:root {
  --deep: #0F1A2B;
  --deep-2: #16243A;
  --deep-3: #1C2C45;
  --lemon: #D8F35A;
  --snow: #F7FAF6;
  --fog: #97A6BC;
  --edge: rgba(216, 243, 90, 0.16);
  --shell: 1140px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    linear-gradient(90deg, transparent 0 74%, rgba(216, 243, 90, 0.05) 74% 74.2%, transparent 74.2%),
    linear-gradient(180deg, #0F1A2B, #0C1522 68%, #0F1A2B);
  color: var(--snow);
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.76;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3 { margin: 0; line-height: 1.28; font-weight: 800; }

.page-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(15, 26, 43, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--edge);
}

.nav-shell {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 3px;
  object-fit: cover;
  border: 1px solid var(--edge);
}

.primary-nav { margin-left: auto; }

.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14.5px;
  color: var(--fog);
}

.primary-nav a {
  display: inline-block;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}

.primary-nav a:hover {
  color: var(--lemon);
  border-bottom-color: var(--lemon);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 3px;
  background: var(--lemon);
  color: #121B0A;
  font-size: 14.5px;
  font-weight: 800;
}

.nav-download svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.nav-download:hover { background: #E6FF79; }

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--edge);
  border-radius: 3px;
  background: var(--deep-2);
  cursor: pointer;
  padding: 0;
}

.menu-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  margin: 3px auto;
  background: var(--snow);
}

/* ---------- hero ---------- */
.hero {
  padding: 54px 0 48px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 42px;
  align-items: center;
}

.hero-kicker {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  font-weight: 700;
  color: var(--lemon);
  border-left: 3px solid var(--lemon);
  padding: 1px 0 1px 10px;
}

.hero h1 {
  margin: 16px 0 10px;
  font-size: clamp(33px, 4.6vw, 54px);
  letter-spacing: 0.05em;
}

.hero-subtitle {
  font-size: clamp(16px, 1.85vw, 20px);
  font-weight: 700;
  color: var(--lemon);
}

.hero-lead {
  margin-top: 16px;
  max-width: 470px;
  color: var(--fog);
  font-size: 15.5px;
}

.hero-actions {
  margin-top: 26px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border-radius: 3px;
  font-weight: 800;
  font-size: 15.5px;
  transition: transform 0.18s ease;
}

.button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.button-primary {
  background: var(--lemon);
  color: #121B0A;
  box-shadow: 6px 6px 0 rgba(216, 243, 90, 0.18);
}

.button-primary:hover { transform: translate(-2px, -2px); }

.button-large { padding: 15px 30px; font-size: 16.5px; }

.text-link {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--fog);
  border-bottom: 1px dashed rgba(247, 250, 246, 0.26);
  padding-bottom: 2px;
}

.text-link:hover { color: var(--lemon); }

.hero-tags {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12.5px;
  color: var(--fog);
}

.hero-tags li {
  padding: 4px 11px;
  border: 1px solid var(--edge);
  background: rgba(216, 243, 90, 0.05);
}

.hero-tags b { color: var(--lemon); }

/* ---------- hero compare table ---------- */
.compare-wrap {
  border: 1px solid var(--edge);
  background: linear-gradient(160deg, #17253B, #101C2E);
  padding: 16px;
  box-shadow: 14px 14px 0 rgba(216, 243, 90, 0.07);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
  font-size: 12.5px;
}

.compare-table caption {
  caption-side: top;
  text-align: left;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--lemon);
  padding-bottom: 10px;
}

.compare-table th,
.compare-table td {
  padding: 9px 8px;
  text-align: left;
  vertical-align: top;
  line-height: 1.6;
  border-bottom: 1px solid rgba(247, 250, 246, 0.08);
  word-break: break-word;
}

.compare-table thead th {
  font-size: 11.5px;
  color: var(--fog);
  font-weight: 700;
  border-bottom: 1px solid var(--edge);
  white-space: nowrap;
}

.compare-table tbody th {
  font-weight: 700;
  color: var(--snow);
  font-size: 12px;
}

.compare-table tbody td { color: var(--fog); }

.compare-table tbody td:nth-child(2) { color: #E9F3D2; }

.compare-table tbody td:last-child {
  color: var(--lemon);
  font-weight: 700;
}

.compare-table tr:last-child th,
.compare-table tr:last-child td { border-bottom: 0; }

.mark {
  display: inline-block;
  width: 14px;
  height: 14px;
  line-height: 14px;
  text-align: center;
  font-size: 10px;
  margin-right: 4px;
  border-radius: 2px;
}

