* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --bg: #191a1a;
    --bg-secondary: #202222;
    --bg-tertiary: #2a2c2c;
    --border: #2e3030;
    --border-light: #3a3d3d;
    --text: #ececec;
    --text-secondary: #9aa0a0;
    --text-dim: #636969;
    --accent: #20b8cd;
    --accent-dim: #1a8a9a;
}
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --- Settings Modal --- */
#settings-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.65);
    z-index: 100;
}
#settings-overlay.open { display: block; }
#settings-modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 101;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: 16px;
    padding: 28px 32px;
    width: 420px;
    max-width: calc(100vw - 32px);
    box-shadow: 0 24px 64px rgba(0,0,0,0.6);
}
#settings-modal.open { display: block; }
#settings-modal h2 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}
.settings-desc {
    font-size: 12px;
    color: var(--text-dim);
    margin-bottom: 20px;
}
.settings-desc strong { color: var(--accent); }
.form-group { margin-bottom: 14px; }
.form-group label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}
.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    background: var(--bg-tertiary);
    color: var(--text);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 9px 12px;
    font-size: 13px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.15s;
    resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus { border-color: var(--accent-dim); }
.form-row { display: flex; gap: 12px; }
.form-row .form-group { flex: 1; }
#btn-save-settings {
    width: 100%;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 10px 0;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 4px;
    transition: background 0.15s;
}
#btn-save-settings:hover { background: var(--accent-dim); }
#settings-status {
    margin-top: 10px;
    font-size: 12px;
    color: var(--text-dim);
    min-height: 18px;
    text-align: center;
}
#settings-status.ok { color: #6fcf6f; }
#settings-status.err { color: #f87171; }
.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
}
.settings-header h2 { margin-bottom: 0; }
#btn-close-settings {
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 18px;
    cursor: pointer;
    padding: 0 2px;
    line-height: 1;
}
#btn-close-settings:hover { color: var(--text); }
.settings-access {
    margin-top: 10px;
    font-size: 12px;
    color: var(--text-dim);
    text-align: center;
}
.settings-access a {
    color: var(--accent);
    text-decoration: none;
}
.settings-access a:hover { text-decoration: underline; }

/* --- Top Bar --- */
#top-bar {
    display: flex;
    align-items: center;
    padding: 10px 24px;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    gap: 12px;
    min-height: 48px;
    flex-shrink: 0;
}
#top-bar .logo { font-size: 15px; font-weight: 700; color: var(--accent); letter-spacing: -0.3px; }
#top-bar .kineva { font-size: 24px; font-weight: 800; color: var(--accent); letter-spacing: 1px; text-transform: uppercase; }
#top-bar .sep { color: var(--border-light); margin: 0 4px; }
#model-name { font-size: 12px; color: var(--text-dim); }
#token-stats { font-size: 11px; color: var(--text-dim); margin-left: 8px; font-variant-numeric: tabular-nums; }
#top-bar .spacer { flex: 1; }
#model-select {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 11px;
    cursor: pointer;
    outline: none;
}
#rebotnix-logo-hero {
    font-size: 13px;
    font-weight: 800;
    color: var(--text-dim);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-top: 8px;
    opacity: 0.6;
}

/* --- Welcome Screen --- */
#welcome {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
}
#welcome.hidden { display: none; }
.kineva-hero {
    font-size: 72px;
    font-weight: 900;
    letter-spacing: 4px;
    color: var(--accent);
    text-transform: uppercase;
    line-height: 1;
    margin-bottom: 4px;
    text-shadow: 0 2px 20px rgba(0,0,0,0.15);
}
.kineva-tagline {
    font-size: 18px;
    font-weight: 500;
    color: var(--text-dim);
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}
#welcome h2 { font-size: 28px; font-weight: 600; color: var(--text); }
#welcome p { font-size: 14px; color: var(--text-dim); max-width: 400px; text-align: center; line-height: 1.5; }
.quick-actions { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; justify-content: center; }
.quick-actions button {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s;
}
.quick-actions button:hover { background: var(--bg-tertiary); border-color: var(--border-light); color: var(--text); }

/* --- Chat Area --- */
#chat-area {
    flex: 1;
    overflow-y: auto;
    display: none;
    flex-direction: column;
}
#chat-area.active { display: flex; }
#chat-area::-webkit-scrollbar { width: 6px; }
#chat-area::-webkit-scrollbar-track { background: transparent; }
#chat-area::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.thread { max-width: 768px; width: 100%; margin: 0 auto; padding: 0 24px; }

