:root {
  --mist: #eff3ee;
  --mist-2: #e2e9e1;
  --white: #ffffff;
  --ink: #16302a;
  --ink-soft: #2c4a42;
  --muted: #5b6f68;
  --mint: #2fe3a8;
  --mint-deep: #12a97a;
  --line: rgba(22, 48, 42, 0.14);
  --shell: 1140px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--mist);
  color: var(--ink);
  font-family: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", 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: 1.32; font-weight: 700; }

.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: var(--ink);
  border-bottom: 1px solid rgba(47, 227, 168, 0.24);
}

.nav-shell {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 11px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: relative;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: #eaf6f1;
  font-weight: 700;
  white-space: nowrap;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid rgba(47, 227, 168, 0.4);
}

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

.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
  color: rgba(234, 246, 241, 0.68);
}

.primary-nav a {
  display: inline-block;
  padding: 4px 0;
  transition: color 0.18s ease;
}

.primary-nav a:hover { color: var(--mint); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-download {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 16px;
  border-radius: 8px;
  background: var(--mint);
  color: #0b241d;
  font-size: 14px;
  font-weight: 800;
  transition: box-shadow 0.18s ease;
}

.nav-download:hover { box-shadow: 0 0 0 4px rgba(47, 227, 168, 0.22); }

.nav-download svg,
.button svg,
.rail-btn svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: none;
}

.menu-toggle {
  display: none;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(234, 246, 241, 0.24);
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  padding: 0;
}

.menu-toggle span {
  display: block;
  width: 15px;
  height: 2px;
  margin: 3px auto;
  border-radius: 2px;
  background: #eaf6f1;
}

/* ---------- hero ---------- */
.hero {
  padding: 54px 0 48px;
  background:
    radial-gradient(620px 320px at 6% 0%, rgba(47, 227, 168, 0.16), transparent 62%),
    var(--mist);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.95fr);
  gap: 42px;
  align-items: center;
}

.hero-kicker {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 6px;
  background: var(--ink);
  color: var(--mint);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.hero h1 {
  margin: 14px 0 8px;
  font-size: clamp(32px, 4.4vw, 50px);
  letter-spacing: 0.01em;
}

.hero-subtitle {
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 700;
  color: var(--mint-deep);
}

.hero-lead {
  margin-top: 15px;
  max-width: 480px;
  color: var(--muted);
  font-size: 15px;
}

.hero-actions {
  margin-top: 24px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 22px;
  border-radius: 9px;
  font-weight: 800;
  font-size: 15px;
  transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.button-primary {
  background: var(--ink);
  color: var(--mint);
  box-shadow: 0 12px 26px rgba(22, 48, 42, 0.24);
}

.button-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 30px rgba(22, 48, 42, 0.3);
}

.button-large { padding: 14px 26px; font-size: 15.5px; }

.text-link {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-soft);
  border-bottom: 1px dashed rgba(22, 48, 42, 0.34);
  padding-bottom: 2px;
}

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

.hero-tags {
  margin-top: 25px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12.5px;
  color: var(--muted);
}

.hero-tags li {
  padding: 4px 11px;
  border-radius: 6px;
  background: var(--white);
  border: 1px solid var(--line);
}

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

/* ---------- hero tool rail ---------- */
.tool-rail {
  display: flex;
  align-items: stretch;
  gap: 14px;
  padding: 16px 18px;
  border-radius: 16px;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 20px 40px rgba(22, 48, 42, 0.12);
}

.rail-track {
  position: relative;
  flex: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  padding: 4px 0;
}

.rail-track::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 26px;
  bottom: 26px;
  width: 1px;
  background: repeating-linear-gradient(180deg, rgba(22, 48, 42, 0.24) 0 4px, transparent 4px 8px);
  transform: translateX(-50%);
}

.rail-btn {
  position: relative;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--mist);
  border: 1px solid var(--line);
  color: var(--ink);
}

.rail-btn-a { background: var(--ink); border-color: var(--ink); color: var(--mint); }

.rail-btn svg { width: 19px; height: 19px; }

.rail-note { min-width: 0; }

.rail-eyebrow {
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--mint-deep);
  margin-bottom: 5px;
}

