/* ============================================================================
   Echelix — eProjectGPT
   Modern redesign · warm-neutral slate + teal accent
   Light by default · dark via OS setting (prefers-color-scheme) AND a manual
   toggle (html[data-theme="light"|"dark"]). The toggle always wins; with no
   toggle set, the OS preference is followed.
   ============================================================================ */

/* ── Design tokens ───────────────────────────────────────────────────────── */
:root {
    color-scheme: light;

    --sans: 'Figtree', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

    /* surfaces */
    --bg: #f5f6f7;
    --rail: #f0f2f3;
    --rail-border: #e4e7e9;
    --surface: #ffffff;
    --surface-2: #f1f3f5;
    --surface-3: #e9ecef;
    --border: #e3e6e9;
    --border-soft: #eceef1;

    /* text */
    --text: #1b1f24;
    --text-2: #5a626c;
    --text-3: #8b929b;

    /* accent (teal) */
    --accent: #0d9488;
    --accent-hover: #0f766e;
    --accent-soft: rgba(13, 148, 136, 0.10);
    --accent-soft-2: rgba(13, 148, 136, 0.16);
    --accent-contrast: #ffffff;

    /* chat user bubble */
    --user-bg: rgba(13, 148, 136, 0.12);
    --user-text: #134e48;

    /* status */
    --danger: #dc2626;   --danger-soft: rgba(220, 38, 38, 0.10);
    --success: #0f9d6c;  --success-soft: rgba(15, 157, 108, 0.12);
    --warning: #c2710c;  --warning-soft: rgba(194, 113, 12, 0.12);
    --info: #0d9488;     --info-soft: rgba(13, 148, 136, 0.10);

    /* effects */
    --shadow: rgba(16, 24, 40, 0.06);
    --shadow-md: rgba(16, 24, 40, 0.10);
    --shadow-lg: rgba(16, 24, 40, 0.16);

    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
}

/* dark tokens — shared block applied to OS-dark (unless forced light) and forced dark */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        color-scheme: dark;
        --bg: #0f1316;
        --rail: #13181b;
        --rail-border: #222a2f;
        --surface: #171c20;
        --surface-2: #1d242a;
        --surface-3: #232b31;
        --border: #262f35;
        --border-soft: #1f272c;
        --text: #e6e9ec;
        --text-2: #9aa3ac;
        --text-3: #6f7882;
        --accent: #2dd4bf;
        --accent-hover: #5eead4;
        --accent-soft: rgba(45, 212, 191, 0.14);
        --accent-soft-2: rgba(45, 212, 191, 0.20);
        --accent-contrast: #04211d;
        --user-bg: rgba(45, 212, 191, 0.16);
        --user-text: #d7faf3;
        --danger: #f87171;   --danger-soft: rgba(248, 113, 113, 0.14);
        --success: #34d399;  --success-soft: rgba(52, 211, 153, 0.14);
        --warning: #fbbf24;  --warning-soft: rgba(251, 191, 36, 0.14);
        --info: #2dd4bf;     --info-soft: rgba(45, 212, 191, 0.14);
        --shadow: rgba(0, 0, 0, 0.40);
        --shadow-md: rgba(0, 0, 0, 0.50);
        --shadow-lg: rgba(0, 0, 0, 0.60);
    }
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0f1316;
    --rail: #13181b;
    --rail-border: #222a2f;
    --surface: #171c20;
    --surface-2: #1d242a;
    --surface-3: #232b31;
    --border: #262f35;
    --border-soft: #1f272c;
    --text: #e6e9ec;
    --text-2: #9aa3ac;
    --text-3: #6f7882;
    --accent: #2dd4bf;
    --accent-hover: #5eead4;
    --accent-soft: rgba(45, 212, 191, 0.14);
    --accent-soft-2: rgba(45, 212, 191, 0.20);
    --accent-contrast: #04211d;
    --user-bg: rgba(45, 212, 191, 0.16);
    --user-text: #d7faf3;
    --danger: #f87171;   --danger-soft: rgba(248, 113, 113, 0.14);
    --success: #34d399;  --success-soft: rgba(52, 211, 153, 0.14);
    --warning: #fbbf24;  --warning-soft: rgba(251, 191, 36, 0.14);
    --info: #2dd4bf;     --info-soft: rgba(45, 212, 191, 0.14);
    --shadow: rgba(0, 0, 0, 0.40);
    --shadow-md: rgba(0, 0, 0, 0.50);
    --shadow-lg: rgba(0, 0, 0, 0.60);
}

/* ── Reset ───────────────────────────────────────────────────────────────── */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection { background: var(--accent-soft-2); }

/* ── Scrollbars ──────────────────────────────────────────────────────────── */
* { scrollbar-width: thin; scrollbar-color: var(--surface-3) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--surface-3); border-radius: 6px; border: 2px solid transparent; background-clip: padding-box; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); background-clip: padding-box; }

/* ============================================================================
   Top navbar (used by document-management.html; the chat app folds it into
   the sidebar instead)
   ============================================================================ */
.navbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}
.nav-container { display: flex; align-items: center; padding: 12px 24px; width: 100%; gap: 8px; }
.nav-brand {
    color: var(--text);
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-right: 16px;
    text-decoration: none;
    white-space: nowrap;
    flex-shrink: 0;
}
.nav-brand:hover { color: var(--accent); }
.nav-links { display: flex; list-style: none; gap: 4px; flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
.nav-links::-webkit-scrollbar { display: none; }
.nav-link {
    color: var(--text-2);
    text-decoration: none;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    transition: all 0.18s ease;
    font-weight: 500;
    font-size: 13px;
    white-space: nowrap;
}
.nav-link:hover { color: var(--text); background: var(--surface-2); }
.nav-link.active { color: var(--accent); background: var(--accent-soft); }

/* ── Container / sections (test-suite pages) ─────────────────────────────── */
.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 28px 24px; }

