* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    background: #000;
    color: #fff;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    overflow: hidden;
    width: 100vw;
    height: 100vh;
    position: fixed;
    touch-action: none;
}

.viewport {
    width: 100%;
    height: 100%;
    position: relative;
    overflow: hidden;
}

.room {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
}

/* Initial positions - rooms are off-screen */
.room#up {
    transform: translateY(-100%);
}

.room#down {
    transform: translateY(100%);
}

.room#left {
    transform: translateX(-100%);
}

.room#right {
    transform: translateX(100%);
}

.room#hub {
    transform: translate(0, 0);
}

/* Active state - room is visible */
.room.active {
    transform: translate(0, 0);
}

/* When hub is hidden by vertical navigation */
.room#hub.hidden-down {
    transform: translateY(100%);
}

.room#hub.hidden-up {
    transform: translateY(-100%);
}

.room#hub.hidden-left {
    transform: translateX(100%);
}

.room#hub.hidden-right {
    transform: translateX(-100%);
}

/* Hub specific styles */
.name {
    font-size: clamp(1.5rem, 9vw, 4.5rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0.1em;
    padding: 1rem;
    text-transform: lowercase;
    line-height: 1;
}

.letter {
    display: inline-block;
    transition: font-family 0.1s ease;
    width: 0.75em;
    text-align: center;
    flex-shrink: 0;
    vertical-align: baseline;
    line-height: 1;
}

.letter.underscore {
    opacity: 0.5;
}

.nav-hint,
.back-hint {
    position: absolute;
    bottom: 2rem;
    font-size: 0.875rem;
    opacity: 0.5;
    letter-spacing: 0.05em;
    text-transform: lowercase;
    animation: pulse 2s ease-in-out infinite;
}

/* Room content styles */
.room-content {
    text-align: center;
    padding: 2rem;
}

.room-title {
    font-size: clamp(3rem, 15vw, 8rem);
    font-weight: 900;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
    line-height: 0.9;
}

.room-text {
    font-size: clamp(1rem, 4vw, 2rem);
    opacity: 0.7;
    letter-spacing: 0.1em;
    font-weight: 300;
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.7; }
}