/* 题库专题落地页 — 图层叠加 / 动效 / 多媒体展示 */
.tiku-landing-page .page-body {
  padding-top: 0;
  padding-bottom: 0;
}

/* ---- 通用动效 ---- */
.tiku-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.tiku-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes tiku-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes tiku-pulse-ring {
  0% { transform: scale(0.92); opacity: 0.7; }
  70% { transform: scale(1.08); opacity: 0; }
  100% { transform: scale(1.08); opacity: 0; }
}

@keyframes tiku-marquee-left {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

@keyframes tiku-marquee-right {
  0% { transform: translateX(-50%); }
  100% { transform: translateX(0); }
}

@keyframes tiku-progress-flow {
  0% { width: 18%; }
  50% { width: 72%; }
  100% { width: 18%; }
}

@keyframes tiku-orb-drift {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(12px, -16px); }
}

@keyframes tiku-glow-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes tiku-particle-rise {
  0% { transform: translateY(0) scale(1); opacity: 0; }
  10% { opacity: 0.8; }
  90% { opacity: 0.5; }
  100% { transform: translateY(-120px) scale(0.4); opacity: 0; }
}

/* ---- Hero ---- */
.tiku-hero {
  position: relative;
  background: linear-gradient(135deg, #0f1a2e 0%, #1a2f55 45%, #1e3d6e 100%);
  color: #fff;
  padding: 56px 0 72px;
  overflow: hidden;
}

.tiku-hero-decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.tiku-hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 60% 40%, black 20%, transparent 75%);
}

.tiku-hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.45;
  animation: tiku-orb-drift 8s ease-in-out infinite;
}

.tiku-hero-orb-1 {
  width: 320px;
  height: 320px;
  top: -80px;
  right: 10%;
  background: rgba(255, 153, 0, 0.35);
}

.tiku-hero-orb-2 {
  width: 240px;
  height: 240px;
  bottom: -40px;
  left: 5%;
  background: rgba(64, 140, 255, 0.3);
  animation-delay: -3s;
}

.tiku-hero-orb-3 {
  width: 180px;
  height: 180px;
  top: 40%;
  left: 40%;
  background: rgba(120, 80, 255, 0.25);
  animation-delay: -5s;
}

.tiku-hero-particles {
  position: absolute;
  inset: 0;
}

.tiku-particle {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(255, 200, 120, 0.9);
  animation: tiku-particle-rise 6s linear infinite;
}

.tiku-particle-1 { left: 8%; bottom: 10%; animation-delay: 0s; }
.tiku-particle-2 { left: 15%; bottom: 20%; animation-delay: 0.8s; }
.tiku-particle-3 { left: 22%; bottom: 5%; animation-delay: 1.6s; }
.tiku-particle-4 { left: 35%; bottom: 15%; animation-delay: 2.2s; }
.tiku-particle-5 { left: 48%; bottom: 8%; animation-delay: 0.4s; }
.tiku-particle-6 { left: 58%; bottom: 22%; animation-delay: 1.2s; }
.tiku-particle-7 { left: 68%; bottom: 12%; animation-delay: 2.8s; }
.tiku-particle-8 { left: 78%; bottom: 18%; animation-delay: 1.9s; }
.tiku-particle-9 { left: 88%; bottom: 6%; animation-delay: 3.1s; }
.tiku-particle-10 { left: 92%; bottom: 25%; animation-delay: 0.6s; }
.tiku-particle-11 { left: 42%; bottom: 28%; animation-delay: 2.4s; }
.tiku-particle-12 { left: 72%; bottom: 32%; animation-delay: 3.5s; }

.tiku-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 40px;
  align-items: center;
}

.tiku-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  padding: 4px 14px 4px 10px;
  border-radius: 999px;
  background: rgba(255, 153, 0, 0.15);
  border: 1px solid rgba(255, 153, 0, 0.4);
  color: #ffbf66;
  font-size: 13px;
  font-weight: 600;
}

.tiku-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ff9900;
  box-shadow: 0 0 0 0 rgba(255, 153, 0, 0.6);
  animation: tiku-pulse-ring 2s ease-out infinite;
}

.tiku-hero-title {
  margin: 0 0 16px;
  font-size: 42px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.tiku-hero-desc {
  margin: 0 0 28px;
  max-width: 520px;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.82);
}

