/* ========================================================================== 
   GPT985 Home V2
   首页专属视觉层。业务数据、链接与交互逻辑仍由现有 PHP / JS 提供。
   ========================================================================== */

:root {
  --home-navy: #0b1220;
  --home-ink: #111827;
  --home-muted: #64748b;
  --home-blue: #2563eb;
  --home-blue-dark: #1d4ed8;
  --home-violet: #7c3aed;
  --home-soft: #f3f7ff;
  --home-line: #dce5f2;
  --home-card: #ffffff;
  --home-radius-lg: 28px;
  --home-radius-md: 20px;
  --home-shadow: 0 24px 70px rgba(30, 64, 175, 0.1);
}

body {
  color: var(--home-ink);
  background: #f8fbff;
}

main {
  position: relative;
  overflow: hidden;
}

.shell {
  width: min(1180px, calc(100% - 48px));
}

.section {
  padding: 92px 0;
}

.section-head {
  max-width: 760px;
  margin-bottom: 48px;
}

.section-head-split {
  max-width: none;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.72fr);
  align-items: end;
  gap: 64px;
}

.section-num {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: auto;
  min-height: 28px;
  margin: 0 0 17px;
  padding: 5px 10px;
  color: var(--home-blue);
  border: 1px solid rgba(37, 99, 235, 0.18);
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.06);
  font-size: 0.72rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.11em;
}

.section-num-light {
  color: #bfdbfe;
  border-color: rgba(191, 219, 254, 0.25);
  background: rgba(255, 255, 255, 0.08);
}

.section-title {
  margin: 0;
  color: var(--home-ink);
  font-size: clamp(2rem, 4vw, 3.45rem);
  font-weight: 790;
  line-height: 1.08;
  letter-spacing: -0.052em;
}

.section-sub {
  margin: 18px 0 0;
  color: var(--home-muted);
  font-size: 1rem;
  line-height: 1.85;
}

.section-head-split .section-sub {
  margin: 0 0 4px;
}

/* ---------- Header ---------- */
.home-v2-topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(220, 229, 242, 0.72);
  background: rgba(248, 251, 255, 0.86);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  transition: box-shadow 180ms ease, background 180ms ease;
}

.home-v2-topbar.scrolled {
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 12px 38px rgba(15, 23, 42, 0.08);
}

.home-v2-topbar .topbar-inner {
  min-height: 76px;
}

.home-v2-topbar .brand {
  gap: 10px;
}

.home-v2-topbar .brand-mark,
.home-v2-topbar .brand-logo {
  width: 36px;
  height: 36px;
}

.home-v2-topbar .brand-name {
  color: var(--home-navy);
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: -0.035em;
}

.home-v2-topbar .brand-name em {
  color: var(--home-blue);
  font-style: normal;
}

.brand-role {
  margin-left: 2px;
  padding-left: 12px;
  color: #94a3b8;
  border-left: 1px solid var(--home-line);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.home-v2-topbar .nav {
  gap: 3px;
}

.home-v2-topbar .nav > a:not(.btn) {
  padding: 9px 11px;
  color: #475569;
  border-radius: 10px;
  font-size: 0.86rem;
  font-weight: 600;
}

.home-v2-topbar .nav > a:not(.btn):hover,
.home-v2-topbar .nav > a:not(.btn).is-active {
  color: var(--home-blue);
  background: #edf4ff;
}

.home-v2-topbar .nav-cta {
  min-height: 42px;
  margin-left: 12px;
  padding-inline: 17px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(37, 99, 235, 0.22);
}

.home-v2-topbar .nav-cta svg {
  width: 15px;
  height: 15px;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 104px 0 118px;
  isolation: isolate;
}

.hero::before {
  position: absolute;
  z-index: -2;
  inset: 0;
  content: "";
  background:
    radial-gradient(circle at 82% 35%, rgba(124, 58, 237, 0.12), transparent 28%),
    radial-gradient(circle at 68% 5%, rgba(37, 99, 235, 0.16), transparent 29%),
    linear-gradient(180deg, #f8fbff 0%, #f4f8ff 74%, #ffffff 100%);
}

.hero::after {
  position: absolute;
  z-index: -1;
  top: 46px;
  right: max(-160px, calc((100vw - 1180px) / 2 - 200px));
  width: 630px;
  height: 630px;
  content: "";
  border: 1px solid rgba(37, 99, 235, 0.08);
  border-radius: 50%;
  background-image: radial-gradient(rgba(37, 99, 235, 0.15) 1px, transparent 1px);
  background-size: 20px 20px;
  mask-image: radial-gradient(circle, #000 5%, transparent 68%);
  opacity: 0.66;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(410px, 0.82fr);
  align-items: center;
  gap: 86px;
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 34px;
  margin-bottom: 28px;
  padding: 5px 13px 5px 6px;
  color: #475569;
  border: 1px solid var(--home-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
  font-size: 0.76rem;
  font-weight: 700;
}

.eyebrow-icon {
  display: grid;
  width: 24px;
  height: 24px;
  place-items: center;
  color: #fff;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--home-blue), var(--home-violet));
  font-size: 0.7rem;
  font-weight: 800;
}

