:root {
  --bg: #f2f5f8;
  --surface: #ffffff;
  --surface-2: #eef2f6;
  --ink: #131a22;
  --ink-2: #43505e;
  --muted: #74828f;
  --line: #dde4ea;
  --accent: #0f56cc;
  --accent-ink: #ffffff;
  --accent-soft: #e5edfd;
  --ok: #17784c;
  --ok-soft: #e0f2e8;
  --crit: #b03a31;
  --crit-soft: #fbe6e4;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(19, 26, 34, .05), 0 10px 30px -22px rgba(19, 26, 34, .5);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Be Vietnam Pro", ui-sans-serif, system-ui, "Segoe UI", sans-serif;
  font-size: 14.5px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.mono, .num { font-family: "JetBrains Mono", ui-monospace, monospace; font-variant-numeric: tabular-nums; }
.dim { color: var(--muted); }
.strong { font-weight: 600; color: var(--ink); }
.r { text-align: right; }

/* ---------- brand ---------- */

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand:hover { text-decoration: none; }
.brand.center { justify-content: center; margin-bottom: 20px; }
.logo {
  display: block; width: 176px; height: auto;
  /* logo có nền trong suốt nên hiển thị tốt trên mọi nền sáng */
}
.brand.center .logo { width: 232px; margin: 0 auto; }
@media (max-width: 860px) { .logo { width: 128px; } }

/* ---------- layout ---------- */

.shell { display: grid; grid-template-columns: 232px 1fr; min-height: 100vh; }

.side {
  background: var(--surface);
  border-right: 1px solid var(--line);
  padding: 20px 16px;
  display: flex; flex-direction: column; gap: 26px;
}
.side nav { display: flex; flex-direction: column; gap: 2px; }
.nav-label {
  font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted); margin: 14px 0 4px 10px;
}
.nav-label:first-child { margin-top: 0; }
.side nav a {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: 7px;
  color: var(--ink-2); font-weight: 500; font-size: 14px;
}
.side nav a:hover { background: var(--surface-2); text-decoration: none; }
.side nav a.on { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

.main { display: flex; flex-direction: column; min-width: 0; }

.top {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 14px 26px;
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
}
.top h1 { margin: 0; font-size: 18px; font-weight: 600; letter-spacing: -.01em; }
.top-right { margin-left: auto; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }

.wallet {
  display: flex; align-items: baseline; gap: 8px;
  background: var(--surface-2); padding: 6px 14px; border-radius: 999px;
}
.wallet span { font-size: 12px; color: var(--muted); }
.wallet b { font-family: "JetBrains Mono", monospace; font-size: 14px; color: var(--accent); }

.who { display: flex; flex-direction: column; line-height: 1.25; }
.who-code { font-family: "JetBrains Mono", monospace; font-size: 11px; color: var(--muted); }
.who-name { font-size: 13.5px; font-weight: 500; }

.content { padding: 24px 26px 56px; display: flex; flex-direction: column; gap: 20px; }

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .side { flex-direction: row; align-items: center; gap: 18px; overflow-x: auto; }
  .side nav { flex-direction: row; align-items: center; }
  .nav-label { display: none; }
  .content { padding: 18px 16px 44px; }
  .top { padding: 12px 16px; }
}

/* ---------- stats ---------- */

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; }
.stat {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px; display: flex; flex-direction: column; gap: 4px;
}
.stat span { font-size: 12px; color: var(--muted); }
.stat b { font-family: "JetBrains Mono", monospace; font-size: 21px; font-weight: 500; letter-spacing: -.02em; }

/* ---------- panel ---------- */

.split { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 20px; align-items: start; }
@media (max-width: 980px) { .split { grid-template-columns: 1fr; } }

.panel {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden;
}
.panel-head {
  padding: 13px 18px; border-bottom: 1px solid var(--line);
  display: flex; align-items: baseline; gap: 12px;
}
.panel-head h2 { margin: 0; font-size: 15px; font-weight: 600; }
.count { margin-left: auto; font-size: 12px; color: var(--muted); font-family: "JetBrains Mono", monospace; }
.pad { padding: 18px; }

