/* --- Root Constants & Variables --- */
:root {
    --bg-app: linear-gradient(180deg, #101116 0%, #1b1c24 100%);
    --bg-sidebar: rgba(15, 18, 29, 0.45);
    --bg-card: rgba(22, 28, 45, 0.4);
    --bg-input: rgba(15, 18, 30, 0.75);
    --border-color: rgba(255, 255, 255, 0.06);
    --border-glow: rgba(139, 92, 246, 0.2);
    
    --color-primary: #8b5cf6; /* Neon Purple */
    --color-primary-glow: rgba(139, 92, 246, 0.4);
    --color-secondary: #3b82f6; /* Electric Blue */
    --color-success: #10b981; /* Emerald Green */
    --color-warning: #f59e0b; /* Amber */
    --color-error: #ef4444; /* Coral Red */
    
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --text-dark: #64748b;
    
    --font-sans: 'Plus Jakarta Sans', -apple-system, sans-serif;
    --font-display: 'Outfit', sans-serif;
    --font-mono: 'Fira Code', monospace;
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --sidebar-width: 320px;
}

/* --- Base Resets & Typography --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: var(--bg-app);
    color: var(--text-main);
    font-family: var(--font-sans);
    height: 100vh;
    overflow: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    position: relative;
}

/* --- Background Canvas & Gray Sun --- */
#sky-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 1;
}

.gray-sun {
    position: absolute;
    top: 15%;
    right: 25%;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(200, 205, 215, 0.15) 0%, rgba(148, 163, 184, 0.03) 45%, rgba(0, 0, 0, 0) 70%);
    box-shadow: 0 0 100px rgba(148, 163, 184, 0.05);
    pointer-events: none;
    z-index: 1;
    animation: float-sun 16s ease-in-out infinite alternate;
}

@keyframes float-sun {
    0% { transform: translateY(0px) scale(0.98); opacity: 0.9; }
    100% { transform: translateY(15px) scale(1.02); opacity: 1; }
}

/* --- Layout Structure --- */
.app-container {
    display: flex;
    width: 100vw;
    height: 100vh;
}

/* --- Sidebar Styling --- */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    backdrop-filter: blur(16px);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 10;
}

.sidebar-header {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 20px;
    letter-spacing: -0.5px;
}

.icon-gradient {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 24px;
}

.badge {
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 6px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    vertical-align: middle;
    margin-left: 4px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.new-chat-btn {
    width: 100%;
    padding: 12px;
    border-radius: 12px;
    border: 1px solid var(--border-glow);
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(59, 130, 246, 0.1));
    color: var(--text-main);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition-smooth);
}

.new-chat-btn:hover {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.25), rgba(59, 130, 246, 0.25));
    border-color: var(--color-primary);
    box-shadow: 0 0 12px var(--color-primary-glow);
    transform: translateY(-1px);
}

/* Status Panel */
.status-panel {
    margin: 16px 20px;
    padding: 16px;
    border-radius: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
}

.status-title {
    font-size: 10px;
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.status-indicator-container {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.pulse-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--color-warning);
    box-shadow: 0 0 8px var(--color-warning);
}

.pulse-indicator.ready {
    background-color: var(--color-success);
    box-shadow: 0 0 8px var(--color-success);
    animation: pulse 2s infinite;
}

.pulse-indicator.loading {
    background-color: var(--color-warning);
    box-shadow: 0 0 8px var(--color-warning);
    animation: flash 1s infinite alternate;
}

.pulse-indicator.error {
    background-color: var(--color-error);
    box-shadow: 0 0 8px var(--color-error);
}

.status-text {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-main);
}

.hardware-info {
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Progress bar */
.progress-bar-container {
    width: 100%;
    height: 4px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 2px;
    margin-top: 12px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    width: 45%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 2px;
    animation: progress-loop 2s infinite ease-in-out;
}

@keyframes progress-loop {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(250%); }
}

/* Sidebar Navigation Settings */
.sidebar-menu {
    flex-grow: 1;
    overflow-y: auto;
    padding: 0 20px;
}

.menu-section {
    margin-bottom: 28px;
}

.menu-label {
    display: block;
    font-size: 11px;
    font-family: var(--font-display);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.setting-item {
    margin-bottom: 16px;
}

.setting-item label {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.setting-item input[type="range"] {
    width: 100%;
    accent-color: var(--color-primary);
    cursor: pointer;
    background: rgba(255,255,255,0.05);
    border-radius: 4px;
    height: 6px;
}

.setting-item textarea {
    width: 100%;
    height: 80px;
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: rgba(0,0,0,0.25);
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 12px;
    resize: none;
    outline: none;
    transition: var(--transition-fast);
}

.setting-item textarea:focus {
    border-color: var(--color-primary-glow);
    box-shadow: 0 0 6px var(--border-glow);
}

.lang-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.lang-tag {
    font-size: 11px;
    padding: 6px 10px;
    border-radius: 8px;
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition-fast);
}

.lang-tag i {
    font-size: 12px;
}

.lang-tag:hover {
    background-color: rgba(255, 255, 255, 0.06);
    color: var(--text-main);
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: white;
}

.user-details {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-main);
}

.user-role {
    font-size: 11px;
    color: var(--text-muted);
}

/* --- Main Chat Section --- */
.chat-area {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    background-color: transparent;
    position: relative;
    z-index: 5;
}

.chat-header {
    height: 70px;
    border-bottom: 1px solid var(--border-color);
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
    background-color: rgba(9, 11, 17, 0.5);
    backdrop-filter: blur(10px);
}

