css/styles.css

:root {
    /* Light theme */
    --background: #ffffff;
    --foreground: #11181C;
    --muted: #687076;
    --accent: #0070f3;
    --border: #E6E8EB;
    --ring: #22222210;
    --surface: #fff;
    --surface-hover: #f3f4f6;
    --message-user: #ecfdf5;
    --message-bot: #f5f5f5;
    --shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
}

.dark {
    /* Dark theme */
    --background: #000000;
    --foreground: #FFFFFF;
    --muted: #A1A1AA;
    --accent: #3b82f6;
    --border: #27272A;
    --ring: #ffffff10;
    --surface: #18181B;
    --surface-hover: #27272A;
    --message-user: #064e3b;
    --message-bot: #18181B;
    --shadow: 0 1px 2px 0 rgb(0 0 0 / 0.1);
}

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

html {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}

body {
    background-color: var(--background);
    color: var(--foreground);
    line-height: 1.5;
    transition: background-color 0.3s ease;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    background-color: rgba(var(--background), 0.8);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-content h1 {
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

.icon-button {
    background: none;
    border: none;
    color: var(--foreground);
    padding: 0.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.icon-button:hover {
    background-color: var(--surface-hover);
}

.chat-container {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    padding: 5rem 1rem 1rem;
    display: flex;
    flex-direction: column;
}

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

.welcome-message {
    text-align: center;
    padding: 2rem;
}

.welcome-message h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.welcome-message p {
    color: var(--muted);
}

.message {
    max-width: 80%;
    padding: 1rem;
    border-radius: 0.75rem;
    animation: message-slide 0.3s ease;
}

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

.user-message {
    background-color: var(--message-user);
    align-self: flex-end;
    border-bottom-right-radius: 0.25rem;
}

.bot-message {
    background-color: var(--message-bot);
    align-self: flex-start;
    border-bottom-left-radius: 0.25rem;
}

.typing-indicator {
    padding: 1rem;
}

.typing-bubble {
    background-color: var(--message-bot);
    padding: 1rem;
    border-radius: 0.75rem;
    border-bottom-left-radius: 0.25rem;
    width: fit-content;
}

.dots {
    display: flex;
    gap: 0.25rem;
}

.dots span {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background-color: var(--muted);
    animation: bounce 1.4s infinite ease-in-out;
}

.dots span:nth-child(1) { animation-delay: -0.32s; }
.dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

.chat-input-container {
    position: sticky;
    bottom: 0;
    padding: 1rem;
    background-color: var(--background);
    border-top: 1px solid var(--border);
}

.input-wrapper {
    position: relative;
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--ring);
}

#user-input {
    background: none;
    border: none;
    color: var(--foreground);
    font-size: 1rem;
    resize: none;
    max-height: 200px;
    width: 100%;
}

#user-input:focus {
    outline: none;
}

.input-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.char-counter {
    font-size: 0.875rem;
    color: var(--muted);
}

.send-button {
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 0.5rem;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.toast-container {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    z-index: 100;
}

.toast {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1rem;
    box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.1);
    animation: toast-slide 0.3s ease;
}

@keyframes toast-slide {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.error {
    border-left: 4px solid #ef4444;
}

.toast.success {
    border-left: 4px solid #10b981;
}

.hidden {
    display: none;
}

/* Media Queries for Responsiveness */
@media (max-width: 768px) {
    .header-content h1 {
        font-size: 1.25rem;
    }

    .welcome-message h2 {
        font-size: 1.5rem;
    }

    .message {
        max-width: 90%;
    }
}

@media (max-width: 480px) {
    .chat-container {
        padding-top: 4rem;
    }

    .input-wrapper {
        padding: 0.5rem;
    }

    .send-button {
        padding: 0.5rem;
    }
}