/* ZeroFee Tools family theme - Number Base Converter */
* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --blue: #1d4ed8; --purple: #7c3aed; --ink: #1e293b; --muted: #64748b;
  --line: #e2e8f0; --bg: #f8fafc; --card: #ffffff; --ok: #16a34a;
  --warn: #d97706; --bad: #dc2626;
}
body { font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--ink); line-height: 1.6; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); } .small { font-size: .85rem; } .center { text-align: center; }

/* header */
#siteHeader { background: linear-gradient(135deg, var(--blue), var(--purple)); color: #fff; padding: 26px 0 0; }
.header-inner { display: flex; align-items: center; }
.brand { display: flex; gap: 14px; align-items: center; }
.hub-link { color: #fff; text-decoration: none; font-size: .85rem; opacity: .85; display: block; margin-bottom: 2px; }
.hub-link:hover { opacity: 1; text-decoration: underline; }
.brand-name { font-size: 1.7rem; line-height: 1.1; }
.brand-tag { opacity: .9; font-size: .9rem; }
.free-banner { text-align: center; font-size: .82rem; padding: 10px 16px 14px; opacity: .95; }

/* layout */
#main { padding: 30px 0 10px; }

/* mode tabs */
.sw-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 22px; }
.sw-tab { border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 9px 18px; font-size: .95rem; cursor: pointer; color: var(--ink); }
.sw-tab.active { background: var(--blue); border-color: var(--blue); color: #fff; font-weight: 600; }

/* converter layout */
.conv-grid { display: grid; grid-template-columns: 380px 1fr; gap: 22px; align-items: start; margin-bottom: 22px; }
@media (max-width: 900px) { .conv-grid { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.card h2 { margin-bottom: 8px; font-size: 1.25rem; }

label { display: block; font-size: .9rem; font-weight: 600; margin-bottom: 14px; }
input[type="text"], input[type="number"], textarea, select {
  display: block; width: 100%; margin-top: 6px; padding: 10px 12px; font-size: .95rem;
  border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--ink); font-weight: 400;
}
input[type="text"]#cvValue, textarea { font-family: ui-monospace, Menlo, Consolas, monospace; }
textarea { resize: vertical; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--blue); border-color: var(--blue); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 520px) { .grid2 { grid-template-columns: 1fr; } }

.conv-error { color: var(--bad); font-size: .88rem; font-weight: 600; margin: 4px 0 10px; }

/* outputs */
.outputs { display: grid; gap: 14px; }
.out-card { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; }
.out-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 8px; font-weight: 700; font-size: .92rem; }
.out-val { display: block; font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 1.15rem; word-break: break-all; line-height: 1.5; color: var(--ink); }
.out-pre { white-space: pre-wrap; font-size: .95rem; max-height: 220px; overflow-y: auto; }
.copy-btn { border: 1px solid var(--line); background: #eef2ff; color: var(--blue); border-radius: 8px; padding: 6px 14px; font-size: .82rem; font-weight: 700; cursor: pointer; white-space: nowrap; }
.copy-btn:hover { background: #e0e7ff; }
.base-mini { display: inline-block !important; width: 74px !important; margin: 0 0 0 6px !important; padding: 5px 8px !important; font-size: .9rem !important; }

/* direction segmented control */
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; margin-bottom: 16px; background: #f8fafc; }
.seg-btn { border: none; background: transparent; padding: 9px 18px; font-size: .9rem; cursor: pointer; color: var(--ink); }
.seg-btn.active { background: var(--blue); color: #fff; font-weight: 600; }

/* reference table */
.ref-card { margin-bottom: 8px; }
.table-scroll { max-height: 440px; overflow: auto; border: 1px solid var(--line); border-radius: 10px; margin-top: 12px; }
.ref-table { width: 100%; border-collapse: collapse; font-size: .88rem; }
.ref-table th, .ref-table td { padding: 7px 12px; text-align: left; border-bottom: 1px solid var(--line); }
.ref-table thead th { position: sticky; top: 0; background: #eef2ff; color: #3730a3; font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; z-index: 1; }
.ref-table tbody tr:nth-child(even) { background: #f8fafc; }
.ref-table .mono { font-family: ui-monospace, Menlo, Consolas, monospace; }

/* faq */
.faq-sec { margin: 34px 0 40px; }
.faq-sec h2 { margin-bottom: 14px; font-size: 1.3rem; }
.faq { background: #fff; border: 1px solid var(--line); border-radius: 12px; margin-bottom: 10px; }
.faq summary { padding: 14px 18px; font-weight: 600; cursor: pointer; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "+ "; color: var(--blue); font-weight: 700; }
.faq[open] summary::before { content: "− "; }
.faq p { padding: 0 18px 16px; color: #475569; }

.toast { position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%) translateY(20px); background: #1e293b; color: #fff; padding: 12px 20px; border-radius: 12px; font-size: .9rem; opacity: 0; pointer-events: none; transition: .25s; z-index: 50; max-width: 90vw; text-align: center; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }