:root {
    --bg-color: #0d1117;
    --card-bg: rgba(22, 27, 34, 0.7);
    --gold: #d4af37;
    --teal: #20c997;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --border-glass: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    overflow-x: hidden;
    min-height: 100vh;
}

/* 💎 Estética Norte: Glows e Grade */
.luxury-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(var(--border-glass) 1px, transparent 1px),
                      linear-gradient(90deg, var(--border-glass) 1px, transparent 1px);
    background-size: 30px 30px;
    opacity: 0.03;
    pointer-events: none;
    z-index: 1;
}

.glow {
    position: fixed;
    width: 50vw;
    height: 50vw;
    filter: blur(100px);
    opacity: 0.15;
    pointer-events: none;
    z-index: 0;
}

.teal-glow {
    top: -10%;
    left: -10%;
    background: radial-gradient(circle, var(--teal), transparent 70%);
}

.gold-glow {
    top: -10%;
    right: -10%;
    background: radial-gradient(circle, var(--gold), transparent 70%);
}

/* --- HUB CENTRAL STYLES --- */
#hub-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem;
    transition: opacity 0.5s ease, transform 0.5s ease;
}

#hub-container.hidden {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.95);
    display: none;
}

.hub-header {
    text-align: center;
    margin-bottom: 4rem;
}

.hub-badge {
    background: var(--gold);
    color: #000;
    padding: 0.3rem 1rem;
    border-radius: 50px;
    font-size: 0.7rem;
    font-weight: bold;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.hub-title {
    font-size: 3rem;
    font-weight: 200;
    margin: 1.5rem 0 0.5rem;
    letter-spacing: -1px;
}

.hub-subtitle {
    color: var(--text-secondary);
}

.hub-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    width: 100%;
}

.lesson-card {
    position: relative;
    padding: 2rem;
    cursor: pointer;
    overflow: hidden;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.lesson-card:hover {
    transform: translateY(-10px);
    border-color: var(--gold);
}

.card-glow {
    position: absolute;
    top: -50px;
    right: -50px;
    width: 100px;
    height: 100px;
    filter: blur(40px);
    opacity: 0.3;
}

.lesson-id {
    font-size: 0.7rem;
    color: var(--gold);
    font-weight: bold;
    letter-spacing: 1px;
}

.lesson-card h3 {
    font-size: 1.5rem;
    margin: 1rem 0;
    font-weight: 400;
}

.lesson-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    min-height: 3rem;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 2rem;
}

.card-footer span {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.enter-btn {
    background: none;
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: 0.3s;
}

.lesson-card:hover .enter-btn {
    background: var(--gold);
    color: #000;
    border-color: var(--gold);
}

/* --- LESSON PLATFORM TRANSITIONS --- */
#lesson-platform {
    opacity: 1;
    transition: opacity 0.5s ease;
}

#lesson-platform.hidden {
    opacity: 0;
    display: none;
}

.home-btn {
    background: none;
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    margin-right: 1rem;
    font-size: 1.2rem;
}

.home-btn:hover {
    border-color: var(--gold);
    color: var(--gold);
}


.brand h1 {
    font-size: 1.2rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--gold);
}

.brand p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.nav-btn {
    background: none;
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    width: 35px;
    height: 35px;
    border-radius: 50%;
    margin-left: 0.5rem;
    cursor: pointer;
    transition: 0.3s;
}

.nav-btn.active {
    border-color: var(--gold);
    color: var(--gold);
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.3);
}

/* Content */
.page-container {
    max-width: 800px;
    margin: 3rem auto;
    padding: 0 1rem;
    position: relative;
    z-index: 2;
}

.ancora-sup, .ancora-inf {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
    margin: 1.5rem 0;
}

.glass {
    background: var(--card-bg);
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    padding: 2.5rem;
    backdrop-filter: blur(10px);
}

h2.highlight {
    margin: 1.5rem 0;
    font-size: 2rem;
    font-weight: 300;
}

p {
    line-height: 1.8;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

/* Visual Assets */
.visual-container {
    margin: 2rem 0;
}

.svg-placeholder {
    height: 300px;
    background: rgba(0,0,0,0.3);
    border-radius: 15px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px dashed var(--border-glass);
}

.hotspot {
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--gold);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 15px var(--gold);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.3); opacity: 1; }
    100% { transform: scale(1); opacity: 0.8; }
}

.info-panel {
    background: rgba(0,0,0,0.5);
    padding: 1rem;
    border-radius: 10px;
    margin-top: 1rem;
    font-size: 0.9rem;
    border-left: 3px solid var(--gold);
}

.img-real {
    margin-top: 3rem;
    padding: 1rem;
}

.img-meta {
    font-size: 0.7rem;
    letter-spacing: 2px;
    color: var(--gold);
    margin-bottom: 1rem;
}

.img-placeholder {
    height: 200px;
    background: #1c1c1c;
    border-radius: 10px;
    background-image: radial-gradient(circle, #333 1px, transparent 1px);
    background-size: 10px 10px;
}

.caption {
    font-size: 0.8rem;
    margin-top: 1rem;
    color: var(--text-secondary);
}

/* Footer */
.luxury-footer {
    position: fixed;
    bottom: 0;
    width: 100%;
    padding: 1.5rem 2rem;
    background: rgba(13, 17, 23, 0.9);
    border-top: 1px solid var(--border-glass);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
}

footer button {
    background: none;
    border: 1px solid var(--gold);
    color: var(--gold);
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: 0.3s;
}

footer button:disabled {
    border-color: var(--text-secondary);
    color: var(--text-secondary);
    cursor: not-allowed;
}

.progress-bar {
    width: 50%;
    height: 4px;
    background: var(--border-glass);
    border-radius: 2px;
}

.progress-bar .fill {
    width: 14%;
    height: 100%;
    background: var(--gold);
    border-radius: 2px;
}