/* ============================================================
   MIKA LEMON Inc. - 官网主样式表
   风格参考：Vitajoy Group (保健品原料行业, 白绿主色调)
   ============================================================ */

:root {
  --primary: #00b0ad;
  --primary-dark: #009a97;
  --primary-light: #e0f7f6;
  --accent: #f5a623;
  --text-dark: #1a1a2e;
  --text-muted: #6b7280;
  --text-light: #9ca3af;
  --bg-white: #ffffff;
  --bg-light: #f9fafb;
  --bg-gray: #f3f4f6;
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  color: var(--text-dark);
  line-height: 1.6;
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }

.section-title {
  font-size: 2rem; font-weight: 700; text-align: center;
  margin-bottom: 0.75rem; color: var(--text-dark);
}
.section-subtitle {
  font-size: 1.05rem; color: var(--text-muted); text-align: center;
  max-width: 640px; margin: 0 auto 48px; line-height: 1.7;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 50px;
  font-weight: 600; font-size: 0.95rem;
  cursor: pointer; transition: var(--transition);
  border: 2px solid transparent; letter-spacing: 0.02em;
  font-family: inherit;
}
.btn-primary {
  background: var(--primary); color: #fff; border-color: var(--primary);
}
.btn-primary:hover {
  background: var(--primary-dark); border-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,176,173,0.35);
}
.btn-outline {
  background: transparent; color: var(--primary); border-color: var(--primary);
}
.btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
.btn-white {
  background: #fff; color: var(--primary); border-color: #fff;
}
.btn-white:hover { background: var(--bg-light); transform: translateY(-2px); }

/* ===========================
   HEADER
   =========================== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}
.header .container {
  display: flex; align-items: center;
  justify-content: space-between; height: 72px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.3rem; font-weight: 800; color: var(--text-dark);
}
.logo-icon {
  width: 40px; height: 40px; background: var(--primary);
  border-radius: 10px; display: flex; align-items: center;
  justify-content: center; color: #fff; font-weight: 700; font-size: 1rem;
}
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  font-size: 0.9rem; font-weight: 500; color: var(--text-muted);
  transition: var(--transition); position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0;
  width: 0; height: 2px; background: var(--primary);
  transition: var(--transition);
}
.nav-links a:hover { color: var(--primary); }
.nav-links a:hover::after { width: 100%; }
.nav-links .btn { padding: 10px 24px; font-size: 0.85rem; }

/* Mobile menu */
.menu-toggle {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; background: none; border: none; padding: 4px;
}
.menu-toggle span {
  width: 26px; height: 2.5px; background: var(--text-dark);
  border-radius: 2px; transition: var(--transition);
}

/* ===========================
   HERO
   =========================== */
.hero {
  padding-top: 72px; min-height: 90vh;
  display: flex; align-items: center;
  background: linear-gradient(135deg, #e0f7f6 0%, #f0fdfa 50%, #fff 100%);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -30%; right: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(0,176,173,0.08) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.hero .container {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 60px; align-items: center; position: relative; z-index: 1;
}
.hero-content h1 {
  font-size: 3rem; font-weight: 800; line-height: 1.15;
  margin-bottom: 20px; color: var(--text-dark);
}
.hero-content h1 span { color: var(--primary); }
.hero-content p {
  font-size: 1.1rem; color: var(--text-muted);
  line-height: 1.7; margin-bottom: 36px; max-width: 520px;
}
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-image { display: flex; justify-content: center; align-items: center; }
.hero-img {
  width: 100%; max-width: 520px; aspect-ratio: 4/3;
  border-radius: var(--radius); object-fit: cover;
  box-shadow: var(--shadow-lg);
}

/* ===========================
   PRODUCTS
   =========================== */
.products-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.product-card {
  background: var(--bg-white); border: 1px solid var(--border-color);
  border-radius: var(--radius); text-align: center;
  transition: var(--transition); cursor: pointer;
  overflow: hidden;
}
.product-card:hover {
  transform: translateY(-6px); box-shadow: var(--shadow-md);
  border-color: var(--primary);
}
.product-icon {
  width: 100%; aspect-ratio: 1/1; margin-bottom: 0;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; background: var(--bg-gray);
  border-radius: 0;
}
.product-icon img { width: 100%; height: 100%; object-fit: cover; display: block; }
.product-card h3 { font-size: 1rem; font-weight: 600; margin: 16px 0 4px; padding: 0 12px; }
.product-card p { font-size: 0.85rem; color: var(--text-muted); padding: 0 12px 20px; }
.view-all-link { text-align: center; margin-top: 40px; }
.view-all-link a {
  color: var(--primary); font-weight: 600; font-size: 1rem;
  transition: var(--transition); display: inline-flex; align-items: center; gap: 6px;
}
.view-all-link a:hover { gap: 12px; }