.eyebrow i {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #94a3b8;
}

.hero-title {
  max-width: 720px;
  margin: 0;
  color: var(--home-navy);
  font-size: clamp(3.05rem, 5.4vw, 5rem);
  font-weight: 820;
  line-height: 1.025;
  letter-spacing: -0.068em;
}

.hero-title-em {
  color: transparent;
  background: linear-gradient(100deg, var(--home-blue) 0%, #4f46e5 48%, var(--home-violet) 100%);
  background-clip: text;
  -webkit-background-clip: text;
}

.hero-lead {
  max-width: 650px;
  margin: 28px 0 0;
  color: #526176;
  font-size: 1.08rem;
  line-height: 1.9;
}

.hero-capabilities {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 23px;
}

.hero-capabilities span {
  padding: 7px 10px;
  color: #526176;
  border: 1px solid rgba(37, 99, 235, 0.13);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  font-size: 0.7rem;
  font-weight: 700;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.hero-actions .btn {
  min-height: 52px;
  padding: 13px 22px;
  border-radius: 14px;
}

.hero-actions .hero-primary {
  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.24);
}

.hero-actions svg {
  width: 17px;
  height: 17px;
}

.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  margin-top: 28px;
  color: #64748b;
  font-size: 0.82rem;
  font-weight: 650;
}

.hero-trust span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-trust svg {
  width: 15px;
  height: 15px;
  color: #16a34a;
}

.hero-service-meta {
  display: flex;
  margin-top: 28px;
  align-items: center;
  gap: 22px;
}

.hero-service-meta > div {
  display: grid;
  gap: 4px;
}

.hero-service-meta strong {
  color: var(--home-navy);
  font-size: 1rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
}

.hero-service-meta span {
  color: #94a3b8;
  font-size: 0.63rem;
}

.hero-service-meta > i {
  width: 1px;
  height: 28px;
  background: var(--home-line);
}

.hero-aside {
  position: relative;
  z-index: 1;
  min-height: 520px;
  perspective: 1100px;
}

.ai-visual-stage {
  position: relative;
  width: 100%;
  height: 520px;
  overflow: hidden;
  border: 1px solid rgba(37, 99, 235, 0.11);
  border-radius: 36px;
  background:
    radial-gradient(circle at 50% 44%, rgba(78, 97, 255, 0.2), transparent 25%),
    radial-gradient(circle at 75% 18%, rgba(124, 58, 237, 0.18), transparent 28%),
    linear-gradient(145deg, rgba(255, 255, 255, 0.8), rgba(237, 244, 255, 0.64));
  box-shadow: 0 38px 100px rgba(37, 99, 235, 0.15), inset 0 0 0 1px rgba(255, 255, 255, 0.85);
  transform-style: preserve-3d;
  backdrop-filter: blur(16px);
}

.ai-grid-plane {
  position: absolute;
  right: -18%;
  bottom: -36%;
  left: -18%;
  height: 72%;
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.13) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(to bottom, transparent, #000 35%, transparent 90%);
  transform: rotateX(66deg) translateZ(-40px);
  transform-origin: center top;
}

.ai-halo {
  position: absolute;
  top: 47%;
  left: 50%;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.ai-halo-one {
  width: 340px;
  height: 340px;
  border: 1px solid rgba(37, 99, 235, 0.12);
  box-shadow: inset 0 0 60px rgba(37, 99, 235, 0.08), 0 0 80px rgba(79, 70, 229, 0.09);
}

.ai-halo-two {
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.12), transparent 67%);
  filter: blur(2px);
}

.ai-ring {
  position: absolute;
  top: 46%;
  left: 50%;
  width: 310px;
  height: 310px;
  border: 1px solid rgba(79, 70, 229, 0.34);
  border-radius: 50%;
  transform-style: preserve-3d;
}

.ai-ring::before,
.ai-ring::after {
  position: absolute;
  width: 9px;
  height: 9px;
  content: "";
  border: 2px solid #fff;
  border-radius: 50%;
  background: #4f46e5;
  box-shadow: 0 0 18px #6366f1;
}

.ai-ring::before { top: 17%; left: 6%; }
.ai-ring::after { right: 8%; bottom: 18%; }

.ai-ring-one {
  transform: translate(-50%, -50%) rotateX(68deg) rotateZ(12deg);
  animation: aiRingOne 14s linear infinite;
}

.ai-ring-two {
  width: 255px;
  height: 255px;
  border-color: rgba(37, 99, 235, 0.35);
  transform: translate(-50%, -50%) rotateY(68deg) rotateZ(-18deg);
  animation: aiRingTwo 11s linear infinite reverse;
}

.ai-ring-three {
  width: 205px;
  height: 205px;
  border-style: dashed;
  border-color: rgba(124, 58, 237, 0.35);
  transform: translate(-50%, -50%) rotateX(62deg) rotateY(30deg);
  animation: aiRingThree 18s linear infinite;
}

.ai-core-glow {
  position: absolute;
  top: 46%;
  left: 50%;
  width: 155px;
  height: 155px;
  border-radius: 50%;
  background: rgba(79, 70, 229, 0.28);
  filter: blur(34px);
  transform: translate(-50%, -50%);
  animation: aiPulse 3.2s ease-in-out infinite;
}

