:root {
  --primary: #2F5233;
  --secondary: #C8853F;
  --accent: #D9563A;
  --bg-light: #FAF6EF;
  --bg-dark: #1A1713;
  --bg-card: #FFFFFF;
  --text-main: #26221C;
  --text-muted: #6B6359;
  --border-light: #E8E0D4;
  --gradient-brand: linear-gradient(135deg, #2F5233 0%, #C8853F 100%);
  --shadow-card: 0 8px 30px rgba(26,23,19,0.08);
  --shadow-hover: 0 16px 48px rgba(26,23,19,0.14);
  --shadow-dark: 0 8px 32px rgba(0,0,0,0.35);
  --radius-hero: 24px;
  --radius-card: 16px;
  --radius-pill: 999px;
  --radius-tag: 8px;
  --radius-input: 12px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  line-height: 1.75;
  color: var(--text-main);
  background: var(--bg-light);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; }
input, select, textarea { font-family: inherit; }

.container-custom {
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}
@media (min-width: 640px) {
  .container-custom { padding-left: 2rem; padding-right: 2rem; }
}
@media (min-width: 1024px) {
  .container-custom { padding-left: 2.5rem; padding-right: 2.5rem; }
}

.brand-gradient {
  background: var(--gradient-brand);
}
.brand-gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Navigation */
#site-nav {
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
#site-nav.nav-scrolled {
  background: rgba(26,23,19,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 24px rgba(0,0,0,0.2);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.nav-link {
  position: relative;
  color: rgba(255,255,255,0.85);
  font-weight: 500;
  font-size: 0.9375rem;
  padding: 4px 2px;
  transition: color 0.25s ease;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: 2px;
  transition: width 0.3s ease;
}
.nav-link:hover {
  color: var(--secondary);
}
.nav-link:hover::after {
  width: 100%;
}
.nav-link.active {
  color: #fff;
}
.nav-link.active::after {
  width: 100%;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-brand);
  color: #fff;
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  border: none;
  transition: all 0.25s ease;
  box-shadow: 0 4px 16px rgba(47,82,51,0.3);
}
.btn-primary:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(47,82,51,0.4);
}
.btn-primary:active {
  filter: brightness(0.95);
  transform: translateY(0);
}
.btn-primary:focus-visible {
  outline: 3px solid rgba(200,133,63,0.5);
  outline-offset: 2px;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: rgba(255,255,255,0.9);
  font-weight: 500;
  font-size: 0.9375rem;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  border: 1.5px solid rgba(255,255,255,0.4);
  transition: all 0.25s ease;
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.7);
}
.btn-secondary:active {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.5);
}
.btn-secondary:focus-visible {
  outline: 3px solid rgba(255,255,255,0.3);
  outline-offset: 2px;
}

/* Cards */
.card-hover {
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

/* Pain cards */
.pain-card {
  position: relative;
  background: var(--bg-card);
  border-radius: var(--radius-card);
  padding: 2rem 1.75rem;
  box-shadow: var(--shadow-card);
  border-left: 4px solid var(--secondary);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-left-color 0.25s ease;
}
.pain-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-left-color: var(--primary);
}
.pain-card .icon-box {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(47,82,51,0.1);
  color: var(--primary);
  transition: all 0.25s ease;
}
.pain-card:hover .icon-box {
  background: var(--gradient-brand);
  color: #fff;
}

/* Solution cards */
.solution-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-card);
  padding: 1.75rem;
  transition: all 0.25s ease;
}
.solution-card:hover {
  background: rgba(255,255,255,0.09);
  border-color: rgba(200,133,63,0.4);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.35);
}
.solution-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.8);
  background: rgba(255,255,255,0.04);
  margin: 0 6px 6px 0;
  transition: all 0.2s ease;
}
.solution-tag:hover {
  border-color: var(--secondary);
  color: var(--secondary);
}

