:root {
  --ink: #17201d;
  --muted: #63716b;
  --line: #dce5df;
  --paper: #fbfdfb;
  --soft: #eef6f2;
  --teal: #0f766e;
  --teal-dark: #0b4f4a;
  --amber: #f0a735;
  --coral: #d65f4d;
  --charcoal: #0d1715;
  --white: #ffffff;
  --shadow: 0 24px 60px rgba(16, 33, 29, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  letter-spacing: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.notice {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 44px;
  padding: 10px 18px;
  background: var(--charcoal);
  color: rgba(255, 255, 255, 0.9);
  font-size: 14px;
}

.notice__badge {
  color: var(--charcoal);
  background: var(--amber);
  padding: 4px 8px;
  border-radius: 999px;
  font-weight: 800;
}

.notice a {
  color: #9ee8df;
  font-weight: 800;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 0 max(24px, calc((100vw - 1120px) / 2));
  background: rgba(251, 253, 251, 0.9);
  border-bottom: 1px solid rgba(220, 229, 223, 0.8);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
}

.brand__logo {
  display: block;
  width: 186px;
  height: 44px;
  transition: transform 0.25s ease, filter 0.25s ease;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--muted);
  font-weight: 700;
}

.site-nav a {
  position: relative;
  transition: color 0.2s ease;
}

.site-nav a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 2px;
  border-radius: 999px;
  background: var(--teal);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.22s ease;
}

.site-nav a:hover {
  color: var(--teal-dark);
}

.nav-cta {
  padding: 10px 16px;
  color: var(--white) !important;
  background: var(--teal);
  border-radius: 8px;
}

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.menu-button span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

.hero {
  position: relative;
  min-height: calc(100vh - 116px);
  display: grid;
  align-items: center;
  overflow: hidden;
  color: var(--white);
}

.hero__media,
.hero__overlay {
  position: absolute;
  inset: 0;
}

.hero__media {
  background-image: url("assets/hero-ai-service.png");
  background-size: cover;
  background-position: center;
  transform: scale(1.02);
}

.hero__overlay {
  background:
    linear-gradient(90deg, rgba(8, 15, 14, 0.92) 0%, rgba(8, 15, 14, 0.76) 42%, rgba(8, 15, 14, 0.32) 100%),
    linear-gradient(0deg, rgba(8, 15, 14, 0.78), rgba(8, 15, 14, 0.08) 35%);
}

.hero__content {
  position: relative;
  z-index: 1;
  padding: 88px 0 112px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #9ee8df;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  width: min(820px, 100%);
  margin-bottom: 24px;
  font-size: clamp(44px, 6vw, 74px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-title span,
.hero-title strong {
  display: block;
}

.hero-title span {
  color: rgba(255, 255, 255, 0.96);
}

.hero-title strong {
  margin-top: 2px;
  color: var(--white);
  font-weight: 950;
}

.hero__lead {
  width: min(760px, 100%);
  color: rgba(255, 255, 255, 0.84);
  font-size: 22px;
  line-height: 1.75;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 900;
  transition:
    transform 0.22s ease,
    box-shadow 0.22s ease,
    border-color 0.22s ease,
    background 0.22s ease,
    color 0.22s ease;
}

.button--primary {
  color: var(--charcoal);
  background: var(--amber);
}

.button--secondary {
  color: var(--teal-dark);
  background: #e2f4ef;
}

.button--package {
  color: var(--teal-dark);
  background: #e2f4ef;
}

.button--package:hover {
  color: var(--charcoal);
  background: var(--amber);
}

.button--ghost {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.36);
  background: rgba(255, 255, 255, 0.08);
}

.hero__assurance {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  width: min(760px, 100%);
  margin-top: 26px;
}

.hero__assurance span {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid rgba(158, 232, 223, 0.26);
  border-radius: 8px;
  color: rgba(255, 255, 255, 0.9);
  background: rgba(15, 118, 110, 0.18);
  font-size: 16px;
  font-weight: 800;
  transition: transform 0.24s ease, border-color 0.24s ease, background 0.24s ease;
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 160px));
  gap: 12px;
  margin-top: 34px;
}

