:root {
    --chat-panel-width: 456px;
    --chat-panel-rail-width: 68px;
    --chat-panel-mobile-rail-width: 56px;
    --chat-panel-top-offset: 76px;
}

.app-body {
    overflow-x: hidden;
}

.app-content-shell {
    display: block;
    width: 100%;
}

.app-main {
    min-width: 0;
}

.chat-panel {
    --chat-panel-border: rgba(15, 23, 42, 0.08);
    --chat-panel-surface: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(248, 250, 252, 0.98));
    position: relative;
    z-index: 20;
    min-width: 0;
}

.chat-panel-rail {
    display: none;
}

.chat-panel-surface {
    background: var(--chat-panel-surface);
    border-left: 1px solid var(--chat-panel-border);
    box-shadow: -12px 0 32px rgba(15, 23, 42, 0.08);
    backdrop-filter: blur(14px);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.chat-panel-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: 1.1rem 1.25rem 0.9rem;
    border-bottom: 1px solid var(--chat-panel-border);
    gap: 0.75rem;
}

.chat-panel-kicker {
    margin: 0 0 0.25rem;
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.chat-panel-title-group {
    flex: 1 1 auto;
    min-width: 0;
}

.chat-panel-title-group h2 {
    margin: 0;
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.25;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

.chat-panel-actions {
    display: flex;
    gap: 0.35rem;
    flex: 0 0 auto;
    align-items: flex-start;
}

.chat-panel-action,
.chat-rail-button {
    border: 0;
    background: transparent;
    color: var(--text-secondary);
}

.chat-panel-action {
    width: 36px;
    height: 36px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.chat-panel-action i,
.chat-panel-action-glyph {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.chat-panel-action-glyph {
    font-size: 1.4rem;
    font-weight: 500;
    transform: translateX(0.5px);
}

.chat-panel-action-close {
    width: 40px;
    height: 40px;
    border: 1px solid rgba(15, 23, 42, 0.12);
    background: rgba(255, 255, 255, 0.92);
    color: #334155;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.06);
}

.chat-panel-action:hover,
.chat-rail-button:hover {
    background: rgba(255, 153, 0, 0.12);
    color: var(--primary-dark);
}

.chat-panel-scope {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    padding: 0.85rem 1.1rem 0;
}

.chat-scope-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.65rem;
    background: rgba(255, 153, 0, 0.12);
    color: var(--primary-dark);
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
}

.chat-scope-pill button {
    border: 0;
    background: transparent;
    color: inherit;
    padding: 0;
    line-height: 1;
}

.chat-panel-history {
    margin: 0.9rem 1.1rem 0;
    padding: 0.65rem;
    border: 1px solid var(--chat-panel-border);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.82);
}

.chat-history-item {
    width: 100%;
    text-align: left;
    border: 0;
    background: transparent;
    padding: 0.7rem 0.6rem;
    border-radius: 12px;
}

.chat-history-item:hover {
    background: rgba(255, 153, 0, 0.08);
}

.chat-history-item strong,
.chat-history-item span {
    display: block;
}

.chat-history-item span {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.chat-panel-body {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    padding: 1rem 1.1rem 1.2rem;
}

#chat-panel #chat-messages,
.chat-messages {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    padding: 0;
    min-height: 0;
    max-height: none;
    overflow: visible;
    background: transparent;
}

.chat-message {
    border-radius: 18px;
    padding: 0.9rem 1rem;
    max-width: 100%;
}

.chat-message-user {
    background: linear-gradient(135deg, rgba(255, 153, 0, 0.14), rgba(255, 153, 0, 0.24));
    align-self: flex-end;
}

.chat-message-ai {
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(15, 23, 42, 0.08);
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.04);
}

.chat-message-ai h1,
.chat-message-ai h2,
.chat-message-ai h3,
.chat-message-ai h4 {
    margin-top: 0;
    font-size: 0.96rem;
}

.chat-message-ai p:last-child {
    margin-bottom: 0;
}

.chat-progress-stream {
    margin-bottom: 0.9rem;
    border: 1px solid rgba(59, 130, 246, 0.18);
    background: rgba(59, 130, 246, 0.06);
    border-radius: 16px;
    padding: 0.8rem 0.95rem;
}

.chat-progress-title {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--info);
    margin-bottom: 0.55rem;
}

.chat-progress-step {
    display: flex;
    gap: 0.55rem;
    align-items: flex-start;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.chat-progress-step + .chat-progress-step {
    margin-top: 0.35rem;
}

.chat-progress-step.is-completed {
    color: var(--text);
}

.chat-progress-step.is-failed {
    color: var(--error);
}

.chat-evidence {
    margin-top: 1rem;
    display: grid;
    gap: 0.55rem;
    border-top: 1px solid rgba(15, 23, 42, 0.08);
    padding-top: 0.85rem;
}

