:root {
    --bg-primary: #050505;
    --bg-secondary: #0f0f0f;
    --accent-cyan: #00f2ff;
    --accent-purple: #bc13fe;
    --text-primary: #ffffff;
    --text-secondary: #a3a3a3;
    --border-color: rgba(255, 255, 255, 0.08);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
}

canvas#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* Animations */
.fade-in {
    animation: fadeIn 0.8s ease-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Navbar */
nav {
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Forms */
.auth-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 40px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
}

input {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: white;
    border-radius: 8px;
}

button {
    width: 100%;
    padding: 12px;
    background: var(--accent-cyan);
    border: none;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
}

button:hover {
    box-shadow: 0 0 15px var(--accent-cyan);
    transform: translateY(-2px);
}

/* Chat UI */
.chat-wrapper {
    display: flex;
    height: calc(100vh - 80px);
}

.sidebar {
    width: 260px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 20px;
}

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

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 40px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.message {
    max-width: 80%;
    padding: 16px;
    border-radius: 12px;
    line-height: 1.6;
}

.message.user {
    align-self: flex-end;
    background: rgba(0, 242, 255, 0.1);
    border: 1px solid rgba(0, 242, 255, 0.2);
}

.message.assistant {
    align-self: flex-start;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
}

.input-area {
    padding: 40px;
    border-top: 1px solid var(--border-color);
}

.chat-input-wrapper {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

textarea {
    width: 100%;
    padding: 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: white;
    border-radius: 12px;
    resize: none;
    outline: none;
}