/* Chat Sidebar — passage/essay conversation panel
   Same DNA as search page: terminal output, amber/blue accents,
   warm cream paper. No bubbles, no shadows, no gradients. */

:root {
    --chat-default-width: 420px;
    --chat-min-width: 320px;
    --chat-max-width: 640px;
}

/* ═══ Layout ═══ */

.page-with-chat {
    display: flex;
    height: 100%;
    min-height: 600px;
    overflow: hidden;
}

.chat-sidebar {
    width: var(--chat-default-width);
    min-width: var(--chat-min-width);
    max-width: var(--chat-max-width);
    background: var(--primary-bg);
    border-right: 2px solid rgba(74, 144, 217, 0.15);
    display: flex;
    flex-direction: column;
    position: relative;
    flex-shrink: 0;
}

.chat-divider {
    width: 3px;
    background: var(--border-color);
    cursor: col-resize;
    flex-shrink: 0;
    transition: background 0.2s;
    position: relative;
    opacity: 0.25;
}

.chat-divider:hover {
    opacity: 0.6;
}

.chat-divider::after {
    content: '';
    position: absolute;
    top: 0;
    left: -4px;
    right: -4px;
    bottom: 0;
}

.content-area {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    background: transparent;
    scroll-behavior: smooth;
}

.page-with-chat .reading-list-rail {
    height: 100%;
    background: var(--surface-panel);
}

.page-with-chat .reading-list-panel {
    background: var(--surface-panel);
    border-left: 1px solid var(--border-subtle);
}

.page-with-chat .reading-list-strip {
    background: var(--surface-header);
    border-left: 1px solid var(--border-subtle);
}

.page-with-chat .reading-list-rail-divider::before {
    background: var(--border-strong);
}

.content-area .container {
    max-width: 1260px;
    margin: 0 auto;
    padding: 38px 28px;
    height: auto;
    overflow: visible;
}

.content-area .passage-container { height: auto; overflow: visible; max-width: 920px; margin-left: auto; margin-right: auto; }
.content-area .passage-side { height: auto; overflow: visible; }
.content-area .tab-container { overflow: visible; height: auto; }
.content-area .tab-content { min-height: unset; height: auto; overflow: visible; }
.content-area .passage-content { height: auto; overflow: visible; }
.content-area .summary-editor { height: auto; overflow: visible; }
.content-area .summary-textarea { resize: vertical; max-height: 600px; }
.content-area .note-input-container { height: auto; overflow: visible; }
.content-area .note-input-wrapper { height: auto; overflow: visible; }

body:has(.page-with-chat),
body.has-chat-layout {
    overflow: hidden;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

body:has(.page-with-chat) main,
body.has-chat-layout main {
    overflow: visible;
    flex: 1;
    min-height: 0;
}

/* ═══ Header ═══ */

.chat-header {
    padding: 10px 14px;
    background: var(--primary-bg);
    border-bottom: 1px solid var(--border-subtle);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

.chat-title {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    color: var(--primary-text);
    margin: 0;
}

.chat-title::before {
    content: '# ';
    color: var(--border-color);
    opacity: 0.5;
}

.chat-metadata {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--secondary-text, var(--secondary-text));
    display: flex;
    gap: 8px;
    margin-left: auto;
    opacity: 0.6;
}

.chat-metadata-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.chat-assistant-select {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--primary-text);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 2px 6px;
}

/* ═══ Messages area ═══ */

.chat-messages {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 14px 14px;
    display: flex;
    flex-direction: column;
    gap: 0;
    background: var(--primary-bg);
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

.chat-messages::-webkit-scrollbar { width: 5px; }
.chat-messages::-webkit-scrollbar-track { background: transparent; }
.chat-messages::-webkit-scrollbar-thumb { background: var(--border-medium); border-radius: 3px; }
.chat-messages::-webkit-scrollbar-thumb:hover { background: var(--border-strong); }

/* ═══ Empty state ═══ */

.chat-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 40px 20px;
    text-align: center;
}

.chat-empty-state-icon {
    font-family: var(--font-mono);
    font-size: 14px;
    margin-bottom: 8px;
    color: var(--secondary-text, var(--secondary-text));
    opacity: 0.4;
}

.chat-empty-state-text {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--secondary-text, var(--secondary-text));
    margin: 0;
    line-height: 1.6;
    max-width: 200px;
    opacity: 0.6;
}

/* ═══ Messages — same structure as search page chat ═══ */

.message {
    display: flex;
    flex-direction: column;
    gap: 0;
    max-width: 100%;
    animation: termFadeIn 0.25s ease-out;
    padding: 0;
}

.message + .message {
    margin-top: 4px;
}

/* Turn separator — breathing room between conversation turns */
.message.assistant + .message.user {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--surface-hover);
}

/* Staggered fade-in */
.message:nth-child(2) { animation-delay: 0.05s; }
.message:nth-child(3) { animation-delay: 0.1s; }
.message:nth-child(4) { animation-delay: 0.15s; }
.message:nth-child(5) { animation-delay: 0.2s; }
.message:nth-child(n+6) { animation-delay: 0.25s; }