.chat-evidence-title {
    margin: 0;
    font-size: 0.74rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.chat-evidence-card {
    border: 1px solid var(--chat-panel-border);
    background: rgba(255, 255, 255, 0.88);
    border-radius: 14px;
    padding: 0.7rem 0.8rem;
}

.chat-evidence-card h3 {
    font-size: 0.82rem;
    margin: 0;
}

.chat-evidence-meta {
    font-size: 0.74rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.chat-evidence-card p {
    display: none;
}

.chat-evidence-card a {
    font-size: 0.74rem;
    font-weight: 600;
}

.chat-panel-footer {
    border-top: 1px solid var(--chat-panel-border);
    padding: 0.7rem 0.9rem 0.85rem;
    background: rgba(255, 255, 255, 0.9);
    flex-shrink: 0;
}

.chat-panel-hint {
    margin-bottom: 0.45rem;
    font-size: 0.72rem;
    line-height: 1.35;
    color: var(--text-secondary);
}

#chat-panel #chat-form,
.chat-composer {
    display: block;
    padding: 0;
    gap: 0;
    border: 0;
    background: transparent;
}

#chat-panel #chat-input,
.chat-composer textarea {
    display: block;
    width: 100%;
    flex: none;
    resize: vertical;
    min-height: 68px;
    max-height: 180px;
    border: 1px solid rgba(15, 23, 42, 0.12);
    border-radius: 14px;
    padding: 0.72rem 0.85rem;
    font: inherit;
    font-size: 0.94rem;
    line-height: 1.4;
    color: #172033;
    background: rgba(248, 250, 252, 0.95);
}

#chat-panel #chat-input:focus,
.chat-composer textarea:focus {
    outline: none;
    border-color: rgba(255, 153, 0, 0.55);
    box-shadow: 0 0 0 4px rgba(255, 153, 0, 0.14);
}

#chat-panel #chat-form button {
    padding: 0.55rem 1.15rem;
    border-radius: 999px;
}

.chat-composer-actions {
    margin-top: 0.45rem;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 0.55rem;
}

.chat-rail-button {
    width: 100%;
    height: 100%;
    padding: 1rem 0.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.chat-rail-label {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-size: 0.72rem;
    font-weight: 700;
}

.chat-rail-indicator {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: transparent;
}

.chat-rail-indicator.has-activity {
    background: var(--primary);
    box-shadow: 0 0 0 6px rgba(255, 153, 0, 0.16);
}

.hidden {
    display: none !important;
}

@media (min-width: 1200px) {
    .app-content-shell {
        display: grid;
        grid-template-columns: minmax(0, 1fr) var(--chat-panel-width);
        align-items: stretch;
        min-height: calc(100vh - var(--chat-panel-top-offset));
    }

    .app-content-shell.chat-panel-collapsed {
        grid-template-columns: minmax(0, 1fr) var(--chat-panel-rail-width);
    }

    .chat-panel {
        position: sticky;
        top: var(--chat-panel-top-offset);
        height: calc(100vh - var(--chat-panel-top-offset));
        width: 100%;
        align-self: start;
    }

    .chat-panel.is-collapsed {
        width: var(--chat-panel-rail-width);
    }

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

    .chat-panel.is-collapsed .chat-panel-rail {
        display: flex;
        width: var(--chat-panel-rail-width);
        height: 100%;
        border-left: 1px solid var(--chat-panel-border);
        background: rgba(255, 255, 255, 0.94);
        box-shadow: -10px 0 26px rgba(15, 23, 42, 0.05);
    }

    .chat-panel:not(.is-collapsed) .chat-panel-rail {
        display: none;
    }
}

@media (max-width: 1199.98px) {
    .chat-panel {
        position: fixed;
        inset: 0 0 0 auto;
        width: min(92vw, 460px);
        transform: translateX(calc(100% - var(--chat-panel-rail-width)));
        transition: transform 180ms ease;
        height: 100vh;
    }

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

    .chat-panel-rail {
        display: flex;
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        width: var(--chat-panel-rail-width);
        background: rgba(255, 255, 255, 0.96);
        border-left: 1px solid var(--chat-panel-border);
        border-right: 1px solid var(--chat-panel-border);
    }

    .chat-panel-surface {
        margin-left: var(--chat-panel-rail-width);
        height: 100%;
    }
}

@media (max-width: 767.98px) {
    .chat-panel {
        width: 100vw;
        transform: translateX(100%);
    }

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

    .chat-panel-rail {
        width: var(--chat-panel-mobile-rail-width);
    }

    .chat-panel-surface {
        margin-left: 0;
        width: 100%;
    }

    .chat-panel.is-open .chat-panel-rail {
        display: none;
    }

    .chat-composer-actions {
        align-items: flex-start;
        flex-direction: column;
    }
}