.mark.yes { background: var(--lemon); color: #121B0A; }
.mark.no { background: rgba(247, 250, 246, 0.12); color: #C9D4E3; }

.compare-foot {
  margin-top: 10px;
  padding-top: 9px;
  border-top: 1px dashed rgba(247, 250, 246, 0.12);
  font-size: 11.5px;
  color: var(--fog);
}

/* ---------- section shared ---------- */
section { padding: 50px 0; }

.section-heading {
  max-width: 660px;
  margin-bottom: 26px;
}

.section-heading .eyebrow {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--lemon);
  margin-bottom: 9px;
}

.section-heading h2 { font-size: clamp(22px, 2.7vw, 30px); }

.section-heading p:last-child {
  margin-top: 9px;
  color: var(--fog);
  font-size: 14.5px;
}

.section-heading-split {
  max-width: none;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.section-heading-split > p {
  margin: 0 0 6px;
  color: var(--fog);
  font-size: 13.5px;
  white-space: nowrap;
}

/* ---------- features ---------- */
.features {
  background: #101D31;
  border-top: 1px solid var(--edge);
  border-bottom: 1px solid var(--edge);
}

.compare-cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--edge);
}

.compare-cards article {
  padding: 20px 18px 22px;
  border-right: 1px solid var(--edge);
  background: rgba(216, 243, 90, 0.02);
}

.compare-cards article:last-child { border-right: 0; }

.compare-cards article:nth-child(even) { background: rgba(216, 243, 90, 0.055); }

.card-no {
  display: block;
  font-family: "Consolas", "SFMono-Regular", monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--lemon);
  margin-bottom: 10px;
}

.compare-cards h3 {
  font-size: 16.5px;
  margin-bottom: 7px;
}

.compare-cards p {
  font-size: 13.5px;
  color: var(--fog);
}

/* ---------- shots ---------- */
.compare-shots {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.compare-shots figure {
  margin: 0;
  border: 1px solid var(--edge);
  background: #101C2E;
}

.compare-shots img {
  width: 100%;
  aspect-ratio: 581 / 930;
  object-fit: cover;
  object-position: top center;
  background: #16233A;
}

.compare-shots figcaption {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 12px 11px;
  font-size: 12.5px;
  font-weight: 700;
  border-top: 1px solid var(--edge);
}

.compare-shots figcaption b {
  font-family: "Consolas", "SFMono-Regular", monospace;
  font-size: 11px;
  color: var(--lemon);
}

.compare-shots figcaption small {
  margin-left: auto;
  font-weight: 400;
  font-size: 11px;
  color: var(--fog);
}

.sample-note {
  margin-top: 14px;
  font-size: 12.5px;
  color: var(--fog);
}

/* ---------- faq ---------- */
.faq {
  background: #0D1828;
  border-top: 1px solid var(--edge);
}

.faq-rows {
  display: grid;
  gap: 0;
  max-width: 900px;
  border-top: 1px solid var(--edge);
}

.faq-rows details {
  border-bottom: 1px solid var(--edge);
  padding: 0 14px;
}

.faq-rows details[open] { background: rgba(216, 243, 90, 0.045); }

.faq-rows summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
}

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

.faq-rows summary h3 {
  flex: 1;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--snow);
}

.faq-rows summary i {
  position: relative;
  flex: none;
  width: 20px;
  height: 20px;
  border: 1px solid var(--edge);
}

.faq-rows summary i::before,
.faq-rows summary i::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--lemon);
  transform: translate(-50%, -50%);
}

.faq-rows summary i::before { width: 9px; height: 1.5px; }
.faq-rows summary i::after { width: 1.5px; height: 9px; transition: opacity 0.2s ease; }
.faq-rows details[open] summary i::after { opacity: 0; }

.faq-rows details > p {
  padding: 0 0 16px 0;
  font-size: 14px;
  color: var(--fog);
  max-width: 780px;
}

/* ---------- reviews ---------- */
.reviews { border-top: 1px solid var(--edge); }

.note-wall {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.review-card {
  padding: 16px 17px;
  border: 1px solid var(--edge);
  background: #111E31;
  position: relative;
}

.review-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 26px;
  height: 2px;
  background: var(--lemon);
}

.review-card > p {
  font-size: 13.6px;
  color: #DCE5D9;
}

.review-meta {
  margin-top: 12px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding-top: 9px;
  border-top: 1px dashed rgba(247, 250, 246, 0.12);
  font-size: 10.5px;
  color: var(--fog);
}

.review-meta b {
  font-size: 12px;
  color: var(--lemon);
}

/* ---------- steps ---------- */
.pick-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.pick-row li {
  padding: 20px 20px 22px;
  border: 1px solid var(--edge);
  border-left: 3px solid var(--lemon);
  background: #111E31;
}

