:root {
  --ink: #0c0d10;
  --ink-soft: #2a2d36;
  --muted: #5c6370;
  --paper: #f3f4f6;
  --paper-2: #e8eaee;
  --line: rgba(12, 13, 16, 0.12);
  --accent: #0e8f9f;
  --accent-deep: #0a6b77;
  --white: #ffffff;
  --radius: 18px;
  --font-display: "Outfit", system-ui, sans-serif;
  --font-body: "Manrope", system-ui, sans-serif;
  --max: 1160px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

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

h1,
h2,
h3,
strong {
  font-family: var(--font-display);
  letter-spacing: -0.03em;
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border-radius: 999px;
  padding: 0.72rem 1.25rem;
  font-weight: 700;
  font-size: 0.92rem;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn--solid {
  background: var(--ink);
  color: var(--white);
}

.btn--solid:hover {
  background: var(--accent-deep);
}

.btn--ghost {
  border-color: var(--line);
  background: transparent;
  color: var(--ink);
}

.btn--ghost:hover {
  border-color: var(--ink);
}

.btn--lg {
  padding: 0.95rem 1.55rem;
  font-size: 1rem;
}

.text-link {
  display: inline-block;
  margin-top: 1.5rem;
  font-weight: 700;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 0.15rem;
}

.text-link:hover {
  color: var(--accent-deep);
  border-color: var(--accent-deep);
}

/* ticker */
.ticker {
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--ink);
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ticker__track {
  display: flex;
  gap: 2.5rem;
  width: max-content;
  padding: 0.55rem 0;
  animation: marquee 28s linear infinite;
}

.ticker__track span {
  white-space: nowrap;
}

@keyframes marquee {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem clamp(1rem, 3vw, 2rem);
  background: rgba(243, 244, 246, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
}

.brand__mark {
  color: var(--accent-deep);
  display: grid;
  place-items: center;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand__text strong {
  font-size: 1.05rem;
  font-weight: 800;
}

.brand__text em {
  font-style: normal;
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.site-nav > a:not(.btn) {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.site-nav > a:not(.btn):hover {
  color: var(--accent-deep);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
}

/* hero */
.hero {
  position: relative;
  overflow: hidden;
  min-height: min(92vh, 900px);
  padding: clamp(2.5rem, 6vw, 5rem) clamp(1rem, 3vw, 2rem) 3rem;
  background:
    radial-gradient(1000px 500px at 85% 15%, rgba(14, 143, 159, 0.16), transparent 55%),
    linear-gradient(180deg, #f7f8fa 0%, var(--paper) 70%, var(--paper-2) 100%);
}

.hero__glow {
  position: absolute;
  inset: auto -10% -20% 40%;
  height: 55%;
  background: radial-gradient(circle, rgba(14, 143, 159, 0.12), transparent 65%);
  pointer-events: none;
}

.hero__grid {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 960px) {
  .hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3rem;
  }
}

.hero__copy h1 {
  margin: 0;
  font-size: clamp(2.8rem, 7.5vw, 5.6rem);
  line-height: 0.95;
  font-weight: 800;
}

.hero__line {
  display: block;
}

.hero__line--accent {
  color: var(--accent-deep);
}

.hero__lead {
  max-width: 34rem;
  margin: 1.4rem 0 0;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.8rem;
}

.hero__visual {
  display: grid;
  place-items: center;
}

.window-stack {
  position: relative;
  width: min(100%, 420px);
  aspect-ratio: 1 / 1.05;
}

.fake-window {
  position: absolute;
  inset: 12% 8% 8% 8%;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: 0 30px 60px rgba(12, 13, 16, 0.1);
}

.fake-window--back {
  transform: translate(18px, -22px) rotate(4deg);
  opacity: 0.45;
}

.fake-window--mid {
  transform: translate(-14px, -10px) rotate(-3deg);
  opacity: 0.7;
}

.fake-window--front {
  inset: 18% 4% 4% 10%;
  overflow: hidden;
  animation: floaty 5.5s ease-in-out infinite;
}

@keyframes floaty {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

.fake-window__bar {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--line);
  background: #fafafa;
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 600;
}

.fake-window__bar i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #d4d4d8;
}

.fake-window__bar i:nth-child(1) {
  background: #f87171;
}
.fake-window__bar i:nth-child(2) {
  background: #fbbf24;
}
.fake-window__bar i:nth-child(3) {
  background: #34d399;
}

.fake-window__bar span {
  margin-left: 0.5rem;
}

.fake-window__body {
  position: relative;
  padding: 1.1rem;
  min-height: 240px;
  background:
    linear-gradient(160deg, rgba(14, 143, 159, 0.08), transparent 45%),
    #fff;
}

.pulse-row {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.pulse-row span {
  height: 8px;
  border-radius: 999px;
  background: rgba(14, 143, 159, 0.25);
  animation: pulse 1.6s ease-in-out infinite;
}

