:root { --bg: #F6F4FA; --surface: #fff; --text: #16141F; --muted: #5E5A70; --border: #E4E0EE;
        --grad: linear-gradient(45deg, #FF8A3D, #FF4D8D 50%, #9B5CF6); color-scheme: light; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #0E0C16; --surface: #17141F; --text: #F2F0F8; --muted: #A6A1B8; --border: #2A2638; color-scheme: dark; }
  .menu { box-shadow: 0 12px 32px rgba(0,0,0,.5); }
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; background: var(--bg); color: var(--text);
       font: 16px/1.6 "Segoe UI", system-ui, -apple-system, sans-serif; }
a { color: #E8407F; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; width: 100%; max-width: 960px; margin: 0 auto; padding: 18px 16px; }
.top .brand img { display: block; height: 40px; width: auto; }
.top .brand .logo-dark { display: none; }
.auth { display: flex; align-items: center; gap: 8px; }
.btn { display: inline-flex; align-items: center; padding: 9px 16px; border-radius: 10px; font-weight: 600; font-size: 15px; text-decoration: none; white-space: nowrap; }
.btn-primary { background: var(--grad); color: #fff; }
.btn-ghost { color: var(--text); }
.btn:hover { filter: brightness(1.06); }
.btn-ghost:hover { background: var(--surface); }
.me { position: relative; }
.me summary { list-style: none; display: flex; align-items: center; gap: 10px; cursor: pointer; padding: 5px 10px 5px 5px; border-radius: 99px; border: 1px solid var(--border); background: var(--surface); }
.me summary::-webkit-details-marker { display: none; }
.me summary .name { max-width: 160px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; font-size: 15px; }
.avatar { width: 32px; height: 32px; border-radius: 50%; flex: none; object-fit: cover; }
.avatar.initial { display: grid; place-items: center; background: var(--grad); color: #fff; font-weight: 700; }
.menu { position: absolute; right: 0; top: calc(100% + 8px); min-width: 230px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
        padding: 8px; box-shadow: 0 12px 32px rgba(0,0,0,.14); z-index: 10; }
.menu .who { padding: 8px 10px 10px; border-bottom: 1px solid var(--border); margin-bottom: 6px; font-size: 14px; color: var(--muted); overflow-wrap: anywhere; }
.menu .who strong { display: block; color: var(--text); font-size: 15px; }
.menu a { display: block; padding: 9px 10px; border-radius: 8px; color: var(--text); text-decoration: none; font-size: 15px; }
.menu a:hover, .menu a:focus-visible { background: var(--bg); }
:focus-visible { outline: 3px solid #9B5CF6; outline-offset: 2px; }
main { flex: 1; width: 100%; max-width: 960px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: clamp(28px, 5vw, 44px); line-height: 1.2; margin: 24px 0 12px; letter-spacing: -.01em; }
h1 span { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { color: var(--muted); font-size: 18px; margin: 0 0 40px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.card { display: block; padding: 24px; border-radius: 16px; background: var(--surface); border: 1px solid var(--border);
        color: inherit; text-decoration: none; transition: transform .15s, border-color .15s; }
.card:hover, .card:focus-visible { transform: translateY(-2px); border-color: #FF4D8D; }
.tag { font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.card h2 { margin: 6px 0 6px; font-size: 22px; }
.card p { margin: 0; color: var(--muted); }
.soon { margin-top: 32px; color: var(--muted); font-size: 15px; }
footer { text-align: center; padding: 24px 16px; color: var(--muted); font-size: 14px; }
footer a { color: inherit; }
@media (max-width: 480px) { .me summary .name { display: none; } .me summary { padding: 4px; } .btn { padding: 8px 12px; } }
@media (prefers-reduced-motion: reduce) { .card { transition: none; } }
@media (prefers-color-scheme: dark) { .top .brand .logo-light { display: none; } .top .brand .logo-dark { display: block; } }

/* ---- trang công cụ ---- */
.crumbs { font-size: 14px; color: var(--muted); margin: 8px 0 0; }
.crumbs a { color: inherit; }
.tool h1 { font-size: clamp(26px, 4vw, 38px); margin: 12px 0 8px; }
.tool .lead { margin-bottom: 24px; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 20px; }
.fetch { display: flex; gap: 10px; flex-wrap: wrap; }
.fetch input { flex: 1 1 320px; min-width: 0; font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 12px; padding: 13px 14px; }
.fetch input:focus { outline: none; border-color: #9B5CF6; box-shadow: 0 0 0 3px rgba(155, 92, 246, .25); }
.fetch button, .btn-big { font: inherit; font-weight: 700; border: 0; border-radius: 12px; padding: 13px 22px; cursor: pointer; background: var(--grad); color: #fff; text-decoration: none; display: inline-flex; align-items: center; gap: 8px; }
.sources { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 0; padding: 0; list-style: none; font-size: 14px; }
.sources li { padding: 4px 10px; border-radius: 99px; border: 1px solid var(--border); color: var(--muted); }
.sources li.on { color: var(--text); border-color: #9B5CF6; }
.sources li small { opacity: .8; }
.note { margin: 14px 0 0; font-size: 13.5px; color: var(--muted); }
.alert { padding: 12px 14px; border-radius: 12px; margin: 16px 0 0; font-size: 15px; }
.alert.err { background: #FDECEF; color: #A3203B; }
.alert.info { background: #FFF4E5; color: #8A4B00; }
.result { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: 20px; margin-top: 20px; align-items: start; }
.result.no-media { grid-template-columns: 1fr; }
.result .media { aspect-ratio: 16 / 9; border-radius: 12px; overflow: hidden; background: #000; }
.result .media iframe, .result .media img { width: 100%; height: 100%; border: 0; object-fit: contain; display: block; }
.result h2 { margin: 0 0 6px; font-size: 20px; overflow-wrap: anywhere; }
.result dl { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; margin: 10px 0 18px; font-size: 15px; }
.result dt { color: var(--muted); }
.result dd { margin: 0; overflow-wrap: anywhere; }
.steps { margin: 28px 0 0; color: var(--muted); font-size: 15px; }
.steps h2 { color: var(--text); font-size: 18px; }
@media (max-width: 720px) { .result { grid-template-columns: 1fr; } }
@media (prefers-color-scheme: dark) {
  .alert.err { background: #3A1520; color: #FFA3B5; }
  .alert.info { background: #33240E; color: #FFC979; }
}
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }