/* ==========================================================================
   Miiyia — global stylesheet
   A clean, professional design system for the Miiyia SaaS marketing site.
   ========================================================================== */

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f6f8fc;
  --color-bg-dark: #0d1b2a;
  --color-surface: #ffffff;
  --color-border: #e3e8f0;
  --color-text: #1b2430;
  --color-text-muted: #5a6473;
  --color-primary: #1d6fe0;
  --color-primary-dark: #1556b0;
  --color-primary-soft: #e8f1fd;
  --color-accent: #7b61ff;          /* distinct indigo-violet (intentionally not Amazon orange) */
  --color-success: #1f9d63;
  --color-warning: #d98300;

  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(16, 33, 60, 0.06);
  --shadow: 0 6px 24px rgba(16, 33, 60, 0.08);
  --shadow-lg: 0 18px 48px rgba(16, 33, 60, 0.14);

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;

  --maxw: 1140px;
  --header-h: 68px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* --- Bilingual visibility ------------------------------------------------ */
html.lang-en [data-lang="zh"] { display: none !important; }
html.lang-zh [data-lang="en"] { display: none !important; }

/* --- Typography ---------------------------------------------------------- */
h1, h2, h3, h4 { color: var(--color-text); line-height: 1.25; margin: 0 0 .6em; font-weight: 700; }
h1 { font-size: clamp(2rem, 4.5vw, 3rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); letter-spacing: -0.01em; }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1rem; color: var(--color-text-muted); }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { color: var(--color-text-muted); }
strong { color: var(--color-text); }
code { background: var(--color-bg-alt); padding: 2px 6px; border-radius: 4px; font-size: .9em; }

/* --- Layout -------------------------------------------------------------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 72px 0; }
.section-alt { background: var(--color-bg-alt); }
.section-sm { padding: 48px 0; }
.center { text-align: center; }
.lead { font-size: 1.15rem; color: var(--color-text-muted); max-width: 720px; }
.center .lead { margin-left: auto; margin-right: auto; }
.eyebrow {
  display: inline-block; text-transform: uppercase; letter-spacing: .08em;
  font-size: .78rem; font-weight: 700; color: var(--color-primary);
  background: var(--color-primary-soft); padding: 5px 12px; border-radius: 999px; margin-bottom: 16px;
}

/* --- Buttons ------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  padding: 12px 22px; border-radius: var(--radius-sm); font-weight: 600; font-size: .98rem;
  cursor: pointer; border: 1px solid transparent; transition: all .15s ease; text-decoration: none;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--color-primary-dark); color: #fff; }
.btn-ghost { background: transparent; color: var(--color-text); border-color: var(--color-border); }
.btn-ghost:hover { background: var(--color-bg-alt); color: var(--color-text); }
.btn-lg { padding: 15px 30px; font-size: 1.05rem; }

/* --- Header -------------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.88);
  backdrop-filter: saturate(180%) blur(12px); border-bottom: 1px solid var(--color-border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.2rem; color: var(--color-text); }
.brand:hover { text-decoration: none; }
.brand .logo { width: 30px; height: 30px; }
.nav-links { display: flex; align-items: center; gap: 26px; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--color-text); font-weight: 500; font-size: .95rem; }
.nav-links a:hover { color: var(--color-primary); text-decoration: none; }
.nav-right { display: flex; align-items: center; gap: 14px; }
.lang-toggle {
  display: inline-flex; border: 1px solid var(--color-border); border-radius: 999px; overflow: hidden;
  background: var(--color-bg-alt);
}
.lang-toggle button {
  border: 0; background: transparent; padding: 6px 12px; font-size: .85rem; font-weight: 600;
  cursor: pointer; color: var(--color-text-muted); font-family: inherit;
}
.lang-toggle button.active { background: var(--color-primary); color: #fff; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--color-text); margin: 4px 0; transition: .2s; }

/* --- Hero ---------------------------------------------------------------- */
.hero { padding: 88px 0 72px; background:
  radial-gradient(1200px 400px at 80% -10%, var(--color-primary-soft), transparent),
  linear-gradient(180deg, #fff, var(--color-bg-alt)); }
.hero h1 { max-width: 760px; }
.hero .lead { margin-top: 8px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; }
.hero-note { margin-top: 18px; font-size: .9rem; color: var(--color-text-muted); }

/* --- Cards / grids ------------------------------------------------------- */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow-sm); transition: box-shadow .2s, transform .2s;
}
.card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.card .icon {
  width: 46px; height: 46px; border-radius: 10px; display: grid; place-items: center;
  background: var(--color-primary-soft); color: var(--color-primary); margin-bottom: 16px;
}
.card h3 { margin-bottom: 8px; }
.card p { margin-bottom: 0; font-size: .96rem; }

/* --- Stats --------------------------------------------------------------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat .num { font-size: 2.2rem; font-weight: 800; color: var(--color-primary); }
.stat .label { color: var(--color-text-muted); font-size: .95rem; }

/* --- Steps --------------------------------------------------------------- */
.steps { display: grid; gap: 20px; }
.step { display: flex; gap: 18px; align-items: flex-start; }
.step .n {
  flex: 0 0 auto; width: 38px; height: 38px; border-radius: 50%; background: var(--color-primary);
  color: #fff; font-weight: 700; display: grid; place-items: center;
}
.step h3 { margin-bottom: 4px; }
.step p { margin-bottom: 0; }

