:root{
  --bg:#ffffff; --card:#ffffff; --text:#0b0b0f; --muted:#6b7280; --brand:#3f97fb;
  --border:#e5e7eb; --ok:#16a34a;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.5 Inter,system-ui,Segoe UI,Roboto,Arial,sans-serif}
code{background:#f0f3f8;border-radius:6px;padding:.1rem .35rem}
.container{max-width:960px;margin:0 auto;padding:0 16px}
.header{display:flex;align-items:center;justify-content:space-between;padding:18px 16px}
.brand{display:flex;align-items:center;gap:8px;font-weight:700}
.brand .logo{font-size:20px}
.brand-logo{height:28px;width:auto;display:inline-block;border-radius:6px}
.brand .title{font-size:18px}
.nav a{color:var(--muted);text-decoration:none;margin-left:16px}
.lang-switch{position:relative;margin-left:12px}
.lang-btn{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--border);background:#fff;border-radius:12px;padding:8px 10px;color:var(--text);cursor:pointer}
.lang-flag{font-size:16px;line-height:1}
.lang-menu{position:absolute;right:0;top:120%;min-width:180px;background:#fff;border:1px solid var(--border);border-radius:12px;box-shadow:0 8px 24px rgba(15,23,42,0.12);padding:6px 4px;display:none;z-index:30}
.lang-menu.open{display:block}
.lang-menu a{display:flex;align-items:center;gap:8px;padding:8px 10px;color:var(--text);text-decoration:none;border-radius:10px}
.lang-menu a:hover{background:#f3f4f6}
.nav a:hover{color:var(--text)}
.mode-bar{display:flex;justify-content:flex-end;padding:6px 0}
.mode-switch{display:inline-flex;align-items:center;gap:4px;border:1px solid var(--border);border-radius:12px;padding:2px;background:#fff}
.seg{display:inline-flex;align-items:center;gap:6px;padding:4px 8px;border-radius:8px;color:var(--muted);font-size:12px;cursor:pointer;transition:all .15s ease}
.seg input{appearance:none;-webkit-appearance:none;width:14px;height:14px;border:2px solid #9ca3af;border-radius:50%;display:inline-block;position:relative;background:#fff;transition:all .15s ease}
.seg input:checked{border-color:#111;background:radial-gradient(circle at 50% 50%, #111 0 45%, transparent 46% 100%)}
.seg.active input{border-color:#fff}
.seg.active input:checked{border-color:#fff;background:radial-gradient(circle at 50% 50%, #fff 0 45%, transparent 46% 100%)}
.seg.active{background:#111;border:1px solid #111}
.seg input:checked + span{color:#111;font-weight:700}
.seg.active input:checked + span{color:#fff}
.seg span{display:inline-block}
.main{padding:28px 16px}
.main h1{font-size:28px;margin:0 0 6px}
.subtitle{color:var(--muted);margin:0 0 18px}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:16px;box-shadow:0 1px 0 rgba(0,0,0,0.02)}
.card{background:#f6f7fb;border:none;border-radius:20px;box-shadow:0 12px 28px rgba(15,23,42,0.08)}
.label{display:block;margin:4px 0 8px;color:var(--text)}
.input-row{display:flex;flex-direction:column;align-items:center;gap:10px}
.input-row input{width:100%;max-width:480px;border:1px solid var(--border);border-radius:14px;padding:16px 16px;font-size:18px}
.button-row{display:flex;justify-content:center;margin-top:10px}
.button-row.left{justify-content:flex-start}
.btn{border:1px solid #111;border-radius:14px;padding:12px 18px;background:#111;color:#fff;cursor:pointer;font-weight:600}
.btn.primary{background:linear-gradient(90deg,#ff3b3b 0%,#3f5efb 100%);border-color:transparent;font-size:18px}
.btn.dark{background:#000;border-color:#000;color:#fff}
.btn .icon{width:18px;height:18px;margin-right:8px;display:inline-block;vertical-align:middle}
.btn.small{padding:8px 10px;font-size:12px;border-radius:10px}
.btn.secondary{background:#fff;color:#111}
.options{margin:10px 0 6px}
.checkbox{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:14px}
.result{margin-top:12px;padding:12px;border:1px solid var(--border);border-radius:12px;background:#fafbff}
.result .actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:4px;align-items:center;justify-content:center}
.a-btn{display:inline-flex;align-items:center;gap:6px;padding:10px 12px;border-radius:10px;text-decoration:none;border:1px solid var(--border);background:#fff}
.a-btn.ok{border-color:#16a34a;color:#166534}
.a-btn.copy-btn{border-color:var(--border);color:var(--text);background:#fff}
.a-btn.copy-btn:hover{background:#f3f4f6}
.toast{margin-top:10px;display:none;padding:8px 10px;border-radius:10px;background:#111;color:#fff;font-size:12px}
.toast.show{display:inline-block}
.country{margin-top:6px;color:var(--text);font-size:14px}

/* Spinner */
.spinner{width:26px;height:26px;border:3px solid #e5e7eb;border-top-color:var(--brand);border-radius:50%;animation:spin 0.9s linear infinite;margin:8px auto}
@keyframes spin{to{transform:rotate(360deg)}}
.spinner-text{margin-top:6px;text-align:center;color:var(--muted);font-size:14px}
.info{margin-top:22px}
.info h2{margin:10px 0 6px;font-size:18px}
.footer{padding:24px 16px;color:var(--muted)}
.hidden{display:none}
@media (max-width:520px){.input-row{flex-direction:column}.btn{width:100%}}