.tiku-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-bottom: 32px;
}

.tiku-hero-stat strong {
  display: block;
  font-size: 30px;
  font-weight: 700;
  line-height: 1.2;
  color: #fff;
}

.tiku-hero-stat span {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.65);
}

.tiku-hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 168px;
  height: 48px;
  padding: 0 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, #ff9900 0%, #ff7a00 100%);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(255, 153, 0, 0.35);
  transition: transform 0.2s, box-shadow 0.2s;
}

.tiku-hero-cta svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tiku-hero-cta:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(255, 153, 0, 0.45);
}

.tiku-hero-visual {
  display: flex;
  justify-content: center;
}

.tiku-hero-stage {
  position: relative;
  width: 100%;
  max-width: 380px;
  min-height: 420px;
}

.tiku-hero-glow-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 320px;
  height: 320px;
  margin: -160px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, rgba(255, 153, 0, 0.5), rgba(64, 140, 255, 0.4), rgba(255, 153, 0, 0.5));
  opacity: 0.35;
  filter: blur(24px);
  animation: tiku-glow-spin 12s linear infinite;
}

.tiku-phone-mock {
  position: relative;
  z-index: 2;
  width: 280px;
  margin: 0 auto;
  border-radius: 28px;
  padding: 12px;
  background: linear-gradient(160deg, #2a2a2e 0%, #111 100%);
  box-shadow: 0 28px 56px rgba(0, 0, 0, 0.45);
  transition: transform 0.15s ease-out;
  will-change: transform;
}

.tiku-phone-float {
  animation: tiku-float 5s ease-in-out infinite;
}

.tiku-phone-screen {
  border-radius: 20px;
  background: #f5f7fb;
  overflow: hidden;
}

.tiku-phone-header {
  padding: 14px 16px 10px;
  background: linear-gradient(180deg, #1f3d6b 0%, #2a5298 100%);
  color: #fff;
}

.tiku-phone-header h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
}

.tiku-phone-header p {
  margin: 4px 0 0;
  font-size: 11px;
  opacity: 0.85;
}

.tiku-phone-tabs {
  display: flex;
  gap: 6px;
  padding: 10px 12px;
  background: #fff;
  border-bottom: 1px solid #e8ecf2;
}

.tiku-phone-tab {
  flex: 1;
  padding: 6px 4px;
  border-radius: 6px;
  background: #f0f3f8;
  color: #666;
  font-size: 11px;
  text-align: center;
}

.tiku-phone-tab.active {
  background: rgba(255, 153, 0, 0.15);
  color: var(--color-primary-dark);
  font-weight: 600;
}

.tiku-phone-cards {
  padding: 12px;
  display: grid;
  gap: 8px;
}

.tiku-phone-card {
  padding: 10px 12px;
  border-radius: 8px;
  background: #fff;
  border: 1px solid #e8ecf2;
}

.tiku-phone-card strong {
  display: block;
  font-size: 12px;
  color: #333;
  margin-bottom: 4px;
}

.tiku-phone-card span {
  font-size: 11px;
  color: #888;
}

.tiku-phone-progress {
  height: 4px;
  background: #e8ecf2;
}

.tiku-phone-progress-bar {
  display: block;
  height: 100%;
  width: 65%;
  background: linear-gradient(90deg, #ff9900, #ffb84d);
  animation: tiku-progress-flow 4s ease-in-out infinite;
}

.tiku-float-card {
  position: absolute;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
  transition: transform 0.15s ease-out;
  will-change: transform;
}

.tiku-float-card img {
  border-radius: 50%;
  object-fit: cover;
}

.tiku-float-card strong {
  display: block;
  font-size: 13px;
  color: #1a2a4a;
}

.tiku-float-card span {
  font-size: 11px;
  color: #888;
}

.tiku-float-rank {
  top: 8%;
  left: -8%;
  animation: tiku-float 4.5s ease-in-out infinite;
}

.tiku-float-streak {
  top: 42%;
  right: -12%;
  animation: tiku-float 5.2s ease-in-out infinite;
  animation-delay: -1s;
}

.tiku-float-score {
  bottom: 12%;
  left: -6%;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 12px 16px;
  background: linear-gradient(135deg, #ff9900, #ff7a00);
  color: #fff;
  animation: tiku-float 4.8s ease-in-out infinite;
  animation-delay: -2s;
}

