:root {
    --bg-color: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.75);
    --panel-border: rgba(255, 255, 255, 0.15);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-blue: #3b82f6;
    --accent-blue-hover: #2563eb;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --message-user: #3b82f6;
    --message-diet: #10b981;
    --message-fitness: #f59e0b;
    --message-system: #475569;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-container {
    display: flex;
    width: 95%;
    max-width: 1400px;
    height: 90vh;
    gap: 20px;
}

.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--panel-border);
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 300px;
    display: flex;
    flex-direction: column;
    padding: 24px;
    overflow-y: auto;
}

.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 10px; }

.profile-header {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
}

.settings-btn {
    margin-top: 10px;
    background: rgba(255,255,255,0.1);
    border: 1px solid var(--panel-border);
    color: white;
    padding: 6px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: background 0.2s;
}
.settings-btn:hover { background: rgba(255,255,255,0.2); }

.avatar {
    font-size: 48px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-green));
    width: 80px;
    height: 80px;
    line-height: 80px;
    border-radius: 50%;
    margin: 0 auto 12px;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.4);
}

.profile-header h2 { font-size: 1.2rem; font-weight: 600; }
.profile-header p { font-size: 0.9rem; color: var(--text-secondary); }

.data-section { margin-bottom: 24px; }
.data-section h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    border-bottom: 1px solid var(--panel-border);
    padding-bottom: 8px;
}

.data-list { list-style: none; font-size: 0.9rem; }
.data-list li, .data-list p {
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    margin-bottom: 6px;
    transition: all 0.2s ease;
}
.empty-state { color: var(--text-secondary); font-style: italic; background: transparent !important; }

/* Chat Container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.chat-header {
    padding: 24px;
    border-bottom: 1px solid var(--panel-border);
    background: rgba(15, 23, 42, 0.3);
}

.chat-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    background: linear-gradient(to right, #60a5fa, #34d399);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.chat-header p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.chat-messages {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.chat-messages::-webkit-scrollbar { width: 6px; }
.chat-messages::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 10px; }

.message {
    display: flex;
    flex-direction: column;
    max-width: 85%;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.message-bubble {
    padding: 14px 18px;
    border-radius: 18px;
    font-size: 0.95rem;
    line-height: 1.6;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.message-img {
    max-width: 100%;
    border-radius: 12px;
    margin-bottom: 8px;
}

.message.user { align-self: flex-end; }
.message.user .message-bubble { background: var(--message-user); color: white; border-bottom-right-radius: 4px; }
.message.system { align-self: flex-start; }
.message.system .message-bubble { background: var(--message-system); border-bottom-left-radius: 4px; }
.message.diet { align-self: flex-start; }
.message.diet .message-bubble { background: var(--panel-bg); border: 1px solid var(--message-diet); border-bottom-left-radius: 4px; }
.message.diet::before { content: "Diyet Koçu"; font-size: 0.75rem; color: var(--message-diet); margin-bottom: 4px; margin-left: 12px; font-weight: bold;}
.message.fitness { align-self: flex-start; }
.message.fitness .message-bubble { background: var(--panel-bg); border: 1px solid var(--message-fitness); border-bottom-left-radius: 4px; }
.message.fitness::before { content: "Fitness Koçu"; font-size: 0.75rem; color: var(--message-fitness); margin-bottom: 4px; margin-left: 12px; font-weight: bold;}

/* Input Area */
.chat-input-container {
    padding: 16px 20px;
    background: rgba(15, 23, 42, 0.6);
    border-top: 1px solid var(--panel-border);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

#image-preview-container {
    position: relative;
    display: inline-block;
    max-width: 100px;
}
#image-preview {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 12px;
    border: 2px solid var(--accent-blue);
}
#remove-image {
    position: absolute;
    top: -8px;
    right: 10px;
    background: red;
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    text-align: center;
    line-height: 18px;
    cursor: pointer;
    font-weight: bold;
}

.input-wrapper {
    display: flex;
    gap: 12px;
    align-items: center;
}

.upload-btn {
    font-size: 1.5rem;
    cursor: pointer;
    padding: 10px;
    background: rgba(255,255,255,0.05);
    border-radius: 12px;
    transition: background 0.2s;
    border: 1px solid var(--panel-border);
}
.upload-btn:hover { background: rgba(255,255,255,0.1); }

#chat-input {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--panel-border);
    padding: 14px 20px;
    border-radius: 12px;
    color: white;
    font-family: inherit;
    font-size: 1rem;
    outline: none;
    transition: all 0.2s;
}
#chat-input:focus { border-color: var(--accent-blue); }

.send-btn {
    background: var(--accent-blue);
    color: white;
    border: none;
    padding: 14px 24px;
    border-radius: 12px;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
.send-btn:hover { background: var(--accent-blue-hover); transform: translateY(-2px); }

/* Settings Modal */
.modal {
    display: none; 
    position: fixed; 
    z-index: 1000; 
    left: 0; top: 0; 
    width: 100%; height: 100%; 
    background-color: rgba(0,0,0,0.6);
    backdrop-filter: blur(5px);
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: var(--bg-color);
    padding: 30px;
    border-radius: 20px;
    width: 400px;
    max-width: 90%;
    position: relative;
    border: 1px solid var(--panel-border);
}

.close-btn {
    position: absolute;
    top: 15px; right: 20px;
    color: var(--text-secondary);
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.settings-group {
    margin-top: 15px;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.settings-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.settings-group input, .settings-group select {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--panel-border);
    padding: 10px;
    border-radius: 8px;
    color: white;
    outline: none;
    font-family: inherit;
}
.settings-group select option { background: var(--bg-color); }

/* Mobile Optimization */
@media (max-width: 900px) {
    .app-container {
        flex-direction: column;
        height: 100vh;
        width: 100%;
        border-radius: 0;
        gap: 0;
    }
    
    .sidebar {
        width: 100%;
        height: 250px;
        flex-direction: row;
        overflow-x: auto;
        gap: 20px;
        padding: 16px;
        border-radius: 0;
        border-bottom: 1px solid var(--panel-border);
    }
    
    .profile-header { display: flex; flex-direction: column; justify-content: center; min-width: 140px; margin: 0; }
    .data-section { min-width: 180px; margin: 0; }
    
    .glass-panel { border-radius: 0; border: none; }
    
    .chat-messages { padding: 16px; }
    .message { max-width: 95%; }
    
    .chat-input-container { padding: 12px; }
    .upload-btn { padding: 10px; font-size: 1.2rem; }
    #chat-input { padding: 12px 16px; font-size: 0.9rem; }
    .send-btn { padding: 12px 16px; }
}