:root {
    --bg-main: linear-gradient(135deg, #bcd0ea 0%, #cfd5ef 45%, #6da0ff 100%);
    --bg-surface: rgba(255, 255, 255, 0.88);
    --bg-surface-strong: rgba(255, 255, 255, 0.96);
    --bg-panel: rgba(255, 255, 255, 0.72);
    --text-main: #13233d;
    --text-soft: #5b6f8f;
    --border: rgba(120, 145, 190, 0.25);
    --shadow: 0 24px 60px rgba(31, 67, 135, 0.18);
    --primary-start: #1982ff;
    --primary-end: #ff2f54;
    --primary-soft: rgba(25, 130, 255, 0.12);
    --danger-soft: rgba(255, 47, 84, 0.12);
    --input-bg: rgba(255, 255, 255, 0.88);
    --sidebar-bg: rgba(255, 255, 255, 0.58);
    --message-user: linear-gradient(135deg, rgba(25, 130, 255, 0.16), rgba(255, 47, 84, 0.12));
    --message-assistant: rgba(255, 255, 255, 0.82);
    --badge-bg: rgba(25, 130, 255, 0.12);
    --badge-text: #176de0;
}

:root[data-theme="dark"] {
    --bg-main: linear-gradient(135deg, #0b1424 0%, #141f35 45%, #1d3f74 100%);
    --bg-surface: rgba(15, 23, 42, 0.88);
    --bg-surface-strong: rgba(15, 23, 42, 0.96);
    --bg-panel: rgba(15, 23, 42, 0.76);
    --text-main: #e8eefc;
    --text-soft: #9cb1d5;
    --border: rgba(148, 163, 184, 0.18);
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.38);
    --primary-start: #2a8cff;
    --primary-end: #ff476f;
    --primary-soft: rgba(42, 140, 255, 0.16);
    --danger-soft: rgba(255, 71, 111, 0.16);
    --input-bg: rgba(9, 15, 28, 0.82);
    --sidebar-bg: rgba(15, 23, 42, 0.62);
    --message-user: linear-gradient(135deg, rgba(42, 140, 255, 0.18), rgba(255, 71, 111, 0.16));
    --message-assistant: rgba(13, 20, 35, 0.86);
    --badge-bg: rgba(42, 140, 255, 0.14);
    --badge-text: #84b7ff;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg-main);
    color: var(--text-main);
}

body {
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
}

.layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 300px;
    background: var(--sidebar-bg);
    backdrop-filter: blur(18px);
    border-right: 1px solid var(--border);
    padding: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
}

.brand-logo {
    width: 54px;
    height: 54px;
    object-fit: contain;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.72);
    padding: 6px;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.4);
}

:root[data-theme="dark"] .brand-logo {
    background: rgba(255, 255, 255, 0.08);
}

.brand h1 {
    margin: 0;
    font-size: 19px;
    line-height: 1.2;
}

.brand p {
    margin: 4px 0 0;
    font-size: 13px;
    color: var(--text-soft);
}

.theme-switch {
    width: 100%;
    margin-bottom: 18px;
}

.theme-toggle {
    width: 100%;
    border: 1px solid var(--border);
    background: var(--bg-surface);
    color: var(--text-main);
    border-radius: 14px;
    padding: 12px 14px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    box-shadow: var(--shadow);
}

.nav {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.nav-link {
    display: block;
    padding: 13px 14px;
    border-radius: 14px;
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.28);
    border: 1px solid transparent;
}

.nav-link.active,
.nav-link:hover {
    background: var(--bg-surface);
    border-color: var(--border);
}

.content {
    flex: 1;
    padding: 28px;
}

.hero-card,
.panel,
.chat-sessions-panel,
.chat-main-panel {
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: 24px;
    box-shadow: var(--shadow);
}

.hero-card,
.panel {
    padding: 24px;
}

.hero-card h2 {
    margin-top: 12px;
    margin-bottom: 10px;
    font-size: 30px;
}

.hero-card p {
    color: var(--text-soft);
    line-height: 1.65;
}

.badge {
    display: inline-block;
    padding: 8px 12px;
    border-radius: 999px;
    background: var(--badge-bg);
    color: var(--badge-text);
    font-size: 12px;
    font-weight: 700;
}

.status-grid,
.info-grid {
    display: grid;
    gap: 16px;
    margin-top: 22px;
}