/* Role labels — hidden, color IS the role indicator */
.message-role {
    display: none;
}

.message-content {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    word-wrap: break-word;
    white-space: pre-wrap;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 4px;
    color: var(--primary-text, var(--primary-text));
    transition: background 0.12s ease;
}

.message-text {
    padding-bottom: 0;
}

/* ── User — amber prompt line (identical to search page) ── */

.message.user .message-content {
    background: transparent;
    padding: 10px 12px;
    border-radius: 4px;
    display: flex;
    align-items: baseline;
}

.message.user:hover .message-content {
    background: rgba(46, 196, 122, 0.04);
}

.message.user .message-content::before {
    content: '>';
    color: var(--gem-emerald);
    font-weight: 700;
    font-size: 15px;
    flex-shrink: 0;
    margin-right: 10px;
    line-height: 1;
}

.message.user .message-text {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.5;
    color: var(--primary-text, var(--primary-text));
    font-weight: 600;
}

.message.user .message-timestamp {
    font-size: 10px;
    color: var(--secondary-text, var(--secondary-text));
    opacity: 0;
    margin-left: auto;
    flex-shrink: 0;
    padding-left: 12px;
    align-self: center;
    transition: opacity 0.15s ease;
}

.message.user:hover .message-timestamp {
    opacity: 0.5;
}

/* ── Assistant — blue-bordered response block (identical to search page) ── */

.message.assistant .message-content {
    background: var(--surface-subtle);
    border: none;
    padding: 12px 14px;
    border-radius: 4px;
    margin-left: 24px;
    margin-bottom: 4px;
    font-style: normal;
}

.message.assistant:hover .message-content {
    background: var(--surface-hover);
}

.message.assistant.error .message-content {
    background: rgba(230, 57, 70, 0.06);
}

.message.assistant .message-text {
    font-family: var(--font-mono);
    font-size: 13px;
    font-style: normal;
    color: var(--text-bright);
    line-height: 1.7;
}

.message.assistant.error .message-text {
    color: var(--gem-ruby);
}

.message.assistant .message-timestamp {
    font-size: 10px;
    color: var(--secondary-text, var(--secondary-text));
    opacity: 0;
    margin-top: 6px;
    transition: opacity 0.15s ease;
}

.message.assistant:hover .message-timestamp {
    opacity: 0.4;
}

/* ═══ Input — same language as search page input bar ═══ */

.chat-input-container {
    padding: 8px 10px;
    background: var(--primary-bg);
    border-top: 1px solid var(--border-subtle);
    flex-shrink: 0;
}

/* Outer shell for the spinning border effect */
.chat-input-wrapper {
    position: relative;
    border-radius: 4px;
    padding: 2px;
    background: var(--border-medium);
    transition: background 0.3s;
}

/* Inner container — fully opaque to mask the gradient */
.chat-input-wrapper > form,
.chat-input-wrapper > .chat-input-actions {
    position: relative;
    z-index: 1;
    background: var(--surface-panel);
}

.chat-input-wrapper > form {
    border-radius: 3px 3px 0 0;
}

.chat-input-wrapper > .chat-input-actions {
    border-radius: 0 0 3px 3px;
}

.chat-input-wrapper:focus-within {
    background: var(--gem-emerald);
}

.chat-input-wrapper:focus-within > form,
.chat-input-wrapper:focus-within > .chat-input-actions {
    background: var(--surface-input);
}

/* Chasing light — irregular rhythm, fast-slow-fast */
.chat-input-wrapper:has(.chat-input:disabled) {
    background: conic-gradient(
        from var(--spinner-angle, 0deg),
        var(--gem-emerald) 0deg,
        transparent 30deg,
        var(--border-medium) 60deg
    );
    animation: border-spin 3s ease-in-out infinite;
}

@keyframes border-spin {
    0%   { --spinner-angle: 0deg; }
    15%  { --spinner-angle: 140deg; }   /* fast burst */
    30%  { --spinner-angle: 160deg; }   /* slow crawl */
    45%  { --spinner-angle: 280deg; }   /* fast again */
    55%  { --spinner-angle: 290deg; }   /* pause */
    70%  { --spinner-angle: 330deg; }   /* medium */
    85%  { --spinner-angle: 345deg; }   /* slow */
    100% { --spinner-angle: 360deg; }   /* snap to start */
}

@property --spinner-angle {
    syntax: '<angle>';
    initial-value: 0deg;
    inherits: false;
}

@keyframes border-spin {
    to { --spinner-angle: 360deg; }
}

@property --spinner-angle {
    syntax: '<angle>';
    initial-value: 0deg;
    inherits: false;
}

.chat-input-form {
    position: relative;
    width: 100%;
}

.chat-input {
    width: 100%;
    font-family: var(--font-mono);
    font-size: 13px;
    padding: 10px 44px 10px 12px;
    border: none;
    background: transparent;
    color: var(--primary-text, var(--primary-text));
    resize: none;
    min-height: 60px;
    max-height: 200px;
    line-height: 1.5;
    box-sizing: border-box;
}

