/* 码率体积计算器 media-bitrate 专用样式 */
.hidden { display: none !important; }
.br-modes { display: flex; gap: 8px; margin-bottom: 16px; }
.br-mode {
    padding: 9px 18px; border: 1px solid var(--border-color, #e3e8ee);
    background: var(--bg-body, #fff); color: var(--text-primary, #1f2a37);
    border-radius: 20px; font-size: 14px; cursor: pointer; transition: .15s;
}
.br-mode:hover { border-color: var(--primary, #ff6b00); }
.br-mode.active { background: var(--primary, #ff6b00); border-color: var(--primary, #ff6b00); color: #fff; }

.br-card {
    border: 1px solid var(--border-color, #e3e8ee); border-radius: 12px;
    padding: 18px; background: var(--bg-body, #fff);
    display: flex; flex-direction: column; gap: 16px; max-width: 520px;
}
.br-field { display: flex; flex-direction: column; gap: 6px; }
.br-field label { font-size: 13px; color: var(--text-secondary, #5b6675); }
.br-input {
    width: 100%; box-sizing: border-box; padding: 11px 13px;
    border: 1px solid var(--border-color, #e3e8ee); border-radius: 10px;
    font-size: 15px; background: var(--bg-body, #fff); color: var(--text-primary, #1f2a37); outline: none;
}
.br-input:focus { border-color: var(--primary, #ff6b00); }
.br-dur { display: flex; align-items: center; gap: 8px; }
.br-num {
    width: 72px; box-sizing: border-box; padding: 11px 10px; text-align: center;
    border: 1px solid var(--border-color, #e3e8ee); border-radius: 10px;
    font-size: 15px; background: var(--bg-body, #fff); color: var(--text-primary, #1f2a37); outline: none;
}
.br-num:focus { border-color: var(--primary, #ff6b00); }
.br-dur span { color: var(--text-secondary, #5b6675); font-weight: 700; }
.br-calc {
    align-self: flex-start; padding: 11px 28px; border: none; border-radius: 10px;
    background: var(--primary, #ff6b00); color: #fff; font-size: 15px; cursor: pointer;
}
.br-calc:hover { opacity: .9; }

.br-result { margin-top: 18px; }
.br-warn { color: #d23b3b; font-size: 14px; background: rgba(210,59,59,.08); padding: 10px 14px; border-radius: 8px; }
.br-out { border: 1px solid var(--border-color, #e3e8ee); border-radius: 12px; padding: 18px; background: var(--out-bg, #fafbfc); }
.br-big { font-size: 18px; color: var(--text-primary, #1f2a37); }
.br-big b { color: var(--primary, #ff6b00); font-size: 22px; }
.br-sub { font-size: 13px; color: var(--text-secondary, #5b6675); margin-top: 6px; }
.br-rec { margin-top: 12px; padding: 10px 14px; border-radius: 8px; font-size: 13px; }
.br-rec.good { background: rgba(26,138,74,.1); color: #1a8a4a; }
.br-rec.warn { background: rgba(196,127,0,.12); color: #c47f00; }
.br-line { margin-top: 10px; font-size: 13px; color: var(--text-secondary, #5b6675); }

.br-tip { margin-top: 16px; font-size: 13px; color: var(--text-secondary, #5b6675); line-height: 1.6; background: var(--out-bg, #f4f6f8); border: 1px solid var(--border-color, #e3e8ee); border-radius: 10px; padding: 12px 14px; }

@media (max-width: 520px) {
    .br-num { width: 100%; }
    .br-dur { flex-wrap: wrap; }
}