/* ============================================================
   AppAI Landing v4 — Premium SaaS Polish
   Balanced palette · Refined typography · Elegant motion
   Premium glassmorphism · Consistent design tokens
   ============================================================ */

/* --appai-vn-- Reset --appai-vn-- */
body.appai-vn-page #main *,body.appai-vn-page #main *::before,body.appai-vn-page #main *::after{margin:0;padding:0;box-sizing:border-box}

/* --appai-vn-- Design Tokens — Unified System --appai-vn-- */
body.appai-vn-page #main{
  /* ── Backgrounds ── */
  --appai-vn-bg:#ffffff;
  --appai-vn-bg-elevated:#f8fafc;
  --appai-vn-bg-muted:#f1f5f9;
  --appai-vn-bg-card:#ffffff;
  --appai-vn-bg-hero:linear-gradient(176deg,#eef4ff 0%,#f6f9ff 40%,#ffffff 100%);

  /* ── Surfaces & Borders ── */
  --appai-vn-surface-50:rgba(0,0,0,.012);
  --appai-vn-surface-100:rgba(0,0,0,.025);
  --appai-vn-surface-200:rgba(0,0,0,.045);
  --appai-vn-border:rgba(15,23,42,.08);
  --appai-vn-border-subtle:rgba(15,23,42,.05);
  --appai-vn-border-hover:rgba(15,23,42,.13);
  --appai-vn-border-focus:rgba(0,92,224,.4);

  /* ── Text — 4-level hierarchy (high contrast) ── */
  --appai-vn-text-primary:#0a0f1e;
  --appai-vn-text-secondary:#374151;
  --appai-vn-text-tertiary:#6b7280;
  --appai-vn-text-quaternary:#9ca3af;

  /* ── Brand Blue — Refined ── */
  --appai-vn-blue-600:#005CE0;
  --appai-vn-blue-700:#0048B3;
  --appai-vn-blue-500:#1672EA;
  --appai-vn-blue-400:#579AF0;
  --appai-vn-blue-300:#91BEF7;
  --appai-vn-blue-50:#F0F6FF;
  --appai-vn-blue-100:#DCEAFF;
  --appai-vn-blue-glow:rgba(0,92,224,.12);
  --appai-vn-blue-glow-lg:rgba(0,92,224,.2);

  /* ── Accent Palette (harmonized with blue) ── */
  --appai-vn-cyan-600:#0891b2;
  --appai-vn-cyan-500:#06b6d4;
  --appai-vn-cyan-50:#ecfeff;
  --appai-vn-cyan-glow:rgba(8,145,178,.1);

  --appai-vn-violet-600:#7c3aed;
  --appai-vn-violet-500:#8b5cf6;
  --appai-vn-violet-50:#f5f3ff;
  --appai-vn-violet-100:#ede9fe;
  --appai-vn-violet-glow:rgba(124,58,237,.08);

  --appai-vn-emerald-600:#059669;
  --appai-vn-emerald-500:#10b981;
  --appai-vn-emerald-50:#ecfdf5;
  --appai-vn-emerald-100:#d1fae5;
  --appai-vn-emerald-glow:rgba(5,150,105,.08);

  --appai-vn-rose-600:#e11d48;
  --appai-vn-rose-50:#fff1f2;
  --appai-vn-rose-100:#ffe4e6;
  --appai-vn-rose-400:#fb7185;

  --appai-vn-amber-500:#f59e0b;
  --appai-vn-amber-400:#fbbf24;
  --appai-vn-amber-50:#fffbeb;

  /* ── Shadows — Refined depth scale ── */
  --appai-vn-shadow-xs:0 1px 2px rgba(15,23,42,.04);
  --appai-vn-shadow-sm:0 1px 3px rgba(15,23,42,.06),0 1px 2px rgba(15,23,42,.02);
  --appai-vn-shadow-md:0 4px 16px rgba(15,23,42,.06),0 1px 4px rgba(15,23,42,.03);
  --appai-vn-shadow-lg:0 10px 28px rgba(15,23,42,.07),0 2px 8px rgba(15,23,42,.03);
  --appai-vn-shadow-xl:0 20px 44px rgba(15,23,42,.08),0 4px 16px rgba(15,23,42,.03);
  --appai-vn-shadow-2xl:0 28px 64px rgba(15,23,42,.12);
  --appai-vn-shadow-blue:0 0 0 1px rgba(0,92,224,.04),0 4px 24px rgba(0,92,224,.06);
  --appai-vn-shadow-blue-lg:0 0 0 1px rgba(0,92,224,.06),0 8px 40px rgba(0,92,224,.1);
  --appai-vn-shadow-card-hover:0 12px 32px rgba(15,23,42,.08),0 2px 8px rgba(0,92,224,.04);

  /* ── Radii — 5-step scale ── */
  --appai-vn-r-xs:6px;
  --appai-vn-r-sm:8px;
  --appai-vn-r-md:12px;
  --appai-vn-r-lg:16px;
  --appai-vn-r-xl:20px;
  --appai-vn-r-2xl:24px;
  --appai-vn-r-full:9999px;

  /* ── Spacing — 4px base grid ── */
  --appai-vn-sp-1:4px; --appai-vn-sp-2:8px; --appai-vn-sp-3:12px; --appai-vn-sp-4:16px;
  --appai-vn-sp-5:20px; --appai-vn-sp-6:24px; --appai-vn-sp-8:32px; --appai-vn-sp-10:40px;
  --appai-vn-sp-12:48px; --appai-vn-sp-16:64px; --appai-vn-sp-20:80px; --appai-vn-sp-24:96px;

  /* ── Typography ── */
  --appai-vn-font:'Inter',system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --appai-vn-container:1180px;

  /* ── Transition ── */
  --appai-vn-ease:cubic-bezier(.4,0,.2,1);
  --appai-vn-ease-out:cubic-bezier(.2,.8,.3,1);
  --appai-vn-ease-spring:cubic-bezier(.34,1.56,.64,1);
  --appai-vn-duration-fast:.15s;
  --appai-vn-duration:.25s;
  --appai-vn-duration-slow:.4s;
}

/* --appai-vn-- Base --appai-vn-- */
body.appai-vn-page #main{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}
body.appai-vn-page #main{font-family:var(--appai-vn-font);font-size:1.125rem;font-weight:400;line-height:1.7;
  color:var(--appai-vn-text-secondary);background:var(--appai-vn-bg);overflow-x:hidden}
body.appai-vn-page #main h1,body.appai-vn-page #main h2,body.appai-vn-page #main h3,body.appai-vn-page #main h4{color:var(--appai-vn-text-primary);font-weight:700;line-height:1.22;letter-spacing:-.02em}
body.appai-vn-page #main a{color:var(--appai-vn-blue-600);text-decoration:none;transition:color var(--appai-vn-duration) var(--appai-vn-ease)}
body.appai-vn-page #main a:hover{color:var(--appai-vn-blue-700)}
body.appai-vn-page #main img{max-width:100%;height:auto;display:block}
body.appai-vn-page #main ul{list-style:none}
body.appai-vn-page #main .container{max-width:var(--appai-vn-container);margin:0 auto;padding:0 var(--appai-vn-sp-6)}
body.appai-vn-page #main .section{display:block;padding:var(--appai-vn-sp-20) 0;position:relative}
body.appai-vn-page #main .section-alt{background:var(--appai-vn-bg-elevated)}