.chat-input:focus { outline: none; }

.chat-input::placeholder {
    color: var(--secondary-text, var(--secondary-text));
    opacity: 0.5;
}

.chat-attachments {
    padding: 6px 10px;
    border-top: 1px solid var(--border-subtle);
    background: var(--surface-subtle);
    display: none;
}

.chat-attachments.has-items { display: block; }

.chat-attachment-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 6px 3px 8px;
    background: var(--primary-bg);
    border: 1px solid var(--border-color, var(--border-color));
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 10px;
    margin: 2px;
}

.chat-attachment-remove {
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 3px;
    color: var(--secondary-text, var(--secondary-text));
    transition: all 0.15s ease;
}

.chat-attachment-remove:hover {
    background: rgba(0, 0, 0, 0.1);
    color: var(--primary-text, var(--primary-text));
}

.chat-input-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 6px 10px;
    border-top: 1px solid var(--border-subtle);
    background: var(--surface-subtle);
}

.chat-input-tools {
    display: flex;
    gap: 4px;
}

.chat-tool-btn {
    padding: 6px;
    background: transparent;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    color: var(--secondary-text, var(--secondary-text));
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.chat-tool-btn:hover {
    color: var(--primary-text, var(--primary-text));
    background: rgba(74, 144, 217, 0.04);
}

.chat-send-btn {
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: bold;
    padding: 0;
    width: 32px;
    height: 32px;
    background: var(--gem-emerald);
    color: #0D0D0D;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: none;
}

.chat-send-btn:hover:not(:disabled) {
    background: #22A862;
    box-shadow: var(--shadow-light);
}

.chat-send-btn:active:not(:disabled) {
    opacity: 0.8;
}

.chat-send-spinner {
    display: none;
    width: 14px;
    height: 14px;
    border: 2px solid transparent;
    border-top-color: var(--primary-bg);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.chat-send-btn:disabled .chat-send-icon { display: none; }
.chat-send-btn:disabled .chat-send-spinner { display: block; }
.chat-send-btn:disabled { background: rgba(46, 196, 122, 0.15); color: rgba(46, 196, 122, 0.4); cursor: wait; box-shadow: none; }

@keyframes spin { to { transform: rotate(360deg); } }

.chat-input:disabled {
    opacity: 0.7;
    cursor: wait;
}

/* ═══ Loading ═══ */

.chat-loading {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 12px;
    color: var(--secondary-text, var(--secondary-text));
    font-family: var(--font-mono);
    font-size: 11px;
}

.chat-loading-dots {
    display: flex;
    gap: 3px;
}

.chat-loading-dot {
    width: 5px;
    height: 5px;
    background: var(--border-color, var(--border-color));
    border-radius: 50%;
    animation: loadingDot 1.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.chat-loading-dot:nth-child(2) { animation-delay: 0.15s; }
.chat-loading-dot:nth-child(3) { animation-delay: 0.3s; }

@keyframes loadingDot {
    0%, 70%, 100% { opacity: 0.25; transform: scale(0.85); }
    35% { opacity: 1; transform: scale(1); }
}

/* ═══ Error ═══ */

.chat-error {
    padding: 10px 12px;
    background: transparent;
    background: rgba(230, 57, 70, 0.06); border-radius: 3px;
    color: var(--border-red, var(--gem-ruby));
    font-family: var(--font-mono);
    font-size: 11px;
    margin: 6px 0 6px 8px;
}

/* ═══ Suggestions — same as search tips ═══ */

.chat-suggestions {
    padding: 8px 14px;
    background: transparent;
}

.chat-suggestions-label {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 400;
    color: var(--secondary-text, var(--secondary-text));
    margin: 0 0 8px 0;
    opacity: 0.7;
}

.chat-suggestions-label::before {
    content: '# ';
    color: var(--border-color, var(--border-color));
    opacity: 0.5;
}

.chat-suggestions-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin: 0;
    padding-left: 0;
    list-style-type: none;
}

.chat-suggestion-btn {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--primary-text, var(--primary-text));
    line-height: 1.5;
    padding: 6px 8px 6px 24px;
    margin-bottom: 4px;
    margin-left: -4px;
    position: relative;
    cursor: pointer;
    border: none;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    text-align: left;
    transition: opacity 0.15s, color 0.15s, background 0.15s, border-color 0.15s;
    display: block;
    box-shadow: none;
    width: 100%;
}

.chat-suggestion-btn::before {
    content: "~";
    position: absolute;
    left: 8px;
    font-weight: 700;
    color: var(--border-color);
}

.chat-suggestion-btn:hover {
    background: var(--surface-subtle);
    background: var(--surface-hover);
    transform: none;
    box-shadow: none;
}

.chat-suggestion-btn:active {
    transform: none;
    box-shadow: none;
}

.suggestion-text {
    flex: 1;
}

.suggestion-arrow {
    display: none;
}