:root {
    /* Premium Dark Theme (Default) */
    --bg-main: #0b0c10;
    --bg-sidebar: #12131a;
    --bg-input: #1a1c23;
    --bg-user-msg: #1f212a;
    --bg-hover: rgba(255, 255, 255, 0.06);
    --bg-active: rgba(255, 255, 255, 0.1);
    
    --text-primary: #e2e4e9;
    --text-secondary: #9499a6;
    --text-placeholder: #6a6f7d;
    
    --border-light: rgba(255, 255, 255, 0.06);
    --border-medium: rgba(255, 255, 255, 0.12);
    
    --accent-color: #8b5cf6;
    --accent-hover: #7c3aed;
    --accent-glow: rgba(139, 92, 246, 0.25);
    
    --accent-btn: #8b5cf6;
    --accent-btn-text: #ffffff;
    --accent-btn-disabled: #2d2f3a;
    --accent-btn-disabled-text: #6a6f7d;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
    
    --logo-bg: linear-gradient(135deg, #1e2029, #2d303e);
}

.light-theme {
    /* Premium High-Contrast Light Theme */
    --bg-main: #ffffff;
    --bg-sidebar: #f9fafb;
    --bg-input: #ffffff;
    --bg-user-msg: #f3f4f6;
    --bg-hover: #f3f4f6;
    --bg-active: #e5e7eb;
    
    --text-primary: #030712;
    --text-secondary: #4b5563;
    --text-placeholder: #9ca3af;
    
    --border-light: #f3f4f6;
    --border-medium: #e5e7eb;
    
    --accent-color: #6d28d9;
    --accent-hover: #5b21b6;
    --accent-glow: rgba(109, 40, 217, 0.15);
    
    --accent-btn: #6d28d9;
    --accent-btn-text: #ffffff;
    --accent-btn-disabled: #f3f4f6;
    --accent-btn-disabled-text: #9ca3af;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
    
    --logo-bg: #ffffff;
}

:root {
    /* Semantic Colors */
    --sev-critical: #ef4444;
    --sev-high: #f97316;
    --sev-medium: #eab308;
    --sev-low: #10b981;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body, html {
    height: 100%;
    width: 100%;
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 15px;
    line-height: 1.6;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Global Custom Scrollbars */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background-color: var(--border-medium);
    border-radius: 3px;
    transition: background-color 0.2s;
}
::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-secondary);
}
::-webkit-scrollbar-corner {
    background: transparent;
}

#app-container {
    display: flex;
    height: 100%;
    height: 100dvh; /* Modern mobile viewport fix */
    width: 100%;
}

/* --- Sidebar --- */
#sidebar {
    width: 280px;
    margin-left: 0;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
    z-index: 20;
}

#app-container.sidebar-closed #sidebar {
    margin-left: -280px;
    opacity: 0;
    pointer-events: none;
}

#app-container.sidebar-closed-init #sidebar {
    margin-left: -280px;
    opacity: 0;
    pointer-events: none;
    transition: none; /* Instant on load */
}

.sidebar-header {
    padding: 20px 16px 12px;
}

.new-chat-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-main);
    border: 1px solid var(--border-medium);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.new-chat-btn:hover {
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px var(--accent-glow);
    transform: translateY(-1px);
}

.new-chat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
}

.sidebar-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 8px 16px;
}

.sidebar-scroll {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 8px 16px;
}

.history-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
    padding: 8px 4px;
    margin-top: 12px;
    margin-bottom: 4px;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    margin-bottom: 2px;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.history-item-text {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    pointer-events: none;
}

.history-edit-input {
    flex: 1;
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--accent-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    padding: 2px 6px;
    outline: none;
    width: 100%;
    min-width: 0;
}

.history-item-actions {
    position: relative;
    opacity: 0;
    transition: opacity 0.2s;
    display: flex;
    align-items: center;
}