.config-section,
.section {
    display: none;
    background: var(--surface);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: 0 1px 2px var(--shadow);
    border: 1px solid var(--border);
    margin-bottom: 24px;
}
.config-section { display: block; }
.section.active { display: block; animation: sectionFadeIn 0.3s ease-out; }
@keyframes sectionFadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.section h2 {
    color: var(--text);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.sub-tabs { display: flex; gap: 0; margin-bottom: 24px; border-bottom: 1px solid var(--border); }
.sub-tab {
    padding: 12px 22px; background: transparent; border: none; border-bottom: 2px solid transparent;
    cursor: pointer; font-size: 14px; font-weight: 600; color: var(--text-3);
    transition: all 0.18s ease; margin-bottom: -1px; font-family: inherit;
}
.sub-tab:hover { color: var(--text-2); }
.sub-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-content { display: none; padding-top: 18px; }
.tab-content.active { display: block; }
.tabbed-section { padding: 0; background: transparent; box-shadow: none; border: none; }
.tabbed-section .sub-tabs { background: var(--surface); border-radius: var(--radius) var(--radius) 0 0; padding: 0 18px; border: 1px solid var(--border); border-bottom: none; }
.tabbed-section .tab-content { background: var(--surface); padding: 22px; border-radius: 0 0 var(--radius) var(--radius); border: 1px solid var(--border); border-top: none; }

.api-group {
    background: var(--surface);
    padding: 24px;
    margin-bottom: 20px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}
.api-group h3 { color: var(--text); margin-bottom: 16px; font-size: 17px; font-weight: 600; }
.api-group p { color: var(--text-2); margin-bottom: 18px; font-size: 14px; }

/* ── Forms ───────────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 8px; color: var(--text); font-size: 13.5px; }

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 11px 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: inherit;
    color: var(--text);
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
.form-group select { width: auto; min-width: 200px; max-width: 100%; cursor: pointer; }
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-3); }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-group textarea { min-height: 120px; resize: vertical; font-family: var(--mono); }
.form-group small { display: block; margin-top: 7px; color: var(--text-3); font-size: 12px; }

/* select chevron */
.form-group select,
select:not(.form-group select) {
    appearance: none; -webkit-appearance: none; -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%238b929b' stroke-width='2.4' stroke-linecap='round'%3E%3Cpath d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}
select:not(.form-group select) {
    background-color: var(--surface);
    padding: 9px 34px 9px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
select:not(.form-group select):focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.form-group select option,
select option { background-color: var(--surface); color: var(--text); }

input[type="file"] { cursor: pointer; }
input[type="checkbox"] { accent-color: var(--accent); }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    text-align: center;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.18s ease, border-color 0.18s ease, transform 0.05s ease;
    margin-right: 10px;
    margin-bottom: 10px;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn.primary { background: var(--accent); color: var(--accent-contrast); }
.btn.primary:hover:not(:disabled) { background: var(--accent-hover); }

.btn.secondary { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn.secondary:hover:not(:disabled) { background: var(--surface-2); border-color: var(--text-3); }

.btn.danger { background: var(--danger); color: #fff; }
.btn.danger:hover:not(:disabled) { filter: brightness(0.94); }

.btn.warning { background: var(--warning); color: #fff; }
.btn.warning:hover:not(:disabled) { filter: brightness(0.94); }

.btn.small { padding: 7px 13px; font-size: 13px; margin: 0; }

/* ── Status banners ──────────────────────────────────────────────────────── */
.status { padding: 14px 18px; margin: 18px 0; border-radius: var(--radius-sm); font-weight: 500; display: none; border: 1px solid; font-size: 14px; }
.status.info { background: var(--info-soft); color: var(--accent-hover); border-color: var(--accent-soft-2); display: block; }
.status.success { background: var(--success-soft); color: var(--success); border-color: var(--success-soft); display: block; }
.status.error { background: var(--danger-soft); color: var(--danger); border-color: var(--danger-soft); display: block; }
.status.warning { background: var(--warning-soft); color: var(--warning); border-color: var(--warning-soft); display: block; }

/* ── Output panes (test-suite) ───────────────────────────────────────────── */
.output-container { background: var(--surface); padding: 22px; border-radius: var(--radius); box-shadow: 0 1px 2px var(--shadow); border: 1px solid var(--border); }
.output-container h3 { color: var(--text); margin-bottom: 16px; font-size: 17px; }
.output-header { display: flex; gap: 10px; margin-bottom: 16px; justify-content: flex-end; }
.output, textarea.output {
    background: var(--surface-2);
    color: var(--text);
    padding: 18px;
    border-radius: var(--radius-sm);
    font-family: var(--mono);
    font-size: 13px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    max-height: 500px;
    overflow-y: auto;
    border: 1px solid var(--border);
}
textarea.output { resize: vertical; }
.output:empty::before { content: 'No output yet…'; color: var(--text-3); font-style: italic; }
.output:focus, textarea.output:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

/* ── Misc test-suite bits (kept themed for safety) ───────────────────────── */
.auth-message { background: var(--accent-soft); padding: 16px; border-radius: var(--radius-sm); border-left: 3px solid var(--accent); color: var(--text-2); }
.auth-message.success { background: var(--success-soft); border-left-color: var(--success); color: var(--success); }
.auth-message.error { background: var(--danger-soft); border-left-color: var(--danger); color: var(--danger); }
.auth-message.info { background: var(--info-soft); border-left-color: var(--accent); color: var(--text-2); }
.auth-message code, .guid-display { font-family: var(--mono); font-size: 0.9em; color: var(--accent-hover); }
.guid-display { background: var(--surface-2); padding: 10px 14px; border-radius: var(--radius-sm); border: 1px solid var(--border); margin-top: 8px; font-size: 13px; }

.button-group { display: flex; gap: 10px; flex-wrap: wrap; }
.search-input { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 11px 14px; font-size: 14px; color: var(--text); }
.search-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); outline: none; }
.search-input::placeholder { color: var(--text-3); }

.text-center { text-align: center; }
.text-muted { color: var(--text-3); }
.mt-1{margin-top:.25rem}.mt-2{margin-top:.5rem}.mt-3{margin-top:1rem}.mt-4{margin-top:1.5rem}.mt-5{margin-top:3rem}
.mb-1{margin-bottom:.25rem}.mb-2{margin-bottom:.5rem}.mb-3{margin-bottom:1rem}.mb-4{margin-bottom:1.5rem}.mb-5{margin-bottom:3rem}

.json-key { color: var(--accent-hover); }
.json-string { color: var(--warning); }
.json-number { color: #8b5cf6; }
.json-boolean { color: #db2777; }
.json-null { color: var(--text-3); }

