:root {
  --ink: #10243a;
  --ink-soft: #294056;
  --muted: #66788a;
  --navy: #0b2138;
  --navy-light: #163b58;
  --blue: #1676b9;
  --blue-dark: #0c568c;
  --blue-soft: #e9f4fb;
  --green: #18a47a;
  --green-dark: #0f795a;
  --green-soft: #e8f7f1;
  --aqua: #70dec1;
  --line: #dce6ed;
  --line-soft: #edf2f5;
  --paper: #ffffff;
  --wash: #f4f8fa;
  --warm: #fff7e8;
  --shadow-sm: 0 10px 30px rgba(16, 36, 58, 0.07);
  --shadow: 0 24px 70px rgba(16, 36, 58, 0.12);
  --shadow-blue: 0 18px 45px rgba(22, 118, 185, 0.2);
  --radius-sm: 14px;
  --radius: 22px;
  --radius-lg: 32px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "SF Pro Display", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

body::selection {
  color: #fff;
  background: var(--blue);
}

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

img { max-width: 100%; }

.container {
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(220, 230, 237, 0.78);
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 6px 25px rgba(16, 36, 58, 0.025);
  backdrop-filter: blur(22px) saturate(160%);
}

.nav {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 13px;
  color: var(--navy);
  font-size: 17px;
  font-weight: 850;
  letter-spacing: -0.02em;
}

.brand-logo {
  width: 42px;
  height: 42px;
  border-radius: 13px;
  box-shadow: 0 10px 26px rgba(18, 120, 145, 0.2);
}

.brand small {
  display: block;
  margin-top: 1px;
  color: #80909e;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  color: #41556a;
  font-size: 14px;
  font-weight: 650;
}

.nav-links > a:not(.button) {
  position: relative;
  padding: 27px 0 25px;
}

.nav-links > a:not(.button)::after {
  position: absolute;
  right: 0;
  bottom: 18px;
  left: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--blue), var(--green));
  content: "";
  transform: scaleX(0);
  transition: transform 180ms ease;
}

.nav-links > a:not(.button):hover,
.nav-links > a:not(.button)[aria-current="page"] {
  color: var(--blue-dark);
}

.nav-links > a:not(.button):hover::after,
.nav-links > a:not(.button)[aria-current="page"]::after {
  transform: scaleX(1);
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 14px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #1389a5);
  box-shadow: 0 10px 25px rgba(22, 118, 185, 0.18);
  font-size: 15px;
  font-weight: 750;
  letter-spacing: 0.01em;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.button:hover {
  background: linear-gradient(135deg, var(--blue-dark), var(--green-dark));
  box-shadow: var(--shadow-blue);
  transform: translateY(-2px);
}

.button.secondary {
  border-color: #b7ccd9;
  color: var(--blue-dark);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: none;
}

.button.secondary:hover {
  border-color: var(--blue);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 112px 0 96px;
  background:
    linear-gradient(rgba(255,255,255,.72), rgba(255,255,255,.96)),
    radial-gradient(circle at 12% 12%, rgba(22,118,185,.28), transparent 32%),
    radial-gradient(circle at 88% 20%, rgba(24,164,122,.24), transparent 30%);
}

.hero::before {
  position: absolute;
  inset: 0;
  opacity: 0.48;
  background-image:
    linear-gradient(rgba(22, 118, 185, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22, 118, 185, 0.055) 1px, transparent 1px);
  background-size: 44px 44px;
  content: "";
  mask-image: linear-gradient(to bottom, #000, transparent 82%);
}

.hero::after {
  position: absolute;
  top: -170px;
  right: -130px;
  width: 430px;
  height: 430px;
  border: 1px solid rgba(22, 118, 185, 0.1);
  border-radius: 50%;
  box-shadow:
    0 0 0 50px rgba(22, 118, 185, 0.025),
    0 0 0 100px rgba(24, 164, 122, 0.02);
  content: "";
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.13fr) minmax(360px, 0.87fr);
  gap: 72px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid rgba(22, 118, 185, 0.12);
  border-radius: 999px;
  color: var(--blue-dark);
  background: rgba(233, 244, 251, 0.8);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.eyebrow::before {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(24, 164, 122, 0.1);
  content: "";
}

h1, h2, h3 {
  color: var(--navy);
  line-height: 1.22;
}

h1 {
  max-width: 820px;
  margin: 25px 0 24px;
  font-size: clamp(44px, 5.65vw, 70px);
  font-weight: 850;
  letter-spacing: -0.055em;
}

h2 { letter-spacing: -0.035em; }
h3 { letter-spacing: -0.018em; }

.hero p {
  max-width: 720px;
  margin: 0;
  color: #50677b;
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  gap: 13px;
  margin-top: 34px;
  flex-wrap: wrap;
}

.micro-copy {
  margin: 15px 0 0 !important;
  color: #83919e !important;
  font-size: 13px !important;
}

.proof-card {
  position: relative;
  overflow: hidden;
  padding: 34px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.84);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.proof-card::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--green), var(--aqua));
  content: "";
}

