/* GrowChat - Landing Page Stylesheet */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: #1a1a1a; background: #ffffff; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

:root {
  --ink: #1a1a1a; --ink-soft: #2d2d2d; --ink-muted: #6b6b6b; --ink-faint: #9a9a9a;
  --line: #e5e5e5; --bg: #ffffff; --bg-soft: #fafafa;
  --accent: #ff2442; --accent-dark: #d91a36; --accent-soft: #fff0f3;
  --radius-sm: 6px; --radius-md: 10px; --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.04);
  --container: 1200px;
}

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section-alt { background: var(--bg-soft); }

.h1 { font-size: 48px; font-weight: 700; line-height: 1.15; letter-spacing: -0.02em; }
.h2 { font-size: 36px; font-weight: 700; line-height: 1.2; letter-spacing: -0.015em; }
.h3 { font-size: 24px; font-weight: 600; line-height: 1.3; }
.h4 { font-size: 18px; font-weight: 600; line-height: 1.4; }
.body-lg { font-size: 18px; color: var(--ink-muted); }
.accent { color: var(--accent); }

@media (max-width: 768px) {
  .h1 { font-size: 32px; }
  .h2 { font-size: 26px; }
  .section { padding: 64px 0; }
}

/* ===== Nav: logo left, links CENTERED, CTA right ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.88);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.05);
}
.nav-inner {
  position: relative;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; color: var(--ink); flex-shrink: 0; }
.nav-logo-mark { width: 32px; height: 32px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; font-size: 14px; }
.nav-logo-mark img { width: 100%; height: 100%; object-fit: contain; border-radius: var(--radius-sm); }

/* Nav links absolutely centered in the middle */
.nav-links {
  position: absolute; left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  display: flex; align-items: center; gap: 8px;
}
.nav-link { position: relative; padding: 8px 14px; font-size: 15px; color: var(--ink-soft); font-weight: 500; border-radius: var(--radius-sm); transition: color 0.15s, background 0.15s; }
.nav-link:hover { color: var(--ink); background: var(--bg-soft); }

.nav-dropdown { position: relative; }
.nav-dropdown > .nav-link::after { content: ""; display: inline-block; width: 6px; height: 6px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg) translateY(-2px); margin-left: 6px; opacity: 0.6; }
.dropdown-menu { position: absolute; top: 100%; left: 0; min-width: 220px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-md); box-shadow: var(--shadow-lg); padding: 8px; margin-top: 8px; opacity: 0; visibility: hidden; transform: translateY(-4px); transition: opacity 0.15s, transform 0.15s, visibility 0.15s; }
.nav-dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-item { display: block; padding: 10px 14px; border-radius: var(--radius-sm); font-size: 14px; color: var(--ink-soft); transition: background 0.12s, color 0.12s; }
.dropdown-item:hover { background: var(--accent-soft); color: var(--accent-dark); }

.nav-cta { padding: 8px 20px; background: var(--accent); color: #fff; border-radius: var(--radius-sm); font-weight: 600; font-size: 15px; transition: background 0.15s; flex-shrink: 0; }
.nav-cta:hover { background: var(--accent-dark); }

.nav-toggle { display: none; width: 40px; height: 40px; align-items: center; justify-content: center; color: var(--ink); }

/* ===== Mobile ===== */
@media (max-width: 900px) {
  .nav-inner { justify-content: space-between; }
  .nav-links {
    position: static; transform: none;
    display: none; position: fixed; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line); box-shadow: var(--shadow-md);
  }
  .nav-links.open { display: flex; position: fixed; }
  .nav-link { padding: 14px 24px; border-radius: 0; }
  .dropdown-menu { position: static; box-shadow: none; border: none; padding-left: 24px; margin: 0; opacity: 1; visibility: visible; transform: none; display: none; }
  .nav-dropdown.open .dropdown-menu { display: block; }
  .nav-cta { margin: 12px 24px; text-align: center; padding: 12px; }
  .nav-toggle { display: flex; }
}

/* ===== Hero ===== */
.hero { padding: 160px 0 80px; background: linear-gradient(180deg, #fff 0%, #fff9f4 100%); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; background: var(--accent-soft); color: var(--accent-dark); border-radius: 100px; font-size: 13px; font-weight: 500; margin-bottom: 24px; }
.hero-title { margin-bottom: 20px; }
.hero-subtitle { margin-bottom: 36px; max-width: 520px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-visual { position: relative; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.hero-visual img { width: 100%; height: 100%; object-fit: cover; }

@media (max-width: 900px) {
  .hero { padding: 120px 0 48px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { order: -1; }
}

