:root {
    color-scheme: dark;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #1a1a1a;
    color: #e0e0e0;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    background: #1a1a1a;
}

.gemini-shell {
    display: flex;
    height: 100vh;
    overflow: hidden;
    position: relative;
    flex-direction: row;
}

/* Topbar */
.topbar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    z-index: 1100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    background: rgba(20, 20, 20, 0.55);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.topbar-brand {
    color: #e0e0e0;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.topbar-logo {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
    display: inline-block;

    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.04);
    box-shadow: 0 0 18px rgba(0, 210, 255, 0.12);
}

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

.topbar-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.06);
    color: #e0e0e0;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.topbar-icon:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.12);
}

.topbar-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    height: 40px;
    padding: 0 14px;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.06);
    background: rgba(255, 255, 255, 0.04);
    color: #e0e0e0;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.topbar-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.12);
}

.topbar-btn-text {
    font-size: 0.95rem;
}

.topbar-link {
    color: #e0e0e0;
    text-decoration: none;
    font-weight: 600;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid transparent;
    transition: border-color 0.15s ease, background 0.15s ease;
}

.topbar-link:hover {
    border-color: rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.06);
}



/* Sidebar (Gemini-like) */
.sidebar {
    width: 240px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
    border-right: 1px solid rgba(255, 255, 255, 0.06);
    display: flex;
    flex-direction: column;
    padding: 14px 14px;
    gap: 12px;
    overflow: hidden;
    margin-top: 56px; /* below topbar */

    /* Gemini-ish glass */
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

/* Gemini-ish “divider” between top actions and recents */
.sidebar-divider {
    border: none;
    height: 1px;
    margin: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
    opacity: 1;
}

.sidebar-top { flex-shrink: 0; }

.sidebar-mobile-header {
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.sidebar-title {
    font-size: 0.95rem;
    font-weight: 800;
    color: #e0e0e0;
    letter-spacing: 0.2px;
}

.sidebar-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.06);
    color: #e0e0e0;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.sidebar-close:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.12);
}

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

/* sidebar-divider redefined above */

.sidebar-history {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
    scrollbar-gutter: stable both-edges;

    /* Fade top/bottom like Gemini */
    position: relative;
    padding-bottom: 6px;
}

.sidebar-history::before,
.sidebar-history::after {
    content: "";
    position: sticky;
    left: 0;
    right: 0;
    height: 18px;
    pointer-events: none;
    z-index: 1;
    display: block;
}

.sidebar-history::before {
    top: 0;
    background: linear-gradient(180deg, rgba(26,26,26,0.0), rgba(26,26,26,0.9));
    opacity: 0.9;
}

.sidebar-history::after {
    bottom: 0;
    background: linear-gradient(0deg, rgba(26,26,26,0.0), rgba(26,26,26,0.9));
    opacity: 0.9;
}

.sidebar-history-header {
    position: sticky;
    top: 0;
    z-index: 2;

    background: rgba(26, 26, 26, 0.40);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);

    padding: 12px 6px 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.sidebar-history-title {
    font-weight: 800;
    color: #e0e0e0;
}

.sidebar-clear {
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.03);
    color: #e0e0e0;
    border-radius: 14px;
    height: 34px;
    padding: 0 12px;
    cursor: pointer;
    font-weight: 700;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.sidebar-clear:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(255, 255, 255, 0.14);
}

.sidebar-btn {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.02);
    color: #e0e0e0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;

    font-size: 0.95rem;
    font-weight: 650;

    transition:
        background 0.15s ease,
        border-color 0.15s ease,
        transform 0.15s ease,
        box-shadow 0.15s ease;
}

.sidebar-btn:hover {
    background: rgba(0, 210, 255, 0.08);
    border-color: rgba(0, 210, 255, 0.22);
    transform: translateY(-1px);
    box-shadow: 0 10px 24px rgba(0, 210, 255, 0.08);
}

.new-chat-btn {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.02);
    color: #e0e0e0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 0.95rem;
    font-weight: 650;
    transition:
        background 0.15s ease,
        border-color 0.15s ease,
        transform 0.15s ease,
        box-shadow 0.15s ease;
}

