vw, 22px);
    margin-bottom: 12px;
  }

  .article-lead {
    font-size: 14px;
    line-height: 1.6;
  }

  .article-body p {
    font-size: 14px;
    line-height: 1.7;
  }

  .article-body h3 {
    font-size: 16px;
    margin: 22px 0 8px;
  }

  .article-quote {
    padding: 14px 14px;
    margin: 18px 0;
  }

  .article-quote p {
    font-size: 13px;
    line-height: 1.55;
  }

  .insight-panel {
    padding: 16px;
  }

  .insight-panel h4 {
    font-size: 12px;
    margin-bottom: 12px;
  }

  .insight-panel-desc {
    font-size: 13px;
  }

  .insight-list li {
    font-size: 12.5px;
  }

  .btn-video {
    font-size: 12.5px;
    padding: 10px 14px;
  }
}
.invest-analysis strong {
  color: var(--text);
}

/* Highlights Grid (WWDC) */
.invest-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 28px;
}

.highlight-item {
  padding: 20px;
  background: rgba(26, 115, 232, 0.02);
  border: 1px solid rgba(26, 115, 232, 0.06);
  border-radius: 14px;
  transition: border-color 0.3s;
}

.highlight-item:hover {
  border-color: rgba(26, 115, 232, 0.15);
}

.highlight-item h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.highlight-item p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Takeaway */
.invest-takeaway {
  padding: 20px 24px;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.04), rgba(239, 68, 68, 0.03));
  border: 1px solid rgba(245, 158, 11, 0.15);
  border-radius: 14px;
  margin-bottom: 24px;
}

.invest-takeaway h4 {
  font-size: 15px;
  font-weight: 600;
  color: #d97706;
  margin-bottom: 8px;
}

.invest-takeaway p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.invest-takeaway strong {
  color: var(--text);
}

/* Source Links */
.invest-source {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
}

.invest-source span {
  font-weight: 500;
}

.invest-source a {
  color: var(--accent);
  text-decoration: none;
  padding: 3px 10px;
  border-radius: 6px;
  background: rgba(26, 115, 232, 0.06);
  transition: background 0.2s;
}

.invest-source a:hover {
  background: rgba(26, 115, 232, 0.12);
}

@media (prefers-reduced-motion: reduce) {
  .hero-eyebrow::before,
  .chat-typing span,
  .ai-tool-category .glow-dot {
    animation: none;
  }
  .chat-frame,
  .chat-msg,
  .chat-msg.ai.typing-active::after,
  .chat-frame::before,
  .chat-ai-icon,
  .chat-status-dot {
    animation: none;
  }
  #particle-canvas {
    display: none;
  }
  .bg-orb {
    transition: none;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.45);
  transition: color 0.2s;
}

.footer-links a:hover {
  color: rgba(255, 255, 255, 0.8);
}

/* ── Divider ── */
.divider {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 1px;
  background: var(--border);
}

/* ── Responsive ── */
@media (max-width: 1100px) {
  /* 平板横屏：主区 + 稍窄的侧边栏，保持 2 列 */
  .article-layout {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 28px;
  }

  .article-layout + .article-layout {
    margin-top: 72px;
  }

  .article-title {
    font-size: clamp(22px, 3.4vw, 30px);
  }
}

@media (max-width: 900px) {
  .primer-grid {
    grid-template-columns: 1fr;
  }

  .ai-tools-grid {
    grid-template-columns: 1fr;
  }

  .scenario-cards {
    grid-template-columns: 1fr;
  }

  .frontier-grid {
    grid-template-columns: 1fr;
  }

  .learning-grid {
    grid-template-columns: 1fr;
  }

  .faq-list {
    grid-template-columns: 1fr;
  }

  .summary-grid {
    grid-template-columns: 1fr;
  }

  .final-summary {
    padding: 28px;
  }

  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-layout + .article-layout {
    margin-top: 56px;
  }

  .article-sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 24px;
  }

  .article-title {
    font-size: clamp(22px, 4vw, 32px);
  }

  .article-header,
  .article-body {
    padding-left: 28px;
    padding-right: 28px;
  }

  .article-quote {
    padding: 20px 22px;
    margin: 22px 0;
  }

  .article-quote p {
    font-size: 15px;
  }

  .article-body h3 {
    font-size: 20px;
    margin: 32px 0 12px;
  }

  .article-lead {
    font-size: 16px;
  }

  .invest-card {
    padding: 24px;
  }

  .invest-metrics {
    grid-template-columns: repeat(2, 1fr);
    padding: 16px;
  }

  .invest-highlights {
    grid-template-columns: 1fr;
  }

  nav {
    display: none;
  }
}

@media (max-width: 600px) {
  .hero {
    padding: 140px 20px 80px;
  }

  section {
    padding: 0 20px;
  }

  .header-inner {
    padding: 16px 20px;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 24px 20px;
  }

  .scenario-header,
  .scenario-body {
    padding-left: 24px;
    padding-right: 24px;
  }

  .article-layout + .article-layout {
    margin-top: 40px;
  }

  .article-sidebar {
    grid-template-columns: 1fr;
  }

  .article-header {
    padding: 28px 20px 24px;
  }

  .article-body {
    padding: 28px 20px 32px;
  }

  .article-title {
    font-size: clamp(20px, 5vw, 26px);
    margin-bottom: 14px;
  }

  .article-lead {
    font-size: 15px;
    line-height: 1.65;
  }

  .article-meta span {
    font-size: 11px;
    padding: 3px 10px;
  }

  .article-body h3 {
    font-size: 18px;
    margin: 28px 0 10px;
  }

  .article-body p {
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 14px;
  }

  .article-quote {
    padding: 18px 18px;
    margin: 20px 0;
  }

  .article-quote p {
    font-size: 14px;
    line-height: 1.55;
  }

  .article-quote cite {
    font-size: 12px;
    margin-top: 8px;
  }

  .insight-panel {
    padding: 20px;
  }

  .insight-list li {
    font-size: 13px;
  }

  .btn-video {
    font-size: 13px;
    padding: 10px 16px;
  }
}