/* =========================================================
   ShangMeals — Marketing Site Stylesheet
   Pure CSS, mobile-first, no framework.
   Palette aligned with the merchant admin app:
     primary #458D67 (brand green), dark #304156 (sidebar),
     accent #c86a73 (selection pink), fonts Arial-family.
   ========================================================= */

:root {
  --primary: #458D67;
  --primary-dark: #3A7555;
  --primary-light: #EAF5EE;
  --accent: #c86a73;
  --text: #1f2d3d;
  --text-light: #555555;
  --text-muted: #707070;
  --bg: #FFFFFF;
  --bg-alt: #F8F9FA;
  --border: #E6EBF5;
  --border-dark: #DFE4ED;
  --footer-bg: #304156;
  --footer-dark: #1f2d3d;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10);
  --container: 1140px;
  --header-h: 64px;
  --font: Arial, "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* ---------------- Reset ---------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 0.5em; font-weight: 700; color: var(--text); }
h1 { font-size: clamp(2rem, 5vw, 3.25rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); letter-spacing: -0.01em; }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1rem; }
ul { margin: 0 0 1rem; padding-left: 1.25rem; }

/* ---------------- Layout ---------------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0; }
.section--alt { background: var(--bg-alt); }
.section--tight { padding: 48px 0; }
.center { text-align: center; }
.lead { font-size: 1.125rem; color: var(--text-muted); max-width: 640px; }
.lead.center { margin-left: auto; margin-right: auto; }
.eyebrow {
  display: inline-block; font-size: 0.8rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--primary); background: var(--primary-light);
  padding: 4px 12px; border-radius: 999px; margin-bottom: 16px;
}

/* ---------------- Header ---------------- */
.site-header {
  position: sticky; top: 0; z-index: 100; height: var(--header-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-header .container { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 1.25rem; color: var(--text); }
.brand-logo {
  width: 30px; height: 30px;
  vertical-align: middle;
  display: block;
}
.brand:hover { color: var(--text); }

.nav { display: flex; align-items: center; gap: 28px; }
.nav a { color: var(--text); font-weight: 500; font-size: 0.95rem; }
.nav a:hover { color: var(--primary); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 600; font-size: 0.95rem; padding: 11px 22px;
  border-radius: var(--radius-sm); border: 1px solid transparent;
  cursor: pointer; font-family: inherit;
  transition: background .15s, color .15s, border-color .15s, transform .1s;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--primary); color: #fff; }
.btn--primary:hover { background: var(--primary-dark); color: #fff; }
.btn--outline { border-color: var(--border-dark); color: var(--text); background: #fff; }
.btn--outline:hover { border-color: var(--primary); color: var(--primary); }
.btn--ghost { color: var(--text); padding: 8px 0; }
.btn--ghost:hover { color: var(--primary); }
.btn--lg { padding: 14px 28px; font-size: 1rem; }
.btn--block { width: 100%; }

/* ---------------- Hero ---------------- */
.hero { padding: 80px 0 64px; background: linear-gradient(180deg, var(--primary-light) 0%, #fff 100%); }
.hero__grid { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 24px; }
.hero h1 { margin: 0; }
.hero .lead { margin: 0 auto; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.hero__badge { color: var(--text-muted); font-size: 0.875rem; }

/* ---------------- Features ---------------- */
.grid { display: grid; gap: 24px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow);
  transition: transform .15s, box-shadow .15s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.card__icon {
  width: 48px; height: 48px; display: flex; align-items: center; justify-content: center;
  background: var(--primary-light); color: var(--primary);
  border-radius: var(--radius-sm); font-size: 1.5rem; margin-bottom: 16px;
}
.card h3 { margin-bottom: 8px; }
.card p { color: var(--text-light); margin: 0; }

/* ---------------- Steps ---------------- */
.steps { counter-reset: step; display: grid; gap: 24px; grid-template-columns: repeat(3, 1fr); }
.step { position: relative; padding: 28px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); }
.step::before {
  counter-increment: step; content: counter(step);
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--primary); color: #fff; font-weight: 700; margin-bottom: 16px;
}
.step h3 { margin-bottom: 8px; }
.step p { color: var(--text-light); margin: 0; }

/* ---------------- Split (text + visual) ---------------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.split__visual {
  background: var(--primary-light); border-radius: var(--radius);
  min-height: 280px; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border);
}
.phone-mock {
  width: 220px; height: 440px; background: #fff;
  border-radius: 28px; border: 8px solid var(--footer-dark);
  box-shadow: var(--shadow-lg);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  color: var(--text-muted); font-size: 0.875rem; text-align: center; padding: 20px;
}
.phone-mock strong { color: var(--primary); display: block; margin-bottom: 8px; font-size: 1rem; }

