* {
    box-sizing: border-box;
}

body {
    margin: 0;
    height: 100vh;
    background: #0b0f19;
    color: white;
    font-family: Arial, sans-serif;
}

.app {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 280px;
    background: #111827;
    border-right: 1px solid #263044;
    padding: 20px;
}

.logo {
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 25px;
}

.logo small {
    display: block;
    font-size: 12px;
    color: #8b95a7;
}

.new-chat {
    width: 100%;
    padding: 12px;
    border-radius: 10px;
    border: 1px solid #374151;
    background: #1f2937;
    color: white;
    cursor: pointer;
}

.history {
    margin-top: 30px;
    color: #9ca3af;
}


.chat {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.header {
    padding: 18px;
    border-bottom: 1px solid #263044;
}

.header h2 {
    margin: 0;
}


.messages {
    flex: 1;
    padding: 25px;
    overflow-y: auto;
}


.message {
    max-width: 700px;
    padding: 14px 18px;
    border-radius: 14px;
    margin-bottom: 15px;
    line-height: 1.5;
}

.ai {
    background: #1f2937;
}

.user {
    background: #2563eb;
    margin-left: auto;
}


.input-area {
    display: flex;
    padding: 20px;
    border-top: 1px solid #263044;
    gap: 10px;
}

.input-area input {
    flex: 1;
    padding: 14px;
    border-radius: 10px;
    border: 1px solid #374151;
    background: #111827;
    color: white;
}

.input-area button {
    padding: 14px 22px;
    border-radius: 10px;
    border: none;
    background: #2563eb;
    color: white;
    cursor: pointer;
}