/* CSS Variables */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --success: #10b981;
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-secondary: linear-gradient(135deg, #ec4899 0%, #8b5cf6 100%);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1200;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.modal.open {
    opacity: 1;
    pointer-events: auto;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(4px);
}

.alert-dialog {
    position: relative;
    width: min(420px, 90vw);
    padding: 2rem;
    background: var(--bg-primary);
    border-radius: 1.5rem;
    box-shadow: 0 25px 60px -12px rgba(15, 23, 42, 0.35);
    border: 1px solid rgba(99, 102, 241, 0.12);
    display: grid;
    gap: 1.5rem;
    animation: modalPop var(--transition-bounce);
}

.alert-icon {
    width: 3.25rem;
    height: 3.25rem;
    border-radius: 1rem;
    background: linear-gradient(140deg, rgba(99, 102, 241, 0.14), rgba(139, 92, 246, 0.14));
    display: grid;
    place-items: center;
    color: var(--primary);
}

.alert-icon svg {
    color: inherit;
}

.alert-body h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.35rem;
    font-family: 'Space Grotesk', sans-serif;
}

.alert-body p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.alert-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
    flex-wrap: wrap;
}

.alert-btn {
    min-width: 120px;
    padding: 0.75rem 1.25rem;
    border-radius: 0.85rem;
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.alert-btn.primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 12px 25px -12px rgba(99, 102, 241, 0.75);
}

.alert-btn.ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.alert-btn:hover,
.alert-btn:focus-visible {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.alert-btn.ghost:hover,
.alert-btn.ghost:focus-visible {
    border-color: var(--primary);
    color: var(--primary);
}

@keyframes modalPop {
    0% {
        transform: translateY(12px) scale(0.96);
        opacity: 0;
    }
    100% {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.chat-footer {
    margin: 2rem auto 1.5rem;
    width: fit-content;
    padding: 0.75rem 1.5rem;
    border-radius: 999px;
    background: rgba(99, 102, 241, 0.08);
    color: var(--text-secondary);
    font-size: 0.85rem;
    display: inline-flex;
    gap: 0.5rem;
    align-items: center;
    box-shadow: 0 12px 30px -18px rgba(99, 102, 241, 0.45);
    backdrop-filter: blur(6px);
}

[data-theme="dark"] .chat-footer {
    background: rgba(99, 102, 241, 0.12);
    color: var(--text-tertiary);
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background var(--transition-base), color var(--transition-base);
}

[data-protected] {
    position: relative;
    user-select: none;
    -webkit-user-select: none;
}

[data-protected] input,
[data-protected] textarea,
[data-protected] select,
[data-protected] button,
[data-protected] [contenteditable="true"],
[data-protected] [data-allow-copy] {
    user-select: text;
    -webkit-user-select: text;
}

.anti-theft-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.82);
    backdrop-filter: blur(6px);
    z-index: 2500;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.anti-theft-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

.anti-theft-overlay[hidden] {
    display: none;
}

.anti-theft-message {
    max-width: 30rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 2.75rem 2.25rem;
    text-align: center;
    color: var(--text-primary);
    box-shadow: var(--shadow-xxl);
    display: grid;
    gap: 1.5rem;
}

.anti-theft-message svg {
    margin: 0 auto;
    color: var(--accent-primary);
}

.anti-theft-message h2 {
    font-size: 1.6rem;
    font-weight: 700;
}

.anti-theft-message p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 1000;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 2rem;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.theme-toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-xl);
}

.toggle-track {
    width: 4rem;
    height: 2rem;
    border-radius: 2rem;
    position: relative;
    background: var(--gradient-primary);
}

.toggle-thumb {
    position: absolute;
    top: 0.25rem;
    left: 0.25rem;
    width: 1.5rem;
    height: 1.5rem;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-bounce);
    box-shadow: var(--shadow-md);
}

[data-theme="dark"] .toggle-thumb {
    transform: translateX(2rem);
}

.sun-icon {
    color: #f59e0b;
    transition: opacity var(--transition-base);
}

.moon-icon {
    color: #6366f1;
    position: absolute;
    opacity: 0;
    transition: opacity var(--transition-base);
}

[data-theme="dark"] .sun-icon {
    opacity: 0;
}

[data-theme="dark"] .moon-icon {
    opacity: 1;
}

/* Back Button */
.back-button {
    position: fixed;
    top: 4rem;
    left: 23rem;
    z-index: 1001;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.25rem;
    border-radius: 0.75rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.back-button:hover {
    background: var(--bg-tertiary);
    transform: translateX(-3px);
    box-shadow: var(--shadow-lg);
}

/* Main Container */
.chat-page-container {
    display: flex;
    min-height: 100vh;
    background: var(--bg-primary);
    overflow-x: hidden;
}

/* Sidebar */
.chat-sidebar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: all var(--transition-base);
}

.chat-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(2px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    z-index: 900;
}

.chat-overlay.active {
    opacity: 1;
    visibility: visible;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-info h2 {
    font-size: 1.125rem;
    font-weight: 700;
    font-family: 'Space Grotesk', sans-serif;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-info p {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.sidebar-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.new-chat-btn {
    margin: 1rem;
    padding: 0.875rem;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.new-chat-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.chat-history {
    flex: 1;
    overflow-y: auto;
    padding: 0 1rem;
}

.chat-history h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.history-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--text-secondary);
}

.history-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
    min-width: 0;
}

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

.history-item.active {
    background: var(--bg-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.history-item span {
    font-size: 0.875rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-delete {
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    padding: 0.25rem;
    border-radius: 0.375rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: color var(--transition-base), background var(--transition-base), transform var(--transition-base);
}

.history-delete:hover,
.history-delete:focus-visible {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.12);
    transform: scale(1.05);
}

.history-delete svg {
    pointer-events: none;
}

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 2.5rem;
    height: 2.5rem;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.user-name {
    font-weight: 600;
    font-size: 0.875rem;
}

.user-status {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

/* Main Chat Area */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-primary);
}

.sidebar-toggle,
.sidebar-close {
    display: none;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background var(--transition-base), color var(--transition-base);
}

.sidebar-toggle:hover,
.sidebar-close:hover,
.sidebar-toggle:focus-visible,
.sidebar-close:focus-visible {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.chat-info h1 {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: 'Space Grotesk', sans-serif;
    margin-bottom: 0.25rem;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.status-dot {
    width: 0.5rem;
    height: 0.5rem;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.8; }
}

.chat-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    width: 2.5rem;
    height: 2.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--text-secondary);
}

.action-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateY(-2px);
}

/* Welcome Screen */
.welcome-screen {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    animation: fadeIn 0.5s ease-out;
}

.welcome-screen.hidden {
    display: none;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.welcome-content {
    max-width: 800px;
    text-align: center;
}

.welcome-icon {
    margin-bottom: 1.5rem;
    animation: float 3s ease-in-out infinite;
}

.welcome-icon svg {
    stroke: url(#gradient1);
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.welcome-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    font-family: 'Space Grotesk', sans-serif;
}

.welcome-content > p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.prompt-suggestions h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.suggestions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.suggestion-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 1rem;
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: left;
}

.suggestion-card:hover {
    background: var(--bg-tertiary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.suggestion-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.suggestion-card h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-family: 'Space Grotesk', sans-serif;
}

.suggestion-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Messages Container */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 2rem 2.5rem;
    display: none;
    flex-direction: column;
    gap: 1.5rem;
}

.messages-container.active {
    display: flex;
}

.messages-container::-webkit-scrollbar {
    width: 8px;
}

.messages-container::-webkit-scrollbar-track {
    background: transparent;
}

.messages-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

/* Message Styles */
.message {
    display: flex;
    gap: 1rem;
    animation: messageSlideIn 0.4s ease-out;
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-avatar {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.message.assistant .message-avatar {
    background: var(--gradient-primary);
    color: white;
}

