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

:root {
    --primary-color: #10a37f;
    --primary-hover: #0d8a6b;
    --primary-light: rgba(16, 163, 127, 0.1);
    --secondary-color: #19c37d;
    --bg-dark: #1e1e1e;
    --bg-darker: #171717;
    --bg-light: #2a2a2a;
    --sidebar-bg: #0f0f0f;
    --text-primary: #ffffff;
    --text-secondary: #b4b4b4;
    --border-color: #404040;
    --hover-bg: #2d2d2d;
    --message-user-bg: #2a2a2a;
    --message-ai-bg: #1e1e1e;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.4);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #0f0f0f 0%, #1a1a1a 100%);
    color: var(--text-primary);
    overflow: hidden;
    line-height: 1.6;
}

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

.container {
    display: flex;
    height: 100vh;
    width: 100%;
    animation: fadeInPage 0.5s ease-out;
}

/* Sidebar Styles */
.sidebar {
    width: 280px;
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 2px 0 12px rgba(0, 0, 0, 0.5);
}

.sidebar-header {
    padding: 17.5px 20px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h1 {
    font-size: 22px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.sidebar-header .subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 6px;
    font-weight: 400;
}

.new-chat-btn {
    margin: 16px;
    padding: 14px 20px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #0d8a6b 100%);
    border: none;
    border-radius: 10px;
    color: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(16, 163, 127, 0.3);
}

.new-chat-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(16, 163, 127, 0.4);
    background: linear-gradient(135deg, #0d8a6b 0%, var(--primary-color) 100%);
}

.chat-history {
    flex: 1;
    overflow-y: auto;
    padding: 10px 15px;
}

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

.chat-history::-webkit-scrollbar-track {
    background: transparent;
}

.chat-history::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 10px;
}

.chat-history::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

.chat-history h3 {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.history-item {
    padding: 12px 14px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-secondary);
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.history-item-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    cursor: pointer;
}

.delete-chat-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    opacity: 0;
    transition: all 0.2s ease;
    font-size: 12px;
    flex-shrink: 0;
}

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

.delete-chat-btn:hover {
    background: rgba(220, 53, 69, 0.2);
    color: #dc3545;
}

.history-item:hover {
    background-color: var(--hover-bg);
    color: var(--text-primary);
    transform: translateX(4px);
}

.history-item.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, #0d8a6b 100%);
    color: white;
    font-weight: 600;
}

.sidebar-footer {
    padding: 15px;
    border-top: 1px solid var(--border-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
    font-size: 14px;
    margin-bottom: 12px;
    padding: 12px 16px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.user-info:hover {
    background: var(--hover-bg);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.user-info i {
    font-size: 24px;
}

.user-info span {
    flex: 1;
}

.profile-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0;
}

.user-info:hover .profile-btn {
    color: var(--primary-color);
}

.auth-buttons {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.auth-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.auth-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.auth-btn i {
    font-size: 14px;
}

/* Main Chat Area */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-dark);
}

.chat-header {
    padding: 24px 32px;
    background: var(--bg-darker);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    min-height: 76px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-title-section {
    display: flex;
    flex-direction: column;
    gap: 4px;
    text-align: right;
    align-items: flex-end;
}

.chat-header h2 {
    font-size: 19px;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-color) 0%, #19c37d 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.header-subtitle {
    font-size: 9px;
    color: var(--text-secondary);
    margin: 0;
    font-weight: 400;
    opacity: 0.6;
}

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 22px;
    cursor: pointer;
    padding: 10px;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.mobile-menu-btn:hover {
    background: var(--hover-bg);
    color: var(--primary-color);
    transform: scale(1.05);
}

.header-actions {
    display: flex;
    gap: 10px;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    padding: 10px;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background-color: var(--hover-bg);
    color: var(--primary-color);
    transform: scale(1.05);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.chat-messages::-webkit-scrollbar {
    width: 10px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--bg-darker);
    border-radius: 10px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--border-color) 0%, var(--hover-bg) 100%);
    border-radius: 10px;
    border: 2px solid var(--bg-darker);
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, #19c37d 100%);
}

/* Welcome Screen */
.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    padding: 48px;
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
}

.welcome-icon {
    font-size: 80px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #19c37d 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
    animation: float 3s ease-in-out infinite;
}

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

.welcome-screen h2 {
    font-size: 36px;
    margin-bottom: 16px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-screen p {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 48px;
    max-width: 650px;
    line-height: 1.7;
}

.suggestions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 900px;
    width: 100%;
}

.suggestion-card {
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-dark) 100%);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: left;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.suggestion-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, #19c37d 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.suggestion-card:hover::before {
    opacity: 0.1;
}

.suggestion-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(16, 163, 127, 0.2);
}

.suggestion-card > * {
    position: relative;
    z-index: 1;
}

.suggestion-card i {
    font-size: 28px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #19c37d 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
    display: block;
}

.suggestion-card h4 {
    font-size: 17px;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 600;
}

.suggestion-card p {
    font-size: 14px;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
}