.tiku-score-num {
  font-size: 22px;
  font-weight: 700;
}

.tiku-float-icon {
  font-size: 20px;
}

.tiku-orbit-card {
  position: absolute;
  z-index: 1;
  width: 72px;
  height: 72px;
  border-radius: 14px;
  overflow: hidden;
  border: 2px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s ease-out;
}

.tiku-orbit-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tiku-orbit-card-1 {
  top: 18%;
  right: 0;
  animation: tiku-float 6s ease-in-out infinite;
}

.tiku-orbit-card-2 {
  bottom: 20%;
  right: -4%;
  animation: tiku-float 5.5s ease-in-out infinite;
  animation-delay: -2.5s;
}

/* ---- Showcase 图层叠加 ---- */
.tiku-showcase {
  padding: 72px 0;
  background: #fff;
}

.tiku-showcase-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 48px;
  align-items: center;
}

.tiku-demo-stage {
  position: relative;
  min-height: 420px;
  border-radius: 20px;
  overflow: hidden;
}

.tiku-demo-layer {
  position: absolute;
}

.tiku-demo-bg {
  inset: 0;
}

.tiku-demo-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.05);
}

.tiku-demo-bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15, 26, 46, 0.75) 0%, rgba(30, 61, 110, 0.55) 100%);
}

.tiku-demo-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
  font-size: 13px;
  font-weight: 600;
  color: #333;
}

.tiku-demo-card img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  object-fit: cover;
}

.tiku-demo-card-back {
  top: 12%;
  left: 8%;
  z-index: 1;
  animation: tiku-float 5s ease-in-out infinite;
}

.tiku-demo-card-mid {
  top: 28%;
  left: 18%;
  z-index: 2;
  animation: tiku-float 5.5s ease-in-out infinite;
  animation-delay: -1.5s;
}

.tiku-demo-phone {
  bottom: 8%;
  right: 6%;
  z-index: 4;
  width: 220px;
  border-radius: 20px;
  padding: 10px;
  background: #111;
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.35);
  animation: tiku-float 4.8s ease-in-out infinite;
  animation-delay: -0.8s;
}

.tiku-quiz-screen {
  border-radius: 14px;
  background: #f8fafc;
  padding: 14px;
}

.tiku-quiz-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.tiku-quiz-tag {
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(255, 153, 0, 0.15);
  color: var(--color-primary-dark);
  font-size: 11px;
  font-weight: 600;
}

.tiku-quiz-timer {
  font-size: 12px;
  font-weight: 700;
  color: #e65c00;
}

.tiku-quiz-subject {
  margin: 0 0 6px;
  font-size: 11px;
  color: #888;
}

.tiku-quiz-title {
  margin: 0 0 12px;
  font-size: 13px;
  line-height: 1.5;
  color: #333;
}

.tiku-quiz-options {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  display: grid;
  gap: 6px;
}

.tiku-quiz-opt {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid #e0e6ef;
  font-size: 12px;
  color: #444;
  transition: background 0.3s, border-color 0.3s, color 0.3s;
}

.tiku-quiz-opt-active {
  border-color: var(--color-primary);
  background: rgba(255, 153, 0, 0.12);
  color: var(--color-primary-dark);
  font-weight: 600;
}

.tiku-quiz-progress {
  height: 4px;
  border-radius: 2px;
  background: #e8ecf2;
  overflow: hidden;
}

.tiku-quiz-progress-bar {
  display: block;
  height: 100%;
  width: 50%;
  background: linear-gradient(90deg, #ff9900, #4a90d9);
  transition: width 0.5s ease;
}

.tiku-demo-float {
  position: absolute;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.18);
  font-size: 12px;
}

.tiku-demo-float-score {
  top: 16%;
  right: 12%;
  flex-direction: column;
  align-items: center;
  background: linear-gradient(135deg, #ff9900, #ff7a00);
  color: #fff;
  animation: tiku-float 4.5s ease-in-out infinite;
}

.tiku-demo-float-score strong {
  font-size: 20px;
}

.tiku-demo-float-rank {
  bottom: 22%;
  left: 10%;
  animation: tiku-float 5.2s ease-in-out infinite;
  animation-delay: -2s;
}

.tiku-demo-float-rank img {
  border-radius: 50%;
}

.tiku-showcase-label {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.06em;
}

.tiku-showcase-title {
  margin: 0 0 16px;
  font-size: 30px;
  font-weight: 700;
  line-height: 1.35;
  color: #1a2a4a;
}