.rail-note b {
  display: block;
  font-size: 15.5px;
  margin-bottom: 6px;
}

.rail-note > p {
  font-size: 12.8px;
  color: var(--muted);
}

.rail-list {
  margin-top: 12px;
  display: grid;
  gap: 7px;
  border-top: 1px dashed var(--line);
  padding-top: 11px;
  font-size: 12.4px;
  color: var(--muted);
}

.rail-list li { display: flex; gap: 8px; align-items: baseline; }

.rail-list span {
  flex: none;
  font-weight: 800;
  color: var(--ink);
}

/* ---------- 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: 0.16em;
  font-weight: 800;
  color: var(--mint-deep);
  margin-bottom: 9px;
}

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

.section-heading p:last-child {
  margin-top: 9px;
  color: var(--muted);
  font-size: 14px;
}

.section-heading-split {
  max-width: none;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 22px;
}

.section-heading-split > p {
  margin: 0 0 5px;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

/* ---------- features ---------- */
.features {
  background: var(--white);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

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

.rail-grid article {
  position: relative;
  padding: 20px 18px 22px;
  border-radius: 12px;
  background: var(--mist);
  border: 1px solid var(--line);
}

.rail-grid article::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 0;
  width: 34px;
  height: 3px;
  background: var(--mint);
}

.rail-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--ink);
  background: rgba(47, 227, 168, 0.24);
  border-radius: 4px;
  padding: 2px 8px;
  margin-bottom: 9px;
}

.rail-grid h3 { font-size: 16.5px; margin-bottom: 6px; }

.rail-grid p { font-size: 13.4px; color: var(--muted); }

/* ---------- shots ---------- */
.rail-shots {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 13px;
}

.rail-shots figure {
  margin: 0;
  border-radius: 12px;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
}

.rail-shots img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top center;
  background: var(--mist-2);
}

.rail-shots figcaption {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 9px 12px 11px;
  font-size: 12.5px;
  font-weight: 700;
}

.rail-shots figcaption b { font-size: 10.5px; color: var(--mint-deep); }

.rail-shots figcaption small {
  margin-left: auto;
  font-weight: 400;
  font-size: 10.5px;
  color: var(--muted);
}

.sample-note {
  margin-top: 14px;
  font-size: 12px;
  color: var(--muted);
}

/* ---------- faq ---------- */
.faq {
  background: var(--ink);
  color: #eaf6f1;
}

.faq .section-heading h2 { color: #f2fbf7; }

.faq .section-heading p:last-child { color: rgba(234, 246, 241, 0.62); }

.faq .section-heading .eyebrow { color: var(--mint); }

.faq-rows {
  display: grid;
  gap: 8px;
  max-width: 900px;
}

.faq-rows details {
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(47, 227, 168, 0.18);
  padding: 0 18px;
}

.faq-rows details[open] { border-color: rgba(47, 227, 168, 0.5); }

.faq-rows summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 0;
  cursor: pointer;
  list-style: none;
}

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

.faq-rows summary h3 { flex: 1; font-size: 15px; color: #f2fbf7; }

.faq-rows summary i {
  position: relative;
  flex: none;
  width: 20px;
  height: 20px;
  border-radius: 5px;
  background: rgba(47, 227, 168, 0.18);
}

.faq-rows summary i::before,
.faq-rows summary i::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--mint);
  border-radius: 2px;
  transform: translate(-50%, -50%);
}

.faq-rows summary i::before { width: 9px; height: 2px; }
.faq-rows summary i::after { width: 2px; height: 9px; transition: opacity 0.2s ease; }
.faq-rows details[open] summary i::after { opacity: 0; }

.faq-rows details > p {
  padding: 11px 0 14px;
  border-top: 1px dashed rgba(47, 227, 168, 0.22);
  font-size: 13.8px;
  color: rgba(234, 246, 241, 0.74);
}

/* ---------- reviews ---------- */
.reviews { background: var(--mist-2); }

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

.review-card {
  padding: 16px 17px 14px;
  border-radius: 10px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--mint);
}