.ai-core {
  position: absolute;
  top: 46%;
  left: 50%;
  display: grid;
  width: 124px;
  height: 124px;
  place-items: center;
  overflow: hidden;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 38%;
  background:
    radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.42), transparent 25%),
    linear-gradient(145deg, #172554, #2563eb 54%, #7c3aed);
  box-shadow: inset -14px -18px 30px rgba(15, 23, 42, 0.28), 0 26px 65px rgba(37, 99, 235, 0.42);
  transform: translate(-50%, -50%) rotate(-8deg);
  animation: aiCoreFloat 5s ease-in-out infinite;
}

.ai-core svg {
  position: relative;
  z-index: 2;
  width: 62px;
  height: 62px;
  filter: drop-shadow(0 6px 12px rgba(15, 23, 42, 0.28));
}

.ai-core-shine {
  position: absolute;
  inset: -70% 45% 30% -55%;
  background: linear-gradient(110deg, transparent, rgba(255, 255, 255, 0.45), transparent);
  transform: rotate(16deg);
}

.ai-node {
  position: absolute;
  padding: 7px 10px;
  color: #4f5f75;
  border: 1px solid rgba(148, 163, 184, 0.24);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 0 10px 30px rgba(37, 99, 235, 0.08);
  font-size: 0.58rem;
  font-weight: 850;
  letter-spacing: 0.13em;
  backdrop-filter: blur(10px);
  animation: aiNodeFloat 4.5s ease-in-out infinite;
}

.ai-node-files { top: 22%; left: 10%; }
.ai-node-code { top: 16%; right: 12%; animation-delay: -1.2s; }
.ai-node-image { right: 8%; bottom: 25%; animation-delay: -2.3s; }
.ai-node-voice { bottom: 28%; left: 9%; animation-delay: -3.1s; }

.ai-visual-caption {
  position: absolute;
  right: 24px;
  bottom: 22px;
  left: 24px;
  display: grid;
  grid-template-columns: 1fr auto;
  padding: 16px 18px;
  align-items: end;
  color: var(--home-navy);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 16px 44px rgba(30, 64, 175, 0.1);
  backdrop-filter: blur(14px);
}

.ai-visual-caption > span {
  grid-column: 1 / -1;
  margin-bottom: 5px;
  color: #64748b;
  font-size: 0.54rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.ai-visual-caption > span i {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 6px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.12);
}

.ai-visual-caption strong {
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.ai-visual-caption small {
  color: #94a3b8;
  font-size: 0.61rem;
}

@keyframes aiRingOne {
  to { transform: translate(-50%, -50%) rotateX(68deg) rotateZ(372deg); }
}

@keyframes aiRingTwo {
  to { transform: translate(-50%, -50%) rotateY(68deg) rotateZ(342deg); }
}

@keyframes aiRingThree {
  to { transform: translate(-50%, -50%) rotateX(62deg) rotateY(390deg); }
}

@keyframes aiCoreFloat {
  0%, 100% { transform: translate(-50%, -50%) rotate(-8deg) translateY(0); }
  50% { transform: translate(-50%, -50%) rotate(-3deg) translateY(-10px); }
}

@keyframes aiPulse {
  0%, 100% { opacity: 0.62; transform: translate(-50%, -50%) scale(0.92); }
  50% { opacity: 1; transform: translate(-50%, -50%) scale(1.08); }
}

@keyframes aiNodeFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-7px); }
}

/* ---------- Plans ---------- */
.section-pro-plans {
  position: relative;
  background: linear-gradient(180deg, var(--home-navy) 0, #11244b 420px, #f5f8fe 420px, #fff 100%);
}

.section-pro-plans .plans-section-head .section-num {
  color: #bfdbfe;
  border-color: rgba(191, 219, 254, 0.22);
  background: rgba(255, 255, 255, 0.07);
}

.section-pro-plans .plans-section-head .section-title {
  color: #fff;
}

.section-pro-plans .plans-section-head .section-sub {
  color: #b7c5da;
}

.plan-notice {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
  padding: 15px 18px;
  color: #475569;
  border: 1px solid #dbeafe;
  border-radius: 15px;
  background: #f6f9ff;
  font-size: 0.8rem;
}

.plan-notice-icon {
  display: grid;
  width: 24px;
  height: 24px;
  place-items: center;
  color: #fff;
  border-radius: 50%;
  background: var(--home-blue);
  font-family: Georgia, serif;
  font-weight: 700;
}

.plan-notice p {
  margin: 0;
  line-height: 1.6;
}

.plan-notice strong {
  margin-right: 7px;
  color: var(--home-navy);
}

.plan-notice a {
  color: var(--home-blue);
  font-weight: 750;
  white-space: nowrap;
}

.pro-plan-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.pro-plan-row {
  position: relative;
  display: flex;
  min-height: 100%;
  padding: 24px;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--home-line);
  border-radius: var(--home-radius-md);
  background: var(--home-card);
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.035);
  transition: transform 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.pro-plan-row::before {
  position: absolute;
  top: 0;
  right: 24px;
  left: 24px;
  height: 2px;
  content: "";
  background: transparent;
}

