@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* ============ Design tokens ============ */
:root{
  --bg:#f6f7fb;--bg-soft:#eef0f7;--surface:#ffffff;--surface-2:#fafbff;
  --text:#0f1222;--muted:#5d6380;--border:#e4e7f1;--border-strong:#d3d8e8;
  --primary:#5b4dff;--primary-2:#8b5cf6;--accent:#06b6d4;--primary-ink:#fff;
  --grad:linear-gradient(135deg,#5b4dff 0%,#8b5cf6 55%,#d946ef 100%);
  --grad-soft:linear-gradient(135deg,rgba(91,77,255,.10),rgba(217,70,239,.08));
  --ok:#0e9f6e;--err:#e02424;--ok-bg:#ecfdf5;--err-bg:#fef2f2;--warn:#f59e0b;
  --radius:16px;--radius-sm:10px;
  --shadow-sm:0 1px 2px rgba(15,18,34,.05);
  --shadow:0 1px 2px rgba(15,18,34,.04),0 8px 24px -8px rgba(15,18,34,.10);
  --shadow-lg:0 20px 50px -12px rgba(91,77,255,.28);
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Consolas,monospace;
  --header-bg:rgba(255,255,255,.75);
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0a0b14;--bg-soft:#11131f;--surface:#12141f;--surface-2:#161927;
  --text:#eceefb;--muted:#9097b5;--border:#23263a;--border-strong:#2f3350;
  --primary:#7c6cff;--primary-2:#a78bfa;--ok:#34d399;--err:#f87171;--ok-bg:rgba(52,211,153,.10);--err-bg:rgba(248,113,113,.10);
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px -8px rgba(0,0,0,.5);
  --shadow-lg:0 20px 50px -12px rgba(124,108,255,.35);
  --grad-soft:linear-gradient(135deg,rgba(124,108,255,.16),rgba(217,70,239,.10));
  --header-bg:rgba(10,11,20,.72);
}}
:root[data-theme="dark"]{
  --bg:#0a0b14;--bg-soft:#11131f;--surface:#12141f;--surface-2:#161927;
  --text:#eceefb;--muted:#9097b5;--border:#23263a;--border-strong:#2f3350;
  --primary:#7c6cff;--primary-2:#a78bfa;--ok:#34d399;--err:#f87171;--ok-bg:rgba(52,211,153,.10);--err-bg:rgba(248,113,113,.10);
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px -8px rgba(0,0,0,.5);
  --shadow-lg:0 20px 50px -12px rgba(124,108,255,.35);
  --grad-soft:linear-gradient(135deg,rgba(124,108,255,.16),rgba(217,70,239,.10));
  --header-bg:rgba(10,11,20,.72);
}

/* ============ Base ============ */
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 Inter,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;font-feature-settings:"cv11","ss01";
  background-image:radial-gradient(900px 420px at 85% -120px,rgba(139,92,246,.12),transparent 70%),radial-gradient(700px 380px at -10% 0,rgba(6,182,212,.08),transparent 70%);
  background-repeat:no-repeat}
::selection{background:rgba(124,108,255,.28)}
a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:3px}
code{font-family:var(--mono);font-size:.88em;background:var(--bg-soft);border:1px solid var(--border);border-radius:6px;padding:1px 6px}
.container{max-width:1180px;margin:0 auto;padding:0 16px}

/* ============ Header ============ */
.site-header{position:sticky;top:0;z-index:50;background:var(--header-bg);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--border)}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:64px;gap:12px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:-.02em;color:var(--text)}
.logo:hover{text-decoration:none}
.logo .mark{width:32px;height:32px;border-radius:9px;background:var(--grad);display:grid;place-items:center;box-shadow:0 6px 16px -6px rgba(91,77,255,.7)}
.logo .mark svg{width:18px;height:18px}
.logo b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav{display:flex;gap:4px;align-items:center}
.nav a{color:var(--muted);font-size:14.5px;font-weight:500;padding:8px 12px;border-radius:8px}
.nav a:hover{color:var(--text);background:var(--bg-soft);text-decoration:none}
.nav a.active{color:var(--text);background:var(--bg-soft)}
.theme-btn{margin-left:6px;width:38px;height:38px;display:grid;place-items:center;background:var(--surface);border:1px solid var(--border);color:var(--text);border-radius:10px;cursor:pointer;transition:border-color .2s}
.theme-btn:hover{border-color:var(--primary)}
.theme-btn svg{width:18px;height:18px}
@media (max-width:720px){.nav a.hide-sm{display:none}}