.proof-card h3 {
  margin: 18px 0 14px;
  font-size: 25px;
}

.proof-card > p { color: var(--muted); font-size: 15px; }
.sales-card .checklist { margin: 22px 0; }

.sales-card .checklist li {
  padding-top: 11px;
  padding-bottom: 11px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line-soft);
}

.text-link {
  display: inline-flex;
  margin-top: 5px;
  color: var(--blue-dark);
  font-weight: 800;
  transition: color 180ms ease, transform 180ms ease;
}

.text-link:hover {
  color: var(--green-dark);
  transform: translateX(3px);
}

.metric {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 16px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.metric strong { color: var(--blue); font-size: 27px; }
.metric span { color: var(--muted); font-size: 14px; }

.section {
  position: relative;
  padding: 104px 0;
}

.section.alt {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(circle at 95% 10%, rgba(24, 164, 122, 0.06), transparent 24%),
    var(--wash);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 48px;
}

.section-heading h2 {
  margin: 17px 0 15px;
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 830;
}

.section-heading p {
  max-width: 700px;
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card,
.contact-card {
  position: relative;
  overflow: hidden;
  padding: 31px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 4px 0 rgba(16, 36, 58, 0.015);
  transition: transform 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}

.card::after,
.contact-card::after {
  position: absolute;
  right: -38px;
  bottom: -52px;
  width: 110px;
  height: 110px;
  border: 1px solid rgba(22, 118, 185, 0.08);
  border-radius: 50%;
  content: "";
}

.card:hover,
.contact-card:hover {
  border-color: rgba(22, 118, 185, 0.32);
  box-shadow: var(--shadow-sm);
  transform: translateY(-5px);
}

.card h3,
.contact-card h3 {
  margin: 17px 0 11px;
  font-size: 22px;
}

.card p,
.contact-card p {
  color: var(--muted);
}

.card a {
  display: inline-flex;
  margin-top: 8px;
  color: var(--blue-dark);
}

.card.featured {
  border-color: rgba(22, 118, 185, 0.45);
  background: linear-gradient(145deg, #fff, #f0f9fb);
  box-shadow: var(--shadow);
}

.card.featured::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--green));
  content: "";
}

.icon {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border: 1px solid rgba(22, 118, 185, 0.1);
  border-radius: 15px;
  color: var(--blue-dark);
  background: linear-gradient(145deg, var(--blue-soft), var(--green-soft));
  font-size: 13px;
  font-weight: 900;
  box-shadow: inset 0 1px 0 #fff;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  counter-reset: step;
}

.step {
  position: relative;
  min-height: 210px;
  overflow: hidden;
  padding: 29px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.step::before {
  counter-increment: step;
  content: "0" counter(step);
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.step::after {
  position: absolute;
  right: -20px;
  bottom: -40px;
  color: rgba(22, 118, 185, 0.055);
  content: "0" counter(step);
  font-size: 100px;
  font-weight: 900;
  line-height: 1;
}

.step h3 { margin: 20px 0 10px; font-size: 21px; }
.step p { position: relative; z-index: 1; color: var(--muted); }

.comparison {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 20px 22px;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--navy);
  background: linear-gradient(180deg, #f4fafc, #edf6f9);
  font-size: 14px;
  letter-spacing: 0.02em;
}

td { color: #506477; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: #fbfdfe; }

.callout {
  margin-top: 34px;
  padding: 25px 27px;
  border: 1px solid rgba(24, 164, 122, 0.15);
  border-left: 4px solid var(--green);
  border-radius: var(--radius-sm);
  background: var(--green-soft);
}

.callout.warning {
  border-color: rgba(224, 164, 56, 0.2);
  border-left-color: #dfa438;
  background: var(--warm);
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding: 92px 0 76px;
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(circle at 83% 12%, rgba(24, 164, 122, 0.13), transparent 28%),
    radial-gradient(circle at 8% 100%, rgba(22, 118, 185, 0.12), transparent 30%),
    linear-gradient(145deg, #f7fafc, #fff);
}

.page-hero::after {
  position: absolute;
  top: -110px;
  right: 7%;
  width: 310px;
  height: 310px;
  border: 1px solid rgba(22, 118, 185, 0.09);
  border-radius: 50%;
  content: "";
}

.page-hero .container { position: relative; z-index: 1; }

.page-hero h1 {
  max-width: 900px;
  margin-bottom: 20px;
  font-size: clamp(38px, 5vw, 60px);
}

.page-hero p {
  max-width: 760px;
  color: var(--muted);
  font-size: 18px;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 72px;
}

.article {
  max-width: 780px;
}

.article h2 {
  position: relative;
  margin: 52px 0 17px;
  padding-left: 17px;
  font-size: 30px;
}

.article h2:first-child { margin-top: 0; }

.article h2::before {
  position: absolute;
  top: 0.19em;
  bottom: 0.16em;
  left: 0;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(var(--blue), var(--green));
  content: "";
}

.article h3 { margin-top: 30px; }
.article p, .article li { color: #4d6275; }
.article li { margin: 9px 0; }

.sidebar {
  position: sticky;
  top: 106px;
  align-self: start;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, #fff, #f6fafc);
  box-shadow: var(--shadow-sm);
}