.chat-header h2 {
    font-family: var(--font-display);
    font-size: 16px;
    font-weight: 600;
}

.chat-header p {
    font-size: 11px;
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    gap: 12px;
}

.icon-btn {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background-color: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.icon-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--color-error);
    border-color: rgba(239, 68, 68, 0.2);
}

/* Messages List */
.messages-container {
    flex-grow: 1;
    overflow-y: auto;
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Welcome Screen styling */
.welcome-screen {
    max-width: 720px;
    margin: 40px auto;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: fade-up 0.8s ease;
}

.welcome-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(59, 130, 246, 0.1));
    border: 1px solid var(--border-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--color-primary);
    margin-bottom: 24px;
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.1);
}

.welcome-screen h1 {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 32px;
    margin-bottom: 12px;
    background: linear-gradient(90deg, #fff, var(--text-muted));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.welcome-screen p {
    font-size: 15px;
    color: var(--text-muted);
    max-width: 580px;
    margin-bottom: 40px;
    line-height: 1.6;
}

.quick-prompts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    width: 100%;
}

.prompt-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 18px;
    border-radius: 14px;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.prompt-card i {
    font-size: 18px;
    margin-bottom: 4px;
}

.text-blue { color: var(--color-secondary); }
.text-purple { color: var(--color-primary); }
.text-orange { color: #f97316; }
.text-green { color: var(--color-success); }

.prompt-card h3 {
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 600;
}

.prompt-card p {
    font-size: 12px;
    color: var(--text-dark);
    margin: 0;
}

.prompt-card:hover {
    border-color: var(--color-primary-glow);
    background-color: rgba(22, 28, 45, 0.8);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* Chat bubble aesthetics */
.message {
    display: flex;
    gap: 16px;
    max-width: 85%;
    animation: fade-in 0.4s ease;
}

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message.assistant {
    align-self: flex-start;
}

.message-avatar {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: white;
    flex-shrink: 0;
    margin-top: 4px;
}

.message.user .message-avatar {
    background-color: var(--color-secondary);
}

.message.assistant .message-avatar {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}

.message-content {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 14px 20px;
    border-radius: 16px;
    font-size: 14px;
    color: var(--text-main);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.message.user .message-content {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(59, 130, 246, 0.03));
    border-color: rgba(59, 130, 246, 0.15);
    border-top-right-radius: 4px;
}

.message.assistant .message-content {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.04), rgba(22, 28, 45, 0.6));
    border-top-left-radius: 4px;
}

/* Chat Input Bar Footer */
.chat-footer {
    padding: 16px 32px 24px;
    background-color: transparent;
    flex-shrink: 0;
}

.input-form {
    max-width: 800px;
    margin: 0 auto;
}

.input-wrapper {
    position: relative;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    transition: var(--transition-smooth);
}

.input-wrapper:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 14px var(--color-primary-glow);
}

.input-wrapper textarea {
    flex-grow: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 14px;
    padding: 8px 0;
    resize: none;
    max-height: 200px;
    line-height: 1.5;
}

.input-wrapper textarea::placeholder {
    color: var(--text-dark);
}

.input-actions {
    display: flex;
    align-items: center;
    align-self: flex-end;
    margin-bottom: 4px;
}

.input-actions button {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: var(--transition-smooth);
}

.input-actions button:disabled {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    color: var(--text-dark);
    cursor: not-allowed;
}

.input-actions button:hover:not(:disabled) {
    box-shadow: 0 0 10px var(--color-primary-glow);
    transform: scale(1.03);
}

.input-hint {
    font-size: 10px;
    color: var(--text-dark);
    text-align: center;
    margin-top: 8px;
    font-weight: 500;
}

.input-hint kbd {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-sans);
    font-size: 9px;
}

/* --- Code & Markdown Formatting --- */
.message-content p {
    margin-bottom: 12px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content ul, .message-content ol {
    margin-bottom: 12px;
    padding-left: 20px;
}

.message-content li {
    margin-bottom: 4px;
}

.message-content code:not(pre code) {
    background-color: rgba(255, 255, 255, 0.08);
    color: #e5c07b;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 12px;
}

/* Code container styling */
.code-container {
    margin: 16px 0;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    background-color: #1e1e24;
}

.code-header {
    background-color: rgba(0, 0, 0, 0.2);
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-family: var(--font-display);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
}

.code-header .lang-label {
    text-transform: uppercase;
    font-size: 10px;
    letter-spacing: 0.5px;
    color: var(--color-primary);
}

.copy-code-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    font-weight: 500;
    transition: var(--transition-fast);
}

.copy-code-btn:hover {
    color: var(--text-main);
}

.code-container pre {
    margin: 0 !important;
    padding: 16px !important;
    background: transparent !important;
    font-family: var(--font-mono) !important;
    font-size: 13px !important;
    overflow-x: auto;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.06);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.12);
}

/* Animations */
@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
    70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

@keyframes flash {
    0% { opacity: 0.5; }
    100% { opacity: 1; }
}

@keyframes fade-in {
    from { opacity: 0; transform: scale(0.98); }
    to { opacity: 1; transform: scale(1); }
}

@keyframes fade-up {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive adjustments */
@media(max-width: 900px) {
    .app-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    .sidebar-menu {
        display: none; /* Collapsed in mobile for cleanliness */
    }
    .quick-prompts-grid {
        grid-template-columns: 1fr;
    }
    .chat-header {
        padding: 0 20px;
    }
    .messages-container {
        padding: 20px;
    }
    .message {
        max-width: 95%;
    }
}