/* --appai-vn-- Accent text (solid blue — clean & trustworthy) --appai-vn-- */
body.appai-vn-page #main .gradient-text{color:var(--appai-vn-blue-600)}

/* --appai-vn-- Section headers --appai-vn-- */
body.appai-vn-page #main .section-header{text-align:center;margin-bottom:var(--appai-vn-sp-12);max-width:680px;margin-left:auto;margin-right:auto}
body.appai-vn-page #main .section-chip{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;
  border-radius:var(--appai-vn-r-full);font-size:.8125rem;font-weight:600;letter-spacing:.06em;
  text-transform:uppercase;color:var(--appai-vn-blue-600);
  background:var(--appai-vn-blue-50);border:1px solid var(--appai-vn-blue-100);margin-bottom:var(--appai-vn-sp-4)}
body.appai-vn-page #main .section-chip i{font-size:.9rem}
body.appai-vn-page #main .section-header h2{font-size:2rem;margin-bottom:var(--appai-vn-sp-4);letter-spacing:-.025em;font-weight:800}
body.appai-vn-page #main .section-header p{font-size:1.125rem;color:var(--appai-vn-text-secondary);line-height:1.75}

/* --appai-vn-- Scroll reveal — enhanced with scale for depth --appai-vn-- */
body.appai-vn-page #main .rv{opacity:0;transform:translateY(24px) scale(.97);transition:opacity .7s var(--appai-vn-ease-out),transform .7s var(--appai-vn-ease-out)}
body.appai-vn-page #main .rv.shown{opacity:1;transform:translateY(0) scale(1)}
body.appai-vn-page #main .rv-d1{transition-delay:.1s}body.appai-vn-page #main .rv-d2{transition-delay:.2s}
body.appai-vn-page #main .rv-d3{transition-delay:.3s}body.appai-vn-page #main .rv-d4{transition-delay:.4s}

/* --appai-vn-- Buttons — refined with inner glow --appai-vn-- */
body.appai-vn-page #main .btn{display:inline-flex;align-items:center;gap:var(--appai-vn-sp-2);padding:11px 22px;
  font-family:var(--appai-vn-font);font-size:.875rem;font-weight:600;
  border-radius:var(--appai-vn-r-full);border:none;cursor:pointer;text-decoration:none;
  transition:all var(--appai-vn-duration) var(--appai-vn-ease);white-space:nowrap;position:relative;overflow:hidden}
body.appai-vn-page #main .btn i{font-size:1em;transition:transform var(--appai-vn-duration) var(--appai-vn-ease)}
body.appai-vn-page #main .btn:hover i{transform:translateX(3px)}

body.appai-vn-page #main .btn-primary{
  background:var(--appai-vn-blue-600);color:#fff;
  box-shadow:0 1px 3px rgba(0,0,0,.12),0 4px 14px var(--appai-vn-blue-glow)}
body.appai-vn-page #main .btn-primary:hover{transform:translateY(-2px);background:#0048B3;
  box-shadow:0 4px 8px rgba(0,0,0,.14),0 8px 24px var(--appai-vn-blue-glow-lg);color:#fff}
body.appai-vn-page #main .btn-primary:active{transform:translateY(0)}

body.appai-vn-page #main .btn-outline{
  background:var(--appai-vn-bg);color:var(--appai-vn-text-primary);
  border:1.5px solid var(--appai-vn-border);box-shadow:var(--appai-vn-shadow-sm)}
body.appai-vn-page #main .btn-outline:hover{border-color:var(--appai-vn-blue-600);color:var(--appai-vn-blue-700);
  background:#fff;transform:translateY(-2px);box-shadow:0 4px 16px rgba(0,92,224,.12)}
body.appai-vn-page #main .btn-outline:hover i{color:var(--appai-vn-blue-700)}

body.appai-vn-page #main .btn-lg{padding:13px 28px;font-size:.9375rem}
body.appai-vn-page #main .btn-xl{padding:15px 34px;font-size:.9375rem}

/* ============================================================
   HEADER — Glassmorphism Floating (Stripe / Linear style)
   Floating pill with glass backdrop, gradient accent border
   ============================================================ */
body.appai-vn-page #main .site-header{position:fixed;top:12px;left:0;right:0;z-index:1000;
  padding:0 var(--appai-vn-sp-6);
  transition:top .45s var(--appai-vn-ease),padding .45s var(--appai-vn-ease)}

body.appai-vn-page #main .header-inner{display:flex;align-items:center;
  max-width:var(--appai-vn-container);margin:0 auto;padding:0 8px 0 var(--appai-vn-sp-6);height:64px;
  border-radius:var(--appai-vn-r-full);
  background:rgba(255,255,255,.72);
  backdrop-filter:blur(20px) saturate(1.6);-webkit-backdrop-filter:blur(20px) saturate(1.6);
  border:1px solid rgba(255,255,255,.6);
  box-shadow:
    0 0 0 1px rgba(15,23,42,.04),
    0 2px 6px rgba(15,23,42,.04),
    0 8px 24px rgba(15,23,42,.06),
    inset 0 1px 0 rgba(255,255,255,.5);
  position:relative;overflow:hidden;
  transition:height .35s var(--appai-vn-ease),border-radius .35s var(--appai-vn-ease),
    background .35s var(--appai-vn-ease),box-shadow .35s var(--appai-vn-ease),border-color .35s var(--appai-vn-ease)}

/* Animated gradient accent line at bottom of floating header */
body.appai-vn-page #main .header-inner::after{content:'';position:absolute;bottom:0;left:20%;right:20%;height:1px;
  background:linear-gradient(90deg,transparent,var(--appai-vn-blue-500),var(--appai-vn-violet-500),transparent);
  opacity:.45;transition:opacity .35s var(--appai-vn-ease)}

/* Scrolled state — slightly more opaque, tighter */
body.appai-vn-page #main .site-header.scrolled{top:8px}
body.appai-vn-page #main .site-header.scrolled .header-inner{height:56px;
  background:rgba(255,255,255,.92);
  border-color:rgba(15,23,42,.06);
  box-shadow:
    0 0 0 1px rgba(15,23,42,.05),
    0 4px 12px rgba(15,23,42,.06),
    0 12px 40px rgba(15,23,42,.08)}
body.appai-vn-page #main .site-header.scrolled .header-inner::after{opacity:.7}

