/* ======================================================================
 *  信用卡分期真实利率计算器 /tools/installment-rate
 *  依赖 home.css 全局变量 + tool-detail.css 公共类，支持黑夜模式
 * ====================================================================== */

[hidden] { display: none !important; }

.ir-layout {
    display: grid;
    grid-template-columns: 420px minmax(0, 1fr);
    gap: 20px;
    margin-bottom: 24px;
    align-items: start;
}
.ir-card {
    background: var(--c-bg-card);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 22px;
}
.ir-title {
    font-size: 16px;
    font-weight: 800;
    letter-spacing: -0.01em;
    margin-bottom: 16px;
}

/* ---------- 表单 ---------- */
.ir-field { margin-bottom: 14px; min-width: 0; }
.ir-field > label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    color: var(--c-text-sub);
    margin-bottom: 7px;
}
.ir-input-wrap { position: relative; display: flex; align-items: center; }
.ir-input {
    width: 100%;
    height: 43px;
    padding: 0 44px 0 14px;
    font-size: 14px;
    font-family: inherit;
    color: var(--c-text);
    background: var(--c-surface-soft);
    border: 1px solid var(--c-border);
    border-radius: 12px;
    outline: none;
    transition: border-color 0.16s ease, box-shadow 0.16s ease;
    -moz-appearance: textfield;
}
.ir-input::-webkit-outer-spin-button,
.ir-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.ir-input:focus {
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px var(--c-primary-soft);
}
.ir-input--pre { padding-left: 34px; }
.ir-select {
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    padding-right: 36px;
    font-size: 13.5px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238a93a8' stroke-width='3' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 13px center;
}
.ir-prefix {
    position: absolute;
    left: 14px;
    font-size: 13px;
    color: var(--c-text-muted);
    pointer-events: none;
}
.ir-suffix {
    position: absolute;
    right: 14px;
    font-size: 12px;
    color: var(--c-text-muted);
    pointer-events: none;
}
.ir-help {
    font-size: 11.5px;
    line-height: 1.65;
    color: var(--c-text-muted);
    margin-top: 6px;
}
.ir-help b { color: var(--c-text-sub); }

.btn-block { width: 100%; margin-top: 8px; }

/* ---------- 结果区 ---------- */
.ir-result-card { min-height: 340px; }
.ir-result-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    min-height: 320px;
    text-align: center;
    color: var(--c-text-muted);
    font-size: 13.5px;
    line-height: 1.8;
}
.ir-result-empty .emoji { font-size: 46px; opacity: 0.75; }

.ir-result-body { animation: irFade 0.28s ease; }
@keyframes irFade {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: none; }
}

.ir-hero {
    padding: 22px 24px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(240, 133, 28, 0.09));
    border: 1px solid rgba(239, 68, 68, 0.24);
    margin-bottom: 14px;
}
.ir-hero-label { font-size: 12.5px; color: var(--c-text-sub); margin-bottom: 6px; }
.ir-hero-num {
    display: flex;
    align-items: baseline;
    gap: 3px;
    line-height: 1.1;
    color: #e02424;
}
.ir-hero-num b { font-size: 40px; font-weight: 800; letter-spacing: -0.035em; }
.ir-hero-num .cur { font-size: 22px; font-weight: 700; }
.ir-hero-sub { font-size: 12.5px; color: var(--c-text-sub); margin-top: 8px; }

.ir-split {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 14px;
}
.ir-split-item {
    padding: 14px 16px;
    border-radius: 12px;
    background: var(--c-surface-soft);
    border: 1px solid var(--c-border);
}
.ir-split-num {
    font-size: 18px;
    font-weight: 800;
    color: var(--c-text);
    letter-spacing: -0.02em;
    margin-bottom: 4px;
}
.ir-split-key { font-size: 11.5px; color: var(--c-text-muted); }

/* 名义 vs 实际 差额可视化 */
.ir-gap {
    border: 1px solid var(--c-border);
    border-radius: 14px;
    padding: 14px 16px;
    margin-bottom: 14px;
    background: var(--c-surface-soft);
}
.ir-gap-row {
    display: grid;
    grid-template-columns: 64px minmax(0, 1fr) 70px;
    align-items: center;
    gap: 10px;
    margin-bottom: 9px;
}
.ir-gap-row:last-of-type { margin-bottom: 0; }
.ir-gap-k { font-size: 11.5px; color: var(--c-text-muted); }
.ir-gap-bar {
    display: block;
    height: 12px;
    border-radius: 99px;
    background: var(--c-bg-card);
    border: 1px solid var(--c-border);
    overflow: hidden;
}
.ir-gap-fill {
    display: block;
    height: 100%;
    border-radius: 99px;
    transition: width 0.35s ease;
}
.ir-gap-fill.is-nominal { background: linear-gradient(90deg, #8a93a8, #aab3c5); }
.ir-gap-fill.is-real { background: linear-gradient(90deg, #ef4444, #f0851c); }
.ir-gap-row b {
    font-size: 13.5px;
    font-weight: 800;
    color: var(--c-text);
    text-align: right;
}
.ir-gap-tip {
    font-size: 12.5px;
    line-height: 1.75;
    color: var(--c-text-sub);
    margin-top: 11px;
    padding-top: 11px;
    border-top: 1px dashed var(--c-border);
}
.ir-gap-tip b { color: #e02424; }

.ir-bill {
    list-style: none;
    border: 1px solid var(--c-border);
    border-radius: 14px;
    overflow: hidden;
    margin-bottom: 14px;
}
.ir-bill li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 16px;
    font-size: 13px;
    border-bottom: 1px solid var(--c-border);
}
.ir-bill li:last-child { border-bottom: none; }
.ir-bill .k { color: var(--c-text-sub); }
.ir-bill .v { font-weight: 700; color: var(--c-text); white-space: nowrap; }
.ir-bill li.total { background: var(--c-surface-soft); }
.ir-bill li.total .v { color: #e02424; font-size: 14.5px; }

.ir-note {
    font-size: 12.5px;
    line-height: 1.8;
    color: var(--c-text-sub);
    padding: 12px 14px;
    border-radius: 12px;
    background: var(--c-primary-soft);
    border: 1px dashed rgba(0, 102, 255, 0.28);
}
.ir-note b { color: var(--c-text); }

/* ---------- 表格 ---------- */
.ir-table-card {
    background: var(--c-bg-card);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 22px;
    margin-bottom: 20px;
}
.ir-table-head { margin-bottom: 14px; }
.ir-table-head .ir-title { margin-bottom: 5px; }
.ir-table-scroll {
    overflow-x: auto;
    border: 1px solid var(--c-border);
    border-radius: 12px;
    -webkit-overflow-scrolling: touch;
    max-height: 520px;
    overflow-y: auto;
}
.ir-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    min-width: 560px;
}
.ir-table thead th {
    text-align: right;
    padding: 12px 16px;
    font-size: 12.5px;
    font-weight: 700;
    color: var(--c-text-sub);
    background: var(--c-surface-soft);
    border-bottom: 1px solid var(--c-border);
    white-space: nowrap;
    position: sticky;
    top: 0;
    z-index: 1;
}
.ir-table thead th:first-child { text-align: left; }
.ir-table tbody td {
    padding: 11px 16px;
    text-align: right;
    color: var(--c-text-sub);
    border-bottom: 1px solid var(--c-border);
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}
.ir-table tbody td:first-child { text-align: left; }
.ir-table tbody tr:last-child td { border-bottom: none; }
.ir-table tbody td.c-fee { color: #e07800; font-weight: 700; }
.ir-table tbody td.c-rate { color: #7c5cff; font-weight: 700; }
.ir-table-empty {
    text-align: center !important;
    color: var(--c-text-muted) !important;
    padding: 30px 16px !important;
}

/* 对照矩阵：取消滚动高度限制 */
.ir-matrix th,
.ir-matrix td { text-align: center; }
.ir-matrix tbody td:first-child { text-align: left; }
.ir-matrix tbody td.is-active {
    background: rgba(239, 68, 68, 0.12);
    color: #e02424;
    font-weight: 800;
    box-shadow: inset 0 0 0 2px rgba(239, 68, 68, 0.35);
}
.ir-table-card .ir-table-scroll:has(.ir-matrix) { max-height: none; }

.ir-disclaim {
    font-size: 12px;
    line-height: 1.85;
    color: var(--c-text-muted);
    background: var(--c-surface-soft);
    border: 1px solid var(--c-border);
    border-radius: 12px;
    padding: 14px 16px;
    margin-bottom: 26px;
}
.ir-disclaim b { color: var(--c-text-sub); }
.ir-info { margin-bottom: 26px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
    .ir-layout { grid-template-columns: 1fr; }
    .ir-result-card { min-height: auto; }
    .ir-result-empty { min-height: 180px; }
}
@media (max-width: 620px) {
    .ir-card, .ir-table-card { padding: 18px; }
    .ir-hero-num b { font-size: 32px; }
    .ir-split { grid-template-columns: 1fr; }
    .ir-bill li { flex-direction: column; align-items: flex-start; gap: 4px; }
    .ir-gap-row { grid-template-columns: 56px minmax(0, 1fr) 62px; }
    .ir-table-scroll { max-height: none; }
}

/* ============ 黑夜模式 ============ */
[data-theme="dark"] .ir-input { background: rgba(255, 255, 255, 0.04); }
[data-theme="dark"] .ir-input option { background: #131c31; color: #e5e9f0; }
[data-theme="dark"] .ir-hero {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.2), rgba(240, 133, 28, 0.14));
    border-color: rgba(239, 68, 68, 0.34);
}
[data-theme="dark"] .ir-hero-num,
[data-theme="dark"] .ir-gap-tip b { color: #f87171; }
[data-theme="dark"] .ir-note {
    background: rgba(59, 130, 246, 0.12);
    border-color: rgba(59, 130, 246, 0.32);
}
[data-theme="dark"] .ir-split-item,
[data-theme="dark"] .ir-gap,
[data-theme="dark"] .ir-bill li.total,
[data-theme="dark"] .ir-table thead th,
[data-theme="dark"] .ir-disclaim { background: rgba(255, 255, 255, 0.03); }
[data-theme="dark"] .ir-bill li.total .v { color: #f87171; }
[data-theme="dark"] .ir-gap-bar { background: rgba(255, 255, 255, 0.06); }
[data-theme="dark"] .ir-gap-fill.is-nominal { background: linear-gradient(90deg, #4b5563, #6b7280); }
[data-theme="dark"] .ir-table tbody td.c-fee { color: #fbbf24; }
[data-theme="dark"] .ir-table tbody td.c-rate { color: #a78bff; }
[data-theme="dark"] .ir-matrix tbody td.is-active {
    background: rgba(239, 68, 68, 0.2);
    color: #f87171;
    box-shadow: inset 0 0 0 2px rgba(239, 68, 68, 0.44);
}