:root {
  --bg: #0e1020;
  --card: #171a2e;
  --card2: #1f233d;
  --line: #2c3157;
  --txt: #e9ecff;
  --mut: #a3a8d0;
  --acc: #6c5ce7;
  --acc2: #00d2b8;
  --err: #ff6b81;
  --radius: 14px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, #23264a 0%, var(--bg) 55%);
  color: var(--txt);
  line-height: 1.55;
}
a { color: var(--acc2); }
main { max-width: 900px; margin: 0 auto; padding: 0 16px 48px; }

/* Hero */
.hero { max-width: 760px; margin: 0 auto; padding: 40px 16px 8px; text-align: center; }
.brand { font-weight: 800; letter-spacing: .5px; opacity: .9; }
.brand span { color: var(--acc2); }
.hero h1 { font-size: clamp(26px, 5vw, 40px); margin: 10px 0 6px; }
.sub { color: var(--mut); max-width: 620px; margin: 0 auto 22px; }
.inputbar { display: flex; gap: 8px; background: var(--card); border: 1px solid var(--line); padding: 8px; border-radius: var(--radius); }
.inputbar input { flex: 1; background: transparent; border: 0; color: var(--txt); font-size: 16px; padding: 10px 12px; outline: none; }
.inputbar input::placeholder { color: #6f74a0; }

button, .btn {
  font: inherit; cursor: pointer; border: 1px solid var(--line);
  background: var(--card2); color: var(--txt); padding: 11px 18px;
  border-radius: 10px; text-decoration: none; display: inline-flex; align-items: center; gap: 6px;
}
button:disabled { opacity: .55; cursor: progress; }
.primary { background: linear-gradient(135deg, var(--acc), #8a7bff); border-color: transparent; font-weight: 700; color: #fff; }
.primary:hover { filter: brightness(1.08); }
.wide { width: 100%; justify-content: center; margin-top: 12px; }

.status { min-height: 22px; margin: 12px 2px 0; color: var(--mut); font-size: 14px; }
.status.error { color: var(--err); }
.badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 18px; color: var(--mut); font-size: 13px; margin: 8px 0 0; }
.badges span { white-space: nowrap; }

/* Cards */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin-top: 22px; }
.result-grid { display: grid; grid-template-columns: minmax(0, 240px) 1fr; gap: 20px; }
.media video { width: 100%; border-radius: 10px; background: #000; aspect-ratio: 9/16; object-fit: contain; }
.info h2 { font-size: 18px; margin: 6px 0; }
.cover { display: none; }
.meta { color: var(--mut); font-size: 14px; margin: 0 0 14px; }
.dl-row { display: flex; flex-wrap: wrap; gap: 10px; }
.hint { color: var(--mut); font-size: 13px; margin: 12px 0 0; }
.hint.small { font-size: 12px; }

/* Gallery ảnh slideshow */
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); gap: 8px; margin-top: 14px; }
.thumb { display: block; border-radius: 8px; overflow: hidden; border: 1px solid var(--line); position: relative; }
.thumb img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 9/16; display: block; }
.thumb::after { content: "⬇"; position: absolute; right: 5px; bottom: 5px; background: rgba(0,0,0,.55); border-radius: 5px; padding: 1px 6px; font-size: 12px; }

/* Editor */
.editor { margin-top: 20px; border-top: 1px solid var(--line); padding-top: 8px; }
.editor summary { cursor: pointer; font-weight: 700; padding: 8px 0; }
.pro { font-size: 11px; font-weight: 700; color: #0b0d18; background: var(--acc2); border-radius: 20px; padding: 2px 9px; margin-left: 6px; vertical-align: middle; }
.editor-grid { display: grid; grid-template-columns: 1fr minmax(0, 340px); gap: 22px; margin-top: 10px; }
fieldset { border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px 14px; margin: 0 0 14px; }
legend { padding: 0 6px; color: var(--acc2); font-weight: 600; font-size: 14px; }
label { display: block; font-size: 13px; color: var(--mut); margin-top: 8px; }
label.chk { display: flex; align-items: center; gap: 8px; margin-top: 22px; }
select, input[type=number], input[type=text], input[type=url] {
  width: 100%; margin-top: 4px; background: var(--card2); border: 1px solid var(--line);
  color: var(--txt); border-radius: 8px; padding: 8px 10px; font: inherit; outline: none;
}
input[type=range] { width: 100%; margin-top: 8px; accent-color: var(--acc); }
input[type=color] { width: 100%; height: 38px; margin-top: 4px; background: var(--card2); border: 1px solid var(--line); border-radius: 8px; }
input[type=file] { font-size: 12px; margin-top: 4px; color: var(--mut); }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.preview-wrap { text-align: center; }
.preview-label { display: block; font-size: 13px; color: var(--mut); margin-bottom: 6px; }
.preview-label b { color: var(--txt); }
#preview { max-width: 100%; border-radius: 10px; border: 1px solid var(--line); background: #000; }
.bar { height: 8px; background: var(--card2); border-radius: 6px; margin-top: 12px; overflow: hidden; }
.bar-fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--acc), var(--acc2)); transition: width .2s; }

/* Features */
.features h3, .how h3, .faq h3 { margin-top: 0; }
.feat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin-top: 6px; }
.feat-grid > div { background: var(--card2); border: 1px solid var(--line); border-radius: 10px; padding: 14px; }
.feat-grid b { display: block; margin-bottom: 4px; }
.feat-grid span { color: var(--mut); font-size: 14px; }

/* How-to */
.how ol { padding-left: 20px; color: var(--mut); }
.how li { margin: 6px 0; }
.devices { color: var(--mut); font-size: 14px; margin: 10px 0 0; }
.devices b { color: var(--txt); }

/* FAQ */
.faq details { border-bottom: 1px solid var(--line); padding: 4px 0; }
.faq summary { cursor: pointer; font-weight: 600; padding: 10px 0; }
.faq p { color: var(--mut); margin: 0 0 12px; }

.disclaimer { text-align: center; font-size: 12px; color: #7d82ad; margin: 18px 0 0; }
footer { text-align: center; color: #6a6f9a; padding: 28px 16px 40px; font-size: 13px; }

@media (max-width: 720px) {
  .result-grid { grid-template-columns: 1fr; }
  .media video { aspect-ratio: auto; max-height: 60vh; }
  .editor-grid { grid-template-columns: 1fr; }
}