* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

:root {
    --sidebar-width: 300px;
    --emerald-primary: #00c897;
    --emerald-dark: #00946f;
    --emerald-light: #00ffbf;
    --dark-bg: #0a0a0a;
    --darker-bg: #050505;
    --chat-bg: #000000;
    --danger: #ff4444;
    --danger-hover: #ff0000;
    --user-message-bg: #1E1E1E;
    --ai-message-bg: #002419;
    --timestamp-color: #888;
}

body {
    background: var(--dark-bg);
    min-height: 100vh;
    display: flex;
    color: #fff;
}

.app-container {
    display: flex;
    width: 100%;
    height: 100vh;
    position: relative;
    overflow: hidden;
}

.logo-area {
    padding: 24px 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    background: rgba(0,0,0,0.2);
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--emerald-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    user-select: none;
}

.logo i {
    color: var(--emerald-primary);
    font-size: 28px;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--darker-bg);
    border-right: 1px solid rgba(255,255,255,0.05);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
    box-shadow: 5px 0 15px rgba(0,0,0,0.2);
}

.actions-container {
    padding: 16px;
    display: flex;
    gap: 8px;
}

.new-chat-btn {
    flex: 1;
    background: rgba(0,200,151,0.1);
    border: 1px solid rgba(0,200,151,0.2);
    color: var(--emerald-primary);
    padding: 12px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
    font-size: 14px;
    font-weight: 500;
}

.export-btn {
    width: 45px;
    background: rgba(0,200,151,0.1);
    border: 1px solid rgba(0,200,151,0.2);
    color: var(--emerald-primary);
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.new-chat-btn:hover, .export-btn:hover {
    background: rgba(0,200,151,0.15);
    border-color: var(--emerald-primary);
    transform: translateY(-1px);
}

.chat-item {
    padding: 12px 16px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s ease;
    font-size: 14px;
    color: rgba(255,255,255,0.7);
    margin: 4px 12px;
    position: relative;
}

.chat-item:hover {
    background: rgba(255,255,255,0.05);
}

.chat-item.active {
    background: rgba(0,200,151,0.1);
    color: var(--emerald-primary);
}

.delete-btn {
    position: absolute;
    right: 12px;
    opacity: 0;
    background: rgba(255,68,68,0.1);
    border: none;
    color: var(--danger);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    transform: translateX(10px);
}

.chat-item:hover .delete-btn {
    opacity: 1;
    transform: translateX(0);
}

.delete-btn:hover {
    background: rgba(255,68,68,0.2);
    color: var(--danger-hover);
}

.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    background: var(--chat-bg);
    position: relative;
}

.menu-toggle {
    display: none;
    position: absolute;
    top: 20px;
    left: 20px;
    background: none;
    border: none;
    color: var(--emerald-primary);
    font-size: 24px;
    cursor: pointer;
    z-index: 1000;
}

.message-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.message {
    padding: 16px 20px;
    max-width: 80%;
    animation: messageSlide 0.3s ease forwards;
    opacity: 0;
    transform: translateY(10px);
    margin: 4px 0;
    border-radius: 8px;
    color: #FFFFFF;
    line-height: 1.5;
}

.message.user {
    background: var(--user-message-bg);
    margin-left: auto;
    text-align: left;
}

.message.ai {
    background: var(--ai-message-bg);
    margin-right: auto;
    text-align: left;
}

.katex-display {
    margin: 1em 0;
    overflow-x: auto;
}

.katex {
    font-size: 1.1em;
}

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

.input-area {
    padding: 24px;
    background: rgba(0,0,0,0.3);
    backdrop-filter: blur(20px);
    border-top: 1px solid rgba(255,255,255,0.05);
}

.input-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    gap: 12px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    padding: 12px;
    transition: all 0.2s ease;
}

.input-container:focus-within {
    border-color: var(--emerald-primary);
    box-shadow: 0 0 0 2px rgba(0,200,151,0.1);
}

.message-input {
    flex: 1;
    background: none;
    border: none;
    color: #fff;
    font-size: 14px;
    resize: none;
    max-height: 200px;
    padding: 4px;
}

.message-input:focus {
    outline: none;
}

.send-btn {
    background: var(--emerald-primary);
    border: none;
    color: #fff;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.send-btn:hover {
    background: var(--emerald-dark);
    transform: scale(1.05);
}

.model-info {
    font-size: 12px;
    color: rgba(255,255,255,0.5);
    text-align: center;
    padding: 12px;
    border-top: 1px solid rgba(255,255,255,0.05);
    margin-top: auto;
}

.welcome-message {
    text-align: center;
    padding: 40px;
    color: rgba(255,255,255,0.7);
    font-size: 16px;
}

@media (max-width: 768px) {
    .sidebar {
        position: absolute;
        left: -100%;
        height: 100%;
        z-index: 1000;
        transition: left 0.3s ease;
    }

    .sidebar.active {
        left: 0;
    }

    .menu-toggle {
        display: block;
    }
}

.games-btn {
    width: 45px;
    background: rgba(0,200,151,0.1);
    border: 1px solid rgba(0,200,151,0.2);
    color: var(--emerald-primary);
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    text-decoration: none;
}

.games-btn:hover {
    background: rgba(0,200,151,0.15);
    border-color: var(--emerald-primary);
    transform: translateY(-1px);
    color: var(--emerald-primary);
}

.actions-container {
    padding: 16px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}