/* ===== CSS Reset & Variables ===== */
:root {
  --c-deep: #10281c;
  --c-forest: #1a4a32;
  --c-green: #2d6a4f;
  --c-moss: #4a8c6f;
  --c-gold: #c8963e;
  --c-gold-light: #e0b860;
  --c-cream: #f7f3eb;
  --c-mist: #eae4d9;
  --c-white: #fcfaf7;
  --c-text: #1a1a1a;
  --c-text-mid: #4a4a4a;
  --c-text-light: #7a7a7a;
  --font-display: 'Noto Serif SC', 'STSong', 'SimSun', serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,.1);
  --shadow-lg: 0 8px 40px rgba(0,0,0,.12);
  --radius: 8px;
  --radius-lg: 16px;
  --max-w: 1200px;
  --nav-h: 72px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }

body {
  font-family: var(--font-body);
  color: var(--c-text);
  background: var(--c-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ===== Typography ===== */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.3; }
h1 { font-size: clamp(2rem, 4vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.5rem); }

.section-label {
  display: inline-block;
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .15em;
  color: var(--c-gold);
  margin-bottom: .5rem;
  font-weight: 500;
}

.section-title {
  margin-bottom: 1rem;
  color: var(--c-deep);
}

.section-desc {
  color: var(--c-text-mid);
  max-width: 600px;
  margin: 0 auto 3rem;
  font-size: 1.05rem;
}

.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section { padding: 5rem 0; }

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(252, 250, 247, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,.06);
  transition: box-shadow .3s;
}

.nav.scrolled { box-shadow: var(--shadow-sm); }

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-forest);
  letter-spacing: .02em;
  white-space: nowrap;
}

.nav-logo span { color: var(--c-gold); }

.nav-links {
  display: flex;
  gap: .25rem;
  align-items: center;
}

.nav-links a {
  padding: .5rem 1rem;
  font-size: .9rem;
  color: var(--c-text-mid);
  border-radius: 6px;
  transition: all .2s;
  font-weight: 500;
}

.nav-links a:hover { color: var(--c-forest); background: rgba(26,74,50,.06); }

.nav-cta {
  background: var(--c-gold) !important;
  color: #fff !important;
  padding: .5rem 1.25rem !important;
}

.nav-cta:hover { background: var(--c-gold-light) !important; color: #fff !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: .5rem;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--c-forest);
  transition: all .3s;
  border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(170deg, #f7f3eb 0%, #e8e0d3 30%, #d5cfc0 60%, #c8c0ad 100%);
  overflow: hidden;
  padding-top: var(--nav-h);
}

.hero-mountains {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 55%;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: 2rem 0;
}

.hero-badge {
  display: inline-block;
  background: rgba(200,150,62,.12);
  color: var(--c-gold);
  font-size: .85rem;
  padding: .35rem 1rem;
  border-radius: 100px;
  margin-bottom: 1.5rem;
  font-weight: 500;
  letter-spacing: .05em;
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  color: var(--c-deep);
  margin-bottom: 1.25rem;
  letter-spacing: .02em;
  line-height: 1.2;
}

.hero h1 em {
  font-style: normal;
  color: var(--c-gold);
  position: relative;
}

.hero h1 em::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--c-gold);
  opacity: .3;
  border-radius: 2px;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--c-text-mid);
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.hero-btns {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .85rem 2rem;
  border-radius: 100px;
  font-size: .95rem;
  font-weight: 600;
  transition: all .3s;
  cursor: pointer;
  border: none;
  letter-spacing: .02em;
}

.btn-primary {
  background: var(--c-gold);
  color: #fff;
  box-shadow: 0 4px 16px rgba(200,150,62,.3);
}

.btn-primary:hover { background: var(--c-gold-light); transform: translateY(-1px); box-shadow: 0 6px 24px rgba(200,150,62,.4); }

.btn-outline {
  background: transparent;
  color: var(--c-forest);
  border: 2px solid var(--c-forest);
}

.btn-outline:hover { background: var(--c-forest); color: #fff; }

/* ===== Mountain SVG Decoration ===== */
.mountain-svg {
  width: 100%;
  height: 100%;
}

/* ===== Advantages Section ===== */
.advantages {
  background: var(--c-white);
  padding: 5rem 0;
}

.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.adv-card {
  background: var(--c-cream);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: transform .3s, box-shadow .3s;
  position: relative;
  overflow: hidden;
}

.adv-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-forest), var(--c-moss));
  opacity: 0;
  transition: opacity .3s;
}

.adv-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.adv-card:hover::before { opacity: 1; }

.adv-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(26,74,50,.08);
  border-radius: 50%;
}

.adv-icon svg { width: 28px; height: 28px; }

.adv-card h3 {
  font-size: 1.05rem;
  color: var(--c-deep);
  margin-bottom: .75rem;
}

.adv-card p {
  font-size: .9rem;
  color: var(--c-text-mid);
  line-height: 1.65;
}

.adv-number {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--c-gold);
  font-weight: 700;
}

/* ===== Products Section ===== */
.products {
  background: var(--c-cream);
  text-align: center;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  text-align: left;
}

