/* ===== TWE AI Chat - CSS ===== */
:root {
    --bg-primary: #0D0D0D;
    --bg-secondary: #151515;
    --bg-tertiary: #1A1A1A;
    --bg-surface: #2D2D2D;
    --border: #333333;
    --accent: #00E89D;
    --accent-hover: #00CC88;
    --text-primary: #FFFFFF;
    --text-secondary: #B0B0B0;
    --text-on-accent: #0D0D0D;
    --font-body: 'Inter', 'Poppins', sans-serif;
    --font-heading: 'Montserrat', 'Poppins', sans-serif;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-xs: 6px;
    --transition: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

html, body {
    height: 100%;
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
}

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

/* ===== Sidebar ===== */
.sidebar {
    width: 280px;
    min-width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition), opacity var(--transition);
    z-index: 100;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    transform: translateX(-100%);
}

.sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.5);
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-logo {
    height: 32px;
    width: auto;
}

.btn-new-chat {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    margin: 16px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-new-chat:hover {
    border-color: var(--accent);
    background: rgba(0, 232, 157, 0.05);
}

.btn-new-chat svg {
    width: 18px;
    height: 18px;
    stroke: var(--accent);
}

.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 8px;
}

.conversations-list::-webkit-scrollbar {
    width: 4px;
}

.conversations-list::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.conversation-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition);
    margin-bottom: 2px;
    gap: 8px;
}

.conversation-item:hover {
    background: var(--bg-tertiary);
}

.conversation-item.active {
    background: var(--bg-surface);
}

.conversation-item .title {
    flex: 1;
    font-size: 13px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-item.active .title {
    color: var(--text-primary);
}

.conversation-item .delete-btn {
    opacity: 0;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: all var(--transition);
    flex-shrink: 0;
}

.conversation-item:hover .delete-btn {
    opacity: 1;
}

.conversation-item .delete-btn:hover {
    color: #ff4444;
    background: rgba(255, 68, 68, 0.1);
}

/* Sidebar user area */
.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    color: var(--text-on-accent);
    flex-shrink: 0;
}

.user-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-status {
    font-size: 11px;
    color: var(--accent);
}

.btn-logout {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    margin-left: auto;
    padding: 6px;
    border-radius: 4px;
    transition: all var(--transition);
}

.btn-logout:hover {
    color: #ff4444;
    background: rgba(255, 68, 68, 0.1);
}

/* ===== Main Chat Area ===== */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    position: relative;
}

/* Top bar */
.topbar {
    height: 56px;
    display: flex;
    align-items: center;
    padding: 0 20px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-primary);
    gap: 12px;
    flex-shrink: 0;
    width: 100%;
}

.btn-sidebar-toggle {
    display: flex;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-xs);
    transition: all var(--transition);
}

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

.topbar-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    flex: 1;
}

.topbar-right {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-topbar-login {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-topbar-login:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: rgba(0, 232, 157, 0.05);
}

.btn-topbar-login svg {
    flex-shrink: 0;
}

/* Topbar user info (logged in) */
.topbar-user {
    display: flex;
    align-items: center;
    gap: 10px;
}

.topbar-user .user-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 12px;
    color: var(--text-on-accent);
}

.topbar-user .user-name {
    font-size: 13px;
    color: var(--text-primary);
    font-weight: 500;
}

.topbar-user .btn-logout {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: all var(--transition);
    display: flex;
}

.topbar-user .btn-logout:hover {
    color: #ff4444;
}

/* ===== Welcome Screen ===== */
.welcome-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    gap: 24px;
    opacity: 1;
    transition: opacity 0.4s ease;
}

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

.welcome-logo {
    width: 180px;
    height: auto;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.welcome-text {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 600;
    color: var(--text-secondary);
    text-align: center;
    max-width: 400px;
    line-height: 1.5;
}

.welcome-text span {
    color: var(--accent);
    font-weight: 700;
}

/* Welcome centered input */
.welcome-input-area {
    width: 100%;
    max-width: 680px;
    margin-top: 32px;
}

.welcome-input-area .input-container {
    max-width: 100%;
}

.welcome-input-area .input-hint {
    text-align: center;
    font-size: 11px;
    color: #555;
    margin-top: 8px;
}

/* Hide bottom input when welcome screen is visible */

/* ===== Chat Messages ===== */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: none;
    flex-direction: column;
    gap: 4px;
}

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

.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 6px;
}

.message {
    max-width: 780px;
    width: 100%;
    margin: 0 auto;
    padding: 16px 0;
    animation: msgIn 0.3s ease;
}

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

.message-wrapper {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 14px;
    font-weight: 700;
}

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

.message.assistant .message-avatar {
    background: var(--accent);
    color: var(--text-on-accent);
}

.message-content {
    flex: 1;
    min-width: 0;
}

.message-content p {
    color: var(--text-primary);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 8px;
}

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

.message.user .message-content p {
    color: var(--text-primary);
}

.message.assistant .message-content p {
    color: var(--text-secondary);
}

/* Markdown rendered content */
.message-content h1, .message-content h2, .message-content h3 {
    color: var(--text-primary);
    margin: 16px 0 8px;
}

.message-content h1 { font-size: 22px; }
.message-content h2 { font-size: 18px; }
.message-content h3 { font-size: 16px; }

.message-content ul, .message-content ol {
    padding-left: 20px;
    margin: 8px 0;
    color: var(--text-secondary);
}

.message-content li {
    margin-bottom: 4px;
    line-height: 1.6;
}

.message-content code {
    background: var(--bg-surface);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 13px;
    color: var(--accent);
}

.message-content pre {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
    overflow-x: auto;
    margin: 12px 0;
}

.message-content pre code {
    background: none;
    padding: 0;
    font-size: 13px;
    color: var(--text-primary);
}

.message-content a {
    color: var(--accent);
    text-decoration: none;
}

.message-content a:hover {
    text-decoration: underline;
}

.message-content img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    margin: 8px 0;
}

.message-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 16px;
    margin: 12px 0;
    color: var(--text-secondary);
    font-style: italic;
}

/* ===== Typing indicator ===== */
.typing-indicator {
    display: none;
    max-width: 780px;
    width: 100%;
    margin: 0 auto;
    padding: 16px 0;
}

.typing-indicator.active {
    display: block;
}

.typing-dots {
    display: flex;
    gap: 6px;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    width: fit-content;
    margin-left: 46px;
}

.typing-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    animation: typingBounce 1.4s ease-in-out infinite;
}

.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-8px); opacity: 1; }
}

/* ===== Input Area ===== */
.input-area {
    padding: 16px 20px 24px;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
    display: none;
}

.input-area.active {
    display: block;
}

.input-container {
    max-width: 780px;
    margin: 0 auto;
    display: flex;
    align-items: flex-end;
    gap: 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px 12px;
    transition: border-color var(--transition);
}

.input-container:focus-within {
    border-color: var(--accent);
}

.input-container textarea {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.5;
    resize: none;
    outline: none;
    max-height: 150px;
    min-height: 24px;
    padding: 6px 0;
}

.input-container textarea::placeholder {
    color: #666;
}

.input-actions {
    display: flex;
    gap: 4px;
    align-items: center;
    flex-shrink: 0;
    padding-bottom: 4px;
}

.btn-attach, .btn-send {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-xs);
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-attach {
    color: var(--text-secondary);
}

.btn-attach:hover {
    color: var(--accent);
    background: rgba(0, 232, 157, 0.1);
}

.btn-send {
    background: var(--accent);
    color: var(--text-on-accent);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    opacity: 0.4;
    pointer-events: none;
    transition: all var(--transition);
}

.btn-send.active {
    opacity: 1;
    pointer-events: all;
}

.btn-send.active:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

.btn-send svg {
    width: 18px;
    height: 18px;
}

.file-preview {
    display: none;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: var(--bg-surface);
    border-radius: var(--radius-xs);
    margin-bottom: 8px;
    max-width: 780px;
    margin-left: auto;
    margin-right: auto;
}

.file-preview.active {
    display: flex;
}

.file-preview .file-name {
    font-size: 13px;
    color: var(--text-secondary);
    flex: 1;
}

.file-preview .file-remove {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 2px;
}

