/* ===== Theme tokens (dark default + light override via [data-theme=light]) ===== */
:root{
  --bg:#0b1220; --bg2:#0f172a; --surface:#161f33; --surface2:#0f1729;
  --border:#26314a; --border2:#1e2740;
  --text:#e6edf7; --muted:#8a98b0; --faint:#5b6781;
  --primary:#3b82f6; --primary-hover:#2563eb; --primary-soft:rgba(59,130,246,.15);
  --good:#34d399; --good-bg:rgba(16,185,129,.14);
  --bad:#f87171; --bad-bg:rgba(248,113,113,.14);
  --accent-grad:linear-gradient(135deg,#3b82f6,#6366f1);
  --shadow:0 10px 30px rgba(0,0,0,.35);
  --r:14px; --r-sm:9px;
}
[data-theme=light]{
  --bg:#f1f5f9; --bg2:#f8fafc; --surface:#ffffff; --surface2:#f8fafc;
  --border:#e2e8f0; --border2:#eef2f7;
  --text:#0f172a; --muted:#64748b; --faint:#94a3b8;
  --primary:#2563eb; --primary-hover:#1d4ed8; --primary-soft:rgba(37,99,235,.10);
  --good:#059669; --good-bg:rgba(5,150,105,.12);
  --bad:#dc2626; --bad-bg:rgba(220,38,38,.10);
  --shadow:0 8px 24px rgba(15,23,42,.08);
}

*{box-sizing:border-box}
html{color-scheme:dark}
[data-theme=light] html{color-scheme:light}
body{font-family:ui-sans-serif,system-ui,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);margin:0;-webkit-font-smoothing:antialiased;transition:background .25s,color .25s}
a{color:inherit}

/* ===== Header + nav ===== */
header.top{display:flex;justify-content:space-between;align-items:center;padding:14px 24px;background:var(--surface);border-bottom:1px solid var(--border)}
.brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700}
.brand .logo{width:28px;height:28px;border-radius:8px;background:var(--accent-grad);display:grid;place-items:center;color:#fff;font-size:14px;font-weight:800}
.brand .muted{font-weight:400}
.head-right{display:flex;align-items:center;gap:14px}
.theme-btn{width:36px;height:36px;border-radius:10px;border:1px solid var(--border);background:var(--surface2);color:var(--text);cursor:pointer;font-size:16px;display:grid;place-items:center;padding:0}
.theme-btn:hover{border-color:var(--primary)}
.muted{color:var(--muted);font-size:12px}.faint{color:var(--faint)}

nav.tabs{display:flex;gap:4px;background:var(--surface);border-bottom:1px solid var(--border);padding:0 20px}
nav.tabs a{padding:13px 16px;font-size:14px;color:var(--muted);text-decoration:none;border-bottom:2px solid transparent;font-weight:500;transition:color .15s}
nav.tabs a:hover{color:var(--text)}
nav.tabs a.active{color:var(--text);border-bottom-color:var(--primary)}

.wrap{max-width:1060px;margin:26px auto;padding:0 18px}

/* ===== Cards / boxes ===== */
.box{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:20px;margin-bottom:22px;box-shadow:var(--shadow)}
.flex-between{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
h3{font-size:16px;font-weight:650}

.row{display:flex;gap:12px;flex-wrap:wrap}.row>div{flex:1;min-width:140px}
label{display:block;font-size:12px;color:var(--muted);margin:0 0 5px;font-weight:500}
input,select{width:100%;padding:10px 12px;border-radius:var(--r-sm);border:1px solid var(--border);background:var(--surface2);color:var(--text);font-size:14px;transition:border-color .15s}
input:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}
select{width:auto}

button{padding:10px 16px;border:0;border-radius:var(--r-sm);background:var(--primary);color:#fff;font-weight:600;cursor:pointer;font-size:14px;transition:background .15s,transform .05s}
button:hover{background:var(--primary-hover)}button:active{transform:translateY(1px)}
button.sm{padding:6px 11px;font-size:12px}
button.del{background:transparent;color:var(--bad);border:1px solid var(--border)}button.del:hover{background:var(--bad-bg);border-color:var(--bad)}
button.gray{background:var(--surface2);color:var(--text);border:1px solid var(--border)}button.gray:hover{border-color:var(--primary)}
button.chip{background:var(--surface2);color:var(--muted);border:1px solid var(--border);padding:7px 12px}
button.chip.on{background:var(--primary-soft);color:var(--primary);border-color:var(--primary)}

/* ===== Stat cards ===== */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px;margin-top:16px}
.stat{background:var(--surface2);border:1px solid var(--border);border-radius:12px;padding:16px;position:relative;overflow:hidden}
.stat::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--accent-grad)}
.stat .v{font-size:28px;font-weight:750;letter-spacing:-.5px}
.stat .k{font-size:12px;color:var(--muted);margin-top:3px}
.delta{display:inline-flex;align-items:center;gap:3px;font-size:11px;font-weight:600;padding:2px 7px;border-radius:999px;margin-top:8px}
.delta.up{color:var(--good);background:var(--good-bg)}.delta.down{color:var(--bad);background:var(--bad-bg)}
.delta.flat{color:var(--muted);background:var(--border2)}