.product-card {
  background: var(--c-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform .3s, box-shadow .3s;
  display: flex;
  flex-direction: column;
}

.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.product-img {
  height: 200px;
  background: linear-gradient(135deg, var(--c-forest), var(--c-moss));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-img svg {
  width: 100%;
  height: 100%;
  opacity: .85;
}

.product-tag {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: rgba(255,255,255,.9);
  color: var(--c-forest);
  padding: .25rem .75rem;
  border-radius: 100px;
  font-size: .75rem;
  font-weight: 600;
}

.product-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-body h3 {
  font-size: 1.15rem;
  color: var(--c-deep);
  margin-bottom: .75rem;
}

.product-body p {
  font-size: .9rem;
  color: var(--c-text-mid);
  line-height: 1.65;
  flex: 1;
  margin-bottom: 1rem;
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-size: .9rem;
  font-weight: 600;
  color: var(--c-gold);
  transition: gap .2s;
}

.product-link:hover { gap: .65rem; }

.product-link svg { width: 16px; height: 16px; }

/* ===== About Section ===== */
.about-brief {
  background: var(--c-white);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-visual {
  position: relative;
  height: 400px;
  background: linear-gradient(160deg, var(--c-cream), var(--c-mist));
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-visual svg {
  width: 80%;
  height: 80%;
}

.about-text h2 { margin-bottom: 1.25rem; }

.about-text p {
  color: var(--c-text-mid);
  font-size: 1rem;
  margin-bottom: 1rem;
  line-height: 1.8;
}

.about-text .btn { margin-top: .5rem; }

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(0,0,0,.06);
}

.stat-item {
  text-align: center;
}

.stat-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--c-gold);
}

.stat-label {
  font-size: .8rem;
  color: var(--c-text-light);
  margin-top: .25rem;
}

/* ===== CTA Section ===== */
.cta-section {
  background: linear-gradient(160deg, var(--c-deep), var(--c-forest));
  color: #fff;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 70%, rgba(200,150,62,.1) 0%, transparent 50%);
  pointer-events: none;
}

.cta-section h2 {
  color: #fff;
  margin-bottom: 1rem;
}

.cta-section p {
  color: rgba(255,255,255,.75);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

.cta-info {
  display: flex;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.cta-item {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.cta-item svg { width: 24px; height: 24px; opacity: .8; }

.cta-item span {
  font-size: 1.1rem;
  font-weight: 500;
}

/* ===== Footer ===== */
.footer {
  background: var(--c-deep);
  color: rgba(255,255,255,.7);
  padding: 3rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-brand h3 {
  font-family: var(--font-display);
  color: #fff;
  font-size: 1.2rem;
  margin-bottom: .75rem;
}

.footer-brand h3 span { color: var(--c-gold); }

.footer-brand p {
  font-size: .85rem;
  line-height: 1.7;
}

.footer-col h4 {
  color: #fff;
  font-family: var(--font-body);
  font-size: .9rem;
  font-weight: 600;
  margin-bottom: 1rem;
  letter-spacing: .05em;
}

.footer-col a {
  display: block;
  font-size: .85rem;
  padding: .3rem 0;
  transition: color .2s;
  color: rgba(255,255,255,.6);
}

.footer-col a:hover { color: var(--c-gold); }

.footer-contact p {
  font-size: .85rem;
  margin-bottom: .5rem;
  display: flex;
  align-items: center;
  gap: .5rem;
}

.footer-contact svg { width: 16px; height: 16px; flex-shrink: 0; opacity: .6; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 1.5rem;
  text-align: center;
  font-size: .8rem;
  color: rgba(255,255,255,.4);
}

/* ===== Page Header (sub pages) ===== */
.page-header {
  padding: calc(var(--nav-h) + 4rem) 0 3rem;
  background: var(--c-cream);
  text-align: center;
}

.page-header h1 { color: var(--c-deep); margin-bottom: .75rem; }
.page-header p { color: var(--c-text-mid); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }

/* ===== About Page ===== */
.about-full { background: var(--c-white); }

.about-section {
  margin-bottom: 4rem;
}

.about-section:last-child { margin-bottom: 0; }

.about-section h2 {
  font-size: 1.5rem;
  color: var(--c-deep);
  margin-bottom: 1.5rem;
  padding-bottom: .75rem;
  border-bottom: 2px solid var(--c-gold);
  display: inline-block;
}

.about-section p {
  color: var(--c-text-mid);
  font-size: 1rem;
  line-height: 1.9;
  margin-bottom: 1rem;
}

.promise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.promise-card {
  background: var(--c-cream);
  padding: 1.5rem;
  border-radius: var(--radius);
  display: flex;
  align-items: flex-start;
  gap: .75rem;
}

.promise-card svg { width: 24px; height: 24px; flex-shrink: 0; margin-top: 2px; }

.promise-card div h4 {
  font-family: var(--font-body);
  font-size: .95rem;
  font-weight: 600;
  margin-bottom: .25rem;
  color: var(--c-deep);
}

.promise-card div p { font-size: .85rem; margin: 0; }

.data-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.data-card {
  background: var(--c-cream);
  padding: 1.75rem 1rem;
  border-radius: var(--radius);
  text-align: center;
}