.pulse-row span:nth-child(1) {
  width: 42%;
}
.pulse-row span:nth-child(2) {
  width: 28%;
  animation-delay: 0.2s;
}
.pulse-row span:nth-child(3) {
  width: 18%;
  animation-delay: 0.4s;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.45;
  }
  50% {
    opacity: 1;
  }
}

.fingerprint-ring {
  width: 110px;
  height: 110px;
  margin: 0.5rem auto 1rem;
  border-radius: 50%;
  border: 2px dashed rgba(14, 143, 159, 0.45);
  box-shadow: inset 0 0 0 18px rgba(14, 143, 159, 0.08);
  animation: spin 18s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.mini-log {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.mini-log li {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-soft);
  padding: 0.45rem 0.65rem;
  border-radius: 10px;
  background: rgba(12, 13, 16, 0.04);
}

/* claim */
.claim {
  padding: clamp(3rem, 8vw, 6rem) clamp(1rem, 3vw, 2rem);
  background: var(--ink);
  color: var(--white);
}

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

.claim h2 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1.05;
  font-weight: 800;
  max-width: 14ch;
}

.claim p {
  max-width: 40rem;
  margin: 1.4rem 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 1.08rem;
}

.claim .text-link {
  border-color: rgba(255, 255, 255, 0.7);
  color: #fff;
}

/* stats */
.stats {
  padding: 0 clamp(1rem, 3vw, 2rem);
  margin-top: -2.2rem;
}

.stats__inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: 0.8rem;
  grid-template-columns: 1fr;
}

@media (min-width: 760px) {
  .stats__inner {
    grid-template-columns: repeat(3, 1fr);
  }
}

.stat {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.3rem 1.2rem;
  box-shadow: 0 12px 30px rgba(12, 13, 16, 0.05);
}

.stat strong {
  display: block;
  font-size: clamp(2.4rem, 4vw, 3.2rem);
  line-height: 1;
  font-weight: 800;
}

.stat span {
  display: block;
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}

/* sections shared */
.section-head {
  max-width: var(--max);
  margin: 0 auto 2.2rem;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  line-height: 1.05;
  font-weight: 800;
  max-width: 16ch;
}

.section-lead {
  max-width: 38rem;
  margin: 1rem 0 0;
  color: var(--ink-soft);
}

.section-cta {
  max-width: var(--max);
  margin: 2rem auto 0;
}

.features,
.why,
.faq {
  padding: clamp(3.5rem, 8vw, 6rem) clamp(1rem, 3vw, 2rem);
}

.feature-grid {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: 1rem;
}

@media (min-width: 720px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1020px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.35rem 1.4rem;
  min-height: 210px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.feature:hover {
  border-color: rgba(14, 143, 159, 0.45);
  transform: translateY(-2px);
}

.feature h3 {
  margin: 0;
  font-size: 1.45rem;
  line-height: 1.15;
  font-weight: 800;
}

.feature p {
  margin: 0.85rem 0 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

/* reliability */
.reliability {
  padding: clamp(2rem, 5vw, 3rem) clamp(1rem, 3vw, 2rem) clamp(3.5rem, 8vw, 5rem);
}

.reliability__panel {
  max-width: var(--max);
  margin: 0 auto;
  border-radius: 28px;
  padding: clamp(1.8rem, 4vw, 3rem);
  background:
    linear-gradient(135deg, rgba(14, 143, 159, 0.12), transparent 40%),
    var(--paper-2);
  border: 1px solid var(--line);
}

.reliability__panel h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 800;
}

.reli-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.8rem;
}

@media (min-width: 860px) {
  .reli-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.reli-grid article {
  background: rgba(255, 255, 255, 0.72);
  border-radius: 16px;
  padding: 1.2rem 1.15rem;
  border: 1px solid rgba(12, 13, 16, 0.06);
}

.reli-grid h3 {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 800;
}

.reli-grid p {
  margin: 0.55rem 0 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* why */
.why {
  background: var(--white);
  border-block: 1px solid var(--line);
}

.why__intro {
  max-width: var(--max);
  margin: 0 auto 1.5rem;
}

.why__intro h2 {
  margin: 0;
  font-size: clamp(2rem, 4.5vw, 3.3rem);
  font-weight: 800;
  max-width: 14ch;
}

.why-list {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: 0;
}

.why-item {
  display: grid;
  gap: 0.4rem;
  padding: 1.35rem 0;
  border-top: 1px solid var(--line);
}

@media (min-width: 800px) {
  .why-item {
    grid-template-columns: 0.9fr 1.4fr;
    gap: 2rem;
    align-items: start;
  }
}

.why-item:last-child {
  border-bottom: 1px solid var(--line);
}

.why-item h3 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 800;
}

.why-item p {
  margin: 0;
  color: var(--ink-soft);
}

/* faq */
.faq-list {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: 0.65rem;
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.2rem 1rem;
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  padding: 1rem 0;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  float: right;
  color: var(--muted);
  font-weight: 500;
}

.faq-item[open] summary::after {
  content: "–";
}

.faq-item p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
  max-width: 48rem;
}

