/* tools/calculator/style.css */
.tool-desc { color: var(--color-text-secondary); font-size: 1.05rem; margin: var(--space-sm) 0 var(--space-lg); }

.calc-card { max-width: 520px; margin: 0 auto; }

/* ---- 显示区 ---- */
.calc-display {
    background: #fff;
    border: 2px solid var(--color-border-sketch);
    border-radius: var(--radius-md);
    box-shadow: inset 2px 2px 0 rgba(74,74,74,0.05);
    padding: var(--space-md) var(--space-lg);
    margin-bottom: var(--space-md);
    text-align: right;
    overflow-x: auto;
}
.calc-expr {
    font-family: var(--font-mono);
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    min-height: 1.5em;
    word-break: break-all;
}
.expr-placeholder { color: var(--color-text-muted); opacity: 0.5; }
.calc-result {
    font-family: var(--font-mono);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary);
    min-height: 1.4em;
    word-break: break-all;
}
.calc-result.preview { font-size: 1.2rem; font-weight: 400; color: var(--color-text-muted); }
.calc-result.err { font-size: 1.05rem; font-weight: 400; color: var(--color-accent); }

/* ---- 按键区 ---- */
.keypad {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}
.key {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    padding: 12px 0;
    border: 2px solid var(--color-border-sketch);
    border-radius: var(--radius-sm);
    background: var(--color-card-bg);
    color: var(--color-text);
    cursor: pointer;
    box-shadow: 2.5px 2.5px 0 var(--color-border-sketch);
    transition: transform 0.1s, box-shadow 0.1s, background 0.1s;
    user-select: none;
}
.key:hover { transform: translate(-1px, -1px); box-shadow: 3.5px 3.5px 0 var(--color-border-sketch); }
.key:active { transform: translate(1px, 1px); box-shadow: none; }

.key-num { background: #fff; font-size: 1.25rem; }
.key-op { background: rgba(58,90,140,0.10); color: var(--color-primary); font-weight: 700; font-size: 1.25rem; }
.key-fn { background: var(--color-bg-paper); color: var(--color-text-secondary); font-size: 0.95rem; }
.key-danger { background: rgba(192,88,58,0.10); color: var(--color-accent); font-weight: 700; }
.key-mode { background: rgba(58,90,140,0.18); color: var(--color-primary); font-weight: 700; font-size: 0.95rem; }
.key-eq {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #fff;
    font-size: 1.4rem;
    font-weight: 700;
}
.key-eq:hover { background: var(--color-accent-light); }

/* ---- 历史 ---- */
.paper-card h3 { margin-bottom: var(--space-sm); color: var(--color-primary); }
.hist-list { list-style: none; padding: 0; margin: 0; }
.hist-item {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: var(--space-md);
    width: 100%;
    padding: 6px 10px;
    margin-bottom: 4px;
    border: 1.5px dashed var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg-paper);
    cursor: pointer;
    font-family: var(--font-mono);
    text-align: left;
    transition: background 0.12s;
}
.hist-item:hover { background: rgba(58,90,140,0.07); }
.hist-expr { color: var(--color-text-secondary); font-size: 0.92rem; word-break: break-all; }
.hist-res { color: var(--color-primary); font-weight: 700; white-space: nowrap; }

.hint { font-size: 0.85rem; color: var(--color-text-muted); margin-top: var(--space-sm); }

.info-box ul { margin-top: var(--space-sm); padding-left: var(--space-lg); }
.info-box li { margin-bottom: var(--space-xs); }
.info-box code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: rgba(58,90,140,0.08);
    border-radius: 4px;
    padding: 1px 6px;
}

@media (max-width: 560px) {
    .key { padding: 10px 0; font-size: 0.95rem; }
    .key-num { font-size: 1.1rem; }
    .calc-result { font-size: 1.5rem; }
}

/* 复制结果按钮：显示区右下角 */
.calc-display { position: relative; }
.calc-copy {
    position: absolute;
    right: 10px;
    bottom: 8px;
    font-size: 0.72rem;
    padding: 2px 8px;
    opacity: 0.75;
}
.calc-copy:hover { opacity: 1; }