* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, sans-serif;
    background: #0f0f12;
    color: #e4e4e7;
    min-height: 100vh;
}

/* Login */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.login-box {
    background: #18181b;
    border-radius: 12px;
    padding: 2rem;
    width: 100%;
    max-width: 360px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

.login-box h1 {
    margin: 0 0 0.25rem;
    font-size: 1.5rem;
}

.login-box .subtitle {
    color: #a1a1aa;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.login-box .error {
    color: #f87171;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.login-box .success {
    color: #4ade80;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.login-box .login-footer {
    margin-top: 1.25rem;
    font-size: 0.9rem;
}

.login-box .login-footer a {
    color: #93c5fd;
    text-decoration: none;
}

.login-box .login-footer a:hover {
    text-decoration: underline;
}

.login-box input {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border: 1px solid #3f3f46;
    border-radius: 8px;
    background: #27272a;
    color: #fff;
    font-size: 1rem;
}

.login-box input::placeholder {
    color: #71717a;
}

.login-box button {
    width: 100%;
    padding: 0.75rem;
    background: #3b82f6;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
}

.login-box button:hover {
    background: #2563eb;
}

/* Chat */
.chat-page {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.chat-header {
    display: flex;
    align-items: center;
    gap: 0;
    padding: 0 1.25rem;
    min-height: 52px;
    background: #18181b;
    border-bottom: 1px solid #27272a;
}

.chat-header .nav-brand {
    font-size: 1.15rem;
    font-weight: 600;
    color: #fff;
    text-decoration: none;
    white-space: nowrap;
}

.chat-header .nav-brand:hover {
    color: #93c5fd;
}

.chat-header .nav-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: auto;
}

.chat-header .nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.chat-header .nav-link {
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
    color: #a1a1aa;
    text-decoration: none;
    border-radius: 6px;
    transition: color 0.15s, background 0.15s;
}

.chat-header .nav-link:hover {
    color: #fff;
    background: #27272a;
}

.chat-header .nav-link-active {
    color: #93c5fd;
    font-weight: 500;
}

.chat-header .nav-link-active:hover {
    color: #93c5fd;
    background: rgba(147, 197, 253, 0.1);
}

.chat-header .nav-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chat-header .nav-logout {
    color: #f87171;
}

.chat-header .nav-logout:hover {
    color: #fca5a5;
    background: rgba(248, 113, 113, 0.1);
}

.chat-header .header-restart-btn {
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
    border-radius: 6px;
    border: 1px solid #3f3f46;
    background: #27272a;
    color: #a1a1aa;
    cursor: pointer;
}

.chat-header .header-restart-btn:hover:not(:disabled) {
    background: #3f3f46;
    color: #fff;
}

.chat-header .header-restart-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* Legacy class names for other pages (profile, rag, docs, usage) */
.chat-header .header-docs-link {
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
    color: #a1a1aa;
    text-decoration: none;
    border-radius: 6px;
}
.chat-header .header-docs-link:hover { color: #fff; background: #27272a; }
.chat-header .logout { color: #a1a1aa; text-decoration: none; font-size: 0.9rem; padding: 0.5rem 0.75rem; border-radius: 6px; }
.chat-header .logout:hover { color: #fff; background: #27272a; }
.chat-header h1 { margin: 0; font-size: 1.15rem; }
.chat-header .model-badge { background: #27272a; padding: 0.25rem 0.6rem; border-radius: 6px; font-size: 0.8rem; color: #a1a1aa; }

.status-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 0.5rem 1.5rem;
    background: #27272a;
    border-bottom: 1px solid #3f3f46;
    font-size: 0.8rem;
    color: #a1a1aa;
}

.status-bar span {
    white-space: nowrap;
}

.chat-layout {
    display: flex;
    flex: 1;
    min-height: 0;
}

.chat-sidebar {
    width: 260px;
    flex-shrink: 0;
    background: #18181b;
    border-right: 1px solid #27272a;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-name-block {
    padding: 0.75rem;
    border-bottom: 1px solid #27272a;
}

.sidebar-name-label {
    display: block;
    font-size: 0.75rem;
    color: #71717a;
    margin-bottom: 0.35rem;
}

.sidebar-name-input {
    width: 100%;
    padding: 0.5rem 0.6rem;
    border: 1px solid #3f3f46;
    border-radius: 6px;
    background: #27272a;
    color: #fff;
    font-size: 0.9rem;
}

.sidebar-name-input::placeholder {
    color: #71717a;
}

.new-chat-btn {
    margin: 0.75rem;
    padding: 0.6rem 1rem;
    background: #27272a;
    border: 1px solid #3f3f46;
    border-radius: 8px;
    color: #e4e4e7;
    font-size: 0.9rem;
    cursor: pointer;
    text-align: left;
}

.new-chat-btn:hover {
    background: #3f3f46;
}

.chat-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 0.5rem 0.5rem;
}

.chat-list-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.6rem 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    color: #a1a1aa;
    font-size: 0.9rem;
}