/* ===== Tables ===== */
table{width:100%;border-collapse:collapse;font-size:13.5px}
th,td{text-align:left;padding:11px 10px;border-bottom:1px solid var(--border2);vertical-align:middle}
th{color:var(--muted);font-weight:600;font-size:12px;user-select:none}
th.sortable{cursor:pointer}th.sortable:hover{color:var(--text)}
th .arr{opacity:.5;font-size:10px}
tbody tr{transition:background .12s}
tbody tr:hover{background:var(--surface2)}
a.lnk{color:var(--primary);word-break:break-all;text-decoration:none;font-weight:500}a.lnk:hover{text-decoration:underline}
.pill{font-size:11px;padding:3px 9px;border-radius:999px;font-weight:600}
.pill.on{background:var(--good-bg);color:var(--good)}.pill.off{background:var(--bad-bg);color:var(--bad)}

/* ===== Chart + toolbar ===== */
canvas{width:100%;display:block}
.chart-wrap{position:relative;margin-top:12px}
.tooltip{position:absolute;pointer-events:none;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:7px 10px;font-size:12px;box-shadow:var(--shadow);opacity:0;transition:opacity .1s;white-space:nowrap;z-index:5}
.tooltip .d{color:var(--muted)}.tooltip .c{font-weight:700;font-size:14px}
.toolbar{display:flex;gap:10px;align-items:flex-end;flex-wrap:wrap}
.toolbar .field{flex:0 0 auto}.toolbar .field input{width:auto}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:16px}.crumbs a{color:var(--primary);text-decoration:none}
.err{color:var(--bad);font-size:13px;text-align:center;margin:0 0 8px}
.searchbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:14px}
.search-field{position:relative;flex:1;min-width:200px;display:flex;align-items:center}
.search-field input{width:100%;padding-left:36px}
.search-ico{position:absolute;left:11px;display:inline-flex;color:var(--faint);pointer-events:none}
.theme-btn svg,.search-ico svg{display:block}
.lang-btn{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;border:1px solid var(--border);background:var(--surface2);color:var(--text);font-size:12px;font-weight:700;text-decoration:none}
.lang-btn:hover{border-color:var(--primary);color:var(--primary)}
.spark{display:block}
.empty{color:var(--faint);text-align:center;padding:18px}

/* ===== brand as link ===== */
.brand{text-decoration:none}
.hint{font-size:11px;display:block;margin-top:4px;color:var(--muted)}
.hint.ok{color:var(--good)}.hint.bad{color:var(--bad)}

/* ===== Landing / hero ===== */
.hero{text-align:center;padding:48px 16px 24px;max-width:760px;margin:0 auto}
.hero h1{font-size:40px;line-height:1.15;margin:0 0 14px;letter-spacing:-1px}
.hero .grad{background:var(--accent-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{font-size:16px;color:var(--muted);margin:0 auto 28px;max-width:520px}
.hero-cta{margin-top:22px;color:var(--muted);font-size:14px}
.btn-link{display:inline-block;background:var(--primary);color:#fff;padding:9px 18px;border-radius:10px;text-decoration:none;font-weight:600}
.btn-link:hover{background:var(--primary-hover)}
/* nút viền (link kiểu button, không gạch chân) */
.btn-outline{display:inline-block;background:var(--surface2);color:var(--text);border:1px solid var(--border);padding:8px 16px;border-radius:10px;text-decoration:none;font-weight:600;font-size:14px}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
/* mọi <a> không bao giờ gạch chân mặc định */
a{text-decoration:none}
.big-emoji{display:flex;justify-content:center;margin-bottom:8px}

.shorten-card{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:22px;box-shadow:var(--shadow);text-align:left;max-width:640px;margin:0 auto}
.shorten-row{display:flex;gap:10px}
.shorten-row input{flex:1;font-size:16px;padding:14px 16px}
.shorten-row button{padding:14px 24px;font-size:16px;white-space:nowrap}
.shorten-opts{display:flex;align-items:center;gap:10px;margin-top:10px}
.shorten-opts input{flex:1}
.msg{min-height:0;margin:8px 0 0;text-align:left}
.result{margin-top:16px;padding:16px;border:1px dashed var(--primary);border-radius:12px;background:var(--primary-soft)}
.result-row{display:flex;align-items:center;gap:10px;justify-content:space-between}
.result .short{font-size:18px;font-weight:700;color:var(--primary);text-decoration:none;word-break:break-all}
.result .muted{margin:8px 0 0}

/* ===== Features ===== */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px;margin:40px auto;max-width:900px}
.feat{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:22px;text-align:center}
.feat-ic{display:flex;justify-content:center;color:var(--primary);margin-bottom:10px}
.feat h3{margin:0 0 6px;font-size:16px}.feat p{margin:0;color:var(--muted);font-size:13.5px}

/* ===== Auth pages ===== */
.auth-body{display:flex;min-height:100vh;align-items:center;justify-content:center;padding:20px}
.auth-card{background:var(--surface);border:1px solid var(--border);padding:34px;border-radius:16px;width:360px;box-shadow:var(--shadow)}
.auth-card h1{margin:6px 0 18px;font-size:22px;text-align:center}
.auth-card label{margin:12px 0 5px}
.auth-card button{width:100%;margin-top:20px;padding:12px;font-size:15px}
.auth-brand{display:flex;align-items:center;gap:8px;justify-content:center;font-size:19px;font-weight:700;text-decoration:none;color:var(--text)}
.auth-alt{text-align:center;font-size:13px;color:var(--muted);margin:18px 0 0}
.auth-alt a{display:inline-block;margin-top:8px;background:var(--surface2);color:var(--text);border:1px solid var(--border);padding:8px 16px;border-radius:10px;text-decoration:none;font-weight:600}
.auth-alt a:hover{border-color:var(--primary);color:var(--primary)}

@media(max-width:560px){.hero h1{font-size:30px}.shorten-row{flex-direction:column}}