.query-block { padding: 28px 0 16px 0; border-bottom: 1px solid var(--border); }
.query-block .query-text { font-size: 20px; font-weight: 600; color: var(--text); line-height: 1.4; }
.query-block .query-img { max-width: 200px; border-radius: 8px; margin-top: 10px; border: 1px solid var(--border); }

.answer-block {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px 20px 20px 20px;
    margin: 12px 0 24px 0;
    font-size: 15px;
    line-height: 1.75;
    color: var(--text);
    word-wrap: break-word;
}
.answer-block .copy-bar {
    display: flex;
    justify-content: flex-end;
    margin: 12px 0 0 0;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}
.copy-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    color: var(--text-secondary);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    gap: 6px;
}
.copy-btn:hover { color: var(--text); background: var(--bg-secondary); border-color: var(--accent-dim); }
.copy-btn.copied { color: var(--accent); border-color: var(--accent); }
.answer-block .ab-content > p,
.answer-block .ab-content > ul,
.answer-block .ab-content > ol,
.answer-block .ab-content > blockquote,
.answer-block .ab-content > pre,
.answer-block .ab-content > table,
.answer-block .ab-content > h1,
.answer-block .ab-content > h2,
.answer-block .ab-content > h3 { position: relative; padding-left: 28px; }
.p-copy {
    position: absolute;
    left: 0; top: 2px;
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    padding: 2px;
    border-radius: 4px;
    opacity: 0;
    transition: opacity 0.1s, color 0.15s;
    display: flex;
    align-items: center;
}
.answer-block .ab-content > *:hover > .p-copy { opacity: 1; }
.p-copy:hover { color: var(--accent); }
.p-copy.copied { opacity: 1; color: var(--accent); }
.answer-block p { margin: 0 0 12px 0; }
.answer-block p:last-child { margin-bottom: 0; }
.answer-block ul, .answer-block ol { margin: 8px 0 12px 24px; }
.answer-block li { margin: 4px 0; }
.answer-block h1, .answer-block h2, .answer-block h3 { margin: 16px 0 8px 0; color: var(--accent); }
.answer-block h1 { font-size: 1.4em; }
.answer-block h2 { font-size: 1.2em; }
.answer-block h3 { font-size: 1.05em; }
.answer-block blockquote { border-left: 3px solid var(--accent-dim); padding-left: 12px; color: var(--text-secondary); margin: 8px 0; }
.answer-block table { border-collapse: collapse; margin: 12px 0; width: 100%; }
.answer-block th, .answer-block td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.answer-block th { background: var(--bg-tertiary); }
.answer-block .katex-display { margin: 12px 0; overflow-x: auto; }
.answer-block hr { border: none; border-top: 1px solid var(--border); margin: 16px 0; }
.answer-block img { max-width: 100%; border-radius: 10px; margin: 12px 0; border: 1px solid var(--border); }
.answer-block code { background: var(--bg-tertiary); padding: 2px 6px; border-radius: 4px; font-size: 13px; font-family: 'SF Mono', 'Fira Code', monospace; }
.answer-block pre { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 8px; padding: 14px 18px; margin: 12px 0; overflow-x: auto; }
.answer-block pre code { background: none; padding: 0; }

.error-line {
    font-size: 13px;
    color: #f87171;
    background: rgba(248,113,113,0.08);
    border: 1px solid rgba(248,113,113,0.2);
    border-radius: 8px;
    padding: 10px 14px;
    margin: 8px 0 16px 0;
}

/* Typing indicator */
#typing-indicator { display: none; max-width: 768px; width: 100%; margin: 0 auto; padding: 8px 24px 20px 24px; }
#typing-indicator.active { display: block; }
#typing-indicator .dots { display: inline-flex; gap: 4px; }
#typing-indicator .dots span { width: 6px; height: 6px; background: var(--accent); border-radius: 50%; animation: pulse 1.4s infinite; }
#typing-indicator .dots span:nth-child(2) { animation-delay: 0.2s; }
#typing-indicator .dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes pulse {
    0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
    40% { opacity: 1; transform: scale(1); }
}

