/* ========== Reset & Base ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif; color: #1f2937; line-height: 1.6; background: #fff; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }

/* ========== Utilities ========== */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.highlight { color: #07C160; }
.gradient-brand { background: linear-gradient(135deg, #07C160, #165DFF); color: #fff; }

/* ========== Header ========== */
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.95); backdrop-filter: blur(12px); border-bottom: 1px solid #f0f0f0; }
.header-inner { display: flex; align-items: center; height: 64px; gap: 32px; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 700; color: #1f2937; white-space: nowrap; }
.logo-icon { width: 32px; height: 32px; border-radius: 8px; display: flex; align-items: center; justify-content: center; color: #fff; flex-shrink: 0; }
.nav-links { display: flex; gap: 28px; margin-left: auto; }
.nav-links a { font-size: 15px; color: #4b5563; transition: color .2s; white-space: nowrap; }
.nav-links a:hover, .nav-links a.active { color: #07C160; }
.header-btn { padding: 8px 20px; border-radius: 8px; font-size: 14px; font-weight: 600; white-space: nowrap; transition: opacity .2s; }
.header-btn:hover { opacity: 0.9; }
.mobile-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; margin-left: auto; }
.mobile-toggle span { display: block; width: 22px; height: 2px; background: #333; border-radius: 2px; }
.mobile-menu { display: none; flex-direction: column; background: #fff; border-top: 1px solid #f0f0f0; padding: 12px 20px; }
.mobile-menu.open { display: flex; }
.mobile-menu a { padding: 12px 0; border-bottom: 1px solid #f5f5f5; font-size: 15px; color: #4b5563; }
.mobile-cta { text-align: center; border-radius: 8px; padding: 12px; margin-top: 8px; font-weight: 600; }

/* ========== Hero ========== */
.hero { padding: 60px 0 40px; background: linear-gradient(180deg, #f0fdf4 0%, #fff 100%); }
.hero-inner { display: flex; align-items: center; gap: 48px; }
.hero-text { flex: 1; min-width: 0; }
.hero-badge { display: inline-flex; align-items: center; gap: 6px; background: rgba(7,193,96,0.08); color: #07C160; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 500; margin-bottom: 20px; }
.hero-badge svg { width: 14px; height: 14px; }
.hero h1 { font-size: 40px; font-weight: 800; line-height: 1.25; margin-bottom: 18px; color: #111; }
.hero-desc { font-size: 16px; color: #6b7280; line-height: 1.8; margin-bottom: 28px; max-width: 540px; }
.hero-btns { display: flex; gap: 14px; margin-bottom: 28px; flex-wrap: wrap; }
.btn-primary { display: inline-flex; align-items: center; gap: 6px; padding: 14px 32px; border-radius: 10px; font-size: 16px; font-weight: 600; transition: opacity .2s, transform .2s; }
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-outline { display: inline-flex; align-items: center; gap: 6px; padding: 14px 32px; border-radius: 10px; font-size: 16px; font-weight: 600; border: 2px solid #e5e7eb; color: #4b5563; transition: border-color .2s; }
.btn-outline:hover { border-color: #07C160; color: #07C160; }
.hero-checks { display: flex; gap: 20px; flex-wrap: wrap; }
.hero-checks span { display: flex; align-items: center; gap: 6px; font-size: 14px; color: #6b7280; }
.hero-checks svg { width: 16px; height: 16px; color: #07C160; }
.hero-image { flex: 1; min-width: 0; }
.hero-image img { width: 100%; border-radius: 16px; box-shadow: 0 20px 60px rgba(7,193,96,0.12); }

/* ========== Stats ========== */
.stats { padding: 32px 0; background: #fff; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-item { text-align: center; padding: 24px 16px; background: #fafafa; border-radius: 12px; }
.stat-icon svg { color: #07C160; margin: 0 auto 8px; }
.stat-value { font-size: 28px; font-weight: 800; color: #111; margin-bottom: 4px; }
.stat-label { font-size: 14px; color: #4b5563; margin-bottom: 2px; }
.stat-sub { font-size: 12px; color: #9ca3af; }

/* ========== Sections ========== */
.section { padding: 64px 0; }
.section-white { background: #fff; }
.section-gray { background: #f9fafb; }
.section-title { font-size: 28px; font-weight: 800; text-align: center; margin-bottom: 12px; color: #111; }
.section-desc { text-align: center; color: #6b7280; max-width: 640px; margin: 0 auto 40px; line-height: 1.7; }