/* Scrollable tags */
.scroll-tags {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  -webkit-overflow-scrolling: touch;
}
.scroll-tags::-webkit-scrollbar {
  height: 4px;
}
.scroll-tags::-webkit-scrollbar-track {
  background: rgba(255,255,255,0.05);
  border-radius: 4px;
}
.scroll-tags::-webkit-scrollbar-thumb {
  background: rgba(200,133,63,0.4);
  border-radius: 4px;
}
.scroll-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 8px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255,255,255,0.25);
  background: transparent;
  color: rgba(255,255,255,0.7);
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  transition: all 0.25s ease;
  cursor: pointer;
}
.scroll-tag:hover {
  border-color: var(--secondary);
  color: var(--secondary);
}
.scroll-tag.active {
  background: var(--gradient-brand);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 16px rgba(47,82,51,0.4);
}

/* Data badges */
.data-badge {
  background: rgba(255,255,255,0.6);
  border: 1px solid rgba(200,133,63,0.3);
  border-radius: 20px;
  padding: 2rem 1.5rem;
  text-align: center;
  transition: all 0.25s ease;
}
.data-badge:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-card);
  transform: translateY(-3px);
}
.data-badge .number {
  font-size: clamp(2.25rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--secondary);
  line-height: 1.1;
}
.data-badge .label {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* Testimonial cards */
.testimonial-card {
  background: var(--bg-card);
  border-radius: var(--radius-card);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  transition: all 0.25s ease;
}
.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.stars {
  color: #F5A623;
  letter-spacing: 2px;
}

/* FAQ accordion */
.accordion-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.3s ease;
}
.accordion-item[open] {
  border-color: var(--secondary);
}
.accordion-item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-main);
  transition: color 0.2s ease;
}
.accordion-item summary::-webkit-details-marker {
  display: none;
}
.accordion-item summary:hover {
  color: var(--secondary);
}
.accordion-item .accordion-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--text-muted);
  transition: all 0.3s ease;
}
.accordion-item[open] .accordion-icon {
  background: var(--secondary);
  color: #fff;
  transform: rotate(45deg);
}
.accordion-item .answer-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.accordion-item[open] .answer-content {
  max-height: 500px;
}
.accordion-item .answer-content p {
  padding: 0 1.5rem 1.25rem;
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* Form */
.form-input {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-input);
  border: 1px solid #E2D9CB;
  background: #fff;
  color: var(--text-main);
  font-size: 0.9375rem;
  transition: all 0.2s ease;
}
.form-input:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(200,133,63,0.15);
}
.form-input::placeholder {
  color: #A89E90;
}
.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: #3D342A;
  margin-bottom: 6px;
}

/* Footer */
.footer-link {
  color: rgba(250,246,239,0.6);
  font-size: 0.9rem;
  transition: color 0.2s ease;
}
.footer-link:hover {
  color: var(--secondary);
}

/* Hero floating tags */
.hero-tag {
  position: absolute;
  background: rgba(250,246,239,0.9);
  color: var(--text-main);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  backdrop-filter: blur(4px);
  animation: floatTag 4s ease-in-out infinite;
}
@keyframes floatTag {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Timeline */
.timeline-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--secondary);
  flex-shrink: 0;
  box-shadow: 0 0 0 4px rgba(200,133,63,0.2);
}
.timeline-line {
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, var(--secondary) 0%, rgba(200,133,63,0.2) 100%);
}

/* News section */
.news-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-light);
  transition: padding-left 0.25s ease;
}
.news-item:last-child {
  border-bottom: none;
}
.news-item:hover {
  padding-left: 8px;
}
.news-item:hover .news-title {
  color: var(--secondary);
}
.news-title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-main);
  line-height: 1.5;
  transition: color 0.2s ease;
}
.news-date {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 1024px) {
  .hero-split {
    grid-template-columns: 1fr;
  }
  .hero-visual {
    margin-top: 3rem;
  }
}
@media (max-width: 768px) {
  .hero-split {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .hero-visual {
    margin-top: 0;
  }
}
@media (max-width: 520px) {
  .container-custom {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
  .hero-tag {
    font-size: 0.7rem;
    padding: 6px 12px;
  }
}