:root {
  --bg: #0f1116;
  --bg-soft: #171a22;
  --bg-row: #1c2029;
  --line: #282e3a;
  --fg: #e8ebf2;
  --fg-dim: #8b93a7;
  --accent: #4c8dff;
  --accent-soft: rgba(76, 141, 255, 0.15);
  --ok: #35d07f;
  --danger: #ff5f57;
  --radius: 10px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 60px;
}

.wrap { width: 100%; max-width: 860px; margin: 0 auto; padding: 0 16px; }
.hidden { display: none !important; }
a { color: var(--accent); }

/* ---------- Thanh tren ---------- */

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(15, 17, 22, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.top-in { display: flex; align-items: center; justify-content: space-between; height: 54px; gap: 12px; }
.brand { display: flex; align-items: center; gap: 9px; font-size: 15px; letter-spacing: 0.2px; }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent); flex: 0 0 auto; }
.top-right { display: flex; gap: 14px; font-size: 13px; color: var(--fg-dim); }
.stat b { color: var(--fg); font-variant-numeric: tabular-nums; }
.stat.dim b { color: var(--fg-dim); }

/* ---------- Hero ---------- */

.hero { padding: 40px 0 28px; text-align: center; }
.hero h1 { font-size: 30px; line-height: 1.25; font-weight: 700; letter-spacing: -0.4px; }
.hero h1 span { color: var(--accent); }
.hero p { color: var(--fg-dim); margin-top: 10px; font-size: 15px; }

.cta {
  margin-top: 22px;
  min-height: 48px;
  padding: 0 30px;
  border: none;
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.3px;
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.1s ease;
}
.cta:hover:not(:disabled) { filter: brightness(1.12); }
.cta:active:not(:disabled) { transform: translateY(1px); }
.cta:disabled { background: #2a2f3d; color: #5c6478; cursor: not-allowed; }
.cta.sm { min-height: 38px; padding: 0 18px; font-size: 14px; margin-top: 0; }

.src { margin-top: 16px; font-size: 12.5px; color: var(--fg-dim); }
.src b { color: var(--fg-dim); font-weight: 600; }

/* ---------- Thanh cong cu ---------- */

.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 8px 0 16px;
}

#search {
  flex: 1 1 180px;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg-soft);
  color: var(--fg);
  font-size: 14px;
  outline: none;
}
#search:focus { border-color: var(--accent); }

.tabs { display: flex; gap: 3px; padding: 3px; border: 1px solid var(--line); border-radius: 9px; background: var(--bg-soft); }
.tab {
  min-height: 30px;
  padding: 0 12px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--fg-dim);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.tab:hover { color: var(--fg); }
.tab.on { background: var(--accent); color: #fff; }

button.ghost {
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  color: var(--fg-dim);
  font-size: 13px;
  cursor: pointer;
}
button.ghost:hover:not(:disabled) { background: var(--bg-soft); color: var(--fg); }
button.ghost:disabled { opacity: 0.35; cursor: not-allowed; }
button.ghost.sm { min-height: 32px; font-size: 12.5px; flex: 1; }

/* ---------- Danh sach code ---------- */

.list { display: flex; flex-direction: column; gap: 6px; }

.item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--bg-row);
  transition: border-color 0.15s ease, opacity 0.2s ease;
}
.item:hover { border-color: #3a4353; }
.item.used { opacity: 0.4; }

.item .code {
  flex: 1;
  min-width: 0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  word-break: break-all;
}
.item.used .code { text-decoration: line-through; }
.item .date { flex: 0 0 auto; font-size: 12px; color: var(--fg-dim); font-variant-numeric: tabular-nums; }

.item button {
  flex: 0 0 auto;
  min-height: 32px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #242a35;
  color: var(--fg);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
}
.item button:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.item .mark { min-width: 34px; padding: 0 8px; }

.empty { text-align: center; color: var(--fg-dim); padding: 30px 0; font-size: 14px; }

.foot { padding: 34px 16px 0; text-align: center; font-size: 12.5px; color: var(--fg-dim); }

/* ---------- Modal ---------- */

.modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: rgba(6, 8, 12, 0.75);
}
.modal-box {
  width: 100%;
  max-width: 440px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg-soft);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.55);
  overflow: hidden;
}
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 10px 13px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}
.modal-body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 10px; }

.x {
  width: 30px; height: 30px;
  border: none; border-radius: 7px;
  background: transparent;
  color: var(--fg-dim);
  font-size: 14px;
  cursor: pointer;
}
.x:hover { background: #262b38; color: var(--fg); }