.status-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.info-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    margin-top: 24px;
}

.status-item {
    background: var(--bg-panel);
    border-radius: 18px;
    padding: 16px;
    border: 1px solid var(--border);
}

.status-label {
    display: block;
    font-size: 12px;
    color: var(--text-soft);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.ok {
    color: #159947;
}

.error {
    color: #e13b57;
}

.alert {
    margin-top: 18px;
    padding: 14px 16px;
    border-radius: 16px;
    font-size: 14px;
}

.alert-success {
    background: rgba(21, 153, 71, 0.12);
    color: #159947;
    border: 1px solid rgba(21, 153, 71, 0.16);
}

.alert-error {
    background: rgba(225, 59, 87, 0.12);
    color: #c92c46;
    border: 1px solid rgba(225, 59, 87, 0.16);
}

.action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 22px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 18px;
    border-radius: 14px;
    color: #ffffff;
    background: rgba(19, 35, 61, 0.78);
    border: 1px solid transparent;
    cursor: pointer;
    font-weight: 600;
}

.button.primary {
    background: linear-gradient(135deg, var(--primary-start), var(--primary-end));
}

.panel h3 {
    margin-top: 0;
    margin-bottom: 12px;
}

.panel ul {
    margin: 0;
    padding-left: 18px;
    color: var(--text-soft);
}

.panel li {
    margin-bottom: 8px;
}

.chat-layout {
    display: grid;
    grid-template-columns: 360px 1fr;
    gap: 24px;
}

.chat-sessions-panel,
.chat-main-panel {
    padding: 22px;
}

.panel-header {
    margin-bottom: 16px;
}

.panel-header h3 {
    margin: 0;
}

.new-chat-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.field-label {
    font-size: 13px;
    color: var(--text-soft);
}

.text-input,
.chat-textarea {
    width: 100%;
    border: 1px solid var(--border);
    background: var(--input-bg);
    color: var(--text-main);
    border-radius: 14px;
    padding: 13px 14px;
    font-size: 14px;
}

.text-input:focus,
.chat-textarea:focus {
    outline: none;
    border-color: rgba(25, 130, 255, 0.45);
    box-shadow: 0 0 0 4px rgba(25, 130, 255, 0.08);
}

.full-width {
    width: 100%;
}

.sessions-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.session-item {
    display: flex;
    gap: 10px;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-panel);
    border-radius: 16px;
    padding: 10px;
    border: 1px solid var(--border);
}

.session-open,
.session-delete {
    border: none;
    border-radius: 12px;
    padding: 10px 12px;
    cursor: pointer;
    font-size: 13px;
}

.session-open {
    flex: 1;
    text-align: left;
    background: var(--primary-soft);
    color: var(--text-main);
}

.session-delete {
    background: var(--danger-soft);
    color: #d72d4a;
}

.session-empty {
    color: var(--text-soft);
    font-size: 14px;
    padding: 12px 6px;
}

.chat-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding-bottom: 14px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.chat-messages {
    min-height: 380px;
    max-height: 560px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 8px 0 16px;
}

.message {
    display: flex;
}

.message.assistant {
    justify-content: flex-start;
}

.message.user {
    justify-content: flex-end;
}

.message-bubble {
    max-width: 78%;
    border-radius: 18px;
    padding: 14px 16px;
    line-height: 1.65;
    background: var(--message-assistant);
    border: 1px solid var(--border);
    color: var(--text-main);
}

.message.user .message-bubble {
    background: var(--message-user);
}

.chat-input-form {
    margin-top: 18px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.chat-actions {
    display: flex;
    justify-content: flex-end;
}

.logo-panel {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 18px;
    margin-bottom: 18px;
    border-radius: 22px;
    border: 1px solid var(--border);
    background: var(--bg-surface-strong);
}

.logo-panel img {
    max-width: 100%;
    width: 280px;
    height: auto;
    object-fit: contain;
}

.page-shell {
    width: 100%;
    max-width: 1480px;
    margin: 0 auto;
}

@media (max-width: 1100px) {
    .chat-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
    }

    .content {
        padding: 18px;
    }

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

    .message-bubble {
        max-width: 100%;
    }
}

.citations-box {
    margin-top: 14px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.citations-title {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-soft);
    margin-bottom: 8px;
    letter-spacing: 0.08em;
}

.citation-item {
    padding: 10px 12px;
    margin-bottom: 8px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border);
    font-size: 13px;
    line-height: 1.5;
}

