/* ========================================
   SPATIAL INVERSE — Screen Styles
   ======================================== */

/* --- Title Screen --- */
#title-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(ellipse at 50% 30%, var(--bg-tertiary) 0%, var(--bg-primary) 70%);
    overflow: hidden;
}

.particle-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: var(--z-bg);
}

.particle-bg .particle {
    position: absolute;
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--neon-cyan);
    animation: particleFloat linear infinite;
    opacity: 0.5;
}

.title-content {
    position: relative;
    z-index: var(--z-content);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2xl);
}

.logo-wrapper {
    animation: fadeInUp 0.8s ease;
}

.game-title {
    display: flex;
    flex-direction: column;
    line-height: 1;
    gap: var(--space-xs);
}

.title-line {
    font-family: var(--font-display);
    font-weight: 900;
    letter-spacing: 0.2em;
}

.title-spatial {
    font-size: var(--fs-2xl);
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple), var(--neon-cyan));
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: titleShimmer 4s linear infinite;
}

.title-inverse {
    font-size: var(--fs-3xl);
    color: var(--text-primary);
    text-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
}

.subtitle {
    font-family: var(--font-body);
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    margin-top: var(--space-md);
}

.title-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    animation: fadeInUp 0.8s ease 0.3s backwards;
}

.title-buttons .btn-primary {
    min-width: 220px;
    padding: var(--space-lg) var(--space-2xl);
    font-size: var(--fs-base);
}

.version-tag {
    font-size: var(--fs-xs);
    color: var(--text-muted);
    letter-spacing: 0.1em;
    animation: fadeInUp 0.8s ease 0.5s backwards;
}

/* --- Screen Header (Shared) --- */
.screen-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.screen-title {
    font-family: var(--font-display);
    font-size: var(--fs-lg);
    letter-spacing: 0.1em;
    color: var(--text-primary);
}

.total-stars-display {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-display);
    font-size: var(--fs-sm);
    color: var(--neon-yellow);
}

.star-max {
    color: var(--text-muted);
    font-family: var(--font-body);
    font-size: var(--fs-xs);
}

/* --- World Select --- */
#world-select {
    background: var(--bg-primary);
}

.worlds-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    padding: var(--space-xl);
    overflow-y: auto;
    align-items: center;
}

.world-card {
    width: 100%;
    max-width: 500px;
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.world-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-xl);
    opacity: 0.15;
    transition: opacity var(--transition-normal);
}

.world-card[data-world="1"]::before {
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
}

.world-card[data-world="2"]::before {
    background: linear-gradient(135deg, var(--neon-magenta), var(--neon-orange));
}

.world-card[data-world="3"]::before {
    background: linear-gradient(135deg, var(--neon-purple), var(--neon-red));
}

.world-card:hover::before {
    opacity: 0.25;
}

.world-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.15);
}

.world-card.locked {
    opacity: 0.4;
    cursor: not-allowed;
    filter: grayscale(0.5);
}

.world-card.locked:hover {
    transform: none;
}

.world-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
}

.world-emoji {
    font-size: 2.5rem;
}

.world-lock {
    font-size: 1.5rem;
    opacity: 0.5;
}

.world-name {
    font-family: var(--font-display);
    font-size: var(--fs-lg);
    letter-spacing: 0.05em;
    margin-bottom: var(--space-xs);
}

.world-desc {
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: var(--space-md);
}

.world-progress {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.progress-bar-wrapper {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    border-radius: 3px;
    transition: width var(--transition-slow);
}

.world-card[data-world="1"] .progress-bar-fill {
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
}

.world-card[data-world="2"] .progress-bar-fill {
    background: linear-gradient(90deg, var(--neon-magenta), var(--neon-orange));
}

.world-card[data-world="3"] .progress-bar-fill {
    background: linear-gradient(90deg, var(--neon-purple), var(--neon-red));
}

.world-stars-info {
    font-family: var(--font-display);
    font-size: var(--fs-xs);
    color: var(--neon-yellow);
    white-space: nowrap;
}

/* --- Level Select --- */
#level-select {
    background: var(--bg-primary);
}

.levels-grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--space-lg);
    padding: var(--space-xl);
    overflow-y: auto;
    align-content: start;
}

.level-card {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    border-radius: var(--radius-lg);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
}

.level-card:hover {
    transform: translateY(-3px);
    border-color: var(--neon-cyan);
    box-shadow: 0 8px 30px rgba(0, 240, 255, 0.15);
}

.level-card.locked {
    opacity: 0.3;
    cursor: not-allowed;
}

.level-card.locked:hover {
    transform: none;
    border-color: var(--glass-border);
    box-shadow: none;
}

.level-card.completed {
    border-color: rgba(0, 255, 136, 0.2);
}

.level-number {
    font-family: var(--font-display);
    font-size: var(--fs-xl);
    color: var(--text-primary);
}

.level-card.locked .level-number {
    display: none;
}

.level-lock-icon {
    display: none;
    font-size: var(--fs-xl);
    opacity: 0.4;
}

.level-card.locked .level-lock-icon {
    display: block;
}

.level-name-label {
    font-size: var(--fs-xs);
    color: var(--text-secondary);
    text-align: center;
    max-width: 90%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.level-stars {
    display: flex;
    gap: 2px;
}

.level-stars .star {
    font-size: 0.9rem;
}

/* --- Responsive: Screens --- */
@media (max-width: 600px) {
    .screen-header {
        padding: var(--space-sm) var(--space-md);
    }

    .screen-title {
        font-size: var(--fs-base);
    }

    .title-content {
        gap: var(--space-lg);
        padding: 0 var(--space-md);
    }

    .title-buttons .btn-primary {
        min-width: 180px;
        padding: var(--space-md) var(--space-xl);
    }

    .worlds-container {
        padding: var(--space-md);
        gap: var(--space-md);
    }

    .world-card {
        padding: var(--space-lg);
    }

    .world-emoji {
        font-size: 1.8rem;
    }

    .levels-grid {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
        gap: var(--space-md);
        padding: var(--space-md);
    }

    .level-number {
        font-size: var(--fs-lg);
    }
}

@media (max-width: 380px) {
    .title-content {
        gap: var(--space-md);
    }

    .title-buttons .btn-primary {
        min-width: 160px;
        padding: var(--space-sm) var(--space-lg);
        font-size: var(--fs-sm);
    }

    .worlds-container {
        padding: var(--space-sm);
        gap: var(--space-sm);
    }

    .world-card {
        padding: var(--space-md);
    }

    .world-name {
        font-size: var(--fs-base);
    }

    .levels-grid {
        grid-template-columns: repeat(auto-fill, minmax(75px, 1fr));
        gap: var(--space-sm);
        padding: var(--space-sm);
    }
}