* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background: #0b1120;
    color: white;
}

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

/* Sidebar */

.sidebar {
    width: 260px;
    background: #111c32;
    padding: 25px 18px;
    display: flex;
    flex-direction: column;
}

.sidebar h2 {
    color: #60a5fa;
    font-size: 27px;
}

.tagline {
    color: #94a3b8;
    font-size: 12px;
    margin-top: 6px;
    margin-bottom: 30px;
}

.new-chat {
    background: #2563eb;
    border: none;
    padding: 13px;
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    margin-bottom: 30px;
}

.sidebar h4 {
    color: #64748b;
    font-size: 11px;
    letter-spacing: 1px;
    margin-bottom: 15px;
}

.topic {
    background: transparent;
    border: none;
    color: #cbd5e1;
    padding: 13px 10px;
    text-align: left;
    border-radius: 7px;
    cursor: pointer;
    font-size: 14px;
}

.topic:hover {
    background: #1e3a5f;
    color: white;
}

.sidebar-footer {
    margin-top: auto;
    color: #94a3b8;
    font-size: 12px;
    line-height: 22px;
}

/* Main area */

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.header {
    height: 85px;
    padding: 20px 35px;
    border-bottom: 1px solid #26344b;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header h2 {
    font-size: 20px;
}

.header p {
    color: #94a3b8;
    font-size: 12px;
    margin-top: 5px;
}

.status {
    color: #86efac;
    font-size: 13px;
}

.status span {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    margin-right: 5px;
}

/* Chat area */

.chat-area {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

.welcome {
    max-width: 650px;
    margin: 80px auto 0;
    text-align: center;
}

.welcome-icon {
    font-size: 55px;
    margin-bottom: 20px;
}

.welcome h1 {
    font-size: 32px;
    margin-bottom: 15px;
}

.welcome p {
    color: #94a3b8;
    line-height: 1.7;
    font-size: 14px;
}

.suggestions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 30px;
}

.suggestions button {
    background: #17243a;
    border: 1px solid #30415b;
    color: #cbd5e1;
    padding: 17px 12px;
    border-radius: 10px;
    cursor: pointer;
}

.suggestions button:hover {
    border-color: #3b82f6;
    background: #1e3a5f;
}

/* Messages */

.message {
    display: flex;
    margin-bottom: 22px;
    gap: 12px;
    max-width: 850px;
}

.message.user {
    justify-content: flex-end;
    margin-left: auto;
}

.avatar {
    width: 35px;
    height: 35px;
    min-width: 35px;
    background: #1d4ed8;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.message.user .avatar {
    background: #334155;
}

.bubble {
    background: #17243a;
    padding: 15px 18px;
    border-radius: 12px;
    line-height: 1.7;
    font-size: 14px;
    max-width: 80%;
    overflow-wrap: anywhere;
}

.message.user .bubble {
    background: #1d4ed8;
}

/* Input */

.input-section {
    padding: 20px 30px;
    border-top: 1px solid #26344b;
}

.input-box {
    display: flex;
    max-width: 900px;
    margin: auto;
    background: #17243a;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 7px;
}

.input-box input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: white;
    padding: 12px;
    font-size: 14px;
    min-width: 0;
}

.input-box button {
    background: #2563eb;
    color: white;
    border: none;
    padding: 0 22px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 20px;
}

.input-box button:hover {
    background: #1d4ed8;
}

.disclaimer {
    text-align: center;
    color: #64748b;
    font-size: 11px;
    margin-top: 12px;
}

/* Mobile responsive */

@media(max-width: 700px) {
    .sidebar {
        width: 75px;
        padding: 15px 8px;
    }

    .sidebar h2 {
        font-size: 13px;
    }

    .tagline,
    .sidebar h4,
    .sidebar-footer,
    .new-chat {
        display: none;
    }

    .topic {
        font-size: 11px;
        padding: 12px 3px;
        text-align: center;
    }

    .header {
        padding: 15px;
    }

    .header h2 {
        font-size: 16px;
    }

    .chat-area {
        padding: 15px;
    }

    .welcome {
        margin-top: 45px;
    }

    .welcome h1 {
        font-size: 24px;
    }

    .suggestions {
        grid-template-columns: 1fr;
    }

    .input-section {
        padding: 12px;
    }
}