Create style.css

style.css

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+:root {
+    --bg-dark: #131314;
+    --bg-sidebar: #1e1f20;
+    --bg-card: #1e1f20;
+    --text-main: #e3e3e3;
+    --text-sub: #e3e3e380;
+    --gemini-blue: #4285f4;
+    --gemini-purple: #9b51e0;
+}
+
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+    font-family: 'Google Sans', sans-serif;
+}
+
+body {
+    background-color: var(--bg-dark);
+    color: var(--text-main);
+    overflow: hidden;
+}
+
+.gemini-app {
+    display: flex;
+    height: 100vh;
+    width: 100vw;
+}
+
+/* সাইডবার স্টাইল */
+.sidebar {
+    width: 250px;
+    background-color: var(--bg-sidebar);
+    padding: 20px 12px;
+    display: flex;
+    flex-direction: column;
+    transition: all 0.3s ease;
+    z-index: 100;
+}
+
+.sidebar.closed {
+    width: 0;
+    padding: 20px 0;
+    overflow: hidden;
+}
+
+.new-chat-btn {
+    background: #1a1a1c;
+    border: none;
+    color: var(--text-main);
+    padding: 12px 16px;
+    border-radius: 50px;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    font-weight: 500;
+    margin-top: 20px;
+    width: fit-content;
+}
+
+.recent-section {
+    margin-top: 30px;
+    flex: 1;
+    overflow-y: auto;
+}
+
+.recent-title {
+    font-size: 14px;
+    color: var(--text-sub);
+    padding-left: 14px;
+    margin-bottom: 10px;
+}
+
+.history-item {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 10px 14px;
+    border-radius: 20px;
+    cursor: pointer;
+    font-size: 14px;
+    color: var(--text-main);
+}
+
+.history-item:hover { background-color: #282a2c; }
+
+.delete-chat-btn {
+    background: none;
+    border: none;
+    color: var(--text-sub);
+    cursor: pointer;
+    display: none;
+}
+
+.history-item:hover .delete-chat-btn { display: block; }
+
+/* মেইন কন্টেন্ট */
+.main-content {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    position: relative;
+    background-color: var(--bg-dark);
+}
+
+.top-bar {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 16px 24px;
+}
+
+.menu-toggle, .menu-toggle-inner {
+    background: none;
+    border: none;
+    color: var(--text-main);
+    font-size: 20px;
+    cursor: pointer;
+}
+
+.app-brand {
+    font-size: 22px;
+    font-weight: 500;
+    background: linear-gradient(45deg, #4285f4, #9b51e0, #ea4335);
+    -webkit-background-clip: text;
+    -webkit-text-fill-color: transparent;
+}
+
+.user-avatar {
+    font-size: 20px;
+    cursor: pointer;
+}
+
+/* চ্যাট কন্টেইনার ও ওয়েলকাম স্ক্রিন */
+.chat-container {
+    flex: 1;
+    overflow-y: auto;
+    padding: 20px 10%;
+    display: flex;
+    flex-direction: column;
+}
+
+.welcome-screen {
+    margin-top: 8vh;
+}
+
+.gemini-greeting {
+    font-size: 56px;
+    font-weight: 500;
+    background: linear-gradient(90deg, #4285f4, #9b51e0);
+    -webkit-background-clip: text;
+    -webkit-text-fill-color: transparent;
+}
+
+.gemini-sub-greeting {
+    font-size: 56px;
+    color: #333537;
+    margin-bottom: 40px;
+}
+
+.suggestion-cards {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
+    gap: 16px;
+}
+
+.card {
+    background-color: var(--bg-card);
+    padding: 20px;
+    border-radius: 12px;
+    cursor: pointer;
+    min-height: 120px;
+    display: flex;
+    align-items: flex-end;
+    transition: background 0.2s;
+}
+
+.card:hover { background-color: #282a2c; }
+
+.card p { font-size: 14px; color: var(--text-main); }
+
+/* চ্যাট মেসেজ বাবল */
+.chat-messages {
+    display: flex;
+    flex-direction: column;
+    gap: 30px;
+    padding-bottom: 100px;
+}
+
+.chat-bubble {
+    display: flex;
+    gap: 20px;
+    animation: fadeIn 0.4s ease;
+}
+
+.chat-bubble.user { justify-content: flex-end; flex-direction: row-reverse;}
+
+.bubble-avatar { width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: #282a2c; }
+.chat-bubble.user .bubble-avatar { background: var(--gemini-blue); }
+
+.bubble-text {
+    max-width: 80%;
+    font-size: 16px;
+    line-height: 1.6;
+    color: var(--text-main);
+    word-break: break-word;
+}
+
+.chat-bubble.user .bubble-text {
+    background-color: #282a2c;
+    padding: 12px 20px;
+    border-radius: 22px;
+}
+
+/* বটম ইনপুট এরিয়া */
+.input-area-container {
+    position: absolute;
+    bottom: 0;
+    left: 0;
+    width: 100%;
+    padding: 20px 10%;
+    background: linear-gradient(transparent, var(--bg-dark) 30%);
+}
+
+.input-box-wrapper {
+    display: flex;
+    background-color: var(--bg-card);
+    border-radius: 30px;
+    padding: 8px 24px;
+    align-items: center;
+}
+
+#userInput {
+    flex: 1;
+    background: none;
+    border: none;
+    color: var(--text-main);
+    font-size: 16px;
+    outline: none;
+    padding: 12px 0;
+}
+
+#sendBtn {
+    background: none;
+    border: none;
+    cursor: pointer;
+}
+
+.send-icon {
+    width: 24px;
+    height: 24px;
+    fill: var(--text-main);
+    transition: fill 0.2s;
+}
+
+#userInput:placeholder-shown + #sendBtn .send-icon { fill: var(--text-sub); }
+
+.disclaimer {
+    font-size: 12px;
+    color: var(--text-sub);
+    text-align: center;
+    margin-top: 10px;
+}
+
+@keyframes fadeIn {
+    from { opacity: 0; transform: translateY(10px); }
+    to { opacity: 1; transform: translateY(0); }
+}
+
+/* মোবাইল রেসপন্সিভনেস */
+@media (max-width: 768px) {
+    .sidebar { position: absolute; height: 100%; left: 0; top: 0; }
+    .sidebar.closed { width: 0; transform: translateX(-100%); }
+    .chat-container { padding: 20px 5%; }
+    .input-area-container { padding: 20px 5%; }
+    .gemini-greeting, .gemini-sub-greeting { font-size: 36px; }
+}