/* ============================================================================
   Chat thinking panel — premium on-brand reasoning surface
   ============================================================================
   Matches the rest of the app: dark glass surface, Syne display label, subtle
   gradient accent bar, DM Sans body, monospace reasoning body. No flashy
   generic icons — the only "live" affordance is a small pulsing status dot
   anchored to the gradient bar on the left edge.
   ============================================================================ */

.chat-thinking-panel {
    /* Theme-aware tokens (fall back to the page tokens / dark defaults) */
    --tp-surface: #121212;
    --tp-surface-2: #121212;
    --tp-border: transparent;
    --tp-border-soft: transparent;
    --tp-text: var(--text, #ededed);
    --tp-muted: var(--muted, #9a9a9a);
    --tp-faint: rgba(255, 255, 255, 0.55);
    --tp-accent: #e0e0e0;
    --tp-radius: 0;
    --tp-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', 'Fira Code', Menlo, Consolas, monospace;

    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 600px;
    margin: 0.5rem 0;
    padding: 0;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--tp-radius);
    background: var(--tp-surface);
    color: var(--tp-text);
    font-family: var(--tp-mono);
    overflow: hidden;
    position: relative;
    box-shadow: none;
    animation: thinking-panel-rise 0.32s cubic-bezier(0.4, 0, 0.2, 1) both;
    /* Align panel to the left */
    align-self: flex-start;
}

@keyframes thinking-panel-rise {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Vertical line removed at user request (simple square look) */
.chat-thinking-panel::before {
    display: none;
}

.chat-thinking-panel.is-active::before {
    opacity: 1;
}

.chat-thinking-panel.is-collapsed::before {
    opacity: 0.6;
}

.chat-thinking-panel.is-hidden { display: none !important; }

/* -----------------------------------------------------------------------
   Header (the always-visible row)
   ----------------------------------------------------------------------- */
.chat-thinking-header {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    width: 100%;
    padding: 0.6rem 0.95rem;
    background: transparent;
    border: none;
    color: var(--tp-text);
    font: inherit;
    text-align: left;
    cursor: pointer;
    user-select: none;
    transition: background 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

.chat-thinking-header:hover {
    background: rgba(255, 255, 255, 0.025);
}

.chat-thinking-header:focus-visible {
    outline: 1.5px solid var(--tp-accent);
    outline-offset: -2px;
    border-radius: var(--tp-radius);
}

/* "Live" affordance: a small dot + the status word. Replaces the generic
   brain icon — feels native to the rest of the app's loading surfaces. */
.chat-thinking-status {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.chat-thinking-status-mark {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--tp-muted);
    transition: background 0.3s ease;
    position: relative;
    flex-shrink: 0;
}

.chat-thinking-panel.is-active .chat-thinking-status-mark {
    background: var(--tp-accent);
    animation: thinking-status-pulse 1.6s ease-in-out infinite;
}

.chat-thinking-panel.is-collapsed .chat-thinking-status-mark {
    background: var(--tp-muted);
    animation: none;
}

@keyframes thinking-status-pulse {
    0%, 100% { 
        opacity: 1;
        transform: scale(1);
    }
    50% { 
        opacity: 0.5;
        transform: scale(0.9);
    }
}

.chat-thinking-status-text {
    font-family: var(--tp-mono);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--tp-muted);
    line-height: 1;
}

.chat-thinking-panel.is-active .chat-thinking-status-text {
    color: var(--tp-text);
}

.chat-thinking-panel.is-collapsed .chat-thinking-status-text {
    /* Hide the "THINKING" tag in collapsed mode — the dot is enough. */
    display: none;
}

.chat-thinking-label {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--tp-text);
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: -0.005em;
}

.chat-thinking-panel.is-collapsed .chat-thinking-label {
    color: var(--tp-muted);
    font-weight: 400;
    font-family: var(--tp-mono);
    font-size: 0.8rem;
    letter-spacing: 0;
}

.chat-thinking-timer {
    font-variant-numeric: tabular-nums;
    font-size: 0.72rem;
    color: var(--tp-muted);
    flex-shrink: 0;
    min-width: 30px;
    text-align: right;
    font-family: var(--tp-mono);
    letter-spacing: 0.02em;
}

.chat-thinking-panel.is-collapsed .chat-thinking-timer {
    display: none;
}

.chat-thinking-chevron {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--tp-muted);
    flex-shrink: 0;
    margin-left: 0.1rem;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), color 0.25s ease;
}

.chat-thinking-panel.is-expanded .chat-thinking-chevron {
    transform: rotate(180deg);
    color: var(--tp-text);
}