.pro-plan-row:hover {
  border-color: #bfd1eb;
  box-shadow: 0 22px 55px rgba(37, 99, 235, 0.1);
  transform: translateY(-5px);
}

.pro-plan-row.is-recommended {
  border-color: rgba(37, 99, 235, 0.42);
  background: linear-gradient(180deg, #f8fbff 0%, #fff 35%);
}

.pro-plan-row.is-recommended::before {
  background: linear-gradient(90deg, var(--home-blue), var(--home-violet));
}

.pro-plan-row-head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 11px;
}

.pro-plan-logo {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  color: #fff;
  border-radius: 13px;
  background: var(--home-navy);
}

.pro-plan-logo svg {
  width: 22px;
  height: 22px;
}

.pro-plan-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.pro-plan-meta span,
.plan-recommend {
  display: inline-flex;
  padding: 4px 7px;
  color: #64748b;
  border-radius: 6px;
  background: #f1f5f9;
  font-size: 0.63rem;
  font-weight: 750;
  white-space: nowrap;
}

.plan-recommend {
  color: #fff;
  background: var(--home-blue);
}

.pro-plan-copy {
  margin-top: 22px;
}

.pro-plan-copy h3 {
  margin: 0;
  color: var(--home-navy);
  font-size: 1.18rem;
  font-weight: 790;
  line-height: 1.3;
  letter-spacing: -0.025em;
}

.pro-plan-copy p {
  min-height: 45px;
  margin: 8px 0 0;
  color: #7c8a9f;
  font-size: 0.78rem;
  line-height: 1.6;
}

.pro-plan-row-price {
  display: flex;
  align-items: baseline;
  margin: 22px 0 20px;
  color: var(--home-navy);
}

.pro-plan-row-price span {
  margin-right: 3px;
  font-size: 1rem;
  font-weight: 750;
}

.pro-plan-row-price strong {
  font-size: 2.7rem;
  font-weight: 820;
  line-height: 1;
  letter-spacing: -0.065em;
}

.pro-plan-row-price em {
  margin-left: 5px;
  color: #94a3b8;
  font-size: 0.73rem;
  font-style: normal;
}

.pro-plan-tags {
  display: grid;
  gap: 10px;
  margin: 0 0 24px;
  padding: 18px 0 0;
  border-top: 1px solid #edf1f6;
  list-style: none;
}

.pro-plan-tags li {
  position: relative;
  padding-left: 21px;
  color: #526176;
  font-size: 0.76rem;
  line-height: 1.5;
}

.pro-plan-tags li::before {
  position: absolute;
  top: 0.18em;
  left: 0;
  display: grid;
  width: 14px;
  height: 14px;
  content: "✓";
  place-items: center;
  color: var(--home-blue);
  border-radius: 50%;
  background: #eaf2ff;
  font-size: 0.57rem;
  font-weight: 900;
}

.pro-plan-buy {
  display: flex;
  min-height: 44px;
  margin-top: auto;
  padding: 11px 14px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--home-navy);
  border: 1px solid var(--home-line);
  border-radius: 11px;
  background: #fff;
  font-size: 0.78rem;
  font-weight: 750;
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease;
}

.pro-plan-buy svg {
  width: 15px;
  height: 15px;
}

.pro-plan-buy:hover,
.is-recommended .pro-plan-buy {
  color: #fff;
  border-color: var(--home-blue);
  background: var(--home-blue);
}

.is-recommended .pro-plan-buy:hover {
  background: var(--home-blue-dark);
}

.plans-foot-actions {
  display: flex;
  margin-top: 26px;
  padding: 22px 24px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-radius: 17px;
  background: var(--home-navy);
}

.plans-foot-actions p {
  margin: 0;
  color: #cbd5e1;
  font-size: 0.82rem;
  line-height: 1.6;
}

.plans-foot-actions .btn {
  flex: 0 0 auto;
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.1);
}

/* ---------- More AI ---------- */
.section-ai-services {
  padding: 72px 0;
  border-top: 1px solid var(--home-line);
  border-bottom: 1px solid var(--home-line);
  background: #f8fafc;
}

.section-ai-services .section-head {
  margin-bottom: 30px;
}

.section-ai-services .section-title {
  font-size: clamp(1.75rem, 3vw, 2.55rem);
}

.ai-service-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.ai-service-card {
  position: relative;
  display: grid;
  min-height: 190px;
  padding: 21px;
  grid-template-columns: auto 1fr;
  grid-template-rows: 1fr auto;
  gap: 0 16px;
  overflow: hidden;
  color: var(--home-ink);
  border: 1px solid var(--home-line);
  border-radius: 17px;
  background: #fff;
  transition: transform 220ms ease, box-shadow 220ms ease, border-color 220ms ease;
}

.ai-service-card::after {
  position: absolute;
  top: -95px;
  right: -95px;
  width: 180px;
  height: 180px;
  content: "";
  border-radius: 50%;
  opacity: 0.12;
}

.ai-service-claude::after { background: #d97706; }
.ai-service-gemini::after { background: #2563eb; }
.ai-service-grok::after { background: #0f172a; }