.pick {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-row);
  color: var(--fg);
  text-align: left;
  cursor: pointer;
}
.pick:hover { border-color: var(--accent); background: var(--accent-soft); }
.pick b { font-size: 15px; }
.pick span { font-size: 13px; color: var(--fg-dim); line-height: 1.45; }
.pick i { font-style: normal; color: var(--accent); font-weight: 700; }

#manual-input {
  width: 100%;
  min-height: 190px;
  resize: vertical;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--bg);
  color: var(--fg);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  line-height: 1.6;
  outline: none;
}
#manual-input:focus { border-color: var(--accent); }
.manual-bar { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.manual-bar span { font-size: 13px; color: var(--fg-dim); font-variant-numeric: tabular-nums; }

/* ---------- Overlay ---------- */

.overlay {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 70;
  width: 330px;
  max-width: calc(100vw - 32px);
  max-height: calc(100vh - 32px);
  display: flex;
  flex-direction: column;
  border: 1px solid #3a4353;
  border-radius: 12px;
  background: var(--bg-soft);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.6);
  overflow: hidden;
}

.ov-head {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 6px 9px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-row);
}
.ov-title { font-size: 13px; font-weight: 700; letter-spacing: 0.3px; }
.ov-prog { flex: 1; text-align: right; font-size: 12px; color: var(--fg-dim); font-variant-numeric: tabular-nums; }

.ov-body { flex: 1; min-height: 0; display: flex; flex-direction: column; gap: 10px; padding: 12px; }
.overlay.mini .ov-body { display: none; }

.ov-current {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 16px 12px;
  border: 1px solid var(--accent);
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--fg);
  cursor: pointer;
}
.ov-current:hover { background: rgba(76, 141, 255, 0.24); }
.ov-current span {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 1px;
  word-break: break-all;
  text-align: center;
}
.ov-current small { font-size: 11.5px; color: var(--fg-dim); }
.ov-current.flash { animation: flash 0.45s ease; }
@keyframes flash {
  0% { background: var(--ok); border-color: var(--ok); }
  100% { background: var(--accent-soft); border-color: var(--accent); }
}

.ov-track { flex: 0 0 auto; height: 3px; border-radius: 2px; background: var(--line); overflow: hidden; }
.ov-fill { height: 100%; width: 0; background: var(--accent); transition: width 0.25s ease; }

.ov-list {
  flex: 1;
  min-height: 60px;
  max-height: 210px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.ov-list::-webkit-scrollbar { width: 8px; }
.ov-list::-webkit-scrollbar-thumb { background: #2f3543; border-radius: 4px; }

.ov-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: var(--bg-row);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12px;
  cursor: pointer;
}
.ov-row .n { color: var(--fg-dim); min-width: 22px; text-align: right; font-size: 10.5px; }
.ov-row .t { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ov-row[data-s="next"] { border-color: var(--accent); background: var(--accent-soft); }
.ov-row[data-s="recent"] { opacity: 0.4; }
.ov-row[data-s="old"] { opacity: 0.15; }
.ov-row[data-s="recent"]:hover, .ov-row[data-s="old"]:hover { opacity: 0.85; }

.ov-done {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 14px;
  border: 1px solid rgba(53, 208, 127, 0.4);
  border-radius: 10px;
  background: rgba(53, 208, 127, 0.1);
}
.ov-done .tick {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--ok);
  color: #0d1117;
  font-size: 19px;
  font-weight: 800;
}
.ov-done b { color: var(--ok); font-size: 16px; letter-spacing: 2px; }
.ov-done span { font-size: 11.5px; color: var(--fg-dim); }

.ov-foot { flex: 0 0 auto; display: flex; gap: 6px; }

/* ---------- Toast ---------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translate(-50%, 8px);
  z-index: 90;
  padding: 9px 16px;
  border-radius: 20px;
  background: var(--ok);
  color: #0d1117;
  font-size: 13px;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
  max-width: 80vw;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- Man hinh hep ---------- */

@media (max-width: 600px) {
  .hero { padding: 30px 0 22px; }
  .hero h1 { font-size: 24px; }
  .toolbar { gap: 6px; }
  #search { flex: 1 1 100%; }
  #btn-reset { flex: 0 0 auto; }
  .tabs { flex: 1; }
  .tab { flex: 1; }
  .overlay { right: 8px; left: 8px; bottom: 8px; width: auto; }
  .item .date { display: none; }
}