/* Message Styles */
.message {
    margin-bottom: 24px;
    padding: 28px;
    border-radius: 16px;
    animation: fadeIn 0.4s ease;
    max-width: 900px;
    width: 100%;
    box-shadow: var(--shadow);
}

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

.message.user {
    background: linear-gradient(135deg, var(--message-user-bg) 0%, var(--bg-dark) 100%);
    border: 1px solid var(--border-color);
    align-self: flex-end;
}

.message.ai {
    background: linear-gradient(135deg, var(--message-ai-bg) 0%, var(--bg-darker) 100%);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--primary-color);
    align-self: flex-start;
}

.message-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.message.user .message-avatar {
    background: linear-gradient(135deg, var(--primary-color) 0%, #19c37d 100%);
    color: white;
}

.message.ai .message-avatar {
    background: linear-gradient(135deg, #5436da 0%, #7c3aed 100%);
    color: white;
}

.message-sender {
    font-weight: 700;
    font-size: 15px;
    letter-spacing: 0.3px;
}

.message-content {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-primary);
}

.typing-indicator {
    display: flex;
    gap: 5px;
    padding: 10px 0;
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-secondary);
    animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.5;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* Chat Input */
.chat-input-container {
    padding: 24px 32px;
    background: var(--bg-darker);
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.2);
}

.chat-input-form {
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 900px;
    margin: 0 auto;
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-dark) 100%);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 12px 16px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.chat-input-form:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light), var(--shadow-lg);
}

.message-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    resize: none;
    outline: none;
    max-height: 200px;
    font-family: inherit;
    line-height: 1.6;
    padding: 0;
}

.message-input::placeholder {
    color: var(--text-secondary);
}

.send-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, #19c37d 100%);
    border: none;
    color: white;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(16, 163, 127, 0.3);
}

.send-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 16px rgba(16, 163, 127, 0.4);
    background: linear-gradient(135deg, #19c37d 0%, var(--primary-color) 100%);
}

.send-btn:disabled {
    background: var(--border-color);
    cursor: not-allowed;
    opacity: 0.5;
    box-shadow: none;
}

.send-btn:not(:disabled) {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 4px 12px rgba(16, 163, 127, 0.3); }
    50% { box-shadow: 0 4px 16px rgba(16, 163, 127, 0.5); }
}

.input-hint {
    text-align: center;
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 12px;
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100vh;
        z-index: 1000;
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }
    
    .sidebar.open::after {
        content: '';
        position: fixed;
        top: 0;
        left: 280px;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.7);
        z-index: -1;
    }

    .suggestions {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .welcome-screen {
        padding: 24px 16px;
    }

    .welcome-screen h2 {
        font-size: 28px;
    }

    .welcome-icon {
        font-size: 64px;
    }

    .message {
        padding: 20px;
        margin-bottom: 16px;
    }

    .message.user,
    .message.ai {
        margin-left: 0;
        margin-right: 0;
    }

    .chat-messages {
        padding: 16px;
    }

    .chat-input-container {
        padding: 16px;
    }

    .chat-header {
        padding: 16px;
    }

    .chat-header h2 {
        font-size: 16px;
    }
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-dark) 100%);
    margin: 5% auto;
    padding: 32px;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 90%;
    max-width: 450px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-content h2 {
    color: var(--text-primary);
    margin-bottom: 24px;
    font-size: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.close {
    color: var(--text-secondary);
    float: right;
    font-size: 32px;
    font-weight: bold;
    line-height: 1;
    cursor: pointer;
    transition: color 0.2s ease;
}

.close:hover {
    color: var(--primary-color);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 15px;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 163, 127, 0.1);
}

.modal-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #19c37d 100%);
    border: none;
    border-radius: 10px;
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.3s ease;
    margin-top: 8px;
}

.modal-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 163, 127, 0.4);
}

.modal-footer-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 20px;
}

.modal-footer-text a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.modal-footer-text a:hover {
    text-decoration: underline;
}

/* Profile Modal Styles - ChatGPT Minimal Style */
.profile-modal-minimal {
    max-width: 400px;
    padding: 0;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
}

.profile-minimal-header {
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.profile-minimal-header h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.profile-minimal-content {
    padding: 24px;
}

.profile-user-section {
    display: flex;
    align-items: center;
    gap: 16px;
}

.profile-user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 600;
    color: white;
    flex-shrink: 0;
}

.profile-user-details {
    flex: 1;
    min-width: 0;
}

.profile-user-details h4 {
    margin: 0 0 4px 0;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.profile-user-details p {
    margin: 0;
    font-size: 13px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.profile-divider {
    height: 1px;
    background: var(--border-color);
    margin: 20px 0;
}

.profile-info-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.profile-info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.info-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.info-value {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 500;
}

.profile-logout-minimal {
    width: 100%;
    padding: 12px 16px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.profile-logout-minimal:hover {
    background: var(--hover-bg);
    border-color: #dc3545;
    color: #dc3545;
}

/* Hide old profile styles */
.profile-modal,
.profile-header,
.profile-stats,
.stat-card,
.profile-actions,
.profile-info {
    display: none;
}