.ai-service-card:hover {
  border-color: #bdcce2;
  box-shadow: var(--home-shadow);
  transform: translateY(-6px);
}

.ai-service-index {
  position: absolute;
  top: 20px;
  right: 20px;
  color: #cbd5e1;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.ai-service-icon {
  display: grid;
  width: 43px;
  height: 43px;
  place-items: center;
  color: var(--home-navy);
  border: 1px solid var(--home-line);
  border-radius: 13px;
  background: #f8fafc;
  font-size: 1.1rem;
  font-weight: 850;
}

.ai-service-copy {
  align-self: center;
  margin: 0;
}

.ai-service-type {
  color: #7c8a9f;
  font-size: 0.67rem;
  font-weight: 750;
  letter-spacing: 0.04em;
}

.ai-service-copy h3 {
  margin: 5px 0;
  color: var(--home-navy);
  font-size: 1.25rem;
  letter-spacing: -0.04em;
}

.ai-service-copy p {
  margin: 0;
  color: #64748b;
  font-size: 0.73rem;
  line-height: 1.6;
}

.ai-service-link {
  display: flex;
  grid-column: 1 / -1;
  margin-top: 17px;
  padding-top: 13px;
  align-items: center;
  justify-content: space-between;
  color: var(--home-blue);
  border-top: 1px solid #edf1f6;
  font-size: 0.78rem;
  font-weight: 750;
}

.ai-service-link i {
  font-size: 1rem;
  font-style: normal;
  transition: transform 180ms ease;
}

.ai-service-card:hover .ai-service-link i {
  transform: translateX(4px);
}

/* ---------- AI Use Cases ---------- */
.section-use-cases {
  padding-bottom: 78px;
  background: #fff;
}

.use-case-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  overflow: hidden;
  border: 1px solid var(--home-line);
  border-radius: 22px;
  background: #fff;
  box-shadow: 0 18px 55px rgba(15, 23, 42, 0.06);
}

.use-case-card {
  position: relative;
  min-height: 285px;
  padding: 25px;
  border-right: 1px solid var(--home-line);
  background: linear-gradient(180deg, #fff, #fbfdff);
}

.use-case-card:last-child {
  border-right: 0;
}

.use-case-card::after {
  position: absolute;
  right: -35px;
  bottom: -55px;
  width: 130px;
  height: 130px;
  content: "";
  border-radius: 50%;
  background: rgba(37, 99, 235, 0.05);
}

.use-case-num {
  position: absolute;
  top: 25px;
  right: 24px;
  color: #cbd5e1;
  font-size: 0.64rem;
  font-weight: 850;
  letter-spacing: 0.12em;
}

.use-case-icon {
  display: grid;
  width: 45px;
  height: 45px;
  place-items: center;
  color: var(--home-blue);
  border: 1px solid #dbeafe;
  border-radius: 14px;
  background: #eff6ff;
}

.use-case-icon svg {
  width: 23px;
  height: 23px;
}

.use-case-card h3 {
  margin: 42px 0 10px;
  color: var(--home-navy);
  font-size: 1.05rem;
  font-weight: 780;
}

.use-case-card p {
  margin: 0;
  color: #64748b;
  font-size: 0.77rem;
  line-height: 1.75;
}

.use-case-value {
  position: absolute;
  z-index: 1;
  bottom: 24px;
  left: 25px;
  color: var(--home-blue);
  font-size: 0.68rem;
  font-weight: 780;
}

.use-case-foot {
  display: flex;
  padding: 18px 22px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border: 1px solid var(--home-line);
  border-top: 0;
  border-radius: 0 0 16px 16px;
  background: #f8fafc;
}

.use-case-foot p {
  margin: 0;
  color: #64748b;
  font-size: 0.75rem;
}

.use-case-foot strong {
  margin-right: 7px;
  color: var(--home-navy);
}

.use-case-foot a {
  color: var(--home-blue);
  font-size: 0.74rem;
  font-weight: 780;
  white-space: nowrap;
}

.btn-light {
  color: var(--home-navy);
  border-color: #fff;
  background: #fff;
}

.btn-light:hover {
  color: var(--home-blue);
  background: #eff6ff;
  transform: translateY(-2px);
}

.process-text-link {
  color: #bfdbfe;
  font-size: 0.8rem;
  font-weight: 700;
}

/* ---------- Guarantee ---------- */
.section-guarantee {
  background: #fff;
}

.guarantee-panel {
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.guarantee-head {
  max-width: 760px;
  margin: 0 0 48px;
  text-align: left;
}

.guarantee-title {
  margin: 0;
  color: var(--home-ink);
  font-size: clamp(2rem, 4vw, 3.45rem);
  font-weight: 790;
  line-height: 1.08;
  letter-spacing: -0.052em;
}

.guarantee-sub {
  margin: 18px 0 0;
  color: var(--home-muted);
  font-size: 1rem;
  line-height: 1.8;
}

.guarantee-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
}

.guarantee-item {
  position: relative;
  min-height: 260px;
  padding: 24px;
  border: 1px solid var(--home-line);
  border-radius: 20px;
  background: #fff;
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.guarantee-item:hover {
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
  transform: translateY(-4px);
}

