/* ============ AI Chat — dark theme ============ */

:root {
    --bg:          #0f1117;
    --bg-2:        #161a23;
    --bg-3:        #1e2430;
    --border:      #2a3140;
    --text:        #e6e9ef;
    --text-dim:    #9aa3b2;
    --text-dimmer: #6b7484;
    --accent:      #6c8cff;
    --accent-2:    #4e6ef2;
    --danger:      #ff6b6b;
    --user-bubble: #31427a;
    --ai-bubble:   #1b2130;
    --radius:      12px;
    --sidebar-w:   280px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 "Helvetica Neue", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.55;
}

button { font: inherit; cursor: pointer; }
textarea, input { font: inherit; }
a { color: var(--accent); }

/* ---------------- layout ---------------- */

body {
    display: flex;
    overflow: hidden;
}

.sidebar {
    width: var(--sidebar-w);
    min-width: var(--sidebar-w);
    height: 100vh;
    height: 100dvh;
    background: var(--bg-2);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.main {
    flex: 1;
    height: 100vh;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* ---------------- sidebar ---------------- */

.sidebar-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 14px 14px 10px;
    border-bottom: 1px solid var(--border);
}

.brand { font-weight: 700; letter-spacing: 0.3px; }

.conv-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.conv-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 9px 10px;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-dim);
    margin-bottom: 2px;
    user-select: none;
}
.conv-item:hover  { background: var(--bg-3); color: var(--text); }
.conv-item.active { background: var(--bg-3); color: var(--text); }

.conv-label {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conv-del {
    background: none;
    border: none;
    color: var(--text-dimmer);
    padding: 2px 4px;
    border-radius: 6px;
    opacity: 0;
    transition: opacity 0.15s;
}
.conv-item:hover .conv-del { opacity: 1; }
.conv-del:hover { color: var(--danger); background: rgba(255,107,107,0.1); }

.sidebar-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 12px 14px;
    border-top: 1px solid var(--border);
}
.user-name {
    color: var(--text-dim);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.logout-form { margin: 0; }

/* ---------------- topbar ---------------- */

.topbar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-2);
}
.conv-title {
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.menu-btn { display: none; font-size: 18px; }

/* ---------------- messages ---------------- */

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px 16px 10px;
    scroll-behavior: smooth;
}

.msg-row {
    display: flex;
    margin: 0 auto 14px;
    max-width: 820px;
}
.msg-row.user      { justify-content: flex-end; }
.msg-row.assistant { justify-content: flex-start; }

.bubble {
    max-width: 86%;
    padding: 10px 14px;
    border-radius: var(--radius);
    word-wrap: break-word;
    overflow-wrap: anywhere;
}

.user-bubble {
    background: var(--user-bubble);
    border-bottom-right-radius: 4px;
    white-space: pre-wrap;
}

.ai-bubble {
    background: var(--ai-bubble);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
    width: 86%;
}

.error-bubble {
    background: rgba(255,107,107,0.12);
    border: 1px solid rgba(255,107,107,0.4);
    color: var(--danger);
}

/* ---------------- thinking panel ---------------- */

.think {
    margin: -2px -4px 8px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: rgba(0,0,0,0.25);
    overflow: hidden;
}

.think-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    color: var(--text-dimmer);
    font-size: 12.5px;
    padding: 7px 10px;
}
.think-toggle:hover { color: var(--text-dim); }

.think .chev { transition: transform 0.2s; display: inline-block; }
.think.open .chev { transform: rotate(180deg); }

.think-body {
    display: none;
    margin: 0;
    padding: 0 12px 10px;
    max-height: 260px;
    overflow-y: auto;
    color: var(--text-dimmer);         /* dimmer than the answer */
    font-size: 12.5px;                 /* smaller than the answer */
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    white-space: pre-wrap;
    word-break: break-word;
}
.think.open .think-body { display: block; }

/* pulsing "live" dot */
.pulse {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    display: inline-block;
    animation: pulse 1.2s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 0.25; transform: scale(0.8); }
    50%      { opacity: 1;    transform: scale(1.15); }
}

/* ---------------- answer / status ---------------- */

.gen-status {
    color: var(--text-dim);
    font-size: 13px;
    font-style: italic;
    margin-bottom: 6px;
}

.cold-note {
    color: #d8b45a;
    font-size: 12.5px;
    margin-bottom: 6px;
}

