/* ========================================
   妈妈菜园官网 — 样式表
   ======================================== */

/* ----- 重置 & 变量 ----- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --green-50: #e8f5e9;
  --green-100: #c8e6c9;
  --green-200: #a5d6a7;
  --green-400: #66bb6a;
  --green-500: #4caf50;
  --green-600: #43a047;
  --green-700: #388e3c;
  --green-800: #2d8a4e;
  --green-900: #1b5e20;

  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --container: 1200px;
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-800);
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

ul {
  list-style: none;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ----- Section 通用 ----- */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-header h2 {
  font-size: 30px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
}
.section-header p {
  font-size: 17px;
  color: var(--gray-500);
}

/* ----- Button ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--green-600);
  color: #fff;
  border-color: var(--green-600);
}
.btn-primary:hover {
  background: var(--green-700);
  border-color: var(--green-700);
}
.btn-outline {
  background: transparent;
  color: var(--green-600);
  border-color: var(--green-600);
}
.btn-outline:hover {
  background: var(--green-50);
}
.btn-lg {
  padding: 14px 36px;
  font-size: 16px;
}

/* ========================================
   Header / 导航
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--gray-200);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 22px;
  font-weight: 700;
  color: var(--gray-900);
}
.logo-icon {
  font-size: 28px;
}

.nav {
  display: flex;
  gap: 32px;
}
.nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-600);
}
.nav a:hover {
  color: var(--green-600);
}

.header-actions {
  display: flex;
  gap: 12px;
}

/* ========================================
   Hero
   ======================================== */
.hero {
  padding: 140px 0 100px;
  background: linear-gradient(135deg, var(--green-50) 0%, #fff 50%, var(--green-50) 100%);
}

.hero-inner {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero-text h1 {
  font-size: 46px;
  font-weight: 800;
  line-height: 1.2;
  color: var(--gray-900);
  margin-bottom: 20px;
}

.hero-text p {
  font-size: 18px;
  color: var(--gray-500);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-btns {
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-size: 28px;
  font-weight: 800;
  color: var(--green-700);
}

.stat-label {
  font-size: 14px;
  color: var(--gray-400);
  margin-top: 2px;
}

/* ========================================
   About
   ======================================== */
.about {
  padding: 100px 0;
  background: #fff;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.about-card {
  text-align: center;
  padding: 40px 24px;
  border-radius: 16px;
  background: var(--gray-50);
  transition: var(--transition);
}

.about-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.06);
}

.about-icon {
  font-size: 40px;
  margin-bottom: 16px;
}

.about-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--gray-900);
}

.about-card p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ========================================
   Features
   ======================================== */
.features {
  padding: 100px 0;
  background: var(--gray-50);
}

.features-list {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.feature-item {
  padding: 36px 40px;
  background: #fff;
  border-radius: 16px;
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}

.feature-item:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}

.feature-desc h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 12px;
}

.feature-desc p {
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.7;
  margin-bottom: 16px;
}

.feature-desc ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
}

.feature-desc ul li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--gray-600);
}

.feature-desc ul li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--green-500);
  font-weight: 700;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--gray-900);
  color: var(--gray-300);
}

.footer-main {
  padding: 60px 0 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer-col p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray-400);
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 14px;
  color: var(--gray-400);
}

.footer-col ul li a:hover {
  color: var(--green-400);
}

/* ----- Footer 底部 (备案号) ----- */
.footer-bottom {
  padding: 20px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--gray-500);
}

.footer-bottom a {
  color: var(--gray-400);
  transition: var(--transition);
}

.footer-bottom a:hover {
  color: var(--green-400);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1024px) {
  .nav { display: none; }
  .hero-text h1 { font-size: 36px; }
  .hero-stats { gap: 36px; }
  .about-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .hero { padding: 120px 0 60px; }
  .hero-text h1 { font-size: 28px; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .about-grid { grid-template-columns: 1fr; }

  .feature-item { padding: 28px 20px; }
  .section-header h2 { font-size: 24px; }
  .footer-grid { grid-template-columns: 1fr; }
}