/* --- Input Area --- */
#input-wrapper { padding: 0 24px 24px 24px; max-width: 768px; width: 100%; margin: 0 auto; flex-shrink: 0; }
#input-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 4px;
    transition: border-color 0.2s;
    display: flex;
    flex-direction: column;
}
#input-box:focus-within { border-color: var(--border-light); }
#image-preview { display: none; padding: 8px 12px 0 12px; position: relative; }
#image-preview img { max-height: 60px; border-radius: 8px; border: 1px solid var(--border); }
#image-preview .remove-img {
    position: absolute; top: 4px; right: 8px;
    background: var(--bg-tertiary); color: var(--text-dim);
    border: none; border-radius: 50%;
    width: 20px; height: 20px; font-size: 12px; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
}
#input-row { display: flex; align-items: flex-end; gap: 4px; padding: 4px; }
#msg-input {
    flex: 1;
    background: transparent;
    color: var(--text);
    border: none;
    padding: 10px 12px;
    font-family: inherit;
    font-size: 14px;
    resize: none;
    outline: none;
    min-height: 24px;
    max-height: 200px;
    line-height: 1.5;
}
#msg-input::placeholder { color: var(--text-dim); }
.input-btn {
    background: none; border: none; color: var(--text-dim);
    padding: 8px; border-radius: 8px; cursor: pointer;
    font-size: 18px; transition: all 0.15s;
    display: flex; align-items: center; justify-content: center;
}
.input-btn:hover { color: var(--text); background: var(--bg-tertiary); }
.input-btn.has-image { color: var(--accent); }
.stop-btn { color: #f87171; }
.stop-btn:hover { color: #ff9999; background: rgba(248,113,113,0.1); }
#btn-send {
    background: var(--accent); color: #fff; border: none;
    border-radius: 10px; padding: 8px 12px; cursor: pointer;
    font-size: 16px; display: flex; align-items: center; justify-content: center;
    transition: all 0.15s; min-width: 36px; min-height: 36px;
}
#btn-send:hover { background: var(--accent-dim); }
#btn-send:disabled { background: var(--bg-tertiary); color: var(--text-dim); cursor: not-allowed; }
#file-input { display: none; }
.input-hint { font-size: 11px; color: var(--text-dim); text-align: center; padding: 6px 0 0 0; }

/* --- Sidebar --- */
#main-layout { display: flex; flex: 1; overflow: hidden; }
#sidebar {
    width: 260px; min-width: 260px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex; flex-direction: column; overflow: hidden;
}
#sidebar .sidebar-header {
    padding: 14px 16px 10px 16px;
    font-size: 12px; font-weight: 600; color: var(--text-secondary);
    text-transform: uppercase; letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.btn-new-chat {
    margin: 8px 12px; padding: 8px 0;
    background: var(--bg-tertiary); border: 1px solid var(--border-light);
    color: var(--text-secondary); border-radius: 8px; font-size: 13px;
    cursor: pointer; transition: all 0.15s; width: calc(100% - 24px); flex-shrink: 0;
}
.btn-new-chat:hover { color: var(--text); border-color: var(--accent-dim); background: var(--bg); }
#session-list { flex: 1; overflow-y: auto; padding: 6px 0; }
#session-list::-webkit-scrollbar { width: 4px; }
#session-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
.session-item {
    display: flex; align-items: center;
    padding: 10px 16px; cursor: pointer;
    transition: background 0.1s; gap: 10px;
    border-left: 3px solid transparent;
}
.session-item:hover { background: var(--bg-tertiary); }
.session-item.active { background: var(--bg-tertiary); border-left-color: var(--accent); }
.session-item .si-content { flex: 1; overflow: hidden; }
.session-item .si-title { font-size: 13px; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.session-item .si-date { font-size: 11px; color: var(--text-dim); margin-top: 2px; }
.session-item .si-delete {
    opacity: 0; background: none; border: none; color: var(--text-dim);
    cursor: pointer; font-size: 14px; padding: 2px 6px; border-radius: 4px;
    transition: opacity 0.1s, color 0.1s;
}
.session-item:hover .si-delete { opacity: 1; }
.session-item .si-delete:hover { color: #f87171; }
#main-content { flex: 1; display: flex; flex-direction: column; overflow: hidden; }

@media (max-width: 700px) {
    #sidebar { display: none; }
    .kineva-hero { font-size: 42px; }
    .thread { padding: 0 16px; }
    #input-wrapper { padding: 0 16px 16px 16px; }
    #top-bar { padding: 10px 16px; }
    #top-bar .kineva { font-size: 18px; }
    #top-bar .logo { display: none; }
}