/* ============================================================
   康樂齡 kangleling.com — main.css
   Plain CSS, no framework. CSS custom properties throughout.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700&display=swap');

/* ---------- Custom Properties ---------- */
:root {
  --color-primary:   #E8633A;
  --color-secondary: #2C5F2E;
  --color-bg:        #FAFAF8;
  --color-text:      #1A1A1A;
  --color-surface:   #FFFFFF;
  --color-border:    #E5E5E0;
  --color-wechat:    #07C160;
  --color-muted:     #6B7280;

  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --radius:    8px;
  --radius-lg: 16px;
  --shadow:    0 2px 12px rgba(0,0,0,0.07);
  --shadow-md: 0 4px 24px rgba(0,0,0,0.10);

  --max-width: 1100px;
  --gutter:    24px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  font-size: 16px;
}
img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; }

/* ---------- Layout ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.section { padding: 72px 0; }
.section--alt { background: var(--color-surface); }

/* ---------- Typography ---------- */
h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: 1.3rem; }
h4 { font-size: 1.1rem; }
p  { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }
.text-muted { color: var(--color-muted); font-size: 0.9rem; }
.text-center { text-align: center; }

/* ---------- Navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.nav__logo img,
.nav__logo svg { height: 40px; width: auto; }
.nav__logo span {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}
.nav__links {
  display: flex;
  gap: 32px;
  align-items: center;
}
.nav__links a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}
.nav__links a:hover,
.nav__links a.active { color: var(--color-primary); text-decoration: none; }
.nav__cta {
  background: var(--color-wechat);
  color: #fff !important;
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 0.88rem !important;
  transition: opacity 0.2s;
}
.nav__cta:hover { opacity: 0.88; text-decoration: none !important; }

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}
.nav__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all 0.3s;
}
.nav__mobile {
  display: none;
  flex-direction: column;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 16px var(--gutter);
  gap: 16px;
}
.nav__mobile a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 1rem;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}
.nav__mobile.open { display: flex; }

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__hamburger { display: flex; }
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, #FFF5F0 0%, #FFF8F4 60%, #F0F7F0 100%);
  padding: 96px 0 80px;
  text-align: center;
}
.hero__eyebrow {
  display: inline-block;
  background: #FDE8DF;
  color: var(--color-primary);
  padding: 4px 14px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: 0.03em;
}
.hero h1 { color: var(--color-text); margin-bottom: 16px; }
.hero h1 em {
  font-style: normal;
  color: var(--color-primary);
}
.hero__subtitle {
  font-size: 1.15rem;
  color: var(--color-muted);
  margin-bottom: 12px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}
.hero__tagline {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 40px;
}
.hero__cta-group {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  text-align: center;
}
.btn--primary {
  background: var(--color-primary);
  color: #fff;
}
.btn--primary:hover { background: #d4522b; text-decoration: none; color: #fff; }
.btn--outline {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}
.btn--outline:hover { background: var(--color-primary); color: #fff; text-decoration: none; }
.btn--wechat {
  background: var(--color-wechat);
  color: #fff;
}
.btn--wechat:hover { background: #05a650; text-decoration: none; color: #fff; }
.btn--sm { padding: 8px 18px; font-size: 0.9rem; }

/* ---------- 4-CTA Grid ---------- */
.cta-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
}
@media (max-width: 900px) { .cta-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 500px) { .cta-grid { grid-template-columns: 1fr; } }

.cta-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.cta-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); text-decoration: none; color: var(--color-text); }
.cta-card__icon {
  width: 48px;
  height: 48px;
  background: #FDE8DF;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}
.cta-card__label { font-weight: 700; font-size: 1.05rem; }
.cta-card__desc { font-size: 0.85rem; color: var(--color-muted); }

/* ---------- Section Header ---------- */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-header h2 { margin-bottom: 12px; }
.section-header p { color: var(--color-muted); max-width: 560px; margin: 0 auto; }

/* ---------- Three-column Icon Grid ---------- */
.icon-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
@media (max-width: 768px) { .icon-grid { grid-template-columns: 1fr; } }

.icon-item {
  text-align: center;
  padding: 32px 20px;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}
.icon-item__icon {
  font-size: 2.4rem;
  margin-bottom: 16px;
  display: block;
}
.icon-item h3 { margin-bottom: 8px; font-size: 1.1rem; color: var(--color-secondary); }
.icon-item p { font-size: 0.92rem; color: var(--color-muted); margin: 0; }

/* ---------- Product Cards ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 900px) { .product-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .product-grid { grid-template-columns: 1fr; } }

.product-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow 0.2s;
}
.product-card:hover { box-shadow: var(--shadow-md); }
.product-card__badge {
  display: inline-block;
  background: #EBF7EB;
  color: var(--color-secondary);
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
}
.product-card h3 { font-size: 1.15rem; }
.product-card p { color: var(--color-muted); font-size: 0.9rem; flex: 1; }
.product-card .tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 4px;
}
.tag {
  background: #F3F4F6;
  color: #374151;
  padding: 2px 9px;
  border-radius: 100px;
  font-size: 0.78rem;
}