.guarantee-icon {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  color: var(--home-blue);
  border-radius: 14px;
  background: #edf4ff;
}

.guarantee-item-num {
  position: absolute;
  top: 26px;
  right: 24px;
  color: #d7e0ec;
  font-size: 0.67rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.guarantee-item-title {
  margin: 30px 0 10px;
  color: var(--home-navy);
  font-size: 1rem;
  font-weight: 780;
}

.guarantee-item-text {
  margin: 0;
  color: #64748b;
  font-size: 0.78rem;
  line-height: 1.75;
}

.guarantee-pay {
  display: flex;
  margin-top: 20px;
  padding: 18px 22px;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  border: 1px solid var(--home-line);
  border-radius: 15px;
  background: #f8fafc;
}

.guarantee-pay-label {
  margin-right: auto;
  color: #64748b;
  font-size: 0.76rem;
  font-weight: 700;
}

.pay-badge {
  display: inline-flex;
  padding: 7px 10px;
  align-items: center;
  gap: 6px;
  color: #475569;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  background: #fff;
  font-size: 0.7rem;
  font-weight: 700;
}

.pay-alipay svg { color: #1677ff; }
.pay-wechat svg { color: #07c160; }

/* ---------- Feedback ---------- */
.section-wechat {
  background: linear-gradient(180deg, #f5f8fe 0%, #f8fbff 100%);
}

.section-wechat .section-head {
  margin-right: auto;
  margin-left: auto;
  text-align: center;
}

.feedback-strip {
  display: flex;
  margin: -20px 0 28px;
  justify-content: center;
  gap: 8px;
}

.feedback-strip span {
  display: inline-flex;
  padding: 7px 11px;
  align-items: center;
  gap: 7px;
  color: #64748b;
  border: 1px solid var(--home-line);
  border-radius: 999px;
  background: #fff;
  font-size: 0.69rem;
  font-weight: 700;
}

.feedback-strip i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #22c55e;
}

.wechat {
  max-width: 900px;
  margin: 0 auto;
  overflow: hidden;
  border: 1px solid var(--home-line);
  border-radius: 25px;
  background: #eef3f8;
  box-shadow: 0 28px 70px rgba(15, 23, 42, 0.12);
}

.wechat-bar {
  min-height: 58px;
  color: var(--home-navy);
  border-bottom: 1px solid var(--home-line);
  background: rgba(255, 255, 255, 0.95);
}

.wechat-bar-title {
  font-weight: 750;
}

.wechat-scroll {
  height: 430px;
  padding: 22px 5.5%;
  background:
    radial-gradient(circle at 20% 0%, rgba(37, 99, 235, 0.06), transparent 32%),
    #eef3f8;
}

.wechat-track {
  gap: 13px;
}

.msg-bubble {
  max-width: 570px;
  padding: 12px 15px;
  border-radius: 15px;
  font-size: 0.81rem;
  line-height: 1.65;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.05);
}

.msg-left .msg-bubble {
  border: 1px solid #e2e8f0;
  background: #fff;
}

.msg-right .msg-bubble {
  color: #fff;
  background: var(--home-blue);
}

.msg-avatar-self {
  background: var(--home-navy);
}

.wechat-input {
  border-top: 1px solid var(--home-line);
  background: #fff;
}

.wechat-input-box {
  border-color: #e2e8f0;
  background: #f8fafc;
}

/* ---------- FAQ ---------- */
.section-faq {
  background: #fff;
}

.section-faq .section-head {
  margin-right: auto;
  margin-left: auto;
  text-align: center;
}

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

.section-faq .faq-item {
  margin: 0;
  border: 0;
  border-bottom: 1px solid var(--home-line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.section-faq .faq-item:first-child {
  border-top: 1px solid var(--home-line);
}

.section-faq .faq-item:hover,
.section-faq .faq-item.open {
  border-color: #bfd2ed;
  background: #f8fbff;
  box-shadow: none;
}

.section-faq .faq-trigger {
  min-height: 80px;
  padding: 20px 23px;
}

.section-faq .faq-q {
  color: var(--home-navy);
  font-size: 0.96rem;
  font-weight: 720;
}

.section-faq .faq-icon {
  color: var(--home-blue);
  background: #edf4ff;
}

.section-faq .faq-item.open .faq-icon {
  background: var(--home-blue);
}

.section-faq .faq-body > p {
  padding: 0 68px 24px 23px;
  color: #64748b;
  font-size: 0.85rem;
  line-height: 1.8;
}

/* ---------- Knowledge ---------- */
.section-knowledge {
  background: #f8fbff;
}

.kb-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.kb-card {
  position: relative;
  display: flex;
  min-height: 300px;
  padding: 24px;
  flex-direction: column;
  color: var(--home-ink);
  border: 1px solid var(--home-line);
  border-radius: 20px;
  background: #fff;
  box-shadow: none;
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
}

.kb-card:hover {
  border-color: #bfd1eb;
  box-shadow: 0 22px 55px rgba(37, 99, 235, 0.1);
  transform: translateY(-5px);
}

