/* DeepTutor 视图 —— iframe 承载独立 Web 应用 */
#deeptutor-view.view-content {
    height: 100%;
}

.dt-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    box-sizing: border-box;
    background: var(--bg-primary, #fff);
}

.dt-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 20px 12px;
    border-bottom: 1px solid var(--border-color, #e5e7eb);
    flex-wrap: wrap;
}

.dt-title-wrap {
    min-width: 0;
}

.dt-title {
    margin: 0 0 4px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary, #1f2937);
}

.dt-sub {
    margin: 0;
    font-size: 13px;
    color: var(--text-secondary, #6b7280);
}

.dt-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.dt-url {
    width: 320px;
    max-width: 50vw;
    padding: 8px 10px;
    font-size: 13px;
    border: 1px solid var(--border-color, #d1d5db);
    border-radius: 6px;
    background: var(--bg-input, #fff);
    color: var(--text-primary, #1f2937);
    outline: none;
}

.dt-url:focus {
    border-color: var(--accent-color, #3b82f6);
}

.dt-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin: 10px 20px 0;
    padding: 8px 12px;
    font-size: 13px;
    line-height: 1.5;
    color: var(--text-secondary, #6b7280);
    background: var(--bg-info, #eff6ff);
    border: 1px solid var(--border-info, #bfdbfe);
    border-radius: 6px;
}

.dt-banner code {
    padding: 1px 5px;
    font-size: 12px;
    border-radius: 4px;
    background: rgba(59, 130, 246, 0.12);
    color: var(--accent-color, #2563eb);
}

.dt-banner-close {
    flex: none;
    border: none;
    background: transparent;
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
    color: var(--text-secondary, #6b7280);
}

.dt-banner-close:hover {
    color: var(--text-primary, #1f2937);
}

.dt-frame-wrap {
    position: relative;
    flex: 1 1 auto;
    min-height: 0;
    margin: 12px 20px 16px;
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: 8px;
    overflow: hidden;
}

.dt-frame {
    width: 100%;
    height: 100%;
    border: none;
    background: #fff;
}

.dt-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-overlay, rgba(248, 250, 252, 0.96));
}

.dt-overlay-card {
    max-width: 420px;
    padding: 28px 32px;
    text-align: center;
    background: var(--bg-primary, #fff);
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

.dt-overlay-icon {
    font-size: 40px;
    margin-bottom: 8px;
}

.dt-overlay-card h3 {
    margin: 0 0 10px;
    font-size: 17px;
    color: var(--text-primary, #1f2937);
}

.dt-overlay-card p {
    margin: 0 0 18px;
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-secondary, #6b7280);
}

.dt-overlay-card code {
    padding: 1px 5px;
    font-size: 12px;
    border-radius: 4px;
    background: rgba(59, 130, 246, 0.12);
    color: var(--accent-color, #2563eb);
}