.history-item:hover .history-item-actions,
.history-item-menu.open ~ .history-item-actions,
.history-item.active .history-item-actions {
    opacity: 1;
}

.history-item-btn-dots {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s, color 0.2s;
}

.history-item-btn-dots:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.history-item-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 4px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-medium);
    border-radius: 8px;
    padding: 4px;
    box-shadow: var(--shadow-md);
    display: none;
    flex-direction: column;
    z-index: 200;
    min-width: 120px;
}

.history-item-menu.open {
    display: flex;
    animation: fade-in 0.1s ease-out;
}

.history-menu-item {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 8px 12px;
    background: transparent;
    border: none;
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 12px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    text-align: left;
    transition: background-color 0.2s;
}

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

.history-menu-item.delete-btn {
    color: var(--sev-critical);
}

.history-menu-item.delete-btn:hover {
    background-color: rgba(239, 68, 68, 0.1);
}

.history-item:hover {
    background-color: var(--bg-hover);
}

.history-item.active {
    background-color: var(--bg-active);
    color: var(--accent-color);
    font-weight: 600;
}

.sidebar-footer {
    padding: 12px 16px 20px;
    display: flex;
    flex-direction: column;
}

.profile-dropdown-container {
    position: relative;
    width: 100%;
}

.dropdown-menu {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 0;
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--border-medium);
    border-radius: 12px;
    padding: 8px;
    box-shadow: var(--shadow-md);
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 100;
}

.dropdown-menu.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 10px 12px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: background-color 0.2s;
}

.dropdown-item:hover {
    background-color: var(--bg-hover);
}

.theme-icon-container {
    position: relative;
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.theme-icon {
    position: absolute;
    top: 0;
    left: 0;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Default Dark Theme Active -> Button says "Switch to Light Mode" (Sun icon) */
.icon-for-dark {
    opacity: 0;
    transform: rotate(90deg) scale(0.5);
}
.icon-for-light {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

/* Light Theme Active -> Button says "Switch to Dark Mode" (Moon icon) */
.light-theme .icon-for-dark {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}
.light-theme .icon-for-light {
    opacity: 0;
    transform: rotate(-90deg) scale(0.5);
}

.dropdown-divider {
    height: 1px;
    background-color: var(--border-medium);
    margin: 4px 0;
}

.sidebar-action-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 10px 12px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: background-color 0.2s;
}

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

.avatar-placeholder {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    background: linear-gradient(135deg, #4f46e5, #8b5cf6);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: var(--shadow-sm);
}

/* --- Main Content --- */
#main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    position: relative;
}

#topbar {
    height: 60px;
    display: flex;
    align-items: center;
    padding: 0 24px;
    background: linear-gradient(180deg, var(--bg-main) 0%, transparent 100%);
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s, color 0.2s;
    margin-right: 12px;
}

.icon-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.model-selector {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.model-version {
    font-size: 11px;
    font-weight: 600;
    background-color: var(--bg-hover);
    padding: 2px 8px;
    border-radius: 6px;
    color: var(--accent-color);
}

/* --- Chat Container --- */
#chat-container {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    padding-top: 60px;
    scroll-behavior: smooth;
}

#messages-area {
    display: flex;
    flex-direction: column;
    padding-bottom: 40px;
}

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 65vh;
    text-align: center;
    animation: fade-in 0.6s ease-out;
}

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

.welcome-logo {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: var(--logo-bg);
    border: 1px solid var(--border-medium);
    color: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    box-shadow: var(--shadow-md);
}

.welcome-screen h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

/* Chat Messages */
.message-row {
    padding: 24px;
    display: flex;
    justify-content: center;
    animation: slide-up 0.4s ease-out;
}

@keyframes slide-up {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

.message-inner {
    width: 100%;
    max-width: 800px;
    display: flex;
    gap: 20px;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.message-avatar.user {
    background: linear-gradient(135deg, #4f46e5, #8b5cf6);
    color: white;
    font-weight: 600;
    font-size: 14px;
}

