/* === FONT & GLOBAL RESET === */
:root {
    --primary-bg: #ffffff; --secondary-bg: #f7f7f8; --primary-text: #1a1a1a; --secondary-text: #555555;
    --border-color: #e0e0e0; --accent-blue-light: #007bff; --accent-blue-dark: #0056b3;
    --bubble-bg-user: #007bff; --bubble-text-user: #ffffff; --code-bg: #1d1f21;
    --header-bg: rgba(255, 255, 255, 0.85); --shadow-color: rgba(0, 0, 0, 0.1);
    --sidebar-bg: #f0f2f5; --sidebar-hover-bg: #e4e6e9; --danger-color: #dc3545;
}
[data-theme="dark"] {
    --primary-bg: #121212; --secondary-bg: #1e1e1e; --primary-text: #e0e0e0; --secondary-text: #a0a0a0;
    --border-color: #333333; --accent-blue-light: #3b9dff; --accent-blue-dark: #1e88e5;
    --bubble-bg-user: #3b9dff; --bubble-text-user: #ffffff; --header-bg: rgba(30, 30, 30, 0.85);
    --shadow-color: rgba(255, 255, 255, 0.05); --sidebar-bg: #181a1b; --sidebar-hover-bg: #2d3032;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { height: 100%; }
body { font-family: 'Inter', sans-serif; background-color: var(--primary-bg); color: var(--primary-text); transition: background-color 0.3s, color 0.3s; line-height: 1.6; }
a { color: var(--accent-blue-light); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 800px; margin: 0 auto; padding: 20px; }
body:not(:has(#app-wrapper)) > header, body:not(:has(#app-wrapper)) > footer { background-color: var(--secondary-bg); border-bottom: 1px solid var(--border-color); padding: 15px 0; transition: background-color 0.3s, border-color 0.3s; }
body:not(:has(#app-wrapper)) > footer { border-bottom: none; border-top: 1px solid var(--border-color); text-align: center; margin-top: 40px; }
.header-content { display: flex; justify-content: space-between; align-items: center; }
h1, h2, h3 { color: var(--primary-text); margin-bottom: 10px; }
.theme-switcher { display: flex; align-items: center; gap: 8px; color: var(--secondary-text); }
.switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #ccc; transition: .4s; }
.slider:before { position: absolute; content: ""; height: 18px; width: 18px; left: 3px; bottom: 3px; background-color: white; transition: .4s; }
input:checked + .slider { background-color: var(--accent-blue-light); }
input:checked + .slider:before { transform: translateX(20px); }
.slider.round { border-radius: 34px; }
.slider.round:before { border-radius: 50%; }
.intro { text-align: center; padding: 40px 0; }

.main-logo {
    width: 180px;
    height: 180px;
    object-fit: contain;
    background-color: transparent;
    border-radius: 50%;
    box-shadow: 0 4px 15px var(--shadow-color);
    margin-bottom: 30px;
    transition: transform 0.3s ease;
}

.main-logo:hover {
    transform: scale(1.05);
}
.cta-button { display: inline-block; background-color: var(--accent-blue-light); color: white; padding: 12px 25px; border-radius: 8px; font-weight: 500; margin-top: 20px; transition: background-color 0.3s, transform 0.2s; }
.cta-button:hover { background-color: var(--accent-blue-dark); transform: translateY(-2px); box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3); }
.info-section { background-color: var(--secondary-bg); padding: 20px; border-radius: 8px; margin-bottom: 20px; border: 1px solid var(--border-color); }
.info-section h3 { border-bottom: 2px solid var(--accent-blue-light); padding-bottom: 5px; display: inline-block; }
.info-section ul { padding-left: 20px; }
.info-section code { background-color: var(--border-color); padding: 2px 5px; border-radius: 4px; font-family: 'Courier New', Courier, monospace; }
.developer-info p { margin-bottom: 5px; }
.social-icons { margin-top: 15px; }
.social-icons a { color: var(--secondary-text); font-size: 24px; margin: 0 10px; transition: color 0.3s; }
.social-icons a:hover { color: var(--accent-blue-light); }

#app-wrapper { display: flex; height: 100vh; }
#sidebar { width: 260px; background-color: var(--sidebar-bg); flex-shrink: 0; display: flex; flex-direction: column; padding: 10px; border-right: 1px solid var(--border-color); transition: margin-left 0.3s ease; }
#sidebar-overlay { display: none; position: fixed; inset: 0; background-color: rgba(0,0,0,0.5); z-index: 99; }
.sidebar-header { padding-bottom: 10px; }
.sidebar-new-chat-btn { width: 100%; padding: 10px; background-color: var(--accent-blue-light); color: white; border: none; border-radius: 8px; font-size: 1em; cursor: pointer; transition: background-color 0.2s; }
.sidebar-new-chat-btn:hover { background-color: var(--accent-blue-dark); }
.sidebar-new-chat-btn:disabled { background-color: var(--secondary-text); cursor: not-allowed; }
.session-list { flex-grow: 1; overflow-y: auto; }
.session-item { display: flex; align-items: center; justify-content: space-between; padding: 10px; border-radius: 8px; margin-top: 5px; cursor: pointer; transition: background-color 0.2s; }
.session-item:hover { background-color: var(--sidebar-hover-bg); }
.session-item.active { background-color: var(--accent-blue-dark); color: white; }
.session-item-title { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; flex-grow: 1; margin-right: 10px; }
.session-item-delete-btn { background: none; border: none; color: var(--secondary-text); cursor: pointer; font-size: 1em; opacity: 0; transition: opacity 0.2s; }
.session-item:hover .session-item-delete-btn { opacity: 1; }
.session-item.active .session-item-delete-btn { color: white; }
.session-item-delete-btn:hover { color: var(--danger-color); }
#chat-main-content { flex-grow: 1; display: flex; flex-direction: column; }
.chat-layout { display: flex; flex-direction: column; height: 100vh; background-color: var(--primary-bg); }
.chat-header { display: flex; justify-content: space-between; align-items: center; padding: 10px 20px; background-color: var(--header-bg); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--border-color); z-index: 10; flex-shrink: 0;}
.header-left, .header-right { display: flex; align-items: center; gap: 15px; }

