:root {
    --primary-color: #1a1a1a;
    --secondary-color: #2a2a2a;
    --accent-color: #3a3a3a;
    --text-color: #ffffff;
    --border-color: rgba(255, 255, 255, 0.1);
    --gradient-start: #1a1a1a;
    --gradient-end: #2a2a2a;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: var(--text-color);
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 2rem;
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #66ff33, #00ff99);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.chat-container {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 2rem;
    height: calc(100vh - 16rem);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    padding: 1rem 1.5rem;
    border-radius: 20px;
    max-width: 80%;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
}

.message:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.user-message {
    margin-left: auto;
    background: linear-gradient(135deg, #66ff33, #00ff99);
    color: var(--text-color);
}

.bot-message {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
}

.input-container {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

textarea {
    flex: 1;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 15px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    resize: none;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: #66ff33;
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 0 2px rgba(102, 255, 51, 0.2);
}

button {
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #66ff33, #00ff99);
    color: var(--text-color);
    border: none;
    border-radius: 15px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
    background: linear-gradient(135deg, #00ff99, #66ff33);
}

button:active {
    transform: translateY(0);
}

/* Loading animation */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: "";
    position: absolute;
    right: 1rem;
    width: 1rem;
    height: 1rem;
    border: 2px solid transparent;
    border-radius: 50%;
    border-top-color: #66ff33;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}