.file-preview .file-remove:hover {
    color: #ff4444;
}

.input-hint {
    text-align: center;
    font-size: 11px;
    color: #555;
    margin-top: 8px;
    max-width: 780px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== Login Modal ===== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px;
    width: 100%;
    max-width: 420px;
    margin: 20px;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-logo {
    width: 100px;
    margin: 0 auto 24px;
    display: block;
}

.modal h2 {
    font-family: var(--font-heading);
    font-size: 22px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
}

.modal p {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 28px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    padding: 12px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 14px;
    outline: none;
    transition: border-color var(--transition);
}

.form-group input:focus {
    border-color: var(--accent);
}

.form-group input::placeholder {
    color: #555;
}

.btn-login {
    width: 100%;
    padding: 14px;
    background: var(--accent);
    color: var(--text-on-accent);
    border: none;
    border-radius: var(--radius-xs);
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 8px;
}

.btn-login:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-login:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.login-error {
    display: none;
    color: #ff4444;
    font-size: 13px;
    text-align: center;
    margin-top: 12px;
}

.login-error.active {
    display: block;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
}

.btn-guest {
    display: block;
    text-align: center;
    color: var(--text-secondary);
    font-size: 13px;
    margin-top: 16px;
    cursor: pointer;
    background: none;
    border: none;
    font-family: var(--font-body);
    transition: color var(--transition);
    width: 100%;
}

.btn-guest:hover {
    color: var(--accent);
}

/* Sidebar login button */
.btn-sidebar-login {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px;
    margin: 0;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-on-accent);
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-sidebar-login:hover {
    background: var(--accent-hover);
}

/* Trial banner */
.trial-banner {
    display: none;
    padding: 10px 20px;
    background: linear-gradient(90deg, rgba(0, 232, 157, 0.1), rgba(0, 232, 157, 0.05));
    border-bottom: 1px solid rgba(0, 232, 157, 0.2);
    text-align: center;
    font-size: 13px;
    color: var(--accent);
}

.trial-banner.active {
    display: block;
}

.trial-banner a {
    color: var(--accent);
    font-weight: 600;
    text-decoration: underline;
    cursor: pointer;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .welcome-logo {
        width: 140px;
    }

    .welcome-text {
        font-size: 17px;
    }

    .message {
        padding: 12px 0;
    }

    .modal {
        padding: 28px;
    }

    .btn-topbar-login span {
        display: none;
    }
}

/* Sidebar overlay for mobile */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
}

.sidebar-overlay.active {
    display: block;
}

/* ===== Accent bar top ===== */
.accent-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent);
    z-index: 9999;
}

/* ===== Scrollbar global ===== */
::-webkit-scrollbar {
    width: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* ===== Loading spinner ===== */
.spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid var(--text-on-accent);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Typewriter effect */
.typewriter-cursor::after {
    content: '\258C';
    color: var(--accent);
    animation: blink 0.7s step-end infinite;
    margin-left: 1px;
}

@keyframes blink {
    50% { opacity: 0; }
}

/* PDF embed */
.message-content .pdf-embed {
    width: 100%;
    height: 500px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin: 12px 0;
}

/* ===== Checkout Button ===== */
.checkout-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 28px;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: #0D0D0D;
    font-weight: 700;
    font-size: 15px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    margin: 16px 0;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 232, 157, 0.25);
}

.checkout-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(0, 232, 157, 0.4);
}

.checkout-btn:active {
    transform: translateY(0);
}

.checkout-btn svg {
    flex-shrink: 0;
}

/* ===== Checkout Sidebar Panel ===== */
.checkout-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 9998;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    backdrop-filter: blur(4px);
}

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

.checkout-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 480px;
    max-width: 100%;
    height: 100vh;
    background: var(--bg-secondary);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: -5px 0 30px rgba(0, 0, 0, 0.5);
}

.checkout-panel.open {
    transform: translateX(0);
}

.checkout-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.checkout-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.checkout-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 6px;
    border-radius: 8px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.checkout-close:hover {
    background: var(--bg-surface);
    color: var(--text-primary);
}

.checkout-body {
    flex: 1;
    overflow: hidden;
}

.checkout-body iframe {
    width: 100%;
    height: 100%;
    border: none;
    background: #fff;
}

/* Checkout loading state */
.checkout-body.loading::after {
    content: '';
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
}

@media (max-width: 540px) {
    .checkout-panel {
        width: 100%;
    }
}