:root {
  --ink: #0a0a0a;
  --paper: #f5f0eb;
  --crimson: #d9364a;
  --saffron: #f5a623;
  --saffron-dim: rgba(245, 166, 35, 0.15);
  --plum: #2d1b3d;
  --plum-light: #4a2d5e;
  --mint: #7ed4ad;
  --mint-dim: rgba(126, 212, 173, 0.2);
  --grid: 8px;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", serif;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  overflow-x: hidden;
}

::selection {
  background: var(--saffron);
  color: var(--ink);
}

/* ===== container ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 calc(var(--grid) * 3);
}

/* ===== site-header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(245, 240, 235, 0.85);
  backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid rgba(10, 10, 10, 0.06);
  transition: background 0.4s var(--ease-out-expo);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 calc(var(--grid) * 3);
  max-width: 1280px;
  margin: 0 auto;
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
  position: relative;
  transition: color 0.3s;
}

.logo::after {
  content: "✦";
  display: inline-block;
  margin-left: 4px;
  font-size: 1rem;
  color: var(--crimson);
  animation: logoSpark 2.4s infinite alternate var(--ease-out-expo);
}

@keyframes logoSpark {
  0% { opacity: 0.4; transform: scale(0.8) rotate(-8deg); }
  100% { opacity: 1; transform: scale(1.2) rotate(12deg); }
}

.main-nav {
  display: flex;
  align-items: center;
  gap: calc(var(--grid) * 4);
}

.main-nav a {
  text-decoration: none;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  position: relative;
  padding: 4px 0;
  transition: color 0.3s;
}

.main-nav a::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--crimson);
  transition: width 0.4s var(--ease-out-expo);
}

.main-nav a:hover {
  color: var(--crimson);
}

.main-nav a:hover::before {
  width: 100%;
}

.nav-cta {
  background: var(--ink);
  color: var(--paper) !important;
  padding: 8px 20px !important;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.85rem !important;
  transition: all 0.3s var(--ease-spring);
  border: 1px solid transparent;
}

.nav-cta:hover {
  background: var(--crimson) !important;
  color: #fff !important;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(217, 54, 74, 0.25);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 28px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: all 0.3s var(--ease-out-expo);
}

/* ===== hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--paper) 0%, #e8dfd6 100%);
}

.hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -20%;
  width: 70%;
  height: 140%;
  background: radial-gradient(ellipse at center, var(--saffron-dim) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 620px;
  padding: calc(var(--grid) * 6) 0;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--crimson);
  background: var(--saffron-dim);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: calc(var(--grid) * 3);
  border: 1px solid rgba(217, 54, 74, 0.15);
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 7vw, 5.2rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: calc(var(--grid) * 3);
}

.hero h1 span {
  color: var(--crimson);
  text-decoration: underline wavy var(--saffron) 3px;
  text-underline-offset: 8px;
}

.hero p {
  font-size: 1.1rem;
  color: rgba(10, 10, 10, 0.7);
  margin-bottom: calc(var(--grid) * 4);
  max-width: 480px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: calc(var(--grid) * 2);
  flex-wrap: wrap;
}

.hero-image {
  position: absolute;
  right: -5%;
  top: 50%;
  transform: translateY(-50%);
  width: 55%;
  height: 70%;
  background: linear-gradient(145deg, var(--plum), var(--plum-light));
  border-radius: 24px;
  opacity: 0.12;
  z-index: 1;
  mask-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M47.7,-57.2C62.1,-48.4,74.9,-34.6,79.2,-18.4C83.5,-2.2,79.3,16.3,70.1,31.5C60.9,46.7,46.7,58.6,30.5,65.8C14.3,73,-4,75.5,-21.1,70.2C-38.2,64.9,-54.1,51.8,-63.9,35.1C-73.7,18.4,-77.4,-1.9,-71.8,-18.8C-66.2,-35.7,-51.3,-49.2,-35.4,-57.5C-19.5,-65.8,-2.4,-68.9,12.7,-65.3C27.8,-61.7,33.4,-66,47.7,-57.2Z' transform='translate(100 100)'/%3E%3C/svg%3E");
  mask-size: contain;
  mask-repeat: no-repeat;
  mask-position: center;
}

/* ===== buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 100px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.35s var(--ease-spring);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 0 4px 16px rgba(10, 10, 10, 0.12);
}

.btn-primary:hover {
  background: var(--crimson);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 32px rgba(217, 54, 74, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--ink);
  border: 1.5px solid var(--ink);
}

.btn-outline:hover {
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-3px);
}

/* ===== section ===== */
.section {
  padding: calc(var(--grid) * 12) 0;
  position: relative;
}