/* ---------- Muc tai app ---------- */

.dl {
  margin-top: 44px;
  padding: 28px 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, var(--bg-soft), var(--bg));
  text-align: center;
}
.dl h2 { font-size: 21px; font-weight: 700; letter-spacing: -0.2px; }
.dl-lead { margin: 10px auto 0; max-width: 520px; font-size: 14px; color: var(--fg-dim); }
.dl-lead b { color: var(--fg); }

.dl-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 10px;
  margin: 22px 0;
  text-align: left;
}
.dl-feat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-row);
}
.dl-feat b { font-size: 13.5px; }
.dl-feat span { font-size: 12.5px; color: var(--fg-dim); line-height: 1.45; }

.dl-btns { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.dl-btns .cta { margin-top: 0; display: inline-flex; align-items: center; text-decoration: none; }
a.ghost.lg {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--fg-dim);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
}
a.ghost.lg:hover { background: var(--bg-soft); color: var(--fg); }

.dl-note { margin-top: 16px; font-size: 12.5px; color: var(--fg-dim); line-height: 1.6; }
.dl-note b { color: var(--fg); font-weight: 600; }

@media (max-width: 600px) {
  .dl { padding: 22px 16px; }
  .dl h2 { font-size: 18px; }
  .dl-btns .cta, a.ghost.lg { width: 100%; justify-content: center; }
}

/* ---------- Goi y phim tat ---------- */

.ov-keys {
  flex: 0 0 auto;
  margin-top: 2px;
  text-align: center;
  font-size: 10.5px;
  line-height: 1.6;
  color: var(--fg-dim);
}
.ov-keys b {
  display: inline-block;
  padding: 1px 5px;
  margin: 0 1px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg-row);
  color: var(--fg);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 10px;
  font-weight: 600;
}

b.kbd {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--bg-soft);
  color: var(--fg);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  font-weight: 600;
}

/* ---------- Trang huong dan ---------- */

.guide { max-width: 760px; }

.g-hero { padding: 36px 0 20px; }
.g-hero h1 { font-size: 27px; font-weight: 700; letter-spacing: -0.3px; line-height: 1.25; }
.g-hero p { margin-top: 10px; color: var(--fg-dim); font-size: 15px; }
.g-need { padding: 10px 13px; border: 1px solid var(--line); border-radius: 9px; background: var(--bg-soft); }
.g-need b { color: var(--fg); }

.g-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 14px 0 6px;
  border-top: 1px solid var(--line);
  margin-top: 18px;
}
.g-toc a {
  padding: 6px 11px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--bg-soft);
  color: var(--fg-dim);
  font-size: 13px;
  text-decoration: none;
}
.g-toc a:hover { border-color: var(--accent); color: var(--fg); }

.g-step { padding: 34px 0; border-bottom: 1px solid var(--line); scroll-margin-top: 70px; }
.g-step h2 {
  display: flex;
  align-items: center;
  gap: 11px;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.2px;
  line-height: 1.3;
}
.g-num {
  flex: 0 0 auto;
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 16px;
  font-weight: 800;
}
.g-step h3 { margin-top: 20px; font-size: 16px; font-weight: 700; }
.g-step p { margin-top: 11px; font-size: 15px; line-height: 1.65; }
.g-step ol, .g-step ul { margin: 11px 0 0 20px; }
.g-step li { margin-top: 7px; font-size: 15px; line-height: 1.6; }
.g-sub { margin-top: 8px; }

.g-step figure {
  margin: 18px 0 4px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #0b0d12;
}
.g-step figure img { width: 100%; height: auto; display: block; border-radius: 7px; }

.g-box {
  margin-top: 16px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 9px;
  background: var(--bg-soft);
}
.g-box b { font-size: 15px; }
.g-box p { margin-top: 7px; font-size: 14px; color: var(--fg-dim); line-height: 1.6; }
.g-box p b { color: var(--fg); font-size: 14px; }
.g-box.warn { border-left-color: #ffb340; }
.g-box.danger { border-left-color: var(--danger); }

.g-note { font-size: 13.5px; color: var(--fg-dim); }
.g-ok { color: var(--ok); font-weight: 600; }
.g-ok b { color: var(--ok); }

.g-ol li { margin-top: 10px; }

kbd {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--bg-row);
  color: var(--fg);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12.5px;
  font-weight: 600;
  white-space: nowrap;
}