.sources-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.source-item {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 16px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: var(--bg-panel);
}

.source-item-main {
    flex: 1;
}

.source-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 14px;
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-soft);
}

.source-actions {
    display: flex;
    align-items: center;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
    margin-bottom: 18px;
}

.source-delete-button {
    background: rgba(220, 38, 38, 0.14);
    color: #b91c1c;
}

.source-error {
    margin-top: 8px;
    padding: 10px 12px;
    border-radius: 12px;
    background: rgba(220, 38, 38, 0.08);
    border: 1px solid rgba(220, 38, 38, 0.16);
    color: #b91c1c;
    font-size: 13px;
}
.prompt-profiles {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.prompt-card {
    padding: 16px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: var(--bg-panel);
}

.prompt-textarea {
    min-height: 180px;
}

.chat-topbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.chat-status-bar {
    margin-bottom: 14px;
    padding: 12px 14px;
    border-radius: 14px;
    font-size: 14px;
    border: 1px solid var(--border);
}

.chat-status-active {
    background: rgba(25, 130, 255, 0.10);
    color: var(--text-main);
}

.chat-status-error {
    background: rgba(220, 38, 38, 0.10);
    color: #b91c1c;
    border-color: rgba(220, 38, 38, 0.20);
}

.stop-button {
    background: rgba(220, 38, 38, 0.14);
    color: #b91c1c;
}

.stop-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.button:disabled,
.theme-toggle:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

.export-button {
    background: rgba(25, 130, 255, 0.12);
    color: var(--text-main);
    border: 1px solid var(--border);
}

.export-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}



/* ===== Chat modern override: non-destructive patch ===== */

body.chat-page {
    overflow: hidden;
}

.chat-app-shell {
    display: grid;
    grid-template-columns: 310px minmax(0, 1fr);
    min-height: 100vh;
    background: var(--bg-main);
}

.chat-sidebar-modern {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 12px;
    background: var(--sidebar-bg);
    backdrop-filter: blur(18px);
    border-right: 1px solid var(--border);
    min-height: 100vh;
}

.chat-sidebar-top {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.chat-brand-modern {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 18px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    box-shadow: 0 10px 24px rgba(31, 67, 135, 0.10);
}

.chat-brand-logo {
    width: 44px;
    height: 44px;
    object-fit: contain;
    border-radius: 12px;
    background: rgba(255,255,255,.72);
    padding: 5px;
    flex: 0 0 auto;
}

.chat-brand-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.chat-brand-text strong {
    font-size: 14px;
    line-height: 1.2;
}

.chat-brand-text span {
    font-size: 11.5px;
    color: var(--text-soft);
    line-height: 1.3;
}

.chat-sidebar-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.theme-toggle.compact,
.compact-btn {
    min-height: 36px;
    padding: 8px 12px;
    border-radius: 12px;
    font-size: 12px;
}

.sidebar-link-logout {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    padding: 8px 12px;
    border-radius: 12px;
    font-size: 12px;
    color: #fff;
    background: linear-gradient(135deg, #ef4444, #fb7185);
    box-shadow: 0 10px 22px rgba(239, 68, 68, 0.18);
}

.chat-sidebar-section {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 12px;
    box-shadow: 0 10px 24px rgba(31, 67, 135, 0.10);
}

.chat-sidebar-section.grow {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.sidebar-section-title {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--text-soft);
    margin-bottom: 10px;
}

.sidebar-new-chat-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.field-label.compact {
    font-size: 12px;
}

.text-input.compact {
    padding: 10px 12px;
    border-radius: 12px;
    font-size: 12.5px;
}

.sessions-list.modern {
    display: flex;
    flex-direction: column;
    gap: 8px;
    overflow-y: auto;
    min-height: 0;
    padding-right: 2px;
}

.session-item.modern {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 8px;
    padding: 10px;
    border-radius: 14px;
    background: var(--bg-panel);
    border: 1px solid var(--border);
}

.session-left {
    flex: 1;
    min-width: 0;
}

.session-open.modern {
    width: 100%;
    border: none;
    background: transparent;
    color: var(--text-main);
    text-align: left;
    font-size: 12.5px;
    font-weight: 600;
    padding: 0;
    cursor: pointer;
}

