/* styles.css - giao diện responsive đơn giản */
:root{
  /* Light theme (MangaToon-inspired) */
  --bg-top: #fff5f8;
  --bg-bottom: #ffffff;
  --card:#ffffff;
  --brand-pink: #ff3b6b; /* primary pink */
  --brand-red: #ff1f4b;  /* accent red */
  --brand-white: #ffffff;
  --muted:#6b7280; /* gray for metadata */
  --text:#0f1724; /* dark text for readability */
  --site-header-height: 56px;
}
*{box-sizing:border-box}
/* Mobile-first base styles */
/* allow wider container so tablets can show two-column layout */
.container{max-width:920px;margin:0 auto;padding:1rem}
body{font-family:Segoe UI, Roboto, Arial, sans-serif;margin:0;background:linear-gradient(180deg,var(--bg-top),var(--bg-bottom));color:var(--text);min-height:100vh;padding-top:calc(var(--site-header-height) + 12px);padding-bottom:120px}
.site-header{background:var(--card);backdrop-filter:blur(6px);position:fixed;top:0;left:0;right:0;margin:0 auto;max-width:920px;width:100%;z-index:115;border-radius:0 0 12px 12px;padding:.4rem;border:1px solid rgba(15,23,36,0.04)}
.site-header .container{display:flex;align-items:center;gap:1rem;justify-content:center}
.logo{margin:0;padding:.45rem 0;font-size:1.1rem;color:var(--brand-pink);font-weight:700}
/* site logo image */
.site-logo{height:36px;display:block}
.menu-toggle{display:none;background:none;border:0;color:var(--text);font-size:1.5rem}
.main-nav{display:none !important}
.main-nav ul{list-style:none;margin:0;padding:0}
.main-nav a{display:block;padding:.6rem .9rem;color:var(--text);text-decoration:none;border-radius:6px}
.main-nav a:hover, .main-nav a:focus{background:rgba(255,255,255,0.04)}
.panel{display:none;padding:1.25rem;margin-top:1rem;background:transparent;border-radius:8px}
.panel.active{display:block}
h2{margin-top:0}
.btn{display:inline-block;padding:.6rem .9rem;background:var(--brand-pink);color:var(--brand-white);border-radius:8px;text-decoration:none;border:0;font-weight:700;cursor:pointer;box-shadow:0 6px 18px rgba(255,59,107,0.12)}

/* Bottom nav (mobile-first) */

.bottom-nav{position:fixed;left:8px;right:8px;bottom:12px;display:flex;gap:8px;justify-content:space-between;background:transparent;padding:.25rem;border-radius:14px;z-index:110}
.bottom-nav::before{content:'';position:absolute;inset:0;border-radius:16px;background:linear-gradient(180deg,#0f172a,#111827);box-shadow:0 10px 30px rgba(15,23,42,0.28);border:1px solid rgba(255,255,255,0.08);opacity:0.98}
.bottom-nav > *{position:relative}
.bn-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;flex:1;color:var(--brand-white);text-decoration:none;padding:.65rem .45rem;border-radius:10px;min-height:62px;font-weight:700;font-size:14px}
.bn-item .bn-icon{font-size:20px;line-height:1}
/* replace emoji icons with image placeholders */
.bn-icon-img{
  width:30px;
  height:30px;
  display:block;
  object-fit:contain;
  padding:4px;
  border-radius:8px;
  background:rgba(255,255,255,0.12);
  border:1px solid rgba(255,255,255,0.35);
}
.bn-item .bn-label{font-size:13px}
.bn-item:active,.bn-item:focus{outline:3px solid rgba(255,255,255,0.12);transform:translateY(1px)}

/* individual subtle background for items to create comic-style buttons */
.bn-item:nth-child(1){background:linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));}
.bn-item:nth-child(2){background:linear-gradient(180deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));}
.bn-item:nth-child(3){background:linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));}
.bn-item:nth-child(4){background:linear-gradient(180deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));}
.bn-item:nth-child(5){background:linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));}

/* Contrast effects for menubar buttons (hover / focus / active) */
/* Applies to bottom nav items and header/menu buttons for clearer feedback */
.bn-item, .main-nav a, .menu-toggle {
  transition: background-color .14s ease, color .14s ease, transform .12s ease, box-shadow .14s ease, filter .14s ease;
}