.tiku-showcase-desc {
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 1.75;
  color: #666;
}

.tiku-showcase-points {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.tiku-showcase-points li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: #444;
}

.tiku-point-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
}

.tiku-showcase-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 28px;
  border-radius: 8px;
  background: #1a2a4a;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}

.tiku-showcase-cta:hover {
  background: #243f72;
  color: #fff;
  transform: translateY(-1px);
}

/* ---- 功能卡片 ---- */
.tiku-section {
  padding: 56px 0;
}

.tiku-section-alt {
  background: #f7f9fc;
}

.tiku-section-title {
  margin: 0 0 10px;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.35;
  color: #1a2a4a;
  text-align: center;
}

.tiku-section-sub {
  margin: 0 0 40px;
  font-size: 15px;
  color: #666;
  text-align: center;
}

.tiku-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.tiku-feature-card {
  position: relative;
  padding: 28px 24px;
  border-radius: 16px;
  background: #fff;
  border: 1px solid #e8ecf2;
  overflow: hidden;
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
}

.tiku-feature-card-bg {
  position: absolute;
  top: -40%;
  right: -20%;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  opacity: 0.35;
  filter: blur(2px);
  pointer-events: none;
  transition: transform 0.4s ease;
}

.tiku-feature-accent-0 .tiku-feature-card-bg { background: radial-gradient(circle, rgba(255, 153, 0, 0.45), transparent 70%); }
.tiku-feature-accent-1 .tiku-feature-card-bg { background: radial-gradient(circle, rgba(64, 140, 255, 0.4), transparent 70%); }
.tiku-feature-accent-2 .tiku-feature-card-bg { background: radial-gradient(circle, rgba(120, 80, 255, 0.35), transparent 70%); }
.tiku-feature-accent-3 .tiku-feature-card-bg { background: radial-gradient(circle, rgba(0, 180, 160, 0.35), transparent 70%); }
.tiku-feature-accent-4 .tiku-feature-card-bg { background: radial-gradient(circle, rgba(255, 100, 120, 0.35), transparent 70%); }
.tiku-feature-accent-5 .tiku-feature-card-bg { background: radial-gradient(circle, rgba(255, 180, 60, 0.4), transparent 70%); }

.tiku-feature-thumb-wrap {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 56px;
  height: 56px;
  border-radius: 12px;
  overflow: hidden;
  opacity: 0.55;
  transform: rotate(6deg);
  transition: opacity 0.3s, transform 0.3s;
}

.tiku-feature-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tiku-feature-card:hover {
  border-color: rgba(255, 153, 0, 0.35);
  box-shadow: 0 16px 40px rgba(21, 34, 56, 0.1);
  transform: translateY(-4px);
}

.tiku-feature-card:hover .tiku-feature-card-bg {
  transform: scale(1.15);
}

.tiku-feature-card:hover .tiku-feature-thumb-wrap {
  opacity: 0.85;
  transform: rotate(0deg) scale(1.05);
}

.tiku-feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(255, 153, 0, 0.12) 0%, rgba(31, 61, 107, 0.08) 100%);
  color: var(--color-primary-dark);
}

.tiku-feature-icon svg {
  width: 26px;
  height: 26px;
  fill: currentColor;
}

.tiku-feature-title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: #1a2a4a;
}

.tiku-feature-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: #666;
}

/* ---- 实时动态 ---- */
.tiku-activity {
  padding: 56px 0;
  background: linear-gradient(180deg, #f0f4fa 0%, #fff 100%);
}

.tiku-activity-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 40px;
  align-items: center;
}

.tiku-activity-stack {
  position: relative;
  min-height: 360px;
}

.tiku-stack-layer {
  position: absolute;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(21, 34, 56, 0.12);
}

.tiku-stack-layer img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tiku-stack-layer-3 {
  inset: 0 12% 12% 0;
  z-index: 1;
  opacity: 0.5;
  transform: rotate(-4deg);
}

.tiku-stack-layer-2 {
  inset: 8% 6% 6% 6%;
  z-index: 2;
  opacity: 0.75;
  transform: rotate(2deg);
}

.tiku-stack-layer-1 {
  inset: 16% 0 0 12%;
  z-index: 3;
  padding: 28px;
  background: linear-gradient(145deg, #1a2a4a 0%, #2a5298 100%);
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  animation: tiku-float 6s ease-in-out infinite;
}