/* ---------- Highlight Bar ---------- */
.highlight-bar {
  background: linear-gradient(90deg, var(--color-secondary) 0%, #3a7a3c 100%);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 28px 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.highlight-bar p { margin: 0; font-size: 1.05rem; font-weight: 500; }
.highlight-bar a { color: #fff; text-decoration: underline; }

/* ---------- Standard Cards ---------- */
.standard-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 24px;
}
.standard-card__number {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.standard-card h3 { margin-bottom: 12px; color: var(--color-secondary); }
.standard-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
}
.standard-card__meaning {
  background: #F9FAFB;
  border-left: 3px solid var(--color-secondary);
  padding: 12px 16px;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--color-muted);
  font-size: 0.95rem;
}

/* ---------- Numbers / Stats ---------- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  text-align: center;
  margin: 40px 0;
}
@media (max-width: 600px) { .stats-row { grid-template-columns: 1fr; } }

.stat-item__number {
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 4px;
}
.stat-item__label { font-size: 0.9rem; color: var(--color-muted); }

/* ---------- Timeline ---------- */
.timeline {
  position: relative;
  padding-left: 32px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}
.timeline-item {
  position: relative;
  margin-bottom: 32px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -28px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid var(--color-surface);
  box-shadow: 0 0 0 2px var(--color-primary);
}
.timeline-item__year {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}
.timeline-item h4 { margin-bottom: 4px; }
.timeline-item p { color: var(--color-muted); font-size: 0.92rem; margin: 0; }

/* ---------- Callout / Info Box ---------- */
.callout {
  background: #EBF7EB;
  border: 1px solid #B6DDB8;
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin: 32px 0;
}
.callout h4 { color: var(--color-secondary); margin-bottom: 8px; }
.callout p { margin: 0; font-size: 0.95rem; color: #1F4E21; }

.callout--warning {
  background: #FFF8F0;
  border-color: #F5C9A0;
}
.callout--warning p { color: #7A3F12; }

.compliance-note {
  background: #FFF8F0;
  border: 1px solid #F5C9A0;
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 40px;
  font-size: 0.92rem;
  color: #7A3F12;
}

/* ---------- Process Steps ---------- */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 32px 0;
}
@media (max-width: 900px) { .process-steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 500px) { .process-steps { grid-template-columns: 1fr; } }

.process-step {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  text-align: center;
  position: relative;
}
.process-step__num {
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  margin: 0 auto 14px;
}
.process-step h4 { font-size: 0.95rem; margin-bottom: 6px; }
.process-step p { font-size: 0.85rem; color: var(--color-muted); margin: 0; }

/* ---------- Two-column layout ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
@media (max-width: 768px) { .two-col { grid-template-columns: 1fr; } }

.two-col-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.two-col-item h3 { color: var(--color-secondary); margin-bottom: 12px; }

/* ---------- Contact Form ---------- */
.contact-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 6px;
  color: var(--color-text);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(232,99,58,0.12);
}
.form-group textarea { min-height: 120px; resize: vertical; }
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 600px) { .form-row { grid-template-columns: 1fr; } }

/* ---------- WeChat CTA ---------- */
.wechat-cta {
  background: linear-gradient(90deg, #F0F9F0 0%, #E6F4E6 100%);
  border: 1px solid #B6DDB8;
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  display: flex;
  align-items: center;
  gap: 24px;
  margin: 48px 0 0;
}
.wechat-cta img {
  width: 80px;
  height: 80px;
  border-radius: var(--radius);
  flex-shrink: 0;
  object-fit: cover;
}
.wechat-cta__text strong {
  display: block;
  font-size: 1.1rem;
  color: var(--color-secondary);
  margin-bottom: 4px;
}
.wechat-cta__text p { color: #3A6B3C; font-size: 0.9rem; margin: 0; }

/* Mobile sticky WeChat bar */
@media (max-width: 768px) {
  .wechat-sticky {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 200;
    background: var(--color-wechat);
    color: #fff;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    box-shadow: 0 -2px 12px rgba(0,0,0,0.12);
  }
  .wechat-sticky__icon { font-size: 1.3rem; }
  body { padding-bottom: 56px; }
}
@media (min-width: 769px) { .wechat-sticky { display: none; } }

/* ---------- Footer ---------- */
.footer {
  background: #1A1A1A;
  color: #A0A09A;
  padding: 40px 0 28px;
  font-size: 0.88rem;
}
.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.footer__top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid #333;
  flex-wrap: wrap;
}
.footer__brand .brand-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}
.footer__brand p { margin: 0; line-height: 1.6; }
.footer__links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer__links a { color: #A0A09A; transition: color 0.2s; }
.footer__links a:hover { color: #fff; text-decoration: none; }
.footer__bottom {
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.footer__icp { color: #6B6B66; }

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  padding: 12px 0;
  font-size: 0.85rem;
  color: var(--color-muted);
}
.breadcrumb a { color: var(--color-muted); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb span { margin: 0 6px; }

/* ---------- Baidu note (hidden, SEO) ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* ---------- Utilities ---------- */
.mt-0  { margin-top: 0; }
.mt-8  { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }
.mb-0  { margin-bottom: 0; }
.mb-8  { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.mb-48 { margin-bottom: 48px; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }