@import url("https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.0/css/all.min.css");

/* ─── Design tokens ─── */
:root {
  --color-surface-background: #fff;
  --color-surface-elevated: #f9f9f9;
  --color-surface-muted: #ececec;
  --color-surface-sidebar: #f9f9f9;
  --color-surface-composer: #fff;
  --color-text-primary: #0d0d0d;
  --color-text-secondary: #5d5d5d;
  --color-text-tertiary: #8f8f8f;
  --color-text-placeholder: #000000b3;
  --color-text-link: #2964aa;
  --color-border-light: #0d0d0d0d;
  --color-border-default: #0d0d0d1a;
  --color-border-medium: #00000026;
  --color-border-heavy: #0d0d0d26;
  --color-action-primary-bg: #000;
  --color-action-primary-fg: #fff;
  --color-action-primary-bg-hover: #0d0d0dcc;
  --color-action-secondary-bg: #ececec;
  --color-action-secondary-fg: #0d0d0d;
  --color-action-accent: #0169cc;
  --color-action-brand-purple: #ab68ff;
  --radius-sm: .25rem; --radius-md: .375rem; --radius-lg: .5rem;
  --radius-xl: .75rem; --radius-2xl: 1rem; --radius-3xl: 1.5rem;
  --radius-4xl: 2rem; --radius-pill: 9999px;
  --font-size-xs: 12px; --font-size-sm: 13px; --font-size-base: 14px;
  --font-size-md: 16px; --font-size-lg: 18px; --font-size-2xl: 24px;
  --font-weight-normal: 400; --font-weight-medium: 500; --font-weight-semibold: 600;
  --font-sans: "-apple-system-body","ui-sans-serif","-apple-system","system-ui","Segoe UI","Helvetica","Arial",sans-serif;
  --font-mono: "ui-monospace","SFMono-Regular","SF Mono","Menlo","Consolas","Liberation Mono","monospace";
  --space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;
  --space-5:20px;--space-6:24px;--space-8:32px;--space-10:40px;--space-12:48px;
}

/* ─── Reset ─── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html,body{overflow-x:hidden;max-width:100%;}
body{font-family:var(--font-sans);font-size:var(--font-size-md);color:var(--color-text-primary);background:var(--color-surface-background);line-height:1.6;}
img{max-width:100%;height:auto;display:block;}
a{color:inherit;text-decoration:none;}

/* Scroll lock when mobile menu is open */
body.menu-open{overflow:hidden;}

/* ─── Top bar ─── */
.topbar{
  position:sticky;top:0;z-index:100;
  height:56px;
  background:var(--color-surface-background);
  border-bottom:1px solid var(--color-border-default);
  display:flex;align-items:center;
  padding:0 var(--space-6);
}
.topbar-inner{
  display:flex;align-items:center;justify-content:space-between;
  width:100%;max-width:1200px;margin:0 auto;
  gap:var(--space-4);
}
.logo-link{display:flex;align-items:center;gap:var(--space-2);text-decoration:none;flex-shrink:0;}
.logo-svg{width:28px;height:28px;flex-shrink:0;}
.logo-text{font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold);color:var(--color-text-primary);}

/* Desktop nav links */
.nav{display:flex;align-items:center;flex:1;}
.nav-links{
  display:flex;align-items:center;gap:var(--space-4);
  list-style:none;flex:1;
}
.nav-links a{
  font-size:var(--font-size-base);color:var(--color-text-secondary);
  font-weight:var(--font-weight-medium);transition:color 0.15s;white-space:nowrap;
}
.nav-links a:hover{color:var(--color-text-primary);}

/* Language switcher - pushed to the right on desktop */
.lang-switcher{
  display:flex;align-items:center;gap:4px;
  font-size:var(--font-size-sm);
  margin-left:auto; /* pushes lang-switcher right */
}
.lang-switcher a{color:var(--color-text-secondary);padding:2px 6px;border-radius:var(--radius-sm);}
.lang-switcher a:hover{color:var(--color-text-primary);background:var(--color-surface-muted);}
.lang-switcher a.active{color:var(--color-text-primary);font-weight:var(--font-weight-medium);}
.lang-sep{color:var(--color-text-tertiary);}

/* Desktop: hide CTA inside nav-links (it lives there for mobile menu), hide Log in button */
@media(min-width:769px){
  .nav-links li:has(.nav-actions){display:none;}
  .topbar-inner .btn-secondary{display:none;}
}

/* Single desktop CTA */
.nav-actions-outer{display:flex;align-items:center;flex-shrink:0;}

/* ─── Buttons ─── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  border:none;cursor:pointer;font-family:var(--font-sans);
  font-size:var(--font-size-base);font-weight:var(--font-weight-medium);
  border-radius:var(--radius-pill);padding:8px 16px;transition:all 0.15s;
  text-decoration:none;gap:var(--space-2);white-space:nowrap;
}
.btn-primary{background:var(--color-action-primary-bg);color:var(--color-action-primary-fg);}
.btn-primary:hover{background:var(--color-action-primary-bg-hover);}
.btn-secondary{background:transparent;color:var(--color-text-primary);border:1px solid var(--color-border-heavy);}
.btn-secondary:hover{background:var(--color-surface-muted);}
.btn-lg{padding:12px 24px;font-size:var(--font-size-md);}
.btn-xl{padding:14px 28px;font-size:var(--font-size-md);font-weight:var(--font-weight-semibold);}

/* ─── Mobile hamburger ─── */
.nav-toggle{
  display:none;background:none;border:0;
  font-size:24px;cursor:pointer;color:var(--color-text-primary);
  padding:var(--space-2);line-height:1;flex-shrink:0;
}

/* ─── Hero ─── */
.hero{
  min-height:calc(100vh - 56px);
  display:flex;flex-direction:column;
  align-items:center;justify-content:center;
  padding:var(--space-12) var(--space-6);
  text-align:center;
}
.hero-eyebrow{font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:var(--color-text-secondary);letter-spacing:0.05em;text-transform:uppercase;margin-bottom:var(--space-4);}
.hero-title{font-size:clamp(2rem,5vw,3.5rem);font-weight:var(--font-weight-semibold);line-height:1.15;max-width:700px;margin-bottom:var(--space-6);}
.hero-subtitle{font-size:var(--font-size-md);color:var(--color-text-secondary);max-width:560px;margin-bottom:var(--space-8);}
.hero-cta{display:flex;gap:var(--space-3);flex-wrap:wrap;justify-content:center;}

.composer-box{
  background:var(--color-surface-background);
  border:1px solid var(--color-border-medium);
  border-radius:var(--radius-4xl);
  padding:16px 20px;
  display:flex;align-items:center;gap:var(--space-3);
  max-width:680px;width:100%;
  margin-top:var(--space-8);
  box-shadow:0 4px 80px 8px rgba(0,0,0,.04),0 0 1px 0 rgba(0,0,0,.12);
  cursor:text;
}
.composer-box span{flex:1;color:var(--color-text-placeholder);font-size:var(--font-size-md);text-align:left;}
.composer-send{width:32px;height:32px;border-radius:50%;background:var(--color-action-primary-bg);color:var(--color-action-primary-fg);display:flex;align-items:center;justify-content:center;font-size:14px;cursor:pointer;flex-shrink:0;}

.suggestions{display:flex;gap:var(--space-2);flex-wrap:wrap;justify-content:center;margin-top:var(--space-4);max-width:680px;}
.suggestion-chip{background:var(--color-surface-elevated);border:1px solid var(--color-border-default);border-radius:var(--radius-pill);padding:6px 14px;font-size:var(--font-size-sm);color:var(--color-text-secondary);cursor:pointer;transition:background 0.15s;white-space:nowrap;}
.suggestion-chip:hover{background:var(--color-surface-muted);}

/* ─── Section scaffold ─── */
.section{padding:80px var(--space-6);}
.section-inner{max-width:1100px;margin:0 auto;}
.section-label{font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);text-transform:uppercase;letter-spacing:0.1em;color:var(--color-text-tertiary);margin-bottom:var(--space-3);}
.section-title{font-size:clamp(1.6rem,3.5vw,2.4rem);font-weight:var(--font-weight-semibold);line-height:1.2;margin-bottom:var(--space-4);}
.section-subtitle{font-size:var(--font-size-md);color:var(--color-text-secondary);max-width:560px;margin-bottom:var(--space-10);}
.section-bg{background:var(--color-surface-elevated);}

/* ─── Feature grid ─── */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-6);}
.feature-card{background:var(--color-surface-background);border:1px solid var(--color-border-default);border-radius:var(--radius-2xl);padding:var(--space-6);transition:box-shadow 0.15s;}
.feature-card:hover{box-shadow:0 4px 16px rgba(0,0,0,.06);}
.feature-icon{width:44px;height:44px;border-radius:var(--radius-lg);background:var(--color-surface-muted);display:flex;align-items:center;justify-content:center;font-size:20px;margin-bottom:var(--space-4);}
.feature-title{font-size:var(--font-size-md);font-weight:var(--font-weight-semibold);margin-bottom:var(--space-2);}
.feature-desc{font-size:var(--font-size-sm);color:var(--color-text-secondary);line-height:1.6;}