/* -----------------------------------------------------------------------
   Body (expanded reasoning surface)
   ----------------------------------------------------------------------- */
.chat-thinking-body {
    max-height: 320px;
    overflow-y: auto;
    padding: 0.55rem 0.95rem 0.95rem;
    border-top: none;
    background: var(--tp-surface-2);
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.10) transparent;
    animation: thinking-body-reveal 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.chat-thinking-body::-webkit-scrollbar { width: 4px; }
.chat-thinking-body::-webkit-scrollbar-track { background: transparent; }
.chat-thinking-body::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.10);
    border-radius: 2px;
}

@keyframes thinking-body-reveal {
    from { opacity: 0; transform: translateY(-3px); }
    to   { opacity: 1; transform: translateY(0); }
}

.chat-thinking-content {
    color: rgba(255, 255, 255, 0.85);
    font-family: var(--tp-mono);
    font-size: 0.78rem;
    line-height: 1.7;
    white-space: pre-wrap;
    word-wrap: break-word;
    position: relative;
    font-style: normal;
}

/* Blinking cursor that signals "still streaming" */
.chat-thinking-content::after {
    content: '';
    display: inline-block;
    width: 5px;
    height: 1em;
    margin-left: 2px;
    vertical-align: text-bottom;
    background: var(--tp-accent);
    animation: thinking-cursor-blink 1s steps(2) infinite;
    opacity: 0.65;
    border-radius: 1px;
}

.chat-thinking-panel.is-collapsed .chat-thinking-content::after { display: none; }

@keyframes thinking-cursor-blink {
    0%, 100% { opacity: 0; }
    50%      { opacity: 0.75; }
}

/* "No reasoning received" placeholder. Shown by JS only when the model
   hasn't emitted any reasoning tokens after a few seconds (the model may
   not support it). Kept intentionally subtle. */
.chat-thinking-empty {
    color: var(--tp-muted);
    font-family: var(--tp-mono);
    font-size: 0.78rem;
    font-style: normal;
    letter-spacing: 0.01em;
    opacity: 0.7;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chat-thinking-empty::before {
    content: '';
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--tp-muted);
    flex-shrink: 0;
    opacity: 0.6;
}

/* -----------------------------------------------------------------------
   Reduced motion + responsive + light theme
   ----------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    .chat-thinking-panel,
    .chat-thinking-body,
    .chat-thinking-content::after,
    .chat-thinking-panel.is-active::before,
    .chat-thinking-panel.is-active .chat-thinking-status-mark {
        animation: none !important;
    }
}

@media (max-width: 640px) {
    .chat-thinking-panel {
        --tp-radius: 12px;
    }
    .chat-thinking-body { max-height: 220px; }
    .chat-thinking-header { padding: 0.55rem 0.8rem; }
    .chat-thinking-body { padding: 0.5rem 0.8rem 0.8rem; }
    .chat-thinking-status-text { font-size: 0.66rem; }
}

/* -----------------------------------------------------------------------
   Chat-mode alignment with the text input box
   -----------------------------------------------------------------------
   In chat mode, the text input is fixed at:
     left: 50%; transform: translateX(-50%);
     width: calc(100% - 2rem); max-width: 728px;
   So its left edge sits at max(1rem, calc(50vw - 364px)).

   The panel is a flex item inside .chat-ai-body, which lives inside
   .chat-container (max-width: 800px, margin: 0 auto). So the body's
   left edge sits at:
     - For viewport >= 800px: (50vw - 400px) + 30px (avatar) + 12px (gap)
                            = 50vw - 358px
     - For viewport <  800px: 42px (container is full-width)

   We shift the panel with a margin-left so its left edge matches the
   text input's left edge at every viewport size. */
#chat-screen.chat-mode .chat-thinking-panel {
    /* Narrow viewports: container is full-width, so account for the
       42px avatar offset. */
    margin-left: max(calc(1rem - 42px), calc(50vw - 406px));
}

@media (min-width: 800px) {
    /* Wide viewports: container is capped at 800px and centered, so
       the panel just needs a small -6px nudge to line up with the
       text input (which is centered on the viewport, not the container). */
    #chat-screen.chat-mode .chat-thinking-panel {
        margin-left: -6px;
    }
}

:root[data-theme="light"] .chat-thinking-panel {
    --tp-surface: #f5f5f5;
    --tp-surface-2: #f5f5f5;
    --tp-border: transparent;
    --tp-border-soft: transparent;
    --tp-text: #111827;
    --tp-muted: #6B7280;
    --tp-faint: rgba(17, 24, 39, 0.55);
    --tp-accent: #333333;
    box-shadow: none;
}

:root[data-theme="light"] .chat-thinking-content {
    color: rgba(17, 24, 39, 0.85);
    font-style: normal;
}

:root[data-theme="light"] .chat-thinking-body::-webkit-scrollbar-thumb {
    background: rgba(15, 23, 42, 0.12);
}

:root[data-theme="light"] .chat-thinking-header:hover {
    background: rgba(15, 23, 42, 0.025);
}