.new-chat-btn:hover {
    background: rgba(0, 210, 255, 0.08);
    border-color: rgba(0, 210, 255, 0.22);
    transform: translateY(-1px);
    box-shadow: 0 10px 24px rgba(0, 210, 255, 0.08);
}

/* (removed duplicate .sidebar-history block to keep Gemini-like fade overlays) */

.sidebar-history::-webkit-scrollbar {
    width: 8px;
}

.sidebar-history::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-history::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.10);
    border-radius: 6px;
}

.sidebar-history::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 210, 255, 0.22);
}

.history-items {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 0 2px;
}

.history-item {
    width: 100%;
    padding: 10px 12px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.06);
    color: #e0e0e0;
    cursor: pointer;
    font-size: 0.92rem;

    text-align: left;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;

    transition:
        background 0.15s ease,
        border-color 0.15s ease,
        box-shadow 0.15s ease,
        transform 0.15s ease;
}

.history-item:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.12);
    transform: translateY(-1px);
}

.history-item.active {
    background: linear-gradient(90deg, rgba(0, 210, 255, 0.18), rgba(0, 210, 255, 0.06));
    border-color: rgba(0, 210, 255, 0.26);
    box-shadow:
        0 0 0 1px rgba(0, 210, 255, 0.14) inset,
        0 14px 26px rgba(0, 210, 255, 0.10);
}

.history-empty {
    color: #6f86a1;
    font-size: 0.85rem;
    padding: 12px 8px;
    text-align: center;
    border-radius: 18px;
    border: 1px dashed rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.02);
}

.sidebar-close:focus-visible,
.sidebar-clear:focus-visible,
.sidebar-btn:focus-visible,
.history-item:focus-visible,
.topbar-icon:focus-visible,
.topbar-btn:focus-visible,
.topbar-link:focus-visible {
    outline: 2px solid rgba(0, 210, 255, 0.5);
    outline-offset: 2px;
}


.sidebar-bottom {
    flex-shrink: 0;
    border-top: 1px solid #3c3c3c;
    padding-top: 16px;
}

.footer-text {
    margin: 0;
    color: #9e9e9e;
    font-size: 0.8rem;
    text-align: center;
}

/* Chat Container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: #1a1a1a;
    overflow: hidden;
    margin-top: 56px; /* below topbar */
}

.chat-header {
    padding: 18px 20px;
    border-bottom: 1px solid #3c3c3c;
    flex-shrink: 0;
}


.chat-header h1 {
    margin: 0;
    font-size: 2rem;
    font-weight: 500;
    color: #e0e0e0;
}

.chat-messages {
    white-space: pre-wrap;
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: #3c3c3c;
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: #4c4c4c;
}

.greeting-panel {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
}

.greeting-panel h2 {
    font-size: 2.5rem;
    font-weight: 400;
    color: #e0e0e0;
    text-align: center;
    max-width: 600px;
}

.message {
    display: flex;
    gap: 12px;
    max-width: 80%;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-content {
    padding: 12px 16px;
    border-radius: 24px;
    line-height: 1.6;
    word-wrap: break-word;
    max-width: 100%;
}

.message.user .message-content {
    background: #1f62da;
    color: #ffffff;
    border-radius: 24px 4px 24px 24px;
}

.message.assistant .message-content {
    background: #2d2d2d;
    color: #e0e0e0;
    border-radius: 4px 24px 24px 24px;
}

.message.assistant.terminal .message-content {
    background: #1e1e2e;
    border: 1px solid #44475a;
    color: #f8f8f2;
    font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    white-space: pre-wrap;
    padding: 14px 18px;
    border-radius: 18px 24px 24px 24px;
    box-shadow: inset 0 0 12px rgba(68, 71, 90, 0.06);
}

.message.assistant.terminal .message-content::before {
    content: " ";
    display: block;
    margin-bottom: 6px;
    height: 1px;
    background: rgba(68, 71, 90, 0.12);
}

.message.assistant.terminal .message-content pre {
    margin: 0;
    font-family: inherit;
    line-height: 1.55;
    color: #f8f8f2;
}

/* Token colors (synth-wave / Monokai-inspired) */
.message.assistant.terminal .tok-prompt { color: #ff79c6; }
.message.assistant.terminal .tok-action { color: #8be9fd; }
.message.assistant.terminal .tok-variable { color: #50fa7b; }
.message.assistant.terminal .tok-status { color: #ffb86c; }