/* ============================================================================
   APP LAYOUT — chat (single left rail + main)
   ============================================================================ */
.app-layout { display: flex; height: 100vh; overflow: hidden; }

/* ── Left rail ───────────────────────────────────────────────────────────── */
.chat-sidebar {
    width: 264px;
    min-width: 240px;
    background: var(--rail);
    border-right: 1px solid var(--rail-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    flex-shrink: 0;
}

/* Brand block at the very top of the rail */
.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 14px 12px;
}
.sidebar-brand-logo {
    width: 32px; height: 32px; border-radius: 9px;
    background: var(--surface); border: 1px solid var(--border);
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.sidebar-brand-logo img { width: 19px; height: 19px; object-fit: contain; }
.sidebar-brand-logo .logo-light { display: block; }
.sidebar-brand-logo .logo-dark { display: none; }
.sidebar-brand-text { font-size: 15px; font-weight: 700; letter-spacing: -0.015em; line-height: 1.15; color: var(--text); }
.sidebar-brand .btn-collapse-sidebar { margin-left: auto; }

.sidebar-header { padding: 4px 12px 10px; border-bottom: 1px solid var(--rail-border); }
.sidebar-header-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.sidebar-title { font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-3); font-weight: 600; }

.btn-collapse-sidebar,
.btn-expand-sidebar {
    background: none; border: 1px solid var(--border); color: var(--text-2);
    width: 28px; height: 28px; border-radius: 7px; cursor: pointer;
    font-size: 15px; line-height: 1; display: flex; align-items: center; justify-content: center;
    flex-shrink: 0; transition: all 0.18s;
}
.btn-collapse-sidebar:hover,
.btn-expand-sidebar:hover { border-color: var(--accent); color: var(--text); }
.btn-expand-sidebar { display: none; }

@media (min-width: 769px) {
    .chat-sidebar { transition: width 0.2s ease, min-width 0.2s ease, opacity 0.2s ease; }
    .app-layout.sidebar-collapsed .chat-sidebar { width: 0; min-width: 0; opacity: 0; border-right: none; pointer-events: none; }
    .app-layout.sidebar-collapsed .btn-expand-sidebar { display: flex; }
}

.btn-new-chat {
    width: 100%; display: flex; align-items: center; justify-content: center; gap: 7px;
    padding: 10px 12px; background: var(--accent); color: var(--accent-contrast);
    border: none; border-radius: 10px; cursor: pointer; font-size: 13.5px; font-weight: 600;
    font-family: inherit; transition: background 0.18s; box-shadow: 0 1px 2px var(--shadow);
}
.btn-new-chat:hover { background: var(--accent-hover); }
.btn-new-chat::before { content: "+"; font-size: 16px; font-weight: 500; line-height: 0; }

.btn-search-history {
    width: 100%; margin-top: 6px; padding: 8px 10px; background: transparent;
    color: var(--text-2); border: none; border-radius: var(--radius-sm); cursor: pointer;
    font-size: 13px; font-weight: 500; display: flex; align-items: center; justify-content: flex-start;
    gap: 9px; transition: background 0.18s; font-family: inherit;
}
.btn-search-history:hover { background: var(--surface-2); color: var(--text); }
.btn-search-history .sh-icon { font-size: 13px; opacity: 0.85; }

/* ── Conversation list (soft, not boxy) ──────────────────────────────────── */
.conversation-list { flex: 1; overflow-y: auto; padding: 8px; }
.conv-empty { color: var(--text-3); font-size: 13px; text-align: center; padding: 20px 8px; }

.conv-item {
    position: relative; padding: 9px 11px; border-radius: 10px; cursor: pointer;
    margin-bottom: 2px; transition: background 0.15s;
}
.conv-item:hover { background: var(--surface-2); }
.conv-item.active { background: var(--accent-soft); }   /* no hard left border — softer */

.conv-title { font-size: 13px; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-right: 20px; }
.conv-item:not(.active) .conv-title { font-weight: 500; color: var(--text-2); }
.conv-item.active .conv-title { font-weight: 600; color: var(--text); }
.conv-meta { font-size: 11px; color: var(--text-3); margin-top: 2px; display: flex; align-items: baseline; gap: 8px; }
.conv-meta-loc { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.conv-date { margin-left: auto; flex-shrink: 0; color: var(--text-3); white-space: nowrap; }

.conv-delete {
    position: absolute; top: 7px; right: 7px; background: none; border: none;
    color: var(--text-3); cursor: pointer; font-size: 12px; padding: 2px 5px; border-radius: 5px; display: none;
}
.conv-item:hover .conv-delete { display: block; }
.conv-delete:hover { color: var(--danger); background: var(--surface-3); }

.conv-title[contenteditable="true"],
.conv-title.editing { outline: none; background: var(--surface-3); border-radius: 5px; padding: 1px 4px; cursor: text; caret-color: var(--accent); white-space: nowrap; overflow: hidden; }

/* ── Rail footer: user + theme + settings ────────────────────────────────── */
.sidebar-footer {
    border-top: 1px solid var(--rail-border);
    padding: 10px 12px;
    display: flex;
    align-items: center;
    gap: 9px;
}
.user-avatar {
    width: 30px; height: 30px; border-radius: 50%;
    background: var(--accent); color: var(--accent-contrast);
    display: flex; align-items: center; justify-content: center;
    font-size: 12px; font-weight: 700; flex-shrink: 0; text-transform: uppercase;
}
.user-menu { display: flex; align-items: center; gap: 9px; min-width: 0; flex: 1; }
.user-menu #userName { font-size: 12.5px; font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.icon-btn {
    width: 30px; height: 30px; border-radius: var(--radius-sm); background: transparent;
    border: 1px solid var(--border); color: var(--text-2);
    display: flex; align-items: center; justify-content: center; cursor: pointer; flex-shrink: 0;
    transition: all 0.18s; font-family: inherit;
}
.icon-btn:hover { border-color: var(--accent); color: var(--text); }
.icon-btn svg { display: block; }

/* sign-out as a quiet text button inside the user menu */
.user-menu .btn {
    margin: 0; padding: 5px 10px; font-size: 12px; border-radius: 7px;
    background: transparent; border: 1px solid var(--border); color: var(--text-2);
}
.user-menu .btn:hover { border-color: var(--accent); color: var(--text); background: transparent; }