/* ========== Features ========== */
.features-img { text-align: center; margin-bottom: 40px; }
.features-img img { max-width: 600px; margin: 0 auto; border-radius: 12px; }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card { padding: 28px; background: #fafafa; border-radius: 12px; border: 1px solid #f0f0f0; transition: box-shadow .2s, transform .2s; }
.feature-card:hover { box-shadow: 0 8px 30px rgba(0,0,0,0.06); transform: translateY(-2px); }
.feature-icon { width: 48px; height: 48px; border-radius: 10px; display: flex; align-items: center; justify-content: center; background: rgba(7,193,96,0.08); margin-bottom: 16px; }
.feature-icon svg { color: #07C160; }
.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: #111; }
.feature-card p { font-size: 14px; color: #6b7280; line-height: 1.7; }

/* ========== Process ========== */
.process-img { text-align: center; margin-bottom: 40px; }
.process-img img { max-width: 700px; margin: 0 auto; border-radius: 12px; }
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step-card { text-align: center; padding: 28px 20px; background: #fff; border-radius: 12px; border: 1px solid #f0f0f0; position: relative; }
.step-num { width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 700; margin: 0 auto 16px; color: #fff; }
.step-icon svg { color: #07C160; margin-bottom: 12px; }
.step-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; color: #111; }
.step-card p { font-size: 13px; color: #6b7280; line-height: 1.7; }

/* ========== FAQ ========== */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item { border: 1px solid #f0f0f0; border-radius: 10px; margin-bottom: 12px; overflow: hidden; background: #fafafa; }
.faq-q { width: 100%; display: flex; justify-content: space-between; align-items: center; padding: 18px 20px; font-size: 15px; font-weight: 600; color: #1f2937; text-align: left; transition: background .2s; }
.faq-q:hover { background: #f0f0f0; }
.faq-q svg { width: 18px; height: 18px; flex-shrink: 0; transition: transform .25s; color: #9ca3af; }
.faq-q.open svg { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease, padding .3s ease; padding: 0 20px; font-size: 14px; color: #6b7280; line-height: 1.8; }
.faq-a.open { max-height: 400px; padding: 0 20px 18px; }
.faq-filter { display: flex; gap: 8px; margin-bottom: 28px; flex-wrap: wrap; }
.faq-filter-btn { padding: 8px 18px; border-radius: 20px; font-size: 13px; font-weight: 500; color: #6b7280; background: #f3f4f6; transition: all .2s; }
.faq-filter-btn:hover { background: #e5e7eb; }
.faq-filter-btn.active { background: linear-gradient(135deg, #07C160, #165DFF); color: #fff; }

/* ========== CTA ========== */
.cta { padding: 64px 0; text-align: center; color: #fff; }
.cta h2 { font-size: 28px; font-weight: 800; margin-bottom: 14px; }
.cta p { max-width: 560px; margin: 0 auto 28px; font-size: 15px; opacity: 0.9; line-height: 1.7; }
.cta-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn-white { display: inline-flex; align-items: center; gap: 6px; padding: 14px 32px; border-radius: 10px; font-size: 16px; font-weight: 600; background: #fff; color: #07C160; transition: opacity .2s; }
.btn-white:hover { opacity: 0.9; }
.btn-ghost { display: inline-flex; align-items: center; gap: 6px; padding: 14px 32px; border-radius: 10px; font-size: 16px; font-weight: 600; border: 2px solid rgba(255,255,255,0.4); color: #fff; transition: border-color .2s; }
.btn-ghost:hover { border-color: #fff; }

/* ========== Footer ========== */
.site-footer { background: #111827; color: #d1d5db; padding: 48px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 32px; }
.footer-brand .logo { color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 13px; line-height: 1.7; color: #9ca3af; }
.footer-col h4 { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 14px; }
.footer-col ul li { margin-bottom: 8px; font-size: 13px; color: #9ca3af; }
.footer-col ul li a:hover { color: #07C160; }
.footer-bottom { border-top: 1px solid #1f2937; padding: 18px 0; display: flex; justify-content: space-between; font-size: 12px; color: #6b7280; flex-wrap: wrap; gap: 8px; }

/* ========== Page Banner ========== */
.page-banner { padding: 48px 0 32px; background: linear-gradient(180deg, #f0fdf4 0%, #fff 100%); }
.page-banner h1 { font-size: 32px; font-weight: 800; color: #111; margin-bottom: 12px; }
.page-banner p { font-size: 15px; color: #6b7280; line-height: 1.7; max-width: 640px; }

