/* ===========================
   Author Chat Sidebar Panel
   =========================== */

.author-chat-panel {
    position: fixed;
    right: 0;
    top: var(--header-height, 56px);
    bottom: 0;
    width: 400px;
    max-width: 90vw;
    background: var(--color-bg-secondary);
    border-left: 1px solid var(--color-border);
    box-shadow: -2px 0 8px rgba(0, 0, 0, 0.1);
    z-index: 200;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: translateX(100%);
    transition: transform var(--transition-normal, 0.3s ease);
}

.author-chat-panel.open {
    transform: translateX(0);
}

.author-chat-panel .panel-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
    min-height: 48px;
    flex-shrink: 0;
}

.author-chat-panel .panel-header h2 {
    font-size: 0.95rem;
    font-weight: 600;
    font-family: var(--font-sans);
    margin: 0;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.panel-back-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--color-text-primary);
    cursor: pointer;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
    flex-shrink: 0;
}

.panel-back-btn:hover {
    background: var(--color-bg-tertiary);
}

/* ===========================
   Author List View
   =========================== */

.author-chat-panel .panel-content {
    flex: 1;
    overflow-y: auto;
    padding: 0;
}

.author-list {
    padding: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.author-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--author-accent-color, #7B4B94);
    background: var(--color-bg-primary);
    cursor: pointer;
    transition: background var(--transition-fast), box-shadow var(--transition-fast);
}

.author-card:hover {
    background: var(--color-bg-tertiary);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.author-card-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--author-accent-color, #7B4B94);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    font-family: var(--font-sans);
    flex-shrink: 0;
    letter-spacing: -0.5px;
    overflow: hidden;
}

.author-card-avatar--image {
    background: transparent;
    border: 2px solid var(--color-border, #d0d0d0);
}

.author-card-avatar--image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(100%) contrast(1.15) brightness(1.05);
    transition: filter var(--transition-fast, 0.15s);
}

.author-card:hover .author-card-avatar--image img {
    filter: grayscale(30%) contrast(1.1) brightness(1.05);
}

.author-card-info {
    flex: 1;
    min-width: 0;
}

.author-card-name {
    font-weight: 600;
    font-size: 0.9rem;
    font-family: var(--font-sans);
    color: var(--color-text-primary);
    margin-bottom: 2px;
}

.author-card-era {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    font-family: var(--font-sans);
}

.author-card-bio {
    font-size: 0.78rem;
    color: var(--color-text-secondary);
    font-family: var(--font-sans);
    margin-top: 4px;
    line-height: 1.35;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.author-card-arrow {
    color: var(--color-text-tertiary);
    flex-shrink: 0;
}

/* ===========================
   Chat Thread View
   =========================== */

.author-chat-thread-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.author-chat-reading-context {
    padding: 8px 14px;
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    font-family: var(--font-sans);
    background: var(--color-bg-tertiary);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

.author-chat-reading-context:empty {
    display: none;
}

.author-chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Message bubbles */
.author-msg {
    max-width: 88%;
    padding: 10px 14px;
    border-radius: 12px;
    font-size: 0.88rem;
    line-height: 1.5;
    font-family: var(--font-sans);
    word-wrap: break-word;
}

.author-msg.greeting,
.author-msg.author {
    align-self: flex-start;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--author-accent-color, #7B4B94);
    color: var(--color-text-primary);
}

.author-msg.student {
    align-self: flex-end;
    background: var(--color-accent, #2563eb);
    color: #fff;
    border-radius: 12px 12px 4px 12px;
}

.author-msg.streaming {
    position: relative;
}

.author-msg.streaming::after {
    content: '';
    display: inline-block;
    width: 4px;
    height: 14px;
    background: var(--author-accent-color, #7B4B94);
    margin-left: 2px;
    vertical-align: text-bottom;
    animation: authorChatBlink 0.8s step-end infinite;
}

@keyframes authorChatBlink {
    50% { opacity: 0; }
}

/* Markdown in author messages */
.author-msg p {
    margin: 0 0 0.5em;
}
.author-msg p:last-child {
    margin-bottom: 0;
}
.author-msg strong {
    font-weight: 600;
}
.author-msg em {
    font-style: italic;
}

/* ===========================
   Input Area
   =========================== */

.author-chat-input-area {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
    flex-shrink: 0;
}

.author-chat-input-area input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-size: 0.88rem;
    font-family: var(--font-sans);
    outline: none;
    transition: border-color var(--transition-fast);
}

.author-chat-input-area input:focus {
    border-color: var(--color-accent, #2563eb);
}

.author-chat-input-area input::placeholder {
    color: var(--color-text-tertiary);
}

#authorChatSendBtn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 50%;
    background: var(--color-accent, #2563eb);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity var(--transition-fast), background var(--transition-fast);
    flex-shrink: 0;
}

#authorChatSendBtn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

#authorChatSendBtn:not(:disabled):hover {
    opacity: 0.85;
}

/* ===========================
   Per-Author Accent Colors (Vol 2)
   =========================== */

.author-adams    { --author-accent-color: #8B6914; }
.author-stanton  { --author-accent-color: #5B3A6B; }
.author-anthony  { --author-accent-color: #C05746; }
.author-chisholm { --author-accent-color: #2E6B4B; }
.author-blackmun { --author-accent-color: #36454F; }
.author-alito    { --author-accent-color: #4A2C2A; }

/* ===========================
   Dark Theme
   =========================== */

[data-theme="dark"] .author-chat-panel {
    box-shadow: -2px 0 12px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .author-card {
    border-color: var(--color-border);
}

[data-theme="dark"] .author-card-avatar--image {
    border-color: var(--color-border, #444);
}

[data-theme="dark"] .author-card-avatar--image img {
    filter: grayscale(100%) contrast(1.1) brightness(0.9);
}

[data-theme="dark"] .author-card:hover .author-card-avatar--image img {
    filter: grayscale(30%) contrast(1.1) brightness(0.9);
}

[data-theme="dark"] .author-msg.student {
    background: var(--color-accent, #3b82f6);
}

/* ===========================
   Sepia Theme
   =========================== */

[data-theme="sepia"] .author-msg.student {
    background: #6b5b3e;
}

/* ===========================
   Mobile Responsive
   =========================== */

@media (max-width: 767px) {
    .author-chat-panel {
        width: 100vw;
        max-width: 100vw;
    }
}

@media print {
    .author-chat-panel {
        display: none !important;
    }
}