/* Logo */
body.appai-vn-page #main .header-logo{display:flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0;margin-right:var(--appai-vn-sp-8)}
body.appai-vn-page #main .logo-mark{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--appai-vn-blue-600),var(--appai-vn-blue-700));font-size:1.1rem;color:#fff;flex-shrink:0;
  box-shadow:0 2px 8px rgba(0,92,224,.3),inset 0 1px 0 rgba(255,255,255,.15);
  transition:transform .3s var(--appai-vn-ease-spring),box-shadow .3s var(--appai-vn-ease)}
body.appai-vn-page #main .logo-mark:hover{transform:scale(1.08) rotate(-2deg);box-shadow:0 4px 16px rgba(0,92,224,.35),inset 0 1px 0 rgba(255,255,255,.15)}
body.appai-vn-page #main .logo-mark.sm{width:26px;height:26px;border-radius:7px;font-size:.9rem;box-shadow:0 1px 4px rgba(0,92,224,.15)}
body.appai-vn-page #main .logo-text{font-weight:800;font-size:1.25rem;color:var(--appai-vn-text-primary);letter-spacing:-.02em}

/* Navigation — pill highlight on hover */
body.appai-vn-page #main .header-nav{display:flex;align-items:center;gap:2px;flex:1}
body.appai-vn-page #main .header-nav a{position:relative;font-size:.9rem;font-weight:500;padding:7px 14px;
  color:var(--appai-vn-text-secondary);transition:color .25s var(--appai-vn-ease),background .25s var(--appai-vn-ease);
  border-radius:var(--appai-vn-r-full)}
body.appai-vn-page #main .header-nav a:hover{color:var(--appai-vn-blue-600);background:rgba(0,92,224,.06)}
body.appai-vn-page #main .header-nav a.active{color:var(--appai-vn-blue-600);background:rgba(0,92,224,.08);font-weight:600}

/* Right side actions */
body.appai-vn-page #main .header-actions{display:flex;align-items:center;gap:var(--appai-vn-sp-3);margin-left:auto}

/* Header social icons */
body.appai-vn-page #main .header-social{display:flex;align-items:center;gap:2px}
body.appai-vn-page #main .header-social a{width:30px;height:30px;border-radius:var(--appai-vn-r-sm);display:flex;
  align-items:center;justify-content:center;color:var(--appai-vn-text-tertiary);font-size:.95rem;
  transition:all .25s var(--appai-vn-ease)}
body.appai-vn-page #main .header-social a:hover{color:var(--appai-vn-blue-600);background:rgba(0,92,224,.06)}

/* Language switcher */
body.appai-vn-page #main .lang-switch{position:relative}
body.appai-vn-page #main .lang-btn{display:flex;align-items:center;gap:4px;padding:6px 12px;
  font-family:var(--appai-vn-font);font-size:.8125rem;font-weight:600;
  color:var(--appai-vn-text-secondary);background:none;border:1px solid var(--appai-vn-border);
  border-radius:var(--appai-vn-r-full);cursor:pointer;
  transition:all .25s var(--appai-vn-ease)}
body.appai-vn-page #main .lang-btn:hover{color:var(--appai-vn-blue-600);border-color:var(--appai-vn-blue-100);background:rgba(0,92,224,.04)}
body.appai-vn-page #main .lang-btn i{font-size:.85rem}
body.appai-vn-page #main .lang-arrow{font-size:.7rem!important;transition:transform .25s var(--appai-vn-ease)}
body.appai-vn-page #main .lang-switch.open .lang-arrow{transform:rotate(180deg)}
body.appai-vn-page #main .lang-dropdown{position:absolute;top:calc(100% + 8px);right:0;min-width:150px;
  background:var(--appai-vn-bg);border:1px solid var(--appai-vn-border);border-radius:var(--appai-vn-r-md);
  box-shadow:var(--appai-vn-shadow-lg);opacity:0;visibility:hidden;transform:translateY(-6px);
  transition:all .25s var(--appai-vn-ease);z-index:10;overflow:hidden}
body.appai-vn-page #main .lang-switch.open .lang-dropdown{opacity:1;visibility:visible;transform:translateY(0)}
body.appai-vn-page #main .lang-option{display:flex;align-items:center;gap:8px;padding:10px 16px;
  font-size:.875rem;font-weight:500;color:var(--appai-vn-text-secondary);
  transition:all .2s var(--appai-vn-ease);text-decoration:none}
body.appai-vn-page #main .lang-option:hover{background:var(--appai-vn-blue-50);color:var(--appai-vn-blue-600)}
body.appai-vn-page #main .lang-option.active{color:var(--appai-vn-blue-600);font-weight:600;background:rgba(0,92,224,.04)}

body.appai-vn-page #main .btn-header{padding:9px 22px;font-size:.8125rem;font-weight:600;border-radius:var(--appai-vn-r-full);
  box-shadow:0 2px 8px rgba(0,92,224,.2),0 0 0 1px rgba(0,92,224,.08);
  transition:transform .25s var(--appai-vn-ease),box-shadow .25s var(--appai-vn-ease),background .25s var(--appai-vn-ease)}
body.appai-vn-page #main .btn-header:hover{transform:translateY(-1px);
  box-shadow:0 4px 16px rgba(0,92,224,.3),0 0 0 1px rgba(0,92,224,.12)}

body.appai-vn-page #main .mob-toggle{display:none;background:none;border:none;color:var(--appai-vn-text-primary);
  font-size:1.3rem;cursor:pointer;padding:var(--appai-vn-sp-2);border-radius:var(--appai-vn-r-sm);
  transition:color .25s var(--appai-vn-ease)}
body.appai-vn-page #main .mob-toggle:hover{color:var(--appai-vn-blue-600)}

/* ============================================================
   HERO — Premium depth with balanced gradients
   ============================================================ */
body.appai-vn-page #main .hero{padding:calc(var(--appai-vn-sp-20) + 48px) 0 var(--appai-vn-sp-20);
  background:var(--appai-vn-bg-hero);
  position:relative;overflow:hidden}

/* Dot mesh background — subtler, more refined */
body.appai-vn-page #main .hero-mesh{position:absolute;inset:0;
  background-image:radial-gradient(circle,rgba(0,92,224,.06) 1px,transparent 1px);
  background-size:32px 32px;
  mask-image:radial-gradient(ellipse 70% 60% at 50% 40%,black 10%,transparent 70%);
  -webkit-mask-image:radial-gradient(ellipse 70% 60% at 50% 40%,black 10%,transparent 70%);
  animation:appai-vn-mesh-fade 12s ease-in-out infinite alternate}
@keyframes appai-vn-mesh-fade{0%{opacity:.3}100%{opacity:.55}}

body.appai-vn-page #main .hero-gradient{position:absolute;border-radius:50%;filter:blur(120px);pointer-events:none}
body.appai-vn-page #main .hero-gradient-1{width:520px;height:520px;top:-180px;left:-120px;
  background:radial-gradient(circle,rgba(0,92,224,.08),transparent 70%);
  animation:appai-vn-float-slow 16s ease-in-out infinite}
body.appai-vn-page #main .hero-gradient-2{width:400px;height:400px;bottom:-120px;right:-80px;
  background:radial-gradient(circle,rgba(124,58,237,.05),transparent 70%);
  animation:appai-vn-float-slow 20s ease-in-out infinite reverse}
@keyframes appai-vn-float-slow{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(20px,-12px) scale(1.05)}}