/* ===========================
   FEATURE SECTIONS
   =========================== */
.feature-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.feature-image { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-md); }
.feature-image-placeholder {
  width: 100%; aspect-ratio: 3/2;
  background: linear-gradient(135deg, #d1fae5, #a7f3d0);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; color: #065f46; font-weight: 500;
}
.feature-text h2 { font-size: 1.75rem; font-weight: 700; margin-bottom: 16px; }
.feature-text p { color: var(--text-muted); line-height: 1.7; margin-bottom: 24px; }

/* ===========================
   WHY CHOOSE US
   =========================== */
.why-section { background: var(--bg-light); }
.why-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.why-image { display: flex; justify-content: center; }
.why-image-placeholder {
  width: 100%; max-width: 400px; aspect-ratio: 9/10;
  background: linear-gradient(135deg, var(--primary-light), #b8f0ec);
  border-radius: var(--radius); display: flex; align-items: center;
  justify-content: center; font-size: 1.1rem; color: var(--primary);
  font-weight: 600; box-shadow: var(--shadow-md); text-align: center; padding: 20px;
}
.why-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.why-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; background: var(--bg-white);
  border-radius: var(--radius-sm); font-weight: 500; font-size: 0.95rem;
  box-shadow: var(--shadow-sm);
}
.why-item .check {
  width: 24px; height: 24px; background: var(--primary); color: #fff;
  border-radius: 50%; display: flex; align-items: center;
  justify-content: center; font-size: 0.75rem; flex-shrink: 0;
}

/* ===========================
   STATS
   =========================== */
.stats { background: var(--primary); color: #fff; padding: 60px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; text-align: center; }
.stat-item h3 { font-size: 2.8rem; font-weight: 800; margin-bottom: 4px; }
.stat-item p { font-size: 1rem; opacity: 0.85; font-weight: 500; }

/* ===========================
   ABOUT CARDS
   =========================== */
.about-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.about-card {
  background: var(--bg-white); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 36px 28px; text-align: center;
  transition: var(--transition);
}
.about-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.about-card .icon {
  width: 56px; height: 56px; margin: 0 auto 20px;
  background: var(--primary-light); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; color: var(--primary);
}
.about-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 12px; }
.about-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 16px; }
.about-card .link {
  color: var(--primary); font-weight: 600; font-size: 0.9rem;
  transition: var(--transition); display: inline-flex; align-items: center; gap: 4px;
}
.about-card .link:hover { gap: 8px; }

/* ===========================
   SERVICES
   =========================== */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.service-card {
  text-align: center; padding: 36px 24px; border-radius: var(--radius);
  background: var(--bg-white); border: 1px solid var(--border-color);
  transition: var(--transition);
}
.service-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.service-icon {
  width: 72px; height: 72px; margin: 0 auto 20px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem; color: var(--primary); background: var(--primary-light);
  transition: var(--transition); overflow: hidden;
}
.service-icon img { width: 48px; height: 48px; object-fit: contain; }
.service-card:hover .service-icon { background: var(--primary); color: #fff; }
.service-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.service-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }

/* ===========================
   STEPS
   =========================== */
.steps-section { background: var(--bg-light); }
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.step-card { text-align: center; padding: 36px 24px; }
.step-number {
  width: 56px; height: 56px; margin: 0 auto 20px;
  background: var(--primary); color: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; font-weight: 700;
}
.step-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.step-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }

/* ===========================
   CTA
   =========================== */
.cta-section {
  background: linear-gradient(135deg, var(--primary), #008b89);
  color: #fff; text-align: center; padding: 80px 0;
}
.cta-section h2 { font-size: 2rem; font-weight: 700; margin-bottom: 12px; }
.cta-section p {
  font-size: 1.1rem; opacity: 0.9; margin-bottom: 32px;
  max-width: 520px; margin-left: auto; margin-right: auto;
}

/* ===========================
   INGREDIENTS
   =========================== */
.ingredients-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.ingredient-item {
  border: 1px solid var(--border-color); border-radius: var(--radius-sm);
  overflow: hidden; transition: var(--transition);
}
.ingredient-item:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.ingredient-img {
  width: 100%; aspect-ratio: 1; background: var(--bg-gray);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-light); font-size: 0.85rem;
}
.ingredient-info { padding: 12px; }
.ingredient-info h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 4px; }
.ingredient-info .brand { font-size: 0.8rem; color: var(--text-light); margin-bottom: 8px; }
.ingredient-info .more-link { font-size: 0.8rem; color: var(--primary); font-weight: 500; }
.category-tags {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-bottom: 32px; justify-content: center;
}
.category-tag {
  padding: 6px 18px; border-radius: 50px;
  border: 1px solid var(--border-color); font-size: 0.85rem;
  font-weight: 500; color: var(--text-muted);
  cursor: pointer; transition: var(--transition);
}
.category-tag:hover, .category-tag.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===========================
   NEWS
   =========================== */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-card {
  border: 1px solid var(--border-color); border-radius: var(--radius);
  overflow: hidden; transition: var(--transition);
}
.news-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.news-img {
  width: 100%; aspect-ratio: 16/9; background: var(--bg-gray);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-light); font-size: 0.85rem;
}
.news-content { padding: 20px; }
.news-content h4 { font-size: 1rem; font-weight: 600; line-height: 1.4; transition: var(--transition); }
.news-card:hover .news-content h4 { color: var(--primary); }
.view-all-news { text-align: center; margin-top: 40px; }
.view-all-news a {
  color: var(--primary); font-weight: 600;
  display: inline-flex; align-items: center; gap: 6px; transition: var(--transition);
}
.view-all-news a:hover { gap: 12px; }