/* ─── Stats row ─── */
.stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--space-8);text-align:center;}
.stat-num{font-size:clamp(2rem,4vw,3rem);font-weight:var(--font-weight-semibold);line-height:1;margin-bottom:var(--space-2);}
.stat-label{font-size:var(--font-size-sm);color:var(--color-text-secondary);}

/* ─── Use-case cards ─── */
.usecase-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-6);}
.usecase-card{border:1px solid var(--color-border-default);border-radius:var(--radius-2xl);overflow:hidden;}
.usecase-img{width:100%;height:200px;object-fit:cover;}
.usecase-body{padding:var(--space-6);}
.usecase-tag{display:inline-block;font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);text-transform:uppercase;letter-spacing:0.08em;color:var(--color-action-accent);margin-bottom:var(--space-3);}
.usecase-title{font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold);margin-bottom:var(--space-2);}
.usecase-desc{font-size:var(--font-size-sm);color:var(--color-text-secondary);}

/* ─── Split row ─── */
.split-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-12);align-items:center;}
.split-row.reverse{direction:rtl;}
.split-row.reverse>*{direction:ltr;}
.split-img{border-radius:var(--radius-2xl);width:100%;aspect-ratio:4/3;object-fit:cover;}
.split-body .section-title{margin-bottom:var(--space-3);}
.split-body .section-subtitle{margin-bottom:var(--space-6);}

/* ─── China keyword block ─── */
.keyword-cloud{display:flex;flex-wrap:wrap;gap:var(--space-2);margin:var(--space-6) 0;}
.keyword-pill{background:var(--color-surface-muted);border-radius:var(--radius-pill);padding:4px 12px;font-size:var(--font-size-sm);color:var(--color-text-secondary);}

/* ─── Restrictions list ─── */
.restrictions-list{list-style:none;display:flex;flex-direction:column;gap:var(--space-3);}
.restrictions-list li{display:flex;align-items:flex-start;gap:var(--space-3);background:var(--color-surface-elevated);border-radius:var(--radius-xl);padding:var(--space-4) var(--space-5);}
.restrictions-list li .icon{font-size:18px;flex-shrink:0;margin-top:2px;}
.restrictions-list li strong{display:block;font-weight:var(--font-weight-medium);margin-bottom:2px;}
.restrictions-list li span{font-size:var(--font-size-sm);color:var(--color-text-secondary);}

/* ─── FAQ ─── */
.faq-list{display:flex;flex-direction:column;gap:var(--space-2);}
.faq-item{border:1px solid var(--color-border-default);border-radius:var(--radius-xl);overflow:hidden;}
.faq-q{width:100%;background:none;border:0;padding:var(--space-5) var(--space-6);display:flex;justify-content:space-between;align-items:center;font-family:var(--font-sans);font-size:var(--font-size-md);font-weight:var(--font-weight-medium);cursor:pointer;text-align:left;color:var(--color-text-primary);}
.faq-q:hover{background:var(--color-surface-elevated);}
.faq-q .chevron{transition:transform 0.2s;font-size:12px;color:var(--color-text-tertiary);}
.faq-item.open .faq-q .chevron{transform:rotate(180deg);}
.faq-a{display:none;padding:0 var(--space-6) var(--space-5);font-size:var(--font-size-base);color:var(--color-text-secondary);}
.faq-item.open .faq-a{display:block;}

/* ─── CTA banner ─── */
.cta-banner{background:var(--color-text-primary);color:var(--color-action-primary-fg);border-radius:var(--radius-3xl);padding:60px var(--space-10);text-align:center;}
.cta-banner .section-title{color:#fff;}
.cta-banner .section-subtitle{color:rgba(255,255,255,.7);}
.cta-banner .btn-primary{background:#fff;color:#000;}
.cta-banner .btn-primary:hover{background:#f0f0f0;}

/* ─── Footer ─── */
.footer{background:var(--color-surface-elevated);border-top:1px solid var(--color-border-default);padding:48px var(--space-6) var(--space-8);}
.footer-inner{max-width:1100px;margin:0 auto;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:var(--space-10);margin-bottom:var(--space-10);}
.footer-brand .logo-link{margin-bottom:var(--space-4);}
.footer-tagline{font-size:var(--font-size-sm);color:var(--color-text-secondary);max-width:260px;}
.footer-col h4{font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);margin-bottom:var(--space-4);}
.footer-col ul{list-style:none;display:flex;flex-direction:column;gap:var(--space-3);}
.footer-col ul a{font-size:var(--font-size-sm);color:var(--color-text-secondary);}
.footer-col ul a:hover{color:var(--color-text-primary);}
.footer-bottom{border-top:1px solid var(--color-border-default);padding-top:var(--space-6);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:var(--space-4);}
.footer-copy{font-size:var(--font-size-xs);color:var(--color-text-tertiary);}
.footer-links{display:flex;gap:var(--space-4);}
.footer-links a{font-size:var(--font-size-xs);color:var(--color-text-tertiary);}
.footer-links a:hover{color:var(--color-text-secondary);}