/* --- Pricing ------------------------------------------------------------- */
.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; align-items: stretch; }
.plan { display: flex; flex-direction: column; }
.plan.featured { border-color: var(--color-primary); box-shadow: var(--shadow); position: relative; }
.plan .badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--color-primary); color: #fff; font-size: .75rem; font-weight: 700;
  padding: 4px 12px; border-radius: 999px;
}
.plan .price { font-size: 2.2rem; font-weight: 800; color: var(--color-text); margin: 8px 0 2px; }
.plan .price span { font-size: 1rem; font-weight: 500; color: var(--color-text-muted); }
.plan ul { list-style: none; padding: 0; margin: 18px 0; flex: 1; }
.plan li { padding: 7px 0 7px 26px; position: relative; font-size: .95rem; }
.plan li::before { content: "✓"; position: absolute; left: 0; color: var(--color-success); font-weight: 700; }

/* --- Legal / prose pages ------------------------------------------------- */
.prose { max-width: 820px; }
.prose h2 { margin-top: 2.2rem; font-size: 1.5rem; }
.prose h3 { margin-top: 1.6rem; }
.prose p, .prose li { color: var(--color-text); }
.prose li { margin-bottom: 6px; }
.prose table { width: 100%; border-collapse: collapse; margin: 1.2rem 0; }
.prose th, .prose td { border: 1px solid var(--color-border); padding: 10px 12px; text-align: left; font-size: .94rem; vertical-align: top; }
.prose th { background: var(--color-bg-alt); }
.doc-meta { color: var(--color-text-muted); font-size: .92rem; margin-bottom: 2rem; padding-bottom: 1rem; border-bottom: 1px solid var(--color-border); }
.callout {
  background: var(--color-primary-soft); border-left: 4px solid var(--color-primary);
  padding: 16px 20px; border-radius: var(--radius-sm); margin: 1.4rem 0;
}
.callout p { color: var(--color-text); margin: 0; }

/* --- Contact / forms ----------------------------------------------------- */
.form-row { margin-bottom: 18px; }
.form-row label { display: block; font-weight: 600; font-size: .92rem; margin-bottom: 6px; }
.form-row input, .form-row select, .form-row textarea {
  width: 100%; padding: 11px 14px; border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  font-family: inherit; font-size: .96rem; background: #fff; color: var(--color-text);
}
.form-row textarea { min-height: 140px; resize: vertical; }
.form-note { font-size: .85rem; color: var(--color-text-muted); }
.contact-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; }
.info-list { list-style: none; padding: 0; margin: 0; }
.info-list li { padding: 12px 0; border-bottom: 1px solid var(--color-border); }
.info-list .k { font-size: .82rem; text-transform: uppercase; letter-spacing: .05em; color: var(--color-text-muted); }
.info-list .v { font-weight: 600; }

/* --- FAQ ----------------------------------------------------------------- */
.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius); margin-bottom: 14px; background: #fff; overflow: hidden; }
.faq-item summary { padding: 18px 22px; font-weight: 600; cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; color: var(--color-primary); font-size: 1.3rem; line-height: 1; }
.faq-item[open] summary::after { content: "−"; }
.faq-item .body { padding: 0 22px 20px; color: var(--color-text-muted); }

/* --- CTA band ------------------------------------------------------------ */
.cta-band { background: var(--color-bg-dark); color: #fff; border-radius: var(--radius-lg); padding: 56px 48px; text-align: center; }
.cta-band h2 { color: #fff; }
.cta-band p { color: #c7d2e0; max-width: 620px; margin: 0 auto 24px; }

/* --- Footer -------------------------------------------------------------- */
.site-footer { background: var(--color-bg-dark); color: #c7d2e0; padding: 56px 0 28px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; }
.site-footer .brand { color: #fff; margin-bottom: 12px; }
.site-footer p { color: #93a2b5; font-size: .92rem; }
.footer-col h4 { color: #fff; font-size: .92rem; text-transform: uppercase; letter-spacing: .05em; margin-bottom: 14px; }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 9px; }
.footer-col a { color: #93a2b5; font-size: .93rem; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 40px; padding-top: 22px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: .88rem; color: #7d8da1; }
.footer-disclaimer { font-size: .82rem; color: #6c7c91; margin-top: 14px; max-width: 760px; }

/* --- Page hero (interior) ------------------------------------------------ */
.page-hero { padding: 64px 0 40px; background: linear-gradient(180deg, var(--color-bg-alt), #fff); border-bottom: 1px solid var(--color-border); }
.page-hero h1 { margin-bottom: 12px; }

/* --- Utilities ----------------------------------------------------------- */
.mt-0 { margin-top: 0; } .mb-0 { margin-bottom: 0; }
.tag { display: inline-block; font-size: .8rem; font-weight: 600; color: var(--color-primary);
  background: var(--color-primary-soft); padding: 3px 10px; border-radius: 999px; margin: 0 6px 6px 0; }
.divider { height: 1px; background: var(--color-border); border: 0; margin: 0; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }

/* --- Responsive ---------------------------------------------------------- */
@media (max-width: 900px) {
  .grid-3, .grid-4, .price-grid, .stats { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .two-col, .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .nav-links { position: fixed; top: var(--header-h); left: 0; right: 0; background: #fff;
    flex-direction: column; align-items: stretch; gap: 0; padding: 8px 0; border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow); transform: translateY(-150%); transition: transform .25s ease; }
  .nav-links.open { transform: translateY(0); }
  .nav-links li { padding: 4px 24px; }
  .nav-toggle { display: block; }
  .grid-2, .grid-3, .grid-4, .price-grid, .stats { grid-template-columns: 1fr; }
  .cta-band { padding: 40px 24px; }
  .section { padding: 52px 0; }
}