#zc-app {
    --navy: #0f2439;
    --navy-2: #16324a;
    --teal: #0d9488;
    --teal-dark: #0b7a70;
    --teal-light: #ccfbf1;
    --bg: #f4f8f8;
    --card: #ffffff;
    --border: #d8e6e4;
    --text: #14262f;
    --text-muted: #4d6470;
    max-width: 980px;
    margin: 0 auto;
    padding: 24px 16px 48px;
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
}

#zc-app * { box-sizing: border-box; }

.zc-header h2 {
    color: var(--navy);
    margin: 0 0 4px;
    font-size: 28px;
}
.zc-header p {
    color: var(--text-muted);
    margin: 0 0 20px;
}

.zc-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    border-bottom: 2px solid var(--border);
    margin-bottom: 20px;
}
.zc-tab {
    background: transparent;
    border: none;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
}
.zc-tab:hover { color: var(--teal-dark); }
.zc-tab.active {
    color: var(--navy);
    border-bottom-color: var(--teal);
}

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

.zc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    margin-bottom: 16px;
}

.zc-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 18px;
}
.zc-card.zc-full { grid-column: 1 / -1; }

.zc-card h3 {
    color: var(--navy);
    margin: 0 0 12px;
    font-size: 16px;
}

#zc-app label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    margin: 10px 0 4px;
}

#zc-app input[type=number],
#zc-app input[type=text],
#zc-app select {
    width: 100%;
    padding: 9px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    color: var(--text);
    background: #fff;
}
#zc-app input:focus,
#zc-app select:focus {
    outline: none;
    border-color: var(--teal);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.zc-btn {
    margin-top: 16px;
    width: 100%;
    background: var(--teal);
    color: #fff;
    border: none;
    padding: 11px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
}
.zc-btn:hover { background: var(--teal-dark); }

.zc-btn-sm {
    background: var(--navy);
    color: #fff;
    border: none;
    padding: 7px 12px;
    border-radius: 5px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
}
.zc-btn-sm:hover { background: var(--navy-2); }
.zc-btn-danger { background: #7a1f2b; }
.zc-btn-danger:hover { background: #5c1620; }

.zc-result { background: var(--teal-light); border-color: var(--teal); }

.zc-big {
    font-size: 36px;
    font-weight: 800;
    color: var(--navy);
    margin-bottom: 12px;
}

.zc-table-out { width: 100%; border-collapse: collapse; font-size: 14px; }
.zc-table-out td { padding: 6px 4px; border-bottom: 1px solid rgba(15,36,57,0.1); color: var(--text); }
.zc-table-out td:first-child { color: var(--text-muted); font-weight: 600; }
.zc-table-out td:last-child { text-align: right; font-weight: 700; color: var(--navy); }

.zc-curve { margin-top: 14px; background: #fff; border-radius: 8px; padding: 8px; border: 1px solid var(--border); }
.zc-curve canvas { width: 100%; height: auto; display: block; }

.zc-result-export { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }

.zc-radio-row { display: flex; gap: 24px; flex-wrap: wrap; }
.zc-radio-row label { display: flex; align-items: center; gap: 6px; font-weight: 600; color: var(--text); }
.zc-radio-row input { width: auto; margin: 0; }

.zc-two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }

.zc-verdict {
    margin-top: 14px;
    padding: 12px 14px;
    border-radius: 8px;
    font-weight: 700;
    background: var(--navy);
    color: #fff;
}

.zc-hint { font-size: 13px; color: var(--text-muted); margin: -4px 0 12px; }

.zc-table-scroll { overflow-x: auto; }

.zc-ztable { border-collapse: collapse; width: 100%; font-size: 12px; }
.zc-ztable th, .zc-ztable td {
    border: 1px solid var(--border);
    padding: 5px 6px;
    text-align: center;
    white-space: nowrap;
    color: var(--text);
}
.zc-ztable th { background: var(--navy); color: #fff; }
.zc-ztable td.zc-row-head { background: var(--navy); color: #fff; font-weight: 700; }
.zc-ztable td.zc-hit { background: var(--teal); color: #fff; font-weight: 700; }
.zc-ztable td.zc-hit-row, .zc-ztable td.zc-hit-col { background: var(--teal-light); color: var(--text); }

.zc-history-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 12px;
}
.zc-history-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.zc-history-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.zc-history-table th {
    background: var(--navy);
    color: #fff;
    text-align: left;
    padding: 8px 10px;
}
.zc-history-table td {
    padding: 8px 10px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}
.zc-history-table tr:nth-child(even) { background: #f6fbfa; }

.zc-empty { color: var(--text-muted); font-size: 13px; text-align: center; padding: 16px 0; }

.zc-disclaimer {
    text-align: center;
    color: var(--text-muted);
    font-size: 12px;
    margin-top: 24px;
}

@media (max-width: 600px) {
    .zc-two-col { grid-template-columns: 1fr; }
    .zc-big { font-size: 28px; }
}