.tiku-stack-stat strong {
  display: block;
  font-size: 36px;
  font-weight: 700;
  line-height: 1.1;
}

.tiku-stack-stat span {
  font-size: 14px;
  opacity: 0.8;
}

.tiku-stack-ring {
  position: relative;
  width: 100px;
  height: 100px;
}

.tiku-stack-ring svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.tiku-ring-bg {
  fill: none;
  stroke: rgba(255, 255, 255, 0.2);
  stroke-width: 8;
}

.tiku-ring-fill {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 264;
  stroke-dashoffset: 34;
  animation: tiku-ring-spin 3s ease-in-out infinite alternate;
}

@keyframes tiku-ring-spin {
  0% { stroke-dashoffset: 80; }
  100% { stroke-dashoffset: 20; }
}

.tiku-ring-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
}

.tiku-activity-feed {
  display: grid;
  gap: 12px;
}

.tiku-activity-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid #e8ecf2;
  transition: box-shadow 0.25s, transform 0.25s;
}

.tiku-activity-card:hover {
  box-shadow: 0 8px 24px rgba(21, 34, 56, 0.08);
  transform: translateX(4px);
}

.tiku-activity-avatar {
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.tiku-activity-text {
  margin: 0 0 4px;
  font-size: 14px;
  color: #444;
}

.tiku-activity-text strong {
  color: #1a2a4a;
}

.tiku-activity-time {
  font-size: 12px;
  color: #999;
}

.tiku-activity-pulse {
  position: absolute;
  top: 14px;
  right: 16px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
}

.tiku-activity-pulse::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid rgba(34, 197, 94, 0.5);
  animation: tiku-pulse-ring 2s ease-out infinite;
}

/* ---- 科目 Marquee + 拼贴 ---- */
.tiku-marquee-wrap {
  margin-bottom: 32px;
  overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, black 8%, black 92%, transparent);
}

.tiku-marquee {
  display: flex;
  overflow: hidden;
  margin-bottom: 10px;
}

.tiku-marquee-track {
  display: flex;
  gap: 12px;
  flex-shrink: 0;
  padding-right: 12px;
}

.tiku-marquee-row-1 .tiku-marquee-track {
  animation: tiku-marquee-left 28s linear infinite;
}

.tiku-marquee-row-2 .tiku-marquee-track {
  animation: tiku-marquee-right 32s linear infinite;
}

.tiku-marquee-item {
  padding: 8px 20px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #dde3ec;
  font-size: 14px;
  color: #444;
  white-space: nowrap;
}

.tiku-subject-collage {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.tiku-collage-item {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  aspect-ratio: 1.2;
  box-shadow: 0 8px 24px rgba(21, 34, 56, 0.1);
}

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

.tiku-collage-item span {
  position: absolute;
  left: 10px;
  bottom: 10px;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
}

.tiku-collage-item:hover img {
  transform: scale(1.08);
}

.tiku-collage-item-0 { transform: rotate(-2deg); }
.tiku-collage-item-1 { transform: rotate(1.5deg); margin-top: 12px; }
.tiku-collage-item-2 { transform: rotate(-1deg); }
.tiku-collage-item-3 { transform: rotate(2deg); margin-top: 8px; }

.tiku-subject-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  max-width: 880px;
  margin: 0 auto;
}

.tiku-subject-tag {
  padding: 10px 20px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid #dde3ec;
  font-size: 14px;
  color: #444;
  transition: border-color 0.2s, color 0.2s, transform 0.2s;
}

.tiku-subject-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
  transform: translateY(-2px);
}

/* ---- 步骤 ---- */
.tiku-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.tiku-step-card {
  text-align: center;
  padding: 8px 12px;
}

.tiku-step-visual {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 0 auto 20px;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 12px 32px rgba(21, 34, 56, 0.12);
  background: #f0f4fa;
}

.tiku-step-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tiku-step-num {
  position: absolute;
  top: 8px;
  left: 8px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(255, 153, 0, 0.4);
}

.tiku-step-title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: #1a2a4a;
}

.tiku-step-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: #666;
}

/* ---- 下载区 ---- */
.tiku-download {
  position: relative;
  padding: 64px 0 72px;
  background: linear-gradient(180deg, #eef2f8 0%, #e4eaf4 100%);
  overflow: hidden;
}