.g-tbl { width: 100%; margin-top: 12px; border-collapse: collapse; font-size: 14px; }
.g-tbl td, .g-tbl th { padding: 9px 10px; border: 1px solid var(--line); text-align: left; vertical-align: top; line-height: 1.55; }
.g-tbl th { background: var(--bg-soft); font-size: 13px; color: var(--fg-dim); font-weight: 700; }
.g-tbl.wide td:first-child { width: 34%; font-weight: 600; }

/* Minh hoa man hinh SmartScreen - ve tay, khong phai anh chup */
.g-mock {
  margin-top: 16px;
  padding: 16px;
  border: 1px dashed #3a4353;
  border-radius: 12px;
  background: var(--bg-soft);
}
.g-mock-tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 9px;
  border-radius: 12px;
  background: #2a3140;
  color: var(--fg-dim);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.3px;
}
.g-mock-card {
  padding: 20px;
  border-radius: 8px;
  background: #0067b8;
  color: #fff;
}
.g-mock-card b { font-size: 18px; font-weight: 600; }
.g-mock-card p { margin-top: 10px; font-size: 13.5px; line-height: 1.55; opacity: 0.95; }
.g-mock-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 13.5px;
  text-decoration: underline;
  opacity: 0.9;
}
.g-mock-btns { margin-top: 18px; display: flex; justify-content: flex-end; }
.g-mock-btn {
  padding: 7px 22px;
  border: 1px solid rgba(255,255,255,.7);
  font-size: 13.5px;
}
.g-mock-steps { margin-top: 14px; display: flex; flex-direction: column; gap: 8px; }
.g-mock-steps div {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: 14px;
  line-height: 1.55;
}
.g-mock-steps b:first-child {
  flex: 0 0 auto;
  width: 21px; height: 21px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: #ffb340;
  color: #12141a;
  font-size: 12px;
  font-weight: 800;
}

.g-end { padding: 34px 0 10px; text-align: center; }
.g-end p { color: var(--fg-dim); font-size: 14px; }
.g-end .cta { display: inline-flex; align-items: center; text-decoration: none; }

@media (max-width: 600px) {
  .g-hero h1 { font-size: 22px; }
  .g-step h2 { font-size: 18px; }
  .g-step figure { padding: 6px; }
  .g-tbl { font-size: 13px; }
  .g-tbl.wide td:first-child { width: 40%; }
  .g-tbl td, .g-tbl th { padding: 7px 8px; }
}

.top-link { color: var(--fg-dim); text-decoration: none; font-size: 13px; }
.top-link:hover { color: var(--accent); }
@media (max-width: 600px) { .top-right .stat.dim { display: none; } }

/* Thuoc tinh width/height tren the <img> da tu tinh ty le, chi can nen toi
   de khung khong nhap nhay trong luc anh dang tai */
.g-step figure img { background: #12141a; }

/* ---------- Video huong dan ---------- */

.g-video {
  margin: 8px 0 6px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, var(--bg-soft), var(--bg));
  text-align: center;
  scroll-margin-top: 70px;
}
.g-video h2 { font-size: 19px; font-weight: 700; letter-spacing: -0.2px; }
.g-video-sub { margin-top: 7px; font-size: 13.5px; color: var(--fg-dim); }
.g-video video {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
  margin: 18px auto 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #0b0d12;
}
.g-video .g-note { margin-top: 14px; }

@media (max-width: 600px) {
  .g-video { padding: 16px 12px; }
  .g-video video { max-width: 100%; }
}

/* Nut tai o thanh tren cung - khoi phai cuon het danh sach code */
.top-dl {
  padding: 5px 11px;
  border: 1px solid var(--accent);
  border-radius: 7px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12.5px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}
.top-dl:hover { background: var(--accent); color: #fff; }

/* Khoi tai nam gon hon khi o dau trang, de danh cho ngay danh sach code */
.dl { margin-top: 10px; margin-bottom: 10px; scroll-margin-top: 66px; }

@media (max-width: 600px) {
  .top-right .stat { display: none; }
  .top-link { display: none; }
  .top-link.home { display: inline; align-self: center; }
}

/* Tren dien thoai, khoi tai da nam dau trang nen bo 3 the tinh nang cho gon,
   nguoi dung toi day de lay code truoc da. Chi tiet van con o trang huong dan. */
@media (max-width: 600px) {
  .dl-grid { display: none; }
  .dl { padding: 18px 14px; }
  .dl h2 { font-size: 17px; }
  .dl-lead { font-size: 13.5px; }
  .dl-note { font-size: 12px; }
  .dl-btns { gap: 8px; }
}