:root {
  color-scheme: light;
  --bg: #f6f6f4;
  --surface: #fcfcfb;
  --surface-2: #f0efec;
  --border: #e3e2de;
  --text: #0b0b0b;
  --text-2: #52514e;
  --muted: #8a8984;
  --accent: #2a78d6;
  --accent-hover: #1f63b5;
  --accent-soft: #e6f0fb;
  --on-accent: #ffffff;
  --series-1: #2a78d6;
  --cat-1: #2a78d6; --cat-2: #eb6834; --cat-3: #1baf7a; --cat-4: #eda100; --cat-5: #e87ba4; --cat-other: #b4b3ad;
  --danger: #c93a39;
  --danger-soft: #fbeaea;
  --good: #0e7d3a;
  --good-soft: #e5f4ea;
  --warn: #9a6700;
  --warn-soft: #fbf1dc;
  --grid: #ecebe7;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 4px 16px rgba(0,0,0,.05);
  --radius: 12px;
  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #121211; --surface: #1a1a19; --surface-2: #232321; --border: #2f2f2c;
    --text: #ffffff; --text-2: #c3c2b7; --muted: #8f8e86;
    --accent: #3987e5; --accent-hover: #5a9cec; --accent-soft: #1b2a3d; --series-1: #3987e5;
    --cat-1: #3987e5; --cat-2: #d95926; --cat-3: #199e70; --cat-4: #c98500; --cat-5: #d55181; --cat-other: #5f5e59;
    --danger: #e66767; --danger-soft: #3a1f1f; --good: #4cc27a; --good-soft: #17301f;
    --warn: #e0a83a; --warn-soft: #362a12; --grid: #2a2a28;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 4px 16px rgba(0,0,0,.25);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #121211; --surface: #1a1a19; --surface-2: #232321; --border: #2f2f2c;
  --text: #ffffff; --text-2: #c3c2b7; --muted: #8f8e86;
  --accent: #3987e5; --accent-hover: #5a9cec; --accent-soft: #1b2a3d; --series-1: #3987e5;
    --cat-1: #3987e5; --cat-2: #d95926; --cat-3: #199e70; --cat-4: #c98500; --cat-5: #d55181; --cat-other: #5f5e59;
  --danger: #e66767; --danger-soft: #3a1f1f; --good: #4cc27a; --good-soft: #17301f;
  --warn: #e0a83a; --warn-soft: #362a12; --grid: #2a2a28;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 4px 16px rgba(0,0,0,.25);
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--text); font-family: var(--font);
  font-size: 15px; line-height: 1.5; -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5rem; letter-spacing: -0.01em; }
h1 { font-size: 1.6rem; } h2 { font-size: 1.15rem; } h3 { font-size: 1rem; }
p { margin: 0 0 1rem; }
code, .mono { font-family: var(--mono); font-size: .88em; }
.muted { color: var(--muted); } .t2 { color: var(--text-2); }
.hidden { display: none !important; }

/* ---------- controls ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  height: 38px; padding: 0 14px; border-radius: 9px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: 500 14px var(--font); cursor: pointer;
  white-space: nowrap; transition: background .15s, border-color .15s;
}
.btn:hover { background: var(--surface-2); text-decoration: none; }
.btn:disabled { opacity: .55; cursor: default; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-danger { color: var(--danger); }
.btn-danger:hover { background: var(--danger-soft); }
.btn-sm { height: 30px; padding: 0 10px; font-size: 13px; border-radius: 7px; }
.btn-ghost { border-color: transparent; background: transparent; }
.icon-btn { width: 30px; padding: 0; }

input[type=text], input[type=email], input[type=password], input[type=url], input[type=search], select, textarea {
  width: 100%; height: 40px; padding: 0 12px; border: 1px solid var(--border); border-radius: 9px;
  background: var(--surface); color: var(--text); font: 14px var(--font); outline: none;
}
textarea { height: auto; padding: 10px 12px; }
input:focus, select:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
label { display: block; font-size: 13px; font-weight: 500; color: var(--text-2); margin-bottom: 6px; }
.field { margin-bottom: 14px; }
.input-prefix { display: flex; align-items: stretch; }
.input-prefix span {
  display: flex; align-items: center; padding: 0 10px; border: 1px solid var(--border); border-right: 0;
  border-radius: 9px 0 0 9px; background: var(--surface-2); color: var(--muted); font-size: 13px; white-space: nowrap;
  max-width: 50%; overflow: hidden; text-overflow: ellipsis;
}
.input-prefix input { border-radius: 0 9px 9px 0; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.card-pad { padding: 20px; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.card-head h2 { margin: 0; }