/* ============ Layout ============ */
.page{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;padding:28px 0 56px}
@media (max-width:980px){.page{grid-template-columns:minmax(0,1fr)}.sidebar{display:none}}
main > .breadcrumb + h1{margin-top:14px}
h1{font-size:clamp(28px,4.2vw,40px);line-height:1.15;letter-spacing:-.03em;font-weight:800;margin:8px 0 8px}
h2,h3{letter-spacing:-.015em}
.lead{color:var(--muted);font-size:17px;margin:0 0 22px;max-width:62ch}
.breadcrumb{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:500;color:var(--muted);background:var(--surface);border:1px solid var(--border);border-radius:999px;padding:4px 12px}
.breadcrumb a{color:var(--muted)}.breadcrumb a:hover{color:var(--primary)}

.card{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.card + .card{margin-top:20px}
main > section.card:first-of-type{border-top:0}
main > section.card:first-of-type::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;border-radius:var(--radius) var(--radius) 0 0;background:var(--grad)}

/* ============ Homepage ============ */
.hero{position:relative;text-align:center;padding:72px 0 36px}
.hero .pill{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--primary);background:var(--grad-soft);border:1px solid rgba(124,108,255,.25);padding:6px 14px;border-radius:999px}
.hero .pill i{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 3px rgba(14,159,110,.2)}
.hero h1{font-size:clamp(36px,6.4vw,64px);margin:18px auto 14px;max-width:16ch}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{margin:0 auto;font-size:clamp(16px,2vw,19px)}
.search-wrap{position:relative;max-width:560px;margin:30px auto 0}
.search-wrap svg{position:absolute;left:18px;top:50%;transform:translateY(-50%);width:20px;height:20px;color:var(--muted)}
.search{width:100%;height:58px;padding:0 20px 0 50px !important;font-size:17px !important;border-radius:14px !important;background:var(--surface) !important;box-shadow:var(--shadow-lg)}
.hero-stats{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 28px;margin-top:26px;color:var(--muted);font-size:14px;font-weight:500}
.hero-stats span{display:inline-flex;align-items:center;gap:7px}
.hero-stats svg{width:16px;height:16px;color:var(--ok)}
.chips{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin:8px 0 6px}
.chip{font:inherit;font-size:14px;font-weight:600;color:var(--muted);background:var(--surface);border:1px solid var(--border);padding:7px 16px;border-radius:999px;cursor:pointer;transition:all .2s}
.chip:hover{color:var(--text);border-color:var(--border-strong)}
.chip.on{color:#fff;background:var(--grad);border-color:transparent;box-shadow:0 6px 18px -8px rgba(91,77,255,.8)}

