:root {
    --bg-color: #1e1a17;
    --panel-bg: rgba(43, 36, 31, 0.8);
    --panel-border: rgba(110, 75, 52, 0.3);
    --text-primary: #F1E4CE;
    --text-secondary: #c2b59f;
    --accent-beta: #E0A458;  /* Amber/Orange */
    --accent-gamma: #5DA9E9; /* Electric Blue */
    --accent-alpha: #7C9A81; /* Sage Green */
    --btn-bg: #40352e;
    --btn-hover: #54463d;
    --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

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

/* Overlay / Onboarding */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(30, 26, 23, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: var(--transition);
}

.onboarding-card {
    background: radial-gradient(circle at top left, #382e27, #251e19);
    border: 1px solid var(--panel-border);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow);
    animation: fadeInUp 0.6s ease-out;
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
}

.brain-logo {
    font-size: 3rem;
    color: var(--accent-beta);
    margin-bottom: 10px;
    animation: pulseLogo 3s infinite ease-in-out;
}

.onboarding-card h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: 1px;
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 0.95rem;
}

.onboarding-notice {
    background-color: rgba(110, 75, 52, 0.2);
    border: 1px dashed var(--accent-alpha);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 30px;
}

.headphones-icon {
    font-size: 2.5rem;
    color: var(--accent-alpha);
    margin-bottom: 12px;
}

.onboarding-notice h3 {
    margin-bottom: 8px;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.onboarding-notice p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.btn-primary {
    background-color: var(--accent-alpha);
    color: #1e1a17;
    border: none;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(124, 154, 129, 0.4);
    background-color: #8db093;
}

/* App Container */
#app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* Header */
header {
    background-color: rgba(30, 26, 23, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--panel-border);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-logo i {
    font-size: 1.5rem;
    color: var(--accent-beta);
}

.header-logo h2 {
    font-size: 1.3rem;
    font-weight: 700;
}

.state-badge {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.state-badge.beta {
    background-color: rgba(224, 164, 88, 0.15);
    color: var(--accent-beta);
    border: 1px solid rgba(224, 164, 88, 0.3);
}

.state-badge.gamma {
    background-color: rgba(93, 169, 233, 0.15);
    color: var(--accent-gamma);
    border: 1px solid rgba(93, 169, 233, 0.3);
}

.state-badge.alpha {
    background-color: rgba(124, 154, 129, 0.15);
    color: var(--accent-alpha);
    border: 1px solid rgba(124, 154, 129, 0.3);
}

/* Main Grid Layout */
.grid-layout {
    display: grid;
    grid-template-columns: 320px 1fr 320px;
    flex-grow: 1;
    overflow: hidden;
    position: relative;
}

@media (max-width: 1024px) {
    .grid-layout {
        grid-template-columns: 1fr;
        grid-template-rows: auto 400px auto;
        overflow-y: auto;
    }
    
    body {
        overflow-y: auto;
    }
    
    #app-container {
        height: auto;
        min-height: 100vh;
    }
}

/* Panels */
.panel {
    background-color: var(--panel-bg);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 20px;
    overflow-y: auto;
    z-index: 5;
}

.left-panel {
    border-right: 1px solid var(--panel-border);
}

.right-panel {
    border-left: 1px solid var(--panel-border);
}

.panel-section {
    background-color: rgba(30, 26, 23, 0.6);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    padding: 18px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.15);
}

.section-title {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(110, 75, 52, 0.2);
    padding-bottom: 8px;
}

/* Timer Card */
.timer-card {
    text-align: center;
}

.timer-display {
    font-size: 3.5rem;
    font-weight: 800;
    font-family: monospace;
    font-variant-numeric: tabular-nums;
    margin: 15px 0;
    letter-spacing: -1px;
    color: var(--text-primary);
    text-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.timer-display.ticking {
    animation: pulseTimer 1s infinite alternate;
}

.timer-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
}

.btn-icon {
    background-color: var(--btn-bg);
    color: var(--text-primary);
    border: 1px solid var(--panel-border);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: var(--transition);
}

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

.btn-icon#btn-timer-play {
    background-color: var(--accent-alpha);
    color: #1e1a17;
    border: none;
    width: 56px;
    height: 56px;
    font-size: 1.3rem;
}

.btn-icon#btn-timer-play:hover {
    background-color: #8db093;
    box-shadow: 0 0 15px rgba(124, 154, 129, 0.3);
}

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

.btn-state {
    background-color: var(--btn-bg);
    color: var(--text-secondary);
    border: 1px solid var(--panel-border);
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
}

.btn-state:hover {
    background-color: var(--btn-hover);
    color: var(--text-primary);
}

.btn-state.active {
    background-color: rgba(110, 75, 52, 0.3);
    color: var(--text-primary);
}

.btn-state[data-state="beta"].active {
    border-left: 4px solid var(--accent-beta);
}

.btn-state[data-state="gamma"].active {
    border-left: 4px solid var(--accent-gamma);
}

.btn-state[data-state="alpha"].active {
    border-left: 4px solid var(--accent-alpha);
}

/* Mixer Card */
.mixer-item {
    margin-bottom: 15px;
}

.mixer-item:last-child {
    margin-bottom: 0;
}

.mixer-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.mixer-label i {
    width: 16px;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #3a322c;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-alpha);
    cursor: pointer;
    transition: transform 0.1s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Central Viewport */
.viewport-section {
    position: relative;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, #2e2621 0%, #1e1a17 100%);
    overflow: hidden;
}

