/* Modern Reset & Variables */
/* Back to Portfolio Button */
.btn-back-portfolio {
    position: fixed;
    top: 20px;
    right: 20px;
    /* Position right for this layout */
    z-index: 9999;
    background: rgba(45, 52, 54, 0.9);
    padding: 10px 20px;
    border-radius: 50px;
    text-decoration: none;
    color: #fff;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-back-portfolio:hover {
    transform: translateX(-5px);
    background: #6c5ce7;
    color: white;
}

@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css');

:root {
    /* Base Colors - Catppuccin Mocha Inspired */
    --bg-base: #1e1e2e;
    --bg-sidebar: #181825;
    --bg-surface: #313244;
    --bg-surface-hover: #45475a;

    /* Text Colors */
    --text-main: #cdd6f4;
    --text-sub: #a6adc8;
    --text-dim: #6c7086;

    /* Accents */
    --accent-algo: #cba6f7;
    /* Mauve */
    --accent-bbg: #89b4fa;
    /* Blue */
    --accent-danger: #f38ba8;
    --accent-success: #a6e3a1;

    /* Spacing & Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --trans-fast: 0.2s ease;
    --trans-med: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-base);
    color: var(--text-main);
    height: 100vh;
    display: flex;
    overflow: hidden;
    font-size: 16px;
    line-height: 1.5;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--bg-surface);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--bg-surface-hover);
}

/* --- Sidebar --- */
.sidebar {
    width: 280px;
    background-color: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    padding: 20px;
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--trans-med);
    z-index: 10;
}

.app-logo {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
    opacity: 0.9;
}

.new-chat-btn {
    background: linear-gradient(135deg, var(--accent-algo), #b4befe);
    color: #11111b;
    border: none;
    border-radius: var(--radius-md);
    padding: 14px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--trans-fast);
    box-shadow: 0 4px 12px rgba(203, 166, 247, 0.2);
    margin-bottom: 24px;
}

.new-chat-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(203, 166, 247, 0.3);
}

.history-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
    padding-left: 4px;
}

.history-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-right: -10px;
    padding-right: 10px;
}

.history-item {
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-sub);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--trans-fast);
    border: 1px solid transparent;
}

.history-item:hover {
    background-color: rgba(255, 255, 255, 0.03);
    color: var(--text-main);
}

.history-item.active {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
}

.history-title {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 180px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.delete-chat-btn {
    color: var(--text-dim);
    opacity: 0;
    transition: var(--trans-fast);
    padding: 6px;
    border-radius: 4px;
}

.history-item:hover .delete-chat-btn {
    opacity: 1;
}

.delete-chat-btn:hover {
    color: var(--accent-danger);
    background-color: rgba(243, 139, 168, 0.1);
}

.action-btn {
    margin-top: 10px;
    padding: 12px;
    color: var(--text-dim);
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--trans-fast);
    width: 100%;
}

.action-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    border-color: rgba(255, 255, 255, 0.1);
}

.clear-all-btn:hover {
    background-color: rgba(243, 139, 168, 0.1);
    color: var(--accent-danger);
    border-color: rgba(243, 139, 168, 0.2);
}

.download-btn:hover {
    background-color: rgba(166, 227, 161, 0.1);
    color: var(--accent-success);
    border-color: rgba(166, 227, 161, 0.2);
}

/* --- Main Content --- */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    background-color: var(--bg-base);
}

/* Mode Selector */
.mode-selector {
    display: flex;
    justify-content: center;
    padding: 20px;
    gap: 12px;
    background: linear-gradient(to bottom, var(--bg-base), transparent);
    z-index: 5;
}

.mode-btn {
    background: var(--bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-sub);
    padding: 10px 24px;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--trans-med);
    display: flex;
    align-items: center;
    gap: 8px;
}

.mode-btn:hover {
    background: var(--bg-surface-hover);
    color: var(--text-main);
}

.mode-btn.active-algo {
    background-color: rgba(203, 166, 247, 0.15);
    border-color: var(--accent-algo);
    color: var(--accent-algo);
    box-shadow: 0 0 15px rgba(203, 166, 247, 0.1);
}

.mode-btn.active-bbg {
    background-color: rgba(137, 180, 250, 0.15);
    border-color: var(--accent-bbg);
    color: var(--accent-bbg);
    box-shadow: 0 0 15px rgba(137, 180, 250, 0.1);
}

/* Chat Area */
.chat-box {
    flex: 1;
    padding: 20px 40px;
    overflow-y: auto;
    scroll-behavior: smooth;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.message {
    display: flex;
    gap: 18px;
    padding: 0 20px;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    animation: fadeIn 0.3s ease-out;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.avatar.user {
    background: linear-gradient(135deg, #cba6f7, #f5c2e7);
    color: #11111b;
}

.avatar.ai {
    background: var(--bg-surface);
    color: var(--text-main);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.msg-content {
    padding: 16px 20px;
    border-radius: var(--radius-lg);
    background-color: var(--bg-surface);
    color: var(--text-main);
    line-height: 1.6;
    font-size: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    max-width: 80%;
}

.user-message .msg-content {
    background-color: rgba(203, 166, 247, 0.1);
    /* Slight tint for user */
    border: 1px solid rgba(203, 166, 247, 0.2);
    border-top-right-radius: 4px;
}

.ai-message .msg-content {
    background-color: transparent;
    box-shadow: none;
    padding: 10px 0;
    max-width: 100%;
}

/* Markdown Styles */
.msg-content pre {
    background: #11111b !important;
    padding: 16px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 16px 0;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.msg-content code {
    font-family: 'JetBrains Mono', 'Consolas', monospace;
    font-size: 0.9em;
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
}

.msg-content pre code {
    background: transparent;
    padding: 0;
}

.msg-content p {
    margin-bottom: 12px;
}

.msg-content p:last-child {
    margin-bottom: 0;
}

/* Input Area */
.input-area {
    padding: 30px;
    background: linear-gradient(to top, var(--bg-base) 80%, transparent);
    display: flex;
    justify-content: center;
}

.input-wrapper {
    width: 100%;
    max-width: 900px;
    position: relative;
    display: flex;
    background-color: var(--bg-surface);
    border-radius: var(--radius-lg);
    padding: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transition: var(--trans-fast);
}

.input-wrapper:focus-within {
    border-color: var(--accent-algo);
    box-shadow: 0 4px 24px rgba(203, 166, 247, 0.15);
}

input[type="text"] {
    width: 100%;
    padding: 12px 16px;
    padding-right: 50px;
    background-color: transparent;
    border: none;
    color: var(--text-main);
    font-size: 1rem;
    outline: none;
}

input[type="text"]::placeholder {
    color: var(--text-dim);
}

button.send-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--accent-algo);
    color: #11111b;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--trans-fast);
    margin-left: 8px;
}

button.send-btn:hover {
    transform: scale(1.05);
    background: #d8bbf9;
}

button.send-btn:disabled {
    background: var(--bg-surface-hover);
    color: var(--text-dim);
    cursor: not-allowed;
    transform: none;
}

/* Responsive */
.menu-toggle {
    display: none;
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 20;
    background: var(--bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    padding: 10px;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .sidebar {
        position: absolute;
        height: 100%;
        transform: translateX(-100%);
        box-shadow: 5px 0 15px rgba(0, 0, 0, 0.5);
    }

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

    .main-content {
        padding-top: 60px;
        /* Space for toggle */
    }

    .mode-selector {
        padding-top: 0;
    }

    .message {
        padding: 0;
    }

    .msg-content {
        max-width: 90%;
    }
}

/* --- Copy Button --- */
.code-header {
    display: flex;
    justify-content: flex-end;
    background: #2b2d31;
    padding: 5px 10px;
    border-top-left-radius: var(--radius-md);
    border-top-right-radius: var(--radius-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.copy-btn {
    background: transparent;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: var(--trans-fast);
}

.copy-btn:hover {
    color: var(--text-main);
}

.msg-content pre {
    margin-top: 0;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}