.message.assistant.terminal .terminal-line { display: block; }

/* Centered system terminal message */
.message.terminal {
    align-self: center;
    justify-content: center;
}

.message.terminal .message-avatar {
    display: none;
}

.message.terminal .message-content {
    margin: 0 auto;
    max-width: 760px;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: #4285f4;
    color: white;
}

.message.assistant .message-avatar {
    background: #1f62da;
    color: white;
}

/* Chat Input Area */
.chat-input-area {
    padding: 20px;
    border-top: 1px solid #3c3c3c;
    flex-shrink: 0;
    background: #1a1a1a;
}

.chat-input-form {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
}

#chat-input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid #3c3c3c;
    border-radius: 24px;
    background: #262626;
    color: #e0e0e0;
    font-size: 0.95rem;
    resize: none;
    max-height: 120px;
    font-family: inherit;
    transition: all 0.2s ease;
    min-height: 44px;
}

#chat-input:focus {
    outline: none;
    border-color: #1f62da;
    background: #2d2d2d;
}

#chat-input::placeholder {
    color: #999999;
}

.send-btn {
    padding: 12px 16px;
    border: none;
    border-radius: 24px;
    background: #1f62da;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
    flex-shrink: 0;
    min-width: 44px;
    min-height: 44px;
}

.send-btn:hover {
    background: #1552ba;
}

.send-btn:disabled {
    background: #3c3c3c;
    cursor: not-allowed;
    color: #999999;
}

.footer-disclaimer {
    margin: 0;
    color: #999999;
    font-size: 0.75rem;
    text-align: center;
}

/* Hide hamburger on desktop; keep it on mobile/tablet */
@media (min-width: 769px) {
    #menu-toggle {
        display: none;
    }
}

/* Tablet & Mobile Responsive */
@media (max-width: 1024px) {
    .sidebar {
        width: 240px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        width: 260px;
        position: absolute;
        left: 0;
        top: 56px;
        height: calc(100vh - 56px);
        z-index: 1000;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        border-right: 1px solid rgba(255, 255, 255, 0.08);
        margin-top: 0;

        /* keep glass look on mobile */
        background: rgba(15, 20, 30, 0.78);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
    }


    .sidebar.open {
        transform: translateX(0);
    }

    .chat-container {
        width: 100%;
        margin-top: 56px;
    }


    .chat-header {
        padding: 16px 16px 16px 50px;
    }

    .sidebar-mobile-header {
        display: flex;
    }


    .chat-header h1 {
        font-size: 1.5rem;
    }

    .greeting-panel {
        padding: 40px 20px;
    }

    .greeting-panel h2 {
        font-size: 1.8rem;
    }

    .message {
        max-width: 95%;
    }

    .chat-messages {
        padding: 16px;
        gap: 16px;
    }

    .chat-input-area {
        padding: 16px;
    }

    #chat-input {
        font-size: 16px;
    }

    .message-content {
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    .topbar {
        padding: 0 10px;
    }

    .topbar-btn-text {
        display: none;
    }

    .chat-header {
        padding: 12px 12px;
    }


    .chat-header h1 {
        font-size: 1.2rem;
    }

    .greeting-panel h2 {
        font-size: 1.4rem;
    }

    .chat-messages {
        padding: 12px 8px;
        gap: 12px;
    }

    .message {
        max-width: 100%;
    }

    .chat-input-area {
        padding: 12px 8px;
    }

    .chat-input-form {
        gap: 8px;
        margin-bottom: 8px;
    }

    #chat-input {
        padding: 10px 12px;
        font-size: 16px;
        min-height: 40px;
    }

    .send-btn {
        padding: 10px 12px;
        min-width: 40px;
        min-height: 40px;
    }

    .send-btn svg {
        width: 18px;
        height: 18px;
    }

    .message-avatar {
        width: 28px;
        height: 28px;
        font-size: 0.8rem;
    }

    .message-content {
        padding: 10px 12px;
        font-size: 0.9rem;
        border-radius: 18px;
    }

    .message.user .message-content {
        border-radius: 18px 2px 18px 18px;
    }

    .message.assistant .message-content {
        border-radius: 2px 18px 18px 18px;
    }

    .footer-disclaimer {
        font-size: 0.7rem;
    }
}