.message-avatar.ai {
    background: var(--bg-input);
    border: 1px solid var(--border-medium);
    color: var(--accent-color);
}

.message-content {
    flex: 1;
    min-width: 0;
    font-size: 15px;
    line-height: 1.7;
}

/* User Message styling */
.user-message-bubble {
    background-color: var(--bg-user-msg);
    border: 1px solid var(--border-light);
    padding: 16px 20px;
    border-radius: 16px;
    border-top-right-radius: 4px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 13px;
    max-height: 300px;
    max-width: 100%;
    overflow-y: auto;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
    width: fit-content;
    margin-left: auto;
    box-shadow: var(--shadow-sm);
}

.message-row.user-row .message-inner {
    justify-content: flex-end;
}

/* AI Message styling */
.ai-message-content {
    color: var(--text-primary);
}

.ai-message-content h3 {
    font-size: 18px;
    margin-bottom: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.ai-message-content p {
    margin-bottom: 16px;
}

.ai-message-content ol {
    padding-left: 20px;
    margin-bottom: 20px;
}

.ai-message-content li {
    margin-bottom: 10px;
    padding-left: 8px;
}

.ai-message-content li::marker {
    color: var(--accent-color);
    font-weight: 600;
}

.ai-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s, text-decoration 0.2s;
}

.ai-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.ai-code {
    background-color: var(--bg-hover);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--accent-color);
}

.severity-pill {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 16px;
    margin-right: 10px;
    box-shadow: var(--shadow-sm);
}

.severity-pill::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: currentColor;
    margin-right: 6px;
}

.severity-pill.critical { background-color: rgba(239, 68, 68, 0.15); color: var(--sev-critical); border: 1px solid rgba(239, 68, 68, 0.3); }
.severity-pill.high { background-color: rgba(249, 115, 22, 0.15); color: var(--sev-high); border: 1px solid rgba(249, 115, 22, 0.3); }
.severity-pill.medium { background-color: rgba(234, 179, 8, 0.15); color: var(--sev-medium); border: 1px solid rgba(234, 179, 8, 0.3); }
.severity-pill.low { background-color: rgba(16, 185, 129, 0.15); color: var(--sev-low); border: 1px solid rgba(16, 185, 129, 0.3); }

.mod-pill {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    background-color: var(--bg-hover);
    border: 1px solid var(--border-medium);
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

/* --- Premium AI Elements --- */
.ai-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 13px;
    border: 1px solid var(--border-medium);
    border-radius: 8px;
    overflow: hidden;
}

.ai-table th {
    background-color: var(--bg-hover);
    padding: 10px 12px;
    text-align: left;
    font-weight: 600;
    border-bottom: 1px solid var(--border-medium);
}

.ai-table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-light);
}

.ai-table tr:last-child td {
    border-bottom: none;
}

.ai-code-block {
    background-color: #0d1117;
    border: 1px solid var(--border-medium);
    border-radius: 12px;
    padding: 16px;
    margin: 16px 0;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.5;
    overflow-x: auto;
    position: relative;
}

.ai-code-block::before {
    content: attr(data-lang);
    position: absolute;
    top: 0;
    right: 16px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-secondary);
    padding: 4px 8px;
    background: var(--bg-hover);
    border-bottom-left-radius: 8px;
    border-bottom-right-radius: 8px;
}

.ai-message-content p {
    margin-bottom: 12px;
}

.ai-message-content hr {
    border: none;
    height: 1px;
    background: var(--border-medium);
    margin: 24px 0;
}


/* --- Input Area --- */
#input-container {
    padding: 0 24px 24px;
    background: linear-gradient(0deg, var(--bg-main) 60%, transparent 100%);
}

.input-wrapper {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.queue-bar {
    display: none;
    align-items: center;
    gap: 8px;
    padding: 8px 0;
    font-size: 12px;
    font-weight: 500;
    color: var(--accent-color);
    justify-content: center;
    animation: fade-in 0.3s;
}

