:root { color-scheme: light; font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: #f5f8ff; color: #1e293b; }
.page { max-width: 1180px; margin: 0 auto; padding: 18px; }
.topbar { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px; align-items: center; padding: 18px 0; }
.brand { display: flex; flex-direction: column; gap: 8px; }
.brand h1 { margin: 0; font-size: clamp(2rem, 3vw, 2.7rem); letter-spacing: .02em; }
.brand p { margin: 0; color: #475569; max-width: 720px; line-height: 1.75; }
.theme-switch { display: flex; gap: 10px; }
.view-button, .tool-button { border: 1px solid #cbd5e1; border-radius: 999px; padding: 11px 18px; background: #fff; cursor: pointer; color: #475569; transition: background .2s, border-color .2s; }
.view-button.active, .tool-button.active { border-color: #6366f1; background: #eef2ff; color: #3730a3; }
.grid { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 18px; }
.sidebar { background: #fff; border-radius: 18px; padding: 18px; box-shadow: 0 18px 48px rgba(15, 23, 42, .06); }
.sidebar h2 { margin: 0 0 12px; font-size: 1rem; color: #334155; }
.content { background: #fff; border-radius: 24px; padding: 24px; box-shadow: 0 18px 48px rgba(15, 23, 42, .06); }
.panel { display: none; }
.panel.active { display: block; }
.tool-grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); margin-top: 18px; }
.card { display: block; padding: 18px; border-radius: 20px; border: 1px solid #e2e8f0; background: #fff; color: #0f172a; text-decoration: none; transition: transform .2s, box-shadow .2s; }
.card:hover { transform: translateY(-2px); box-shadow: 0 18px 48px rgba(15, 23, 42, .06); }
.card.disabled { cursor: not-allowed; opacity: .65; background: #f8fafc; }
.card h3 { margin: 0 0 10px; font-size: 1.15rem; }
.card p { margin: 0; color: #64748b; line-height: 1.6; }
.hint { margin-top: 20px; color: #64748b; font-size: .95rem; }
.preview.mobile .page { max-width: 420px; margin: 0 auto; border-left: 1px solid #e2e8f0; border-right: 1px solid #e2e8f0; }
.preview.mobile .sidebar { display: none; }
.preview.mobile .content { border-radius: 0; box-shadow: none; }
.preview.mobile .topbar { flex-direction: column; align-items: flex-start; }
.preview.mobile .grid { display: block; }
.preview.mobile .button, .preview.mobile .view-button { width: 100%; }
.preview.mobile .tool-button { border-radius: 0; }
@media (max-width: 860px) { .grid { grid-template-columns: 1fr; } .sidebar { order: 2; } .content { order: 1; } }
@media (max-width: 620px) { .page { padding: 14px; } .topbar { gap: 10px; } .tool-grid { grid-template-columns: 1fr; } }
.mortgage-topbar { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px; align-items: center; padding-bottom: 18px; }
.mortgage-panel { max-width: 760px; margin: 0 auto; }
.mortgage-tab { display: flex; gap: 8px; border-radius: 16px; background: #eef2ff; overflow: hidden; margin-bottom: 18px; }
.mortgage-tab button { flex: 1; border: none; background: #f8fafc; color: #475569; padding: 12px 0; cursor: pointer; font-size: 0.95rem; transition: background .2s, color .2s; }
.mortgage-tab button.active { background: #6366f1; color: #fff; }
.mortgage-form { display: grid; gap: 16px; }
.mortgage-form label { display: block; color: #475569; font-size: .95rem; margin-bottom: 8px; }
.mortgage-form input, .mortgage-form select { width: 100%; padding: 14px 16px; border-radius: 14px; border: 1px solid #cbd5e1; background: #f8fafc; color: #0f172a; font-size: 1rem; }
.mortgage-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
.mortgage-actions button { border: none; border-radius: 999px; padding: 14px 20px; background: #6366f1; color: #fff; cursor: pointer; transition: transform .2s, opacity .2s; }
.mortgage-actions button.secondary { background: #475569; }
.mortgage-result { margin-top: 24px; padding: 18px; background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 18px; }
.mortgage-result .result-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.mortgage-result .result-item { padding: 14px 16px; background: #fff; border-radius: 16px; border: 1px solid #e2e8f0; }
.mortgage-result .label { display: block; font-size: .85rem; color: #64748b; margin-bottom: 10px; }
.mortgage-result .value { font-size: 1.15rem; font-weight: 700; color: #0f172a; }
.mortgage-warning { color: #f43f5e; margin-top: 12px; }
.loan-type-buttons { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.loan-type-buttons button { border: 1px solid #cbd5e1; border-radius: 14px; padding: 12px 16px; background: #f8fafc; color: #475569; cursor: pointer; transition: background .2s, border-color .2s, color .2s; flex: 1; }
.loan-type-buttons button.active { background: #6366f1; border-color: #6366f1; color: #fff; }
.form-row { display: grid; gap: 16px; }
.form-row label { display: block; color: #475569; font-size: .95rem; margin-bottom: 8px; }
.form-row input, .form-row select { width: 100%; padding: 14px 16px; border-radius: 14px; border: 1px solid #cbd5e1; background: #f8fafc; color: #0f172a; font-size: 1rem; }
.form-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
.form-actions button { border: none; border-radius: 999px; padding: 14px 20px; background: #6366f1; color: #fff; cursor: pointer; transition: transform .2s, opacity .2s; }
.form-actions button.secondary { background: #475569; }
.result-card { margin-top: 24px; padding: 18px; background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 18px; }
.result-card .result-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.result-card .result-item { padding: 14px 16px; background: #fff; border-radius: 16px; border: 1px solid #e2e8f0; }
.result-card .result-label { display: block; font-size: .85rem; color: #64748b; margin-bottom: 10px; }
.result-card .result-value { font-size: 1.15rem; font-weight: 700; color: #0f172a; }
.result-card .result-total { font-weight: 900; color: #111827; }
.result-card .result-note { margin-top: 14px; color: #64748b; font-size: .92rem; line-height: 1.6; }