.section:nth-child(even) {
  background: #f0eae3;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--crimson);
  margin-bottom: calc(var(--grid) * 2);
  padding: 4px 12px;
  border-left: 3px solid var(--saffron);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: calc(var(--grid) * 2);
}

.section-desc {
  font-size: 1.05rem;
  color: rgba(10, 10, 10, 0.65);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: calc(var(--grid) * 5);
}

/* ===== cards-grid ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: calc(var(--grid) * 3);
}

.category-card {
  background: var(--paper);
  border-radius: 20px;
  padding: calc(var(--grid) * 4);
  border: 1px solid rgba(10, 10, 10, 0.06);
  transition: all 0.4s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}

.category-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--crimson), var(--saffron));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--ease-out-expo);
}

.category-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 48px rgba(10, 10, 10, 0.08);
  border-color: rgba(217, 54, 74, 0.15);
}

.category-card:hover::after {
  transform: scaleX(1);
}

.card-icon {
  width: 52px;
  height: 52px;
  background: var(--saffron-dim);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: calc(var(--grid) * 3);
  color: var(--crimson);
  transition: all 0.3s;
}

.category-card:hover .card-icon {
  background: var(--crimson);
  color: #fff;
  transform: scale(1.05) rotate(-4deg);
}

.category-card h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: calc(var(--grid) * 1.5);
}

.category-card p {
  font-size: 0.9rem;
  color: rgba(10, 10, 10, 0.6);
  line-height: 1.6;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: calc(var(--grid) * 2.5);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--crimson);
  text-decoration: none;
  transition: gap 0.3s;
}

.card-link:hover {
  gap: 12px;
}

/* ===== feature-block ===== */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(var(--grid) * 6);
  align-items: center;
}

.feature-image {
  width: 100%;
  aspect-ratio: 4/3;
  background: linear-gradient(145deg, var(--plum), var(--plum-light));
  border-radius: 24px;
  position: relative;
  overflow: hidden;
  opacity: 0.08;
  mask-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M44.1,-50.7C57.1,-42.3,67.3,-28.1,71.8,-12C76.3,4.1,75.1,22.2,66.7,36.1C58.3,50,42.7,59.7,25.9,65.3C9.1,70.9,-8.9,72.4,-25.3,67.2C-41.7,62,-56.5,50.1,-65.4,34.5C-74.3,18.9,-77.3,-0.4,-72.3,-16.7C-67.3,-33,-54.3,-46.3,-39.5,-54.6C-24.7,-62.9,-8.1,-66.2,5.9,-63.9C19.9,-61.6,31.1,-59.1,44.1,-50.7Z' transform='translate(100 100)'/%3E%3C/svg%3E");
  mask-size: contain;
  mask-repeat: no-repeat;
  mask-position: center;
}

.feature-text {
  padding: calc(var(--grid) * 2) 0;
}

.feature-list {
  list-style: none;
  margin-top: calc(var(--grid) * 3);
}

.feature-list li {
  padding: calc(var(--grid) * 1.5) 0;
  border-bottom: 1px solid rgba(10, 10, 10, 0.06);
  display: flex;
  align-items: center;
  gap: calc(var(--grid) * 2);
  font-size: 0.95rem;
}

.feature-list li::before {
  content: "→";
  color: var(--crimson);
  font-weight: 600;
}

/* ===== stats-bar ===== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: calc(var(--grid) * 2);
  padding: calc(var(--grid) * 6) 0;
  border-top: 1px solid rgba(10, 10, 10, 0.06);
  border-bottom: 1px solid rgba(10, 10, 10, 0.06);
  margin: calc(var(--grid) * 6) 0;
}

.stat-item {
  text-align: center;
  padding: calc(var(--grid) * 2);
}

.stat-number {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 700;
  color: var(--crimson);
  line-height: 1;
  margin-bottom: calc(var(--grid) * 1);
}

.stat-label {
  font-size: 0.85rem;
  color: rgba(10, 10, 10, 0.55);
  font-weight: 500;
  letter-spacing: 0.04em;
}

/* ===== content-wall ===== */
.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: calc(var(--grid) * 3);
}

.content-wall-item {
  background: var(--paper);
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(10, 10, 10, 0.06);
  transition: all 0.4s var(--ease-out-expo);
}

.content-wall-item:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(10, 10, 10, 0.06);
}

.content-wall-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
  background: linear-gradient(135deg, var(--saffron-dim), var(--mint-dim));
}

.content-wall-body {
  padding: calc(var(--grid) * 3);
}

.content-wall-body h4 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: calc(var(--grid) * 1);
}

.content-wall-body p {
  font-size: 0.85rem;
  color: rgba(10, 10, 10, 0.6);
  line-height: 1.6;
}

/* ===== faq-list ===== */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid rgba(10, 10, 10, 0.08);
  padding: calc(var(--grid) * 2.5) 0;
  cursor: pointer;
}

