:root {
    --brand-navy: #10243f;
    --brand-navy-deep: #0b1a2e;
    --brand-gold: #c4a35a;
    --brand-gold-hover: #b08d3f;
    --surface: #ffffff;
    --muted: #5c6b7a;
    --line: #e4e8ee;
    --danger: #c0392b;
    --page-bg: #f3f5f8;
}

html,
body {
    min-height: 100%;
}

body.app-body {
    background:
        radial-gradient(1200px 420px at 10% -10%, rgba(196, 163, 90, 0.18), transparent 50%),
        radial-gradient(900px 380px at 100% 0%, rgba(16, 36, 63, 0.12), transparent 46%),
        var(--page-bg);
    color: var(--brand-navy);
    font-family: "Noto Sans TC", "Segoe UI", sans-serif;
}

.app-header {
    background: var(--brand-navy);
    color: #fff;
}

.app-logo {
    display: block;
    width: 3rem;
    height: 3rem;
    flex-shrink: 0;
}

.app-header .app-logo {
    width: 2.25rem;
    height: 2.25rem;
}

.app-brand {
    letter-spacing: 0.08em;
    font-weight: 700;
}

.app-brand-sub {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.8rem;
}

.app-shell {
    min-height: calc(100vh - 132px);
}

.app-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 1rem;
    box-shadow: 0 16px 40px rgba(16, 36, 63, 0.08);
}

.app-step {
    width: 1.75rem;
    height: 1.75rem;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
    background: var(--brand-navy);
    color: #fff;
}

.app-kicker {
    color: var(--brand-gold);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.12em;
}

.btn-brand {
    --bs-btn-bg: var(--brand-navy);
    --bs-btn-border-color: var(--brand-navy);
    --bs-btn-hover-bg: var(--brand-navy-deep);
    --bs-btn-hover-border-color: var(--brand-navy-deep);
    --bs-btn-color: #fff;
    --bs-btn-hover-color: #fff;
    --bs-btn-active-bg: var(--brand-navy-deep);
    --bs-btn-active-border-color: var(--brand-navy-deep);
    --bs-btn-active-color: #fff;
}

.btn-gold {
    --bs-btn-bg: var(--brand-gold);
    --bs-btn-border-color: var(--brand-gold);
    --bs-btn-hover-bg: var(--brand-gold-hover);
    --bs-btn-hover-border-color: var(--brand-gold-hover);
    --bs-btn-color: #1a1406;
    --bs-btn-hover-color: #1a1406;
    --bs-btn-active-bg: var(--brand-gold-hover);
    --bs-btn-active-border-color: var(--brand-gold-hover);
    --bs-btn-active-color: #1a1406;
    font-weight: 700;
}

.form-control:focus {
    border-color: var(--brand-gold);
    box-shadow: 0 0 0 0.2rem rgba(196, 163, 90, 0.2);
}

.required-mark {
    color: var(--danger);
}

.result-row {
    border-bottom: 1px solid var(--line);
}

.result-row:last-child {
    border-bottom: 0;
}

.app-footer {
    color: var(--muted);
    font-size: 0.8rem;
}

@media (max-width: 575.98px) {
    .app-shell {
        min-height: calc(100vh - 148px);
        padding-top: 1.25rem !important;
        padding-bottom: 1.25rem !important;
    }

    .app-card {
        border-radius: 0.85rem;
        box-shadow: 0 8px 24px rgba(16, 36, 63, 0.06);
    }

    .btn-lg {
        padding-top: 0.8rem;
        padding-bottom: 0.8rem;
    }
}