: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; }
}