.empty { padding: 42px 18px; text-align: center; }
.empty p { margin: 0 0 4px; font-weight: 500; }
.empty span { font-size: 13px; color: var(--muted); }

/* ---------- table ---------- */

.tw { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 13.5px; }
th {
  text-align: left; padding: 10px 14px; white-space: nowrap;
  font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--muted); font-weight: 600;
  border-bottom: 1px solid var(--line); background: var(--surface-2);
}
td { padding: 11px 14px; border-bottom: 1px solid var(--line); color: var(--ink-2); vertical-align: middle; }
tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: rgba(15, 86, 204, .04); }
td .sub { display: block; font-size: 11.5px; color: var(--muted); }
td .sub.bad { color: var(--crit); }
.plus { color: var(--ok); font-weight: 600; }
.minus { color: var(--crit); font-weight: 600; }

.pill {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  font-size: 11.5px; font-weight: 600; white-space: nowrap;
}
.pill.ok { background: var(--ok-soft); color: var(--ok); }
.pill.crit { background: var(--crit-soft); color: var(--crit); }
.pill.acc { background: var(--accent-soft); color: var(--accent); }
.pill.plain { background: var(--surface-2); color: var(--muted); }

.tag {
  display: inline-block; padding: 2px 9px; border-radius: 5px;
  background: var(--surface-2); border: 1px solid var(--line);
  font-size: 12px; color: var(--ink-2);
}

/* ---------- forms ---------- */

.form { display: flex; flex-direction: column; gap: 13px; }
.form label { display: flex; flex-direction: column; gap: 5px; font-size: 12.5px; font-weight: 500; color: var(--ink-2); }
.form .sub { font-weight: 400; font-size: 11.5px; color: var(--muted); }
.row { display: flex; gap: 10px; }
.row .grow { flex: 1 1 auto; min-width: 0; }
.row .shrink { flex: 0 1 92px; }

input, select {
  font: inherit; font-size: 14px; color: var(--ink);
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 7px; padding: 8px 11px; width: 100%;
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: var(--accent); }
input::placeholder { color: #a8b3bd; }

.inline { display: flex; gap: 6px; align-items: center; }
.inline input[type="number"] { width: 96px; }
.inline input[type="text"] { width: 130px; }

.btn {
  font: inherit; font-size: 14px; font-weight: 600;
  border-radius: 7px; padding: 9px 16px; cursor: pointer;
  border: 1px solid transparent; white-space: nowrap;
}
.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: var(--surface); color: var(--ink-2); border-color: var(--line); }
.btn.ghost:hover { background: var(--surface-2); }
.btn.sm { padding: 6px 11px; font-size: 12.5px; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
a.btn { display: inline-block; text-align: center; text-decoration: none; }
a.btn:hover { text-decoration: none; }

.quick { display: flex; gap: 7px; flex-wrap: wrap; }

/* ---------- flash ---------- */

.flash { padding: 10px 14px; border-radius: 8px; font-size: 13.5px; font-weight: 500; }
.flash.ok { background: var(--ok-soft); color: var(--ok); }
.flash.err { background: var(--crit-soft); color: var(--crit); }

/* ---------- auth ---------- */

.auth-body { display: grid; place-items: center; min-height: 100vh; padding: 40px 20px; }
.auth { width: 100%; max-width: 400px; }
.auth .card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 14px; box-shadow: var(--shadow); padding: 26px;
  display: flex; flex-direction: column; gap: 14px;
}
.auth h1 { margin: 0; font-size: 21px; font-weight: 600; letter-spacing: -.02em; }
.hint { margin: 0; font-size: 13px; color: var(--muted); }
.alt { text-align: center; font-size: 13.5px; color: var(--muted); margin: 18px 0 0; }

/* ---------- nút mua trên sidebar ---------- */

.btn.block { display: block; width: 100%; text-align: center; }

/* ---------- panel head có nút ---------- */

.panel-head .btn { margin-left: 8px; }
.panel-head .count + .btn { margin-left: 10px; }
.empty .btn { margin-top: 14px; }