.faq-foot {
  max-width: var(--max);
  margin: 1.4rem auto 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* closing */
.closing {
  padding: clamp(3rem, 8vw, 5.5rem) clamp(1rem, 3vw, 2rem);
  background: var(--ink);
  color: #fff;
  text-align: center;
}

.closing__inner {
  max-width: 40rem;
  margin: 0 auto;
}

.closing h2 {
  margin: 0;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 800;
}

.closing p {
  margin: 1rem auto 1.6rem;
  color: rgba(255, 255, 255, 0.75);
}

.closing .btn--solid {
  background: var(--accent);
  color: #041318;
}

.closing .btn--solid:hover {
  background: #14b8c8;
}

/* footer */
.site-footer {
  padding: 2.5rem clamp(1rem, 3vw, 2rem) 2rem;
  background: #07080a;
  color: rgba(255, 255, 255, 0.72);
}

.footer__brand {
  max-width: var(--max);
  margin: 0 auto 1.5rem;
  display: grid;
  gap: 0.3rem;
}

.footer__brand strong {
  color: #fff;
  font-size: 1.2rem;
}

.footer__cols {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(2, minmax(0, 160px));
}

.footer__cols h4 {
  margin: 0 0 0.6rem;
  color: #fff;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer__cols a {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.92rem;
}

.footer__cols a:hover {
  color: #fff;
}

.footer__legal {
  max-width: var(--max);
  margin: 2rem auto 0;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.45);
}

/* reveal */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* mobile nav */
@media (max-width: 880px) {
  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: fixed;
    inset: 0 0 auto 0;
    top: 64px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0.35rem;
    padding: 1rem;
    background: rgba(243, 244, 246, 0.98);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.08);
  }

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

  .site-nav .btn {
    width: 100%;
  }

  .hero {
    min-height: auto;
  }

  .hero__visual {
    order: -1;
  }

  .window-stack {
    width: min(100%, 320px);
    aspect-ratio: 1 / 0.95;
  }
}

button.btn {
  font-family: inherit;
  cursor: pointer;
}

.linkish {
  display: block;
  margin-bottom: 0.35rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 0.92rem;
  cursor: pointer;
  text-align: left;
}

.linkish:hover {
  color: #fff;
}

body.modal-open {
  overflow: hidden;
}

.modal[hidden] {
  display: none !important;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(7, 8, 10, 0.55);
  backdrop-filter: blur(4px);
}

.modal__panel {
  position: relative;
  z-index: 1;
  width: min(100%, 420px);
  border-radius: 22px;
  padding: 1.6rem 1.4rem 1.4rem;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.22);
}

.modal__close {
  position: absolute;
  top: 0.7rem;
  right: 0.85rem;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 999px;
  background: rgba(12, 13, 16, 0.06);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  color: var(--ink-soft);
}

.modal__panel h2 {
  margin: 0;
  font-size: 1.55rem;
  font-weight: 800;
}

.modal__lead {
  margin: 0.7rem 0 1.1rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.contact-qr {
  display: grid;
  place-items: center;
  margin: 0 0 1rem;
}

.contact-qr[hidden] {
  display: none !important;
}

.contact-qr img {
  width: min(100%, 200px);
  height: auto;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #fff;
}

.contact-list {
  list-style: none;
  margin: 0 0 1.1rem;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.contact-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  padding: 0.75rem 0.85rem;
  border-radius: 12px;
  background: rgba(12, 13, 16, 0.04);
  font-size: 0.95rem;
}

.contact-list li span {
  color: var(--muted);
  font-weight: 600;
  flex-shrink: 0;
}

.contact-list li strong {
  font-family: var(--font-body);
  font-weight: 800;
  letter-spacing: 0;
  text-align: right;
  word-break: break-all;
}

.contact-list__note {
  display: block !important;
  color: var(--muted);
  font-size: 0.85rem !important;
  font-weight: 600;
  background: transparent !important;
  padding-left: 0.2rem !important;
}

.modal__copy {
  width: 100%;
}

/* —— Automatic registration（新增区块，不影响原有样式） —— */
.product-extra {
  background:
    linear-gradient(180deg, rgba(14, 143, 159, 0.06), transparent 28%),
    var(--paper);
  border-top: 1px solid var(--line);
}

.product-pill {
  max-width: var(--max);
  margin: 0 auto 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.product-pill span {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--white);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--ink-soft);
}

.pricing-strip {
  max-width: var(--max);
  margin: 2rem auto 0;
  padding: 1.35rem 1.4rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--white);
}

.pricing-strip h3 {
  margin: 0 0 0.85rem;
  font-size: 1.15rem;
  font-weight: 800;
}

.pricing-strip ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

@media (min-width: 720px) {
  .pricing-strip ul {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1020px) {
  .pricing-strip ul {
    grid-template-columns: repeat(4, 1fr);
  }
}

.pricing-strip li {
  margin: 0;
  padding: 0.75rem 0.85rem;
  border-radius: 12px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.pricing-strip li strong {
  display: block;
  color: var(--ink);
  font-size: 1rem;
  margin-bottom: 0.2rem;
}

.pricing-strip__note {
  margin: 0.9rem 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.product-extra .section-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}