.data-card .num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--c-gold);
}

.data-card .label {
  font-size: .85rem;
  color: var(--c-text-mid);
  margin-top: .35rem;
}

/* ===== Products Page ===== */
.products-full { background: var(--c-white); }

.product-section {
  margin-bottom: 4rem;
}

.product-section:last-child { margin-bottom: 0; }

.product-section h2 {
  font-size: 1.5rem;
  color: var(--c-deep);
  margin-bottom: .5rem;
  padding-bottom: .75rem;
  border-bottom: 2px solid var(--c-gold);
  display: inline-block;
}

.product-section .intro {
  color: var(--c-text-mid);
  font-size: 1rem;
  line-height: 1.8;
  margin: 1rem 0 1.5rem;
}

.product-detail {
  background: var(--c-cream);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 1.5rem;
}

.product-detail h3 {
  font-size: 1.15rem;
  color: var(--c-deep);
  margin-bottom: .75rem;
}

.product-detail .tags {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.product-detail .tags span {
  font-size: .78rem;
  background: rgba(26,74,50,.08);
  color: var(--c-forest);
  padding: .25rem .75rem;
  border-radius: 100px;
  font-weight: 500;
}

.product-detail p {
  font-size: .92rem;
  color: var(--c-text-mid);
  line-height: 1.7;
}

.product-detail .includes {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(0,0,0,.06);
  font-size: .88rem;
  color: var(--c-text-light);
}

.suitable-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: .75rem;
  margin: 1rem 0;
}

.suitable-item {
  background: var(--c-cream);
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  font-size: .9rem;
  color: var(--c-text-mid);
  display: flex;
  align-items: center;
  gap: .5rem;
}

.suitable-item::before {
  content: '◆';
  color: var(--c-gold);
  font-size: .6rem;
}

.flow-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.flow-step {
  text-align: center;
  position: relative;
}

.flow-step .step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--c-gold);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: .75rem;
}

.flow-step h4 {
  font-family: var(--font-body);
  font-size: .95rem;
  color: var(--c-deep);
  margin-bottom: .35rem;
}

.flow-step p { font-size: .82rem; color: var(--c-text-light); }

.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.service-card {
  background: var(--c-cream);
  padding: 1.5rem;
  border-radius: var(--radius);
}

.service-card h4 {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--c-deep);
  margin-bottom: .5rem;
}

.service-card p { font-size: .85rem; color: var(--c-text-mid); line-height: 1.6; }

/* ===== Contact Page ===== */
.contact-full { background: var(--c-white); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-info h2 {
  font-size: 1.5rem;
  color: var(--c-deep);
  margin-bottom: 1.5rem;
  padding-bottom: .75rem;
  border-bottom: 2px solid var(--c-gold);
  display: inline-block;
}

.contact-info > p {
  color: var(--c-text-mid);
  line-height: 1.8;
  margin-bottom: 2rem;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.contact-detail {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--c-cream);
  border-radius: var(--radius);
}

.contact-detail svg { width: 22px; height: 22px; flex-shrink: 0; }

.contact-detail div .label {
  font-size: .8rem;
  color: var(--c-text-light);
  margin-bottom: .15rem;
}

.contact-detail div .value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-deep);
}

.contact-form-wrapper {
  background: var(--c-cream);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
}

.contact-form-wrapper h3 {
  font-size: 1.2rem;
  color: var(--c-deep);
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: .4rem;
}

.form-group label .required { color: var(--c-gold); }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: .75rem 1rem;
  border: 1px solid rgba(0,0,0,.1);
  border-radius: var(--radius);
  font-size: .9rem;
  font-family: var(--font-body);
  color: var(--c-text);
  background: var(--c-white);
  transition: border-color .2s, box-shadow .2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--c-gold);
  box-shadow: 0 0 0 3px rgba(200,150,62,.15);
}

.form-group textarea { resize: vertical; min-height: 120px; }

.form-note {
  font-size: .8rem;
  color: var(--c-text-light);
  margin-top: .75rem;
  text-align: center;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .about-content { grid-template-columns: 1fr; gap: 2rem; }
  .about-visual { height: 300px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .data-grid { grid-template-columns: repeat(2, 1fr); }
  .flow-steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(252, 250, 247, 0.98);
    flex-direction: column;
    padding: 1rem;
    gap: .25rem;
    box-shadow: var(--shadow-md);
    transform: translateY(-110%);
    opacity: 0;
    transition: all .3s;
    pointer-events: none;
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-toggle { display: flex; }

  .hero { text-align: center; }
  .hero-content { max-width: 100%; }
  .hero-btns { justify-content: center; }

  .adv-grid { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-info { flex-direction: column; align-items: center; gap: 1rem; }
  .data-grid { grid-template-columns: 1fr 1fr; }
  .flow-steps { grid-template-columns: 1fr 1fr; }
  .suitable-list { grid-template-columns: 1fr; }
  .promise-grid { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: 1fr; }
  .contact-form-wrapper { padding: 1.5rem; }

  section { padding: 3rem 0; }
}