.bn-item:hover, .bn-item:focus {
  background: rgba(255,255,255,0.09);
  transform: translateY(-3px) scale(1.02);
  filter: brightness(1.03) saturate(1.04);
  box-shadow: 0 10px 24px rgba(15,23,36,0.08);
  color: var(--brand-white);
}

.bn-item:active { transform: translateY(0) scale(.995); box-shadow:0 6px 14px rgba(15,23,36,0.06); }

/* stronger, high-contrast 'selected' appearance for the current tab */
.bn-item.active, .bn-item[aria-current="page"]{
  background: var(--brand-white);
  color: var(--brand-pink);
  box-shadow: 0 10px 28px rgba(15,23,36,0.08);
  transform: translateY(-3px) scale(1.02);
}

/* Header/menu contrast */
.main-nav a:hover, .main-nav a:focus {
  background: rgba(15,23,36,0.04);
  color: var(--brand-pink);
  border-radius:8px;
}

.menu-toggle:hover, .menu-toggle:focus {
  background: rgba(0,0,0,0.06);
  color: var(--brand-pink);
  border-radius:8px;
  outline: none;
}

/* Accessible focus-visible outline (keyboard users) */
.bn-item:focus-visible, .main-nav a:focus-visible, .menu-toggle:focus-visible {
  outline: 3px solid rgba(255,59,107,0.14);
  outline-offset:2px;
}

/* reader overlay removed (site uses a dedicated read.html) */

.site-footer{margin-top:2rem;padding:1rem 0;color:var(--muted);text-align:center}

/* Cards & homepage: mobile-first: 1 column; tablet: 2 columns */
.cards{display:grid;grid-template-columns:1fr;gap:12px;margin-top:12px}
.card{background:var(--card);color:var(--text);padding:12px;border-radius:12px;box-shadow:0 6px 18px rgba(15,23,36,0.06);border:1px solid rgba(15,23,36,0.04);display:flex;flex-direction:column;min-height:220px}
.card-hero{height:110px;overflow:hidden;border-radius:10px;margin-bottom:10px}
.card-hero img{width:100%;height:100%;object-fit:cover;display:block}
.card-body{display:flex;flex-direction:column;flex:1}
.card h3{margin:0 0 6px 0;color:var(--brand-pink);font-size:1rem}
.card-desc{margin:0;color:var(--muted);margin-top:auto}
.card a{display:inline-block}

/* content card for article pages */
.content-card{background:var(--card);color:var(--text);padding:14px;border-radius:12px;box-shadow:0 6px 20px rgba(15,23,36,0.06);border:1px solid rgba(15,23,36,0.04)}

/* hero images responsive */
.hero img{width:100%;height:auto;border-radius:10px;box-shadow:0 10px 30px rgba(15,23,36,0.06);display:block}

/* Force mobile layout at all viewport sizes */
.menu-toggle{display:none}
.main-nav{display:none}

@media (min-width:700px){
  /* Tablet and up: two cards per row */
  .cards{grid-template-columns:1fr 1fr;gap:16px}
}

@media (max-width:420px){
  .bn-item .bn-label{font-size:12px}
}

/* Smaller devices tweaks */
@media (max-width:360px){
  :root{ --site-header-height:52px }
  body{padding-top:calc(var(--site-header-height) + 8px)}
  .card-hero{height:96px}
}

@media (min-width:421px){
  /* allow a slightly larger header gap on desktop-sized windows while still mobile-first */
  body{padding-top:calc(var(--site-header-height) + 20px)}
}

/* Reader page overrides: make the iframe fill entire viewport and hide chrome */
.reader-page{padding-top:0 !important; padding-bottom:0 !important}
.reader-page .site-header,
.reader-page .bottom-nav,
.reader-page .site-footer,
.reader-page .container{display:none}
.reader-page .reader-only{display:flex;position:fixed;inset:0;z-index:9999;background:#000}
.reader-page .reader-only iframe{width:100%;height:100%;border:0}

/* Exit button on reader page */
.reader-exit{position:fixed;left:12px;top:12px;z-index:10001;background:rgba(0,0,0,0.6);color:#fff;border:0;padding:.5rem .75rem;border-radius:10px;font-weight:700;font-size:14px;backdrop-filter:blur(6px)}
.reader-exit:active{transform:translateY(1px)}
.reader-exit:focus{outline:3px solid rgba(255,255,255,0.12)}