.hero__stats div {
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  transition: transform 0.24s ease, border-color 0.24s ease, background 0.24s ease;
}

.hero__stats strong,
.hero__stats span {
  display: block;
}

.hero__stats strong {
  margin-bottom: 4px;
  font-size: 18px;
}

.hero__stats span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
}

.section {
  padding: 88px 0;
}

.section--quiet {
  background: var(--soft);
}

.section-heading {
  width: min(720px, 100%);
  margin: 0 auto 38px;
  text-align: center;
}

.section-heading--left {
  margin-left: 0;
  text-align: left;
}

.section-heading h2,
.contact h2 {
  margin-bottom: 12px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.15;
  letter-spacing: 0;
}

.section-heading p,
.benefit p,
.step p,
.compare-card p,
.contact p,
.site-footer p,
.qr-card p {
  color: var(--muted);
  line-height: 1.75;
}

.guide-panel {
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(0, 1.35fr);
  gap: 24px;
  align-items: stretch;
}

.guide-panel__intro {
  position: relative;
  min-height: 430px;
  padding: 42px;
  color: var(--white);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.96), rgba(13, 23, 21, 0.98)),
    var(--teal-dark);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.guide-panel__intro::after {
  content: "";
  position: absolute;
  right: -72px;
  bottom: -72px;
  width: 210px;
  height: 210px;
  border: 28px solid rgba(255, 255, 255, 0.09);
  border-radius: 50%;
}

.guide-panel__intro .eyebrow {
  color: #a7f3e8;
}

.guide-panel__intro h2 {
  position: relative;
  z-index: 1;
  margin-bottom: 18px;
  font-size: clamp(34px, 4.3vw, 54px);
  line-height: 1.12;
}

.guide-panel__intro p {
  position: relative;
  z-index: 1;
  color: rgba(255, 255, 255, 0.78);
  font-size: 18px;
  line-height: 1.85;
}

.guide-panel__chips {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.guide-panel__chips span {
  padding: 9px 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.92);
  background: rgba(255, 255, 255, 0.08);
  font-size: 13px;
  font-weight: 900;
}

.benefit-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.benefit,
.step,
.price-card,
.compare-card,
.qr-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  transition:
    transform 0.28s ease,
    border-color 0.28s ease,
    box-shadow 0.28s ease,
    background 0.28s ease;
}

.benefit {
  min-height: 206px;
  padding: 30px;
  box-shadow: 0 18px 44px rgba(16, 33, 29, 0.08);
}

.icon {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  margin-bottom: 18px;
  border-radius: 8px;
  color: var(--teal-dark);
  background: #d9f1eb;
  font-size: 21px;
  font-weight: 900;
  transition: transform 0.28s ease, color 0.28s ease, background 0.28s ease;
}

.benefit h3,
.step h3,
.price-card h3,
.compare-card h3,
.qr-card h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.benefit h3 {
  font-size: 24px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.step {
  position: relative;
  padding: 30px;
}

.step span {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin-bottom: 20px;
  border-radius: 50%;
  color: var(--white);
  background: var(--coral);
  font-weight: 900;
  transition: transform 0.28s ease, background 0.28s ease;
}

.section--pricing {
  background: #f7faf8;
}

.advantages-section {
  background: var(--paper);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.advantage-card {
  min-height: 236px;
}

.price-card {
  display: flex;
  flex-direction: column;
  min-height: 420px;
  padding: 26px;
  box-shadow: 0 12px 32px rgba(16, 33, 29, 0.07);
}

.price-card--featured {
  border-color: rgba(15, 118, 110, 0.55);
  box-shadow: var(--shadow);
  transform: translateY(-12px);
}

.tag {
  width: fit-content;
  margin-bottom: 18px;
  padding: 6px 10px;
  color: var(--teal-dark);
  background: #dff4ef;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 900;
  transition: transform 0.25s ease, background 0.25s ease;
}