/* ===========================
   PAGE HEADER (Contact, etc.)
   =========================== */
.page-header {
  padding-top: 72px;
  background: linear-gradient(135deg, var(--primary-light), #f0fdfa);
  text-align: center;
  padding-bottom: 56px;
}
.page-header .container {
  padding-top: 48px;
  padding-bottom: 48px;
}
.page-header h1 {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-dark);
}
.page-header p {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 auto;
}

/* ===========================
   CONTACT INFO CARDS
   =========================== */
.contact-info-section {
  padding: 64px 0;
}
.contact-info-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.contact-info-card {
  text-align: center;
  padding: 28px 20px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-white);
  transition: var(--transition);
}
.contact-info-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.contact-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: var(--primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}
.contact-info-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.contact-info-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}
.contact-info-card a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}
.contact-info-card a:hover {
  text-decoration: underline;
}

/* ===========================
   CONTACT FORM
   =========================== */
.contact-form-section {
  background: var(--bg-light);
  padding: 64px 0 80px;
}
.form-wrapper {
  max-width: 760px;
  margin: 0 auto;
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 48px 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
}
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-group label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-dark);
}
.form-group label .required {
  color: #e53e3e;
}
.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  transition: var(--transition);
  background: #fff;
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 176, 173, 0.12);
}
.form-group input.error,
.form-group select.error,
.form-group textarea.error {
  border-color: #e53e3e;
}
.form-group .field-error {
  font-size: 0.8rem;
  color: #e53e3e;
  display: none;
}
.form-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 4px;
}
.form-note {
  font-size: 0.82rem;
  color: var(--text-muted);
}
.form-note a {
  color: var(--primary);
  text-decoration: underline;
}
.btn-submit {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 40px;
  font-size: 1rem;
}
.btn-submit.loading {
  pointer-events: none;
  opacity: 0.7;
}
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
.form-feedback {
  text-align: center;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.92rem;
  margin-top: 8px;
}
.form-feedback.success {
  background: #f0fdf4;
  color: #166534;
  border: 1px solid #bbf7d0;
}
.form-feedback.error-msg {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* ===========================
   FOOTER
   =========================== */
.footer {
  background: #1a1a2e; color: rgba(255,255,255,0.8);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px; padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .logo { color: #fff; margin-bottom: 16px; }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 320px; opacity: 0.7; }
.footer-col h4 { color: #fff; font-size: 1rem; font-weight: 700; margin-bottom: 20px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 0.9rem; opacity: 0.7; transition: var(--transition); }
.footer-col ul li a:hover { opacity: 1; color: var(--primary); }

/* Social icons */
.footer-social { display: flex; gap: 12px; margin-top: 16px; }
.social-link {
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(255,255,255,0.1); display: flex;
  align-items: center; justify-content: center;
  color: rgba(255,255,255,0.7); transition: var(--transition);
}
.social-link:hover { background: var(--primary); color: #fff; }
.footer-bottom { text-align: center; padding: 24px 0; font-size: 0.85rem; opacity: 0.5; }

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; text-align: center; }
  .hero-content p { margin: 0 auto 36px; }
  .hero-buttons { justify-content: center; }
  .hero-image { display: none; }
  .products-grid { grid-template-columns: repeat(3, 1fr); }
  .feature-grid, .why-grid { grid-template-columns: 1fr; }
  .ingredients-grid { grid-template-columns: repeat(3, 1fr); }
  .about-cards { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 24px; gap: 16px;
    border-bottom: 1px solid var(--border-color); box-shadow: var(--shadow-md);
  }
  .nav-links.open { display: flex; }
  .menu-toggle { display: flex; }
  .hero-content h1 { font-size: 2.2rem; }
  .section-title { font-size: 1.6rem; }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .services-grid, .steps-grid, .news-grid, .about-cards { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; gap: 24px; }
  .ingredients-grid { grid-template-columns: repeat(2, 1fr); }
  .why-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .products-grid { grid-template-columns: 1fr; }
  .hero-content h1 { font-size: 1.8rem; }
  .section { padding: 48px 0; }
  .section-title { font-size: 1.4rem; }
  .container { padding: 0 16px; }
  .footer-grid { gap: 24px; }
  .news-grid { gap: 16px; }
  .ingredients-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .category-tags { gap: 6px; }
  .category-tag { font-size: 0.78rem; padding: 4px 12px; }
  .stats-grid { gap: 16px; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .hero-buttons .btn { width: 100%; justify-content: center; }
}