/* ─── Page header ─── */
.page-hero{padding:80px var(--space-6) 60px;text-align:center;background:var(--color-surface-elevated);border-bottom:1px solid var(--color-border-default);}
.page-hero-title{font-size:clamp(1.8rem,4vw,3rem);font-weight:var(--font-weight-semibold);margin-bottom:var(--space-4);}
.page-hero-subtitle{font-size:var(--font-size-md);color:var(--color-text-secondary);max-width:600px;margin:0 auto;}

/* ─── Prose ─── */
.prose{max-width:760px;margin:0 auto;}
.prose h2{font-size:1.4rem;font-weight:var(--font-weight-semibold);margin:2rem 0 .8rem;}
.prose h3{font-size:1.1rem;font-weight:var(--font-weight-semibold);margin:1.5rem 0 .5rem;}
.prose p{font-size:var(--font-size-base);color:var(--color-text-secondary);margin-bottom:1rem;line-height:1.7;}
.prose ul{padding-left:1.5rem;margin-bottom:1rem;}
.prose ul li{font-size:var(--font-size-base);color:var(--color-text-secondary);margin-bottom:.4rem;line-height:1.6;}

/* ─── Breadcrumb ─── */
.breadcrumb{font-size:var(--font-size-sm);color:var(--color-text-tertiary);margin-bottom:var(--space-6);}
.breadcrumb a{color:var(--color-text-tertiary);}
.breadcrumb a:hover{color:var(--color-text-secondary);}
.breadcrumb span{margin:0 6px;}

/* ─── Image strip ─── */
.img-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-4);margin:var(--space-10) 0;}
.img-strip img{border-radius:var(--radius-2xl);aspect-ratio:4/3;width:100%;object-fit:cover;}

/* ─── Responsive ─── */
@media(max-width:768px){
  /* Make <nav> layout-transparent so its children join topbar-inner flex */
  nav{display:contents;}

  /* Reorder mobile topbar: logo | CTA | hamburger */
  .logo-link{order:1;}
  .nav-actions{order:2;display:flex !important;}
  .nav-toggle{order:3;display:block;}

  /* Hide desktop-only items inside nav-links */
  .nav-links{
    display:none;
    position:fixed;
    top:56px;left:0;right:0;
    /* No bottom:0 — height is auto (content-sized) */
    flex-direction:column;align-items:center;
    background:var(--color-surface-background);
    padding:var(--space-4) 0 var(--space-8);
    overflow-y:auto;z-index:999;
    gap:0;
    border-top:1px solid var(--color-border-default);
    box-shadow:0 8px 32px rgba(0,0,0,.08);
  }
  .nav-links.open{display:flex;}
  .nav-links li{width:100%;text-align:center;}
  .nav-links a{display:block;padding:14px var(--space-6);font-size:var(--font-size-lg);}

  /* Language switcher — centered in mobile menu */
  .nav-links li:has(.lang-switcher){
    border-top:1px solid var(--color-border-default);
    border-bottom:1px solid var(--color-border-default);
    margin:var(--space-3) 0;
  }
  .nav-links .lang-switcher{
    justify-content:center;
    width:100%;
    padding:14px var(--space-6);
    gap:24px;
    font-size:var(--font-size-md);
  }
  .nav-links .lang-switcher a{font-size:var(--font-size-md);padding:4px 12px;}
  .lang-sep{display:block !important;}

  /* CTA inside mobile menu */
  .nav-links li:has(.nav-actions){padding:var(--space-3) var(--space-6) var(--space-4);}
  .nav-links li:has(.nav-actions) .btn{width:100%;justify-content:center;padding:14px;}

  .hero{padding:60px var(--space-4);min-height:auto;}
  .hero-cta{flex-direction:column;align-items:center;}
  .composer-box{margin-top:var(--space-6);}
  .suggestions{display:none;}

  .features-grid{grid-template-columns:1fr;}
  .stats-row{grid-template-columns:repeat(2,1fr);gap:var(--space-6);}
  .usecase-grid{grid-template-columns:1fr;}
  .split-row{grid-template-columns:1fr;}
  .split-row.reverse{direction:ltr;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:var(--space-6);}
  .img-strip{grid-template-columns:1fr;}
  .section{padding:60px var(--space-4);}
  .cta-banner{padding:40px var(--space-5);}
}

@media(max-width:480px){
  .stats-row{grid-template-columns:1fr 1fr;}
  .footer-grid{grid-template-columns:1fr;}
}