/* dev badge */
.dev-badge {
    display: inline-flex; align-items: center; background: var(--warning); color: #fff;
    font-size: 10px; font-weight: 800; letter-spacing: 0.08em; padding: 2px 7px; border-radius: 5px;
}

/* ── Main chat column ────────────────────────────────────────────────────── */
.chat-main { flex: 1; display: flex; flex-direction: column; overflow: hidden; background: var(--bg); min-width: 0; }

/* Context bar (relocated, cleaner filters) */
.chat-header {
    display: flex; align-items: center; gap: 8px;
    padding: 11px 18px;
    border-bottom: 1px solid var(--border-soft);
    background: var(--bg);
    flex-shrink: 0;
}

.chat-filters { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.filter-group {
    display: flex; align-items: center; gap: 7px;
    padding: 5px 6px 5px 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 9px;
    transition: border-color 0.18s;
}
.filter-group:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.filter-group label { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-3); white-space: nowrap; }
.filter-group select {
    background: transparent; border: none; color: var(--text); font-weight: 600;
    border-radius: 6px; padding: 2px 24px 2px 4px; font-size: 13px; min-width: 96px; cursor: pointer;
    font-family: inherit;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%238b929b' stroke-width='2.4' stroke-linecap='round'%3E%3Cpath d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right 6px center;
    appearance: none; -webkit-appearance: none; -moz-appearance: none;
}
.filter-group select:focus { outline: none; }

.btn-settings, .btn-sidebar-toggle {
    background: none; border: 1px solid var(--border); color: var(--text-2);
    width: 34px; height: 34px; border-radius: var(--radius-sm); cursor: pointer; font-size: 16px;
    display: flex; align-items: center; justify-content: center; flex-shrink: 0; transition: all 0.18s;
}
.btn-settings:hover, .btn-sidebar-toggle:hover { border-color: var(--accent); color: var(--text); }
.btn-sidebar-toggle { display: none; }

/* required-filter validation */
.invalid-field { border-color: var(--danger) !important; box-shadow: 0 0 0 2px var(--danger-soft) !important; }
.filter-group.invalid-field, .filter-group:has(.invalid-field) { border-color: var(--danger); }
.filter-warning {
    display: none; margin: 0 18px 10px; padding: 9px 13px; font-size: 13px;
    color: var(--danger); background: var(--danger-soft);
    border: 1px solid var(--danger-soft); border-radius: var(--radius-sm);
}

/* ── Thread ──────────────────────────────────────────────────────────────── */
.chat-thread {
    flex: 1; overflow-y: auto;
    padding: 20px max(24px, (100% - 768px) / 2) 8px;
    display: flex; flex-direction: column; gap: 22px;
}
.chat-thread > .chat-empty { margin-left: auto; margin-right: auto; }

/* Empty state */
.chat-empty {
    display: flex; flex-direction: column; align-items: center; justify-content: flex-start;
    flex: 1; color: var(--text-2); text-align: center; padding: 78px 24px 40px;
    max-width: 680px; margin: 0 auto;
}
.chat-empty-icon {
    width: 52px; height: 52px; border-radius: 15px; margin-bottom: 22px;
    background: var(--surface); border: 1px solid var(--border);
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 2px 8px var(--shadow); font-size: 26px;
}
.chat-empty-icon img { width: 30px; height: 30px; object-fit: contain; }
.chat-empty-icon .logo-light { display: block; }
.chat-empty-icon .logo-dark { display: none; }
.chat-empty h1 { font-size: 26px; font-weight: 700; letter-spacing: -0.02em; margin: 0 0 8px; color: var(--text); }
.chat-empty p.chat-empty-sub { font-size: 15px; color: var(--text-2); margin: 0 0 30px; line-height: 1.55; max-width: 460px; }

.suggestion-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; width: 100%; max-width: 560px; }
.suggestion-card {
    text-align: left; padding: 15px 16px; background: var(--surface);
    border: 1px solid var(--border); border-radius: 14px; cursor: pointer;
    box-shadow: 0 1px 2px var(--shadow); transition: border-color 0.18s, transform 0.05s;
}
.suggestion-card:hover { border-color: var(--accent); }
.suggestion-card:active { transform: translateY(1px); }
.suggestion-card .sc-title { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; color: var(--text); }
.suggestion-card .sc-title svg { color: var(--accent); flex-shrink: 0; }
.suggestion-card .sc-desc { font-size: 12.5px; color: var(--text-3); margin-top: 5px; line-height: 1.45; }

/* ── Chat bubbles ────────────────────────────────────────────────────────── */
.chat-bubble { display: flex; flex-direction: column; gap: 3px; }
.chat-bubble.user { align-self: flex-end; align-items: flex-end; max-width: 78%; }
.chat-bubble.assistant { align-self: stretch; align-items: stretch; max-width: 100%; }

.bubble-content { font-size: 14.5px; line-height: 1.62; word-break: break-word; }

/* user = soft tinted bubble (rounded, friendly) */
.chat-bubble.user .bubble-content {
    background: var(--user-bg); color: var(--user-text);
    padding: 11px 15px; border-radius: 16px; border-bottom-right-radius: 5px;
}

/* assistant = borderless, sits on the page with an avatar mark */
.chat-bubble.assistant .bubble-content {
    position: relative; background: transparent; color: var(--text);
    padding: 2px 0 2px 40px;
}
.chat-bubble.assistant .bubble-content::before {
    content: "E";
    position: absolute; left: 0; top: 0;
    width: 28px; height: 28px; border-radius: 8px;
    background: var(--accent); color: var(--accent-contrast);
    display: flex; align-items: center; justify-content: center;
    font-size: 13px; font-weight: 800; font-family: var(--sans);
}

