/* ChatGPT Cloud SaaS - Modern ChatGPT-style UI */

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

:root {
    --bg-primary: #343541;
    --bg-secondary: #40414f;
    --bg-tertiary: #202123;
    --bg-sidebar: #202123;
    --text-primary: #ececf1;
    --text-secondary: #8e8ea0;
    --border-color: #565869;
    --accent-color: #10a37f;
    --accent-hover: #0d8f6e;
    --user-message-bg: #343541;
    --bot-message-bg: #444654;
    --input-bg: #40414f;
    --input-border: #565869;
    --error-color: #ef4444;
    --success-color: #10b981;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== AUTH SECTION ===== */
.auth-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-primary) 100%);
}

.auth-container {
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: 12px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-header h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.auth-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.auth-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 12px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    transition: all 0.2s;
    margin-bottom: -1px;
}

.tab-btn.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
    font-weight: 500;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    padding: 12px 16px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 14px;
    color: var(--text-primary);
    transition: all 0.2s;
    font-family: inherit;
}

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

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

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: inherit;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 12px;
}

.error-message {
    color: var(--error-color);
    font-size: 13px;
    min-height: 20px;
    margin-top: -8px;
}

/* ===== CHAT SECTION ===== */
.chat-section {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.btn-new-chat {
    width: 100%;
    padding: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}

.btn-new-chat:hover {
    background: var(--bg-tertiary);
}

.btn-new-chat span {
    font-size: 18px;
    font-weight: 300;
}

.sidebar-footer {
    margin-top: auto;
    padding: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.usage-info {
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-radius: 6px;
    font-size: 12px;
    color: var(--text-secondary);
    text-align: center;
}

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

.chat-messages {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0;
    display: flex;
    flex-direction: column;
}

/* Message Styles */
.message {
    display: flex;
    padding: 24px 0;
    animation: fadeIn 0.3s ease-in;
}

.message.user-message {
    background: var(--user-message-bg);
}

.message.bot-message {
    background: var(--bot-message-bg);
}

.message-wrapper {
    max-width: 768px;
    width: 100%;
    margin: 0 auto;
    padding: 0 48px;
    display: flex;
    gap: 24px;
}

.message-avatar {
    width: 30px;
    height: 30px;
    border-radius: 2px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

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

.bot-message .message-avatar {
    background: var(--accent-color);
    color: white;
}

.message-content {
    flex: 1;
    min-width: 0;
    padding-top: 4px;
}

.message-content p {
    margin: 0;
    white-space: pre-wrap;
    word-wrap: break-word;
    line-height: 1.75;
    color: var(--text-primary);
    font-size: 16px;
}

/* Welcome Message */
.welcome-message {
    max-width: 768px;
    margin: 0 auto;
    padding: 48px 24px;
    text-align: center;
}

.welcome-message h2 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.welcome-message p {
    font-size: 16px;
    color: var(--text-secondary);
}

/* Chat Input */
.chat-input-wrapper {
    padding: 24px;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.chat-form {
    max-width: 768px;
    margin: 0 auto;
}

.input-container {
    position: relative;
    display: flex;
    align-items: flex-end;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 24px;
    padding: 12px 48px 12px 48px;
    transition: all 0.2s;
    gap: 8px;
}

.input-container:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(16, 163, 127, 0.1);
}

#chatInput {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    font-family: inherit;
    resize: none;
    max-height: 200px;
    min-height: 24px;
    line-height: 24px;
    padding: 0;
    outline: none;
}

.btn-file-upload {
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
    border-radius: 50%;
}

.btn-file-upload:hover:not(:disabled) {
    color: var(--accent-color);
    background: rgba(16, 163, 127, 0.1);
}

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

.file-info {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: var(--input-bg);
    border-radius: 8px;
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.file-info span {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.btn-remove-file {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 20px;
    line-height: 1;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    border-radius: 50%;
}

.btn-remove-file:hover {
    color: var(--error-color);
    background: rgba(239, 68, 68, 0.1);
}

#chatInput::placeholder {
    color: var(--text-secondary);
}

#chatInput:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-send {
    position: absolute;
    right: 8px;
    bottom: 8px;
    width: 32px;
    height: 32px;
    background: var(--accent-color);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.btn-send:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: scale(1.05);
}

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

.input-footer {
    text-align: center;
    margin-top: 12px;
}

.input-footer p {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Loading Indicator */
.loading-indicator {
    max-width: 768px;
    margin: 0 auto;
    padding: 24px 48px;
    background: var(--bot-message-bg);
}

.loading-dots {
    display: flex;
    gap: 8px;
    align-items: center;
}

.loading-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-secondary);
    animation: loadingDot 1.4s infinite ease-in-out;
}

.loading-dots span:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dots span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes loadingDot {
    0%, 80%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    40% {
        transform: scale(1);
        opacity: 1;
    }
}

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

/* Scrollbar */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

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

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

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }

    .message-wrapper {
        padding: 0 16px;
    }

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

    .welcome-message {
        padding: 32px 16px;
    }

    .welcome-message h2 {
        font-size: 24px;
    }

    .input-container {
        padding: 10px 40px 10px 12px;
    }

    .btn-send {
        width: 28px;
        height: 28px;
        right: 6px;
        bottom: 6px;
    }

    .loading-indicator {
        padding: 16px;
    }
}

@media (max-width: 480px) {
    .auth-container {
        padding: 24px;
    }

    .auth-header h1 {
        font-size: 24px;
    }

    .message-content p {
        font-size: 14px;
    }
}