.price {
  margin: 8px 0 24px;
  font-size: 46px;
  font-weight: 900;
  line-height: 1;
}

.price span {
  font-size: 22px;
}

.price small {
  color: var(--muted);
  font-size: 15px;
}

ul {
  padding-left: 20px;
}

li {
  margin: 10px 0;
  color: var(--muted);
}

.price-card .button {
  width: 100%;
  margin-top: auto;
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.compare-card {
  padding: 30px;
}

.compare-card--muted {
  background: #fbf6f2;
}

.compare-card--strong {
  color: var(--white);
  background: var(--teal-dark);
  border-color: var(--teal-dark);
}

.compare-card--strong p,
.compare-card--strong li {
  color: rgba(255, 255, 255, 0.78);
}

.faq-layout {
  display: grid;
  grid-template-columns: minmax(300px, 0.72fr) minmax(0, 1.28fr);
  gap: 28px;
  align-items: stretch;
}

.faq-aside {
  position: sticky;
  top: 104px;
  display: flex;
  flex-direction: column;
  min-height: 444px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 18px 44px rgba(16, 33, 29, 0.08);
}

.faq-aside h2 {
  margin-bottom: 14px;
  font-size: clamp(42px, 5vw, 64px);
  line-height: 1.06;
}

.faq-aside p {
  color: var(--muted);
  line-height: 1.75;
}

.faq-aside__list {
  display: grid;
  gap: 12px;
  margin: 24px 0;
}

.faq-aside__list div {
  padding: 15px;
  border-radius: 8px;
  background: var(--soft);
  transition: transform 0.24s ease, background 0.24s ease;
}

.faq-aside__list strong,
.faq-aside__list span {
  display: block;
}

.faq-aside__list strong {
  margin-bottom: 4px;
  color: var(--teal-dark);
  font-size: 15px;
}

.faq-aside__list span {
  color: var(--muted);
  line-height: 1.55;
}

.faq-aside .button {
  width: 100%;
  margin-top: auto;
}

.faq-list {
  display: grid;
  gap: 14px;
  align-content: stretch;
}

.faq-item {
  position: relative;
  width: 100%;
  min-height: 100px;
  padding: 28px 60px 28px 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  text-align: left;
  cursor: pointer;
  box-shadow: 0 12px 30px rgba(16, 33, 29, 0.05);
  transition:
    transform 0.24s ease,
    border-color 0.24s ease,
    box-shadow 0.24s ease,
    background 0.24s ease;
}

.faq-item span {
  display: block;
  color: var(--ink);
  font-size: 18px;
  font-weight: 900;
}

.faq-item strong {
  position: absolute;
  top: 23px;
  right: 28px;
  color: var(--teal);
  font-size: 22px;
  transition: transform 0.24s ease, color 0.24s ease;
}

.faq-item p {
  display: none;
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.faq-item[aria-expanded="true"] p {
  display: block;
}

.contact-section {
  color: var(--white);
  background: var(--charcoal);
}

.contact {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.contact .eyebrow {
  color: #9ee8df;
}

.contact p {
  color: rgba(255, 255, 255, 0.72);
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.qr-card {
  padding: 24px;
  color: var(--ink);
  text-align: center;
}

.qr-image {
  display: block;
  width: min(100%, 260px);
  aspect-ratio: 1;
  margin: 0 auto 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  object-fit: cover;
  background: var(--white);
  transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
}

.qr-placeholder {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  margin-bottom: 18px;
  border: 1px dashed rgba(15, 118, 110, 0.5);
  border-radius: 8px;
  color: var(--teal-dark);
  background:
    linear-gradient(90deg, rgba(15, 118, 110, 0.1) 12px, transparent 1%) center / 28px 28px,
    linear-gradient(rgba(15, 118, 110, 0.1) 12px, transparent 1%) center / 28px 28px,
    #eef8f5;
  font-weight: 900;
}

