/* ======================================================================
 *  在线科学计算器 /tool/sci-calc
 * ====================================================================== */

/* ---------- 卡片 ---------- */
.sci-card {
    padding: 22px;
    margin-bottom: 16px;
    background: var(--c-bg-card);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}
.sci-card-title { font-size: 15.5px; font-weight: 800; letter-spacing: -0.01em; }

/* ---------- 屏幕 ---------- */
.sci-screen {
    padding: 18px 20px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(41, 128, 185, 0.12), rgba(122, 92, 214, 0.08));
    border: 1px solid rgba(41, 128, 185, 0.28);
    margin-bottom: 16px;
}
.sci-screen-head { display: flex; justify-content: flex-end; margin-bottom: 6px; }
.sci-mode {
    padding: 2px 10px;
    font-size: 11.5px;
    font-weight: 800;
    letter-spacing: 0.06em;
    color: var(--c-primary);
    background: var(--c-bg-card);
    border: 1px solid var(--c-border);
    border-radius: 99px;
    cursor: pointer;
    user-select: none;
    transition: all 0.16s ease;
}
.sci-mode:hover { border-color: var(--c-primary); }
.sci-expr {
    font-size: 26px;
    font-weight: 800;
    line-height: 1.4;
    letter-spacing: 0.01em;
    color: var(--c-text);
    text-align: right;
    word-break: break-all;
    min-height: 38px;
    font-variant-numeric: tabular-nums;
}
.sci-result {
    margin-top: 4px;
    font-size: 15px;
    font-weight: 700;
    color: var(--c-text-muted);
    text-align: right;
    min-height: 22px;
    font-variant-numeric: tabular-nums;
    word-break: break-all;
}

/* ---------- 键盘 ---------- */
.sci-keys { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 9px; }
.sci-key {
    height: 54px;
    font-family: inherit;
    font-size: 16px;
    font-weight: 700;
    color: var(--c-text);
    background: var(--c-surface-soft);
    border: 1px solid var(--c-border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.14s ease;
    user-select: none;
}
.sci-key:hover { border-color: var(--c-primary); background: var(--c-primary-soft); }
.sci-key:active { transform: scale(0.96); }
.sci-key.sci-fn { font-size: 14.5px; color: var(--c-text-sub); }
.sci-key.sci-num { font-size: 19px; font-weight: 800; background: var(--c-bg-card); }
.sci-key.sci-eq {
    grid-row: span 3;
    font-size: 24px;
    color: #fff;
    background: var(--c-primary);
    border-color: var(--c-primary);
}
.sci-key.sci-eq:hover { background: var(--c-primary); filter: brightness(1.08); }
.sci-key.sci-zero { grid-column: span 2; }

.sci-tip { margin-top: 16px; font-size: 12.5px; line-height: 1.85; color: var(--c-text-muted); }
.sci-tip b { color: var(--c-text-sub); }

/* ---------- 历史 ---------- */
.sci-hist-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.sci-hist-clear {
    padding: 6px 14px;
    font-family: inherit;
    font-size: 12.5px;
    font-weight: 700;
    color: var(--c-text-sub);
    background: var(--c-surface-soft);
    border: 1px solid var(--c-border);
    border-radius: 99px;
    cursor: pointer;
    transition: all 0.16s ease;
}
.sci-hist-clear:hover { color: #d32f2f; border-color: #d32f2f; }
.sci-history { display: flex; flex-direction: column; gap: 8px; max-height: 320px; overflow-y: auto; }
.sci-hist-empty { font-size: 13px; color: var(--c-text-muted); padding: 12px 2px; }
.sci-hist-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 11px 14px;
    font-family: inherit;
    text-align: left;
    background: var(--c-surface-soft);
    border: 1px solid var(--c-border);
    border-radius: 11px;
    cursor: pointer;
    transition: all 0.16s ease;
}
.sci-hist-item:hover { border-color: var(--c-primary); background: var(--c-primary-soft); }
.sci-hist-item .e { flex: 1 1 auto; min-width: 0; font-size: 13.5px; font-weight: 700; color: var(--c-text-sub); word-break: break-all; }
.sci-hist-item .r { flex: 0 0 auto; font-size: 15px; font-weight: 800; color: var(--c-primary); font-variant-numeric: tabular-nums; }

/* ---------- 免责与简介 ---------- */
.sci-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;
}
.sci-disclaim b { color: var(--c-text-sub); }
.sci-info-block { margin-bottom: 26px; }

/* ---------- 响应式 ---------- */
@media (max-width: 560px) {
    .sci-card { padding: 18px; }
    .sci-expr { font-size: 22px; }
    .sci-key { height: 50px; font-size: 15px; }
    .sci-key.sci-num { font-size: 18px; }
    .sci-keys { gap: 7px; }
}

/* ============ 黑夜模式 ============ */
[data-theme="dark"] .sci-key,
[data-theme="dark"] .sci-mode,
[data-theme="dark"] .sci-hist-clear,
[data-theme="dark"] .sci-hist-item,
[data-theme="dark"] .sci-disclaim { background: rgba(255, 255, 255, 0.04); }
[data-theme="dark"] .sci-key.sci-num { background: rgba(255, 255, 255, 0.07); }
[data-theme="dark"] .sci-key.sci-eq { background: var(--c-primary); color: #fff; }
[data-theme="dark"] .sci-screen {
    background: linear-gradient(135deg, rgba(41, 128, 185, 0.18), rgba(122, 92, 214, 0.12));
    border-color: rgba(41, 128, 185, 0.36);
}