.kb-card-featured {
  color: #fff;
  border-color: transparent;
  background:
    radial-gradient(circle at 90% 0%, rgba(124, 58, 237, 0.4), transparent 36%),
    linear-gradient(145deg, #0f172a, #183b7a);
}

.kb-card-tag {
  align-self: flex-start;
  padding: 5px 8px;
  color: var(--home-blue);
  border-radius: 6px;
  background: #edf4ff;
  font-size: 0.61rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.kb-card-featured .kb-card-tag {
  color: #bfdbfe;
  background: rgba(255, 255, 255, 0.1);
}

.kb-card-icon {
  position: absolute;
  top: 22px;
  right: 22px;
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  color: #94a3b8;
  border: 1px solid #e2e8f0;
  border-radius: 50%;
  font-size: 0.8rem;
}

.kb-card-featured .kb-card-icon {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.22);
}

.kb-card h3 {
  margin: auto 0 12px;
  color: var(--home-navy);
  font-size: 1.1rem;
  font-weight: 780;
  line-height: 1.4;
  letter-spacing: -0.025em;
}

.kb-card:hover h3 {
  color: var(--home-blue);
}

.kb-card-featured h3,
.kb-card-featured:hover h3 {
  color: #fff;
}

.kb-card p {
  display: -webkit-box;
  margin: 0;
  overflow: hidden;
  color: #718096;
  font-size: 0.75rem;
  line-height: 1.7;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.kb-card-featured p {
  color: #bac8dc;
}

.kb-card-link {
  margin-top: 21px;
  color: #bfdbfe;
  font-size: 0.74rem;
  font-weight: 750;
}

.kb-card-link i {
  margin-left: 5px;
  font-style: normal;
}

.kb-more {
  margin-top: 28px;
  text-align: center;
}

.kb-more .btn {
  border-radius: 12px;
}

/* ---------- CTA ---------- */
.section-cta {
  padding-top: 48px;
  background: #f8fbff;
}

.cta-panel {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(250px, 0.45fr);
  align-items: center;
  gap: 70px;
  padding: 60px 70px;
  overflow: hidden;
  color: #fff;
  border: 0;
  border-radius: 30px;
  background:
    radial-gradient(circle at 92% 12%, rgba(124, 58, 237, 0.48), transparent 30%),
    linear-gradient(135deg, #0b1220 0%, #112954 58%, #17489e 100%);
  box-shadow: 0 34px 90px rgba(15, 23, 42, 0.22);
}

.cta-panel::before {
  position: absolute;
  top: -150px;
  right: -120px;
  width: 460px;
  height: 460px;
  content: "";
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  box-shadow: 0 0 0 55px rgba(255, 255, 255, 0.025), 0 0 0 110px rgba(255, 255, 255, 0.018);
}

.cta-copy {
  position: relative;
  z-index: 1;
}

.cta-title {
  margin: 0;
  color: #fff;
  font-size: clamp(2.35rem, 4.5vw, 4rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.06em;
}

.cta-sub {
  max-width: 600px;
  margin: 22px 0 0;
  color: #b8c7dd;
  font-size: 0.92rem;
  line-height: 1.85;
}

.cta-points {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 24px;
}

.cta-points span {
  padding: 7px 10px;
  color: #cfe0fa;
  border: 1px solid rgba(191, 219, 254, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  font-size: 0.68rem;
  font-weight: 700;
}

.cta-copy .actions {
  display: flex;
  gap: 11px;
  margin-top: 30px;
}

.cta-copy .btn {
  min-height: 50px;
  border-radius: 13px;
}

.btn-ghost-light {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.07);
}

.btn-ghost-light:hover {
  border-color: rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.13);
  transform: translateY(-2px);
}

.cta-qr {
  position: relative;
  z-index: 1;
  width: 240px;
  padding: 17px;
  justify-self: end;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
}

.cta-qr-kicker {
  display: block;
  margin-bottom: 10px;
  color: #bfdbfe;
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-align: center;
}

.qr-frame {
  padding: 10px;
  border-radius: 14px;
  background: #fff;
}

.qr-frame img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.qr-cap {
  margin: 12px 0 0;
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.55;
  text-align: center;
}

.qr-cap small {
  color: #aebed3;
  font-size: 0.66rem;
  font-weight: 500;
}

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .home-v2-topbar .brand-role { display: none; }
  .home-v2-topbar .nav > a:not(.btn) { padding-inline: 8px; font-size: 0.79rem; }
  .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(370px, 0.78fr); gap: 50px; }
  .hero-title { font-size: clamp(3rem, 6vw, 4.4rem); }
  .pro-plan-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .use-case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .use-case-card:nth-child(2) { border-right: 0; }
  .use-case-card:nth-child(-n + 2) { border-bottom: 1px solid var(--home-line); }
  .guarantee-grid { grid-template-columns: repeat(2, 1fr); }
  .kb-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .section { padding: 78px 0; }
  .section-head-split { grid-template-columns: 1fr; gap: 16px; }
  .section-head-split .section-sub { max-width: 680px; }
  .home-v2-topbar .nav > a:not(.btn):not(.nav-key) { display: none; }
  .nav-indicator { display: none; }
  .hero { padding: 78px 0 92px; }
  .hero-grid { grid-template-columns: 1fr; gap: 66px; }
  .hero-copy { max-width: 720px; }
  .hero-aside { width: min(100%, 560px); min-height: 480px; }
  .ai-visual-stage { height: 480px; }
  .hero::after { right: -190px; }
  .cta-panel { grid-template-columns: 1fr; gap: 45px; padding: 50px; }
  .cta-qr { justify-self: start; }
}