body.appai-vn-page #main .hero-orbs{position:absolute;inset:0;pointer-events:none;overflow:hidden}
body.appai-vn-page #main .orb{position:absolute;width:3px;height:3px;border-radius:50%;background:var(--appai-vn-blue-300);
  opacity:0;animation:appai-vn-orb-rise 7s ease-in-out infinite}
body.appai-vn-page #main .orb-1{left:12%;animation-delay:0s;animation-duration:9s}
body.appai-vn-page #main .orb-2{left:32%;animation-delay:2s;animation-duration:7s}
body.appai-vn-page #main .orb-3{left:58%;animation-delay:3.5s;animation-duration:10s}
body.appai-vn-page #main .orb-4{left:74%;animation-delay:.8s;animation-duration:8s}
body.appai-vn-page #main .orb-5{left:88%;animation-delay:2.8s;animation-duration:7.5s}
@keyframes appai-vn-orb-rise{
  0%{transform:translateY(100vh) scale(0);opacity:0}
  15%{opacity:.25}
  85%{opacity:.1}
  100%{transform:translateY(-40px) scale(1.2);opacity:0}}

body.appai-vn-page #main .hero-inner{display:grid;grid-template-columns:1fr 1fr;gap:var(--appai-vn-sp-8);align-items:center;position:relative;z-index:1}
body.appai-vn-page #main .hero-copy{max-width:560px}

body.appai-vn-page #main .hero-badge{display:inline-flex;align-items:center;gap:var(--appai-vn-sp-2);padding:6px 18px;
  border-radius:var(--appai-vn-r-full);font-size:.8125rem;font-weight:600;
  background:rgba(0,92,224,.06);border:1px solid rgba(0,92,224,.1);
  color:var(--appai-vn-blue-600);margin-bottom:var(--appai-vn-sp-4);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
body.appai-vn-page #main .badge-appai-vn-pulse{width:7px;height:7px;border-radius:50%;background:var(--appai-vn-emerald-500);
  box-shadow:0 0 6px var(--appai-vn-emerald-500);animation:appai-vn-pulse 2.5s ease-in-out infinite}
@keyframes appai-vn-pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.75)}}

body.appai-vn-page #main .hero h1{font-size:clamp(1.75rem,3.5vw,2.5rem);line-height:1.25;letter-spacing:-.02em;margin-bottom:var(--appai-vn-sp-3);
  font-weight:800}
body.appai-vn-page #main .hero h1 .hl{color:var(--appai-vn-blue-600)}
body.appai-vn-page #main .hero-sub{font-size:1rem;color:var(--appai-vn-text-secondary);line-height:1.8;margin-bottom:var(--appai-vn-sp-4);max-width:500px}

/* Hero CTA buttons — always inline */
body.appai-vn-page #main .hero-cta{display:flex;gap:var(--appai-vn-sp-3);margin-bottom:var(--appai-vn-sp-4)}

/* Hero assurance checks */
body.appai-vn-page #main .hero-assurance{display:flex;flex-wrap:nowrap;gap:18px}
body.appai-vn-page #main .hero-assurance span{display:inline-flex;align-items:center;gap:6px;
  font-size:.875rem;font-weight:600;color:var(--appai-vn-text-secondary);white-space:nowrap}
body.appai-vn-page #main .hero-assurance i{color:var(--appai-vn-blue-600);font-size:15px}

/* Hero mockup — floating animation, no frame */
body.appai-vn-page #main .hero-mockup{
  overflow:hidden;
  animation:appai-vn-mock-float 6s ease-in-out infinite}
body.appai-vn-page #main .hero-mockup img{display:block;width:100%;height:auto}
@keyframes appai-vn-mock-float{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-8px)}}

/* (Logo bar removed) */

/* ============================================================
   HOW IT WORKS — 4 Steps with polished cards
   ============================================================ */
body.appai-vn-page #main .steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--appai-vn-sp-5);position:relative}
body.appai-vn-page #main .steps-grid::before{content:'';position:absolute;top:30px;left:calc(12.5% + 28px);
  right:calc(12.5% + 28px);height:1px;
  background:var(--appai-vn-border);z-index:0}

body.appai-vn-page #main .step-card{text-align:center;position:relative;z-index:1;
  padding:var(--appai-vn-sp-6) var(--appai-vn-sp-4);border-radius:var(--appai-vn-r-lg);
  background:var(--appai-vn-bg);border:1px solid var(--appai-vn-border);
  transition:all .4s var(--appai-vn-ease-out)}
body.appai-vn-page #main .step-card:hover{border-color:var(--appai-vn-blue-100);
  transform:translateY(-5px);box-shadow:var(--appai-vn-shadow-card-hover)}

body.appai-vn-page #main .step-num{font-size:.75rem;font-weight:700;color:var(--appai-vn-blue-600);
  letter-spacing:.08em;margin-bottom:var(--appai-vn-sp-3);opacity:.45}
body.appai-vn-page #main .step-icon{width:52px;height:52px;border-radius:var(--appai-vn-r-md);display:flex;
  align-items:center;justify-content:center;font-size:1.3rem;margin:0 auto var(--appai-vn-sp-4);
  background:var(--appai-vn-blue-50);color:var(--appai-vn-blue-600);
  border:1px solid var(--appai-vn-blue-100);
  transition:all .35s var(--appai-vn-ease-spring)}
body.appai-vn-page #main .step-card:hover .step-icon{
  background:var(--appai-vn-blue-600);color:#fff;
  box-shadow:0 6px 20px rgba(0,92,224,.25);
  border-color:var(--appai-vn-blue-600);
  transform:scale(1.08) rotate(-3deg)}
body.appai-vn-page #main .step-card h3{font-size:1.0625rem;font-weight:600;margin-bottom:var(--appai-vn-sp-2);color:var(--appai-vn-text-primary)}
body.appai-vn-page #main .step-card p{font-size:.9375rem;color:var(--appai-vn-text-secondary);line-height:1.7}

