:root {
  --accent: #fe2c55;
  --accent-dark: #d91f46;
  --cyan: #20d5ec;
  --cyan-dark: #089db0;
  --ink: #16181d;
  --text: #252a32;
  --muted: #667085;
  --line: #e6e9ef;
  --soft: #f6f8fb;
  --white: #ffffff;
  --surface: #ffffff;
  --shadow: 0 18px 48px rgba(18, 24, 38, 0.1);
  --radius: 8px;
  --max: 1120px;
  --font: "Segoe UI", "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--soft);
  line-height: 1.7;
  padding-bottom: 86px;
}

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

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: min(100% - 32px, var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.logo:hover {
  color: var(--accent);
  text-decoration: none;
}

.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  object-fit: cover;
  box-shadow: 0 6px 16px rgba(254, 44, 85, 0.16);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 18px;
}

.nav a {
  color: var(--muted);
  font-size: 0.95rem;
  text-decoration: none;
}

.nav a:hover,
.nav a.active {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-header.nav-open .nav-toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header.nav-open .nav-toggle span:nth-child(2) {
  opacity: 0;
}

.site-header.nav-open .nav-toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-weight: 750;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
  box-shadow: 0 12px 26px rgba(254, 44, 85, 0.28);
}

.btn-primary:hover {
  background: var(--accent-dark);
  color: var(--white);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.92);
  color: var(--ink);
  border-color: rgba(255, 255, 255, 0.66);
}

.btn-secondary:hover {
  color: var(--accent);
  background: var(--white);
}

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

.btn-dark:hover {
  background: #000;
  color: var(--white);
}

.btn-lg {
  min-height: 50px;
  padding-inline: 26px;
  font-size: 1.05rem;
}

.hero {
  position: relative;
  overflow: hidden;
  color: var(--white);
  background-color: #101216;
  background-image:
    linear-gradient(90deg, #101216 0%, #101216 48%, rgba(16, 18, 22, 0.78) 66%, rgba(16, 18, 22, 0.08) 100%),
    url("../img/cover.png");
  background-repeat: no-repeat;
  background-size: auto, min(48vw, 640px) min(48vw, 640px);
  background-position: center, right 72px center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.hero-inner {
  min-height: min(720px, calc(100svh - 116px));
  padding: 86px 0 76px;
  display: flex;
  align-items: center;
}

.hero-copy {
  max-width: 650px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 6px 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  color: #e9fbff;
  font-size: 0.88rem;
  font-weight: 700;
}

.hero h1 {
  margin: 0 0 16px;
  max-width: 13em;
  color: #fff;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.12;
  letter-spacing: 0;
}

.hero-lead {
  margin: 0 0 24px;
  max-width: 42em;
  color: rgba(255, 255, 255, 0.86);
  font-size: 1.08rem;
}

.hero-actions,
.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.94rem;
}

.trust-list li {
  position: relative;
  padding-left: 16px;
}

.trust-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  transform: translateY(-50%);
}

.section {
  padding: 64px 0;
}

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

.section-head {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-head.center {
  margin-inline: auto;
  text-align: center;
}

.section-head h2 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: clamp(1.45rem, 2.5vw, 2rem);
  line-height: 1.25;
  letter-spacing: 0;
}

.section-head p,
.muted {
  margin: 0;
  color: var(--muted);
}

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: 20px;
}

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

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card,
.shot-card,
.keyword-box,
.flow-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(18, 24, 38, 0.04);
}

.card {
  padding: 22px;
}

.card h3 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 1.08rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.card-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  margin-bottom: 14px;
  border-radius: 8px;
  color: var(--accent);
  background: #fff0f3;
  font-weight: 850;
}

.feature-row {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 34px;
  align-items: center;
}

.feature-row + .feature-row {
  margin-top: 46px;
}

.feature-row.reverse {
  grid-template-columns: 1.1fr 0.9fr;
}

.feature-row.reverse .feature-copy {
  order: 2;
}

.feature-row.reverse .feature-media {
  order: 1;
}

.feature-copy h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 1.4rem;
  line-height: 1.3;
}

.feature-copy p {
  margin: 0 0 14px;
  color: var(--muted);
}

.feature-copy ul,
.tip-list {
  margin: 0;
  padding-left: 1.15em;
  color: var(--muted);
}

.feature-copy li + li,
.tip-list li + li {
  margin-top: 6px;
}

.feature-media,
.shot-card figure,
.guide-shot {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f1f4f8;
}

.feature-media {
  box-shadow: var(--shadow);
}

.feature-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: left top;
}

.steps {
  display: grid;
  gap: 16px;
}

.step {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.step-num {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--ink);
  color: var(--white);
  font-weight: 850;
}

.step h3 {
  margin: 3px 0 6px;
  color: var(--ink);
  font-size: 1.05rem;
}

.step p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.flow-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.flow-card {
  overflow: hidden;
}

.flow-card-body {
  padding: 20px 22px;
}

.flow-card h3 {
  margin: 0 0 8px;
  color: var(--ink);
}

.flow-card p {
  margin: 0;
  color: var(--muted);
}

.flow-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: left top;
  border-top: 1px solid var(--line);
}

.page-hero {
  padding: 34px 0 22px;
}

.page-hero h1 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  line-height: 1.22;
  letter-spacing: 0;
}

.page-hero p {
  margin: 0;
  max-width: 50em;
  color: var(--muted);
}

.breadcrumb {
  padding-top: 18px;
  color: var(--muted);
  font-size: 0.9rem;
}

.breadcrumb a {
  color: var(--muted);
}

.guide-steps {
  display: grid;
  gap: 28px;
}

.guide-step {
  display: grid;
  gap: 18px;
  padding: 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.guide-step-copy {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.guide-step-copy h2,
.guide-step-copy h3 {
  margin: 2px 0 8px;
  color: var(--ink);
  font-size: 1.16rem;
}

.guide-step-copy p {
  margin: 0 0 12px;
  color: var(--muted);
}

.guide-shot {
  margin: 0;
}

.guide-shot img {
  width: 100%;
  max-height: 760px;
  object-fit: contain;
  background: #f8fafc;
}

.guide-shot figcaption {
  padding: 10px 14px;
  color: var(--muted);
  background: var(--white);
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}

.guide-pair {
  display: grid;
  grid-template-columns: minmax(240px, 0.9fr) minmax(0, 1.1fr);
  gap: 18px;
}

.keyword-box {
  padding: 22px;
}

.keyword-box h3 {
  margin: 0 0 12px;
  color: var(--ink);
}

.keyword-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.keyword-tags li {
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--white);
  color: var(--muted);
  font-size: 0.9rem;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
  font-size: 0.95rem;
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #f0fbfd;
  color: var(--cyan-dark);
  font-weight: 800;
}

tr:last-child td {
  border-bottom: 0;
}

.faq details {
  margin-bottom: 10px;
  padding: 15px 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.faq summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 750;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  float: right;
  color: var(--accent);
  font-weight: 850;
}

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

.faq details p {
  margin: 12px 0 4px;
  color: var(--muted);
}

.cta-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 34px 28px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--white);
  box-shadow: var(--shadow);
}

.cta-band h2 {
  margin: 0 0 8px;
  color: var(--white);
  font-size: 1.45rem;
  line-height: 1.3;
}

.cta-band p {
  margin: 0;
  max-width: 42em;
  color: rgba(255, 255, 255, 0.78);
}

.cta-band a:not(.btn) {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.notice {
  margin: 18px 0 0;
  padding: 14px 16px;
  border: 1px solid #cfeff5;
  border-radius: 8px;
  background: #eefcff;
  color: #255866;
  font-size: 0.94rem;
}

.disclaimer {
  display: grid;
  gap: 16px;
}

.disclaimer .card h2 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 1.15rem;
}

.disclaimer .card p {
  margin: 0 0 10px;
  color: var(--muted);
}

.disclaimer .card p:last-child {
  margin-bottom: 0;
}

.site-footer {
  padding: 48px 0 28px;
  background: #101216;
  color: #d7dce4;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 28px;
}

.footer-brand {
  margin-bottom: 10px;
  color: #fff;
  font-weight: 850;
  font-size: 1.1rem;
}

.footer-note {
  margin: 0 0 10px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.9rem;
}

.site-footer h3 {
  margin: 0 0 12px;
  color: #fff;
  font-size: 1rem;
}

.site-footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer li + li {
  margin-top: 8px;
}

.site-footer a {
  color: #d8f8ff;
}

.footer-bottom {
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.85rem;
}

.float-download {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  transform: translateY(110%);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.28s ease, opacity 0.28s ease;
}

.float-download.show {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.float-inner {
  width: min(100% - 24px, 720px);
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 14px;
  border-radius: 8px;
  background: rgba(16, 18, 22, 0.94);
  color: #fff;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(10px);
}