/* ========== Guide Steps ========== */
.guide-steps { display: flex; flex-direction: column; gap: 28px; }
.guide-step { display: flex; gap: 24px; }
.guide-step-num { width: 48px; height: 48px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 16px; font-weight: 800; color: #fff; flex-shrink: 0; }
.guide-step h3 { display: flex; align-items: center; gap: 8px; font-size: 18px; font-weight: 700; color: #111; margin-bottom: 10px; }
.guide-step h3 svg { color: #07C160; }
.guide-step p { font-size: 14px; color: #6b7280; line-height: 1.8; }
.guide-tip { margin-top: 12px; padding: 12px 16px; background: rgba(22,93,255,0.05); border: 1px solid rgba(22,93,255,0.12); border-radius: 8px; font-size: 13px; color: #4b5563; line-height: 1.7; }

/* ========== Advantage Grid ========== */
.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 32px; }
.adv-grid-4 { grid-template-columns: repeat(4, 1fr); }
.adv-card { text-align: center; padding: 28px 20px; background: #fff; border-radius: 12px; border: 1px solid #f0f0f0; }
.adv-card svg { color: #07C160; margin-bottom: 12px; }
.adv-card h4 { font-size: 16px; font-weight: 700; color: #111; margin-bottom: 8px; }
.adv-card p { font-size: 13px; color: #6b7280; line-height: 1.6; }

/* ========== Note Items ========== */
.note-item { display: flex; gap: 14px; padding: 18px; border-radius: 10px; margin-bottom: 14px; align-items: flex-start; }
.note-item svg { flex-shrink: 0; margin-top: 2px; }
.note-warn { background: #fffbeb; border: 1px solid #fef3c7; }
.note-warn svg { color: #f59e0b; }
.note-info { background: #eff6ff; border: 1px solid #dbeafe; }
.note-info svg { color: #3b82f6; }
.note-item h4 { font-size: 15px; font-weight: 600; color: #111; margin-bottom: 6px; }
.note-item p { font-size: 13px; color: #6b7280; line-height: 1.7; }

/* ========== About ========== */
.about-story { display: grid; grid-template-columns: 1fr 280px; gap: 48px; align-items: start; }
.about-stats-mini { display: flex; flex-direction: column; gap: 16px; }
.stat-mini { text-align: center; padding: 20px; background: #f9fafb; border-radius: 10px; border: 1px solid #f0f0f0; }
.stat-mini-val { font-size: 24px; font-weight: 800; margin-bottom: 4px; color: #fff; padding: 4px 0; border-radius: 6px; }
.stat-mini-label { font-size: 13px; color: #6b7280; }

.mission-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.mission-card { padding: 28px; background: #fff; border-radius: 12px; border: 1px solid #f0f0f0; }
.mission-icon { width: 56px; height: 56px; border-radius: 12px; display: flex; align-items: center; justify-content: center; background: rgba(7,193,96,0.08); margin-bottom: 16px; }
.mission-icon svg { color: #07C160; }
.mission-card h3 { font-size: 18px; font-weight: 700; color: #111; margin-bottom: 10px; }
.mission-card p { font-size: 14px; color: #6b7280; line-height: 1.8; }

.commit-list { display: flex; flex-direction: column; gap: 16px; }
.commit-item { display: flex; gap: 14px; padding: 20px; background: #fff; border-radius: 10px; border: 1px solid #f0f0f0; align-items: flex-start; font-size: 14px; color: #4b5563; line-height: 1.7; }
.commit-icon { width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: rgba(7,193,96,0.08); flex-shrink: 0; }
.commit-icon svg { color: #07C160; }
.commit-item b { color: #111; }

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .adv-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .about-story { grid-template-columns: 1fr; }
  .about-stats-mini { flex-direction: row; justify-content: center; }
}

@media (max-width: 768px) {
  .nav-links, .header-btn { display: none; }
  .mobile-toggle { display: flex; }
  .hero-inner { flex-direction: column; gap: 28px; text-align: center; }
  .hero h1 { font-size: 28px; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-btns { justify-content: center; }
  .hero-checks { justify-content: center; }
  .features-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .mission-grid { grid-template-columns: 1fr; }
  .adv-grid, .adv-grid-4 { grid-template-columns: 1fr; }
  .section { padding: 48px 0; }
  .section-title { font-size: 24px; }
  .cta h2 { font-size: 24px; }
  .page-banner h1 { font-size: 26px; }
  .guide-step { flex-direction: column; gap: 12px; }
  .guide-step-num { margin: 0 auto; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 24px; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat-item { padding: 16px 12px; }
  .stat-value { font-size: 22px; }
  .about-stats-mini { flex-direction: column; }
}