/* =========================================================
   YIKA — Smart Robotic Lawn Mowers
   Static official website stylesheet
   ========================================================= */

/* ---------- Design tokens ---------- */
:root {
  --green-900: #0f3d28;
  --green-800: #14532d;
  --green-700: #166534;
  --green-500: #22c55e;
  --green-400: #4ade80;
  --green-200: #bbf7d0;
  --ink: #0f172a;
  --slate: #475569;
  --slate-soft: #64748b;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-alt: #f6faf7;
  --bg-dark: #0b1f17;
  --radius: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06), 0 1px 3px rgba(15, 23, 42, .04);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, .08);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, .12);
  --container: 1160px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: .01em;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease), color .25s var(--ease);
  white-space: nowrap;
}
.btn-primary { background: var(--green-700); color: #fff; box-shadow: 0 8px 20px rgba(22, 101, 52, .25); }
.btn-primary:hover { background: var(--green-800); transform: translateY(-2px); box-shadow: 0 12px 26px rgba(22, 101, 52, .32); }
.btn-ghost { background: transparent; color: var(--ink); border: 1.5px solid var(--line); }
.btn-ghost:hover { border-color: var(--green-700); color: var(--green-700); transform: translateY(-2px); }
.btn-sm { padding: 10px 18px; font-size: 14px; }
.btn-block { width: 100%; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand-mark { display: inline-flex; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-size: 18px; letter-spacing: .14em; color: var(--green-800); }
.brand-text small { font-size: 11px; color: var(--slate-soft); letter-spacing: .02em; }

.nav { display: flex; gap: 30px; }
.nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--slate);
  position: relative;
  padding: 6px 0;
  transition: color .2s var(--ease);
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--green-500);
  transition: width .25s var(--ease);
}
.nav a:hover { color: var(--ink); }
.nav a:hover::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: 14px; }
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  font-weight: 600;
  color: var(--slate-soft);
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.lang-toggle:hover { border-color: var(--green-400); }
.lang-toggle .lang-opt.active { color: var(--green-700); }
.lang-sep { color: var(--line); }

.menu-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.menu-toggle span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .3s var(--ease), opacity .3s var(--ease); }
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 110px 0 120px; }
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(1100px 460px at 78% -10%, rgba(34, 197, 94, .20), transparent 60%),
    radial-gradient(800px 420px at 8% 20%, rgba(22, 101, 52, .14), transparent 55%),
    linear-gradient(180deg, #f3faf5 0%, #ffffff 70%);
}
.hero-inner { position: relative; max-width: 820px; }
.eyebrow {
  display: inline-block;
  margin: 0 0 18px;
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--green-700);
  background: var(--green-200);
  border-radius: 999px;
}
.hero-title {
  margin: 0 0 22px;
  font-size: clamp(2.3rem, 5.2vw, 3.7rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--ink);
}
.hero-title span { display: block; }
.hero-title span:last-child { color: var(--green-700); }
.hero-sub {
  margin: 0 0 36px;
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  color: var(--slate);
  max-width: 660px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }

/* ---------- Stats ---------- */
.stats { background: var(--bg-dark); color: #fff; }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 52px 24px;
}
.stat { text-align: center; }
.stat-num {
  display: block;
  font-size: clamp(1.15rem, 2.1vw, 1.5rem);
  font-weight: 800;
  color: var(--green-400);
  letter-spacing: -.01em;
  line-height: 1.2;
}
.stat-label { display: block; margin-top: 8px; color: #c7d8cf; font-size: 13px; }

/* ---------- Sections ---------- */
.section { padding: 100px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { max-width: 760px; margin: 0 auto 56px; text-align: center; }
.section-title {
  margin: 12px 0 14px;
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.2;
}
.section-sub { margin: 0; color: var(--slate); font-size: 1.05rem; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; align-items: start; }
.about-lead .section-title { margin-top: 12px; text-align: left; }
.about-body p { margin: 0 0 18px; color: var(--slate); }
.legal-name-card {
  margin-top: 30px;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--green-500);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow-sm);
}
.legal-row { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: baseline; padding: 8px 0; }
.legal-row + .legal-row { border-top: 1px dashed var(--line); }
.legal-label { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--slate-soft); min-width: 150px; }
.legal-row strong { font-size: 15px; color: var(--ink); }

/* ---------- Products ---------- */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.product-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
  display: flex;
  flex-direction: column;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--green-200); }
.product-media {
  background: linear-gradient(145deg, #e8f5ee, #f6faf7);
  display: flex; align-items: center; justify-content: center;
  padding: 34px 24px;
  border-bottom: 1px solid var(--line);
}
.product-svg { width: 100%; max-width: 220px; height: auto; }
.product-body { padding: 26px 24px 30px; }
.product-body h3 { margin: 0 0 10px; font-size: 1.22rem; font-weight: 700; color: var(--ink); }
.product-body p { margin: 0 0 16px; color: var(--slate); font-size: .96rem; }
.feature-list { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 14px; }
.feature-list li {
  position: relative;
  padding-left: 20px;
  font-size: .9rem;
  color: var(--slate);
}
.feature-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 12px; height: 12px;
  background: var(--green-500);
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M5 13l4 4L19 7' fill='none' stroke='black' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/></svg>") center / contain no-repeat;
          mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M5 13l4 4L19 7' fill='none' stroke='black' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/></svg>") center / contain no-repeat;
  border-radius: 4px;
}

/* ---------- Advantages ---------- */
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.adv-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 24px;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.adv-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.adv-icon {
  width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 14px;
  background: linear-gradient(145deg, var(--green-200), #dcfce7);
  color: var(--green-700);
  margin-bottom: 18px;
}
.adv-card h3 { margin: 0 0 8px; font-size: 1.08rem; font-weight: 700; }
.adv-card p { margin: 0; color: var(--slate); font-size: .94rem; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: start; }
.contact-info .section-title { text-align: left; margin-top: 12px; }
.contact-info .section-sub { margin-bottom: 30px; }
.contact-list { display: flex; flex-direction: column; gap: 4px; }
.contact-list li {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.ci-label { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--slate-soft); }
.ci-value { color: var(--ink); font-size: .98rem; word-break: break-word; }
.ci-link { color: var(--green-700); font-weight: 600; }
.ci-link:hover { text-decoration: underline; }

.contact-form-wrap {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
}
.contact-form .field { margin-bottom: 18px; }
.contact-form label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 7px; color: var(--ink); }
.contact-form input, .contact-form textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  font: inherit;
  color: var(--ink);
  background: #fbfdfb;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.contact-form input:focus, .contact-form textarea:focus {
  outline: none;
  border-color: var(--green-500);
  box-shadow: 0 0 0 4px rgba(34, 197, 94, .14);
}
.contact-form textarea { resize: vertical; min-height: 110px; }
.form-note { margin: 12px 0 0; font-size: 12px; color: var(--slate-soft); text-align: center; }

/* ---------- Footer ---------- */
.site-footer { background: var(--bg-dark); color: #c7d8cf; padding: 56px 0 28px; }
.footer-inner { display: flex; justify-content: space-between; gap: 30px; flex-wrap: wrap; align-items: center; }
.footer-brand { display: flex; gap: 12px; align-items: center; }
.footer-brand strong { color: #fff; letter-spacing: .14em; font-size: 17px; }
.footer-brand p { margin: 4px 0 0; font-size: 12.5px; line-height: 1.55; color: #9fb3aa; }
.footer-nav { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-nav a { font-size: 14px; color: #c7d8cf; transition: color .2s var(--ease); }
.footer-nav a:hover { color: var(--green-400); }
.footer-bottom {
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  margin-top: 36px; padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, .08);
  font-size: 13px;
  color: #8fa49a;
}
.footer-icp { margin: 0; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .product-grid { grid-template-columns: 1fr 1fr; }
  .adv-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 30px 16px; }
}

@media (max-width: 760px) {
  .nav, .cta-nav { display: none; }
  .menu-toggle { display: flex; }
  .nav {
    position: absolute;
    top: 72px; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
    padding: 8px 24px 16px;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .25s var(--ease), transform .25s var(--ease);
  }
  .nav.open { opacity: 1; transform: none; pointer-events: auto; }
  .nav a { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .nav a:last-child { border-bottom: none; }
  .section { padding: 70px 0; }
  .hero { padding: 70px 0 80px; }
  .feature-list { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .legal-label { min-width: auto; }
  .contact-list li { grid-template-columns: 1fr; gap: 2px; }
}

@media (max-width: 520px) {
  .product-grid { grid-template-columns: 1fr; }
  .adv-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-actions .btn { width: 100%; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}