/* ==========================================================================
   进制转换器 - 紧凑现代主题
   命名前缀: .bc-*
   ========================================================================== */

.bc-page-header { margin-bottom: 16px; }
.bc-page-title {
    font: 700 28px/1.2 var(--yst-font);
    letter-spacing: var(--yst-letter-spacing);
    color: var(--yst-text);
    margin: 0 0 8px;
}
.bc-page-desc {
    font-size: 14px;
    color: var(--yst-text-2);
    margin: 0 0 14px;
}
.bc-feature-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.bc-tag {
    display: inline-flex;
    align-items: center;
    height: 22px;
    padding: 0 9px;
    background: var(--yst-bg-subtle);
    border: 1px solid var(--yst-border);
    border-radius: 5px;
    color: var(--yst-text-muted);
    font: 600 11px/1 var(--yst-font-mono, monospace);
    letter-spacing: 0.5px;
    text-transform: lowercase;
}

/* 主卡 */
.bc-card { padding: 18px 20px; margin-bottom: 14px; }

/* 4 进制网格 */
.bc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 12px;
    margin-bottom: 16px;
}

.bc-input-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.bc-input-group label {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    cursor: pointer;
}
.bc-label-title {
    font: 700 13px var(--yst-font);
    color: var(--yst-text);
    letter-spacing: var(--yst-letter-spacing);
}
.bc-label-hint {
    font: 600 10px/1 var(--yst-font-mono, monospace);
    color: var(--yst-text-muted);
    background: var(--yst-bg-subtle);
    padding: 2px 7px;
    border-radius: 999px;
    letter-spacing: 0.3px;
}

.bc-input {
    height: 44px;
    padding: 0 14px;
    background: #fafafa;
    border: 1.5px solid var(--yst-border);
    border-radius: 8px;
    color: var(--yst-text);
    font: 600 15px/1 var(--yst-font-mono, "SF Mono", monospace);
    letter-spacing: 0.5px;
    word-break: break-all;
    transition: border-color .15s, box-shadow .15s, background .15s;
    outline: none;
    width: 100%;
}
.bc-input:focus {
    background: #fff;
    border-color: var(--yst-brand);
    box-shadow: 0 0 0 3px rgba(0, 158, 148, 0.12);
}
.bc-input.error,
.bc-input:invalid {
    border-color: var(--yst-danger, #dc2626);
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.bc-error {
    font: 11px var(--yst-font);
    color: var(--yst-danger, #dc2626);
    min-height: 14px;
}

/* 操作按钮 */
.bc-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.bc-btn-danger {
    color: var(--yst-danger, #dc2626) !important;
    border-color: rgba(220, 38, 38, 0.3) !important;
}
.bc-btn-danger:hover {
    background: rgba(220, 38, 38, 0.08) !important;
    color: var(--yst-danger, #dc2626) !important;
    border-color: var(--yst-danger, #dc2626) !important;
}

/* 信息卡 */
.bc-info { padding: 18px 22px; margin-bottom: 14px; }
.bc-feature h3 {
    font: 700 14px/1.4 var(--yst-font);
    color: var(--yst-text);
    margin: 0 0 6px;
    position: relative;
    padding-left: 12px;
}
.bc-feature h3::before {
    content: "";
    position: absolute;
    left: 0; top: 5px; bottom: 5px;
    width: 3px;
    background: var(--yst-brand);
    border-radius: 0 2px 2px 0;
}
.bc-feature p {
    font: 13px/1.6 var(--yst-font);
    color: var(--yst-text-2);
    margin: 0;
}
.bc-info code {
    padding: 1px 6px;
    background: var(--yst-bg-subtle);
    border: 1px solid var(--yst-border);
    border-radius: 3px;
    font: 12px var(--yst-font-mono, monospace);
    color: var(--yst-brand);
}

/* Toast */
.bc-toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 10px 22px;
    border-radius: 999px;
    background: var(--yst-brand);
    color: #fff;
    font: 600 13px var(--yst-font);
    box-shadow: 0 8px 20px rgba(0, 158, 148, 0.32);
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity .25s, transform .25s;
}
.bc-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* 移动端 */
@media (max-width: 768px) {
    .bc-page-title { font-size: 22px; }
    .bc-card, .bc-info { padding: 14px 14px; }
    .bc-grid { grid-template-columns: 1fr; }
}