.qr-placeholder--alt {
  color: #7a4415;
  border-color: rgba(240, 167, 53, 0.7);
  background:
    linear-gradient(90deg, rgba(240, 167, 53, 0.15) 12px, transparent 1%) center / 28px 28px,
    linear-gradient(rgba(240, 167, 53, 0.15) 12px, transparent 1%) center / 28px 28px,
    #fff7e7;
}

@media (hover: hover) and (pointer: fine) {
  .brand:hover .brand__logo {
    transform: translateY(-1px);
    filter: drop-shadow(0 10px 18px rgba(16, 33, 29, 0.12));
  }

  .site-nav a:not(.nav-cta):hover::after {
    transform: scaleX(1);
  }

  .nav-cta:hover,
  .button:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 28px rgba(16, 33, 29, 0.16);
  }

  .button--secondary:hover {
    border-color: rgba(15, 118, 110, 0.22);
    background: #d6f0e9;
  }

  .button--ghost:hover {
    border-color: rgba(255, 255, 255, 0.56);
    background: rgba(255, 255, 255, 0.16);
  }

  .hero__assurance span:hover,
  .hero__stats div:hover {
    transform: translateY(-3px);
    border-color: rgba(158, 232, 223, 0.56);
    background: rgba(15, 118, 110, 0.28);
  }

  .benefit:hover,
  .step:hover,
  .price-card:hover,
  .compare-card:hover,
  .qr-card:hover {
    transform: translateY(-8px);
    border-color: rgba(15, 118, 110, 0.34);
    box-shadow: 0 24px 54px rgba(16, 33, 29, 0.14);
  }

  .price-card--featured:hover {
    transform: translateY(-18px);
  }

  .benefit:hover .icon {
    color: var(--white);
    background: var(--teal);
    transform: rotate(-4deg) scale(1.06);
  }

  .step:hover span {
    background: var(--teal);
    transform: scale(1.08);
  }

  .price-card:hover .tag {
    background: #f7d99c;
    transform: translateX(2px);
  }

  .compare-card--strong:hover {
    background: #0a5d56;
  }

  .faq-aside__list div:hover {
    transform: translateX(4px);
    background: #e2f4ef;
  }

  .faq-item:hover {
    transform: translateY(-4px);
    border-color: rgba(15, 118, 110, 0.34);
    box-shadow: 0 18px 40px rgba(16, 33, 29, 0.1);
  }

  .faq-item:hover strong {
    color: var(--coral);
    transform: rotate(90deg);
  }

  .qr-card:hover .qr-image {
    transform: scale(1.035);
    border-color: rgba(15, 118, 110, 0.35);
    box-shadow: 0 16px 34px rgba(16, 33, 29, 0.16);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

.site-footer {
  padding: 42px 0;
  background: #f1f5f2;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  color: var(--muted);
  font-weight: 800;
}

@media (max-width: 980px) {
  .guide-panel,
  .pricing-grid,
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .guide-panel {
    grid-template-columns: 1fr;
  }

  .price-card--featured {
    transform: none;
  }
}

@media (max-width: 760px) {
  .notice {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .site-header {
    padding: 0 20px;
  }

  .brand__logo {
    width: 156px;
    height: auto;
  }

  .menu-button {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 20px 20px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 14px 0;
  }

  .nav-cta {
    justify-content: center;
    text-align: center;
  }

  .hero {
    min-height: auto;
  }

  .hero__content {
    padding: 72px 0 88px;
  }

  h1 {
    font-size: 42px;
  }

  .hero__lead {
    font-size: 17px;
  }

  .hero__assurance {
    gap: 8px;
  }

  .hero__assurance span {
    width: 100%;
    justify-content: center;
    text-align: center;
  }

  .hero__stats,
  .steps,
  .compare-grid,
  .faq-layout,
  .contact,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .benefit-grid,
  .pricing-grid,
  .advantages-grid,
  .contact-cards {
    grid-template-columns: 1fr;
  }

  .guide-panel__intro {
    min-height: auto;
    padding: 30px;
  }

  .section {
    padding: 64px 0;
  }

  .container {
    width: min(100% - 28px, 1120px);
  }

  .footer-links {
    flex-direction: column;
    gap: 12px;
  }
}