/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 28px; font-size: 15px; font-weight: 600; border-radius: var(--radius-sm); transition: background 0.15s, transform 0.1s, color 0.15s, border-color 0.15s; white-space: nowrap; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-secondary { background: #fff; color: var(--ink); border: 1.5px solid var(--line); }
.btn-secondary:hover { border-color: var(--ink); }
.btn-lg { padding: 16px 36px; font-size: 16px; }

/* ===== Section Header ===== */
.section-header { text-align: center; margin-bottom: 56px; max-width: 720px; margin-left: auto; margin-right: auto; }
.section-header .eyebrow { display: inline-block; font-size: 13px; font-weight: 600; color: var(--accent); letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 16px; }
.section-header .h2 { margin-bottom: 16px; }
.section-header .body-lg { color: var(--ink-muted); }

/* ===== Feature Grid ===== */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.feature-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 36px; transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s; }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(232,114,42,0.2); }
.feature-icon { width: 48px; height: 48px; border-radius: var(--radius-md); background: var(--accent-soft); display: flex; align-items: center; justify-content: center; margin-bottom: 20px; color: var(--accent); font-size: 22px; }
.feature-card .h4 { margin-bottom: 10px; }
.feature-card p { color: var(--ink-muted); font-size: 15px; line-height: 1.65; }

@media (max-width: 900px) { .feature-grid { grid-template-columns: 1fr; gap: 20px; } }

/* ===== Two-col ===== */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.two-col.reverse { direction: rtl; }
.two-col.reverse > * { direction: ltr; }
.two-col-image { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); }
.two-col-content .h2 { margin-bottom: 20px; }
.two-col-content p { color: var(--ink-muted); margin-bottom: 24px; }

@media (max-width: 900px) { .two-col, .two-col.reverse { grid-template-columns: 1fr; gap: 40px; direction: ltr; } }

/* ===== Pain Grid ===== */
.pain-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.pain-card { padding: 28px; border-radius: var(--radius-md); background: #fff; border: 1px solid var(--line); transition: border-color 0.15s, transform 0.15s; }
.pain-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.pain-card-num { font-size: 28px; font-weight: 700; color: var(--accent); line-height: 1; margin-bottom: 12px; opacity: 0.8; }
.pain-card .h4 { margin-bottom: 8px; font-size: 16px; }
.pain-card p { color: var(--ink-muted); font-size: 14px; line-height: 1.6; }

@media (max-width: 900px) { .pain-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .pain-grid { grid-template-columns: 1fr; } }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-question { width: 100%; display: flex; align-items: center; justify-content: space-between; padding: 22px 0; font-size: 17px; font-weight: 500; color: var(--ink); text-align: left; gap: 16px; }
.faq-chevron { width: 20px; height: 20px; flex-shrink: 0; transition: transform 0.2s; color: var(--ink-muted); }
.faq-item.open .faq-chevron { transform: rotate(180deg); color: var(--accent); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-answer-inner { padding-bottom: 22px; color: var(--ink-muted); font-size: 15px; line-height: 1.7; }
.faq-item.open .faq-answer { max-height: 300px; }

/* ===== Pricing ===== */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; align-items: stretch; }
.pricing-card { background: #fff; border: 1.5px solid var(--line); border-radius: var(--radius-lg); padding: 40px; display: flex; flex-direction: column; position: relative; transition: border-color 0.2s, box-shadow 0.2s; }
.pricing-card:hover { border-color: rgba(0,0,0,0.15); }
.pricing-card.featured { border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft), var(--shadow-md); }
.pricing-badge { position: absolute; top: -12px; right: 24px; background: var(--accent); color: #fff; font-size: 12px; font-weight: 600; padding: 4px 12px; border-radius: 100px; letter-spacing: 0.04em; }
.pricing-tier { font-size: 14px; font-weight: 600; color: var(--accent); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 8px; }
.pricing-name { font-size: 24px; font-weight: 700; margin-bottom: 6px; }
.pricing-desc { color: var(--ink-muted); font-size: 14px; margin-bottom: 24px; }
.pricing-price { display: flex; align-items: baseline; gap: 4px; margin-bottom: 28px; }
.pricing-price .amount { font-size: 44px; font-weight: 700; letter-spacing: -0.02em; }
.pricing-price .currency { font-size: 18px; font-weight: 600; }
.pricing-price .period { font-size: 14px; color: var(--ink-muted); }
.pricing-features { list-style: none; flex: 1; margin-bottom: 28px; }
.pricing-features li { display: flex; gap: 10px; padding: 10px 0; font-size: 14px; color: var(--ink-soft); border-bottom: 1px solid var(--line); }
.pricing-features li:last-child { border-bottom: none; }
.pricing-features .check { flex-shrink: 0; width: 18px; height: 18px; color: var(--accent); margin-top: 2px; }
.pricing-card .btn { width: 100%; }

