Create css/styles.css

css/styles.css

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+: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;
+    }
+}