/* ============================================
   VARIABLES Y RESET
   ============================================ */
:root {
    /* Escala de grises */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --bg-tertiary: #353535;
    
    --text-primary: #f5f5f5;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    
    /* Calipso suave */
    --accent-primary: #4FD1C5;
    --accent-dim: rgba(79, 209, 197, 0.1);
    --accent-border: rgba(79, 209, 197, 0.3);
    
    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    
    /* Tipografía */
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   LAYOUT PRINCIPAL
   ============================================ */
.container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 100%;
}

/* ============================================
   HEADER
   ============================================ */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--accent-border);
    flex-shrink: 0;
}

header h1 {
    font-size: 1.25rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    color: var(--text-primary);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.mode-toggle {
    background-color: transparent;
    border: 1px solid var(--accent-border);
    border-radius: 6px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0;
}

.mode-toggle svg {
    color: var(--text-tertiary);
    transition: color 0.2s ease;
}

.mode-toggle:hover {
    border-color: var(--accent-primary);
}

.mode-toggle:hover svg {
    color: var(--accent-primary);
}

.mode-toggle.active {
    background-color: var(--accent-dim);
    border-color: var(--accent-primary);
}

.mode-toggle.active svg {
    color: var(--accent-primary);
}

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

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--accent-primary);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ============================================
   ÁREA DE CHAT
   ============================================ */
main {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--spacing-md);
    scroll-behavior: smooth;
}

.messages {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding-bottom: var(--spacing-md);
}

/* ============================================
   MENSAJES
   ============================================ */
.message {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    animation: fadeIn 0.3s ease-out;
}

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

.message-header {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    padding-left: var(--spacing-xs);
}

.message-content {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 12px;
    line-height: 1.6;
    font-size: 0.95rem;
}

.message.user .message-content {
    background-color: var(--bg-tertiary);
    border-left: 3px solid var(--accent-primary);
    color: var(--text-primary);
}

.message.assistant .message-content {
    background-color: var(--bg-secondary);
    border-left: 3px solid var(--accent-border);
    color: var(--text-secondary);
}

.message.system .message-content {
    background-color: var(--accent-dim);
    border-left: 3px solid var(--accent-primary);
    color: var(--accent-primary);
    font-size: 0.875rem;
    text-align: center;
}

/* Indicador de escritura */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border-left: 3px solid var(--accent-border);
    border-radius: 12px;
    width: fit-content;
}

.typing-indicator span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--text-tertiary);
    animation: typing 1.4s ease-in-out infinite;
}

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

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

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

/* ============================================
   FOOTER - ÁREA DE ENTRADA
   ============================================ */
footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--accent-border);
    padding: var(--spacing-sm) var(--spacing-md);
    flex-shrink: 0;
}

.input-container {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-end;
}

.voice-button {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--accent-border);
    border-radius: 8px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.voice-button svg {
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.voice-button:hover {
    background-color: var(--accent-dim);
    border-color: var(--accent-primary);
}

.voice-button:hover svg {
    color: var(--accent-primary);
}

.voice-button.recording {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    animation: recordingPulse 1s ease-in-out infinite;
}

.voice-button.recording svg {
    color: var(--bg-primary);
}

@keyframes recordingPulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 var(--accent-primary);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 0 8px transparent;
    }
}

textarea {
    flex: 1;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--accent-border);
    border-radius: 8px;
    padding: var(--spacing-sm);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 0.95rem;
    line-height: 1.5;
    resize: none;
    max-height: 120px;
    min-height: 44px;
    transition: border-color 0.2s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

textarea::placeholder {
    color: var(--text-tertiary);
}

button {
    background-color: var(--accent-primary);
    border: none;
    border-radius: 8px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

button:hover {
    background-color: #3fb8ad;
    transform: scale(1.05);
}

button:active {
    transform: scale(0.95);
}

button svg {
    color: var(--bg-primary);
}

button:disabled {
    background-color: var(--bg-tertiary);
    cursor: not-allowed;
    opacity: 0.5;
}

button:disabled:hover {
    transform: none;
}

/* ============================================
   SCROLLBAR PERSONALIZADA
   ============================================ */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-border);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 480px) {
    header {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    header h1 {
        font-size: 1.1rem;
    }
    
    main {
        padding: var(--spacing-sm);
    }
    
    .message-content {
        font-size: 0.9rem;
    }
}