@media (max-width: 900px) { .pricing-grid { grid-template-columns: 1fr; } }

/* ===== CTA Banner ===== */
.cta-banner { background: var(--ink); border-radius: var(--radius-lg); padding: 72px; text-align: center; color: #fff; position: relative; overflow: hidden; }
.cta-banner::before { content: ""; position: absolute; top: -120px; right: -120px; width: 360px; height: 360px; background: var(--accent); border-radius: 50%; opacity: 0.15; filter: blur(40px); }
.cta-banner .h2 { color: #fff; margin-bottom: 16px; }
.cta-banner p { color: rgba(255,255,255,0.7); margin-bottom: 32px; }
.cta-banner .btn-primary { background: var(--accent); }
.cta-banner .btn-secondary { background: transparent; color: #fff; border-color: rgba(255,255,255,0.3); }
.cta-banner .btn-secondary:hover { border-color: #fff; }

/* ===== Footer ===== */
.footer { border-top: 1px solid var(--line); padding: 64px 0 32px; background: var(--bg); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand p { font-size: 14px; color: var(--ink-muted); max-width: 300px; margin-top: 16px; }
.footer-col h4 { font-size: 14px; font-weight: 600; margin-bottom: 16px; color: var(--ink); }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { font-size: 14px; color: var(--ink-muted); transition: color 0.12s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--line); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--ink-faint); }

@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; } .footer-bottom { flex-direction: column; gap: 8px; text-align: center; } }
@media (max-width: 520px) { .footer-grid { grid-template-columns: 1fr; } }

/* ===== Page Hero ===== */
.page-hero { padding: 140px 0 64px; background: linear-gradient(180deg, #fff 0%, #fff9f4 100%); text-align: center; }
.page-hero .h1 { margin-bottom: 16px; }
.page-hero .body-lg { max-width: 600px; margin: 0 auto; }

/* ===== Stats ===== */
.stats-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; padding: 48px 0; }
.stat-item { text-align: center; }
.stat-num { font-size: 42px; font-weight: 700; color: var(--accent); letter-spacing: -0.02em; line-height: 1.1; }
.stat-label { font-size: 14px; color: var(--ink-muted); margin-top: 6px; }

@media (max-width: 768px) { .stats-strip { grid-template-columns: repeat(2, 1fr); } }

/* ===== Image Frame ===== */
.img-frame { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); }
.img-frame img { width: 100%; height: auto; display: block; }

/* ===== ODE Feature Rows ===== */
.ode-feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; padding: 48px 0; }
.ode-feature-row.reverse { direction: rtl; }
.ode-feature-row.reverse > * { direction: ltr; }
.ode-feature-row .h3 { margin-bottom: 12px; color: var(--ink); }
.ode-feature-row p { color: var(--ink-muted); margin-bottom: 16px; }
.ode-feature-row ul { list-style: none; }
.ode-feature-row ul li { position: relative; padding-left: 24px; margin-bottom: 8px; font-size: 15px; color: var(--ink-soft); }
.ode-feature-row ul li::before { content: ""; position: absolute; left: 0; top: 9px; width: 8px; height: 8px; background: var(--accent); border-radius: 50%; }
.ode-feature-image { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); }
.ode-feature-image img { width: 100%; height: 100%; object-fit: cover; }

@media (max-width: 900px) { .ode-feature-row, .ode-feature-row.reverse { grid-template-columns: 1fr; gap: 32px; direction: ltr; } }

/* ===== About ===== */
.about-story { max-width: 720px; margin: 0 auto 64px; text-align: center; }
.about-story p { color: var(--ink-muted); font-size: 17px; line-height: 1.8; margin-bottom: 16px; }
.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.value-card { padding: 36px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: #fff; }
.value-num { font-size: 13px; font-weight: 700; color: var(--accent); letter-spacing: 0.08em; margin-bottom: 10px; }
.value-card .h4 { margin-bottom: 12px; }
.value-card p { color: var(--ink-muted); font-size: 15px; line-height: 1.65; }

@media (max-width: 900px) { .values-grid { grid-template-columns: 1fr; } }

/* ===== Utility ===== */
.text-center { text-align: center; }
.mt-24 { margin-top: 24px; } .mt-32 { margin-top: 32px; } .mt-48 { margin-top: 48px; } .mt-64 { margin-top: 64px; }
.mb-24 { margin-bottom: 24px; } .mb-32 { margin-bottom: 32px; } .mb-48 { margin-bottom: 48px; }

@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.reveal { opacity: 0; animation: fadeUp 0.6s ease forwards; }
.reveal-delay-1 { animation-delay: 0.1s; } .reveal-delay-2 { animation-delay: 0.2s; } .reveal-delay-3 { animation-delay: 0.3s; } .reveal-delay-4 { animation-delay: 0.4s; }

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