.badge { display: inline-flex; align-items: center; gap: 4px; font-size: 12px; font-weight: 500; padding: 2px 8px; border-radius: 99px; background: var(--surface-2); color: var(--text-2); }
.badge-good { background: var(--good-soft); color: var(--good); }
.badge-bad { background: var(--danger-soft); color: var(--danger); }
.badge-warn { background: var(--warn-soft); color: var(--warn); }
.badge-accent { background: var(--accent-soft); color: var(--accent); }

.alert { padding: 10px 14px; border-radius: 9px; font-size: 14px; margin-bottom: 14px; }
.alert-error { background: var(--danger-soft); color: var(--danger); }
.alert-ok { background: var(--good-soft); color: var(--good); }

/* ---------- top nav (public pages) ---------- */
.topnav { display: flex; align-items: center; justify-content: space-between; max-width: 1100px; margin: 0 auto; padding: 18px 16px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-mark { width: 30px; height: 30px; border-radius: 8px; background: var(--accent); display: grid; place-items: center; color: #fff; }
.topnav .links { display: flex; gap: 8px; align-items: center; }

/* ---------- landing ---------- */
.hero { max-width: 760px; margin: 0 auto; padding: 64px 16px 40px; text-align: center; }
.hero h1 { font-size: clamp(2rem, 5vw, 3.1rem); letter-spacing: -0.03em; margin-bottom: 14px; }
.hero p { font-size: 1.1rem; color: var(--text-2); max-width: 560px; margin: 0 auto 28px; }
.shorten-box { display: flex; gap: 8px; padding: 8px; max-width: 640px; margin: 0 auto; }
.shorten-box input { height: 46px; border: 0; box-shadow: none !important; font-size: 15px; }
.shorten-box .btn { height: 46px; padding: 0 20px; }
.result-box { max-width: 640px; margin: 14px auto 0; display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 12px 16px; text-align: left; }
.features { max-width: 1100px; margin: 0 auto; padding: 40px 16px 80px; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.feature { padding: 22px; }
.feature .ic { width: 36px; height: 36px; border-radius: 9px; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; margin-bottom: 12px; }
.feature p { color: var(--text-2); margin: 0; font-size: 14px; }
.footer { text-align: center; color: var(--muted); font-size: 13px; padding: 24px 16px 40px; }

/* ---------- auth ---------- */
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px 16px; }
.auth-card { width: 100%; max-width: 400px; padding: 28px; }
.auth-card .brand { justify-content: center; margin-bottom: 20px; }
.auth-card h1 { text-align: center; font-size: 1.35rem; }
.auth-card .sub { text-align: center; color: var(--muted); margin-bottom: 22px; font-size: 14px; }
.auth-card .btn { width: 100%; height: 42px; }

/* ---------- app shell ---------- */
.shell { display: grid; grid-template-columns: 232px 1fr; min-height: 100vh; }
.sidebar { background: var(--surface); border-right: 1px solid var(--border); padding: 18px 12px; display: flex; flex-direction: column; gap: 4px; position: sticky; top: 0; height: 100vh; }
.sidebar .brand { padding: 4px 8px 18px; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 8px; color: var(--text-2); font-weight: 500; font-size: 14px; }
.nav-item:hover { background: var(--surface-2); text-decoration: none; color: var(--text); }
.nav-item.active { background: var(--accent-soft); color: var(--accent); }
.nav-item svg { width: 18px; height: 18px; flex: none; }
.sidebar .spacer { flex: 1; }
.user-chip { display: flex; align-items: center; gap: 10px; padding: 10px; border-top: 1px solid var(--border); margin-top: 8px; }
.avatar { width: 32px; height: 32px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; font-weight: 600; font-size: 13px; flex: none; }
.user-chip .who { min-width: 0; flex: 1; font-size: 13px; }
.user-chip .who div { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.main { padding: 28px 32px 60px; min-width: 0; }
.page-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; }
.page-head h1 { margin: 0; }
.mobile-bar { display: none; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 14px; margin-bottom: 18px; }
.stat { padding: 16px 18px; }
.stat .label { font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.stat .value { font-size: 1.7rem; font-weight: 650; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }

.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.stack { display: flex; flex-direction: column; gap: 14px; }
.row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

/* tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; font-weight: 500; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; padding: 10px 20px; border-bottom: 1px solid var(--border); white-space: nowrap; }
td { padding: 12px 20px; border-bottom: 1px solid var(--border); vertical-align: middle; }
tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.link-cell { min-width: 0; max-width: 420px; }
.link-cell .short { font-weight: 600; color: var(--text); display: inline-flex; align-items: center; gap: 6px; }
.link-cell .dest { color: var(--muted); font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: block; }
.link-cell .ttl { font-size: 13px; color: var(--text-2); }
.actions { display: flex; gap: 4px; justify-content: flex-end; }
.empty { text-align: center; padding: 48px 20px; color: var(--muted); }
.pager { display: flex; align-items: center; justify-content: space-between; padding: 12px 20px; border-top: 1px solid var(--border); font-size: 13px; color: var(--muted); }