.faq-item summary {
  font-size: 1.05rem;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color 0.3s;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--crimson);
  transition: transform 0.4s var(--ease-out-expo);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding-top: calc(var(--grid) * 2);
  font-size: 0.92rem;
  color: rgba(10, 10, 10, 0.65);
  line-height: 1.7;
  animation: fadeSlide 0.4s var(--ease-out-expo);
}

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== cta-banner ===== */
.cta-banner {
  background: var(--ink);
  color: var(--paper);
  border-radius: 24px;
  padding: calc(var(--grid) * 8) calc(var(--grid) * 6);
  text-align: center;
  position: relative;
  overflow: hidden;
  margin: calc(var(--grid) * 6) 0;
}

.cta-banner::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -30%;
  width: 160%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 50%, rgba(217, 54, 74, 0.12), transparent 60%);
  pointer-events: none;
}

.cta-banner h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: calc(var(--grid) * 2);
  position: relative;
}

.cta-banner p {
  font-size: 1rem;
  opacity: 0.7;
  max-width: 480px;
  margin: 0 auto calc(var(--grid) * 4);
  position: relative;
}

.cta-banner .btn-primary {
  background: var(--crimson);
  color: #fff;
}

.cta-banner .btn-primary:hover {
  background: var(--saffron);
  color: var(--ink);
  box-shadow: 0 8px 32px rgba(245, 166, 35, 0.3);
}

/* ===== site-footer ===== */
.site-footer {
  background: var(--ink);
  color: rgba(245, 240, 235, 0.7);
  padding: calc(var(--grid) * 8) 0 calc(var(--grid) * 4);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: calc(var(--grid) * 4);
  margin-bottom: calc(var(--grid) * 6);
}

.footer-brand .logo {
  color: var(--paper);
  margin-bottom: calc(var(--grid) * 2);
  display: inline-block;
}

.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.7;
  max-width: 280px;
}

.footer-col h5 {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--paper);
  font-weight: 600;
  margin-bottom: calc(var(--grid) * 2.5);
}

.footer-col a {
  display: block;
  color: rgba(245, 240, 235, 0.6);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 4px 0;
  transition: color 0.3s, padding-left 0.3s;
}

.footer-col a:hover {
  color: var(--saffron);
  padding-left: 6px;
}

.footer-bottom {
  border-top: 1px solid rgba(245, 240, 235, 0.08);
  padding-top: calc(var(--grid) * 3);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: calc(var(--grid) * 2);
  font-size: 0.8rem;
}

/* ===== utilities ===== */
.text-accent {
  color: var(--crimson);
}

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

.seo-description {
  font-size: 0.82rem;
  color: rgba(10, 10, 10, 0.4);
  max-width: 640px;
  line-height: 1.7;
  margin: calc(var(--grid) * 2) auto;
}

/* ===== responsive ===== */
@media (max-width: 768px) {
  .container {
    padding: 0 calc(var(--grid) * 2);
  }

  .main-nav {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    background: rgba(245, 240, 235, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: calc(var(--grid) * 4);
    gap: calc(var(--grid) * 2);
    transform: translateY(-120%);
    transition: transform 0.5s var(--ease-out-expo);
    border-bottom: 1px solid rgba(10, 10, 10, 0.06);
    box-shadow: 0 20px 40px rgba(10, 10, 10, 0.06);
  }

  .main-nav.active {
    transform: translateY(0);
  }

  .menu-toggle {
    display: flex;
  }

  .hero {
    flex-direction: column;
    padding-top: 72px;
    min-height: auto;
  }

  .hero-content {
    max-width: 100%;
    padding: calc(var(--grid) * 4) 0;
  }

  .hero-image {
    position: relative;
    right: auto;
    top: auto;
    transform: none;
    width: 100%;
    height: 240px;
    margin-top: calc(var(--grid) * 3);
  }

  .feature-block {
    grid-template-columns: 1fr;
    gap: calc(var(--grid) * 3);
  }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: calc(var(--grid) * 3);
  }

  .cta-banner {
    padding: calc(var(--grid) * 5) calc(var(--grid) * 3);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 calc(var(--grid) * 1.5);
  }

  .header-inner {
    padding: 0 calc(var(--grid) * 1.5);
    height: 64px;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .stats-bar {
    grid-template-columns: 1fr 1fr;
    gap: calc(var(--grid) * 1);
  }

  .stat-item {
    padding: calc(var(--grid) * 1.5);
  }

  .content-wall {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .section {
    padding: calc(var(--grid) * 6) 0;
  }

  .cta-banner {
    padding: calc(var(--grid) * 4) calc(var(--grid) * 2);
    border-radius: 16px;
  }
}