.pick-row span {
  font-family: "Consolas", "SFMono-Regular", monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--lemon);
}

.pick-row h3 {
  font-size: 17px;
  margin: 5px 0 6px;
}

.pick-row p {
  font-size: 13.6px;
  color: var(--fog);
}

/* ---------- download ---------- */
.download { padding-bottom: 62px; }

.download-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 32px;
  background:
    repeating-linear-gradient(135deg, rgba(216, 243, 90, 0.07) 0 10px, transparent 10px 20px),
    #13213A;
  border: 1px solid rgba(216, 243, 90, 0.3);
}

.download-copy { max-width: 520px; }

.download-copy .eyebrow {
  font-size: 11.5px;
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--lemon);
  margin-bottom: 8px;
}

.download-copy h2 {
  font-size: clamp(22px, 2.6vw, 29px);
  margin-bottom: 8px;
}

.download-copy p { font-size: 14.5px; color: var(--fog); }

.download-act {
  flex: none;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.download-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-size: 12px;
  color: var(--fog);
}

.download-notes li {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.download-notes li::before {
  content: "";
  width: 4px;
  height: 4px;
  background: var(--lemon);
}

/* ---------- footer ---------- */
.site-footer {
  background: #0A1220;
  border-top: 1px solid var(--edge);
  padding: 32px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr) minmax(0, 0.85fr);
  gap: 20px 30px;
  align-items: start;
}

.footer-brand strong {
  display: block;
  font-size: 17px;
  letter-spacing: 0.03em;
}

.footer-brand p {
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--fog);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 13px;
  color: var(--fog);
}

.footer-nav a:hover { color: var(--lemon); }

.footer-meta {
  font-size: 12.5px;
  color: var(--fog);
  text-align: right;
}

.disclaimer {
  grid-column: 1 / -1;
  padding-top: 15px;
  border-top: 1px solid var(--edge);
  font-size: 12px;
  line-height: 1.7;
  color: #7E8EA6;
}

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .compare-wrap { max-width: 560px; }
  .compare-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .compare-cards article:nth-child(2) { border-right: 0; }
  .compare-cards article:nth-child(1),
  .compare-cards article:nth-child(2) { border-bottom: 1px solid var(--edge); }
  .compare-shots { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .note-wall { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-meta { text-align: left; }
  .download-panel { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 900px) {
  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin-left: 0;
    display: none;
    background: #13223A;
    border-bottom: 1px solid var(--edge);
    padding: 8px 24px 14px;
  }

  .primary-nav.is-open { display: block; }

  .primary-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    font-size: 15px;
  }

  .primary-nav li { width: 100%; }

  .primary-nav a {
    display: block;
    padding: 11px 0;
    border-bottom: 1px solid rgba(247, 250, 246, 0.08);
  }

  .primary-nav a:hover { border-bottom-color: rgba(247, 250, 246, 0.08); }

  .nav-shell { position: relative; flex-wrap: wrap; }
  .primary-nav { order: 4; flex-basis: 100%; }
  .nav-actions { margin-left: auto; }
  .menu-toggle { display: block; }
  .nav-download span { display: none; }
  .nav-download { padding: 10px 12px; }
}

@media (max-width: 640px) {
  .page-shell, .nav-shell { padding-left: 18px; padding-right: 18px; }
  section { padding: 40px 0; }
  .hero { padding: 38px 0 32px; }
  .compare-cards { grid-template-columns: minmax(0, 1fr); }
  .compare-cards article { border-right: 0; border-bottom: 1px solid var(--edge); }
  .compare-cards article:last-child { border-bottom: 0; }
  .note-wall { grid-template-columns: minmax(0, 1fr); }
  .pick-row { grid-template-columns: minmax(0, 1fr); }
  .section-heading-split { flex-direction: column; align-items: flex-start; gap: 6px; }
  .section-heading-split > p { white-space: normal; }
  .download-panel { padding: 24px 18px; }
  .download-act { width: 100%; }
  .download-act .button { width: 100%; justify-content: center; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 560px) {
  .compare-table { font-size: 11.5px; }
  .compare-table th, .compare-table td { padding: 8px 6px; }
  .compare-table th:last-child,
  .compare-table td:last-child { display: none; }
  .compare-table thead th { white-space: normal; }
}

@media (max-width: 400px) {
  .compare-shots { grid-template-columns: minmax(0, 1fr); }
  .brand span { font-size: 15px; }
  .hero h1 { letter-spacing: 0.02em; }
  .compare-wrap { padding: 12px; }
}