/* charts */
.chart { position: relative; padding: 8px 20px 16px; }
.chart svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart .axis-label { fill: var(--muted); font-size: 11px; font-family: var(--font); }
.chart .gridline { stroke: var(--grid); stroke-width: 1; }
.chart .bar { fill: var(--series-1); }
.chart .bar.on { fill: var(--accent-hover); }
.tooltip { position: absolute; pointer-events: none; background: var(--text); color: var(--surface); font-size: 12px; padding: 6px 9px; border-radius: 7px; white-space: nowrap; transform: translate(-50%, -110%); opacity: 0; transition: opacity .1s; z-index: 5; }
.tooltip.show { opacity: 1; }
.tooltip b { font-variant-numeric: tabular-nums; }
.hbars { padding: 6px 20px 16px; }
.hbar { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 2px 12px; padding: 6px 0; font-size: 13px; }
.hbar .lbl { color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.hbar .val { color: var(--text-2); font-variant-numeric: tabular-nums; text-align: right; }
.hbar .track { grid-column: 1 / -1; height: 6px; border-radius: 4px; background: var(--surface-2); overflow: hidden; }
.hbar .fill { height: 100%; background: var(--series-1); border-radius: 0 4px 4px 0; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 9px; overflow: hidden; background: var(--surface); }
.seg button { border: 0; background: transparent; padding: 0 12px; height: 34px; font: 500 13px var(--font); color: var(--text-2); cursor: pointer; }
.seg button + button { border-left: 1px solid var(--border); }
.seg button.on { background: var(--accent-soft); color: var(--accent); }

/* modal */
.modal-bg { position: fixed; inset: 0; background: rgba(0,0,0,.45); display: grid; place-items: center; padding: 16px; z-index: 50; }
.modal { width: 100%; max-width: 460px; max-height: 90vh; overflow: auto; }
.modal .card-head { border-bottom: 1px solid var(--border); }
.modal-foot { display: flex; justify-content: flex-end; gap: 8px; padding: 14px 20px; border-top: 1px solid var(--border); }
.qr-box { display: grid; place-items: center; padding: 16px; background: #fff; border-radius: 10px; margin: 0 auto 12px; width: max-content; }

/* toast */
#toasts { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; gap: 8px; z-index: 100; }
.toast { background: var(--text); color: var(--surface); padding: 10px 16px; border-radius: 9px; font-size: 14px; box-shadow: var(--shadow); animation: pop .18s ease-out; }
.toast.err { background: var(--danger); color: #fff; }
@keyframes pop { from { transform: translateY(8px); opacity: 0; } }

.secret { display: flex; gap: 8px; align-items: center; padding: 10px 12px; background: var(--surface-2); border-radius: 9px; font-family: var(--mono); font-size: 13px; word-break: break-all; }
pre { background: var(--surface-2); padding: 14px; border-radius: 9px; overflow-x: auto; font-size: 13px; line-height: 1.55; margin: 0 0 1rem; }

/* docs */
.docs { max-width: 860px; margin: 0 auto; padding: 8px 16px 80px; }
.docs h2 { margin-top: 2rem; }
.endpoint { display: flex; gap: 10px; align-items: center; font-family: var(--mono); font-size: 14px; margin: 1.4rem 0 .6rem; }
.method { font-weight: 700; font-size: 12px; padding: 2px 8px; border-radius: 6px; background: var(--accent-soft); color: var(--accent); }

@media (max-width: 900px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: fixed; z-index: 40; left: 0; top: 0; width: 260px; transform: translateX(-100%); transition: transform .2s; box-shadow: var(--shadow); }
  .sidebar.open { transform: none; }
  .mobile-bar { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 30; }
  .main { padding: 20px 16px 60px; }
  th, td { padding: 10px 12px; }
  .hide-sm { display: none; }
  .link-cell { max-width: 190px; }
  .shorten-box { flex-direction: column; }
}