.bubble-content h3, .bubble-content h4, .bubble-content h5 { margin: 14px 0 6px; color: var(--text); font-weight: 700; }
.bubble-content h3 { font-size: 1.18em; }
.bubble-content h4 { font-size: 1.08em; }
.bubble-content strong { color: var(--text); font-weight: 700; }
.chat-bubble.user .bubble-content strong { color: var(--user-text); }
.bubble-content em { font-style: italic; }
.bubble-content a { color: var(--accent); text-decoration: none; }
.bubble-content a:hover { text-decoration: underline; }
.bubble-content code { background: var(--surface-2); padding: 2px 6px; border-radius: 5px; font-family: var(--mono); font-size: 0.86em; color: var(--text); }
.chat-bubble.user .bubble-content code { background: rgba(0,0,0,0.10); }
.bubble-content pre { background: var(--surface-2); border: 1px solid var(--border); padding: 12px 14px; border-radius: 10px; overflow-x: auto; margin: 10px 0; }
.bubble-content pre code { background: none; padding: 0; }
.bubble-content p { margin: 8px 0; }
.bubble-content p:first-child { margin-top: 0; }
.bubble-content p:last-child { margin-bottom: 0; }
.bubble-content ul, .bubble-content ol { padding-left: 20px; margin: 8px 0; }
.bubble-content li { margin: 4px 0; color: var(--text-2); }
.bubble-content li strong { color: var(--text); }
.bubble-content hr { border: none; border-top: 1px solid var(--border); margin: 14px 0; }

.bubble-status { font-size: 12px; color: var(--text-3); padding: 2px 0 2px 40px; }
.chat-bubble.user .bubble-status { padding: 2px 0; }
.search-hint { font-size: 11px; color: var(--text-3); font-style: italic; padding: 2px 4px; }

/* bubble meta (time + copy) */
.bubble-meta { display: flex; align-items: center; gap: 8px; padding: 1px 0 1px 40px; min-height: 18px; }
.chat-bubble.user .bubble-meta { flex-direction: row-reverse; padding: 1px 4px; }
.bubble-time { font-size: 11px; color: var(--text-3); white-space: nowrap; }
.bubble-copy {
    display: inline-flex; align-items: center; gap: 4px; background: none; border: none;
    color: var(--text-3); cursor: pointer; font-size: 11px; line-height: 1; padding: 2px 5px;
    border-radius: 5px; opacity: 0; transition: opacity 0.15s, color 0.15s, background 0.15s; font-family: inherit;
}
.chat-bubble:hover .bubble-copy, .bubble-copy:focus-visible { opacity: 1; }
.bubble-copy:hover { color: var(--text); background: var(--surface-2); }
.bubble-copy .copy-icon { font-size: 13px; }
.bubble-copy.copied { color: var(--success); opacity: 1; }
@media (hover: none) { .bubble-copy { opacity: 0.7; } }

/* ── Sources ─────────────────────────────────────────────────────────────── */
.sources-panel { margin-top: 10px; width: 100%; padding-left: 40px; }
.chat-bubble.user .sources-panel { padding-left: 0; }
.sources-toggle {
    background: var(--surface); border: 1px solid var(--border); color: var(--text-2);
    padding: 5px 12px; border-radius: 20px; cursor: pointer; font-size: 12px; font-weight: 500;
    transition: all 0.18s; font-family: inherit;
}
.sources-toggle:hover { border-color: var(--accent); color: var(--text); }
.sources-body { display: none; margin-top: 8px; padding: 4px; background: transparent; border: none; font-size: 13px; display: none; flex-direction: column; gap: 7px; }
.sources-panel.open .sources-body { display: flex; }
.sources-panel.open .sources-toggle { color: var(--text); border-color: var(--accent); }
.source-row {
    display: flex; align-items: center; gap: 10px; padding: 9px 11px; flex-wrap: wrap;
    background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
}
.source-row a { color: var(--text); font-weight: 500; text-decoration: none; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.source-row a:hover { color: var(--accent); }

/* document sources table (alt rendering) */
.document-sources { margin-top: 20px; background: var(--surface); border-radius: var(--radius); padding: 18px; border: 1px solid var(--border); }
.document-sources h4 { color: var(--text); margin: 0 0 14px; font-size: 15px; font-weight: 600; }
#sourcesTable { width: 100%; border-collapse: collapse; }
#sourcesTable thead th { text-align: left; padding: 9px 12px; color: var(--text-3); font-weight: 600; font-size: 11px; text-transform: uppercase; letter-spacing: 0.04em; border-bottom: 1px solid var(--border); }
#sourcesTable tbody tr { transition: background 0.15s; }
#sourcesTable tbody tr:hover { background: var(--surface-2); }
#sourcesTable tbody td { padding: 11px 12px; border-bottom: 1px solid var(--border-soft); vertical-align: middle; }
#sourcesTable tbody tr:last-child td { border-bottom: none; }
.document-link { color: var(--accent); text-decoration: none; font-weight: 500; }
.document-link:hover { text-decoration: underline; }
.page-badge {
    display: inline-block; background: var(--accent-soft); color: var(--accent-hover);
    padding: 3px 9px; border-radius: 20px; font-size: 12px; font-weight: 600; margin: 2px 4px 2px 0;
    border: 1px solid var(--accent-soft-2);
}

/* markdown tables in answers */
.bubble-content .md-table, .chat-response .md-table { border-collapse: collapse; width: 100%; margin: 10px 0; font-size: 13px; display: block; overflow-x: auto; }
.bubble-content .md-table th, .chat-response .md-table th { background: var(--accent-soft); color: var(--accent-hover); padding: 8px 12px; text-align: left; border: 1px solid var(--border); font-weight: 600; white-space: nowrap; }
.bubble-content .md-table td, .chat-response .md-table td { padding: 7px 12px; border: 1px solid var(--border); color: var(--text-2); vertical-align: top; }
.bubble-content .md-table tbody tr:nth-child(even) td, .chat-response .md-table tbody tr:nth-child(even) td { background: var(--surface-2); }

/* ── Input bar ───────────────────────────────────────────────────────────── */
.chat-input-bar {
    padding: 8px max(24px, (100% - 740px) / 2) 18px;
    display: flex; align-items: flex-end; gap: 10px;
    flex-shrink: 0; background: var(--bg);
}
.chat-input-bar > textarea {
    flex: 1; background: var(--surface); border: 1px solid var(--border); border-radius: 18px;
    padding: 13px 16px; color: var(--text); font-size: 14.5px; resize: none; font-family: inherit;
    line-height: 1.5; min-height: 50px; max-height: 180px; overflow-y: auto;
    transition: border-color 0.18s, box-shadow 0.18s; box-shadow: 0 2px 10px var(--shadow);
}
.chat-input-bar > textarea:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }
.chat-input-bar > textarea::placeholder { color: var(--text-3); }