/* ============================================================
   FEATURES GRID — cards with subtle gradient border on hover
   ============================================================ */
body.appai-vn-page #main .ch-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--appai-vn-sp-5)}
body.appai-vn-page #main .ch-card{background:var(--appai-vn-bg);border:1px solid var(--appai-vn-border);border-radius:var(--appai-vn-r-lg);
  padding:var(--appai-vn-sp-8);text-align:center;transition:all .4s var(--appai-vn-ease-out);
  position:relative;overflow:hidden}
body.appai-vn-page #main .ch-card::after{content:'';position:absolute;inset:0;opacity:0;
  background:linear-gradient(135deg,rgba(0,92,224,.02),rgba(124,58,237,.02));
  transition:opacity .4s var(--appai-vn-ease)}
body.appai-vn-page #main .ch-card:hover{transform:translateY(-5px);border-color:var(--appai-vn-blue-100);
  box-shadow:var(--appai-vn-shadow-card-hover)}
body.appai-vn-page #main .ch-card:hover::after{opacity:1}

body.appai-vn-page #main .ch-icon{width:52px;height:52px;border-radius:var(--appai-vn-r-md);margin:0 auto var(--appai-vn-sp-4);
  display:flex;align-items:center;justify-content:center;font-size:1.3rem;position:relative;z-index:1;
  transition:all .35s var(--appai-vn-ease-spring)}
body.appai-vn-page #main .ch-icon.accent-blue{background:var(--appai-vn-blue-50);color:var(--appai-vn-blue-600);border:1px solid var(--appai-vn-blue-100)}
body.appai-vn-page #main .ch-icon.accent-cyan{background:var(--appai-vn-cyan-50);color:var(--appai-vn-cyan-600);border:1px solid rgba(8,145,178,.15)}
body.appai-vn-page #main .ch-icon.accent-violet{background:var(--appai-vn-violet-50);color:var(--appai-vn-violet-600);border:1px solid var(--appai-vn-violet-100)}
body.appai-vn-page #main .ch-icon.accent-emerald{background:var(--appai-vn-emerald-50);color:var(--appai-vn-emerald-600);border:1px solid var(--appai-vn-emerald-100)}

/* Icon glow + spring on card hover */
body.appai-vn-page #main .ch-card:hover .ch-icon{transform:scale(1.1) rotate(-5deg)}
body.appai-vn-page #main .ch-card:hover .ch-icon.accent-blue{box-shadow:0 6px 20px rgba(0,92,224,.18)}
body.appai-vn-page #main .ch-card:hover .ch-icon.accent-cyan{box-shadow:0 6px 20px rgba(8,145,178,.16)}
body.appai-vn-page #main .ch-card:hover .ch-icon.accent-violet{box-shadow:0 6px 20px rgba(124,58,237,.14)}
body.appai-vn-page #main .ch-card:hover .ch-icon.accent-emerald{box-shadow:0 6px 20px rgba(5,150,105,.14)}

body.appai-vn-page #main .ch-card h3{font-size:1.125rem;font-weight:600;margin-bottom:var(--appai-vn-sp-2);color:var(--appai-vn-text-primary);position:relative;z-index:1}
body.appai-vn-page #main .ch-card p{font-size:1rem;color:var(--appai-vn-text-secondary);line-height:1.7;position:relative;z-index:1}

/* ============================================================
   BENEFITS — Stats grid with accent line
   ============================================================ */
body.appai-vn-page #main .stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--appai-vn-sp-5)}
body.appai-vn-page #main .stat-item{text-align:center;padding:var(--appai-vn-sp-8) var(--appai-vn-sp-5);border-radius:var(--appai-vn-r-lg);
  background:var(--appai-vn-bg);border:1px solid var(--appai-vn-border);
  transition:all var(--appai-vn-duration-slow) var(--appai-vn-ease-out)}
body.appai-vn-page #main .stat-item:hover{border-color:var(--appai-vn-blue-100);
  box-shadow:var(--appai-vn-shadow-card-hover);transform:translateY(-2px)}
body.appai-vn-page #main .stat-icon{width:48px;height:48px;border-radius:var(--appai-vn-r-md);margin:0 auto var(--appai-vn-sp-4);
  display:flex;align-items:center;justify-content:center;font-size:1.25rem;
  background:var(--appai-vn-blue-50);color:var(--appai-vn-blue-600);
  border:1px solid var(--appai-vn-blue-100);transition:all var(--appai-vn-duration) var(--appai-vn-ease)}
body.appai-vn-page #main .stat-item:hover .stat-icon{
  background:var(--appai-vn-blue-600);color:#fff;
  box-shadow:0 4px 12px rgba(0,92,224,.2);border-color:var(--appai-vn-blue-600)}
body.appai-vn-page #main .stat-num{font-size:1.1875rem;font-weight:700;color:var(--appai-vn-text-primary);line-height:1.3}
body.appai-vn-page #main .stat-label{font-size:.9375rem;color:var(--appai-vn-text-secondary);margin-top:var(--appai-vn-sp-2);line-height:1.7}

/* ============================================================
   PROBLEM → SOLUTION — cleaner contrast
   ============================================================ */
body.appai-vn-page #main .ps-grid{display:grid;grid-template-columns:1fr 1fr;gap:var(--appai-vn-sp-6)}
body.appai-vn-page #main .ps-card{border-radius:var(--appai-vn-r-lg);padding:var(--appai-vn-sp-8);border:1px solid;
  transition:all .4s var(--appai-vn-ease-out)}
body.appai-vn-page #main .ps-card:hover{transform:translateY(-5px)}
body.appai-vn-page #main .ps-before{background:var(--appai-vn-rose-50);border-color:var(--appai-vn-rose-100)}
body.appai-vn-page #main .ps-before:hover{box-shadow:0 16px 40px rgba(225,29,72,.08);border-color:var(--appai-vn-rose-400)}
body.appai-vn-page #main .ps-after{background:var(--appai-vn-emerald-50);border-color:var(--appai-vn-emerald-100)}
body.appai-vn-page #main .ps-after:hover{box-shadow:0 16px 40px rgba(5,150,105,.08);border-color:var(--appai-vn-emerald-500)}
body.appai-vn-page #main .ps-card h3{font-size:1.125rem;font-weight:700;margin-bottom:var(--appai-vn-sp-5);display:flex;align-items:center;gap:var(--appai-vn-sp-2)}
body.appai-vn-page #main .ps-before h3{color:var(--appai-vn-rose-600)}body.appai-vn-page #main .ps-after h3{color:var(--appai-vn-emerald-600)}
body.appai-vn-page #main .ps-list{display:flex;flex-direction:column;gap:var(--appai-vn-sp-4)}
body.appai-vn-page #main .ps-list li{display:flex;align-items:flex-start;gap:10px;font-size:1rem;line-height:1.65;color:var(--appai-vn-text-secondary)}
body.appai-vn-page #main .ps-list li i{flex-shrink:0;margin-top:3px;font-size:.9375rem}
body.appai-vn-page #main .ps-before .ps-list li i{color:var(--appai-vn-rose-400)}
body.appai-vn-page #main .ps-after .ps-list li i{color:var(--appai-vn-emerald-500)}