/* Reusable back-to-home button used on article pages (similar to reader page) */
.back-home{position:fixed;left:12px;top:12px;z-index:10001;background:rgba(0,0,0,0.6);color:#fff;border:0;padding:.5rem .75rem;border-radius:10px;font-weight:700;font-size:14px;backdrop-filter:blur(6px);text-decoration:none}
.back-home:active{transform:translateY(1px)}
.back-home:focus{outline:3px solid rgba(255,255,255,0.12)}

/* ExitLag page enhancements */
.article-head .kicker{color:var(--muted);margin-top:6px;margin-bottom:8px}
.highlight{background:linear-gradient(90deg, rgba(255,234,240,0.9), rgba(255,245,250,0.9));border-radius:12px;padding:12px;margin:12px 0;border:1px solid rgba(255,59,107,0.06)}
.feature-list{display:flex;flex-direction:column;gap:8px;margin:8px 0 0 0;padding:0 0 0 0}
.feature-list li{list-style:none;background:transparent;padding:6px 0;font-weight:600}
.quick-start ol{padding-left:1.2rem}
.tips ul{padding-left:1.2rem}
.faq p{margin:6px 0}

/* Sticky CTA anchored above bottom nav */
/* Floating action button (circular) for ExitLag CTA */

.cta-fab{position:fixed;left:50%;transform:translateX(-50%);bottom:96px;z-index:130;display:inline-flex;align-items:center;justify-content:center;width:68px;height:68px;border-radius:50%;background:linear-gradient(135deg,var(--brand-pink),var(--brand-red));color:#fff;text-decoration:none;border:2px solid rgba(255,255,255,0.55);box-shadow:0 8px 20px rgba(255,31,75,0.28), 0 0 30px rgba(255,59,107,0.18), 0 0 60px rgba(255,59,107,0.10);transition:transform .12s ease, box-shadow .12s ease;animation:neon 2.6s ease-in-out infinite;overflow:hidden}
.cta-fab svg{display:block;fill:currentColor}
.cta-fab-icon{
  width:44px;
  height:44px;
  object-fit:cover;
  display:block;
  border-radius:50%;
  border:2px solid rgba(255,255,255,0.75);
  background:#fff;
  padding:6px;
}
.cta-fab:active{transform:translateX(-50%) translateY(2px) scale(.98)}

/* Neon glow + periodic micro-shake */
.cta-fab::after{content:"";position:absolute;inset:-6px;border-radius:50%;filter:blur(10px);opacity:0.7;pointer-events:none;animation:neon 2.6s ease-in-out infinite}
@keyframes neon{
  0%{box-shadow:0 8px 18px rgba(255,31,75,0.18), 0 0 24px rgba(255,59,107,0.12)}
  50%{box-shadow:0 12px 30px rgba(255,31,75,0.28), 0 0 48px rgba(255,59,107,0.18)}
  100%{box-shadow:0 8px 18px rgba(255,31,75,0.18), 0 0 24px rgba(255,59,107,0.12)}
}

/* subtle shake animation */
@keyframes shake{
  0%{transform:translateX(-50%) translateY(0) rotate(0deg)}
  10%{transform:translateX(-54%) translateY(-1px) rotate(-2deg)}
  30%{transform:translateX(-48%) translateY(0) rotate(2deg)}
  50%{transform:translateX(-52%) translateY(-1px) rotate(-1deg)}
  70%{transform:translateX(-50%) translateY(0) rotate(1deg)}
  100%{transform:translateX(-50%) translateY(0) rotate(0deg)}
}

/* apply micro-shake periodically via animation composition */
.cta-fab{animation:neon 2.6s ease-in-out infinite, pulse-shake 9s linear infinite}
@keyframes pulse-shake{
  0%, 80% { transform: translateX(-50%) translateY(0); }
  85% { transform: translateX(-50%) translateY(-1px) rotate(-1deg); }
  88% { transform: translateX(-50%) translateY(0) rotate(1deg); }
  90% { transform: translateX(-50%) translateY(-1px) rotate(-1deg); }
  95%,100% { transform: translateX(-50%) translateY(0); }
}

/* stronger shake on hover */
.cta-fab:hover{animation:neon 1.2s ease-in-out infinite, shake 0.6s ease-in-out 1;transform:translateX(-50%) translateY(-2px) scale(1.04)}

/* Ensure CTA doesn't overlap mobile bottom nav too closely on very small screens */
@media (max-width:420px){
  .cta-fab{bottom:110px;width:62px;height:62px}
  .cta-fab-icon{width:40px;height:40px}
}

@media (min-width:700px){
  .feature-list{flex-direction:row;gap:12px}
  .feature-list li{flex:1}
}