#canvas-container {
    width: 100%;
    height: 100%;
}

.viewport-overlay {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 500px;
    pointer-events: none;
    z-index: 10;
}

.info-card {
    background: rgba(30, 26, 23, 0.85);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(8px);
    border-radius: 12px;
    padding: 15px 20px;
    color: var(--text-primary);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.info-card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.info-card p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 6px;
}

.info-card small {
    font-size: 0.75rem;
    font-weight: bold;
    color: var(--accent-beta);
}

/* Stats Card */
.stat-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 20px;
}

.stat-box {
    background-color: rgba(43, 36, 31, 0.4);
    border: 1px solid rgba(110, 75, 52, 0.2);
    border-radius: 8px;
    padding: 12px;
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-primary);
}

.stat-lbl {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stats-breakdown h4 {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.breakdown-bar-container {
    height: 10px;
    background-color: #322923;
    border-radius: 5px;
    overflow: hidden;
    display: flex;
    margin-bottom: 12px;
}

.breakdown-bar {
    height: 100%;
    transition: width 0.5s ease-in-out;
}

.breakdown-bar.beta { background-color: var(--accent-beta); }
.breakdown-bar.gamma { background-color: var(--accent-gamma); }
.breakdown-bar.alpha { background-color: var(--accent-alpha); }

.breakdown-labels {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.breakdown-labels i {
    font-size: 0.6rem;
    margin-right: 4px;
}

.text-beta { color: var(--accent-beta); }
.text-gamma { color: var(--accent-gamma); }
.text-alpha { color: var(--accent-alpha); }

/* History Card */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 250px;
    overflow-y: auto;
}

.history-item {
    background-color: rgba(43, 36, 31, 0.3);
    border: 1px solid rgba(110, 75, 52, 0.15);
    border-radius: 8px;
    padding: 10px 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
}

.history-details {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.history-meta {
    font-weight: 700;
}

.history-meta.beta { color: var(--accent-beta); }
.history-meta.gamma { color: var(--accent-gamma); }
.history-meta.alpha { color: var(--accent-alpha); }

.history-time {
    color: var(--text-secondary);
    font-size: 0.7rem;
}

.history-duration {
    background-color: rgba(241, 228, 206, 0.1);
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: bold;
}

.no-data {
    color: var(--text-secondary);
    text-align: center;
    font-size: 0.8rem;
    padding: 15px 0;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulseLogo {
    0%, 100% {
        transform: scale(1);
        text-shadow: 0 0 10px rgba(224, 164, 88, 0);
    }
    50% {
        transform: scale(1.05);
        text-shadow: 0 0 20px rgba(224, 164, 88, 0.5);
    }
}

@keyframes pulseTimer {
    from {
        transform: scale(1);
    }
    to {
        transform: scale(1.03);
    }
}

/* --- Nuevos Estilos de la Etapa 1 Polishing --- */

.header-status {
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-help {
    background-color: var(--btn-bg);
    color: var(--text-secondary);
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    padding: 6px 14px;
    font-size: 0.75rem;
    font-weight: bold;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.btn-help:hover {
    background-color: var(--btn-hover);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.viewport-overlay {
    pointer-events: none; /* Dejar pasar los clicks a Three.js para OrbitControls */
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.info-card {
    pointer-events: auto; /* Permitir interacciones en las tarjetas */
}

/* Recomendaciones Card */
#recommendation-card {
    border-left: 4px solid var(--accent-beta);
}

#recommendation-card h4 {
    color: var(--accent-beta);
}

#recommendation-card p {
    font-size: 0.8rem;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 0;
}

/* Wave Monitor Canvas */
#visualizer-card {
    padding: 10px 15px;
    border-left: 4px solid var(--accent-gamma);
}

.visualizer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
    font-weight: bold;
}

#visualizer-wave-label {
    color: var(--accent-gamma);
}

#wave-canvas {
    width: 100%;
    height: 40px;
    display: block;
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 6px;
    border: 1px solid rgba(110, 75, 52, 0.1);
}

/* Modales */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(20, 17, 15, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    transition: opacity 0.3s ease;
    opacity: 1;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: radial-gradient(circle at top left, #382e27, #251e19);
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    width: 90%;
    max-width: 600px;
    box-shadow: var(--shadow);
    animation: fadeInUp 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    overflow: hidden;
}

.modal-header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--panel-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-close-btn {
    font-size: 1.8rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
}

.modal-close-btn:hover {
    color: var(--text-primary);
    transform: scale(1.1);
}

.modal-body {
    padding: 24px;
    max-height: 70vh;
    overflow-y: auto;
}

.modal-body p {
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.modal-wave-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.wave-card {
    background-color: rgba(30, 26, 23, 0.4);
    border: 1px solid rgba(110, 75, 52, 0.15);
    border-radius: 8px;
    padding: 12px 16px;
}

.wave-card h3 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.wave-card p {
    font-size: 0.78rem;
    line-height: 1.4;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.wave-card p:last-child {
    margin-bottom: 0;
}

.modal-footer-notice {
    background-color: rgba(124, 154, 129, 0.1);
    border: 1px dashed var(--accent-alpha);
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 0.78rem;
    color: var(--text-primary);
}