/* ============================================================
   TESTIMONIALS — Infinite marquee scroll
   ============================================================ */
body.appai-vn-page #main .test-marquee-wrap{position:relative;overflow:hidden;padding:0 0 var(--appai-vn-sp-4)}
body.appai-vn-page #main .test-marquee-wrap::before,body.appai-vn-page #main .test-marquee-wrap::after{content:'';position:absolute;top:0;bottom:0;width:100px;z-index:2;pointer-events:none}
body.appai-vn-page #main .test-marquee-wrap::before{left:0;background:linear-gradient(90deg,var(--appai-vn-bg),transparent)}
body.appai-vn-page #main .test-marquee-wrap::after{right:0;background:linear-gradient(90deg,transparent,var(--appai-vn-bg))}

body.appai-vn-page #main .test-marquee{overflow:hidden}
body.appai-vn-page #main .test-marquee + .test-marquee{margin-top:var(--appai-vn-sp-4)}

body.appai-vn-page #main .test-marquee-track{display:flex;gap:var(--appai-vn-sp-5);width:max-content;
  animation:appai-vn-test-scroll var(--appai-vn-marquee-duration,40s) linear infinite}
body.appai-vn-page #main .test-marquee-row2 .test-marquee-track{animation-direction:reverse}
body.appai-vn-page #main .test-marquee-set{display:flex;align-items:stretch;gap:var(--appai-vn-sp-5)}
@keyframes appai-vn-test-scroll{0%{transform:translateX(0)}100%{transform:translateX(-50%)}}

body.appai-vn-page #main .test-card-m{flex-shrink:0;width:360px;background:var(--appai-vn-bg);border:1px solid var(--appai-vn-border);
  border-radius:var(--appai-vn-r-lg);padding:var(--appai-vn-sp-6);position:relative;box-sizing:border-box;
  transition:border-color var(--appai-vn-duration),box-shadow var(--appai-vn-duration)}
body.appai-vn-page #main .test-card-m:hover{border-color:var(--appai-vn-blue-100);box-shadow:var(--appai-vn-shadow-md)}

body.appai-vn-page #main .test-stars{display:flex;align-items:center;gap:2px;line-height:1;margin:0 0 var(--appai-vn-sp-3)}
body.appai-vn-page #main .test-stars :is(i,span){color:var(--appai-vn-amber-400);font-size:.85rem;font-style:normal}
body.appai-vn-page #main .test-quote{
  margin:0 0 var(--appai-vn-sp-4)!important;padding:0!important;border:0!important;
  color:var(--appai-vn-text-secondary);font:400 .9375rem/1.75 var(--appai-vn-font);font-style:normal!important}
body.appai-vn-page #main .test-author{display:flex;align-items:center;gap:12px}
body.appai-vn-page #main .test-av{width:40px;height:40px;border-radius:50%;display:block;overflow:hidden;flex:0 0 40px;
  background:var(--appai-vn-bg-muted);box-shadow:0 0 0 2px #fff,0 0 0 3px var(--appai-vn-border)}
body.appai-vn-page #main .test-avatar-image{display:block;width:100%;height:100%;margin:0;object-fit:cover;object-position:center}
body.appai-vn-page #main .test-author-copy{min-width:0}
body.appai-vn-page #main .test-av.t1{background:var(--appai-vn-blue-600)}
body.appai-vn-page #main .test-av.t2{background:var(--appai-vn-violet-600)}
body.appai-vn-page #main .test-av.t3{background:var(--appai-vn-emerald-600)}
body.appai-vn-page #main .test-name{color:var(--appai-vn-text-primary);font-size:.9375rem;font-weight:600;line-height:1.35}
body.appai-vn-page #main .test-role{margin-top:2px;color:var(--appai-vn-text-tertiary);font-size:.8125rem;line-height:1.4}

/* ============================================================
   FAQ — refined with smoother transitions
   ============================================================ */
body.appai-vn-page #main .faq-list{max-width:680px;margin:0 auto;display:flex;flex-direction:column;gap:var(--appai-vn-sp-2)}
body.appai-vn-page #main .faq-item{background:var(--appai-vn-bg);border:1px solid var(--appai-vn-border);border-radius:var(--appai-vn-r-md);
  overflow:hidden;transition:all var(--appai-vn-duration-slow) var(--appai-vn-ease-out)}
body.appai-vn-page #main .faq-item:hover{border-color:var(--appai-vn-border-hover)}
body.appai-vn-page #main .faq-item.open{border-color:var(--appai-vn-blue-100);box-shadow:0 0 0 3px rgba(0,92,224,.04),var(--appai-vn-shadow-sm)}
body.appai-vn-page #main .faq-q{display:flex;align-items:center;justify-content:space-between;width:100%;
  padding:20px 24px;background:none;border:none;cursor:pointer;font-family:var(--appai-vn-font);
  font-size:1.0625rem;font-weight:600;color:var(--appai-vn-text-primary);text-align:left;gap:var(--appai-vn-sp-3);
  line-height:normal;min-height:0;transition:color var(--appai-vn-duration)}
body.appai-vn-page #main .faq-q:hover{color:var(--appai-vn-blue-600)}
body.appai-vn-page #main .faq-icon{width:26px;height:26px;border-radius:50%;background:var(--appai-vn-bg-muted);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
  font-size:.8rem;color:var(--appai-vn-text-tertiary);transition:all var(--appai-vn-duration) var(--appai-vn-ease)}
body.appai-vn-page #main .faq-item.open .faq-icon{
  background:var(--appai-vn-blue-600);
  color:#fff;transform:rotate(45deg);
  box-shadow:0 2px 6px rgba(0,92,224,.2)}
body.appai-vn-page #main .faq-a{max-height:0;overflow:hidden;transition:max-height var(--appai-vn-duration-slow) var(--appai-vn-ease)}
body.appai-vn-page #main .faq-item.open .faq-a{max-height:300px}
body.appai-vn-page #main .faq-a-inner{padding:0 24px 22px;font-size:1rem;color:var(--appai-vn-text-secondary);line-height:1.8}

/* ============================================================
   CTA — rich gradient background with depth
   ============================================================ */
body.appai-vn-page #main .cta-section{padding:var(--appai-vn-sp-24) 0;text-align:center;position:relative;overflow:hidden;
  background:linear-gradient(180deg,#eef4ff 0%,#DCEAFF 100%)}
body.appai-vn-page #main .cta-glow{position:absolute;width:520px;height:320px;top:50%;left:50%;
  transform:translate(-50%,-50%);border-radius:50%;
  background:radial-gradient(ellipse,rgba(0,92,224,.08),transparent 70%);
  filter:blur(70px);pointer-events:none;animation:appai-vn-float-slow 14s ease-in-out infinite}
body.appai-vn-page #main .cta-content{max-width:620px;margin:0 auto;position:relative;z-index:1}
body.appai-vn-page #main .cta-content h2{font-size:2.25rem;margin-bottom:var(--appai-vn-sp-4);font-weight:800}
body.appai-vn-page #main .cta-content>p{font-size:1.125rem;color:var(--appai-vn-text-secondary);margin-bottom:var(--appai-vn-sp-8);line-height:1.75}
body.appai-vn-page #main .cta-buttons{margin-bottom:var(--appai-vn-sp-5)}

