:root {
    --bg: #0f1115;
    --card: #171a21;
    --card2: #1e222b;
    --line: #2a2f3a;
    --text: #e7eaf0;
    --muted: #9aa3b2;
    --brand: #4f8cff;
    --brand2: #6ea0ff;
    --ok: #33cc88;
    --err: #ff5b6a;
    --radius: 14px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: radial-gradient(1200px 600px at 50% -10%, #1b2233 0%, var(--bg) 55%);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

.wrap {
    max-width: 520px;
    margin: 0 auto;
    padding: 28px 16px 48px;
}

.hero { text-align: center; margin-bottom: 22px; }
.hero .logo { font-size: 44px; }
.hero h1 { margin: 6px 0 2px; font-size: 26px; letter-spacing: .5px; }
.subtitle { color: var(--muted); margin: 0; font-size: 14px; }

.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: 0 20px 50px rgba(0,0,0,.35);
}

.tabs { display: flex; gap: 8px; margin-bottom: 18px; background: var(--card2); padding: 4px; border-radius: 12px; }
.tab {
    flex: 1; padding: 10px; border: none; border-radius: 9px;
    background: transparent; color: var(--muted); font-size: 15px; cursor: pointer;
    transition: .2s;
}
.tab.active { background: var(--brand); color: #fff; }

.panel { display: none; }
.panel.active { display: block; }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 14px; margin-bottom: 7px; color: var(--muted); }
.field small { display: block; margin-top: 6px; color: var(--muted); font-size: 12px; }

input[type=text] {
    width: 100%; padding: 13px 14px; border-radius: 10px;
    border: 1px solid var(--line); background: var(--card2); color: var(--text);
    font-size: 15px; outline: none; transition: border .2s;
}
input[type=text]:focus { border-color: var(--brand); }

.udid-row { display: flex; gap: 8px; }
.udid-row input { flex: 1; }

.btn-ghost {
    white-space: nowrap; display: inline-flex; align-items: center;
    padding: 0 14px; border-radius: 10px; border: 1px solid var(--brand);
    color: var(--brand2); text-decoration: none; font-size: 14px;
}
.btn-ghost:active { transform: scale(.98); }

.agree { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 13px; margin: 6px 0 16px; }
.agree input { width: 16px; height: 16px; }

.btn-primary {
    width: 100%; padding: 14px; border: none; border-radius: 11px;
    background: linear-gradient(135deg, var(--brand), var(--brand2));
    color: #fff; font-size: 16px; font-weight: 600; cursor: pointer;
    transition: .15s;
}
.btn-primary:active { transform: scale(.99); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; }

.result {
    margin-top: 18px; padding: 16px; border-radius: 12px;
    background: var(--card2); border: 1px solid var(--line); font-size: 14px;
}
.result.ok { border-color: rgba(51,204,136,.4); }
.result.err { border-color: rgba(255,91,106,.4); color: #ffb3ba; }
.result .row { display: flex; justify-content: space-between; gap: 10px; padding: 6px 0; border-bottom: 1px dashed var(--line); }
.result .row:last-child { border-bottom: none; }
.result .k { color: var(--muted); }
.result .v { text-align: right; word-break: break-all; }
.result code { background: #0d0f14; padding: 2px 7px; border-radius: 6px; color: #ffd479; }

.pwd-box {
    display: flex; align-items: center; gap: 10px; margin-top: 14px;
    padding: 12px 14px; border-radius: 10px;
    background: rgba(79,140,255,.12); border: 1px solid rgba(79,140,255,.35);
    color: var(--muted); font-size: 14px;
}
.pwd-box b {
    flex: 1; color: #ffd479; font-size: 22px; font-weight: 700;
    letter-spacing: 2px; font-family: ui-monospace, Menlo, Consolas, monospace;
}
.copy-btn {
    padding: 7px 14px; border-radius: 8px; border: 1px solid var(--brand);
    background: transparent; color: var(--brand2); font-size: 13px; cursor: pointer;
}
.copy-btn:active { transform: scale(.97); }
.result .hint { color: var(--muted); font-size: 12px; margin: 10px 0 0; }

.dl-btns { display: flex; gap: 10px; margin-top: 14px; }
.dl-btns a {
    flex: 1; text-align: center; padding: 12px; border-radius: 10px;
    text-decoration: none; font-weight: 600; color: #fff;
    background: linear-gradient(135deg, #2fa36b, var(--ok));
}
.dl-btns a.alt { background: linear-gradient(135deg, #5566e6, #7d8cff); }

.spinner {
    display: inline-block; width: 16px; height: 16px; border: 2px solid rgba(255,255,255,.4);
    border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite; vertical-align: -3px; margin-right: 8px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.help { margin-top: 26px; color: var(--muted); font-size: 14px; }
.help h3 { color: var(--text); font-size: 16px; margin: 18px 0 8px; }
.help ol, .help ul { margin: 0; padding-left: 20px; }
.help li { margin: 5px 0; }
.help .contact { margin-top: 16px; padding: 12px; background: var(--card); border: 1px solid var(--line); border-radius: 10px; }

footer { text-align: center; color: var(--muted); font-size: 12px; margin-top: 30px; }