.answer { font-size: 15px; }
.answer strong { color: #fff; }

.codeblock {
    background: #0b0d12;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 12px;
    overflow-x: auto;
    margin: 8px 0;
    font-size: 13px;
}
.codeblock code {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    white-space: pre;
}
.inline-code {
    background: #0b0d12;
    border: 1px solid var(--border);
    border-radius: 5px;
    padding: 1px 5px;
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 13px;
}

.muted { color: var(--text-dimmer); }

/* ---------------- empty state ---------------- */

.empty-state {
    text-align: center;
    color: var(--text-dim);
    margin-top: 14vh;
}
.empty-icon { font-size: 44px; margin-bottom: 8px; }
.empty-state .hint { color: var(--text-dimmer); font-size: 13px; }

/* ---------------- composer ---------------- */

.composer-wrap {
    padding: 10px 16px 14px;
    border-top: 1px solid var(--border);
    background: var(--bg-2);
}

.composer {
    display: flex;
    gap: 8px;
    max-width: 820px;
    margin: 0 auto;
}

.composer textarea {
    flex: 1;
    resize: none;
    background: var(--bg-3);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 12px;
    outline: none;
    max-height: 180px;
}
.composer textarea:focus { border-color: var(--accent); }
.composer textarea:disabled { opacity: 0.55; }

.composer-hint {
    max-width: 820px;
    margin: 6px auto 0;
    color: var(--text-dimmer);
    font-size: 11.5px;
    text-align: right;
}

.global-error {
    max-width: 820px;
    margin: 0 auto 8px;
    color: var(--danger);
    font-size: 13px;
}

/* ---------------- buttons ---------------- */

.btn {
    border: 1px solid var(--border);
    border-radius: 9px;
    padding: 9px 16px;
    background: var(--bg-3);
    color: var(--text);
    transition: background 0.15s, border-color 0.15s;
}
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

.btn-primary {
    background: var(--accent-2);
    border-color: var(--accent-2);
    color: #fff;
}
.btn-primary:hover:not(:disabled) { background: var(--accent); }

.btn-ghost { background: transparent; }
.btn-ghost:hover { background: var(--bg-3); }

.btn-sm { padding: 5px 10px; font-size: 13px; }
.btn-block { width: 100%; }

/* ---------------- auth pages ---------------- */

.auth-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    min-height: 100dvh;
    padding: 20px;
    overflow: auto;
}

.auth-card {
    width: 100%;
    max-width: 400px;
    background: var(--bg-2);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 28px 26px;
}

.auth-title { margin: 0 0 2px; font-size: 22px; text-align: center; }
.auth-sub   { margin: 0 0 18px; font-size: 15px; font-weight: 500;
              color: var(--text-dim); text-align: center; }

.auth-form label {
    display: block;
    margin-bottom: 14px;
    color: var(--text-dim);
    font-size: 13.5px;
}
.auth-form input {
    display: block;
    width: 100%;
    margin-top: 5px;
    background: var(--bg-3);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 9px;
    padding: 10px 12px;
    outline: none;
}
.auth-form input:focus { border-color: var(--accent); }

.auth-error {
    background: rgba(255,107,107,0.12);
    border: 1px solid rgba(255,107,107,0.4);
    color: var(--danger);
    border-radius: 9px;
    padding: 9px 12px;
    margin-bottom: 14px;
    font-size: 13.5px;
}
.auth-notice {
    background: rgba(108,140,255,0.12);
    border: 1px solid rgba(108,140,255,0.4);
    color: var(--accent);
    border-radius: 9px;
    padding: 9px 12px;
    margin-bottom: 14px;
    font-size: 13.5px;
}
.auth-alt { text-align: center; color: var(--text-dim); margin-top: 16px; }

/* ---------------- mobile ---------------- */

.overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.55);
    z-index: 40;
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0; top: 0;
        z-index: 50;
        transform: translateX(-100%);
        transition: transform 0.22s ease;
        box-shadow: 4px 0 24px rgba(0,0,0,0.4);
    }
    body.sidebar-open .sidebar { transform: translateX(0); }

    .menu-btn { display: inline-block; }
    .bubble   { max-width: 94%; }
    .ai-bubble { width: 94%; }
    .messages { padding: 14px 10px 8px; }
    .composer-wrap { padding: 8px 10px 10px; }
}