.chat-list-item:hover {
    background: #27272a;
    color: #fff;
}

.chat-list-item.active {
    background: #27272a;
    color: #fff;
}

.chat-list-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chat-list-delete {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    padding: 0;
    border: none;
    background: transparent;
    color: #71717a;
    font-size: 1.2rem;
    line-height: 1;
    cursor: pointer;
    border-radius: 4px;
}

.chat-list-delete:hover {
    color: #f87171;
    background: rgba(248, 113, 113, 0.1);
}

.chat-list-empty {
    padding: 1rem;
    color: #71717a;
    font-size: 0.85rem;
}

/* Sidebar toggle: visible only on mobile */
.sidebar-toggle-btn {
    display: none;
    position: fixed;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 98;
    padding: 0.5rem 0.6rem;
    font-size: 0.8rem;
    background: #27272a;
    border: 1px solid #3f3f46;
    border-left: none;
    border-radius: 0 8px 8px 0;
    color: #a1a1aa;
    cursor: pointer;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.3);
}
.sidebar-toggle-btn:hover {
    background: #3f3f46;
    color: #fff;
}

.chat-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
    padding: 1rem;
}

.chat-mode-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid #27272a;
}

.chat-mode-bar .mode-label {
    font-size: 0.85rem;
    color: #a1a1aa;
}

.chat-mode-bar .mode-btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
    border-radius: 8px;
    border: 1px solid #3f3f46;
    background: #27272a;
    color: #a1a1aa;
    cursor: pointer;
}

.chat-mode-bar .mode-btn:hover {
    background: #3f3f46;
    color: #fff;
}

.chat-mode-bar .mode-btn.active {
    background: #3b82f6;
    border-color: #3b82f6;
    color: #fff;
}

.chat-mode-bar .rag-link {
    margin-left: auto;
    font-size: 0.85rem;
    color: #93c5fd;
    text-decoration: none;
}

.chat-mode-bar .rag-link:hover {
    text-decoration: underline;
}

.rag-label {
    font-size: 0.8rem;
    color: #71717a;
    display: block;
    margin-bottom: 0.35rem;
}

.rag-upload-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 0.5rem;
}

.rag-upload-row input[type="file"] {
    font-size: 0.85rem;
    color: #a1a1aa;
    max-width: 280px;
}

.rag-upload-row button {
    padding: 0.35rem 0.6rem;
    font-size: 0.85rem;
    border-radius: 6px;
    border: 1px solid #3f3f46;
    background: #27272a;
    color: #e4e4e7;
    cursor: pointer;
}

.rag-upload-row button:hover {
    background: #3f3f46;
}

.rag-doc-list {
    max-height: 320px;
    overflow-y: auto;
}

.rag-doc-item {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 0;
    font-size: 0.9rem;
    color: #a1a1aa;
    border-bottom: 1px solid #27272a;
}

.rag-doc-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.rag-doc-delete {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    padding: 0;
    border: none;
    background: transparent;
    color: #71717a;
    font-size: 1.2rem;
    line-height: 1;
    cursor: pointer;
    border-radius: 4px;
}

.rag-doc-delete:hover {
    color: #f87171;
    background: rgba(248, 113, 113, 0.1);
}

.rag-msg {
    font-size: 0.9rem;
    color: #71717a;
    padding: 1rem 0;
}

.rag-page-main {
    max-width: 640px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.rag-upload-box {
    margin-bottom: 2rem;
}

.rag-list-box {}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 0;
}

.msg {
    margin-bottom: 1rem;
}

.msg .msg-role {
    font-size: 0.75rem;
    color: #71717a;
    margin-bottom: 0.25rem;
    display: block;
}

.msg.user .msg-role {
    color: #93c5fd;
}

.msg .msg-text {
    background: #27272a;
    padding: 0.75rem 1rem;
    border-radius: 10px;
    white-space: pre-wrap;
    word-break: break-word;
}

.msg.user .msg-text {
    background: #1e3a5f;
    margin-left: 2rem;
}

.msg.assistant .msg-text {
    margin-right: 0.5rem;
}

/* Typing cursor (streaming) */
.typing-cursor {
    display: inline-block;
    width: 2px;
    height: 1em;
    background: #3b82f6;
    margin-left: 2px;
    vertical-align: text-bottom;
    animation: cursor-blink 0.8s step-end infinite;
}

@keyframes cursor-blink {
    50% {
        opacity: 0;
    }
}

/* Typing indicator (waiting for first token) */
.typing-msg .typing-dots {
    display: inline-flex;
    gap: 4px;
    align-items: center;
}

.typing-msg .typing-dots span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #71717a;
    animation: typing-bounce 0.6s ease-in-out infinite both;
}