.queue-bar.visible {
    display: flex;
}

.input-box {
    background-color: var(--bg-input);
    border: 1px solid var(--border-medium);
    border-radius: 20px;
    padding: 12px 16px;
    padding-right: 56px;
    display: flex;
    align-items: flex-end;
    position: relative;
    box-shadow: var(--shadow-md);
    transition: border-color 0.3s, box-shadow 0.3s, background-color 0.3s;
}

.input-box:focus-within {
    border-color: var(--accent-color);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

#crash-log-input {
    width: 100%;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 24px;
    max-height: 240px;
    resize: none;
    padding: 6px 0;
}

#crash-log-input::placeholder {
    color: var(--text-placeholder);
    font-family: var(--font-primary);
}

#crash-log-input::placeholder {
    color: var(--text-placeholder);
    font-family: var(--font-primary);
}

.send-btn {
    position: absolute;
    right: 12px;
    bottom: 12px;
    width: 36px;
    height: 36px;
    border-radius: 12px;
    background-color: var(--accent-btn);
    color: var(--accent-btn-text);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 10px var(--accent-glow);
}

.send-btn:hover:not(:disabled) {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px var(--accent-glow);
}

.send-btn:disabled {
    background-color: var(--accent-btn-disabled);
    color: var(--accent-btn-disabled-text);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.disclaimer {
    text-align: center;
    font-size: 11px;
    color: var(--text-placeholder);
    margin-top: 12px;
}

/* --- Toast --- */
.toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    background-color: var(--bg-input);
    border: 1px solid rgba(239, 68, 68, 0.3);
    box-shadow: 0 8px 30px rgba(239, 68, 68, 0.2);
    color: var(--sev-critical);
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 13px;
    font-weight: 500;
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
}

.toast.visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Three.js Loading Canvas Container */
.loading-canvas-container {
    display: flex;
    align-items: center;
    gap: 16px;
}

.loading-text-glow {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    background: linear-gradient(90deg, var(--text-secondary) 0%, var(--text-primary) 50%, var(--text-secondary) 100%);
    background-size: 200% auto;
    color: transparent;
    -webkit-background-clip: text;
    background-clip: text;
    animation: shine 2s linear infinite;
}

@keyframes shine {
    to { background-position: 200% center; }
}

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
    #sidebar {
        position: absolute;
        height: 100%;
        left: 0;
        top: 0;
        box-shadow: 20px 0 50px rgba(0, 0, 0, 0.5);
    }
    
    #app-container.sidebar-closed #sidebar,
    #app-container.sidebar-closed-init #sidebar {
        margin-left: -280px;
    }

    /* Force the Topbar (and its buttons) to the front layer */
    #topbar {
        z-index: 50;
        background: var(--bg-main);
        border-bottom: 1px solid var(--border-light);
    }

    #btn-toggle-sidebar {
        background: var(--bg-hover);
    }



    /* Message padding on mobile */
    .message-row {
        padding: 16px 12px;
    }

    .message-inner {
        gap: 12px;
    }

    .message-avatar {
        width: 32px;
        height: 32px;
    }

    .welcome-screen h1 {
        font-size: 22px;
        padding: 0 20px;
    }

    /* Input area on mobile */
    #input-container {
        padding: 0 12px 12px;
    }

    .input-box {
        padding: 10px 14px;
        padding-right: 50px;
        border-radius: 16px;
    }

    .send-btn {
        right: 8px;
        bottom: 8px;
        width: 32px;
        height: 32px;
    }
    
    .dropdown-menu {
        max-height: 40vh;
        overflow-y: auto;
    }

    /* Ensure disclaimer is visible and centered */
    .disclaimer {
        display: block !important;
        visibility: visible !important;
        margin-top: 10px;
        font-size: 10px;
        color: var(--text-secondary);
        text-align: center;
        width: 100%;
    }
}