/* ---------- menu thao tác ---------- */

.menu { position: relative; display: inline-block; }
.menu > summary { list-style: none; user-select: none; }
.menu > summary::-webkit-details-marker { display: none; }
.menu > summary::after { content: " ▾"; font-size: 10px; }
.menu[open] > summary { background: var(--surface-2); border-color: var(--accent); }

.menu-body {
  position: absolute; right: 0; top: calc(100% + 6px); z-index: 20;
  min-width: 250px; text-align: left;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 10px; box-shadow: 0 12px 32px -12px rgba(19, 26, 34, .35);
  padding: 10px; display: flex; flex-direction: column; gap: 4px;
}
.menu-title {
  display: block; font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--muted); font-weight: 600; margin-bottom: 6px;
}
.menu-form { display: block; }
.menu-row { display: flex; gap: 6px; }
.menu-row select { flex: 1 1 auto; min-width: 0; font-size: 13px; padding: 6px 8px; }
.menu-sep { height: 1px; background: var(--line); margin: 8px 0 4px; }

.menu-item {
  display: block; width: 100%; text-align: left;
  font: inherit; font-size: 13.5px; font-weight: 500; color: var(--ink-2);
  background: none; border: none; border-radius: 6px;
  padding: 7px 9px; cursor: pointer;
}
.menu-item:hover { background: var(--surface-2); }
.menu-item.danger { color: var(--crit); }
.menu-item.danger:hover { background: var(--crit-soft); }
.menu-item:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

/* ---------- pill trạng thái tạm dừng ---------- */

.pill.warn { background: #fbf0da; color: #8a5c07; }

/* ---------- thẻ chọn gói ---------- */

.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 12px; }
.plan {
  display: flex; flex-direction: column; gap: 5px;
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px; background: var(--surface); color: var(--ink-2);
  text-decoration: none;
}
.plan:hover { border-color: var(--accent); text-decoration: none; }
.plan.on { border-color: var(--accent); background: var(--accent-soft); box-shadow: inset 0 0 0 1px var(--accent); }
.plan-group { font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.plan-name { font-size: 15px; font-weight: 600; color: var(--ink); }
.plan-desc { font-size: 12.5px; color: var(--muted); }
.plan-foot { display: flex; align-items: center; gap: 10px; margin-top: 6px; flex-wrap: wrap; }
.plan-price { font-family: "JetBrains Mono", monospace; font-size: 15px; color: var(--accent); font-weight: 500; }
.plan-price i { font-style: normal; font-size: 11.5px; color: var(--muted); }

/* ---------- tổng tiền ---------- */

.buy-form { max-width: 460px; }
.total {
  display: flex; align-items: baseline; gap: 12px;
  background: var(--surface-2); border-radius: 8px; padding: 12px 14px;
}
.total span { font-size: 13px; color: var(--muted); }
.total b {
  margin-left: auto;
  font-family: "JetBrains Mono", monospace; font-size: 20px; color: var(--accent); font-weight: 600;
}

/* ---------- tab trong trang quản lý proxy ---------- */

.tabs {
  display: flex; gap: 4px; align-items: stretch;
  padding: 0 12px; border-bottom: 1px solid var(--line);
  background: var(--surface); overflow-x: auto;
}
.tab {
  display: inline-flex; align-items: center; gap: 8px; white-space: nowrap;
  padding: 13px 14px 11px; border-bottom: 2px solid transparent;
  color: var(--muted); font-size: 13.5px; font-weight: 500;
}
.tab:hover { color: var(--ink); text-decoration: none; }
.tab.on { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

.tab-icon { display: inline-flex; }
.tab-icon svg {
  width: 15px; height: 15px;
  fill: none; stroke: currentColor; stroke-width: 1.4;
  stroke-linecap: round; stroke-linejoin: round;
}

.tab-count {
  font-family: "JetBrains Mono", monospace; font-size: 11px; font-weight: 500;
  background: var(--surface-2); color: var(--muted);
  border-radius: 999px; padding: 1px 7px; min-width: 20px; text-align: center;
}
.tab.on .tab-count { background: var(--accent-soft); color: var(--accent); }

