* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --sidebar-bg: #f8f9fa;
    --sidebar-width: 280px;
    --primary-color: #1a73e8;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --hover-bg: #e8eaed;
    --border-color: #dadce0;
    --input-bg: #f1f3f4;
    --white: #ffffff;
}

body {
    font-family: 'Google Sans', 'Roboto', Arial, sans-serif;
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    overflow: hidden;
    background-color: var(--white);
}


.material-symbols-outlined {
    font-variation-settings:
    'FILL' 0,
    'wght' 400,
    'GRAD' 0,
    'opsz' 24;
    font-size: 20px;
    position: relative;
    top: -2px; 
}


.sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    padding: 8px;
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
}

.sidebar-header {
    padding: 8px;
    margin-bottom: 8px;
}

.menu-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    font-size: 20px;
    color: var(--text-secondary);
    transition: background-color 0.2s;
}

.menu-btn:hover {
    background-color: var(--hover-bg);
}

.menu-btn .material-symbols-outlined {
    font-size: 24px;
    top: 0;
}


.new-chat {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
}

.new-chat-btn {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.new-chat-btn:hover {
    background-color: var(--hover-bg);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.expand-btn {
    padding: 12px;
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    transition: background-color 0.2s;
}

.expand-btn:hover {
    background-color: var(--hover-bg);
}

.expand-btn .material-symbols-outlined {
    top: 0;
}


.gems-section {
    margin-bottom: 16px;
}

.gems-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    background: none;
    border: none;
    border-radius: 24px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    transition: background-color 0.2s;
}

.gems-btn:hover {
    background-color: var(--hover-bg);
}


.recent-section {
    flex: 1;
    overflow-y: auto;
}

.recent-section h3 {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    padding: 12px 16px 8px;
}

.recent-list {
    list-style: none;
}

.recent-list li {
    margin-bottom: 2px;
}

.recent-list a {
    display: block;
    padding: 10px 16px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    border-radius: 24px;
    transition: background-color 0.2s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.recent-list a:hover {
    background-color: var(--hover-bg);
}


.recent-list a.active-link {
    background-color: #e6eaf0; 
    font-weight: 500;
    color: var(--text-primary);
}



.sidebar-footer {
    margin-top: auto;
    padding-top: 16px;
}

.settings-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    background: none;
    border: none;
    border-radius: 24px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    transition: background-color 0.2s;
}

.settings-btn:hover {
    background-color: var(--hover-bg);
}


.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--white);
    overflow: hidden;
}


.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    border-bottom: 1px solid var(--border-color);
}

.top-bar-left,
.top-bar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.search-btn,
.theme-toggle-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    font-size: 20px;
    color: var(--text-secondary);
    transition: background-color 0.2s;
}

.search-btn:hover,
.theme-toggle-btn:hover {
    background-color: var(--hover-bg);
}

.search-btn .material-symbols-outlined,
.theme-toggle-btn .material-symbols-outlined {
    font-size: 24px;
    top: 0;
}


.logo {
    font-size: 22px;
    font-weight: 400;
    color: var(--text-secondary);
}

.upgrade-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-primary);
    transition: all 0.2s;
}

.upgrade-btn:hover {
    background-color: var(--hover-bg);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.upgrade-btn .material-symbols-outlined {
    font-size: 18px;
}

.profile-pic {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
}

.profile-pic img {
    width: 100%;
    height: 100%;
    object-fit: cover; 
}


.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 32px;
    overflow-y: auto;
}

.welcome-message {
    margin-bottom: 48px;
}

.welcome-message h2 {
    font-size: 48px;
    font-weight: 400;
    color: var(--primary-color);
    text-align: center;
}


.input-container {
    width: 100%;
    max-width: 880px;
}

.input-box {
    background-color: var(--input-bg);
    border-radius: 32px;
    padding: 16px 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.chat-input {
    background: none;
    border: none;
    outline: none;
    font-size: 16px;
    color: var(--text-primary);
    width: 100%;
}

.chat-input::placeholder {
    color: var(--text-secondary);
}

.input-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.action-btn,
.tools-btn,
.version-selector,
.mic-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 16px;
    font-size: 14px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: background-color 0.2s;
}

.action-btn:hover,
.tools-btn:hover,
.version-selector:hover,
.mic-btn:hover {
    background-color: var(--hover-bg);
}

.action-btn .material-symbols-outlined,
.mic-btn .material-symbols-outlined {
    top: 0;
}

.version-selector {
    margin-left: auto;
}


@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -280px; 
        top: 0;
        bottom: 0;
        z-index: 1000;
        transition: left 0.3s ease;
    }

    .sidebar.open {
        left: 0; 
    }

    .top-bar {
        padding: 12px 16px;
    }

    .upgrade-btn .text {
        display: none; 
    }

    .welcome-message h2 {
        font-size: 32px;
    }

    .input-box {
        padding: 12px 16px;
    }

    .tools-btn .text,
    .version-selector .text {
        display: none; 
    }
}