.typing-msg .typing-dots span:nth-child(2) {
    animation-delay: 0.1s;
}

.typing-msg .typing-dots span:nth-child(3) {
    animation-delay: 0.2s;
}

@keyframes typing-bounce {

    0%,
    80%,
    100% {
        transform: scale(0.8);
        opacity: 0.5;
    }

    40% {
        transform: scale(1);
        opacity: 1;
    }
}

.chat-form {
    display: flex;
    gap: 0.75rem;
    padding: 0.5rem 0;
    border-top: 1px solid #27272a;
}

.chat-form textarea {
    flex: 1;
    min-height: 44px;
    max-height: 160px;
    padding: 0.75rem 1rem;
    border: 1px solid #3f3f46;
    border-radius: 10px;
    background: #27272a;
    color: #fff;
    font: inherit;
    resize: none;
}

.chat-form textarea::placeholder {
    color: #71717a;
}

.chat-form button {
    padding: 0.75rem 1.25rem;
    background: #3b82f6;
    color: #fff;
    border: none;
    border-radius: 10px;
    font-weight: 500;
    cursor: pointer;
}

.chat-form button:hover:not(:disabled) {
    background: #2563eb;
}

.chat-form button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ========== Mobile responsive ========== */
@media (max-width: 768px) {
    /* Login / auth pages */
    .login-page {
        padding: 1rem;
        align-items: flex-start;
        padding-top: 2rem;
    }
    .login-box {
        padding: 1.25rem;
        max-width: 100%;
    }
    .login-box h1 {
        font-size: 1.35rem;
    }

    /* Chat page header */
    .chat-header {
        flex-wrap: wrap;
        gap: 0.35rem;
        padding: 0.5rem 0.75rem;
    }
    .chat-header .nav-brand {
        font-size: 1rem;
        margin-right: 0.75rem;
    }
    .chat-header .nav-links {
        flex-wrap: wrap;
        gap: 0.2rem;
    }
    .chat-header .nav-link {
        padding: 0.35rem 0.5rem;
        font-size: 0.8rem;
    }
    .chat-header .nav-actions {
        margin-left: auto;
    }
    .chat-header .header-restart-btn {
        padding: 0.3rem 0.5rem;
        font-size: 0.75rem;
    }

    /* Chat layout: sidebar as overlay on mobile */
    .chat-layout {
        position: relative;
    }
    .chat-sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        width: 280px;
        max-width: 85vw;
        z-index: 100;
        transform: translateX(-100%);
        transition: transform 0.2s ease;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.3);
    }
    .chat-layout.sidebar-open .chat-sidebar {
        transform: translateX(0);
    }
    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 99;
    }
    .chat-layout.sidebar-open .sidebar-overlay {
        display: block;
    }
    .sidebar-toggle-btn {
        display: block;
    }
    .chat-layout.sidebar-open .sidebar-toggle-btn {
        opacity: 0.5;
        pointer-events: none;
    }
    .chat-content {
        padding: 0.75rem;
        max-width: 100%;
    }
    .chat-mode-bar {
        flex-wrap: wrap;
        gap: 0.4rem;
    }
    .chat-mode-bar .mode-label {
        width: 100%;
    }
    .chat-mode-bar .rag-link {
        margin-left: 0;
        width: 100%;
    }
    .chat-form {
        gap: 0.5rem;
        padding: 0.4rem 0;
    }
    .chat-form textarea {
        min-height: 40px;
        padding: 0.6rem 0.75rem;
    }
    .chat-form button {
        padding: 0.6rem 1rem;
        flex-shrink: 0;
    }
    .msg.user .msg-text {
        margin-left: 0.5rem;
    }

    /* Status bar */
    .status-bar {
        padding: 0.4rem 1rem;
        font-size: 0.75rem;
        gap: 0.5rem;
    }

    /* RAG page */
    .rag-page-main {
        padding: 1rem 0.75rem;
    }
    .rag-upload-row {
        flex-wrap: wrap;
    }
    .rag-upload-row input[type="file"] {
        max-width: 100%;
        min-width: 0;
    }
    .rag-doc-list {
        max-height: 50vh;
    }
}

@media (max-width: 480px) {
    .login-page {
        padding: 0.75rem;
        padding-top: 1.5rem;
    }
    .login-box {
        padding: 1rem;
    }
    .chat-header .nav-brand {
        font-size: 0.95rem;
    }
    .chat-content {
        padding: 0.5rem;
    }
    .chat-form {
        flex-direction: column;
        align-items: stretch;
    }
    .chat-form button {
        width: 100%;
    }
    .docs-page,
    .profile-page {
        padding: 1rem 0.75rem;
    }
    .docs-page pre {
        padding: 0.75rem;
        font-size: 0.8rem;
    }
    .docs-page .endpoint-url {
        word-break: break-all;
    }
}

/* Prevent horizontal overflow everywhere */
html, body {
    overflow-x: hidden;
}
.docs-page pre,
.docs-page code,
.msg .msg-text {
    overflow-wrap: break-word;
    word-break: break-word;
}