.warn-tag { background: #fbf0da; border-color: #f0dcae; color: #8a5c07; }

/* ---------- hướng dẫn nạp tiền ---------- */

.guide p { margin: 0 0 10px; max-width: 78ch; color: var(--ink-2); }
.guide p:last-of-type { margin-bottom: 16px; }

.warn-box {
  background: #fdf6e8; border: 1px solid #f0dcae; border-radius: 8px;
  padding: 12px 16px; color: #6f4b06;
}
.warn-box b { display: block; font-size: 13px; margin-bottom: 6px; }
.warn-box ul { margin: 0; padding-left: 18px; font-size: 13.5px; }
.warn-box li { margin-bottom: 4px; }
.warn-box li:last-child { margin-bottom: 0; }

.qr-block {
  display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 26px;
  padding: 4px 18px 18px; align-items: start;
}
@media (max-width: 780px) { .qr-block { grid-template-columns: 1fr; } }

.qr-card {
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  border: 1px solid var(--line); border-radius: 12px; padding: 16px;
  background: var(--surface);
}
.qr-brand {
  font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted); font-weight: 600;
}
.qr-img { width: 100%; line-height: 0; }
.qr-img svg { width: 100%; height: auto; display: block; shape-rendering: crispEdges; }
.qr-amount { font-family: "JetBrains Mono", monospace; font-size: 18px; font-weight: 600; color: var(--accent); }
.qr-note { font-size: 12px; color: var(--muted); text-align: center; }

.qr-info { display: flex; flex-direction: column; gap: 12px; }
.kv { display: flex; flex-direction: column; gap: 3px; }
.kv > span { font-size: 12px; color: var(--muted); }
.kv-value { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.kv-value b { font-size: 15px; font-weight: 600; color: var(--ink); }
.kv-value b.accent { color: var(--crit); letter-spacing: .02em; }

.copy {
  font: inherit; font-size: 11.5px; font-weight: 600; cursor: pointer;
  color: var(--accent); background: var(--accent-soft);
  border: none; border-radius: 5px; padding: 3px 9px;
}
.copy:hover { filter: brightness(.96); }
.copy.done { background: var(--ok-soft); color: var(--ok); }
.copy:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.amount-form { max-width: 340px; margin-top: 6px; }
.quick .btn.on { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

.demo-box {
  display: flex; gap: 20px; align-items: center; flex-wrap: wrap;
  border-top: 1px dashed var(--line); background: var(--surface-2);
}
.demo-box > div { flex: 1 1 280px; }
.demo-box b { font-size: 13px; }
.demo-box .hint { margin-top: 3px; }
.demo-box .inline input { width: 130px; }

/* ---------- thông tin đăng nhập proxy: ẩn cho tới khi bấm ---------- */

.reveal {
  font: inherit; font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 13px; color: var(--muted);
  background: none; border: none; padding: 2px 0; cursor: pointer;
  border-bottom: 1px dashed var(--line-strong, #c3ced7);
  letter-spacing: .04em; white-space: nowrap;
}
.reveal:hover { color: var(--ink-2); border-bottom-color: var(--accent); }
.reveal.on { color: var(--ink); letter-spacing: 0; border-bottom-style: solid; border-bottom-color: var(--accent-soft); }
.reveal:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }


/* ---------- biểu tượng nét ---------- */

.icon {
  width: 17px; height: 17px; flex: none;
  fill: none; stroke: currentColor; stroke-width: 1.6;
  stroke-linecap: round; stroke-linejoin: round;
}
.side nav a .icon { color: var(--muted); }
.side nav a:hover .icon { color: var(--ink-2); }
.side nav a.on .icon { color: var(--accent); }

.btn .icon { width: 16px; height: 16px; margin-right: 6px; vertical-align: -3px; }
.btn.block { display: flex; align-items: center; justify-content: center; gap: 0; }

.plan-name { display: flex; align-items: center; gap: 8px; }
.plan-name .icon { width: 18px; height: 18px; color: var(--accent); }

/* ---------- nhãn có link phụ ---------- */

.label-row { display: flex; align-items: baseline; gap: 10px; }
.label-row a { margin-left: auto; font-size: 12px; font-weight: 500; }