.btn-send {
    background: var(--accent); color: var(--accent-contrast); border: none; border-radius: 14px;
    width: 50px; height: 50px; font-size: 0; cursor: pointer; white-space: nowrap;
    transition: background 0.18s; flex-shrink: 0; display: flex; align-items: center; justify-content: center;
    position: relative;
}
.btn-send::after {
    content: ""; width: 18px; height: 18px;
    background: currentColor;
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cline x1='12' y1='19' x2='12' y2='5'/%3E%3Cpolyline points='5 12 12 5 19 12'/%3E%3C/svg%3E") center/contain no-repeat;
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cline x1='12' y1='19' x2='12' y2='5'/%3E%3Cpolyline points='5 12 12 5 19 12'/%3E%3C/svg%3E") center/contain no-repeat;
}
.btn-send:hover:not(:disabled) { background: var(--accent-hover); }
.btn-send:disabled { opacity: 0.45; cursor: not-allowed; }

/* ============================================================================
   Modals (settings, history search, idle, system prompts)
   ============================================================================ */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(15, 19, 22, 0.45); backdrop-filter: blur(2px); z-index: 100; }
.modal-overlay.open { display: block; }

.modal {
    display: none; position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 480px; max-width: 95vw; max-height: 82vh;
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg);
    z-index: 101; overflow: hidden; flex-direction: column; box-shadow: 0 24px 60px var(--shadow-lg);
}
.modal.open, .modal.show { display: flex; }

.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.modal-header h3 { margin: 0; color: var(--text); font-size: 16px; font-weight: 700; }
.modal-close { background: none; border: none; color: var(--text-3); font-size: 18px; cursor: pointer; padding: 4px; line-height: 1; border-radius: 5px; }
.modal-close:hover { color: var(--text); background: var(--surface-2); }

.modal-body { padding: 20px; overflow-y: auto; flex: 1; display: flex; flex-direction: column; gap: 18px; }

.setting-group h4 { font-size: 12px; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.05em; margin: 0 0 10px; font-weight: 700; }
.modal-body .form-group { display: flex; flex-direction: column; gap: 5px; margin-bottom: 10px; }
.modal-body .form-group label { font-size: 12.5px; color: var(--text-2); font-weight: 500; }
.modal-body .form-group input {
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
    padding: 9px 11px; color: var(--text); font-size: 13px; width: 100%; box-sizing: border-box;
}
.modal-body .form-group input:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }

.form-row { display: flex; gap: 16px; align-items: flex-start; flex-wrap: wrap; margin-bottom: 10px; }
.form-row label { font-size: 13px; color: var(--text); display: flex; align-items: center; gap: 6px; cursor: pointer; }
.form-row input[type="checkbox"] { accent-color: var(--accent); width: 15px; height: 15px; }

.modal-actions { padding-top: 12px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 8px; }
.modal-actions .btn { margin: 0; }
.modal-actions .btn.primary { background: var(--accent); color: var(--accent-contrast); border: none; padding: 9px 20px; border-radius: var(--radius-sm); cursor: pointer; font-size: 14px; font-weight: 600; }
.modal-actions .btn.primary:hover { background: var(--accent-hover); }

/* old-style success/error popup (kept for safety) */
.modal-content { background: var(--surface); margin: auto; padding: 0; border: 1px solid var(--border); border-radius: var(--radius-lg); width: 90%; max-width: 480px; box-shadow: 0 24px 60px var(--shadow-lg); }
.modal-icon { font-size: 56px; margin: 24px auto 18px; text-align: center; }
.modal-icon.loading { width: 56px; height: 56px; }
.modal-icon.loading::after { content: ""; display: block; width: 56px; height: 56px; background: url('echelix-logo.png') center/contain no-repeat; animation: spin 2s linear infinite; }
.modal-icon.success::after { content: "✓"; color: var(--success); }
.modal-icon.error::after { content: "✕"; color: var(--danger); }
.modal-icon.warning::after { content: "!"; color: var(--warning); }
.modal-title { font-size: 22px; font-weight: 700; margin-bottom: 14px; color: var(--text); text-align: center; }
.modal-message { font-size: 15px; color: var(--text-2); margin-bottom: 18px; line-height: 1.6; text-align: center; }
.modal-details { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px; margin: 16px 20px; text-align: left; font-size: 14px; color: var(--text-2); }
.modal-details strong { color: var(--accent-hover); display: block; margin-bottom: 8px; }
@keyframes spin { from { transform: rotate(0); } to { transform: rotate(360deg); } }

/* z-index ordering for stacked modals */
#historySearchOverlay { z-index: 300; }
#historySearchModal { z-index: 301; }
#idleWarningOverlay { z-index: 400; background: rgba(15, 19, 22, 0.6); }
#idleWarningModal { z-index: 401; width: 400px; }

/* idle warning */
.idle-warning-text { color: var(--text); font-size: 14px; line-height: 1.5; margin: 0 0 18px; }
.idle-warning-text strong { color: var(--danger); }
.idle-warning-actions { display: flex; gap: 10px; }
.idle-warning-actions .btn { padding: 9px 18px; border-radius: var(--radius-sm); cursor: pointer; font-size: 14px; font-weight: 600; border: 1px solid transparent; margin: 0; }
.idle-warning-actions .btn.primary { background: var(--accent); color: var(--accent-contrast); }
.idle-warning-actions .btn.primary:hover { background: var(--accent-hover); }
.idle-warning-actions .btn.secondary { background: transparent; color: var(--text-2); border-color: var(--border); font-weight: 500; }
.idle-warning-actions .btn.secondary:hover { background: var(--surface-2); }