.float-inner strong {
  display: block;
  font-size: 0.95rem;
}

.float-inner span {
  display: block;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.8rem;
}

.float-inner .btn {
  min-height: 40px;
  padding: 9px 16px;
  white-space: nowrap;
}

.download-modal-open {
  overflow: hidden;
}

.download-modal {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(16, 18, 22, 0.64);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.download-modal.is-open {
  opacity: 1;
  pointer-events: auto;
}

.download-modal__panel {
  position: relative;
  width: min(100%, 440px);
  max-height: calc(100svh - 48px);
  overflow: auto;
  padding: 30px;
  border: 1px solid rgba(22, 24, 29, 0.08);
  border-radius: 8px;
  background: var(--white);
  color: var(--text);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.26);
  transform: translateY(12px) scale(0.98);
  transition: transform 0.2s ease;
}

.download-modal.is-open .download-modal__panel {
  transform: translateY(0) scale(1);
}

.download-modal__close {
  position: absolute;
  top: 12px;
  right: 12px;
  min-width: 44px;
  min-height: 36px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  color: var(--muted);
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
}

.download-modal__close:hover,
.download-modal__close:focus-visible {
  color: var(--ink);
  border-color: rgba(22, 24, 29, 0.22);
}

.download-modal__header {
  padding-right: 56px;
}

.download-modal__header h2 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 1.35rem;
  line-height: 1.28;
}

.download-modal__header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.download-modal__notice {
  display: block;
  padding: 12px 20px;
  border-radius: 999px;
  background: #f7e6b8;
  color: #b1691f;
  text-align: center;
  font-size: 0.96rem;
  font-weight: 700;
  line-height: 1.35;
}

.download-modal__qr-wrap {
  display: flex;
  justify-content: center;
  margin: 24px 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.download-modal__qr {
  width: 220px;
  height: 220px;
  border-radius: 8px;
  background: var(--white);
  object-fit: contain;
}

.download-modal__actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 18px;
}

@media (max-width: 960px) {
  .header-inner {
    flex-wrap: wrap;
    position: relative;
  }

  .nav-toggle {
    display: flex;
    margin-left: auto;
  }

  .header-cta {
    display: none;
  }

  .nav {
    display: none;
    width: 100%;
    order: 5;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 12px;
    border-top: 1px solid var(--line);
  }

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

  .nav a {
    padding: 12px 4px;
    border-bottom: 1px solid var(--line);
    font-size: 1rem;
  }

  .nav a:last-child {
    margin-top: 10px;
    padding: 12px 16px;
    border-bottom: 0;
    border-radius: 8px;
    background: var(--accent);
    color: #fff;
    text-align: center;
    font-weight: 750;
  }

  .hero {
    background-position: center, right 24px center;
    background-size: auto, min(46vw, 520px) min(46vw, 520px);
  }

  .hero-inner {
    min-height: auto;
    padding: 72px 0 64px;
  }

  .grid-3,
  .grid-4,
  .feature-row,
  .feature-row.reverse,
  .flow-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .feature-row.reverse .feature-copy,
  .feature-row.reverse .feature-media {
    order: initial;
  }

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

@media (max-width: 640px) {
  body {
    padding-bottom: 122px;
  }

  .container {
    width: min(100% - 24px, var(--max));
  }

  .hero {
    background-image:
      linear-gradient(180deg, rgba(16, 18, 22, 0.96) 0%, rgba(16, 18, 22, 0.9) 58%, rgba(16, 18, 22, 0.58) 100%),
      url("../img/cover.png");
    background-size: auto, 92vw 92vw;
    background-position: center, center bottom -112px;
  }

  .hero-inner {
    padding: 58px 0 52px;
  }

  .hero-actions,
  .inline-actions,
  .cta-band,
  .float-inner {
    align-items: stretch;
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .step,
  .guide-step-copy {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 12px;
  }

  .step-num {
    width: 42px;
    height: 42px;
  }

  .guide-step {
    padding: 16px;
  }

  .cta-band {
    text-align: center;
    padding: 28px 20px;
  }

  .float-inner {
    text-align: center;
  }

  .download-modal {
    padding: 16px;
  }

  .download-modal__panel {
    padding: 26px 20px 22px;
  }

  .download-modal__header {
    padding-right: 52px;
  }

  .download-modal__notice {
    padding: 11px 16px;
    font-size: 0.92rem;
  }

  .download-modal__actions {
    grid-template-columns: 1fr;
  }

  .download-modal__qr {
    width: 190px;
    height: 190px;
  }
}