/* ---------- v2: donut, deltas, chat, otp ---------- */
.donut-host { container-type: inline-size; }
.donut { display: flex; flex-direction: column; align-items: stretch; gap: 14px; padding: 14px 20px 18px; }
@container (min-width: 400px) { .donut { flex-direction: row; align-items: center; gap: 24px; } }
.donut-svg { width: 140px; flex: none; margin: 0 auto; }
.donut-svg svg { width: 100%; height: auto; display: block; }
.slice { stroke: var(--surface); stroke-width: 2; transition: opacity .12s; cursor: default; }
circle.slice { stroke-width: 24; }
.slice.dim, .legend li.dim { opacity: .35; }
.donut-total { font: 650 22px var(--font); fill: var(--text); }
.donut-sub { font: 12px var(--font); fill: var(--muted); }
.legend { list-style: none; margin: 0; padding: 0; flex: 1; min-width: 0; font-size: 13px; }
.legend li { display: grid; grid-template-columns: 12px minmax(0, 1fr) auto; gap: 8px; align-items: center; padding: 5px 0; transition: opacity .12s; }
.legend .sw { width: 10px; height: 10px; border-radius: 3px; }
.legend .lg-lbl { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--text); }
.legend .lg-val { font-variant-numeric: tabular-nums; color: var(--text-2); text-align: right; }
.delta { display: inline-block; margin-top: 4px; font-size: 12px; font-weight: 500; color: var(--muted); }
.delta.up { color: var(--good); } .delta.down { color: var(--danger); }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
@media (max-width: 1250px) { .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 900px) { .grid-4 { grid-template-columns: 1fr; } }
.count-badge { margin-left: auto; min-width: 20px; height: 20px; padding: 0 6px; border-radius: 99px; background: var(--danger); color: #fff; font-size: 11px; font-weight: 600; display: inline-grid; place-items: center; }

.chat { display: flex; flex-direction: column; height: calc(100vh - 170px); min-height: 420px; }
.chat-log { flex: 1; overflow-y: auto; padding: 18px 20px; display: flex; flex-direction: column; gap: 8px; }
.bubble { max-width: 75%; padding: 9px 13px; border-radius: 14px; font-size: 14px; line-height: 1.45; white-space: pre-wrap; word-wrap: break-word; }
.bubble.me { align-self: flex-end; background: var(--accent); color: #fff; border-bottom-right-radius: 4px; }
.bubble.them { align-self: flex-start; background: var(--surface-2); color: var(--text); border-bottom-left-radius: 4px; }
.bubble .meta { display: block; font-size: 11px; opacity: .7; margin-top: 3px; }
.chat-day { align-self: center; font-size: 12px; color: var(--muted); margin: 6px 0; }
.chat-form { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--border); }
.chat-form textarea { resize: none; height: 42px; max-height: 120px; }
.inbox { display: grid; grid-template-columns: 300px 1fr; height: calc(100vh - 130px); min-height: 480px; overflow: hidden; }
.inbox-list { border-right: 1px solid var(--border); overflow-y: auto; }
.inbox-list .search { padding: 12px; border-bottom: 1px solid var(--border); }
.conv { display: block; padding: 12px 14px; border-bottom: 1px solid var(--border); color: var(--text); cursor: pointer; }
.conv:hover { background: var(--surface-2); text-decoration: none; }
.conv.active { background: var(--accent-soft); }
.conv .top { display: flex; justify-content: space-between; gap: 8px; font-size: 14px; font-weight: 600; }
.conv .top .when { font-weight: 400; font-size: 12px; color: var(--muted); white-space: nowrap; }
.conv .prev { font-size: 13px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: flex; gap: 6px; align-items: center; }
.conv .prev span:first-child { overflow: hidden; text-overflow: ellipsis; }
.inbox .chat { height: 100%; min-height: 0; }
.inbox-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 12px 18px; border-bottom: 1px solid var(--border); }
@media (max-width: 900px) {
  .inbox { grid-template-columns: 1fr; height: auto; }
  .inbox.has-active .inbox-list { display: none; }
  .inbox:not(.has-active) .inbox-thread { display: none; }
  .inbox .chat { height: calc(100vh - 200px); }
}
.otp-input { text-align: center; font-size: 26px !important; letter-spacing: 10px; height: 54px !important; font-variant-numeric: tabular-nums; }
.link-btn { background: none; border: 0; padding: 0; color: var(--accent); font: inherit; cursor: pointer; }
.link-btn:hover { text-decoration: underline; }
.link-btn:disabled { color: var(--muted); cursor: default; text-decoration: none; }
.kv { display: grid; grid-template-columns: 140px 1fr; gap: 8px 14px; font-size: 14px; }
.kv dt { color: var(--muted); } .kv dd { margin: 0; word-break: break-all; }
.export-row { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 16px 20px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.export-row:last-child { border-bottom: 0; }
.export-row p { margin: 2px 0 0; font-size: 13px; color: var(--muted); }

.mobile-only { display: none; }
@media (max-width: 900px) { .mobile-only { display: inline-flex; } }

.compact .link-cell { max-width: 230px; }