/* history search */
.history-search-body { gap: 12px; text-align: left; }
.history-search-inputwrap { position: relative; display: flex; align-items: center; }
.history-search-icon { position: absolute; left: 12px; font-size: 14px; opacity: 0.6; pointer-events: none; }
#historySearchInput { width: 100%; box-sizing: border-box; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 12px 12px 36px; color: var(--text); font-size: 15px; }
#historySearchInput:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }
.history-search-results { overflow-y: auto; max-height: 55vh; display: flex; flex-direction: column; gap: 4px; }
.hs-hint { color: var(--text-3); font-size: 13px; text-align: center; padding: 16px 8px; margin: 0; }
.hs-item { padding: 10px 12px; border-radius: var(--radius-sm); cursor: pointer; border: 1px solid transparent; transition: background 0.15s; }
.hs-item:hover { background: var(--surface-2); }
.hs-item.active { background: var(--accent-soft); }
.hs-title { color: var(--text); font-size: 14px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.hs-meta { color: var(--text-3); font-size: 12px; margin-top: 2px; display: flex; align-items: baseline; gap: 8px; }
.hs-meta-loc { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }

/* dev mode group */
.dev-mode-group { background: var(--success-soft); border: 1px solid var(--success-soft); border-radius: var(--radius-sm); padding: 12px 14px; }
.dev-mode-label { display: flex; align-items: center; gap: 10px; cursor: pointer; font-size: 14px; font-weight: 600; color: var(--success); }
.dev-mode-label input[type="checkbox"] { accent-color: var(--success); width: 16px; height: 16px; }
.dev-mode-hint { font-size: 12px; color: var(--text-3); margin: 6px 0 0; line-height: 1.5; }
.dev-mode-hint strong { color: var(--success); }

/* conversation context menu */
.conv-context-menu { display: none; position: fixed; z-index: 1000; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 4px 0; min-width: 150px; box-shadow: 0 12px 32px var(--shadow-lg); list-style: none; margin: 0; }
.conv-context-menu li { padding: 8px 16px; font-size: 14px; color: var(--text); cursor: pointer; }
.conv-context-menu li:hover { background: var(--surface-2); }
#ctxDelete:hover { color: var(--danger); }

/* ============================================================================
   System prompts manager
   ============================================================================ */
.sp-modal { width: 720px; }
.sp-modal .modal-body { overflow-y: auto; text-align: left; }
.sp-intro { color: var(--text-2); font-size: 12.5px; line-height: 1.5; margin: 0 0 16px; }
.sp-intro .sp-star { color: var(--warning); }
.sp-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 18px; }
.sp-empty { color: var(--text-3); font-size: 13px; text-align: center; padding: 14px 0; }
.sp-item { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; padding: 10px 12px; background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm); }
.sp-item-editing { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }
.sp-item-main { min-width: 0; }
.sp-item-title { color: var(--text); font-size: 13.5px; font-weight: 600; display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.sp-item-reason { color: var(--text-3); font-size: 11.5px; margin-top: 3px; line-height: 1.4; }
.sp-item-actions { display: flex; gap: 6px; flex-shrink: 0; }
.sp-star { color: var(--warning); }
.sp-badge { font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; padding: 2px 7px; border-radius: 999px; }
.sp-badge-approved { background: var(--success-soft); color: var(--success); }
.sp-badge-pending { background: var(--warning-soft); color: var(--warning); }
.sp-badge-rejected { background: var(--danger-soft); color: var(--danger); }
.sp-badge-shared { background: var(--accent-soft); color: var(--accent-hover); }
.sp-item-shared { background: var(--surface-2); }

.sp-editor { border-top: 1px solid var(--border); padding-top: 16px; }
.sp-editor h4 { margin: 0 0 12px; color: var(--text); font-size: 14px; }
.sp-toolbar { display: flex; align-items: center; gap: 4px; padding: 4px; background: var(--surface-2); border: 1px solid var(--border); border-bottom: none; border-radius: var(--radius-sm) var(--radius-sm) 0 0; }
.sp-tool { min-width: 28px; height: 26px; padding: 0 7px; background: var(--surface); color: var(--text-2); border: 1px solid var(--border); border-radius: 5px; font-size: 12px; cursor: pointer; }
.sp-tool:hover { background: var(--surface-3); color: var(--text); }
.sp-tool-sep { width: 1px; height: 18px; background: var(--border); margin: 0 3px; }
.sp-tool-spacer { flex: 1; }
.sp-tab { height: 26px; padding: 0 10px; background: transparent; color: var(--text-3); border: 1px solid transparent; border-radius: 5px; font-size: 12px; cursor: pointer; }
.sp-tab.active { background: var(--accent); color: var(--accent-contrast); }
.sp-textarea { display: none; width: 100%; box-sizing: border-box; resize: vertical; padding: 10px 12px; background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: 0 0 var(--radius-sm) var(--radius-sm); font-size: 13px; line-height: 1.5; font-family: var(--mono); }
.sp-textarea.open { display: block; }
.sp-textarea:focus { border-color: var(--accent); outline: none; }
.sp-preview { display: none; min-height: 120px; padding: 12px 14px; background: var(--surface); border: 1px solid var(--border); border-radius: 0 0 var(--radius-sm) var(--radius-sm); color: var(--text); font-size: 13px; line-height: 1.55; }
.sp-preview.open { display: block; }
.sp-preview-empty { color: var(--text-3); }
.sp-preview h3, .sp-preview h4, .sp-preview h5 { margin: 10px 0 6px; color: var(--text); }
.sp-preview p { margin: 6px 0; }
.sp-preview ul, .sp-preview ol { margin: 6px 0; padding-left: 22px; }
.sp-preview code { background: var(--surface-2); padding: 1px 5px; border-radius: 4px; font-size: 12px; font-family: var(--mono); }
.sp-preview pre { background: var(--surface-2); padding: 10px; border-radius: 6px; overflow-x: auto; }
.sp-preview strong { color: var(--text); }
.sp-feedback { margin: 14px 0 4px; padding: 10px 12px; border-radius: var(--radius-sm); font-size: 12.5px; line-height: 1.5; }
.sp-feedback strong { display: block; margin-bottom: 2px; }
.sp-fb-ok { background: var(--success-soft); color: var(--success); border: 1px solid var(--success-soft); }
.sp-fb-warn { background: var(--warning-soft); color: var(--warning); border: 1px solid var(--warning-soft); }
.sp-fb-bad { background: var(--danger-soft); color: var(--danger); border: 1px solid var(--danger-soft); }
.sp-fb-reason { color: var(--text-2); margin-top: 2px; }
.sp-fb-patterns { color: var(--text-3); font-size: 11px; margin-top: 4px; font-family: var(--mono); }
.sp-actions { display: flex; justify-content: flex-end; gap: 8px; }
.sp-section-label { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--text-3); margin: 14px 2px 6px; }
.sp-section-label:first-child { margin-top: 0; }
.sp-shared-body { margin-top: 8px; padding: 10px 12px; background: var(--surface); border: 1px solid var(--border); border-radius: 6px; color: var(--text-2); font-size: 12.5px; line-height: 1.55; }
.sp-shared-body h3, .sp-shared-body h4, .sp-shared-body h5 { margin: 8px 0 4px; color: var(--text); }
.sp-shared-body p { margin: 5px 0; }
.sp-shared-body ul, .sp-shared-body ol { margin: 5px 0; padding-left: 20px; }
.sp-shared-body code { background: var(--surface-2); padding: 1px 5px; border-radius: 4px; font-family: var(--mono); }
.sp-shared-body strong { color: var(--text); }