.cat-title{display:flex;align-items:center;gap:10px;margin:36px 0 2px;font-size:21px;letter-spacing:-.02em}
.cat-title small{font-size:13px;font-weight:600;color:var(--muted);background:var(--bg-soft);border:1px solid var(--border);padding:1px 9px;border-radius:999px}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;padding:16px 0 8px}
.tool-card{position:relative;display:flex;flex-direction:column;gap:6px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;color:var(--text);box-shadow:var(--shadow-sm);transition:transform .25s cubic-bezier(.2,.8,.2,1),box-shadow .25s,border-color .25s;overflow:hidden}
.tool-card::after{content:"";position:absolute;inset:0;background:var(--grad-soft);opacity:0;transition:opacity .25s}
.tool-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:rgba(124,108,255,.45);text-decoration:none}
.tool-card:hover::after{opacity:1}
.tool-card > *{position:relative;z-index:1}
.tool-card .ic{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;font-size:20px;font-weight:800;color:#fff;margin-bottom:6px;box-shadow:0 8px 18px -8px rgba(15,18,34,.45)}
.ic.Finance{background:linear-gradient(135deg,#10b981,#059669)}
.ic.Developer{background:linear-gradient(135deg,#6366f1,#8b5cf6)}
.ic.Converters{background:linear-gradient(135deg,#06b6d4,#3b82f6)}
.ic.Everyday{background:linear-gradient(135deg,#f59e0b,#ef4444)}
.tool-card h3{margin:0;font-size:16.5px;font-weight:700}
.tool-card p{margin:0;color:var(--muted);font-size:14px;line-height:1.5}
.tool-card .go{margin-top:auto;padding-top:10px;font-size:13.5px;font-weight:600;color:var(--primary);display:flex;align-items:center;gap:6px}
.tool-card .go svg{width:14px;height:14px;transition:transform .25s}
.tool-card:hover .go svg{transform:translateX(4px)}
.tool-card .badge{position:absolute;top:16px;right:16px;font-size:11px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:#b45309;background:#fef3c7;padding:2px 8px;border-radius:999px}

.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:48px 0 0}
.feature{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px}
.feature .fi{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;background:var(--grad-soft);color:var(--primary);margin-bottom:12px}
.feature .fi svg{width:20px;height:20px}
.feature h3{margin:0 0 4px;font-size:16px}.feature p{margin:0;color:var(--muted);font-size:14.5px}

/* ============ Forms ============ */
label{display:block;font-weight:600;font-size:13.5px;margin:0 0 7px;color:var(--text)}
input,select,textarea{width:100%;font:inherit;font-size:15.5px;color:var(--text);background:var(--surface-2);border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:11px 14px;transition:border-color .15s,box-shadow .15s}
input:hover,select:hover,textarea:hover{border-color:var(--muted)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 4px rgba(124,108,255,.18)}
select{appearance:none;-webkit-appearance:none;padding-right:38px;cursor:pointer;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238b90a8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 14px center}
textarea{font-family:var(--mono);font-size:13.5px;line-height:1.6;min-height:280px;resize:vertical}
input[type=checkbox]{width:18px !important;height:18px;accent-color:var(--primary);vertical-align:-3px;margin-right:4px;padding:0}
input[type=range]{padding:0;border:0;background:transparent;accent-color:var(--primary);height:28px;box-shadow:none}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin-bottom:16px}
.btns{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:16px 0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--grad);background-size:140% 140%;color:var(--primary-ink);border:0;border-radius:var(--radius-sm);padding:11px 20px;font:inherit;font-size:15px;font-weight:600;cursor:pointer;box-shadow:0 8px 20px -10px rgba(91,77,255,.9),inset 0 1px 0 rgba(255,255,255,.2);transition:transform .15s,box-shadow .2s,background-position .4s}
.btn:hover{transform:translateY(-1px);background-position:100% 0;box-shadow:0 12px 26px -10px rgba(91,77,255,.9)}
.btn:active{transform:translateY(0)}
.btn.secondary{background:var(--surface);color:var(--text);border:1px solid var(--border-strong);box-shadow:var(--shadow-sm)}
.btn.secondary:hover{border-color:var(--primary);color:var(--primary)}
.msg{display:flex;gap:8px;border-radius:var(--radius-sm);padding:12px 16px;margin-top:14px;font-size:15px;font-weight:500;white-space:pre-wrap;word-break:break-word;border:1px solid transparent}
.msg.ok{background:var(--ok-bg);color:var(--ok);border-color:rgba(14,159,110,.25)}
.msg.err{background:var(--err-bg);color:var(--err);border-color:rgba(224,36,36,.25)}
.msg:empty{display:none}