.header-logo {
    height: 40px;
    width: 40px;
    object-fit: cover;
    border-radius: 50%;
    border: 2px solid var(--accent-blue-light);
    box-shadow: 0 2px 5px var(--shadow-color);
    flex-shrink: 0;
}
.header-button { background: none; border: none; font-size: 18px; cursor: pointer; color: var(--secondary-text); transition: color 0.3s;}
#menu-toggle-btn { display: none; }
main.chat-container { flex-grow: 1; overflow-y: auto; padding: 20px; }
.chat-messages { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
@keyframes pop-in {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}
.message { display: flex; flex-direction: column; max-width: 100%; }
.message.user { align-items: flex-end; }
.message.assistant { align-items: flex-start; }
.message-content { padding: 12px 18px; border-radius: 18px; word-break: break-word; }
.message.user .message-content {
    background-color: var(--bubble-bg-user);
    color: var(--bubble-text-user);
    border-bottom-right-radius: 4px;
    white-space: pre-wrap;
    animation: pop-in 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.message.assistant .message-content { background-color: transparent; padding: 0; width: 100%; }
.message.assistant .message-content p:last-child { margin-bottom: 0; }
.typing-indicator { display: flex; align-items: center; gap: 5px; padding: 12px 18px; }
.typing-indicator span { width: 8px; height: 8px; background-color: var(--secondary-text); border-radius: 50%; animation: bounce 1.4s infinite ease-in-out both; }
.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }
@keyframes bounce { 0%, 80%, 100% { transform: scale(0); } 40% { transform: scale(1.0); } }

.weather-card {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    padding: 20px;
    border-radius: 20px;
    margin: 15px 0;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    animation: pop-in 0.4s ease-out;
}
[data-theme="dark"] .weather-card {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
}
.weather-grid { 
    display: grid; 
    grid-template-columns: repeat(3, 1fr); 
    gap: 10px; 
    background: rgba(255,255,255,0.15); 
    padding: 12px; 
    border-radius: 15px; 
    margin-top: 15px;
}
.weather-item { text-align: center; }
.weather-item span { display: block; font-size: 0.75rem; opacity: 0.8; }
.weather-item strong { font-size: 1rem; }

.chat-input-area-wrapper { position: sticky; bottom: 0; padding-top: 10px; background: linear-gradient(to top, var(--primary-bg) 70%, transparent 100%); flex-shrink: 0; }
.chat-input-area { max-width: 800px; margin: 0 auto; padding: 0 20px 10px; display: flex; align-items: flex-end; gap: 10px; background-color: var(--primary-bg); }
#message-input { flex-grow: 1; padding: 12px 15px; border: 1px solid var(--border-color); border-radius: 22px; background-color: var(--secondary-bg); color: var(--primary-text); font-size: 16px; resize: none; overflow-y: auto; }
#message-input:focus { outline: none; border-color: var(--accent-blue-light); box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25); }
#send-button { width: 44px; height: 44px; border: none; border-radius: 50%; background-color: var(--accent-blue-light); color: white; font-size: 18px; cursor: pointer; flex-shrink: 0; display: flex; justify-content: center; align-items: center; transition: background-color 0.3s; }
.api-disclaimer { font-size: 0.75rem; color: var(--secondary-text); text-align: center; padding-bottom: 5px; max-width: 800px; margin: 0 auto; background-color: var(--primary-bg); }

.code-wrapper { background-color: var(--secondary-bg); border-radius: 12px; border: 1px solid var(--border-color); margin: 1em 0; overflow: hidden; }
.code-header { display: flex; justify-content: space-between; align-items: center; padding: 8px 15px; background-color: var(--sidebar-hover-bg); border-bottom: 1px solid var(--border-color); color: var(--secondary-text); font-size: 0.85em; }
.code-copy-btn { background-color: transparent; border: none; color: var(--secondary-text); cursor: pointer; padding: 4px; border-radius: 4px; display: flex; align-items: center; gap: 5px; }
.code-copy-btn:hover { background-color: var(--border-color); }
.code-wrapper pre { margin: 0; background-color: var(--code-bg); white-space: pre-wrap; word-wrap: break-word; }
.code-wrapper pre code.hljs { padding: 15px; font-size: 0.9em; line-height: 1.5; }

@media (max-width: 768px) {
    #sidebar { position: fixed; left: -260px; top: 0; height: 100%; z-index: 100; margin-left: 0; transition: left 0.3s ease; }
    #sidebar.open { left: 0; }
    #sidebar-overlay.open { display: block; }
    #menu-toggle-btn { display: block; }
    .chat-header h2 { font-size: 1.2em; }
    .chat-input-area { padding: 0 10px 10px; }
}

@media (min-width: 769px) {
    #sidebar, #app-wrapper {
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    #sidebar.closed {
        width: 0; padding: 0; margin: 0; border-right: none; opacity: 0; overflow: hidden; pointer-events: none;
    }

    #app-wrapper.sidebar-closed #chat-main-content {
        flex-grow: 1; width: 100%;
    }
}

#menu-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
}

@media (max-width: 768px) {
    #sidebar.closed {
        width: 260px; opacity: 1; pointer-events: auto;
    }
}