.message-content {
    flex: 1;
    max-width: 70%;
}

.message-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.message-name {
    font-weight: 600;
    font-size: 0.875rem;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.message-text {
    background: var(--bg-secondary);
    padding: 1rem 1.25rem;
    border-radius: 1rem;
    line-height: 1.7;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message.user .message-content {
    margin-left: auto;
}

.message.user .message-text {
    background: var(--gradient-primary);
    color: white;
}

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

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.typing-dots {
    background: var(--bg-secondary);
    padding: 1rem 1.25rem;
    border-radius: 1rem;
    display: flex;
    gap: 0.25rem;
}

.typing-dot {
    width: 0.5rem;
    height: 0.5rem;
    background: var(--text-tertiary);
    border-radius: 50%;
    animation: typingBounce 1.4s ease-in-out infinite;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingBounce {
    0%, 60%, 100% {
        transform: translateY(0);
    }
    30% {
        transform: translateY(-8px);
    }
}

/* Input Area */
.input-area {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 0.75rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 1.25rem;
    padding: 0.75rem 1rem;
    transition: all var(--transition-base);
}

.input-wrapper:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.attach-btn {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    border-radius: 0.5rem;
}

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

.chat-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    resize: none;
    font-family: inherit;
    font-size: 0.9375rem;
    color: var(--text-primary);
    line-height: 1.5;
    max-height: 150px;
    overflow-y: auto;
}

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

.send-btn {
    background: var(--gradient-primary);
    border: none;
    color: white;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.send-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.send-btn:active {
    transform: scale(0.95);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.input-footer {
    margin-top: 0.75rem;
    text-align: center;
}

.input-footer p {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.input-footer kbd {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    font-family: 'Space Grotesk', monospace;
    font-size: 0.75rem;
}

@media (max-width: 1024px) {
    .chat-page-container {
        flex-direction: column;
    }

    .chat-sidebar {
        position: fixed;
        top: 0;
        left: -320px;
        height: 100vh;
        z-index: 1000;
        width: min(320px, 90vw);
        box-shadow: var(--shadow-xl);
    }

    .chat-sidebar.open {
        left: 0;
    }

    .chat-main {
        flex: 1;
        min-height: 100vh;
    }

    .sidebar-toggle {
        display: inline-flex;
    }

    .sidebar-close {
        display: inline-flex;
        margin-left: auto;
    }
}

@media (max-width: 900px) {
    .chat-header {
        padding: 1.25rem 1.5rem;
    }

    .messages-container {
        padding: 1.5rem;
    }

    .input-area {
        padding: 1.25rem 1.5rem;
    }

    .suggestions-grid {
        grid-template-columns: 1fr;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .chat-sidebar {
        width: min(300px, 85vw);
    }

    .chat-header {
        gap: 1rem;
    }

    .chat-info h1 {
        font-size: 1.25rem;
    }

    .messages-container {
        padding: 1.25rem 1.5rem;
        gap: 1.25rem;
    }

    .message-content {
        max-width: 90%;
    }

    .back-button {
        padding: 0.5rem;
    }
    
    .back-button span {
        display: none;
    }

    .input-area {
        padding: 1rem 1.25rem 1.25rem;
    }

    .input-wrapper {
        padding: 0.65rem 0.85rem;
    }
}

@media (max-width: 520px) {
    .chat-header {
        padding: 1rem;
    }

    .messages-container {
        padding: 1rem;
    }

    .input-area {
        padding: 0.9rem 1rem 1.1rem;
    }

    .message-text {
        font-size: 0.875rem;
        padding: 0.85rem 1rem;
    }

    .chat-input {
        font-size: 0.875rem;
    }
}