/* ============ Results ============ */
.results{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px;margin-top:20px}
.stat{background:var(--surface-2);border:1px solid var(--border);border-radius:14px;padding:16px 18px}
.stat .k{font-size:12.5px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.stat .v{font-size:24px;font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums;margin-top:2px;word-break:break-word}
.results .stat:first-child{background:var(--grad);border-color:transparent;color:#fff;box-shadow:var(--shadow-lg)}
.results .stat:first-child .k{color:rgba(255,255,255,.82)}
.results .stat:first-child .v{color:#fff !important}
.bar{display:flex;height:12px;border-radius:999px;overflow:hidden;margin-top:20px;background:var(--bg-soft)}
.bar .a{background:linear-gradient(90deg,#5b4dff,#8b5cf6);transition:width .4s}
.bar .b{background:linear-gradient(90deg,#f59e0b,#f97316);transition:width .4s}
.legend{display:flex;gap:18px;font-size:13px;color:var(--muted);margin-top:8px}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:middle}
table{width:100%;border-collapse:collapse;font-size:14px;font-variant-numeric:tabular-nums}
th,td{text-align:right;padding:10px 12px;border-bottom:1px solid var(--border)}
th:first-child,td:first-child{text-align:left}
tbody tr:hover td{background:var(--bg-soft)}
.table-wrap{max-height:380px;overflow:auto;margin-top:20px;border:1px solid var(--border);border-radius:12px}
.table-wrap tr:last-child td{border-bottom:0}
thead th{position:sticky;top:0;background:var(--surface-2);font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-weight:700}
pre{border-radius:12px !important}

/* ============ Article ============ */
.article h2{font-size:23px;margin:0 0 10px}.article h3{font-size:17px;margin:22px 0 6px}
.article p,.article li{color:var(--text);opacity:.92}
.article ul{padding-left:20px}.article li{margin:4px 0}
.article li::marker{color:var(--primary)}
.article table{margin:10px 0 14px;border:1px solid var(--border);border-radius:10px;overflow:hidden}
.related{display:flex;flex-wrap:wrap;gap:8px}
.related a{font-size:14px;font-weight:500;color:var(--text);background:var(--surface-2);border:1px solid var(--border);padding:6px 14px;border-radius:999px;transition:all .2s}
.related a:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}

/* ============ Sidebar ============ */
.sidebar{display:flex;flex-direction:column;gap:20px}
.side-card{position:sticky;top:88px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}
.side-card h4{margin:0 0 10px;font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.side-card a{display:flex;align-items:center;gap:10px;padding:8px;margin:0 -8px;border-radius:10px;color:var(--text);font-size:14.5px;font-weight:500}
.side-card a:hover{background:var(--bg-soft);text-decoration:none}
.side-card a.cur{background:var(--grad-soft);color:var(--primary)}
.side-card .ic{width:30px;height:30px;flex:none;border-radius:8px;display:grid;place-items:center;font-size:13px;font-weight:800;color:#fff}

/* ============ Ads ============ */
.ad-slot{margin:22px 0;min-height:100px;text-align:center}
.ad-slot::before{content:"Advertisement";display:block;font-size:10.5px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase;margin-bottom:6px}
.sidebar .ad-slot{min-height:600px;margin:0}

/* ============ Footer ============ */
.site-footer{margin-top:24px;border-top:1px solid var(--border);background:var(--surface);color:var(--muted);font-size:14px}
.site-footer .cols{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:28px;padding:44px 16px 28px}
@media (max-width:760px){.site-footer .cols{grid-template-columns:1fr 1fr}.site-footer .brand{grid-column:1/-1}}
.site-footer h5{margin:0 0 12px;font-size:12.5px;text-transform:uppercase;letter-spacing:.07em;color:var(--text)}
.site-footer a{display:block;color:var(--muted);padding:3px 0}
.site-footer a:hover{color:var(--primary);text-decoration:none}
.site-footer .brand p{margin:12px 0 0;max-width:34ch;line-height:1.6}
.site-footer .bottom{border-top:1px solid var(--border);padding:18px 16px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;font-size:13px}

/* motion preference */
@media (prefers-reduced-motion:reduce){*{transition:none !important;scroll-behavior:auto !important}}