/* CTA primary button appai-vn-pulse glow */
body.appai-vn-page #main .cta-buttons .btn-primary{animation:appai-vn-cta-appai-vn-pulse 3s ease-in-out infinite}
@keyframes appai-vn-cta-appai-vn-pulse{
  0%,100%{box-shadow:0 1px 3px rgba(0,0,0,.12),0 4px 14px var(--appai-vn-blue-glow)}
  50%{box-shadow:0 2px 8px rgba(0,0,0,.1),0 8px 32px rgba(0,92,224,.3)}}

/* Trust row (CTA section) */
body.appai-vn-page #main .trust-row{display:flex;flex-wrap:wrap;gap:var(--appai-vn-sp-5)}
body.appai-vn-page #main .trust-row.center{justify-content:center}
body.appai-vn-page #main .trust-row span{display:inline-flex;align-items:center;gap:6px;
  font-size:.875rem;font-weight:500;color:var(--appai-vn-text-secondary)}
body.appai-vn-page #main .trust-row i{color:var(--appai-vn-emerald-500);font-size:.9375rem}

/* ============================================================
   BLOG / NEWS GRID
   ============================================================ */
body.appai-vn-page #main .blog-grid{display:grid;grid-template-columns:repeat(var(--appai-vn-blog-columns,3),1fr);gap:var(--appai-vn-sp-6)}
body.appai-vn-page #main .blog-card{display:flex;flex-direction:column;background:var(--appai-vn-bg);border:1px solid var(--appai-vn-border);
  border-radius:var(--appai-vn-r-lg);overflow:hidden;text-decoration:none;color:inherit;
  transition:all .4s var(--appai-vn-ease-out)}
body.appai-vn-page #main .blog-card:hover{transform:translateY(-6px);border-color:var(--appai-vn-blue-100);
  box-shadow:var(--appai-vn-shadow-lg)}
body.appai-vn-page #main .blog-card-link{display:flex;flex:1;flex-direction:column;color:inherit;text-decoration:none}
body.appai-vn-page #main .blog-img{position:relative;height:180px;overflow:hidden}
body.appai-vn-page #main .blog-img>img{width:100%;height:100%;object-fit:cover;transition:transform .45s var(--appai-vn-ease-out)}
body.appai-vn-page #main .blog-card:hover .blog-img>img{transform:scale(1.045)}
body.appai-vn-page #main .blog-img-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;
  background:var(--appai-vn-bg-muted);font-size:2.5rem;color:var(--appai-vn-blue-300);
  transition:all var(--appai-vn-duration-slow) var(--appai-vn-ease-out)}
body.appai-vn-page #main .blog-card:hover .blog-img-placeholder{background:var(--appai-vn-blue-50);color:var(--appai-vn-blue-500);transform:scale(1.05)}
body.appai-vn-page #main .blog-tag{position:absolute;top:12px;left:12px;padding:4px 12px;border-radius:var(--appai-vn-r-full);
  font-size:.7rem;font-weight:600;letter-spacing:.04em;text-transform:uppercase;
  background:var(--appai-vn-bg);color:var(--appai-vn-blue-600);border:1px solid var(--appai-vn-border);
  box-shadow:var(--appai-vn-shadow-xs)}
body.appai-vn-page #main .blog-body{padding:var(--appai-vn-sp-5) var(--appai-vn-sp-5) var(--appai-vn-sp-6);flex:1;display:flex;flex-direction:column}
body.appai-vn-page #main .blog-body h3{font-size:1.0625rem;font-weight:700;color:var(--appai-vn-text-primary);margin-bottom:var(--appai-vn-sp-2);
  line-height:1.4;letter-spacing:-.015em}
body.appai-vn-page #main .blog-body p{font-size:.9375rem;color:var(--appai-vn-text-tertiary);line-height:1.7;flex:1}
body.appai-vn-page #main .blog-link{display:inline-flex;align-items:center;gap:6px;margin-top:var(--appai-vn-sp-3);
  font-size:.875rem;font-weight:600;color:var(--appai-vn-blue-600);
  transition:gap var(--appai-vn-duration) var(--appai-vn-ease)}
body.appai-vn-page #main .blog-card:hover .blog-link{gap:10px}
body.appai-vn-page #main .blog-link i{font-size:.85rem}
body.appai-vn-page #main .blog-cta{text-align:center;margin-top:var(--appai-vn-sp-10)}

/* ============================================================
   FOOTER — clean with subtle depth
   ============================================================ */
body.appai-vn-page #main .site-footer{background:var(--appai-vn-bg-elevated);border-top:1px solid var(--appai-vn-border-subtle);padding:48px 0 24px}
body.appai-vn-page #main .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:var(--appai-vn-sp-8);margin-bottom:var(--appai-vn-sp-10)}
body.appai-vn-page #main .footer-logo{display:flex;align-items:center;gap:var(--appai-vn-sp-2);margin-bottom:var(--appai-vn-sp-3)}
body.appai-vn-page #main .footer-logo span{font-weight:800;font-size:1.125rem;color:var(--appai-vn-text-primary)}
body.appai-vn-page #main .footer-brand p{font-size:.875rem;color:var(--appai-vn-text-tertiary);line-height:1.7;max-width:280px}
body.appai-vn-page #main .footer-social{display:flex;gap:var(--appai-vn-sp-2);margin-top:var(--appai-vn-sp-4)}
body.appai-vn-page #main .footer-social a{width:32px;height:32px;border-radius:var(--appai-vn-r-sm);border:1px solid var(--appai-vn-border);
  display:flex;align-items:center;justify-content:center;color:var(--appai-vn-text-tertiary);
  font-size:.85rem;transition:all var(--appai-vn-duration) var(--appai-vn-ease);background:var(--appai-vn-bg)}
body.appai-vn-page #main .footer-social a:hover{color:var(--appai-vn-blue-600);border-color:var(--appai-vn-blue-100);
  background:var(--appai-vn-blue-50);transform:translateY(-1px)}
body.appai-vn-page #main .footer-links h4{font-size:.75rem;font-weight:600;color:var(--appai-vn-text-primary);
  text-transform:uppercase;letter-spacing:.07em;margin-bottom:var(--appai-vn-sp-4)}
body.appai-vn-page #main .footer-links ul{display:flex;flex-direction:column;gap:var(--appai-vn-sp-3)}
body.appai-vn-page #main .footer-links a{font-size:.9375rem;color:var(--appai-vn-text-tertiary);transition:color var(--appai-vn-duration)}
body.appai-vn-page #main .footer-links a:hover{color:var(--appai-vn-blue-600)}
body.appai-vn-page #main .footer-bottom{border-top:1px solid var(--appai-vn-border-subtle);padding-top:var(--appai-vn-sp-5);
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px}
body.appai-vn-page #main .footer-bottom p{font-size:.8125rem;color:var(--appai-vn-text-tertiary)}
body.appai-vn-page #main .footer-bottom strong{color:var(--appai-vn-text-secondary)}
body.appai-vn-page #main .footer-bottom-links{display:flex;gap:var(--appai-vn-sp-5)}
body.appai-vn-page #main .footer-bottom-links a{font-size:.8125rem;color:var(--appai-vn-text-tertiary)}
body.appai-vn-page #main .footer-bottom-links a:hover{color:var(--appai-vn-blue-600)}