.review-card > p { font-size: 13.6px; color: var(--ink-soft); }

.review-meta {
  margin-top: 11px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding-top: 9px;
  border-top: 1px dashed var(--line);
  font-size: 10.5px;
  color: var(--muted);
}

.review-meta b { font-size: 11.5px; color: var(--mint-deep); }

/* ---------- steps ---------- */
.steps { background: var(--mist); }

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

.pick-row li {
  padding: 20px 19px 22px;
  border-radius: 12px;
  background: var(--white);
  border: 1px solid var(--line);
}

.pick-row span {
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--mint-deep);
}

.pick-row h3 { font-size: 16.5px; margin: 5px 0 4px; }

.pick-row p { font-size: 13.4px; color: var(--muted); }

/* ---------- download ---------- */
.download { padding-bottom: 60px; background: var(--mist); }

.download-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding: 32px;
  border-radius: 16px;
  background:
    radial-gradient(360px 200px at 92% 6%, rgba(47, 227, 168, 0.26), transparent 68%),
    var(--ink);
  color: #eaf6f1;
}

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

.download-copy .eyebrow {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  font-weight: 800;
  color: var(--mint);
  margin-bottom: 8px;
}

.download-copy h2 {
  font-size: clamp(22px, 2.6vw, 29px);
  margin-bottom: 7px;
}

.download-copy p { font-size: 14px; color: rgba(234, 246, 241, 0.72); }

.download-act {
  flex: none;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 11px;
}

.download-act .button-primary {
  background: var(--mint);
  color: #0b241d;
  box-shadow: 0 12px 24px rgba(47, 227, 168, 0.22);
}

.download-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 5px 13px;
  font-size: 11.5px;
  color: rgba(234, 246, 241, 0.66);
}

.download-notes li::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-right: 5px;
  border-radius: 50%;
  background: var(--mint);
  vertical-align: 1px;
}

/* ---------- footer ---------- */
.site-footer {
  background: #0e211c;
  color: #dcece5;
  padding: 30px 0 26px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr) minmax(0, 0.8fr);
  gap: 20px 28px;
  align-items: start;
}

.footer-brand strong { display: block; font-size: 16.5px; }

.footer-brand p {
  margin-top: 5px;
  font-size: 12px;
  color: rgba(220, 236, 229, 0.6);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 16px;
  font-size: 12.5px;
  color: rgba(220, 236, 229, 0.74);
}

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

.footer-meta {
  font-size: 12px;
  color: rgba(220, 236, 229, 0.6);
  text-align: right;
}

.footer-meta a { text-decoration: underline; }

.disclaimer {
  grid-column: 1 / -1;
  padding-top: 14px;
  border-top: 1px solid rgba(220, 236, 229, 0.14);
  font-size: 11.5px;
  line-height: 1.7;
  color: rgba(220, 236, 229, 0.55);
}

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .tool-rail { max-width: 520px; }
  .rail-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rail-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: var(--ink);
    border-bottom: 1px solid rgba(47, 227, 168, 0.24);
    padding: 8px 24px 14px;
  }

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

  .primary-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    font-size: 14.5px;
  }

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

  .primary-nav a {
    display: block;
    padding: 10px 0;
    border-bottom: 1px solid rgba(47, 227, 168, 0.16);
  }

  .nav-actions { margin-left: auto; }
  .menu-toggle { display: block; }
  .nav-download span { display: none; }
  .nav-download { padding: 9px 11px; }
}

@media (max-width: 640px) {
  .page-shell, .nav-shell { padding-left: 18px; padding-right: 18px; }
  section { padding: 40px 0; }
  .hero { padding: 38px 0 32px; }
  .rail-grid { grid-template-columns: minmax(0, 1fr); }
  .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: 4px; }
  .section-heading-split > p { white-space: normal; }
  .download-panel { padding: 24px 20px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .download-act { width: 100%; }
  .download-act .button { width: 100%; justify-content: center; }
  .tool-rail { padding: 14px; gap: 12px; }
}

@media (max-width: 400px) {
  .rail-shots { grid-template-columns: minmax(0, 1fr); }
  .brand span { font-size: 15px; }
  .rail-btn { width: 38px; height: 38px; }
  .hero h1 { font-size: 30px; }
}