@media (max-width: 680px) {
  .shell { width: min(100% - 32px, 1180px); }
  .section { padding: 66px 0; }
  .section-head { margin-bottom: 34px; }
  .section-title,
  .guarantee-title { font-size: clamp(1.85rem, 9vw, 2.65rem); }
  .home-v2-topbar .topbar-inner { min-height: 66px; }
  .home-v2-topbar .brand-mark,
  .home-v2-topbar .brand-logo { width: 32px; height: 32px; }
  .home-v2-topbar .brand-name { font-size: 0.95rem; }
  .home-v2-topbar .nav-key { display: none; }
  .home-v2-topbar .nav-cta { min-height: 38px; margin-left: 0; padding: 9px 12px; }
  .hero { padding: 62px 0 78px; }
  .hero::after { display: none; }
  .eyebrow { max-width: 100%; font-size: 0.66rem; }
  .eyebrow i,
  .eyebrow i + span { display: none; }
  .hero-title { font-size: clamp(2.55rem, 13.5vw, 3.7rem); line-height: 1.04; }
  .hero-lead { font-size: 0.96rem; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .hero-trust { gap: 10px 14px; }
  .hero-service-meta { margin-top: 23px; }
  .hero-aside { min-height: 410px; }
  .ai-visual-stage { height: 410px; border-radius: 25px; }
  .ai-ring-one { width: 270px; height: 270px; }
  .ai-ring-two { width: 220px; height: 220px; }
  .ai-ring-three { width: 175px; height: 175px; }
  .ai-core { width: 104px; height: 104px; }
  .ai-core svg { width: 52px; height: 52px; }
  .ai-node { padding: 6px 8px; font-size: 0.5rem; }
  .ai-node-files { left: 5%; }
  .ai-node-code { right: 5%; }
  .ai-node-image { right: 4%; }
  .ai-node-voice { left: 4%; }
  .ai-visual-caption { right: 14px; bottom: 14px; left: 14px; padding: 13px 14px; }
  .plan-notice { grid-template-columns: auto 1fr; }
  .plan-notice a { grid-column: 2; }
  .pro-plan-list { grid-template-columns: 1fr; }
  .plans-foot-actions { align-items: stretch; flex-direction: column; }
  .plans-foot-actions .btn { width: 100%; }
  .use-case-grid { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; }
  .use-case-card { min-width: 265px; min-height: 260px; border-right: 1px solid var(--home-line) !important; border-bottom: 0 !important; scroll-snap-align: start; }
  .use-case-foot { align-items: flex-start; flex-direction: column; gap: 10px; }
  .section-ai-services { padding: 58px 0; }
  .ai-service-grid { grid-template-columns: 1fr; }
  .ai-service-card { min-height: 175px; }
  .guarantee-grid { grid-template-columns: 1fr; }
  .guarantee-item { min-height: auto; }
  .guarantee-pay { align-items: flex-start; flex-wrap: wrap; justify-content: flex-start; }
  .guarantee-pay-label { width: 100%; margin: 0 0 5px; }
  .feedback-strip { flex-wrap: wrap; }
  .wechat-scroll { height: 460px; padding-inline: 14px; }
  .msg-bubble { font-size: 0.76rem; }
  .section-faq .faq-trigger { min-height: 70px; padding-inline: 15px; }
  .section-faq .faq-body > p { padding-right: 50px; padding-left: 15px; }
  .kb-grid { grid-template-columns: 1fr; }
  .kb-card { min-height: 245px; }
  .cta-panel { padding: 36px 24px; border-radius: 23px; }
  .cta-title { font-size: clamp(2.15rem, 11vw, 3rem); }
  .cta-copy .actions { align-items: stretch; flex-direction: column; }
  .cta-copy .btn { width: 100%; }
  .cta-qr { width: min(100%, 240px); justify-self: center; }
}

@media (max-width: 420px) {
  .home-v2-topbar .nav-cta span { display: inline; }
  .home-v2-topbar .nav-cta svg { display: none; }
  .hero-capabilities span { font-size: 0.64rem; }
  .hero-service-meta { gap: 15px; }
  .ai-node-image,
  .ai-node-voice { display: none; }
  .plan-notice { padding: 14px; }
  .plan-notice a { grid-column: 1 / -1; padding-left: 38px; white-space: normal; }
  .pro-plan-row { padding: 21px; }
}

@media (prefers-reduced-motion: reduce) {
  .pro-plan-row,
  .ai-service-card,
  .guarantee-item,
  .kb-card,
  .home-v2-topbar,
  .ai-service-link i {
    transition: none;
  }

  .ai-ring,
  .ai-core,
  .ai-core-glow,
  .ai-node {
    animation: none;
  }
}