.sidebar h3 { margin: 16px 0; font-size: 22px; }
.sidebar .button { width: 100%; margin-top: 16px; }
.sidebar p { color: var(--muted); }

.status {
  display: inline-flex;
  padding: 6px 11px;
  border: 1px solid rgba(24, 164, 122, 0.12);
  border-radius: 999px;
  color: var(--green-dark);
  background: var(--green-soft);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.05em;
}

.experiment-log {
  display: grid;
  gap: 16px;
}

.log-entry {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 25px;
  padding: 25px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 7px 22px rgba(16, 36, 58, 0.04);
}

.log-entry time {
  color: var(--blue-dark);
  font-size: 13px;
  font-weight: 850;
}

.log-entry p { margin-bottom: 0; }

.contact-panel {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 54px;
  overflow: hidden;
  padding: 54px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  color: #fff;
  background:
    radial-gradient(circle at 90% 15%, rgba(112, 222, 193, 0.2), transparent 28%),
    linear-gradient(135deg, var(--navy), #123e59);
  box-shadow: 0 28px 70px rgba(11, 33, 56, 0.2);
}

.contact-panel::after {
  position: absolute;
  right: -100px;
  bottom: -150px;
  width: 370px;
  height: 370px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 50%;
  box-shadow: 0 0 0 55px rgba(255,255,255,.025);
  content: "";
}

.contact-panel > * { position: relative; z-index: 1; }
.contact-panel h2, .contact-panel h3 { color: #fff; }
.contact-panel h2 { margin: 16px 0; font-size: clamp(29px, 3vw, 42px); }
.contact-panel p { color: #cbdce7; }

.contact-panel .eyebrow {
  border-color: rgba(112, 222, 193, 0.18);
  color: #bff2e4;
  background: rgba(112, 222, 193, 0.1);
}

.contact-quick {
  display: grid;
  gap: 14px;
  align-content: center;
}

.contact-quick > a:not(.button) {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 15px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  transition: padding 180ms ease, border-color 180ms ease;
}

.contact-quick > a:not(.button):hover {
  padding-left: 6px;
  border-color: var(--aqua);
}

.contact-quick span { color: #c8dbe6; }
.contact-panel .checklist li::before { color: var(--aqua); }

.contact-card strong {
  display: block;
  color: var(--green-dark);
  font-size: 13px;
  letter-spacing: 0.1em;
}

.contact-card a {
  display: block;
  margin-top: 7px;
  font-size: 22px;
  font-weight: 800;
}

.trust-strip {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 34px;
  color: var(--ink-soft);
  font-size: 13px;
}

.trust-strip span {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
}

.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  position: relative;
  padding: 9px 0 9px 29px;
}

.checklist li::before {
  position: absolute;
  left: 0;
  color: var(--green);
  content: "✓";
  font-weight: 900;
}

.site-footer {
  padding: 46px 0;
  color: #738393;
  border-top: 1px solid var(--line);
  background: #fbfcfd;
  font-size: 13px;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
}

.mobile-toggle { display: none; }

@media (max-width: 920px) {
  .mobile-toggle {
    display: grid;
    width: 42px;
    height: 42px;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 12px;
    color: var(--navy);
    background: #fff;
    font-size: 21px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 78px;
    right: 0;
    left: 0;
    padding: 20px 24px 26px;
    flex-direction: column;
    align-items: stretch;
    gap: 3px;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow);
  }

  .nav-links.open { display: flex; }
  .nav-links > a:not(.button) { padding: 11px 3px; }
  .nav-links > a:not(.button)::after { display: none; }
  .hero-grid, .content-grid, .contact-panel { grid-template-columns: 1fr; }
  .hero-grid { gap: 50px; }
  .grid-3 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .hero { padding: 78px 0; }
  .sidebar { position: static; }
  .content-grid { gap: 45px; }
  .contact-panel { gap: 32px; }
}

@media (max-width: 580px) {
  .container { width: min(100% - 28px, 1160px); }
  .nav { min-height: 70px; }
  .nav-links { top: 70px; }
  .brand-logo { width: 38px; height: 38px; }
  .brand small {
    max-width: 175px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
  }
  .hero { padding: 62px 0 66px; }
  .hero::after { display: none; }
  .hero-grid { gap: 38px; }
  h1 { font-size: 43px; letter-spacing: -0.045em; }
  .hero p, .page-hero p { font-size: 16px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .proof-card { padding: 27px 23px; border-radius: 24px; }
  .section { padding: 72px 0; }
  .section-heading { margin-bottom: 34px; }
  .section-heading h2 { font-size: 34px; }
  .steps { grid-template-columns: 1fr; }
  .step { min-height: auto; }
  .page-hero { padding: 65px 0 55px; }
  .page-hero h1 { font-size: 40px; }
  .article h2 { font-size: 27px; }
  .log-entry { grid-template-columns: 1fr; gap: 8px; }
  .contact-panel { padding: 34px 25px; border-radius: 25px; }
  .contact-quick > a:not(.button) { flex-direction: column; gap: 2px; }
  th, td { min-width: 180px; padding: 17px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}