/* RESET Y VARIABLES GLOBALES */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg-primary: #0d0d0d;
    --color-bg-secondary: #1a1a1a;
    --color-bg-tertiary: #2a2a2a;
    --color-text-primary: #ececec;
    --color-text-secondary: #b4b4b4;
    --color-accent: #10a37f;
    --color-accent-hover: #0d9469;
    --color-border: #3a3a3a;
    --color-user-msg: #1a1a2e;
    --color-assistant-msg: #16213e;
    --color-error: #e74c3c;
    
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    
    --sidebar-width: 260px;
    --mobile-breakpoint: 768px;
}

html, body {
    width: 100%;
    height: 100%;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
    font-size: 15px;
    line-height: 1.5;
}

/* PANTALLA DE LOGIN */
.login-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #0d0d0d 0%, #1a1a1a 100%);
}

.login-container {
    width: 100%;
    max-width: 360px;
    padding: var(--spacing-lg);
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    font-size: 32px;
    font-weight: 900;
    color: var(--color-accent);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
}

.login-header h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

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

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.login-form input {
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border-radius: var(--radius-md);
    font-size: 15px;
    transition: all var(--transition-fast);
}

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

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

.login-form button {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-accent);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition-fast);
    font-size: 15px;
}

.login-form button:hover {
    background: var(--color-accent-hover);
}

.login-form button:active {
    transform: scale(0.98);
}

.login-error {
    color: var(--color-error);
    font-size: 14px;
    text-align: center;
    min-height: 20px;
}

.login-footer {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 12px;
}

/* PANTALLA PRINCIPAL */
.app-screen {
    display: flex;
    width: 100%;
    height: 100%;
}

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

/* SIDEBAR */
.sidebar {
    width: var(--sidebar-width);
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal);
    z-index: 100;
}

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

.sidebar-header h2 {
    font-size: 18px;
    font-weight: 600;
    flex: 1;
}

.new-chat-btn,
.sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 18px;
}

.new-chat-btn:hover,
.sidebar-toggle:hover {
    background: var(--color-border);
}

.sidebar-toggle {
    display: none;
}

.conversation-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.conversation-item {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background: var(--color-bg-tertiary);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 14px;
    color: var(--color-text-secondary);
}

.conversation-item:hover {
    background: var(--color-border);
    color: var(--color-text-primary);
}

.conversation-item.active {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

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

.logout-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 14px;
    transition: all var(--transition-fast);
}

.logout-btn:hover {
    background: var(--color-error);
    border-color: var(--color-error);
}

/* CHAT MAIN */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

.mobile-header {
    display: none;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    align-items: center;
    justify-content: space-between;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-size: 20px;
    cursor: pointer;
}

/* CONTENEDOR DE MENSAJES */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

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

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

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

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

/* WELCOME MESSAGE */
.welcome-message {
    text-align: center;
    padding: var(--spacing-xl);
    max-width: 500px;
    margin: auto;
}

.welcome-message h2 {
    font-size: 32px;
    margin-bottom: var(--spacing-md);
}

.welcome-message p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.welcome-suggestions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.suggestion-btn {
    padding: var(--spacing-md);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 14px;
}

.suggestion-btn:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #fff;
}

/* MENSAJES */
.message {
    display: flex;
    animation: fadeIn var(--transition-normal);
}

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

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

.message.assistant {
    justify-content: flex-start;
}

.message-content {
    max-width: 70%;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.message.user .message-content {
    background: var(--color-user-msg);
    color: var(--color-text-primary);
    border: 1px solid var(--color-accent);
}

.message.assistant .message-content {
    background: var(--color-assistant-msg);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

/* MARKDOWN EN MENSAJES */
.message-content h1,
.message-content h2,
.message-content h3 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.message-content h1 {
    font-size: 20px;
}

.message-content h2 {
    font-size: 18px;
}

.message-content h3 {
    font-size: 16px;
}

.message-content p {
    margin-bottom: var(--spacing-sm);
}

.message-content ul,
.message-content ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.message-content li {
    margin-bottom: var(--spacing-xs);
}

.message-content code {
    background: rgba(0, 0, 0, 0.3);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: "Monaco", "Courier New", monospace;
    font-size: 13px;
}

.message-content pre {
    background: rgba(0, 0, 0, 0.5);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--spacing-sm) 0;
}

.message-content pre code {
    background: none;
    padding: 0;
    border-radius: 0;
}

.message-content blockquote {
    border-left: 3px solid var(--color-accent);
    padding-left: var(--spacing-md);
    margin: var(--spacing-sm) 0;
    color: var(--color-text-secondary);
}

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

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

/* THINKING INDICATOR */
.thinking-indicator {
    display: flex;
    gap: 4px;
    padding: var(--spacing-md) var(--spacing-lg);
    align-items: center;
}

.thinking-indicator.hidden {
    display: none;
}

.thinking-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-accent);
    animation: bounce 1.4s infinite;
}

.thinking-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.thinking-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes bounce {
    0%, 80%, 100% {
        opacity: 0.3;
    }
    40% {
        opacity: 1;
    }
}

/* INPUT CONTAINER */
.chat-input-container {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-primary);
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
    margin-bottom: var(--spacing-sm);
}

.message-input {
    flex: 1;
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 15px;
    resize: none;
    max-height: 200px;
    transition: all var(--transition-fast);
}

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

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

.send-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-accent);
    border: none;
    border-radius: var(--radius-md);
    color: #fff;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

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

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

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

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

/* RESPONSIVE */
@media (max-width: 768px) {
    :root {
        --sidebar-width: 100%;
    }

    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100%;
        transform: translateX(-100%);
        border-right: none;
        border-left: 1px solid var(--color-border);
        max-width: 260px;
        width: 70vw;
    }

    .sidebar.visible {
        transform: translateX(0);
    }

    .sidebar-toggle {
        display: flex;
    }

    .mobile-header {
        display: flex;
    }

    .mobile-menu-btn {
        display: block;
    }

    .messages-container {
        padding: var(--spacing-md);
    }

    .message-content {
        max-width: 85%;
    }

    .chat-input-container {
        padding: var(--spacing-md);
    }

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

@media (max-width: 480px) {
    .message-content {
        max-width: 100%;
    }

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

    .login-container {
        padding: var(--spacing-md);
    }
}

/* UTILITIES */
.hidden {
    display: none !important;
}