/* ============================================================================
   Auth page
   ============================================================================ */
.auth-container {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    background: var(--bg); padding: 20px; position: relative; overflow: hidden;
}
.auth-card {
    background: var(--surface); border: 1px solid var(--border); border-radius: 20px;
    box-shadow: 0 12px 40px var(--shadow-md); padding: 46px 42px; width: 100%; max-width: 420px;
    text-align: center; position: relative; animation: cardFloat 0.5s ease-out;
}
@keyframes cardFloat { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.auth-header { margin-bottom: 30px; }
.auth-logo { margin-bottom: 22px; display: flex; justify-content: center; }
.auth-logo-mark { width: 64px; height: 64px; border-radius: 18px; background: var(--surface-2); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; }
.auth-logo-mark img { width: 38px; height: 38px; object-fit: contain; }
.auth-logo-mark .logo-light { display: block; }
.auth-logo-mark .logo-dark { display: none; }
.auth-logo svg { display: none; }   /* legacy inline svg hidden; real mark used instead */
.auth-header h1 { font-size: 27px; font-weight: 700; margin-bottom: 10px; color: var(--text); letter-spacing: -0.02em; }
.auth-header p { color: var(--text-2); font-size: 14.5px; line-height: 1.5; }

.microsoft-btn {
    display: flex; align-items: center; justify-content: center; gap: 12px; width: 100%;
    padding: 14px 24px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
    font-size: 15px; font-weight: 600; color: var(--text); cursor: pointer; transition: all 0.18s ease; font-family: inherit;
}
.microsoft-btn:hover { border-color: var(--accent); background: var(--surface-2); }
.microsoft-btn svg { flex-shrink: 0; }

.auth-loading { padding: 40px 20px; }
.auth-spinner { width: 56px; height: 56px; margin: 0 auto 22px; background: url('echelix-logo.png') center/contain no-repeat; animation: spin 2s linear infinite; }
:root[data-theme="dark"] .auth-spinner { background-image: url('echelix-logo-wht.png'); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .auth-spinner { background-image: url('echelix-logo-wht.png'); } }
.auth-loading p { color: var(--text-2); font-size: 15px; }

.auth-error { padding: 24px; }
.auth-error .error-icon { margin-bottom: 16px; }
.auth-error .error-icon svg { stroke: var(--danger); width: 48px; height: 48px; }
.auth-error p { color: var(--danger); margin-bottom: 20px; font-size: 14px; line-height: 1.5; }

.auth-warning { background: var(--warning-soft); border: 1px solid var(--warning-soft); border-radius: var(--radius); padding: 20px; text-align: left; }
.auth-warning .warning-icon { margin-bottom: 12px; }
.auth-warning .warning-icon svg { stroke: var(--warning); }
.auth-warning p { color: var(--warning); margin-bottom: 12px; font-size: 14px; }
.auth-warning p strong { color: var(--text); }
.auth-warning ul { margin: 12px 0 0 22px; color: var(--text-2); font-size: 13px; }
.auth-warning code { background: var(--surface-2); padding: 3px 8px; border-radius: 4px; font-family: var(--mono); font-size: 12px; color: var(--accent-hover); }

.auth-footer { margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--border); }
.auth-footer p { color: var(--text-3); font-size: 12px; }

/* ============================================================================
   Logo swap for dark theme (rail, empty state, auth)
   ============================================================================ */
:root[data-theme="dark"] .logo-light { display: none !important; }
:root[data-theme="dark"] .logo-dark { display: block !important; }
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .logo-light { display: none !important; }
    :root:not([data-theme="light"]) .logo-dark { display: block !important; }
}

/* ============================================================================
   Responsive
   ============================================================================ */
@media (max-width: 900px) {
    .chat-sidebar { width: 230px; }
    .chat-bubble.user { max-width: 84%; }
}

@media (max-width: 768px) {
    .chat-sidebar {
        position: fixed; left: -300px; top: 0; height: 100vh; z-index: 200; width: 270px;
        transition: left 0.25s ease; box-shadow: 6px 0 24px var(--shadow-lg);
    }
    .chat-sidebar.open { left: 0; }
    .chat-bubble.user { max-width: 90%; }
    .btn-sidebar-toggle { display: flex; }
    .btn-collapse-sidebar, .btn-expand-sidebar { display: none; }
    .chat-header { padding: 8px 12px; gap: 8px; }
    .filter-group { padding: 4px 4px 4px 9px; }
    .filter-group label { display: none; }
    .filter-group select { min-width: 78px; font-size: 12px; }
    .chat-thread { padding: 14px 14px 8px; gap: 18px; }
    .chat-input-bar { padding: 8px 12px 14px; }
    .suggestion-grid { grid-template-columns: 1fr; }
    .modal { top: 12px; left: 12px; right: 12px; bottom: auto; width: auto; max-width: none; max-height: calc(100vh - 24px); transform: none; }
    .modal-body { padding: 16px; gap: 14px; }
    .container { padding: 18px 14px; }
    .section, .config-section, .output-container { padding: 20px; }
    .nav-container { flex-wrap: wrap; gap: 10px; padding: 12px; }
    .nav-links { order: 3; width: 100%; }
}

@media (max-width: 480px) {
    .filter-group select { min-width: 64px; }
    .auth-card { padding: 36px 26px; }
    .auth-header h1 { font-size: 23px; }
}