/* ---------------- CTA band ---------------- */
.cta-band { background: var(--primary); color: #fff; border-radius: var(--radius); padding: 48px; text-align: center; }
.cta-band h2 { color: #fff; }
.cta-band p { color: rgba(255,255,255,0.9); max-width: 560px; margin: 0 auto 24px; }
.cta-band .btn--primary { background: #fff; color: var(--primary); }
.cta-band .btn--primary:hover { background: #f1f1f1; color: var(--primary-dark); }

/* ---------------- FAQ ---------------- */
.faq { max-width: 760px; margin: 0 auto; }
.faq__item { border-bottom: 1px solid var(--border); padding: 20px 0; }
.faq__item summary { list-style: none; cursor: pointer; font-size: 1.05rem; font-weight: 600; display: flex; justify-content: space-between; align-items: center; }
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after { content: "+"; color: var(--primary); font-weight: 400; font-size: 1.25rem; transition: transform .2s; }
.faq__item[open] summary::after { transform: rotate(45deg); }
.faq__item p { color: var(--text-light); margin: 12px 0 0; }

/* ---------------- Forms ---------------- */
.form-card { max-width: 560px; margin: 0 auto; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); }
.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 700; font-size: 0.9rem; margin-bottom: 6px; color: var(--text); }
.field input, .field textarea, .field select {
  width: 100%; padding: 11px 14px; border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm); font-size: 1rem; font-family: inherit;
  background: #fff; color: var(--text);
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.field textarea { min-height: 120px; resize: vertical; }
.form-note { font-size: 0.85rem; color: var(--text-muted); margin-top: 12px; }
.form-success { display: none; background: var(--primary-light); color: var(--primary-dark); border-radius: var(--radius-sm); padding: 12px 16px; margin-top: 12px; font-weight: 600; }

/* ---------------- Prose (legal pages) ---------------- */
.prose { max-width: 760px; margin: 0 auto; }
.prose h1 { margin-bottom: 8px; }
.prose .meta { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 32px; }
.prose h2 { font-size: 1.4rem; margin-top: 40px; }
.prose h3 { font-size: 1.1rem; margin-top: 28px; }
.prose p, .prose li { color: var(--text); }
.prose ul { color: var(--text-light); }
.prose table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 0.95rem; }
.prose th, .prose td { border: 1px solid var(--border-dark); padding: 10px 14px; text-align: left; }
.prose th { background: var(--bg-alt); }
.prose .callout { background: var(--primary-light); border-left: 3px solid var(--primary); padding: 16px 20px; border-radius: var(--radius-sm); margin: 20px 0; }
.callout--info { background: #EEF6FF; border-color: #3B82F6; }
.placeholder { background: #FFF3CD; color: #8A6D3B; padding: 2px 6px; border-radius: 4px; font-size: 0.85em; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

/* ---------------- Footer ---------------- */
.site-footer { background: var(--footer-bg); color: #bfcbd9; padding: 56px 0 24px; }
.site-footer .container { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 32px; }
.site-footer h4 { color: #fff; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 16px; }
.site-footer a { color: #bfcbd9; display: block; padding: 4px 0; font-size: 0.95rem; }
.site-footer a:hover { color: #fff; }
.site-footer .brand { color: #fff; margin-bottom: 12px; }
.site-footer .brand .logo-dot { background: var(--footer-dark); border-color: var(--primary); color: #fff; }
.footer-about p { color: #9CA3AF; font-size: 0.9rem; }
.footer-bottom { grid-column: 1 / -1; border-top: 1px solid var(--footer-dark); margin-top: 32px; padding-top: 24px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; font-size: 0.85rem; color: #9CA3AF; }

/* ---------------- Mobile menu ---------------- */
.nav-toggle { display: none; background: none; border: 1px solid var(--border-dark); border-radius: var(--radius-sm); padding: 10px; cursor: pointer; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after { display: block; width: 20px; height: 2px; background: var(--text); position: relative; }
.nav-toggle span::before, .nav-toggle span::after { content: ""; position: absolute; left: 0; }
.nav-toggle span::before { top: -6px; } .nav-toggle span::after { top: 6px; }

/* ---------------- Responsive ---------------- */
@media (max-width: 900px) {
  .grid--3, .steps { grid-template-columns: 1fr; }
  .grid--2 { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; }
  .split__visual { order: -1; min-height: 200px; }
  .site-footer .container { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    background: #fff; flex-direction: column; gap: 0;
    border-bottom: 1px solid var(--border); padding: 8px 20px 16px;
    transform: translateY(-130%); transition: transform .25s ease;
    box-shadow: var(--shadow-lg);
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 12px 0; width: 100%; border-bottom: 1px solid var(--border); }
  .nav .btn { margin-top: 12px; }
  .section { padding: 56px 0; }
  .cta-band { padding: 32px 20px; }
  .site-footer .container { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
}