.tiku-download-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.tiku-download-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: tiku-orb-drift 10s ease-in-out infinite;
}

.tiku-download-orb-1 {
  width: 400px;
  height: 400px;
  top: -100px;
  right: -80px;
  background: rgba(255, 153, 0, 0.35);
}

.tiku-download-orb-2 {
  width: 300px;
  height: 300px;
  bottom: -80px;
  left: -60px;
  background: rgba(64, 140, 255, 0.3);
  animation-delay: -4s;
}

.tiku-download-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 48px;
  align-items: center;
  max-width: 920px;
}

.tiku-download-title {
  margin: 0 0 12px;
  font-size: 26px;
  font-weight: 700;
  color: #1a2a4a;
}

.tiku-download-desc {
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 1.65;
  color: #666;
}

.tiku-store-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tiku-store-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 148px;
  height: 46px;
  padding: 0 20px;
  border-radius: 8px;
  background: #1a2a4a;
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}

.tiku-store-btn svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
  flex-shrink: 0;
}

.tiku-store-btn:hover {
  background: #243f72;
  color: #fff;
  transform: translateY(-2px);
}

.tiku-qr-card {
  position: relative;
  text-align: center;
}

.tiku-qr-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 200px;
  height: 200px;
  margin: -100px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 153, 0, 0.35), transparent 70%);
  animation: tiku-pulse-ring 3s ease-out infinite;
}

.tiku-qr-box {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 168px;
  height: 168px;
  margin: 0 auto 12px;
  padding: 12px;
  border-radius: 16px;
  background: #fff;
  border: 1px solid #dde3ec;
  box-shadow: 0 12px 32px rgba(21, 34, 56, 0.1);
}

.tiku-qr-pattern {
  width: 100%;
  height: 100%;
  border-radius: 8px;
  background:
    repeating-linear-gradient(0deg, #1a2a4a 0, #1a2a4a 4px, transparent 4px, transparent 8px),
    repeating-linear-gradient(90deg, #1a2a4a 0, #1a2a4a 4px, transparent 4px, transparent 8px);
  background-size: 8px 8px;
  position: relative;
}

.tiku-qr-logo {
  position: absolute;
  inset: 50%;
  width: 40px;
  height: 40px;
  margin: -20px;
  border-radius: 8px;
  background: #fff;
  padding: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.tiku-qr-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.tiku-qr-label {
  margin: 0 0 12px;
  font-size: 14px;
  color: #666;
}

.tiku-qr-phone-hint {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid #dde3ec;
  font-size: 13px;
  color: #555;
}

.tiku-qr-hint-img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  object-fit: cover;
}

/* ---- 响应式 ---- */
@media (max-width: 992px) {
  .tiku-hero-inner,
  .tiku-showcase-inner,
  .tiku-activity-layout {
    grid-template-columns: 1fr;
  }

  .tiku-hero-copy {
    text-align: center;
  }

  .tiku-hero-desc {
    max-width: none;
  }

  .tiku-hero-stats {
    justify-content: center;
  }

  .tiku-feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tiku-subject-collage {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tiku-download-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .tiku-store-btns {
    justify-content: center;
  }

  .tiku-float-rank { left: 0; }
  .tiku-float-streak { right: 0; }
}

@media (max-width: 576px) {
  .tiku-hero {
    padding: 40px 0 48px;
  }

  .tiku-hero-title {
    font-size: 28px;
  }

  .tiku-feature-grid,
  .tiku-steps,
  .tiku-subject-collage {
    grid-template-columns: 1fr;
  }

  .tiku-section-title,
  .tiku-showcase-title {
    font-size: 22px;
  }

  .tiku-phone-mock {
    width: 240px;
  }

  .tiku-demo-stage {
    min-height: 360px;
  }

  .tiku-demo-phone {
    width: 180px;
    right: 4%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tiku-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .tiku-hero-orb,
  .tiku-particle,
  .tiku-phone-float,
  .tiku-float-card,
  .tiku-orbit-card,
  .tiku-demo-card,
  .tiku-demo-phone,
  .tiku-demo-float,
  .tiku-stack-layer-1,
  .tiku-marquee-track,
  .tiku-phone-progress-bar,
  .tiku-hero-glow-ring,
  .tiku-ring-fill,
  .tiku-qr-glow,
  .tiku-badge-dot,
  .tiku-activity-pulse::after {
    animation: none !important;
  }
}