/* Back to top — refined */
body.appai-vn-page #main .btt{position:fixed;bottom:24px;right:24px;width:40px;height:40px;border-radius:var(--appai-vn-r-md);
  background:var(--appai-vn-bg);
  border:1px solid var(--appai-vn-border);box-shadow:var(--appai-vn-shadow-md);
  color:var(--appai-vn-text-tertiary);font-size:.95rem;display:flex;align-items:center;justify-content:center;
  cursor:pointer;z-index:900;opacity:0;visibility:hidden;transform:translateY(6px);
  transition:all var(--appai-vn-duration) var(--appai-vn-ease)}
body.appai-vn-page #main .btt.visible{opacity:1;visibility:visible;transform:translateY(0)}
body.appai-vn-page #main .btt:hover{color:var(--appai-vn-blue-600);border-color:var(--appai-vn-blue-100);background:var(--appai-vn-blue-50);
  transform:translateY(-2px);box-shadow:var(--appai-vn-shadow-lg)}

/* Mobile overlay */
body.appai-vn-page #main .mob-overlay{position:fixed;inset:0;background:rgba(15,23,42,.2);backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
  z-index:1100;opacity:0;visibility:hidden;transition:all var(--appai-vn-duration)}
body.appai-vn-page #main .mob-overlay.active{opacity:1;visibility:visible}
body.appai-vn-page #main .mob-sidebar{position:fixed;top:0;left:0;bottom:0;width:280px;max-width:85vw;
  background:var(--appai-vn-bg);border-right:1px solid var(--appai-vn-border);z-index:1200;
  transform:translateX(-100%);transition:transform var(--appai-vn-duration-slow) var(--appai-vn-ease-out);
  display:flex;flex-direction:column}
body.appai-vn-page #main .mob-sidebar.active{transform:translateX(0)}
body.appai-vn-page #main .mob-head{display:flex;align-items:center;gap:10px;padding:14px 18px;border-bottom:1px solid var(--appai-vn-border-subtle)}
body.appai-vn-page #main .mob-brand{font-weight:800;font-size:1rem;color:var(--appai-vn-text-primary);flex:1}
body.appai-vn-page #main .mob-x{background:none;border:none;color:var(--appai-vn-text-tertiary);font-size:1.1rem;cursor:pointer;padding:4px}
body.appai-vn-page #main .mob-x:hover{color:var(--appai-vn-text-primary)}
body.appai-vn-page #main .mob-links{flex:1;padding:16px 18px}
body.appai-vn-page #main .mob-links a{display:block;color:var(--appai-vn-text-secondary);font-size:.9rem;font-weight:500;
  padding:11px 0;border-bottom:1px solid var(--appai-vn-border-subtle);transition:color var(--appai-vn-duration)}
body.appai-vn-page #main .mob-links a:hover{color:var(--appai-vn-blue-600)}
body.appai-vn-page #main .mob-bottom{padding:16px 18px;border-top:1px solid var(--appai-vn-border-subtle)}
body.appai-vn-page #main .mob-bottom .btn{width:100%;justify-content:center}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media(max-width:1024px){
  body.appai-vn-page #main .hero-inner{grid-template-columns:1fr;gap:36px;text-align:center}
  body.appai-vn-page #main .hero-copy{max-width:560px;margin:0 auto}
  body.appai-vn-page #main .hero-sub{margin-left:auto;margin-right:auto}
  body.appai-vn-page #main .hero-cta{justify-content:center;flex-wrap:wrap}
  body.appai-vn-page #main .hero-assurance{justify-content:center}
  body.appai-vn-page #main .trust-row{justify-content:center}
  body.appai-vn-page #main .ps-grid{grid-template-columns:1fr}
  body.appai-vn-page #main .steps-grid{grid-template-columns:repeat(2,1fr);gap:var(--appai-vn-sp-4)}
  body.appai-vn-page #main .steps-grid::before{display:none}
  body.appai-vn-page #main .ch-grid{grid-template-columns:1fr 1fr}
  body.appai-vn-page #main .stats-grid{grid-template-columns:repeat(2,1fr)}
  body.appai-vn-page #main .blog-grid{grid-template-columns:1fr 1fr}
  body.appai-vn-page #main .footer-grid{grid-template-columns:1fr 1fr;gap:var(--appai-vn-sp-6)}
}
@media(max-width:768px){
  body.appai-vn-page #main .mob-toggle{display:block}
  body.appai-vn-page #main .header-nav,body.appai-vn-page #main .header-login,body.appai-vn-page #main .header-social,body.appai-vn-page #main .lang-switch{display:none}
  body.appai-vn-page #main .site-header{top:8px;padding:0 var(--appai-vn-sp-3)}
  body.appai-vn-page #main .header-inner{padding:0 6px 0 var(--appai-vn-sp-4);height:54px;border-radius:16px}
  body.appai-vn-page #main .site-header.scrolled{top:6px}
  body.appai-vn-page #main .site-header.scrolled .header-inner{height:50px}
  body.appai-vn-page #main .section{padding:var(--appai-vn-sp-16) 0}
  body.appai-vn-page #main .hero{padding-top:calc(var(--appai-vn-sp-20) + 24px)}
  body.appai-vn-page #main .hero-mockup{order:-1}
  body.appai-vn-page #main .ch-grid{grid-template-columns:1fr}
  body.appai-vn-page #main .stats-grid{grid-template-columns:1fr 1fr}
  body.appai-vn-page #main .blog-grid{grid-template-columns:1fr}
  body.appai-vn-page #main .footer-grid{grid-template-columns:1fr 1fr}
  body.appai-vn-page #main .hero-cta{justify-content:center}
  body.appai-vn-page #main .email-form-inner{flex-direction:column;border-radius:var(--appai-vn-r-lg);padding:6px}
  body.appai-vn-page #main .email-form .email-icon{display:none}
  body.appai-vn-page #main .email-form input{padding:12px 14px;text-align:center}
  body.appai-vn-page #main .email-form .btn{width:100%;justify-content:center}
  body.appai-vn-page #main .steps-grid{grid-template-columns:1fr 1fr}
  body.appai-vn-page #main .cta-content h2{font-size:1.75rem}
  body.appai-vn-page #main .test-card-m{width:300px}
}
@media(max-width:480px){
  body.appai-vn-page #main .container{padding:0 var(--appai-vn-sp-4)}
  body.appai-vn-page #main .hero h1{font-size:1.875rem}
  body.appai-vn-page #main .section-header h2{font-size:1.5rem}
  body.appai-vn-page #main .stats-grid{grid-template-columns:1fr}
  body.appai-vn-page #main .steps-grid{grid-template-columns:1fr}
  body.appai-vn-page #main .footer-grid{grid-template-columns:1fr}
  body.appai-vn-page #main .footer-bottom{flex-direction:column;text-align:center}
}