.session-open.modern:hover {
    color: var(--primary-start);
}

.session-meta {
    margin-top: 4px;
    font-size: 10.5px;
    color: var(--text-soft);
    text-transform: uppercase;
    letter-spacing: .08em;
}

.session-delete.modern {
    border: none;
    border-radius: 10px;
    padding: 7px 10px;
    cursor: pointer;
    font-size: 11px;
    background: rgba(220, 38, 38, 0.12);
    color: #b91c1c;
}

.chat-sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-nav-link {
    display: block;
    padding: 10px 12px;
    border-radius: 12px;
    font-size: 12.5px;
    background: rgba(255,255,255,.28);
    border: 1px solid transparent;
}

.sidebar-nav-link.active,
.sidebar-nav-link:hover {
    background: var(--bg-surface);
    border-color: var(--border);
}

.chat-main-modern {
    min-width: 0;
    min-height: 100vh;
    display: grid;
    grid-template-rows: auto auto 1fr auto;
    gap: 12px;
    padding: 12px;
}

.chat-header-modern {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px;
    border-radius: 18px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    box-shadow: 0 10px 24px rgba(31, 67, 135, 0.10);
}

.chat-header-title {
    min-width: 0;
}

.chat-header-label {
    font-size: 10.5px;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--text-soft);
    margin-bottom: 4px;
}

.chat-header-title h1 {
    margin: 0;
    font-size: 16px;
    line-height: 1.25;
    word-break: break-word;
}

.chat-header-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.chat-user-chip {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 7px 11px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--primary-soft);
    color: var(--text-main);
    font-size: 12px;
}

.chat-status-bar.modern {
    margin: 0;
    padding: 10px 12px;
    border-radius: 14px;
    font-size: 12.5px;
}

.chat-messages-modern-wrap {
    min-height: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: 0 10px 24px rgba(31, 67, 135, 0.10);
    overflow: hidden;
}

.chat-messages.modern {
    flex: 1;
    min-height: 0;
    max-height: none;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 16px;
}

.message.modern {
    display: flex;
}

.message.modern.assistant {
    justify-content: flex-start;
}

.message.modern.user {
    justify-content: flex-end;
}

.message-bubble.modern {
    max-width: min(760px, 82%);
    border-radius: 18px;
    padding: 12px 14px;
    line-height: 1.55;
    font-size: 13px;
    background: var(--message-assistant);
    border: 1px solid var(--border);
    color: var(--text-main);
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.05);
}

.message.modern.user .message-bubble.modern {
    background: var(--message-user);
}

.citations-box.compact {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}

.citation-item.compact {
    margin-bottom: 6px;
    padding: 8px 10px;
    font-size: 11.5px;
    line-height: 1.45;
}

.chat-input-footer {
    position: sticky;
    bottom: 0;
    z-index: 4;
}

.chat-input-form.modern {
    margin: 0;
}

.chat-input-box {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    padding: 12px;
    border-radius: 18px;
    background: var(--bg-surface-strong);
    border: 1px solid var(--border);
    box-shadow: 0 10px 24px rgba(31, 67, 135, 0.10);
}

.chat-textarea.modern {
    min-height: 46px;
    max-height: 160px;
    resize: none;
    border-radius: 14px;
    padding: 12px 14px;
    font-size: 13px;
    line-height: 1.45;
}

.chat-footer-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

@media (max-width: 1100px) {
    .chat-app-shell {
        grid-template-columns: 280px minmax(0, 1fr);
    }
}

@media (max-width: 860px) {
    body.chat-page {
        overflow: auto;
    }

    .chat-app-shell {
        grid-template-columns: 1fr;
        min-height: auto;
    }

    .chat-sidebar-modern {
        min-height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .chat-main-modern {
        min-height: auto;
    }
}

@media (max-width: 640px) {
    .chat-sidebar-modern,
    .chat-main-modern {
        padding: 10px;
    }

    .chat-header-modern {
        flex-direction: column;
        align-items: flex-start;
        padding: 12px;
    }

    .chat-header-right {
        width: 100%;
        justify-content: flex-start;
    }

    .chat-messages.modern {
        padding: 12px;
    }

    .message-bubble.modern {
        max-width: 100%;
        font-size: 12.5px;
        padding: 11px 12px;
    }

    .chat-input-box {
        flex-direction: column;
        align-items: stretch;
    }

    .chat-footer-actions {
        justify-content: flex-end;
    }
}

/* ===== End chat modern override ===== */